Absorbent articles

Abstract

To provide an absorbent article capable of preventing a deviation prevention part having adhesiveness from being left on an underwear, when the absorbent article is detached from the underwear.SOLUTION: An absorber has at least one continuous groove which becomes recess from a non-skin side to a skin side, and on a non-skin side of a back sheet, there is formed a plurality of deviation prevention parts having adhesiveness and having a width direction length longer than a cross direction length and for fixing to an underwear, an absorbent article, the deviation prevention parts being arranged at an interval in the cross direction. The one continuous groove has two or more salient parts which are a salient state toward a front side of the continuous groove, and / or is formed in a shape having two or more salient parts toward a rear side of the continuous groove, and one continuous groove is configured so that an area in which a virtual area having a unit length in the cross direction and having a same width direction length to the absorber, overlaps to the one continuous groove, is 3% or more, and the one continuous groove includes a groove part which includes no central line extending along the cross direction in plan view. One deviation prevention part overlaps to the prescribed groove part so as to include one continuous groove in the width direction and includes the prescribed groove part in the cross direction in plan view, or does not overlap to the prescribed groove part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an absorbent article. [Background technology]

[0002] As absorbent articles such as sanitary napkins, panty liners, and incontinence pads, there are known structures that include a liquid-permeable top sheet on the skin side, a liquid-impermeable back sheet on the non-skin side, and an absorbent body disposed between the two sheets. Furthermore, the above-mentioned absorbent articles generally include a slip-prevention part on the non-skin side (the side opposite to the side facing the skin) to prevent the absorbent article from slipping out of the underwear while being worn.

[0003] The slip prevention portion of an absorbent article is often formed by applying an adhesive, and various configurations are known for its arrangement, including one in which the adhesive is applied in multiple stripes extending in the width direction of the absorbent article (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-296974 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, many absorbent articles have compression grooves formed by locally squeezing the top sheet and absorbent body for the purpose of promoting appropriate deformation to match the shape of the body when worn, etc. In such cases, even if the compression is performed on the skin side, grooves corresponding to the compressed parts on the skin side are more or less formed on the non-skin side (back sheet side) of the absorbent article.

[0006] Here, when the slip prevention part is applied across the groove formed on the non-skin side, air bubbles may get between the back sheet and the slip prevention part, creating a gap, and a portion where the back sheet and the slip prevention part are not in contact may be formed. If there is a portion where there is no contact, the adhesive strength between the slip prevention part and the underwear is greater than the adhesive strength between the slip prevention part and the back sheet. Therefore, when peeling off the absorbent article fixed to the underwear, the slip prevention part may not be able to follow the back sheet and may remain on the underwear. Considering that a normal user pulls the absorbent article from the front to the back to peel it off, such a remaining slip prevention part is likely to occur in a place where a groove containing many components extending across the front-to-rear direction, which is the pulling direction, i.e., a groove containing many parts extending along the width direction, is formed. Furthermore, when the slip prevention part is formed in a multi-stripe shape extending in the width direction of the absorbent article as described in Patent Document 1, the slip prevention part is likely to be interrupted in the front-to-rear direction, and the slip prevention part is likely to remain in the underwear.

[0007] Therefore, in view of the above, an object of one aspect of the present invention is to prevent an adhesive anti-slip portion from remaining on the underwear when the absorbent article is peeled off from the underwear. [Means for solving the problem]

[0008] A first aspect of the present invention is an absorbent article comprising a liquid-permeable top sheet on the skin side, a liquid-impermeable back sheet on the non-skin side, and an absorbent body disposed between the top sheet and the back sheet, and having a front-to-rear direction corresponding to the front-to-rear direction of a wearer's body and a width direction perpendicular to the front-to-rear direction, wherein at least one continuous groove recessed from the non-skin side to the skin side is formed in the absorbent body, and a plurality of adhesive slip prevention parts having a width direction length longer than the front-to-rear direction length are provided at intervals in the front-to-rear direction on the non-skin side of the back sheet for fixing the absorbent article to an undergarment, Each continuous groove has a shape having two or more convex portions toward the front of the continuous groove and / or two or more convex portions toward the rear of the continuous groove, the continuous groove has a virtual region having a unit length in the front-to-rear direction and the same widthwise length as the absorbent body, and the continuous groove has a groove portion that does not include a center line extending along the front-to-rear direction in a planar view, and the anti-slip portion overlaps with the continuous groove in the width direction and includes the groove portion in the front-to-rear direction in a planar view, or does not overlap the groove portion.

