Absorbent article for absorbing body liquids and / or feces

Abstract

The present disclosure relates to a disposable absorbent article (1) for absorbing body fluids and / or feces, said absorbent article (1) comprising: a chassis (2), a first side panel (10) and a second side panel (11) attached to the front portion (3) of the chassis (2), and a third side panel (21) and a fourth side panel (22) attached to the back portion (4) of the chassis (2). The absorbent article further comprises at least one first elastic element (15') and at least one second elastic element (16'), each extending along a portion of the side edges of the chassis and each having a central portion (C1, C2) and a straight portion (P1, P2). Each straight portion (P1, P2) is extending between the respective central portion (C1, C2) and the front edge (23). The longitudinal extent of said first elastic element (15') is overlapping with at least a portion of the longitudinal extent of said first side panel (10), at least a first distance (D1), as seen along said longitudinal axis (L), and the longitudinal extent of said second elastic element (16') is overlapping with at least a portion the longitudinal extent of the second side panel (11), at least a second distance (D2) as seen along said longitudinal axis (L).

Description

[0001] ABSORBENT ARTICLE FOR ABSORBING BODY LIQUIDS AND / OR

[0002] FECES

[0003] TECHNICAL FIELD

[0004] The present invention relates to disposable absorbent articles for absorbing body fluids and / or feces. Such absorbent articles are worn in a pant-like fashion and are commonly provided with elastic elements in selected regions, such as leg elastics arranged along leg edges of the hygienic article, and waist elastics arranged along a waist edge of the absorbent article.

[0005] BACKGROUND OF THE INVENTION

[0006] Disposable absorbent articles are commonly produced in a number of predetermined sizes, catering to differently sized people and people of different age. A given size of absorbent article should preferably also be designed to allow a comfortable fit also for varying body shapes and for people on the move or in various body positions. If the fit is too loose, there is an increased risk of leakage of body fluids and / or feces. If the fit is too tight, the absorbent article is not comfortable. Body fluids may for example be urine, vaginal fluids and / or menstrual fluids.

[0007] Furthermore, the absorbent article may be provided with side panels or belt elements comprising fastener elements for closing the absorbent article when putting it on a wearer. Absorbent articles having side panels are usually produced by lengthwise production methods wherein the absorbent articles are produced from continuous webs running in a machine direction which coincides with a length direction of the absorbent articles produced. Continuous leg elastic elements are stretched and fed along with the traveling webs and are intermittently attached in their stretched state between, for example, a topsheet web and a backsheet web by means of adhesive or by ultrasonic welding or heat welding along the portions of the absorbent articles which are to form leg edges in the final absorbent article. Side panels may be attached at a front end and / or at a back end of each precursor absorbent article in the moving web of precursor absorbent articles and are attached, for example, between the topsheet web and the backsheet web by means of adhesive or by ultrasonic welding or heat welding. An object of the present invention is to enable improved sealing against leaks.

[0008] SUMMARY OF THE INVENTION

[0009] According to a first aspect of the present invention, the above-mentioned object is achieved by an absorbent article as defined in claim 1 with alternative embodiments defined in the dependent claims.

[0010] The absorbent article is disposable and is suitable for absorbing body fluid and / or feces. The absorbent article comprises a chassis extending along a longitudinal axis from a front edge at a front portion of the chassis to a back edge at a back portion of the chassis. The chassis further comprises a first side edge and a second side edge, respectively extending between the front and back edges of the chassis, on opposite sides of the chassis with respect to the longitudinal axis.

[0011] The first and second side edges together define an hourglass shape of the chassis such that the chassis has a narrowest width along a transverse axis extending perpendicularly to the longitudinal axis.

[0012] The chassis also comprises a liquid-permeable topsheet, a liquid- impermeable backsheet and an absorbent structure disposed between said topsheet and said backsheet.

[0013] The absorbent article also comprises a first side panel attached to the front portion of the chassis at the first side edge of the chassis, and a second side panel attached to the front portion of the chassis at the second side edge of the chassis. The absorbent article further comprise a third side panel attached to the back portion of the chassis at the first side edge of the chassis, and a fourth side panel attached to the back portion of the chassis at the second side edge of the chassis.

[0014] The third side panel is provided with a first fastening means configured to be attachable to said first side panel or to said backsheet at said front portion of the chassis. The fourth side panel is provided with a second fastening means configured to be attachable to said second side panel or to said backsheet at said front portion of the chassis.

[0015] The absorbent article further comprises at least one first elastic element attached to the chassis, said first elastic element comprising a first central portion extending along a portion of the first side edge. The absorbent article also comprises at least one second elastic element attached to the chassis, said second elastic element comprising a second central portion extending along a portion of the second side edge.

[0016] The first elastic element also comprises a first straight portion extending along the longitudinal axis between the first central portion of the first elastic element and the front edge. The longitudinal extent of said first elastic element overlaps with at least a portion of the longitudinal extent of said first side panel, at least a first distance, as seen along said longitudinal axis. Also, the second elastic element further comprises a second straight portion extending along the longitudinal axis between the second central portion of the second elastic element and the front edge, the longitudinal extent of said second elastic element overlaps with at least a portion of the longitudinal extent of second side panel, at least a second distance, as seen along the longitudinal axis.

[0017] That is, a portion of the longitudinal extent of said first elastic element overlaps with at least a portion of the longitudinal extent of said first side panel and a portion the longitudinal extent of said second elastic element overlaps with at least a portion of the longitudinal extent of second side panel.

[0018] The first straight portion and the second straight portion may extend along a portion of the respective first and second side edge.

[0019] If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements then one or more, or all first elastic elements and / or one or more, or all second elastic elements may overlap with the respective first and second side panels with the respective first and second distances. One or more or all first elastic elements may then each comprise a first straight portion and a first central portion and one or more or all second elastic elements may then each comprise a second straight portion and a second central portion. The term “plurality” is herein to be interpreted as two or more elastic elements.

[0020] The absorbent article is typically worn by a child or adult wearer, with the chassis covering a wearer’s entire pubic region and at least part of the buttocks with the topsheet directed towards the wearer, and with the backsheet facing the wearer’s clothing. The topsheet is sufficiently fluid permeable to allow discharged body liquids, such as urine, to penetrate through the topsheet, wherein the absorbent structure is able to absorb said fluid, thereby mitigating leakage of said body liquid outside the absorbent article. Body fluids may for example be feces, urine, vaginal fluids and / or menstrual fluids.

[0021] The front portion of the absorbent article is intended to be applied over the stomach of the wearer. The back portion of the absorbent article is intended to be applied over the back of the wearer.

[0022] The third side panel and the fourth side panel provided with first and second fastening means respectively are placed at the back portion of the article. The third side panel and the fourth side panel are stretched out and brought forward and fastened on the respective first side panel and second side panel, or to said backsheet, at said front portion of the chassis during use. The front portion of the chassis is consequently also stretched out during use, when the fastening means are attached to the front portion or to the side panels in the front. In order to obtain a good fit of the absorbent article around the waist of the wearer, the absorbent article may be provided with laterally extending elastic elements, such as waist elastic, etc., in which case the third side panel and the fourth side panel are generally applied under tension to activate any laterally extending elastic elements. Also, when the fastening means are fastened to the respective first side panel and second side panel or to said backsheet at said front portion of the chassis during use this will activate the first and second straight portions of the first and second elastic elements at the front and at least a part of the central portion of the first and second elastic elements close to the straight portion.

[0023] The third side panel and the fourth side panel are provided with fastening means such as mechanical fasteners or adhesive fasteners with a fastener element placed on the third and fourth side panel and a mating fastener element or fastener reception area to which the third side panel and the fourth side panel are to be fastened, which is the first side panel, second side panel or the backsheet at said front portion of the chassis.

[0024] If the fastening means is a mechanical fastener it may be a hook-type fastener which is configured for being attached on a reception surface, such as on a surface having multiple loops. The reception surface may be an outer nonwoven layer of the backsheet or the side panels or may be a particular loop material applied to the backsheet in the front of the absorbent article.

[0025] If the fastening means is a hook-type fastener it can be a hook tab or hook patch / strip. A hook patch / strip comprises, for example, a sheet formed base having generally parallel upper and lower surfaces. The lower surface is usually attached, by adhesive, ultrasonic welding or heat sealing / welding or a combination thereof, to the third or fourth side panel. The sheet formed base may have a square shape, rectangle shape, round shape or any other shape.

[0026] On the upper surface, a plurality of discrete fastening elements comprising stems are projecting from said sheet formed base. The stems may be evenly distributed over the whole area or in different zones, for example, stripes, of fastening elements. The stems may for example be hooks which are adapted to be attached to loops. When the fastener, i.e. the area of fastening material, is pressed together or arranged with a loop material, the hooks catch in the loops and the two are fastened to each other. The backsheet or the first and second side panels can act as a loop material.

[0027] As an alternative to hook patch / strip a hook tab can be used. A hook tab may be an elongated tab which at one end comprises an attached portion by which the tab is permanently attached to the third or fourth side panel, and on the opposite end comprises a fastening portion with hooks provided for releasably engaging a loop material on the absorbent article. The fastening portion is usually protruding over the side panels outer edge in the transversal direction.

[0028] A further alternative to a separate hook patch / strip or a hook tab is to have hooks that are integrally formed in the third and fourth side panel. A method for forming integrated hooks is described in WO2010 / 085492.

[0029] The chassis of the absorbent article has an hourglass shape which is formed of the first and second side edges extending between the front edge and the back edge. The first and second side edges may be contoured at least partly in a crotch portion of the chassis. The crotch portion of the chassis is arranged between the front portion and the back portion of the chassis. The crotch portion is herewith defined as the narrow part of the article intended to be worn in the wearer 's crotch between the legs. With contoured is meant that the first and second side edges may be curved or v- shaped so that the chassis gets the hourglass shape. Each first and second side edge forms a part of a leg opening when the absorbent article is in use. The first and second side edges together define the hourglass shape, which has its narrowest width in the transverse direction. The narrowest width is usually in the crotch portion of the chassis. The first and second side edges may be symmetrically arranged about the longitudinal axis.

[0030] With an hourglass shape it is meant that the chassis in the front and back portion, at least partly, is wider than in the crotch portion of the chassis. That is, the absorbent article may be relatively wider at the ends of the article and relatively narrower towards the middle of the product. The design facilitates for the product to form and to close around the wearer, thereby giving a better fit around the legs. The hourglass shape also facilitates for the absorbent article to be correctly positioned in the longitudinal direction as it has a pre-disposed placement, due to the fitting of its shape between the legs of the wearer and the absorbent product.

[0031] The hourglass shape may be a symmetrical or essentially symmetrical shape about the transversal axis. The chassis may be wider at its ends with the same predetermined distance at the front and back portions and narrows towards the middle of the crotch portion in a symmetrical manner. The hourglass shape may also be an asymmetrical hourglass-shape, where the chassis is wider at its ends with the same predetermined distance or different distances at the front and back portions and narrows towards the middle of the crotch portion in a non-symmetrical manner. That is, in the crotch portion of the chassis close to the front portion, each contoured longitudinally extending side edge may comprise a first concave arch-shaped portion having a first radius which transitions to a second arch-shaped portion having a second radius, wherein the first radius is smaller than the second radius. Alternatively, the second radius is smaller than the first radius. Alternatively, instead of two different arch shaped portions it may be three of more archshaped portions.

[0032] The absorbent structure may also have an hourglass-shape which means that the absorbent structure is wider closer to the front portion and the back portion than in the crotch portion of the chassis, in order to provide an efficient fluid absorption while the design facilitates the product to form and to close around the wearer, thereby giving a better fit around the legs.

[0033] The first and second elastic elements are leg elastics, which are adapted to seal the leg openings against the legs of the wearer. The first and second elastic elements may be located symmetrically on either side of the longitudinal axis.

[0034] The first and second elastic elements may at least partly follow the contour of the respective first and second side edges. With following the contour it is meant that the first and the second elastic elements are following the respective first and second side edges with a predetermined transversal distance which is essentially the same over the part that follows the contour. However, the first and second elastic elements may not follow the contour of the first and second side edges.

[0035] The first and second elastic elements may be any suitable leg elastic as known in the art, such as elastic bands, elastic strings or threads, foam, etc.

[0036] Absorbent articles having side panels may be produced in lengthwise production methods wherein the articles are continuously produced from continuous webs running in a machine direction which coincides with the length direction of the articles which are being produced. Continuous elastic elements, which are forming the first and the second elastic elements, are stretched and fed along with the traveling webs and are intermittently attached in their stretched state between a topsheet web or any other suitable web, such as a web forming a barrier member, also called standing gather, and a backsheet web, by means of adhesive, ultrasonic welding or heat welding along the portions of the articles which are to form leg edges in the final absorbent article.

[0037] The side panels may be attached at the front portion and at the back portion of each precursor absorbent article in the moving web of precursor absorbent articles and may be attached between the topsheet web and the backsheet web or between the web forming a barrier and the backsheet web by means of adhesive, ultrasonic welding or heat welding.

[0038] The first elastic element comprises a first central portion extending along a portion of the first side edge. The second elastic element comprises a second central portion extending along a portion of the second side edge. The first central portion of the first elastic element and the second central portion of the second elastic element may extend along at least a portion of the crotch portion of the chassis.

[0039] The first elastic element also comprises a first straight portion extending along the longitudinal axis between the first central portion of the first elastic element and the front edge. The second elastic element also comprises a second straight portion extending along the longitudinal axis between the second central portion of the second elastic element and the front edge. With the first / second straight portion extending “between” the first / second central portion and the front edge is meant that the first / second straight portion is located between the first / second central portion and the front edge. Thus, the first / second straight portion need not extend all the way between the first / second central portion and the front edge. The first straight portion may extend from the first central portion and towards the front edge. The first straight portion may extend directly from the first central portion or via a first connecting portion, for example a first curved connecting portion. The second straight portion may extend from the second central portion and towards the front edge. The second straight portion may extend directly from the second central portion or via a second connecting portion, for example a second curved connecting portion.

[0040] The longitudinal extent of the first elastic element overlaps with at least a portion of the longitudinal extent of the first side panel at least a first distance, as seen along the longitudinal axis. The longitudinal extent of the second elastic element overlaps with at least a portion of the longitudinal extent of the second side panel at least a second distance, as seen along the longitudinal axis.

[0041] The longitudinal extent of an item is its extension as seen along the longitudinal axis, i.e. its projection on the longitudinal axis.

[0042] The above means that the longitudinal extent of the first straight portion of the first elastic element may fully or partly overlap, as seen along the longitudinal axis, with at least a portion of the longitudinal extent of the first side panel. This also includes that the longitudinal extent of the first straight portion and a part of the longitudinal extent of the first central portion and / or a part or the whole first connecting portion of the first elastic element may overlap with the longitudinal extent of the first side panel, as seen along the longitudinal axis. The same applies for the second elastic element. That is, the longitudinal extent of the second straight portion of the second elastic element may fully or partly overlap, as seen along the longitudinal axis, with at least a portion of the longitudinal extent of the second side panel. This also includes that the longitudinal extent of the second straight portion and a part of the longitudinal extent of the second central portion and / or a part or the whole second connecting portion of the second elastic element may overlap with the longitudinal extent of the second side panel, as seen along the longitudinal axis. The first and the second elastic elements may be arranged in an overlapping arrangement in the transversal direction of the product with the respective first and second side portions. In other words, the first and the second elastic elements may be arranged so as to at least partly be superposed with the respective first side portion and second side portion as seen in a thickness direction of the product. In such a case it is preferable that the first and the second elastic elements are arranged between layers forming the backsheet, for example an inner plastic film and an outer nonwoven web, so that the attachments of the side panels to the chassis are not influenced. The first and the second elastic elements may alternatively be arranged so as to be spaced in the transversal direction of the article with the respective first and second side portions. In other words, the first and the second elastic elements may be arranged so as not to be superposed with the respective first and second side portions in a thickness direction of the product. This way the first and the second elastic elements may be arranged between, for example, the topsheet and the backsheet.

[0043] The overlap, as seen along the longitudinal axis, of the longitudinal extent of the first and the second elastic elements with the longitudinal extent of the first and second side panels, respectively, in the front promotes the elastic elements to strain the chassis in a region of the chassis tensioned between the first and second side panels. That is, the front portion and / or a front part of the crotch portion of the chassis is pulled towards the body. This provides improved tightening around a wearer’s legs especially in the front, such that the absorbent article better adapts to body form and movements, thereby reducing risk of leakage of the absorbent article. Without an overlap, an opening between the body and the absorbent article can arise in the front area. The overlap of the elastic elements reduces that risk.

[0044] The absorbent article may comprise a plurality of first and second elastic elements. In such a case the longitudinal extent of all the elastic elements do not have to overlap the longitudinal extent of the respective first and second side panels with the first or second distances, as seen in the longitudinal axis. It is enough that at least one of the first elastic elements and at least one of the second elastic elements are overlapping.

[0045] The topsheet of the absorbent article is suitably sufficiently liquid-permeable to allow discharged body liquids, such as urine, to penetrate through the thickness of the topsheet. Also, the topsheet is manufactured from a material which is compliant and provides a soft feeling to the skin of the wearer.

[0046] The topsheet may be manufactured from various web materials such as woven and nonwoven webs, perforated films, open cell foams, or combinations or laminates of the above-mentioned materials.

[0047] In the context of the present disclosure, a “nonwoven” is a manufactured sheet, web or batt of directionally or randomly orientated fibers, bonded by friction, and / or cohesion and / or adhesion, excluding paper and products which are woven, knitted, tufted, stitch-bonded incorporating binding yarns or filaments, or felted by wet-milling, whether or not additionally needled. The fibers may be of natural or man-made origin and may be staple or continuous filaments or be formed in situ. Commercially available fibers have diameters ranging from less than about 0.001 mm to more than about 0.2 mm and they come in several different forms: short fibers (known as staple, or chopped), continuous single fibers (filaments or monofilaments), untwisted bundles of continuous filaments (tow), and twisted bundles of continuous filaments (yarn). Nonwoven fabrics can be formed by many processes such as melt blowing, spunbonding, solvent spinning, electrospinning, and carding.

[0048] A nonwoven material suitable as a topsheet can be manufactured from synthetic fibers such as polyester or polypropylene, or natural fibers such as cotton fibers. A mix of synthetic and natural fibers may also be used. The nonwoven materials to be used for the topsheet may for example be made of a spunbond, a spunbond / spunbond composite or a spunbond / melt blown composite, such as a SMS (spunbond / melt blown / spunbond), SSMS, SSMMS, SMMS, nonwoven material of polypropylene or bicomponent fibers of polypropylene and polyethylene, or of a combination of such materials. The topsheet may also have elastic properties.