[0009] According to the first aspect, even if a continuous groove appearing on the non-skin side (back sheet side) of the absorbent article has a specified groove portion having two or more protrusions facing forward and / or two or more protrusions facing backward and containing a large widthwise component, it is possible to prevent or reduce the adhesive anti-slip portion from remaining on the underwear by overlapping the groove portion in a specified arrangement in a planar view, or by not overlapping the anti-slip portion with the groove portion in a planar view.

[0010] In the former case where the slip prevention part is overlapped with the predetermined groove part, the slip prevention part is extended so as to include the continuous groove in the width direction and the groove part in the front-rear direction in a plan view. Therefore, the slip prevention part is arranged in front and behind the groove part of the continuous groove, so that the cohesive force of the material of the slip prevention part can work in the front-rear direction across the groove part. Therefore, when the absorbent article is peeled off from the underwear in the front-rear direction (for example, from the front to the rear), even if the adhesiveness between the slip prevention part facing the groove part, which is a part of the continuous groove, and the back sheet is weakened, the slip prevention part arranged facing the front and rear parts of the groove part (parts where no groove is formed) and maintaining adhesiveness with the back sheet can drag the slip prevention part arranged facing the predetermined groove part, so that the slip prevention part can be reduced or avoided from being separated from the back sheet at the groove part and transferred to the underwear. In addition, because the anti-slip portion is arranged to include one continuous groove in the width direction, the cohesive force of the anti-slip portion is likely to act in the width direction as well, preventing the anti-slip portion from being interrupted at a position opposite the continuous groove and remaining in the underwear.

[0011] Furthermore, in the latter case where the anti-slip portion does not overlap the specified groove portion, the anti-slip portion does not face the groove portion in the first place, so there is no concern that the anti-slip portion will transfer from the backsheet to the underwear.

[0012] In a second aspect of the present invention, the one anti-slip portion includes the entirety of the one continuous groove in plan view.

[0013] According to the second aspect, since the slip prevention portion includes one continuous groove in a plan view, an area that does not face the groove can be extended around the predetermined groove portion. Since the cohesive force of the material of the slip prevention portion works because the slip prevention portion is continuous in the surface direction, the above configuration allows the cohesive force of the material of the slip prevention portion to work over a wider range. Therefore, when the absorbent article is peeled off from the underwear, it is further prevented that the slip prevention portion is interrupted at the position of the predetermined groove portion and transferred to the underwear.

[0014] In a third aspect of the present invention, the one anti-slip portion has a length in the front-rear direction of 7 to 50 mm.

[0015] According to the third aspect described above, since the anti-slip portion has a predetermined length in the front-to-rear direction, the effect of the anti-slip portion portion facing the continuous groove being drawn to the succeeding anti-slip portion portions that do not face the continuous groove is improved, and since the anti-slip portion is not too long in the front-to-rear direction, the possibility of impairing the flexibility of the absorbent article is reduced.

[0016] In a fourth aspect of the present invention, the one anti-slip portion extends forward or backward beyond the groove portion by a distance equal to or greater than the front-rear length of the groove portion.

[0017] According to the fourth aspect, the anti-slip portion arranged before and after the specified groove portion can pull along the anti-slip portion opposite the groove portion, thereby further enhancing the effect of preventing the anti-slip portion from remaining in the underwear.

[0018] In a fifth aspect of the present invention, the continuous groove has a shape corresponding to a compressed groove formed on the skin side.

[0019] According to the fifth aspect, the continuous groove is a groove formed on the non-skin side in accordance with the shape of the compressed groove formed on the skin side of the absorbent article (fit embossing), and therefore the depth is kept shallow. Even with such a shallow groove, if a slip prevention part is arranged on the non-skin side of the absorbent article, air bubbles may be trapped, etc., and a gap may be formed between the back sheet and the slip prevention part. However, by providing the slip prevention part in a predetermined arrangement as described above in the first aspect, it is possible to prevent the slip prevention part from remaining in the underwear. Since most absorbent articles have a compressed groove formed on the skin side, this aspect can address the problem of the slip prevention part of many absorbent articles remaining in the underwear.

[0020] In a sixth aspect of the present invention, the absorbent article has a bodily fluid discharge outlet facing portion that faces the bodily fluid discharge outlet of the wearer, and the single continuous groove is formed at least forward of the bodily fluid discharge outlet facing portion.