[0049] The topsheet may be hydrophilized in order to improve the tendency for urine to penetrate the topsheet into the underlying structures. Methods for hydrophilizing nonwovens are known and include coating the nonwoven material with a hydrophilic coating, such as by applying a surfactant coating; by applying a hydrophilic monomer composition and a radical polymerization initiator onto the nonwoven followed by initiating a polymerization reaction on the nonwoven; by applying a coating of hydrophilic nanoparticles; or by treating the nonwoven surface with a high energy treatment (corona, plasma).

[0050] A surfactant coating may be obtained for example by applying a surfactant composition to the nonwoven material by any suitable means including spraying, slot coating, kiss roll coating and / or soaking the material in a bath containing the surfactant. The hydrophilization treatment may be performed in-line during assembly of the absorbent article, or may performed separately and the topsheet may then delivered as ready-to-use rolls to the disposable absorbent article manufacturing plant.

[0051] The topsheet material may have a basis weight of from 8 to 25 g / m2, such as from 12 to 17 g / m2. However, the disclosure is not limited to topsheet materials having this basis weight.

[0052] The liquid-impermeable backsheet of the absorbent article may extend beyond the absorbent structure around the periphery of the entire absorbent structure. The backsheet prevents the exudates absorbed by the absorbent structure from soiling other external products that may contact the disposable absorbent hygiene article, such as bedsheets and undergarments. The backsheet may be substantially impermeable to liquids, such as urine.

[0053] The backsheet may be substantially liquid-impermeable but breathable, i.e. gas permeable, implying that air and other gases may pass through the backsheet while the backsheet is substantially impermeable to liquids.

[0054] For the purposes of the present disclosure, any material commonly known for use as a backsheet material may be included in the backsheet, including but not limited to polymeric films, for example films of polyethylene, polypropylene or copolymers of polyethylene or polypropylene, hydrophobized nonwoven materials, liquid-impermeable foams and liquid- impermeable laminates.

[0055] The backsheet may comprise one or more layers of material. For example, the backsheet may comprise a laminate of a liquid-impermeable polymeric film towards the absorbent structure and may further comprise a nonwoven material towards the side of the chassis facing away from the wearer, to provide a textile, soft feeling to the outer surface of the disposable absorbent article.

[0056] It is also contemplated that the backsheet may be made or otherwise include an entirely, or partially, elastic material to give the product a better fit when in use.

[0057] According to one example embodiment, each of the first and the second straight portions extends parallel to the longitudinal axis.

[0058] According to one example embodiment, each of the first and second straight portions has an extension along the longitudinal axis of at least 5mm, preferably 5 to 90 mm, more preferably 20 to 70 mm. According to one example embodiment, each of the first and the second straight portions has a longitudinal extension and a transversal extension, the longitudinal extension being greater than the transversal extension.

[0059] According to one example embodiment, each of the first and the second straight portions forms an angle to the longitudinal axis L being less than 20 degrees, such as less than 10 degrees, or less than 5 degrees.

[0060] According to one example embodiment, the first and second straight portions may each be an end portion of the first and second elastic elements, respectively.

[0061] According to one example embodiment, only the longitudinal extent of each of the first and the second straight portions overlap with the longitudinal extent of the first and second side panels respectively.

[0062] According to one example embodiment, each of the first and the second straight portions is attached to the chassis.

[0063] If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then the first straight portion of one or more or all first elastic elements and / or the second straight portion of one or more or all second elastic elements may be according to the features above relating to the first and second straight portions.

[0064] According to one example embodiment, the first distance is measured parallel to the longitudinal axis from a point where a back edge of the first side panel facing the back portion of the chassis intersects the first side edge of the chassis; and said second distance is measured parallel to the longitudinal axis from a point where a back edge of the second side panel facing the back portion of the chassis intersects the second side edge of the chassis.

[0065] According to one example embodiment, the first distance is larger than 5 mm and smaller than half the length of a longitudinal extent of the first side panel parallel to the longitudinal axis, said longitudinal extent being from a back edge of the first side panel facing the back portion of the chassis, to a front edge of the first side panel facing away from the back portion of the chassis. The second distance is larger than 5 mm and smaller than half the length of a longitudinal extent of the second side panel parallel to the longitudinal axis, said longitudinal extent being from a back edge of the second side panel facing the back portion of the chassis, to a front edge of the second side panel facing away from the back portion of the chassis. This may tighten the product in the front in order to reduce leakage without pulling down the front edge of the absorbent article during use, which may cause the front of the absorbent article to wrinkle. If the front edge is pulled down, the fit may be decreased, since the whole product may risk slipping down during use. It is desired to have the absorbent article close to the body. Wrinkles at the front of the absorbent article are undesired since the elastic elements may not be activated properly and it may also be hard to sufficiently fasten a fastening means on a wrinkled front, for example, if the fastening means are being attached to the backsheet in the front.

[0066] According to one example embodiment, each one of the first and second distances is in the range of 5-40 mm, preferably 10-30 mm. These distances have proven to be sufficient to tighten the product in the front to reduce leakage without pulling down the front edge of the absorbent article during use, which may cause the front of the absorbent article to wrinkle. If the front edge is pulled down, the fit may be decreased, since the whole product may risk slipping down during use. It is desired to have the absorbent article close to the body. Wrinkles at the front of the absorbent article are undesired since the elastic elements may not be activated properly and it may also be hard to sufficiently fasten a fastening means on a wrinkled front, for example, if the fastening means are being attached to the backsheet in the front.

[0067] According to one example embodiment, the first side panel has a longitudinal extent parallel to the longitudinal axis, from a back edge of the first side panel facing the back portion of the chassis, to a front edge of the first side panel facing away from the back portion of the chassis, wherein at least a portion of the first straight portion of the first elastic element extends along the longitudinal extent of the first side panel, thereby forming said overlap where the longitudinal extent of said first elastic element is overlapping with at least a portion of the longitudinal extent of the first side panel, as seen along the longitudinal axis. Also, the second side panel may have a longitudinal extent parallel to the longitudinal axis, from a back edge of the second side panel facing the back portion of the chassis, to a front edge of the second side panel facing away from the back portion of the chassis, wherein at least a portion of the second straight portion of the second elastic element extends along the longitudinal extent of the second side panel, thereby forming said overlap where the longitudinal extent of said second elastic element is overlapping with at least a portion of the longitudinal extent of the second side panel, as seen along the longitudinal axis.

[0068] According to one example embodiment, the first side panel has a longitudinal extent parallel to the longitudinal axis, from a back edge of the first side panel facing the back portion of the chassis, to a front edge of the first side panel facing away from the back portion of the chassis, wherein at least a portion of the first straight portion of the first elastic element extends parallel to the longitudinal extent of the first side panel, thereby forming said overlap where the longitudinal extent of said first elastic element is overlapping with at least a portion of the longitudinal extent of the first side panel as seen along the longitudinal axis. Also, the second side panel has a longitudinal extent parallel to the longitudinal axis, from a back edge of the second side panel facing the back portion of the chassis, to a front edge of the second side panel facing away from the back portion of the chassis, wherein at least a portion of the second straight portion of the second elastic element extends parallel to the longitudinal extent of the second side panel, thereby forming said overlap where the longitudinal extent of said second elastic element is overlapping with at least a portion of the longitudinal extent of the second side panel, as seen along the longitudinal axis.

[0069] According to one example embodiment, said first elastic element is an elastic thread, and said second elastic element is an elastic thread. The term "elastic thread" is intended to mean a thread or a strand which is made of elastic material, such as e.g. natural or synthetic rubber, thermoplastic elastomers, such as thermoplastic polyurethane or styrene block co-polymers or elastane, also referred as to spandex (polyurethane- polyurea copolymer). The elastic thread may be of the elastane type that is available under the trade name "LYCRA", but any suitable elastic thread may be used. The thread may have a linear mass density, dtex, of about 80-800 dtex. The elastic thread is elongated during the production process. It may be elongated from about 30 to about 300% of the initial, non-tensioned original length, for example in the range of 70-250% and specifically in the range of 100-200 % of the initial, non-tensioned original length. The elastic thread may be of a type that is able to tolerate an elongation of at least about 200% without breaking, so that it can be safely used in the production process without risk for breaking. If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements then all first elastic elements and all second elastic elements may be an elastic thread.

[0070] According to one example embodiment the at least one first and second elastic elements are attached to the chassis. They may be fastened by adhesive and / or by welding. If the first and second elastic elements are attached by adhesive, the adhesive may be arranged on the backsheet or on the topsheet or any other web material used in the products to which the elastic elements are being fixed too. For example, the first and second elastic elements may be arranged between two layers forming the backsheet. The adhesive may be slot coated or sprayed. The basis weight of adhesives to fix the first and second elastic elements as whole is preferably in a range of 0.5 to 10.0 g / m2.

[0071] An alternative to spray or slot coating the adhesive to the backsheet or the topsheet the adhesive can be applied to the elastic elements themselves. If the elastic elements are elastic threads then the part of the elastic thread that is being attached is coated with adhesive. In this case a liquid adhesive, such as hot melt adhesive can be used. Various dispensing systems have been developed for applying hot melt adhesive onto the various components. In one example, hot melt adhesive is applied to one or more of thin elastic threads which has been stretch and the threads are then adhered in a stretched state to a flat nonwoven substrate to form an elasticized portion of the disposable absorbent article.

[0072] The liquid adhesives used for coating the threads may be hot melt adhesives, which have thermoplastic properties. Any type of known hot-melt adhesive may be used and the hot melt adhesive may be for example based on ethylene-vinyl-acetate (EVA), polyolefin, polyester and / or polyamide, polyurethane, styrene block copolymer, silicone rubber and / or natural soy protein-based adhesives. The adhesive may be non-toxic. The adhesive may be a styrene block copolymer based hot-melt adhesive.

[0073] A combination of applying adhesive to the elastic elements and between the topsheet or another web facing the body and the backsheet is also possible.

[0074] As an alternative, the first and second elastic elements may be arranged between two layers forming the backsheet, for example an inner plastic sheet and an outer nonwoven web. As an alternative to adhesive, the elastics can be fastened to the materials by ultrasonic welding which entrap the elastic elements. For example, elastic threads are arranged between two material layers. At least two welds are arranged on opposite sides of a thread and the welds fasten the material layers together. The welds have respective proximal surfaces, facing towards the thread. The proximal surfaces of the welds are spaced apart by a distance, less than the diameter of the untensioned thread. Hence, due to the larger diameter when the thread is untensioned the thread is squeezed between the welds and hence entrapped.

[0075] The process for entrapping the thread can be carried out like this: Before creating the welds, the thread is tensioned in its longitudinal direction and positioned between the two material layers. The longitudinal tension of the elastic thread reduces the diameter of the thread from a value D of the untensioned thread to a value less than the distance D. While the thread is in a tensioned state, at least two welds are created between the two material layers and on opposite sides of the thread. After the welds have been made, the thread tension is released, and the elastic thread is going back to its untensioned state where the diameter is larger than the distance between the welds and the thread is hence entrapped.

[0076] If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then all first elastic elements and all second elastic elements may be attached to the chassis by adhesive and / or by welding.

[0077] According to one example embodiment, each of the first and second elastic elements is positioned between the backsheet and the topsheet, or between two sheets of material forming the backsheet, or between the backsheet and a respective barrier member connected to the topsheet for facing a wearer of the absorbent article. The barrier member may for example form side barriers, also called standing gathers. If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then all first elastic elements may be positioned between the same two materials and all second elastic elements may be positioned between the same two materials.

[0078] According to one example embodiment, said absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, each of the first elastic elements comprise a first central portion and a first straight portion, each extending along a portion of the first side edge and said first straight portion extending along the longitudinal axis between the first central portion of the first elastic element and the front edge, and each of the second elastic elements comprise a second central portion and a second straight portion, each extending along a portion of the second side edge and said second straight portion extending along the longitudinal axis between the second central portion of the second elastic element and the front edge.

[0079] According to one example embodiment, at least two of the first straight portions of the plurality of first elastic elements are straight and parallel to each other; and at least two of the second straight portions of the plurality of second elastic elements are straight and parallel to each other.

[0080] According to one example embodiment, each of the first straight portions of the plurality of first elastic elements is straight and parallel to each other; and each of the second straight portions of the plurality of second elastic elements is straight and parallel to each other.

[0081] According to one example embodiment, a transversal spacing between the first elastic elements, at the first straight portions, is 0.5-15 mm, preferably 0.5-6 mm, more preferably 0.5-4 mm, and a transversal spacing between the second elastic elements, at the second straight portions, is 0.5-15 mm, preferably 0.5-6 mm, more preferably 0.5-4 mm. The transversal spacing is to be understood as the distance between two next to each other arranged elastic elements. The advantage by having the elastic elements at this distance, i.e. between two next to each other arranged elastic elements, at the straight portions is that the elastics elements are close together and will work as one larger elastic member and hence the forces are better distributed in that area.

[0082] According to one example embodiment, a transversal spacing between the first elastic elements increases from a smaller spacing closer to the first straight portions to a larger spacing further away from the first straight portions, wherein a transversal spacing between the second elastic elements increases from a smaller spacing closer to the second straight portions to a larger distance further away from the second straight portions. That is, the transversal spacing being greater in the central portions than in the respective straight portions. The advantage by having the elastic elements at a larger distance in the central portions than in the respective straight portion is that the elastics elements are distributed over a larger area in the transversal direction and form a leg cuff which can be soft and comfortable for the wearer and at the same time give sufficient leakage protection.

[0083] According to one example embodiment, the largest transversal spacing between the first elastic elements at the first central portion, is in the range of 0.5-15 mm, preferably 0.5-10 mm, more preferably 0.5-8 mm. The largest transversal spacing between the second elastic elements at the second central portion is in the range of 0.5-15 mm, preferably 0.5-10 mm, more preferably 0.5-8 mm.

[0084] According to one example embodiment, said first straight portion extends along the longitudinal axis from the first central portion of the first elastic element towards the front edge and said second straight portion extends along the longitudinal axis from the second central portion of the second elastic element towards the front edge. According to one example embodiment, each first and second central portions is curved. If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then each first and second central portions of one or more or all first elastic elements and one or more or all second elastic elements may be curved. They may be curved with the same or with different radius.

[0085] According to one example embodiment, the first central portion of the first elastic element, is curved such that a direction of curvature of an end of the first central portion, at a transition between the first central portion and the first straight portion, follows a first imaginary line extending at a first angle to the longitudinal axis within a range of 10-50 degrees, preferably 20-40 degrees and the second central portion of the second elastic element, is curved such that a direction of curvature of an end of the second central portion, at a transition between the second central portion and the second straight portion, follows a second imaginary line extending at a second angle to the longitudinal axis within a range of 10-50 degrees, preferably 20-40 degrees. By having the end of each curved portion following an imaginary line extending at an angle to the longitudinal axis within the above range, the elastic threads in the curved portion, at least in the area close to the front portion, will be properly activated when being pulled and stretched out, when the products are being arranged on a wearer. Le. when the third side panel and the fourth side panel are stretched out and brought forward and fastened onto the respective first side panel and second side panel or to said backsheet at said front portion, the front of the absorbent article will be stretched out, and hence the elastic threads will be stretched. This is especially the case when the third side panel is attached to the first front panel and the fourth side panel is attached to the second side panel. If the absorbent article comprises a plurality of first elastic elements, each first central portion of each first elastic element may follow the imaginary line extending at a respective angle to the longitudinal axis within a range of I Q- 50 degrees, preferably 20-40 degrees. If the absorbent article comprises a plurality of second elastic elements, then each second central portion of each second elastic element may follow the imaginary line extending at a respective angle to the longitudinal axis within a range of 10-50 degrees, preferably 20-40 degrees.

[0086] According to one example embodiment, the first central portion of the first elastic element is curved such that a direction of curvature of an end of the first central portion at a transition between the first central portion and the first straight portion follows a first imaginary line intersecting a portion of the first side edge of the chassis where the first side panel is attached to the chassis and the second central portion of the second elastic element is curved such that a direction of curvature of an end of the second central portion at a transition between the second central portion and the second straight portion follows a second imaginary line intersecting a portion of the second side edge of the chassis where the second side panel is attached to the chassis. This increases the possibility for the central portion to be sufficiently stretched when the absorbent article is being arranged on a wearer, i.e. when the third side panel and the fourth side panel are stretched out and brought forward and fastened onto the respective first side panel and second side panel or to said backsheet at said front portion of the chassis during use. That is, the third side panel and the fourth side panel are generally applied under tension to activate any laterally extending elastic elements, such as waist elastic, side panel elastic, etc. if there are any, but they will also activate the first and the second straight portions and the first and second central portions of the respective first and second elastic elements. If the absorbent article comprises a plurality of first elastic elements, each first central portion of each first elastic element may follow the imaginary line intersecting a portion of the first side edge of the chassis, where the first side panel is attached to the chassis. If the absorbent article comprises a plurality of second elastic elements, then each second central portion of each second elastic element may follow the imaginary line intersecting a portion of the second side edge of the chassis, where the second side panel is attached to the chassis.

[0087] Preferably, each imaginary line crosses the respective side edge of the chassis (where each side panel is attached to the chassis) in the middle region of the respective side panel in the longitudinal direction.

[0088] According to one example embodiment, said first elastic element comprises a first connecting portion, which is arranged between said first straight portion and said first central portion and said second elastic element comprises a second connecting portion, which is arranged between said second straight portion and said second central portion.

[0089] According to one example embodiment, said first connecting portion is a first curved connecting portion and said second connecting portion is a second curved connecting portion.

[0090] According to one example embodiment, the first central portion of the first elastic element is curved such that a direction of curvature of an end of the first central portion at a transition between the first central portion and the first connecting portion follows a first imaginary line intersecting a portion of the first side edge of the chassis, where the first side panel is attached to the chassis and the second central portion of the second elastic element is curved such that a direction of curvature of an end of the second central portion at a transition between the second central portion and the second connecting portion follows a second imaginary line intersecting a portion of the second side edge of the chassis, where the second side panel is attached to the chassis. This increases the possibility for the central portion to be sufficiently stretched when the absorbent article is being arranged on a wearer. According to one example embodiment, a portion of the longitudinal extent of the respective first and second central portions overlaps with a portion of the longitudinal extent of the first side panel or the second side panel as seen along said longitudinal axis, respectively. Hence, the total distance of the overlap of the respective first and second straight portions and of the respective first or second central portions is the respective first and second distances. For example the first and the second distances may be in the range of 5-40 mm, preferably 10-30 mm. If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then this is applicable for one or more or all first elastic elements and one or more or all second elastic elements.

[0091] According to one example embodiment, each one of the first, second, third and fourth side panels extends laterally, with respect to the longitudinal axis, a respective distance away from the chassis in the range of 50-400mm from the respective first or second side edges of the chassis, where the respective side panel is attached to the chassis.

[0092] According to one example embodiment, each one of the first, second, third and fourth side panels extends a distance in the range of 100-300 mm along the longitudinal axis.

[0093] According to one example embodiment, the first, second, third, and / or fourth side panels are rectangular. The advantage of having rectangular side panels is that there will be no waste material and the production method may be easier. Alternatively, the side panels may have any other suitable shape known in the art. However, preferably no material shall be cut off after the side panels have been attached to the chassis. This reduces waste materials and further manufacturing steps.

[0094] According to one example embodiment, the third side panel and the fourth side panel are elastic side panels. The elasticity allows the third and the fourth side panel to stretch at least in a direction perpendicular to the longitudinal axis. The elasticity may be provided by any suitable design of the respective side panel, such as by using one elastic material for the whole side panel, or by combining pieces of material with different elastic properties. The advantage of having elastics in the side panels in the back of the absorbent article is that the article adapts easier to the body, both when the person using the article is being still and when moving. It also improves the ability of the absorbent article to adapt to different body shapes. Elastic side panels in the back also increase the product’s ability to stay in place during use and enhance comfort in most situations. They also make the absorbent product more forgiving when applying the product on a wearer.

[0095] According to one example embodiment, the first side edge comprises a curved portion between the first side panel and the third side panel. Also, the second side edge comprises a curved portion between the second side panel and the fourth side panel. The curved portion may extend over the whole crotch portion of the chassis or only part of the crotch portion of the chassis.

[0096] According to one example embodiment, the first elastic element further comprises a third straight portion extending along the longitudinal axis between the first central portion of the first elastic element and the back edge of the chassis. The longitudinal extent of the first elastic element overlaps with at least a portion of the longitudinal extent of the third side panel, at least a third distance, as seen along said longitudinal axis. Also, the at least one second elastic element further comprises a fourth straight portion extending along the longitudinal axis between the second central portion of the at least one second elastic element and the back edge of the chassis. The longitudinal extent of the second elastic element longitudinally overlaps with at least a portion of the longitudinal extent of the fourth side panel, at least a fourth distance, as seen along said longitudinal axis. That is, a portion of the longitudinal extent of said first elastic element overlaps with at least a portion of the longitudinal extent of said third side panel and a portion the longitudinal extent of said second elastic element overlaps with at least a portion of the longitudinal extent of fourth side panel.

[0097] This promotes the elastic elements to strain the chassis from a region of the chassis tensioned between the third and fourth side panels. That is, at least the back portion and / or a back part of the crotch portion of the chassis is pulled towards the body. This provides improved tightening around a wearer’s legs especially in the back, such that the absorbent article better adapts to body form and movements, thereby reducing risk of leakage from the absorbent article in the back. Without an overlap, an opening between the body and the absorbent product can arise in the back. The overlap of the elastic elements reduces that risk. If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then one or more or all third elastic elements and / or one or more or all fourth elastic elements may overlap with the respective third and / or fourth side panel with the respective third distance and fourth distance. One or more or all first elastic elements may then each comprise a third straight portion, and one or more or all second elastic elements may then each comprise a fourth straight portion.

[0098] By having the longitudinal extent of the first elastic element overlapping with at least a portion of the longitudinal extent of the third side panel by a third distance, and the longitudinal extent of the second elastic element overlapping with at least a portion of the longitudinal extent of the fourth side panel by a fourth distance (as seen along the longitudinal axis), the longitudinal extent of the third straight portion of the first elastic element may fully or partly overlap with at least a portion of the longitudinal extent of the third side panel. This also includes that the longitudinal extent of the third straight portion and a part of said the longitudinal extent of the first central portion of the first elastic element may overlap with the longitudinal extent of the third side panel. The same applies for the second elastic element. That is, that the longitudinal extent of the fourth straight portion of the second elastic element may fully or partly overlap with at least a portion of the longitudinal extent of the fourth side panel, as seen along the longitudinal axis. This also includes that the longitudinal extent of the fourth straight portion and a part of the longitudinal extent of the second central portion of the second elastic element may overlap with the longitudinal extent of the fourth side panel.

[0099] With the third / fourth straight portion extending “between” the first / second central portion and the back edge is meant that the third / fourth straight portion is located between the first / second central portion and the back edge. Thus, the third / fourth straight portion need not extend all the way between the first / second central portion and the back edge.

[0100] According to one example embodiment, said third straight portion extends along the longitudinal axis from the first central portion of the first elastic element towards the back edge and said fourth straight portion extends along the longitudinal axis from the second central portion of the second elastic element towards the back edge.

[0101] The third straight portion may extend directly from the first central portion or via a third connecting portion, for example a third curved connecting portion. The fourth straight portion may extend directly from the second central portion or via a fourth connecting portion, for example a second curved connecting portion.

[0102] The first elastic element and the second elastic element may be arranged in an overlapping arrangement in the transversal direction of the product with the respective third and fourth side portion. In other words, the first elastic element and the second elastic element may be arranged so as to at least partly be superposed with the respective third and fourth side portion, as seen in a thickness direction of the product. In such a case, it is preferable that the first and the second elastic elements are arranged between layers forming the backsheet, for example between an inner plastic film and an outer nonwoven web, so that the attachment of the side panels to the chassis is not influenced. The first elastic element and the second elastic element may alternatively be arranged so as to be spaced in the transversal direction of the product with the respective third and fourth side portion. In other words, the first elastic element and the second elastic element may be arranged so as not to be superposed in a thickness direction of the product with the respective third and fourth side portion. This way, the first and the second elastic elements may, for example, be arranged between, for example, the topsheet and the backsheet, or a barrier member and the backsheet.

[0103] According to one example embodiment, in the first elastic element, the first central portion is arranged between the first straight portion and the third straight portion in the longitudinal direction, and in the second elastic element, the second central portion is arranged between the second straight portion and the fourth straight portion in the longitudinal direction. If the absorbent article comprises a plurality of first and second elastic elements this arrangement applies also to each of the first and second elastic elements.

[0104] According to one example embodiment, each of the third and the fourth straight portions extends parallel to the longitudinal axis.

[0105] According to one example embodiment, each of the third and the fourth straight portions has an extension along the longitudinal axis of at least 5 mm, preferably 5 to 130 mm, more preferably 30-100mm. According to one example embodiment, each of the third and the fourth straight portions has a longitudinal extension and a transversal extension, the longitudinal extension being greater than the transversal extension.

[0106] According to one example embodiment, each of the third and the fourth straight portions form an angle to the longitudinal axis being less than 20 degrees, such as less than 10 degrees, or less than 5 degrees.

[0107] According to one example embodiment, the third and the fourth straight portions may each be an end portion of the first and second elastic elements, respectively.

[0108] According to one example embodiment, only the longitudinal extent of each of the third and the fourth straight portions overlap with the longitudinal extent of the third and the fourth side panel respectively.

[0109] According to one example embodiment, each of the third and the fourth straight portions is attached to the chassis.

[0110] According to one example embodiment, each of the first and the second central portions is attached to the chassis.

[0111] If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then the third straight portion of one or more or all first elastic elements and / or the fourth straight portion of one or more or all second elastic elements may be according to the features above relating to the third and the fourth straight portions.

[0112] According to one example embodiment, the third distance is measured parallel to the longitudinal axis from a point where a front edge of the third side panel facing the front portion of the chassis intersects the first side edge of the chassis, and said fourth distance is measured parallel to the longitudinal axis from a point where a front edge of the fourth side panel facing the front portion of the chassis intersects the second side edge the chassis.

[0113] According to one example embodiment, the third distance is larger than 5 mm and smaller than half the length of a longitudinal extent of the third side panel parallel to the longitudinal axis, said extent being from a front edge of the third side panel facing the front portion of the chassis, to a back edge of the third side panel facing away from the front portion of the chassis. Further, the fourth distance is larger than 5 mm and smaller than half the length of a longitudinal extent of the fourth side panel parallel to the longitudinal axis, from a front edge of the fourth side panel facing the front portion of the chassis, to a back edge of the fourth side panel facing away from the front portion of the chassis. This has proven to be sufficient to tighten the product in the back to reduce leakage without pulling down the back edge of the absorbent article during use, which may cause the back of the absorbent article to wrinkle. If the back edge is pulled down, the fit may be decreased, since the whole product may risk slipping down during use. It is desired to have the absorbent article close to the body.

[0114] According to one example embodiment, each one of the third and fourth distances is in the range of 5-40 mm, preferably 10-30 mm. These distances have proven to be sufficient to tighten the product in the back to reduce leakage without pulling down the back edge of the absorbent article during use, which may cause the back of the absorbent article to wrinkle. If the back edge is pulled down, the fit may be decreased, since the whole product may risk slipping down during use. It is desired to have the absorbent article close to the body.

[0115] According to one example embodiment, the third side panel has a longitudinal extent parallel to the longitudinal axis, from a front edge of the third side panel facing the front portion of the chassis, to a back edge of the third side panel facing away from the front portion of the chassis, wherein at least a portion of the third straight portion of the first elastic element extends along the longitudinal extent of the third side panel, thereby forming said overlap where the longitudinal extent of said first elastic element is overlapping with at least a portion of the longitudinal extent of the third side panel as seen along said longitudinal axis. Also, the fourth side panel has a longitudinal extent parallel to the longitudinal axis, from a front edge of the fourth side panel facing the front portion of the chassis, to a back edge of the fourth side panel facing away from the front portion of the chassis, wherein at least a portion of the fourth straight portion of the second elastic element extends along to the longitudinal extent of the second side panel, thereby forming the overlap where the longitudinal extent of said second elastic element is overlapping with at least a portion of the longitudinal extent of the fourth side panel as seen along said longitudinal axis.

[0116] According to one example embodiment, the third side panel has a longitudinal extent parallel to the longitudinal axis, from a front edge of the third side panel facing the front portion of the chassis, to a back edge of the third side panel facing away from the front portion of the chassis, wherein at least a portion of the third straight portion of the third elastic element extends parallel to the longitudinal extent of the third side panel, thereby forming an overlap where the longitudinal extent of said first elastic element is overlapping with at least a portion of the longitudinal extent of the third side panel, as seen along said longitudinal axis. Also, the fourth side panel has a longitudinal extent parallel to the longitudinal axis, from a front edge of the fourth side panel facing the front portion of the chassis, to a back edge of the fourth side panel facing away from the front portion of the chassis, wherein at least a portion of the fourth straight portion of the second elastic element extends parallel to the longitudinal extent of the fourth side panel, thereby forming an overlap where the longitudinal extent of said second elastic element is overlapping with at least a portion of the longitudinal extent of the fourth side panel, as seen along said longitudinal axis. According to one example embodiment, a portion of the longitudinal extent of the respective first or second central portions overlaps a portion of the longitudinal extent of the third side panel or the fourth side panel as seen along said longitudinal axis, respectively. Hence, the total distance of the overlap of the respective third or fourth straight portions and of the respective first or second central portions is the respective third and fourth distances. For example the third and fourth distances may be the range of 5-40 mm, preferably 10-30 mm. If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements then this is applicable for one or more, or all first elastic elements and one or more, or all second elastic elements.

[0117] According to one example embodiment, said absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, each of the first elastic elements comprise a first central portion and a third straight portion, both extending along a portion of the first side edge and said third straight portion extending along the longitudinal axis between the first central portion of the first elastic element and the back edge, and each second elastic elements comprise a second central portion and a fourth straight portion, both extending along a portion of the second side edge and said fourth straight portion extending along the longitudinal axis between the second central portion of the second elastic element and the back edge.

[0118] According to one example embodiment, at least two of the third straight portions of the plurality of first elastic elements are straight and parallel to each other; and at least two of the fourth straight portions of the plurality of second elastic elements are straight and parallel to each other.

[0119] According to one example embodiment, each of the third straight portions of the plurality of first elastic elements is straight and parallel to each other; and each of the fourth straight portions of the plurality of second elastic elements is straight and parallel to each other.

[0120] According to one example embodiment, said absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, and each first elastic element comprises a first central portion and a third straight portion, both extending along a portion of the first side edge and said third straight portion extending along the longitudinal axis from the first central portion of the first elastic element towards the back edge, and each second elastic element comprises a second central portion and a fourth straight portion, both extending along a portion of the second side edge and said fourth straight portion extending along the longitudinal axis from the second central portion of the second elastic element towards the back edge, wherein a transversal spacing between the first elastic elements, at the third straight portions, is 0.5-15 mm, preferably 0.5-6 mm, more preferably 0.5-4 mm, and a transversal spacing between the second elastic threads, at the fourth straight portions, is 0.5-15 mm, preferably 0.5-6 mm, more preferably 0.5-4 mm. The advantage by having the elastic threads at this distance in the straight portions is that the elastics elements are close together and will work as one larger elastic member and the forces are better distributed in that area.

[0121] According to one example embodiment, a transversal spacing between the first elastic elements increases from a smaller spacing closer to the third straight portions to a larger spacing further away from the third straight portions and a transversal spacing between the second elastic elements increases from a smaller spacing closer to the fourth straight portions to a larger spacing further away from the fourth straight portions. The advantage by having the elastic elements at a larger spacing in the central portion than in the straight portion is that the elastics elements are distributed over a larger area in the transversal direction and forms a leg cuff which can be soft and comfortable for the wearer and at the same time give sufficient leakage protection.

[0122] According to one example embodiment, said third straight portion extends along the longitudinal axis from the first central portion of the first elastic element towards the back edge and said fourth straight portion extends along the longitudinal axis from the second central portion of the second elastic element towards the back edge.

[0123] According to one example embodiment, the first central portion of the first elastic element is curved such that a direction of curvature of an end of the first central portion at a transition between the first central portion and the third straight portion follows a third imaginary line extending at a third angle to the longitudinal axis within a range of 10-50 degrees, preferably 20-40 degrees and the second central portion of the second elastic element is curved such that a direction of curvature of an end of the second central portion at a transition between the second central portion and the fourth straight portion follows a fourth imaginary line extending at a fourth angle to the longitudinal axis within a range of 10-50 degrees, preferably 20-40 degrees. By having the end of each curved portion following an imaginary line extending at an angle to the longitudinal axis within the above range, the elastic elements in the curved portion, at least in the area close to the back portion, will be properly activated when being pulled and stretched out, when the products are being arranged on a wearer. Le. when the third side panel and the fourth side panel are stretched out and brought forward and fastened on to the respective first side panel and second side panel, or to said backsheet at said front portion. If the absorbent article comprises a plurality of first elastic elements, each first central portion of each first elastic element may follow the imaginary line extending at a respective angle to the longitudinal axis within a range of 10-50 degrees, preferably 20-40 degrees. If the absorbent article comprises a plurality of second elastic elements, then each second central portion of each second elastic element may follow the imaginary line extending at a respective angle to the longitudinal axis within a range of 10-50 degrees, preferably 20-40 degrees.

[0124] According to one example embodiment, the first central portion of the first elastic element is curved such that a direction of curvature of an end of the first central portion at a transition between the first central portion and the third straight portion follows a third imaginary line intersecting a portion of the first side edge of the chassis where the third side panel is attached to the chassis and the second central portion of the second elastic element is curved such that a direction of curvature of an end of the second central portion at a transition between the second central portion and the fourth straight portion follows a fourth imaginary line intersecting a portion of the second side edge of the chassis where the fourth side panel is attached to the chassis. This increases the possibility for the central portion in the back to be sufficiently stretched when an absorbent article is being arranged on a wearer, i.e. when the third side panel and the fourth side panel are stretched out and brought forward and fastened on to the respective first side panel and second side panel, or to said backsheet, at said front portion of the chassis during use. That is, the third side panel and the fourth side panel are generally applied under tension to activate any laterally extending elastic elements, such as waist elastic, side panel elastic, etc. if there are any, but they will also activate the third and the fourth straight portions and the first and the second central portions in the back of the first and second elastic elements. If the absorbent article comprises a plurality of first elastic elements, each first central portion of each first elastic element may follow the imaginary line intersecting a portion the first side edge of the chassis where the third side panel is attached to the chassis. If the absorbent article comprises a plurality of second elastic elements, then each second central portion of each second elastic element may follow the imaginary line intersecting a portion of the second side edge of the chassis, where the fourth side panel is attached to the chassis. Preferably, the imaginary line crosses the respective side edge of the chassis where each third or fourth side panel is attached to the chassis in the middle region of the respective side panel, as seen in the longitudinal direction.

[0125] According to one example embodiment, said first elastic element comprises a third connecting portion, which is arranged between said third straight portion and said first central portion and said second elastic element comprises a fourth connecting portion, which is arranged between said fourth straight portion and said second central portion.

[0126] According to one example embodiment, said third connecting portion is a first curved connecting portion and said fourth connecting portion is a fourth curved connecting portion.

[0127] According to one example embodiment, the first central portion of the first elastic element is curved such that a direction of curvature of an end of the first central portion at a transition between the first central portion and the third connecting portion follows an imaginary line intersecting a portion of the first side edge of the chassis, where the third side panel is attached to the chassis and, the second central portion of the second elastic element is curved such that a direction of curvature of an end of the second central portion at a transition between the second central portion and the fourth connecting portion follows an imaginary line intersecting a portion of the second side edge of the chassis, where the third side panel is attached to the chassis. This increases the possibility for the central portion to be sufficiently stretched when the absorbent article is being arranged on a wearer.

[0128] According to one example embodiment, a portion of the longitudinal extent of the respective first and second central portions overlap with a portion of the longitudinal extent of the third side panel or the fourth side panel as seen along said longitudinal axis, respectively, along a distance along said longitudinal axis, wherein a total distance of the overlap of the respective third and fourth straight portion and of the respective first or second central portion is in the range of 5-40 mm, preferably 10-30 mm. If the absorbent article comprises a plurality of first elastic elements and a plurality of second elastic elements, then this is applicable for one or more or all first elastic elements and one or more or all second elastic elements.

[0129] According to one example embodiment, each one of the third and fourth side panels comprise an inner panel member being attached to the chassis, an outer panel member, and an elastic panel member, said elastic panel member being arranged between and attached to said inner panel member and said outer panel member, wherein said elastic member is attached to said inner panel member at a first fastening region and to said outer panel member at a second fastening region. The elastic panel member has a length along the longitudinal axis, and said elastic panel member comprises an intermediate portion extending between the first and the second fastening region. The intermediate portion has a width along the transversal axis in the range of 5 to 20 mm. The elastic panel member may have a size that ensures it to work sufficiently while at the same time it shall be as small as possible in order to be cost efficient. It is also beneficial from a sustainability perspective to have a small elastic panel member. Hence, the intermediate portion of the elastic panel member shall have a width along the transversal axis in the range of 5 to 20 mm.