[0021] When removing the absorbent article from the underwear, many users grasp the front of the absorbent article and peel it backwards, and the peeling action at the front tends to be a sudden action at the start of peeling, which makes it easy for the slip prevention part to remain on the underwear. According to the sixth aspect, at least the slip prevention part and the continuous groove arranged at the front have the positional relationship according to the first aspect, so that the effect of this aspect is more effectively exhibited. Effect of the Invention

[0022] According to one aspect of the present invention, when the absorbent article is peeled off from the underwear, the adhesive anti-slip portion can be prevented from remaining on the underwear. [Brief description of the drawings]

[0023] [Figure 1] 1 is a plan view of an absorbent article according to one embodiment of the present invention, viewed from the skin side. [Diagram 2] 1 is a plan view of an absorbent article according to one embodiment of the present invention, viewed from the non-skin side. [Diagram 3] 2 is a cross-sectional view taken along line II in FIG. 1. [Figure 4] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Diagram 5] FIG. 1 is a diagram for explaining a conventional technique. [Figure 6] FIG. 3 is a partially enlarged view of FIG. 2, illustrating a predetermined groove portion. [Figure 7] FIG. 11 is a plan view of an absorbent article according to a modified example, as viewed from the skin side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same reference numerals, and the description thereof may be omitted unless otherwise specified.

[0025] <Basic structure of absorbent articles> Fig. 1 shows a plan view of an absorbent article 1 according to one embodiment of the present invention, as viewed from the skin side, i.e., the side that faces the skin of a wearer when the absorbent article 1 is worn. Fig. 2 shows a plan view of the absorbent article 1 as viewed from the opposite side to Fig. 1, i.e., the side that faces underwear when worn (non-skin side). Fig. 3 shows a schematic cross-sectional view taken along line II in Fig. 1, and Fig. 4 shows a schematic cross-sectional view taken along line II-II in Fig. 1.

[0026] As shown in Figs. 1 to 4, the absorbent article 1 may have a structure including a liquid-permeable top sheet on the skin side, a liquid-impermeable back sheet 2 on the non-skin side, and an absorbent body 4 disposed between these sheets 2 and 3. Thus, the absorbent article 1 is generally in the form of a flat pad. Specifically, the absorbent article 1 may be a sanitary napkin, a panty liner (discharge sheet), a light incontinence pad, etc., but is preferably used as a sanitary napkin. In this specification, a sanitary napkin will be used as an example.

[0027] As shown in Fig. 1 and Fig. 2, the absorbent article 1 may have a front-rear direction D1 that is aligned with the front-rear direction of the wearer's body when worn, and a width direction D2 that is perpendicular to the front-rear direction D1. In this embodiment, the absorbent article 1 has an elongated shape in a plan view, and the front-rear direction D1 of the absorbent article 1 is the longitudinal direction, and the width direction D2 is the lateral direction. The total length of the absorbent article 1 (the length in the front-rear direction D1) may be 140 to 420 mm. In addition, the width of the absorbent article 1 (the length in the width direction D2, excluding wings or flaps extending from the sides, if any) may be 50 to 130 mm.

[0028] 1, when a center line (front-rear center line) CL is drawn along the front-rear direction D1 in a plan view, the absorbent article 1 has a shape that is approximately line-symmetrical about the center line, but the shape does not have to be line-symmetrical. Furthermore, configurations other than the shape of the absorbent article 1 (including the density and material of the absorbent body 4, the shape and size of the compressed grooves, the shape and size of the slip prevention parts, etc.) may also be approximately symmetrical or asymmetrical about the front-rear center line CL.

[0029] The back sheet 2 may be a sheet having at least water impermeability, for example, a sheet made of an olefin resin such as polyethylene or polypropylene. A laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, or a laminated sheet of nonwoven fabric in which a waterproof film is interposed to ensure substantial liquid impermeability, may also be used. In addition, it is more preferable to use a sheet having moisture permeability from the viewpoint of preventing stuffiness. As such a water impermeable / moisture permeable sheet material, a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching the sheet in a uniaxial or biaxial direction may be used.

[0030] The top sheet 3 can be a sheet that allows bodily fluids such as menstrual blood, vaginal discharge, and urine to pass through. As the top sheet 3, a nonwoven fabric with or without holes, a porous plastic sheet, or the like is preferably used. As the material fiber constituting the nonwoven fabric, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cupra, and blended fibers thereof, and natural fibers such as cotton can be used alone or in combination of two or more kinds. In addition, examples of processing methods for nonwoven fabric include the spunlace method, the spunbond method, the thermal bond method, the meltblown method, and the needle punch method. Among these processing methods, the spunlace method is preferred in that it can produce a nonwoven fabric that is flexible, and the spunbond method is preferred in that it can produce a nonwoven fabric that is rich in drapeability, and the thermal bond method is preferred in that it can produce a bulky and soft nonwoven fabric. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers, in which a fiber with a high melting point is used as the core and a fiber with a low melting point is used as the sheath, can also be used.