[0130] The terms “inner panel member” and “outer panel member” as used herein refer to the transversal location of the panel members. As such, each inner panel member is located transversally closer to the longitudinal axis than the respective outer panel member.

[0131] According to one example embodiment, the elastic panel member comprises a sheet material having a first load at 120%, which is in the range of 2-6 N, preferable 2-4N measured according to the method disclosed herein. This ensures that it is easy to activate the elastic panel member when applying the absorbent article to the wearer. It is desirable that the elastic panel member is easy to activate because you do not want to pull too much on the product when applying it since it may then be uncomfortable for the wearer. If a higher force is needed to activate the elastic panel member it might be the case that the elastic panel member needs to be activated before it is applied to the wearer, i.e. after it is removed from the package or taken from a shelf, for example in a nursing home, and before it is being applied to a wearer. The caregiver maybe does not have the knowledge and / or time to do it and this can lead to the absorbent product is not properly fastened on the body of the wearer and may cause leakage, and in a worst-case scenario fall down.

[0132] According to one example embodiment, the sheet material of the elastic panel member has a second unload at 75%, which is greater than 1 .2 N, and a second unload at 50%, which is greater than 0.8N measured according to the method disclosed herein. This improves that the absorbent product is sufficiently held on the body of the wearer. The absorbent product needs to have a certain force within the sheet material of the elastic panel member to stay on the body.

[0133] According to one example embodiment, the intermediate portion of the elastic panel member is positioned at a distance of maximum 2 / 3 of the respective third and fourth side panel length, in a direction along the transversal axis, from the respective first or second side edge of the chassis, where the inner panel member is attached to the chassis. It may be advantageous that the elastic panel member is not arranged too close to the fastening means, because then the effect of the elastic may be lost. Most of the movements will occur in the front half of the circumference of the body. However, when the third and the fourth side panels are positioned on top of the respective first and second side panels, there may be friction between the parts, so if the elastic panel members are overlapping the first or the second side panels or the backsheet in the front, the elasticity in the elastic side panel member may be locked or reduced by the friction between the parts. According to one example embodiment, the intermediate portion of the elastic panel member is positioned at a distance of least 20 mm from the respective first or second side edge of the chassis, where the inner panel member is attached to the chassis, in a direction along the transversal axis. It is advantageous that the elastic panel member is arranged not to close to the first or second side edges. If they are, the elastic risks not efficiently taking care of and compensating for the movements of the body. Not having the elastic panel members too close to side edges also allows for the person putting on the absorbent article on the wearer to see if they have activated the elastic panel member. Further, it also limits the risk that the wearer lies on the elastic panel member and hence locks the elastic in the elastic panel member. It may be advantageous that the elastic panel member is placed on the side of the hip of the body in order to adjust to the movement from the stomach while a wearer is changing position between laying down, sitting and standing and leg movements. If the elastic panel member is too close to the back the wearer risk laying on it and lock the elastic panel member.

[0134] According to one example embodiment, the elastic panel member is attached to said inner panel member at said first fastening region in a first overlapping area, and to said outer panel member at said second fastening region in a second overlapping area, and said elastic panel member having a width along the transversal axis shorter than 40 mm, said width extending over said intermediate portion and said first and second overlapping areas. It is both cost effective and environment friendly to have short elastic panel member, compared to longer elastic panel members.

[0135] The first and second overlapping areas are areas as seen in a plane spanned by the transversal and longitudinal axis. In the first / second overlapping area, a portion of the inner / outer panel member is arranged in a superposed relationship as seen in a thickness direction with the elastic panel member. According to one example embodiment, the elastic panel member is attached at said first fastening region to said inner panel member by adhesive, thermobonding or welding and / or the elastic panel member is attached at said second fastening region to the outer panel member by adhesive, thermobonding or welding.

[0136] According to one example embodiment, the elastic panel member comprises a sheet material, and the sheet material is an elastic laminate formed by an elastic film layer arranged between two fibrous materials, for example nonwoven layers. Examples of elastic laminates suitable for forming the elastic panel members are any elastic laminate known in the art. One group of elastic laminates are so called "stretch-bonded" laminates, in which the elastic layer is stretched in at least one direction before laminating it with one or more inelastic layers. After the tension is removed from the elastic layer it can freely retract to its untensioned state, and the inelastic layer(s) laminated thereto become gathered, giving a three-dimensional puckering.

[0137] Another group of elastic laminates are so called "neck bonded" laminates, which refer to laminates in which an elastic material is bonded to a nonelastic material while the non-elastic member is extended under conditions reducing its width or necked. "Neck bonded laminate" refers to a composite material having at least two layers, in which one layer is a necked, nonelastic layer and the other layer is an elastic layer. The layers are joined together when the non-elastic layer is in an extended condition.

[0138] A further group of elastic laminates are inelastic nonwoven layers laminated to an elastic film layer, and the laminate is stretched above the point of failure of the nonwoven materials, so that the inelastic layers break. Alternatively, the elastic panel member comprises one or more elastic threads or strips contractably affixed between web material layers, such as non-woven layers.

[0139] Alternatively, the sheet material of the elastic panel member may be an elastic film, or an elastic nonwoven.

[0140] BRIEF DESCRIPTION OF DRAWINGS

[0141] The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non-limiting detailed description of exemplary embodiments of the present invention, with reference to the appended drawings, where same reference numerals may be omitted in some figures for similar elements, wherein:

[0142] Fig. 1 shows a schematic view of an absorbent article according to a first embodiment, when stretched to extend essentially planarly, i.e. with the elastic elements stretched.

[0143] Fig. 2 shows a schematic cross-sectional view in a plane along section line A-A shown in Fig. 1 .

[0144] Fig. 3 shows a schematic view of the chassis in Fig. 1 with the first and second side edges, and a plurality of first elastic elements with their first straight portions, third straight portions and first central portions encircled by broken lines to show their extent, and a plurality of the second elastic elements with their second straight portions, fourth straight portions and second central portions encircled by broken lines to show their extent.

[0145] Fig. 4 shows a schematic view of the second side panel in Fig. 1 with an alternative configuration of the plurality of the second elastic elements, where the longitudinal extent of the second straight portions and part of the longitudinal extent of the second central portions C2 of the respective second elastic elements each overlap the longitudinal extent of the second side panel, as seen along the longitudinal axis.

[0146] Fig. 5 shows a schematic view of an alternative shape of the second side panel.

[0147] Fig. 6 shows a schematic view of the first side panel and its attachment to the chassis, and a part of the attachment of the first elastic elements to the chassis.

[0148] Fig. 7a and 7b show the third side panel in Fig. 1 in more detail. Fig. 7b shows the cross-section B-B in Fig. 7a.

[0149] Fig. 8 shows a schematic view of the fourth side panel shown in Fig.1 with alternative fastening members.

[0150] Fig. 9 shows a schematic view of the second side panel in Fig 1 and part of the chassis and the second elastic elements, except with an alternative configuration of the second elastic elements where a curved connection portion is arranged between each of the second straight portions and the respective second central portion.

[0151] All the figures are schematic, not necessarily drawn to scale, and they show features necessary to elucidate the invention, other features being omitted or merely suggested.

[0152] DETAILED DESCRIPTION

[0153] Various aspects of the disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The example embodiments of the disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiment set forth herein; rather, these embodiments are provided for thoroughness and completeness. Like reference characters refer to like elements throughout the description.

[0154] The disclosure mainly refers to disposable absorbent articles, which means articles that are not intended to be laundered or otherwise restored or reused as absorbent articles after use. By “absorbent article” is meant an article that absorbs or is adapted to absorb bodily fluids, such as urine, feces and / or blood.

[0155] Fig. 1 shows an absorbent article 1 comprising a chassis 2 extending along a longitudinal axis L from a front edge 23 at a front portion 3 of the chassis 2 to a back edge 24 at a back portion 4 of the chassis 2. The chassis 2 comprises a crotch portion 14 extending between said front portion 3 and said back portion 4. The front portion 3 is intended to be applied over the stomach of the wearer. The back portion 4 is intended to be applied over the back of the wearer. The crotch portion 14 is the narrow part of the absorbent article intended to be worn in the wearer 's crotch between the legs.

[0156] The chassis 2 comprises a first side edge 12 and a second side edge 13, respectively extending between the front 23 and back 24 edges of the chassis 2, on opposite sides of the chassis 2 with respect to the longitudinal axis L. The first 12 and second 13 side edges together define an hourglass shape of the chassis 2 such that the chassis 2 has a narrowest width Wh (see Fig. 3) along a transverse axis T extending perpendicularly to the longitudinal axis L.

[0157] The chassis 2 comprises a liquid-permeable topsheet 7, a liquid- impermeable backsheet 8 (see also Figs. 2), and an absorbent structure 9 disposed between the topsheet 7 and the backsheet 8. The chassis 2 is preferably symmetrical along the longitudinal axis L, with the topsheet 7 forming an inner surface of the chassis 2 for facing a person wearing the absorbent article (wearer), and the backsheet 8 forming an outer surface of the chassis 2. The chassis 2 is in Fig. 1 symmetrically arranged about the transversal axis T. The chassis 2 may however be asymmetrically arranged about the transversal axis T.

[0158] The absorbent article 1 further comprises a first side panel 10 attached to the front portion 3 of the chassis 2 at the first side edge 12 of the chassis 2, and a second side panel 11 attached to the front portion 3 of the chassis 2 at the second side edge 13 of the chassis 2. Further, the absorbent article 1 comprises a third side panel 21 attached to the back portion 4 of the chassis 2 at the first side edge 12 of the chassis 2, and a fourth side panel 22 attached to the back portion 4 of the chassis 2 at the second side edge 13 of the chassis 2. The third side panel 21 is provided with a first fastening means 17 configured to be attachable to said first side panel 10 or to said backsheet 8 at said front portion 3 of the chassis 2. Also, the fourth side panel 22 is provided with a second fastening means 19 configured to be attachable to said second side panel 11 or to said backsheet at said front portion 3 of the chassis 2.

[0159] The absorbent article 1 further comprises a first leg elastic 15 and a second leg elastic 16. Leg elastics 15, 16 are elastics which are adapted to seal the leg openings against the legs of the wearer during use. The elasticity of the leg elastics enables the leg elastic to tension material of the absorbent product for improved comfort and sealing between the absorbent product and a respective leg of a person wearing the absorbent product 1 .

[0160] The first leg elastic 15 is formed by three first elastic elements 15' attached to the chassis 2. The second leg elastic 16 is formed by three second elastic elements 16' attached to the chassis 2. The first and second elastic elements 15', 16' are arranged symmetrical about the longitudinal axis L. Each first elastic element 15' comprises three portions; two straight portions P1 , P3, i.e. a first straight portion P1 and a third straight portion P3 and a first central portion C1 , which is arranged longitudinally between the first and the third straight portions P1 , P3. The first straight portion P1 faces the front portion 3 of the chassis 2 and the third portion P3 faces the back portion 4 of the chassis 2. In Fig. 1 the ref. numbers P1 , P3, C1 are pointing to the respective portions of the first elastic element 15', which is arranged between two first elastic elements in the transversal direction, but each first elastic element comprises similar portions.

[0161] Each second elastic element 16' comprises three portions; two straight portions P2, P4, i.e. a second straight portion P2 and a fourth straight portion P4, and a second central portion C2, which is arranged longitudinally between the second and the fourth straight portions P2, P4. The second straight portion P2 faces the front portion 3 of the chassis 2 and the fourth straight portion P4 faces the back portion 4 of the chassis 2. In Fig. 1 the ref. numbers P2, P4, C2 are pointing to the respective portions of the second elastic element 16', which is arranged between two second elastic elements in the transversal direction, but each second elastic element comprises similar portions.

[0162] The first, second, third and fourth straight portions P1 , P2, P3, P4 are each an end portion of the first and second elastic elements 15', 16', respectively. The first straight portion P1 extends along the longitudinal axis L between the first central portion C1 of the first elastic element 15' and the front edge 23 and said second straight portion P2 extends along the longitudinal axis L between the second central portion C2 of the second elastic element 16' and the front edge 23. Here it is exemplified that the first straight portion P1 extends from the first central portion C1 toward the front end 23 of the chassis and the second straight portion P2 extends from the second central portion C2 toward the front end 23 of the chassis 2. Fig. 3 shows a schematic view of the chassis 2 in Fig. 1 with the first and the second side edges 12, 13 and with the leg elastics 15, 16 i.e. the three first and the three second elastic elements 15', 16'. As mentioned, each first elastic element 15' comprises a first straight portion P1 , which faces the front portion 3, and each second elastic element 16' comprises a second straight portion P2, which faces the front portion 3. Each first elastic element 15' comprises a third straight portion P3 which faces the back portion 4 and each second elastic element 16' comprises a fourth straight portion P4 which faces the back portion 4. Each first elastic element 15' comprises a first central portion C1 which is arranged between the first straight portion P1 and the third straight portion P3 in the longitudinal direction. Each second elastic element 15' comprises a second central portion C2 which is arranged between the second straight portion P2 and the fourth straight portion P4 in the longitudinally direction. The three first elastic elements 15' with their respective first straight portion P1 , third straight portion P3 and first central portion C1 are encircled by broken lines to show their extent. The three second elastic elements 16' with their respective second straight portion P2, fourth straight portion P4 and second central portion C2 are encircled by broken lines to show their extent.

[0163] The first central portion C1 of each first elastic element 15' may, as shown in Fig. 1 and Fig. 3, be curved, although other shapes can be used instead, such as V-shaped. Each first central portion C1 extends along a portion of the first side edge 12. The second central portion C2 of each second elastic element may, as shown in Fig. 1 , be curved, although other shapes can be used instead, such as V-shaped. Each second central portion C2 extends along a portion of the second side edge 13.

[0164] In Figs. 1 and 3, the curved first and second central portions C1 , C2 of each elastic element 15', 16' follow the shape of the first and second side edges 12, 13 of the chassis 2, respectively. Each first and second curved elastic central portion C1 , C2 is in Fig. 1 arranged symmetrically about the transversal axis T of the chassis. However, they are not limited to be symmetrical, they may be arranged to be asymmetrical about the transversal axis.

[0165] Each first elastic element 15' is an elastic thread 15', and each second elastic element 16' is an elastic thread 16'.

[0166] The first and second elastic elements 15', 16' are not limited to be three first and three second elastic elements. They may have a higher or lower number of elastic elements. Further, the number of first elastic elements 15' may be different to the number of second elastic elements 16'.

[0167] The shape or curvature of each first and second central portion C1 , C2 of each elastic element 15', 16' may be smooth, or it may be staggered by comprising multiple straight segments together defining the shape or curvature. Each first or second central portion C1 , C2 may also comprise two or three straight segments in a V-shape or a V-shape with a flat bottom instead of the curved / U-shape shown in Figs. 1 and 3. The first and the second elastic elements 15', 16' together form an hourglass shape, which has its narrowest width in the transverse direction. The narrowest width is usually in the crotch portion of the chassis.

[0168] As mentioned above, in the variant of Fig. 1 , each first elastic element 15' comprises a first straight portion P1 and each first straight portion is extending parallel to the longitudinal axis L from the respective first central portion C1 towards the front edge 23. The longitudinal extent of each first elastic element 15' overlaps with the longitudinal extension of the first side panel 10 at least a first distance D1 , as seen along said longitudinal axis L. In Fig. 1 , a portion of the longitudinal extent of the first straight portion P1 overlaps with the longitudinal extent of the first side panel 10 with said first distance D1 . Each second straight portion P2 of each second elastic element 16' is extending parallel to the longitudinal axis L from the respective second central portion C2 towards the front edge 23. The longitudinal extent of each second elastic element 16' overlaps with the longitudinal extension of the second side panel 11 at least a second distance D2, as seen along said longitudinal axis. In Fig. 1 , a portion of the longitudinal extent of the second straight portion P2 overlaps with the longitudinal extent of the second side panel 11 by said second distance D2.

[0169] As illustrated in Fig. 1 , each first elastic element 15' is transversally spaced from the first side panel 10, and each second elastic element 16' is transversally spaced from the second side panel 11 .

[0170] Each of the first straight portions P1 is arranged closer to the first side panel 10 than the respective first central portions C1 in the transversal direction (except at the transition between the first central portion C1 and the first straight portion P1). Each of the second straight portions P2 is arranged closer to the second side panel 11 than the respective second central portions C2 in the transversal direction (except at the transition between the second central portion C2 and the second straight portion P2).

[0171] In Fig. 1 , the longitudinal extents of all elastic elements overlap with the longitudinal extent of the respective first and second side panels 10, 11 , by said first and second distances D1 , D2. Alternatively, only a subset, such as one or two, of the first elastic elements 15' may with its longitudinal extent overlap with the longitudinal extent of the first side panel 10, as seen along the longitudinal axis, with at least said first distance D1 , and only a subset, such as one or two, of the second elastic elements 16' may with its longitudinal extent overlap with the longitudinal extent of the second side panel 11 , as seen along the longitudinal axis, with at least said second distance D2. The first D1 and second D2 distances are each preferably between 0.5 mm and half the longitudinal extent of the side panel along said longitudinal axis L.

[0172] According to one embodiment, the first and second distances D1 , D2 are in the range of 5-40 mm, preferably 10-30 mm. In Fig. 1 , the first and second distances D1 , D2 are 10 mm. Fig. 1 shows a product of medium size and the explicit measurements / distances mentioned to what is shown in Fig. 1 refer to such a medium sized product.

[0173] The first distance D1 is measured parallel to the longitudinal axis L from a back edge 25 of the first side panel 10 facing the back portion 4 of the chassis 2. The first distance D1 is further measured from a point P5 where the back edge 25 intersects the first side edge 12 of the chassis 2 where the first side panel is attached to the chassis 2. That is, from the intersection point P5 towards a front edge 26 of the first side panel 10 facing away from the back portion 4. The second distance D2 is measured parallel to the longitudinal axis L from a back edge 27 of the second side panel 1 1 facing the back portion 4 of the chassis 2 and said second distance D2 is measured from a point P6 where the back edge 27 intersects the second side edge 13 of the chassis 2 where the second side panel 1 1 is attached to the chassis 2. That is, from the intersection point P6 towards a front edge 28 of the second side panel 1 1 facing away from the back portion 4.

[0174] The first side panel 10 has a longitudinal extent E1 parallel to the longitudinal axis L, from the back edge 25 of the first side panel 10 facing the back portion 4 of the chassis 2, to the front edge 26 of the first side panel 10 facing away from the back portion 4 of the chassis 2. The straight portions P1 of each first elastic element 15' extends parallel to the longitudinal extent E1 of the first side panel 10. Also, the second side panel 1 1 has a longitudinal extent E2 parallel to the longitudinal axis L, from the back edge 27 of the second side panel 11 facing the back portion 4 of the chassis 2, to the front edge 28 of the second side panel 11 facing away from the back portion 4 of the chassis 2, wherein each second straight portion P2 of each second elastic element 16' extends parallel to the longitudinal extent E1 of the second side panel 11 .

[0175] The longitudinal extension of each first elastic element 15' is also overlapping with the longitudinal extension of the third side panel 23 at least a third distance D3, as seen along the longitudinal direction. The longitudinal extension of each second elastic element 16' is overlapping with the longitudinal extension of the fourth side panel 22 at least a fourth distance D4, as seen along the longitudinal axis L. In Fig. 1 , a portion of the longitudinal extension of each third straight portion P3 overlaps with the longitudinal extension of the third side panel 21 with said third distance D3, as seen along the longitudinal axis L and a portion of the longitudinal extension of each fourth straight portion P4 overlaps with the longitudinal extension of the fourth side panel 22 with said third distance D4, as seen along the longitudinal axis L.

[0176] Each third straight portion P3 of each first elastic element 15' is extending parallel to the longitudinal axis L from the respective first central portion C1 towards the back edge 24. Each fourth straight portion P4 of each second elastic element 16' is extending parallel to the longitudinal axis L from the respective second central portions C2 towards the back edge 24.

[0177] Each of the third straight portions P3 is arranged closer to the third side panel 21 than the respective first central portions C1 in the transversal direction (except at the transition between the first central portion C1 and the third straight portion P3). Each of the fourth straight portions P4 is arranged closer to the fourth side panel 22 than the respective second central portions C2 in the transversal direction (except at the transition between the second central portion C2 and the fourth straight portion P4). In Fig. 1 , the longitudinal extents of all first and second elastic elements overlap with the longitudinal extent of the respective third and fourth side panels 21 , 22 with said third and fourth distance D3, D4. Alternatively, only a subset, such as one or two, of the first elastic elements 15' may with its / their longitudinal extent(s) overlap with the longitudinal extent of the third side panel 21 , as seen along the longitudinal axis, with at least said third distance D3, and only a subset, such as one or two, of the second elastic elements 16' may with its / their longitudinal extent(s) overlap with the longitudinal extent of the fourth side panel 22, as seen along the longitudinal axis, with at least said fourth distance D4.

[0178] The third distance D3 and the fourth distance D4 are each preferably between 0.5 mm and half the width of the respective third and fourth side panel 21 , 22.

[0179] According to one embodiment the third and fourth distance D3, D4 are in the range of 5-40 mm, preferably 10-30 mm. In Fig. 1 , the third and fourth distance D3, D4 are 40mm.

[0180] The third distance D3 is measured parallel to the longitudinal axis L, from a front edge 46 of the third side panel 21 facing the front portion 3 of the chassis 2, and said third distance D3 is measured from the point P7 where the front edge 46 of the third side panel intersects the first side edge 12 of the chassis 2, where the third side panel 21 is attached to the chassis 2. That is, from the intersection point P7 towards a back edge 45 of the third side panel 21 facing away from the front portion 3. The fourth distance D4 is measured parallel to the longitudinal axis L, from a front edge 66 of the fourth side panel 22 facing the front portion 3 of the chassis 2, and said fourth distance D4 is measured from the point P8 where the front edge 66 of the fourth side panel 22 intersects the second side edge 13 of the chassis 2, where the fourth side panel 22 is attached to the chassis 2. That is, from the intersection point P8 towards a back edge 65 of the fourth side panel 22 facing away from the front portion 3.

[0181] The third side panel 21 has a longitudinal extent E3 parallel to the longitudinal axis L, from the front edge 46 of the third side panel 21 facing the front portion 3 of the chassis 2, to the back edge 45 of the third side panel 21 facing away from the front portion 3 of the chassis 2. The third straight portion P3 of each first elastic element 15 extends parallel to the longitudinal extent E3 of the third side panel 21 . Also, the fourth side panel 22 has a longitudinal extent E4 parallel to the longitudinal axis L, from the front edge 66 of the fourth side panel 22 facing the front portion 3 of the chassis 2, to the back edge 65 of the fourth side panel 22 facing away from the front portion 3 of the chassis 2. The fourth straight portion P4 of each second elastic element 16' extends parallel to the longitudinal extent E4 of the fourth side panel 11 . In Fig. 1 the longitudinal extensions of the third straight portions P3 and the fourth straight portions P4 of each elastic element partly overlap with the longitudinal extension of the third side panel 21 and the fourth side panel 22 respectively.

[0182] Each of the first and second elastic elements 15', 16' in Fig. 1 and 3 is an elastic thread 15', 16' as discussed above, but in other embodiments, any other suitable elastic element may alternatively be used instead, such as for example elastic film or elastic foam. In such a case, there is usually only one first elastic element 15' and one second elastic element 16'.

[0183] Each of the first and second elastic elements 15', 16', i.e. the elastic threads 15', 16' in Fig. 1 , is attached to the chassis 2 by adhesive, but in other embodiments, any other suitable way of attaching the elastic elements 15', 16' to the chassis 2 may alternatively be used instead, such as welding together layers between which the elastic elements 15', 16' are interposed such that the elastic elements are mechanically held in place between welded portions of the layers. As shown in fig. 2, each of the first and second elastic elements 15', 16' i.e. the elastic threads 15', 16', is positioned between the backsheet 8 and a respective barrier member 29, also called standing gather.

[0184] The barrier members 29 define barriers or walls protruding against the wearer to mitigate leakage of body liquid, such as urine and / or liquid feces. They are arranged on the side which will be facing the wearer during use, and they are arranged along respective side edges of the absorbent structure 9 and along the entire length of the chassis. It will be appreciated, however, that, depending on production techniques employed, the barrier members 29 may terminate short of the front edge 23 and / or back edge 24 of the chassis 2. As is readily apparent from Fig. 2, each barrier member (standing gather) 29 has a freestanding first end edge region 30 at least in the crotch portion 14 of the chassis and a second end edge region 33 attached at least to the backsheet 8 and / or the topsheet 7. In Fig. 2 the barrier members 29 are connected to both the backsheet 8 and the topsheet 7. The freestanding first end edge region 30 extends freely from a proximal connection 31 with said topsheet 7. Close to the front edge 23 and / or back edge 24 the free-standing first end edge region 30 of the barrier members 29 may be connected to the topsheet. The barrier members 29 contain elastics 32 in the freestanding first end edge region 30 within a pocket for elastically gathering at least a center portion of each barrier member 29, thereby promoting a comfortable fit preventing leakage of body liquid. Each of the second end edge regions 33 is connected to the backsheet 8, and between the backsheet 8 and the respective barrier members 29 each of the first and second elastic elements 15', 16' is arranged. The elastic material 32 for the standing gather may be a thread, yarn or ribbon of elastic material extending along the longitudinal axis L.

[0185] The barrier members 29 may comprise or consist of a sheet material of nonwoven material, such as a spun-bond material. The nonwoven material may contain a high degree of polyolefin, in particular polypropylene or polyethylene. The nonwoven material may also contain a slip agent such as erucamide, a wax and / or a lubricant. The sheet material of the barrier members 29 may comprise two outer layers of a spunbond material and an intermediate layer between the outer layers that is of a melt blown material. Additional intermediate layers of spunbond or melt blown materials may also be provided.

[0186] As illustrated in Fig. 2, the topsheet 7 may, at least in the crotch portion of the absorbent article, be arranged in a region delimited by the barrier members 29. It will be appreciated that, depending on production techniques employed, the topsheet 7 may transversally extend in between the backsheet 8 and the barrier members 29. The barrier members 29 may alternatively terminate by the proximal connection 31 of the barrier members 29, as is known in the field, and thus not transversally extend all the away to the side edges as shown in Fig. 2. The first and the second elastic elements 15', 16' may then alternatively be positioned between the backsheet 8 and the topsheet 7, or between any other layers, such as layers of a multi-layer backsheet 8.

[0187] In Fig. 1 and Fig. 2 the topsheet 7 and the barrier members 29 are connected at the respective proximal connection 31 by adhesive or welding. The width and the length of the chassis are equal to the width and length of both the combined topsheet 7 / barrier member 29 and the backsheet 8. Alternatively, if no barrier members 29 are present or if the barrier members are attached only to the topsheet, the topsheet 7 and the backsheet 8 may have same width and length over the entire surface area of the chassis. Thus, the width and the length of the chassis are equal to the width and length of both the topsheet 7 and the backsheet 8 (not shown). They may however slightly differ as long as the elastic elements 15, 16 can be arranged between the materials forming the chassis 2. The chassis 2 being shaped to, in use, cover a wearer’s entire pubic region and at least part of the buttocks with the topsheet 7 directed towards the wearer, and the backsheet 8 facing away from the wearer.

[0188] As mentioned above, each of the first and second elastic elements 15', 16', i.e. the elastic threads 15', 16', comprise three portions. Each first elastic element 15' comprises a first straight portion P1 extending parallel to the longitudinal axis L from the respective first central portion C1 towards the front edge 23 and a third straight portion P3 extending parallel to the longitudinal axis L from the first central portion C1 towards the back edge 24. Each second elastic element 16' comprises a second straight portion P2 extending parallel to the longitudinal axis L from the respective second central portion C2 towards the front edge 23 and a fourth straight portion P4 extending parallel to the longitudinal axis L from the respective second central portion C2 towards the back edge 24.

[0189] A spacing, in the transversal direction between the first elastic elements 15', at the first and third straight portions P1 , P3, is 3 mm in Fig. 1 , but may in other embodiments alternatively be varied as suitable. The transversal spacing between the first elastic elements 15', at the first straight and the third straight portions P1 , P3, may for example be between 0.5-15 mm, preferably 0.5-6 mm more preferably 0.5-4 mm.

[0190] A spacing, in the transversal direction between the second elastic elements 16', at the second and fourth straight portions P2, P4, is 3 mm in Fig. 1 , but may in other embodiments alternatively be varied as suitable. The transversal spacing between the second elastic threads 16', at the second and the fourth straight portions P2, P4 may for example be between 0.5-15 mm, preferably 0.5-6 mm more preferably 0.5-4 mm.

[0191] A transversal spacing between the first elastic elements 15' at the first central portions C1 increases from a smaller spacing closer to the first and third straight portions P1 , P3 to a larger spacing further away from the first and third straight portions P1 , P3. A transversal spacing between the second elastic elements 16' at the second central portions C2 increases from a smaller spacing closer to the second and fourth straight portions P2, P4 to a larger spacing further away from the second and fourth straight portions P2, P4. That is, the transversal spacing between the elastic elements 15', 16' at the first and the second central portions C1 , C2 is larger than the transversal spacing at the straight portions P1 , P2, P3 P4.

[0192] In other embodiments, the transversal spacing between the first elastic elements 15' may be the same all along the first elastic elements 15' and the transversal spacing between the second elastic elements 16' may be the same all along the second elastic elements 16'.

[0193] The largest transversal spacing between each of the first and second elastic elements 15', 16' at the respective first and second central portions C1 , C2 is in the range of 0.5 -15mm, preferably 0.5-10mm more preferably 0.5-8mm.

[0194] In Fig. 1 all the straight portions i.e. the first, second, third and fourth straight portions P1 , P2, P3, P4 extend parallel to the longitudinal axis. They may however form an angle to the longitudinal axis L being less than 20 degrees, such as less than 10 degrees, or less than 5 degrees. It may be advantageous from a production perspective that they are extending parallel to the longitudinal axis.

[0195] Each of the first, second, third and fourth straight portions P1 , P2, P3, P4 has a longitudinal extension and a transversal extension, the longitudinal extension being greater than the transversal extension.

[0196] Each of the first and second straight portions P1 , P2 has an extension along the longitudinal axis of at least 5mm, preferably 5 to 90 mm, more preferably 20 to 70 mm. Each of the third and the fourth straight portions P3, P4 has an extension along the longitudinal axis of at least 5 mm, preferably 5 to 130 mm, more preferably 30-100mm.

[0197] Further, each of the first, second, third and fourth straight portions P1 , P2, P3, P4 is an end portion of the first and second elastic elements, respectively. All the first straight portions P1 are straight and parallel to each other. All the second straight portions P2 are straight and parallel to each other. All the third straight portions P3 are straight and parallel to each other. All the fourth straight portions P4 are straight and parallel to each other.

[0198] The central portion C1 of each first elastic element 15' in Fig.1 is curved such that a direction of curvature of an end of the first central portion C1 at a transition between the first central portion C1 and the first straight portion P1 , follows an imaginary line L1 extending at an angle A1 to the longitudinal axis L within a range of 10-50 degrees, preferably 20-40 degrees. The central portion C2 of each second elastic element 16 in Fig.1 is curved such that a direction of curvature of an end of the second central portion C2 at a transition between the second central portion C2 and the second straight portion P2, follows an imaginary line L2 extending at an angle A2 to the longitudinal axis L within a range of 10-50 degrees, preferably 20-40 degrees.

[0199] Specifically, the first central portion C1 of each first elastic element 15 is curved such that a direction of curvature of an end of the first central portion C1 at a transition between the first central portion C1 and the first straight portion P1 , follows an imaginary line L1 intersecting a portion of the first side edge 12 of the chassis 2 where the first side panel 10 is attached to the chassis 2. The second central portion C2 of each second elastic element 16 is curved such that a direction of curvature of an end of the second central portion C2 at a transition between the second central portion C2 and second straight portion P2, follows an imaginary line L2 intersecting a portion of the second side edge 13 of the chassis 2 where the second side panel 11 is attached to the chassis 2.

[0200] Further, the first central portion C1 of each first elastic element 15' is curved such that a direction of curvature of an end of the first central portion C1 at a transition between the first central portion C1 and the third straight portion P3, follows an imaginary line L3 extending at an angle A3 to the longitudinal axis L within a range of 10-50 degrees, preferably 20-40 degrees. The second central portion C2 of each second elastic element 16, i.e. each elastic thread 16', is curved such that a direction of curvature of an end of the second central portion C2 at a transition between the second central portion C2 and the fourth straight portion P4, follows an imaginary line L4 extending at an angle A4 to the longitudinal axis L within a range of 10-50 degrees, preferably 20-40 degrees.

[0201] Specifically, the first central portion C1 of each first elastic element 15', is curved such that a direction of curvature of an end of the first central portion C1 at a transition between the first central portion C1 , and the third straight portion P3, follows an imaginary line L3 intersecting a portion of the first side edge 12 of the chassis 2 where the third side panel 21 is attached to the chassis 2 and the second central portion C2 of each second elastic element 16' is curved such that a direction of curvature of an end of the second central portion C2 at a transition between the second central portion C2 and the fourth straight portion P4, follows an imaginary line L4 intersecting a portion of the second side edge 13 of the chassis 2 where the fourth side panel 22 is attached to the chassis 2.

[0202] In Fig. 1 the first central portion C1 of each first elastic element 15' and the second central portion C2 of each second elastic elements 16' are each connected directly to the respective first, second, third and fourth straight portions P1 , P2, P3, P4. However, each first and second central portion C1 , C2 may be connected to the respective first, second, third and fourth straight portion P1 , P2, P3, P4 via a respective first, second, third and fourth connection portion which will be further described in relation to Fig. 9, where everything described and shown in Fig 1 is the same except for the first, second, third and fourth connection portion 18 and what is stated in relation to Fig. 9.

[0203] When the absorbent article 1 is applied on a wearer, the third and fourth side panels 21 , 22 in the back are pulled by gripping them at their outer ends where the fastening means 17, 19, such as hook tabs / patches, is / are situated. The fastening means 17, 19 are attached to the backsheet in the front portion 3 of the absorbent article or to the respective first and second side panels 10, 11 , which also have been stretched out. Thus, by having the longitudinal extension of the elastic elements 15', 16'overlap with the longitudinal extension of the respective side panels, the side panels will pull the elastic elements, i.e. the leg elastics and tighten the around the body both front and back.

[0204] In Fig. 1 only the longitudinal extent of each of the first, second, third and fourth straight portions P1 , P2, P3, P4 overlap with the longitudinal extent of the first, second, third and fourth side panel respectively. However, a portion of the longitudinal extension of each first and second central portion C1 , C2 may also overlap with the longitudinal extension of the first, second, third and fourth side panel 10, 11 respectively, as seen along the longitudinal axis L. See Fig. 4, where the second side panel 11 is shown, but this also apply to the first side portion and the third and fourth side portions in the back of the absorbent article. In Fig. 4, the longitudinal extension of the second straight portion P2 and a part of the longitudinal extension of the second central portion C2 of the second elastic elements 16' together overlap the longitudinal extension of the second side panel 11 with the second distance D2, as seen along the longitudinal direction. As can be seen in Fig. 1 , each first and second side panel 10, 1 1 , which is attached to the front portion 3 of the chassis 2 and each of the third and fourth side panel 21 , 22 which is attached to the back portion 4 of the chassis 2 extend laterally, with respect to the longitudinal axis L, a respective distance D5, D6, D8, D9 away from the chassis. The transversal distance D5, D6, D8, D9 of each side panel may be in the range of 50-400mm from the respective side edge 12, 13 of the chassis 2 where the respective side panel 10, 1 1 , 21 , 22 is attached to the chassis 2. That is, the width of each side panel is measured from the edge of the chassis 2 where the respective side panel is attached to the chassis 2. In the illustrated embodiment shown in Fig. 1 , the transversal distance D5, D6 of the first and second side panels 10, 1 1 is respectively 155 mm. In the illustrated embodiment, the transversal distances D8, D9 for the third and fourth side panels 21 , 22 is respectively 155 mm. In Fig. 1 , the first, second, third and fourth side panel 10, 1 1 , 21 , 22 extends the same transversal distance. However, the distances D5, D6 of the first and second side panels 10, 1 1 may differ from the distances D8, D9 of the third and fourth side panel 21 , 22. They may be shorter or longer.

[0205] Each one of the first and second side panels 10, 1 1 extends a distance D7 in the range of 100- 300 mm along the longitudinal axis L. In the illustrated embodiment, the distance D7 is 150mm.

[0206] Each one of the third and fourth side panels 21 , 22 extends a distance D10 in the range of 100-300mm along the longitudinal axis L. In the illustrated embodiment, the distance D10 is 180 mm.

[0207] The side panels 10, 1 1 , 21 , 22 are rectangular, which makes them easier to produce from continuous webs of material. In other embodiments, the side panels 10, 1 1 , 21 , 22 may however have any other suitable shape.