[0031] The absorbent body 4 is not limited to any material that can absorb and retain body fluids, but preferably contains cotton-like pulp and a water-absorbing polymer. As the water-absorbing polymer, superabsorbent polymer granular powder (superabsorbent polymer (SAP)), superabsorbent fiber (SAF)), and combinations thereof can be used. As the pulp, chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate can be used. As the raw material for chemical pulp, hardwoods and softwoods are used, with softwoods being preferred due to their long fiber length.

[0032] Synthetic fibers may be mixed into the absorbent 4. As synthetic fibers, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof may be used, and two of these may be mixed and used. In addition, composite fibers such as core-sheath type fibers with a fiber having a high melting point as the core and a fiber having a low melting point as the sheath, side-by-side type fibers, and split type fibers may also be used. Hydrophobic fibers may be surface-treated with a hydrophilizing agent to give them affinity for body fluids. The absorbent 4 is preferably manufactured by stacking or air-laid methods.

[0033] The absorbent body 4 may be one in which the main body of the absorbent body 4 is wrapped in an envelope sheet made of crepe paper, nonwoven fabric, or the like. By providing the absorbent body 4 with an envelope sheet, it is possible to prevent the absorbent body 4 from twisting or cracking, and to maintain its shape. The envelope sheet may be uncolored (i.e., white) crepe paper or nonwoven fabric, or it may be colored (for example, colored in a similar color to the color of the body fluid or a color complementary to the color of the body fluid). By using a colored envelope sheet, it is possible to make the absorption of body fluid by the absorbent body 4 less noticeable.

[0034] The absorbent body 4 may have a planar shape of an elongated shape having a substantially constant width as shown in Fig. 1. The width of the absorbent body 4 may vary along the front-rear direction D1, but an absorbent body 4 having a substantially constant width is preferred because the manufacturing apparatus does not become complicated. The absorbent body 4 may have a uniform thickness over the entire surface as a whole, but the thickness of the absorbent body 4 does not have to be uniform, and may be locally thin or thick. For example, the absorbent article 1 may be formed so as to fit closer to the body by increasing the thickness of the body fluid discharge outlet facing portion Q, which faces the body fluid discharge outlet of the wearer when worn, and the surrounding area.

[0035] At both ends of the absorbent body 4 in the front-rear direction D1, the edges of the back sheet 2 and the edges of the top sheet 3 may be joined by adhesive, heat sealing, etc. Furthermore, on both sides of the absorbent article 1, i.e., on both sides in the width direction D2, a pair of side sheets 7, 7 are arranged on the skin side (top sheet 3 side) along the front-rear direction D1.

[0036] The side sheet 7 may be made of a nonwoven fabric material that has been subjected to an appropriate water-repellent or hydrophilic treatment depending on the purpose of preventing penetration of bodily fluids or improving the feel against the skin. The material of the side sheet 7 may be natural fiber, synthetic fiber, regenerated fiber, etc. Furthermore, when the side sheet 7 is subjected to a water-repellent treatment, a silicone-based, paraffin-based, or other water-repellent agent may be used for the treatment. The absorbent article may have a configuration in which the top sheet 3 extends to the end of the absorbent article 1 in the width direction D2 and is joined to the back sheet 2 without using the side sheet 7.

[0037] Although the absorbent article 1 in the illustrated embodiment does not have wings, the absorbent article 1 may have a pair of wings extending from both sides near the bodily fluid discharge opening facing portion Q. The wings can be formed by joining an extending portion of the side sheet 7 and an extending portion of the back sheet 2 together.

[0038] <Slip prevention part> As shown in Figs. 1 to 4, the back sheet 2 side of the absorbent article 1 is provided with slip prevention parts (9F1, 9F2, 9M, 9B1, 9B2) for reliably fixing the absorbent article 1 to an undergarment when worn and preventing the absorbent article 1 from slipping. The slip prevention parts are preferably adhesive. The adhesive slip prevention parts are formed, for example, by applying a fluid adhesive or by attaching a preformed adhesive layer (adhesive tape, etc.). The adhesive used as the slip prevention parts can be a known adhesive, for example, a hot melt type adhesive. The main components thereof include a styrene polymer, a tackifier, a plasticizer, and a combination of these.