[0208] Fig 5. shows an alternative shape of the second side panel 1 1 . Only the second side panel 1 1 is shown, but the first, third and fourth side panel may have a similar shape. In the second side panel 1 1 in Fig. 5 the back edge 27 of the second side panel 1 1 intended to face the back portion 4 of the chassis 2 is inclined to the transversal axis T. As mentioned, the longitudinal extent of each second elastic elements 16' overlaps with the longitudinal extension of the second side panel 1 1 at least the second distance D2, as seen along said longitudinal axis. The second distance D2 is in this case measured parallel to the longitudinal axis L from a point P6 where the inclined back edge 27 intersects the second side edge 13 of the chassis 2 where the second side panel 1 1 is attached to the chassis 2.

[0209] As shown in Fig. 1 , the first and second side edges 12, 13 together define an hourglass shape of the chassis 2 and it has its narrowest width in the transverse direction in said crotch portion 14 of the chassis 2. The first side edge 12 and the second side edge 13 are hence curved at the crotch portion 14 of the chassis 2. In the embodiment illustrated in Fig. 1 , the curvature is smooth, but in other embodiments, the curvature may be defined by multiple straight segments together defining the curvature, such as a V-shaped curvature with two straight segments or with three straight segments, where the middle section is essentially parallel with the longitudinal axis L.

[0210] The absorbent structure 9, as depicted in Fig. 1 and 2, has a length and width being smaller than the length and width of the connected topsheet 7 / barrier members 29 and the backsheet 8, thus being positioned in a central region of the chassis where liquid and feces exit the body of the wearer. This results in a less bulky, more comfortable design, thereby being preferred. However, it will occur to the skilled person that alternative sizes, shapes, and configurations of the absorbent structure may also be suitable for use in an absorbent article as presented herein.

[0211] The absorbent structure 9 has an hourglass-shape, which is intended to be situated at the narrowest region between the wearer’s thighs when being worn. The longitudinal side edges of the connected topsheet 7 / barrier members 29 and backsheet 8 also have a similar hour-glass shape. This results in the insert being more formfitting and thus more comfortable to wear than if it were to have a rectangular shape.

[0212] The hourglass-shaped absorbent structure 9 comprises an absorption body 34 and a receiving layer 35. The receiving layer 35, also called distribution and acquisition layer is positioned directly below the topsheet 7 (see Fig. 2) and is adapted to rapidly receive quite large quantities of liquid and to retain this liquid temporarily, in order to subsequently release the temporarily stored liquid to other parts of the absorbent structure. That is, the acquisition layer is suitably adapted to quickly receive and temporarily store discharged liquid before it is absorbed by the absorbent body 34. The absorbent structure 9 may also be called absorbent core.

[0213] Alternative configurations of the absorbent structure 9 may be envisaged, for example, the receiving layer may be considered optional, and / or the absorbent structure may comprise a second absorption body (not shown). The absorbent structure 9 as such may be constructed similarly to known absorbent assemblies and as such can the absorption body 34 and also a second absorption body (not shown) be constructed from one or more layers of cellulose fluff pulp. The cellulose fluff pulp can be mixed for this purpose with fibers or particles of a high-absorbency polymer material, known as superabsorbents, of the kind which, in conjunction with absorption, chemically bonds large quantities of liquid to form a liquid-containing gel. The absorption body 34 can also contain high-absorbency polymer material arranged in a layer inside the absorption body or in conjunction with the surface or surfaces of the absorption body. Additional components to improve the characteristics of the absorbent structure can also be present in the absorbent structure. Examples of such components include binding fibers, different types of liquiddistributing layers or fibers, form-stabilizing components, reinforcing fibers or the like. The absorption body 34 can naturally also consist of other types of absorption material, such as absorbent nonwoven material, absorbent foam, textile materials, peat or mixtures of different kinds of absorption material.

[0214] Superabsorbent polymers are well-known in the field of absorbent products and are used to help improve the absorbent properties of such products. Superabsorbent polymers are constituted by water-swellable and waterinsoluble polymers that are capable of absorbing large quantities of liquid upon formation of a hydrogel, such as capable of absorbing at least five times their weight of an aqueous 0.9 % saline solution as measured according to the method NWSP 241.0.R2 (15) Polyacrylate Superabsorbent Powders — Determination of the Fluid Retention Capacity in Saline Solution by Gravimetric Measurement Following Centrifugation.

[0215] The superabsorbent polymers for use in accordance with the present disclosure may be inorganic or organic crosslinked hydrophilic polymers, such as polyvinyl alcohols, polyethylene oxides, crosslinked starches, guar gum, xanthan gum, crosslinked polyacrylates, and the like. The polymers may be in the form of powders, granules, microparticles, films, foams and fibers, for example. Upon contact with liquids, such super absorbent polymers swell by absorbing the liquids into their structures. In general, super absorbent polymers can quickly absorb liquids insulted into such products, and can retain such liquids to prevent leakage and help provide a dry feel even after liquid insult.

[0216] The type of super absorbent polymer used in an absorption body 34 of the embodiments discussed herein may be the same or may vary within the absorbent structure. For example, a super absorbent polymer with a first set of characteristics may be used in the front and back regions of the absorbent structure, or in a first absorbent body, and a super absorbent polymer with a second set of characteristics may be used in the central region of the absorbent structure, or in a second absorbent body. The characteristics referred to in this section is for example the centrifuge retention capacity (CRC), absorption under load (AUL) and / or the gel layer permeability (GLP).

[0217] Materials suitable as the receiving layer 35 i.e. acquisition layer, also referred to in the art as transfer layer, or ADL (acquisition and distribution layer), are commonly known in the art of disposable absorbent articles, and for the purposes of the present disclosure, any material known to the person skilled in the art as being useful as an acquisition layer may be used. An acquisition layer may for example be in the form of an airlaid layer, a spunlace layer, a high-loft nonwoven, foam or any other type of material layer which may be used in an absorbent article to act as a liquid acquisition and absorption layer. An airlaid nonwoven may be produced with fluff, wood pulp, and here the fluff fibers are dispersed into a fast-moving air stream and condensed onto a moving screen by means of pressure and vacuum. The acquisition layer may be of an air-through bonded nonwoven of polyester fibers.

[0218] The term “nonwoven”, mentioned in relation to the different parts of the disposable absorbent product, such as topsheet 7, backsheet 8 and or side portions, which in term of their properties are located between the groups of paper and cardboard on the one hand and textiles on the other hand. As regards nonwovens, a large number of extremely varied production processes are used, such as airlaid, wetlaid, spunlaced, spunbond, meltblown techniques etc. The fibers may be in the form of endless fibers or fibers prefabricated with an endless length, as synthetic fibers produced in situ or in the form of staple fibers. Alternatively, they may be made from natural fibers or from blends of synthetic fibers and natural fibers.

[0219] During use, the first 10 and third 21 side panels are tensioned and attached to each other around a leg of the wearer when putting on the absorbent article 1 to correctly position the absorbent article 1 and keep it in place. The second 11 and fourth 22 side panels are used in the same way around the other leg of the wearer. Alternatively, the third 21 and fourth side panels 22 are tensioned and attached to the backsheet 8 at the front of the absorbent article. The side panels 10, 11 , 21 , 22 are anchored to the chassis 2 between the barrier members 29 and the backsheet 8 to ascertain that they do not come off the absorbent article 1 when exposed to pulling forces.

[0220] In Fig. 1 the first and second side panels in the front are made of one piece of material. The first and second side panels 10, 11 are attached at the front portion 3 of the chassis 2 between the back sheet and the barrier member 19. Approximately 25 mm of each first and second side panel 10, 11 is protruding into the chassis 2 for being joined to the chassis at a joint 44. The joint 44 can be seen in Fig. 6. They are not limited to protrude 25 mm into the chassis. They may protrude more or less than 25 mm.

[0221] The material of the first and second side panels 10, 11 is preferably a nonwoven material and may be made from any suitable material as known in the art, such as fibrous nonwoven material. The material may be breathable and are preferably soft and pliable for providing good body conformance and comfort. A suitable nonwoven material can be a spun-bonded material of polypropylene or polyethylene fibers for example. Conjugate fibres may also be used. Another suitable nonwoven material is formed from a carded thermo-bonded material of polypropylene, polyester or conjugate fibres for example. The external surface of the front side panels should be adapted to function as a reception surface for fastening means, such as a “hook-and- loop fastener”. A “hook-and-loop fastener” refers to complementary fastening means having a “hook” portion (primary fastener) and a “loop” portion (second fastening means), and which are re-fastenable. The outside surface of the respective front side panels 10, 11 , which in use faces the wearer’s clothing, acts as the loop portion.

[0222] The third and the fourth side panels 21 , 22 are attached at the back portion 4 of the chassis 2, as shown in Fig. 1 . Approximately 25 mm of each third and fourth side panel 21 , 22 is protruding into the chassis 2 for being joined to the chassis. They are not limited to protrude 25 mm into the chassis. They may protrude more or less than 25mm.

[0223] Each side panel 10, 11 , 21 , 22 is attached to the chassis 2 at by a respective joint 44 (see Fig. 6). Fig. 6 shows the first side panel 10 in Fig. 1 and where the first side panel 10 is attached to the chassis 2. Fig. 6 also shows where the three first elastic elements 15', i.e. the three elastic threads 15', are attached. This is only described for the first side panel 10, but the second, the third and the fourth side panels 11 , 21 , 22 are attached in the same way.

[0224] As said above, the first side panel 10 is interposed between the barrier member 29 and the backsheet 8. The width W3 of the first side panel 10 thus sandwiched between the barrier member 29 and the backsheet 8, as measured along the transversal axis T of the absorbent article 1 , will vary depending on the size of the absorbent article 1 , and is typically between 8 and 30 mm. In this example it is 25 mm.

[0225] When, and in what order, the side panels are attached to the respective barrier members 29 and backsheet 8 will depend on the chosen manufacturing process. The first side panel 10 and the second side panel 11 are generally spaced a short distance D11 , for example about 15mm, from the front edge of chassis 23 of the chassis. The same apply to the third and fourth side panels 21 , 22 and the back edge 24. The joint 44 generally extends along the whole length of the side panel, as seen along the longitudinal axis L of the absorbent article 1 , but may in other embodiment alternatively extend along only a portion of the length of the side panel.

[0226] The joint 44 may be continuous, but could alternatively comprise intermittent lines or regions of attachment between the side panel and the chassis 2. Preferably, the joint 44 comprises adhesive bond lines, though any attachment methods, such as thermal or ultrasonic bonding, may alternatively be employed instead. If the absorbent product does not comprise any barrier members, i.e. only a topsheet, which extends over the whole absorbent structure 9, the side panel is interposed between the topsheet 7 and the backsheet 8 (not shown).

[0227] The first and the second elastic elements 15', 16' extend essentially along the longitudinal axis L of the chassis 2. The longitudinal extent of the first and second elastic elements 15', 16' are herein any extent of the elastic element when the elastic element is attached to the chassis 2 and the chassis is extended substantially planarly, as illustrated in Fig. 1. Before the first and second elastic elements 15', 16' are attached to the chassis 2, the elastic elements 15', 16' are stretched and when stretched, they are attached to the chassis 2.

[0228] The first and the second elastic elements 15', 16' are sandwiched between the backsheet 8 and the respective barrier member 29 and secured thereto under tension with hot melt adhesives. The elastic elements 15', 16' may however be sandwiched between the backsheet 8 and the topsheet 7, if the topsheet extends to the first and second side edges 12, 13 or between individual layers of the backsheet 8. For example, the backsheet 8 may comprise a breathable, or non-breathable, plastic film attached to a nonwoven outer layer. The plastic film of the backsheet 8 may be arranged adjacent the absorbent structure 9 and the nonwoven outer layer may be facing clothes of the wearer.

[0229] As shown in Fig, 6 adjacent the joint 44 a non-attached longitudinally extending region 56 is arranged, illustrated by the dashed rectangular area. Next to the non-attached longitudinally extending region 56 in the transversal direction towards the longitudinal axis L the material layers, for example the barrier member 29 or the topsheet 7 may be attached to the backsheet 8 by for example adhesive. The non-attached region 56 permits the elastic threads to snap back during manufacture. Thus, free ends of the elastic threads may reside in the non-attached longitudinally extending region 56. These free ends do not count as part of the first straight portion P1 . Hence, the first straight portion P1 is a portion which is attached to the chassis 2. The same applies to the second, third and fourth straight portion P2, P3, P4.

[0230] A joint 50 is provided next to the non-attached longitudinally extending region 56 in the longitudinal direction, which is along the longitudinal axis L, towards the transversal axis T between the backsheet 8 and the barrier member 29 in order to fasten the elastic threads 15' in the overlapping position. The joint 50 has a longitudinal extent along the longitudinal axis L which overlaps, as seen along the longitudinal axis, with the longitudinal extent of the first side panel 1 from the back edge 25 of the first side panel 21 towards the front edge 23 of the chassis 2. It overlaps with the first side panel 10 with the first distance D1 as seen in a longitudinal direction. As can be seen in Fig. 6 the joint 50 may also extend longitudinally towards the back edge 24 of the chassis (shown in Fig, 1 ).

[0231] The width of the joint 50 is preferably slightly larger than the width of three first elastic elements 15'. In this example the distance between the first elastic elements 15' at the first straight portions is 3mm and the width of the joint 50 is 24 mm.

[0232] In this example, adhesive is arranged on the backsheet 8 or on the barrier member 29 in order to form the joint 50. The adhesive may be slot coated or sprayed. The basis weight of adhesives to fix the respective first and second elastic elements 15, 16 between the backsheet 8 and the barrier member 29 is preferably in a range of 0.5 to 10.0 g / m2.

[0233] The joint 50 is to ensure that the ends of the elastic elements are fastened. Additional to the joint 50, further adhesives may be used to fasten the elastic elements to the chassis in the crotch portion of the chassis. This adhesive may also be slot coated or sprayed. As an alternative to spray or slot coating the adhesive to the backsheet 8 or to the barrier member 29, the adhesive may be applied to the elastic threads. As an alternative to using adhesive, the elastic elements 15, 16 may be fastened to the barrier member or to the backsheet 8 by ultrasonically welding the barrier member 7 to the backsheet 8 such that the elastic elements 15, 16 are trapped.

[0234] For example, the elastic threads are arranged between two material layers. At least two welds are arranged on opposite sides of a thread and the welds fasten the material layers together. The welds have respective proximal surfaces, facing towards the thread. The proximal surfaces of the welds are spaced apart by a distance, less than the diameter of the untensioned thread. Hence, due to the larger diameter when the thread is untensioned the thread is squeezed between the welds and hence entrapped.

[0235] The process for entrapping the thread can be carried out like this. Before creating the welds, the thread is tensioned in its longitudinal direction and positioned between the two material layers. The longitudinal tension of the elastic thread reduces the diameter of the thread from a value of the untensioned thread to a value less than the value of the untensoined thread. While the thread is in a tensioned state, at least two welds are created between the two material layers and on opposite sides of the thread. After the welds have been made, the thread tension is released, and the elastic thread is going back to its untensioned state where the diameter is larger than the distance between the welds and the thread is hence entrapped.

[0236] Materials suitable for forming the first and second elastic elements 15', 16' include polyurethane, rubber, elastic laminates, and other elastomeric materials. The elastic elements can be long or short elastic strands, elastic tapes, ribbons, yarns, etc. The fist and elastic elements 15, 16 may have a cross-sectional configuration that is flat, square, rectangular, circular, oval or some other shape. A suitable material for the elastic elements 15, 16 is LYCRA. LYCRA is a registered trademark. The third and fourth side panels 21 , 22 in Fig.1 , i.e. in the back of the article are elastic side panels. However, the elastic side panels are optional. The third and fourth side panels may be a one piece of nonwoven material, without any additional elastics. The material may then be the same as defined for the first and second side portions 11 , 12.

[0237] Figs. 7a and 7b show the third side panel 21 in Fig. 1 , which is an elastic side panel, at the back portion of the absorbent article. Fig. 7b shows the crosssection B-B in Fig. 7a. The fourth side panel 22 in Fig. 1 has a similar design and will hence not be explicitly described. I.e. only the features for the third side panel are described, but they are also applicable for the fourth side panel 22.

[0238] The third side panel 21 comprises a first side portion 60, which is attached to the chassis 2 and a second side panel portion 61 , distal to the first side portion 60 with respect to the chassis 2. The third side panel 21 further comprises a front edge 46 facing the front portion 3 of the chassis 2 and a back edge 45 facing away from the front portion 3 of the chassis 2 (see Fig. 1 ). The outer edge of the second side panel portion 61 and the opposite positioned first side edge 12 of the chassis and the front and back edges 45, 46 jointly define a rectangular shape of the third side panel 21 .

[0239] The third side panel 21 comprises an inner panel member 36 attached to the chassis, an outer panel member 37 and an elastic panel member 38. The terms “inner panel member” and “outer panel member” as used herein refer to the transversal location of the panel members. As such, each inner panel member 36 is located transversally closer to the longitudinal axis than the respective outer panel member 38. The inner panel member 36, the outer panel member 37 and the elastic panel member 38 each has a rectangular shape. The elastic panel member 38 is arranged between the inner panel member 36 and the outer panel member 37 in an overlapping manner. By providing a side panel with an elastic panel member 38, the side panel is able to better conform to wearers of different size and adapt to movements of the wearer.

[0240] The inner panel member 36 comprises a first side edge region 41 a and a second side edge region 41 b distal to the first side edge region 41 a. The first side edge region 41 a is attached to the chassis 2. That is, 25 mm of the inner panel member 36 is inserted between the backsheet 8 and the barrier member 29. The inner panel member 36 is attached to the backsheet 8 and the barrier member 29 by the joint 44 as described in relation to and shown in Fig. 6. The second side edge region 41 b of the inner panel member 36 is attached to a first side edge region 43a of the elastic panel member 38. A second side edge region 43b of the elastic panel member 38, distal to the first side edge region 43a of the elastic panel member 38, is attached to a first side edge region 47a of the outer panel member 37. A second side edge region 47b of the outer a panel member 37, distal to the first side edge region 47a, has at least one fastening means 17 coupled thereto. The inner panel member 36 and the elastic panel member 38 are fastened to each other in a first fastening region 52 in an overlapping manner in a first overlapping area 63. The elastic panel member 38 and the outer panel member 37 are fastened to each other in a second fastening region 53 in an overlapping manner in a second overlapping area 64. In this embodiment, the overlapping areas 63, 64 are welded together in the fastening regions 52, 53. However, they may also be joined by adhesive. One of ordinary skill in the art will understand the plurality of methods and procedures for affixing the portions together. The first and second overlapping areas 63, 64 are areas as seen in a plane spanned by the transversal and longitudinal axis. In the first / second overlapping area, a portion of the inner / outer panel member 36, 37 is arranged in a superposed relationship as seen in a thickness direction with the elastic panel member 38.

[0241] The width W of each overlapping area 63, 64 is here exemplified as being 15 mm wide (measured transversally to the longitudinal axis L) and is the width where two members overlap each other. The width W may however be between 10-20 mm wide. The width W2 of each fastening region 52, 53 in the respective overlapping area 63, 64 (measured transversally to the longitudinal axis L) is here exemplified as being 5 mm wide, but may in other embodiments be between 2-10 mm wide. The width of the fastening region is preferably smaller than the width of the overlapping area or the same size. An intermediate portion 38' of the elastic panel member 38 is arranged between the first fastening region 52 and the second fastening region 53.

[0242] The intermediate portion 38' is the active portion of the elastic panel member 38. With active portion is meant that it is the portion of the elastic side panel that will be activated, i.e. stretched out during use.

[0243] The first inner panel member 36 portion is here exemplified as 35 mm wide as measured from the first side edge chassis 2 edge to the first overlapping area 63 (measured transversally to the longitudinal axis L). When measuring from the first side edge 12 of the chassis 2 including the first overlapping area 63 the width is 50 mm. The first fastening region 52 and the second fastening region 53 are here exemplified as being arranged approximately in the middle of the respective overlapping area 63, 64. Hence, the intermediate portion 38' of the elastic panel member at a transition between said intermediate portion 38' and the first fastening region 52 is arranged at a distance D20 which is, in this example, 45mm from the first side edge 12 of the chassis 2 where the inner panel member 36 is attached to the chassis 2. Preferably, the distance D20 is maximum 2 / 3 of the third side panel width. Alternatively, the distance D20 is at least 20 mm. The distance D20 is measured transversally to the longitudinal axis L.

[0244] The width W3 of the elastic panel member 38 is exemplified as 35 mm wide (measured transversally to the longitudinal axis L) including the overlapping areas 63, 64. The intermediate portion 38' of the elastic panel member 38 has a width W1 along the transversal axis T, which here is exemplified as 15mm. The width W1 is preferably in the range of 5-20 mm. The width W1 is to be measured between the first fastening region 52 and the second fastening region 53 when the elastic panel member 38 is in a relaxed state. The elastic panel member 38 shall have a size that ensures it can work sufficiently while at the same time be as small as possible in order to be cost efficient. It is also beneficial from a sustainability perspective to have a small elastic panel member.

[0245] The width W1 of the intermediate portion 38' can be determined with a conventional ruler. For this purpose, the region comprising the intermediate portion 38' is laid perfectly flat, but not stretched. The width W1 of the intermediate portion 38' is then determined in between the first and second fastening regions 52, 53, to the nearest 1 mm. In case the width W1 of the intermediate portion 38' varies along the longitudinal axis L, such as can be obtained via irregular contours of the fastening regions or similar, a representative average width W1 must be calculated from a large number of measurements. If visualization of the width W1 is difficult, aids such as a light table or a microscope with a length scale can suitably be used.

[0246] All the other width or lengths mentioned herein may be measured in the same way. Le. the different widths and / or lengths can be determined with a conventional ruler. For this purpose, the region to be measured is laid perfectly flat, but not stretched. The width or length is then determined to the nearest 1 mm. In case the width varies along the longitudinal axis L or the length varies along the transversal axis, such as can be obtained via irregular contours a representative average width must be calculated from a large number of measurements. If visualization of the width or length is difficult, aids such as a light table or a microscope with a length scale can suitably be used.

[0247] The outer panel member 37 is here exemplified as 85 mm wide measured transversally to the longitudinal axis L, the second overlapping area 64 not included, and the width may be 100 mm including the second overlapping area 64. The width measured transversally to the longitudinal axis L of the second overlapping area 64 is 15 mm, but may in other embodiments be smaller of larger. The second fastening region 53 measured transversally to the longitudinal axis L in the second overlapping area 64 is here exemplified as being 5 mm wide.

[0248] Preferably, the inner panel member 36 and the outer panel member 37 are made of a nonwoven material, such as a fibrous nonwoven material, but may be made from any suitable material. The material may be breathable and is preferably soft and pliable for providing improved body conformance and comfort. A suitable nonwoven material is a spun-bonded material of polypropylene or polyethylene fibers for example. Conjugate fibers may also be used. Another suitable nonwoven material is formed from a carded thermo-bonded material of polypropylene, polyester or conjugate fibers for example.

[0249] The elastic panel member 38 has a length L0 along the longitudinal axis L. The length is here exemplified as being the same as the length of the inner panel member 36 and the outer panel member 37, but may be shorter or longer than the inner panel member 36 and / or the outer panel member 37. The length L0 is here exemplified as 180mm.

[0250] Each of the fastening regions 52, 53 extends along the whole length of the elastic panel member 38 in the longitudinal direction. They may however extend slightly shorter as long as the members are sufficiently fastened to each other.

[0251] The elastic panel member 38 may be an elastic laminate. It may for example be two fibrous layers with an elastic film layer between. It is then preferred that the first and the second layers of fibrous material (for example nonwoven layers) are chosen so that they, in combination with the intermediate elastic film layer, provide a soft and cloth-like feel to the laminate. Examples of suitable fibrous materials are carded webs and spun-bonded materials. Examples of suitable polymers used in the fibrous materials are polyethylene, polyesters, polypropylene and other polyolefin homo-polymers and copolymers. Natural fibers, for example cotton, may also be used as long as they provide the required properties. A mixture of polymers can contribute to a higher flexibility of the nonwoven layer.

[0252] The elastic film may be of any suitable elastic polymer, natural or synthetic. Some examples of suitable materials for the elastic film are low crystallinity polyethylenes, metallocene-catalysed low crystallinity polyethylene, ethylene vinyl acetate copolymers (EVA), polyurethane, polyisoprene, butadienestyrene copolymers, styrene block copolymers, such as styrene / isoprene / styrene (SIS), styrene / butadiene / styrene (SBS), or styrene / ethylene-butadiene / styrene block copolymer. Blends of these polymers may also be used as well as other modifying elastomeric or non-elastomeric materials.

[0253] For reasons of comfort, it is advantageous if the total basis weight of the laminate can be kept low. Thus, although a total basis weight of about 150 g / m2is acceptable, a total basis weight of 130 g / m2or less is preferred. The basis weight should be at least 20 g / m2.

[0254] The elastic panel member 38 comprises a first load at 120% which is in the range of 2-6N, preferable 2-4N. This ensures that it is easy to activate the elastic panel member, when applying the absorbent article to the wearer. It is desirable that the elastic panel member is easy to activate because you do not want to pull too much on the product when applying it, since it may then be uncomfortable for the wearer. If a higher force is needed to activate the elastic panel member it might be the case that the elastic panel member needs to be activated before it is applied to the wearer, i.e. after it is removed from the package or taken from a shelf, for example in a nursing home, and before it is being applied to a wearer. The caregiver maybe does not have the knowledge and / or time to do it and this can lead to the absorbent product is not properly fastened on the body of the wearer and may cause leakage and in a worst-case scenario fall down.

[0255] The elastic panel member 38 may comprise a second unload at 75% which is larger than 1 .2 N and a second unload at 50% which is larger than 0.8N. This improves that the absorbent product is sufficiently held on the body of the wearer. The absorbent product needs to have a certain force within the sheet material of the elastic panel member to stay on the body.

[0256] The following method is used for evaluating properties of the active portion, i.e. on the intermediate portion 38' on the elastic panel member 38.

[0257] Material for testing should be conditioned for at least 4 hours in an environment set to 23°C ± 2°C and 50% ± 5% relative humidity. Testing takes place in this same environment.

[0258] Rectangular sample strips are carefully cut from the elastic panel member 38 on the absorbent article. For this, a 25 x 60 mm cutting template is centered over the active portion, i.e. the intermediate portion 38', with the length direction of the template perpendicular to the longitudinal axis of the absorbent article (i.e. the sample length coincides with the direction of functional elasticity).

[0259] A 25 x 60 mm sample is thus obtained, comprising the elastic panel member 38 together with some material from the adjacent panel members (which is used for the subsequent insertion into the tensile tester clamps). The middle (central) 10 mm section of the active portion, i.e. intermediate portion 38' is then used for the evaluation. For a stable insertion into the tensile tester clamps, tape with a high friction backing is placed along the sample width (on both the front and the back side), immediately adjacent to the tested 10 mm section.

[0260] A suitable tensile tester (such as available from the Lloyd, Instron or Zwick companies) must be capable of cyclical movement. The tester is equipped with two vertically aligned clamps (at least 25 mm wide). Initially the clamps should be set 10 mm apart.

[0261] The tensile tester is calibrated according to manufacturer instructions, and the load is zeroed. The sample is inserted (vertically centered) into the clamps such that a very slight stress (preload) of about 0.05N rests over the sample (this preload should not be zeroed ahead of the test).

[0262] The upper clamp then moves at a speed of 100 mm / min for a 120% sample extension (for a 10 mm tested section, the final distance between the clamps then equals 22 mm). A first force (in Newtons) is read at the 120% sample extension (first loading phase). The cycle then returns to the start point with the same speed.

[0263] An identical second cycle is performed immediately afterwards. On the second movement downwards (second unloading phase) the force is read at 75% and 50% sample extensions (i.e. at total clamp distances of 17.5 mm and 15 mm for a 10 mm tested section).

[0264] In case the absorbent article has an elastic panel member 38 with a narrow active portion, i.e. intermediate portion 38' such as only 5 mm, the skilled person can easily adjust the settings above. The tape is then placed immediately adjacent to the 5 mm section, the clamps are set 5 mm apart, and a 120% sample extension equals an 11 mm final clamp separation.

[0265] Measurements are made on samples from five representative absorbent articles. Two representative samples are taken from each elastic panel member (i.e. 20 individual samples are tested in all). Arithmetic means are calculated for the 120% extension in the first loading phase, and 75% and 50% extensions in the second unloading phase. Results are reported in Newtons, to the first decimal.

[0266] The elasticity of the third and fourth side panel allows third and fourth side panel to stretch at least in a direction perpendicular to the longitudinal axis. The advantage of having elastics in the side panels in the back of the absorbent article is that the product adapts easier to the body, both when the person using the product being still and when moving. It also improves the ability of the absorbent article to adapt to different body shapes. Elastic side panels in the back also increases the products to stay in place during use and to be comfortable in most situations. It also makes the absorbent product more forgiving when applying the product on a wearer and hence decrease leakages.

[0267] The fastening means 17, 19 on the third and fourth side panels 21 , 22 may be of any suitable kind, such as adhesive or mechanical fastening means. A common type of mechanical fastening means is hook-and-loop fastening means. In the illustrated embodiment in Fig. 1 , the first and second fastening means 17, 19 each comprise a hook-type mechanical fastening patch, i.e. fastening means having multiple protruding hook elements which are engageable with a corresponding loop-type fastening means, such as a looptype nonwoven material forming a receiving region. The receiving region in Fig. 1 for the first and second fastening means 17,19 is the outside of the front portion of the absorbent article 1 , which in this case is provided with an outer nonwoven layer of the backsheet 8, said nonwoven layer being adapted to function as a loop fastening means for the hook fastening means. The first and second side panels 10, 1 1 also comprise a receiving region, i.e., a region at which the first fastening means 17, 19 are attachable. The term "hook" as used herein refers to any element capable of engaging another element, the so called “loop” portion. The term “hook” is not limited to only “hooks” in its normal sense, but rather encompasses any form of engaging elements, whether uni-directional or bi-directional. The term “loop” is likewise not limited to “loops” in its normal sense, but also encompasses any structure capable of engaging with a “hook” fastening means. Examples of “loop” materials are fibrous structures, like nonwoven materials. Hook-and- loop fastening means are for example available from Velcro, USA.

[0268] An alternative to a hook patch, that can be used as a fastening means, is a hook tab. A hook tab is a tab which has a substrate layer. One end of the substrate layer is attached to the back side panel in an attached portion and the other end comprises hooks forming a fastening portion and the end with the hooks is extending over the outer edge of the back side panel. The third and the fourth side panel 21 , 22 when they comprise hook tabs may each comprise two hook tabs. An example is shown in Fig. 8. Fig. 8 shows a schematic view of the fourth side panel 22 shown in Fig.1 with alternative fastening members 19 in the shape of fastening tabs 19'. Two fastening tabs 19' are attached to the fourth side panel 21 at the respective attached portions 48 and the fastening portions 49 with the hooks are outside the outer edge of the side panel 22. The third side panel 21 may also comprise two fastening tabs 19' in a similar way.

[0269] The absorbent article 1 may also have a waist elastic element 51 located in the back portion 4 close to the back edge 24 of the absorbent article 1 (see Fig. 1 ). It may also be provided with a waist elastic element (not shown) in the front portion 3. The absorbent article may have either one only in the front portion or only one in the back portion or two waist elastic elements, one in the front portion and one in the back portion 4. The waist elastic element 51 may be an elastic thread, elastic strip, etc., interposed between the topsheet 7 and the backsheet 8 of the absorbent article 1 and attached to the chassis 2 by gluing, thermal welding, etc., so that the topsheet 7 and backsheet 8 are pleated when the waist elastic element 51 is relaxed. Alternatively, the waist elastic element 51 may also be made of non-elastic nonwoven materials which is stretched or necked elasticized, or it may be made of an elastic laminate formed by laminating an elastic layer and a non-elastic layer.

[0270] The waist elastic element 51 may be an integral part of the absorbent article 1 , interposed between the topsheet 7 and the backsheet 8. However, the waist elastic element 51 , may alternatively be an elongated waist elastic element produced separately and then attached to the chassis at opposite longitudinal end portions of the waist elastic elements, by means known in the art, such as by gluing, welding, etc.

[0271] Fig. 9 shows the second side panel in fig.1 with an alternative configuration of the second elastic elements 16'.

[0272] In Fig. 9 the second central portion C2 and the second straight portion P2 of each second elastic element 16 ' are connected via a second connection portion 18, which is here exemplified as a curved connection portion 18. That is, a curved connecting portion 18 is arranged between the second central portion C2 and the second straight portion P2. The second elastic element 16' extends with its longitudinal extent along the longitudinal axis and is overlapping with the longitudinal extent of the second side panel with the second distance D2, which is in this example 20 mm. The same may apply to the other end of the second elastic element 16'. That is, the second central portion C2 and the fourth straight portion P4 of each second elastic element 16 ' may be connected via a fourth connection portion 18 (not shown), for example a curved connection portion. That is a fourth curved connecting portion is arranged between the second central portion C2 and the fourth straight portion P4. The fourth distance D4 may in this example be 40mm. An alternative shape of the connection portion is a straight connection portion, which may be in an angle to the longitudinal axis L. In Fig. 9 all three second elastic elements 16' has a curved connection portion, however it is possible that only one elastic element has a curved connection portion and the other two has a straight connection portion, or the other way around, or one has a curved connection portion, one has a straight portion, and the third one has a direct connection as in Fig. 1 , i.e. where the second straight portion P2 is connected to the second central portion C2. Hence, different combinations are possible.

[0273] The first elastic elements 15' in Fig. 1 may also be configured as in Fig. 9, with the first straight portion P1 of each first elastic element 15 ' connected via first connection portion 18, which may be a curved connection portion 18 (not shown) and / or the third straight portion P3 of each first elastic element 15 ' connected via third connection portion 18, which may be a curved connection portion 18 (not shown). That is a first curved connecting portion may be arranged between the first central portion C1 and the first straight portion P1 and a third curved connecting portion may be arranged between the first central portion C1 and the third straight portion P3. The first elastic element 15' extends with its longitudinal extent along the longitudinal axis L and is overlapping with the longitudinal extent of the first side panel with the first distance D1 , which is in this example 20mm. The first elastic element 15' extends with its longitudinal extent along the longitudinal axis L and is overlapping with the longitudinal extent of the third side panel with the third distance D4, which is in this example 20mm. The fourth distance D4 may in this example be 40 mm.

[0274] In Fig. 9 the second central portion C2 of each second elastic element 16', is curved such that a direction of curvature of an end of the second central portion C2, at a transition between the second central portion C2 and the second connecting portion 18, follows an imaginary line LC which is intersecting a portion of the second side edge 13 of the chassis 2, where the second side panel 11 is attached to the chassis 2. The same may apply for the other end of the second elastic element 16'. That is, the second central portion C2 of each second elastic element 16', may be curved such that a direction of curvature of an end of the second central portion C2, at a transition between the second central portion C2 and the fourth connecting portion 18, follows an imaginary line LC which is intersecting a portion of the second side edge 13 of the chassis 2, where the fourth side panel 22 is attached to the chassis 2 (not shown).

[0275] The first elastic elements 15' in Fig. 1 may also be configured as in Fig. 9 (not shown), with the first central portion C1 of each first elastic element 15', curved such that a direction of curvature of an end of the first central portion C1 , at a transition between the first central portion C1 and the first connecting portion 18, follows an imaginary line LC which is intersecting a portion of the first side edge 12 of the chassis 2, where the first side panel 10 is attached to the chassis 2. The same may apply for the other end of the first elastic element 15' (not shown). That is, the first central portion C1 of each first elastic element 15', may be curved such that a direction of curvature of an end of the first central portion C1 , at a transition between the first central portion C1 and the third connecting portion 18, follows an imaginary line LC which is intersecting a portion of the first side edge 12 of the chassis 2, where the third side panel 21 is attached to the chassis 2.

[0276] The lengths and the features of the first, second, third and fourth straight portions P1 , P2, P3, P4 and how they relate to each other when there is a plurality of elastic elements 15', 16' in Fig. 9 is the same as in Fig. 1 . The same goes for the first and second central portions C1 , C2 except for their extension in the ends which has been described above.

[0277] The distances mentioned in relation to the first and second elastic elements 15', 16' and / or the first, second, third and fourth straight portions P1 , P2, P3, P4 and how their longitudinal extensions relate to the respective first, second, third and fourth side panels 10, 11 , 21 , 22 is also the same as for Fig. 1 , except that part or the whole of the first, second, third and fourth portions may also with their longitudinal extension overlap with at least a portion of the longitudinal extent of their respective first, second, third and fourth side panel 10, 11 , 21 , 22.

Claims

CLAIMS1 . A disposable absorbent article (1 ) for absorbing body fluids and / or feces, said absorbent article (1 ) comprising: a chassis (2) extending along a longitudinal axis (L) from a front edge (23) at a front portion (3) of the chassis (2) to a back edge (24) at a back portion (4) of the chassis (2), said chassis (2) comprising a first side edge (12) and a second side edge (13) respectively extending between the front (23) and back (24) edges of the chassis (2), on opposite sides of the chassis (2) with respect to the longitudinal axis (L), said first (12) and second (13) side edges together defining an hourglass shape of the chassis (2) such that the chassis (2) has a narrowest width (Wh) along a transverse axis (T) extending perpendicularly to the longitudinal axis (L), said chassis (2) comprising a liquid-permeable topsheet (7), a liquid- impermeable backsheet (8) and an absorbent structure (9) disposed between said topsheet (7) and said backsheet (8), said absorbent article (1 ) further comprising a first side panel (10) attached to the front portion (3) of the chassis (2) at the first side edge (12) of the chassis (2), and a second side panel (11 ) attached to the front portion (3) of the chassis (2) at the second side edge (13) of the chassis (2), said absorbent article (1 ) further comprising a third side panel (21 ) attached to the back portion (4) of the chassis (2) at the first side edge (12) of the chassis (2), anda fourth side panel (22) attached to the back portion (4) of the chassis (2) at the second side edge (13) of the chassis (2), said third side panel (21 ) being provided with a first fastening means (17) configured to be attachable to said first side panel (10) or to said backsheet (8) at said front portion (3) of the chassis (2), and said fourth side panel (22) being provided with a second fastening means (19) configured to be attachable to said second side panel (11 ) or to said backsheet (8) at said front portion (3) of the chassis (2), said absorbent article (1 ) further comprising at least one first elastic element (15') attached to the chassis (2), said first elastic element (15') comprising a first central portion (C1 ) extending along a portion of the first side edge (12), said absorbent article (1 ) further comprising at least one second elastic element (16') attached to the chassis (2), said second elastic element (16') comprising a second central portion (C2) extending along a portion of the second side edge (13), said first elastic element (15') further comprising a first straight portion (P1) extending along the longitudinal axis (L) between the first central portion (C1 ) of the first elastic element (15') and the front edge (23), the longitudinal extent of said first elastic element (15') is overlapping with at least a portion of the longitudinal extent of said first side panel (10), at least a first distance (D1 ), as seen along said longitudinal axis (L), and said second elastic element (16') further comprising a second straight portion (P2) extending along the longitudinal axis (L) between the second central portion (C2) of the second elastic element (16') and the front edge (23), the longitudinal extent of said second elastic element (16') is overlapping with at least a portion of the longitudinal extent of the second side panel (11), at least a second distance (D2) as seen along said longitudinal axis (L).

2. The absorbent article (1 ) according to claim 1 , wherein said first distance (D1 ) is measured parallel to the longitudinal axis (L) from a point (P5) where a back edge (25) of the first side panel (10) facing the back portion (4) of the chassis (2) intersects the first side edge (12) of the chassis (2); and said second distance (D2) is measured parallel to the longitudinal axis (L) from a point (P6) where a back edge (27) of the second side panel (11 ) facing the back portion (4) of the chassis (2) intersects the second side edge (13) of the chassis (2).

3. The absorbent article (1 ) according to claim 1 or 2, wherein the first distance (D1 ) is larger than 5 mm and smaller than half the length of a longitudinal extent (E1 ) of the first side panel (10) parallel to the longitudinal axis (L), from a back edge (25) of the first side panel (10) facing the back portion (4) of the chassis (2), to a front edge (26) of the first side panel (10) facing away from the back portion (4) of the chassis (2), and wherein the second distance (D2) is larger than 5 mm and smaller than half the length of a longitudinal extent (E2) of the second side panel (11 ) parallel to the longitudinal axis (L), from a back edge (27) of the second side panel (11 ) facing the back portion (4) of the chassis (2), to a front edge (28) of the second side panel (11 ) facing away from the back portion (4) of the chassis (2).

4. The absorbent article (1 ) according to any one of the preceding claims, wherein each one of the first (D1 ) and second (D2) distances is in the range of 5-40 mm, preferably 10-30 mm.

5. The absorbent article (1 ) according to any one of the preceding claims, wherein each of the first and the second straight portions (P1 , P2) extend parallel to the longitudinal axis (L).

6. The absorbent article (1 ) according to any one of the preceding claims, wherein each of the first and second straight portions (P1 , P2) has an extension along the longitudinal axis (L) of at least 5 mm, preferably 5 to 90mm, more preferably 20 to 70mm.

7. The absorbent article (1 ) according to any one of the preceding claims, wherein the first side panel (10) has a longitudinal extent (E1 ) parallel to the longitudinal axis (L), from a back edge (25) of the first side panel (10) facing the back portion (4) of the chassis (2), to a front edge (26) of the first side panel (10) facing away from the back portion (4) of the chassis (2), wherein at least a portion of the first straight portion (P1 ) of the first elastic element (15') extends parallel to the longitudinal extent (E1 ) of the first side panel (10), thereby forming said overlap where the longitudinal extent of said first elastic element (15') is overlapping with at least a portion of the longitudinal extent of the first side panel (10) as seen along said longitudinal axis (L); and wherein the second side panel (11 ) has a longitudinal extent (E2) parallel to the longitudinal axis (L), from a back edge (27) of the second side panel (11 ) facing the back portion (4) of the chassis (2), to a front edge (28) of the second side panel (11 ) facing away from the back portion (4) of the chassis (2), wherein at least a portion of the second straight portion (P2) of the second elastic element (16') extends parallel to the longitudinal extent (E2) of the second side panel (11 ), thereby forming said overlap where the longitudinal extent of said second elastic element (16’) is overlapping with at least a portion of the longitudinal extent of the second side panel (11) as seen along said longitudinal axis (L).

8. The absorbent article (1 ) according to any one of the preceding claims, wherein said first elastic element (15') is an elastic thread (15'), and wherein said second elastic element (16') is an elastic thread (16’).

9. The absorbent article (1 ) according to any one of the preceding claims, wherein said first elastic element (15') and said second elastic element (16') are attached to the chassis (2) by adhesive and / or by welding.

10. The absorbent article (1 ) according to any one of the of the preceding claims, wherein each of the first and second elastic elements (15', 16') is positioned between the backsheet (8) and the topsheet (7), or between two sheets of material forming the backsheet (8), or between the backsheet (8) and a respective barrier member (29) connected to the topsheet (7) facing a wearer of the absorbent article (1 ).11 . The absorbent article (1) according to any one of the preceding claims, wherein said absorbent article comprises a plurality of first elastic elements (15') and a plurality of second elastic elements (16'), each of the first elastic elements (15') comprises a first central portion (C1 ) and a first straight portion (P1), each extending along a portion of the first side edge (12) and said first straight portion (P1) extending along the longitudinal axis (L) between the respective first central portion (C1 ) of the first elastic element(15’) and the front edge (23) and each of the second elastic elements (16’) comprises a second central portion (C2) and a second straight portion (P2), extending along a portion of the second side edge (13) and said second straight portion (P2) extending along the longitudinal axis (L) between the respective second central portion (C2) of the second elastic element (16’) and the front edge (23).

12. The absorbent article (1 ) according to claim 11 , wherein a transversal spacing between the first elastic elements (15'), at the first straight portions (P1 ), is 0.5-15 mm, preferably 0.5-6 mm, more preferably 0.5-4 mm, and wherein a transversal spacing between the second elastic elements (16'), at the second straight portions (P2), is 0.5-15 mm, preferably 0.5-6 mm, more preferably 0.5-4 mm.

13. The absorbent article (1 ) according to any one of claims 11 or 12, wherein a transversal spacing between the first elastic elements (15') increases from a smaller spacing closer to the first straight portions (P1) to a larger spacing further away from the first straight portions (P1), and wherein a transversal spacing between the second elastic elements (16') increases from a smaller spacing closer to the second straight portions (P2) to a larger spacing further away from the second straight portion (P2).

14. The absorbent article (1 ) according to any one of claims 11 -13, wherein the largest spacing between the first elastic elements (15’) at the first central portions (C1), is in the range of 0.5-15 mm, preferably 0.5-10 mm, more preferably 0.5-8 mm; and wherein the largest spacing between the second elastic elements (16') at the second central portions (C2), is in the range of 0.5-15 mm, preferably 0.5-10 mm, more preferably 0.5-8 mm.

15. The absorbent article (1 ) according to any one of the preceding claims, wherein said first straight portion (P1 ) extends along the longitudinal axis (L) from the first central portion (C1 ) of the first elastic element (15') towards the front edge (23) and said second straight portion (P2) extends along the longitudinal axis (L) from the second central portion (C2) of the second elastic element (16') towards the front edge (23).

16. The absorbent article (1 ) according to claim 15, wherein the first central portion (C1 ) of the first elastic element (15') is curved such that a direction of curvature of an end of the first central portion (C1 ) at a transition between the first central portion (C1 ) and the first straight portion (P1 ) follows a first imaginary line (L1 ) extending at a first angle (A1 ) to the longitudinal axis (L) within a range of 10-50 degrees, preferably 20-40 degrees and the second central portion (C2) of the second elastic element (16') is curved such that a direction of curvature of an end of the second central portion (C2) at a transition between the second central portion (C2) and the second straightportion (P2), follows a second imaginary line (L2) extending at a second angle (A2) to the longitudinal axis (L) within a range of 10-50 degrees, preferably 20-40 degrees.

17. The absorbent article (1 ) according to any one of the claims 15-16, wherein the first central portion (C1 ) of the first elastic element (15') is curved such that a direction of curvature of an end of the first central portion (C1 ) at a transition between the first central portion (C1) and the first straight portion (P1) follows a first imaginary line (L1 ) intersecting a portion of the first side edge (12) of the chassis (2) where the first side panel (21 ) is attached to the chassis (2) and the second central portion (C2) of the second elastic element (16') is curved such that a direction of curvature of an end of the second central portion (C2) at a transition between the second central portion (C2) and the second straight portion (P2) follows a second imaginary line (L2) intersecting a portion of the second side edge (13) of the chassis (2) where the second side panel (11 ) is attached to the chassis (2).

18. The absorbent article (1 ) according to any one of the claims 1 -14, wherein said first elastic element (15') comprises a first connecting portion (18), which is arranged between said first straight portion (P1 ) and said first central portion (C1 ) and said second elastic element (16') comprises a second connecting portion (18), which is arranged between said second straight portion (P2) and said second central portion (C2).

19. The absorbent article (1 ) according to claim 18, wherein said first connecting portion (18) is a first curved connecting portion (18) and said second connecting portion (18) is a second curved connecting portion (18).

20. The absorbent article (1 ) according to any one of the claims 18-19, wherein the first central portion (C1 ) of the first elastic element (15') is curved such that a direction of curvature of an end of the first central portion (C1 ) ata transition between the first central portion (C1) and the first connecting portion (18) follows an imaginary line (LC) intersecting a portion of the first side edge (12) of the chassis (2), where the first side panel (10) is attached to the chassis (2) and the second central portion (C2) of the second elastic element (16') is curved such that a direction of curvature of an end of the second central portion (C2) at a transition between the second central portion (C2) and the second connecting portion (18) follows a second imaginary line (LC) intersecting a portion of the second side edge (13) of the chassis (2), where the second side panel (11 ) is attached to the chassis (2).21 . The absorbent article (1 ) according to any one of the preceding claims, wherein a portion of the longitudinal extent of the respective first and second central portions (C1 , C2) overlaps with a portion of the longitudinal extent of the first side panel (10) and the second side panel (11 ) as seen along said longitudinal axis, respectively.

22. The absorbent article (1 ) according to any one of the preceding claims, wherein each one of the first, second, third and fourth side panel (10, 11 , 21 , 22) extends laterally, with respect to the longitudinal axis (L), a respective distance (D5, D6, D7, D8) away from the chassis (2) in the range of 50-400 mm from the respective first or second side edge (12, 13) of the chassis (2), where the respective side panel (10, 11 , 21 , 22) is attached to the chassis (2).

23. The absorbent article (1 ) according to any one of the preceding claims, wherein each one of the first, second, third and fourth side panel (10, 11 , 21 , 22) extends a distance (D7, D10) in the range of 100-300 mm along the longitudinal axis (L).

24. The absorbent article (1 ) according to any one of the preceding claims, wherein the first, second, third, and / or fourth side panels (10, 11 , 21 , 22) are rectangular.

25. The absorbent article (1 ) according to any one of the preceding claims, wherein the third side panel (21 ) and the fourth side panel (22) are elastic side panels.

26. The absorbent article (1 ) according to any one of the preceding claims, wherein the first side edge (12) comprises a curved portion between the first side panel (10) and the third side panel (21 ), and wherein the second side edge (12) comprises a curved portion between the second side panel (11) and the fourth side panel (22).

27. The absorbent article (1 ) according to any one of the preceding claims, wherein said first elastic element (15') further comprises a third straight portion (P3) extending along to the longitudinal axis (L) between the first central portion (C1 ) of the first elastic element (15') and the back edge (24) of the chassis (2), the longitudinal extent of said first elastic element (15') is overlapping with at least a portion the longitudinal extent of the third side panel (21 ) at least a third distance (D3), as seen along said longitudinal axis (L), and wherein said second elastic element (16') further comprises a fourth straight portion (P4) extending along to the longitudinal axis (L) between the second central portion (C2) of the at least one second elastic element (16) and the back edge (24) of the chassis (2), the longitudinal extent of said second elastic element (16') is overlapping with at least a portion the longitudinal extent of the fourth side panel (22) at least a fourth distance (D4) as seen along said longitudinal axis (L).

28. The absorbent article (1 ) according to claim 27, wherein said third distance (D3) is measured parallel to the longitudinal axis (L) from a point(P7) where a front edge (46) of the third side panel (21 ) facing the front portion (3) of the chassis (2) intersects the first side edge (12) of the chassis (2) and said fourth distance (D4) is measured parallel to the longitudinal axis (L) from a point (P8) where a front edge (66) of the fourth side panel (22) facing the front portion (3) of the chassis (2) intersects the second side edge (13) of the chassis (2).

29. The absorbent article (1 ) according to any one of claims 27-28, wherein the third distance (D3) is larger than 5 mm and smaller than half the length of a longitudinal extent (E3) of the third side panel (10) parallel to the longitudinal axis (L), from a front edge (46) of the third side panel (21 ) facing the front portion (3) of the chassis (2), to a back edge (45) of the third side panel (21 ) facing away from the front portion (3) of the chassis (2), and wherein the fourth distance (D4) is larger than 5 mm and smaller than half the length of a longitudinal extent (E4) of the fourth side panel (22) parallel to the longitudinal axis (L), from a front edge (66) of the fourth side panel (22) facing the front portion (3) of the chassis (2), to a back edge (65) of the fourth side panel (22) facing away from the front portion (3) of the chassis (2).

30. The absorbent article (1 ) according to any one of claims 27-29, wherein each one of the third (D3) and fourth (D4) distances is in the range of 5-40 mm, preferably 10-30 mm.31 . The absorbent article (1 ) according to any one of claims 27-30, wherein each of the third and the fourth straight portions (P3, P4) extends parallel to the longitudinal axis (L).

32. The absorbent article (1 ) according to any one of claims 27-31 , wherein each of the third and the fourth straight portions (P3, P4) has an extension along the longitudinal axis (L) of at least 5 mm, preferably 5 to 130 mm, more preferably 30-100mm.

33. The absorbent article (1 ) according to any one of claims 27-32, wherein a portion of the longitudinal extent of the respective first or second central portion (C1 , C2) overlaps a portion of the longitudinal extent of the third side panel (21 ) or the fourth side panel (22) as seen along said longitudinal axis (L), respectively.

34. The absorbent article (1 ) according to any one of claims 27-33, wherein said third straight portion (P3) extends along the longitudinal axis (L) from the first central portion (C1 ) of the first elastic element (15') towards the back edge (24) and said fourth straight portion (P4) extends along the longitudinal axis (L) from the second central portion (C2) of the second elastic element(16') towards the back edge (24).

35. The absorbent article (1 ) according to claim 34, wherein the first central portion (C1 ) of the first elastic element (15') is curved such that a direction of curvature of an end of the first central portion (C1 ), at a transition between the first central portion (C1 ) and the third straight portion (P3) follows a third imaginary line (L3) extending at a third angle (A3) to the longitudinal axis (L) within a range of 10-50 degrees, preferably 20-40 degrees and the second central portion (C2) of the second elastic element (16') is curved such that a direction of curvature of an end of the second central portion (C2) at a transition between the second central portion (C2) and the fourth straight portion (P4) follows a fourth imaginary line (L4) extending at a fourth angle (A4) to the longitudinal axis (L) within a range of 10-50 degrees, preferably 20-40 degrees.

36. The absorbent article (1 ) according to any one of claims 34-35, wherein the first central portion (C1 ) of the first elastic element (15') is curved such that a direction of curvature of an end of the first central portion (C1 ) at a transition between the first central portion (C1 ) and the third straight portion (P3) follows a third imaginary line (L3) intersecting a portion of the first sideedge (12) of the chassis (2) where the third side panel (21) is attached to the chassis (2) and the second central portion (C2) of the second elastic element (16') is curved such that a direction of curvature of an end of the second central portion (C2) at a transition between the second central portion (C2) and the fourth straight portion (P4) follows a fourth imaginary line (L4) intersecting a portion of the second side edge (13) of the chassis (2) where the fourth side panel (22) is attached to the chassis (2).

37. The absorbent article (1 ) according to any one of the claims 27-33, wherein said first elastic element (15') comprises a third connecting portion (18), which is arranged between said third straight portion (P3) and said first central portion (C1 ) and said second elastic element (16') comprises a fourth connecting portion (18), which is arranged between said fourth straight portion (P2) and said second central portion (C2).

38. The absorbent article (1 ) according to claim 37, wherein said third connecting portion (18) is a third curved connecting portion (18) and said fourth connecting portion (18) is a fourth curved connecting portion (18).

39. The absorbent article (1 ) according to any one of the claims 37-38, wherein the first central portion (C1 ) of the first elastic element (15') is curved such that a direction of curvature of an end of the first central portion (C1 ) at a transition between the first central portion (C1 ) and the third connecting portion (18) follows a third imaginary line (LC) intersecting a portion of the first side edge (12) of the chassis (2), where the third side panel (21 ) is attached to the chassis (2) and the second central portion (C2) of the second elastic element (16') is curved such that a direction of curvature of an end of the second central portion (C2) at a transition between the second central portion (C2) and the fourth connecting portion (18) follows a fourth imaginary line (LC) intersecting aportion of the second side edge (13) of the chassis (2), where the fourth side panel (22) is attached to the chassis (2).

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