[0039] Examples of the styrene-based polymer include styrene-ethylene-butylene-styrene block copolymer, styrene-butylene-styrene block copolymer, styrene-isobutylene-styrene copolymer, styrene-butadiene-styrene block copolymer, etc., and one or more of these can be used. In addition, the tackifier and plasticizer can be solid at room temperature. Examples of the tackifier include C5-based petroleum resin, C9-based petroleum resin, dicyclopentadiene-based petroleum resin, rosin-based petroleum resin, polyterpene resin, terpene phenol resin, etc. Examples of the plasticizer include monomer plasticizers such as triflesil phosphate, dibutyl phthalate, and dioctyl phthalate, as well as polymer plasticizers such as vinyl polymers and polyesters.

[0040] As shown in Figures 1 and 2, a plurality of anti-slip portions are formed. Each anti-slip portion extends along the width direction D2 and is spaced apart in the front-rear direction D1. Each anti-slip portion has a length in the width direction D2 that is longer than its length in the front-rear direction D1. Such anti-slip portions arranged along the width direction D2 can prevent the anti-slip portions from peeling off from the underwear when force is applied from both legs. Furthermore, since a plurality of anti-slip portions are provided spaced apart in the front-rear direction D1, the absorbent article 1 is not prevented from curving in the front-rear direction D1 to fit the shape of the body when worn.

[0041] The slippage prevention portions may include front slippage prevention portions 9F1, 9F2 formed at the front of the absorbent article 1, rear slippage prevention portions 9B1, 9B2 formed at the rear, and central slippage prevention portions 9M, 9M, ... formed between them. In the example shown in Figures 1 and 2, the multiple slippage prevention portions have the same length in the width direction D2, but the length in the front-to-rear direction D1 of the front slippage prevention portions 9F1, 9F2 and the rear slippage prevention portions 9B1, 9B2 is longer than the length in the front-to-rear direction D1 of each of the central slippage prevention portions 9M, 9M, .... This allows the front and rear ends of the absorbent article 1 to be more reliably fixed to the underwear, and also maintains the flexibility of the central region in the front-to-rear direction D1, which curves more greatly when worn.

[0042] The basis weight of the slip prevention portion can be 20 to 50 gsm. The basis weight of the multiple slip prevention portions may be the same or different. However, it is preferable that the basis weight within each slip prevention portion is uniform so that the manufacturing process is not complicated.

[0043] <Groove on non-skin side> In this embodiment, as shown in Figs. 2 to 4, the absorbent article 1 has a groove recessed from the non-skin side to the skin side. The groove may be a portion of the absorbent body 4, or the absorbent body 4 and the back sheet 2 recessed toward the skin side. In other words, the groove recessed from the non-skin side to the skin side includes a state in which the absorbent body 4 is recessed and the back sheet 2 is recessed following the recess, and also includes a state in which the back sheet 2 is stretched almost flat on the non-skin side of the absorbent body 4, but may fall along the recess of the absorbent body 4 and become a recess when some force is applied. Such a groove may be formed in advance when the absorbent body 4 is stacked, or may be formed by squeezing the absorbent body 4, or both the absorbent body 4 and the back sheet 2, or both the top sheet 3, the absorbent body 4, and the back sheet 2 from the non-skin side. Furthermore, the grooves on the non-skin side may be formed by distorting the non-skin side portion with the deformation of the skin side when the absorbent body 4, or both the absorbent body 4 and the back sheet 2, or both the top sheet 3, the absorbent body 4, and the back sheet 2, are compressed from the skin side. In many absorbent articles, compressed grooves recessed from the skin side to the non-skin side are formed in the absorbent body 4 for the purpose of promoting deformation along the body when worn and controlling the transfer of bodily fluids. Such compressed grooves on the skin side can be formed, for example, by passing the absorbent body 4, or a laminate including the top sheet 3 and the absorbent body 4, or a laminate including the top sheet 3, the absorbent body 4, and the back sheet 2 between a roll having a protrusion corresponding to the shape of a predetermined compressed groove and a roll facing the roll with a smooth surface, with the roll having the protrusion facing the skin side.

[0044] In this manner, the non-skin side grooves in this embodiment may be grooves formed on the non-skin side in association with the formation of typical compressed grooves by squeezing from the skin side, in which case the depth of the non-skin side grooves is shallower than the compressed grooves formed on the skin side (FIGS. 3 and 4).

[0045] As shown in FIG. 1, a plurality of compressed grooves are formed on the skin side. The number, shape, size, and arrangement of the compressed grooves are appropriately determined depending on the application of the absorbent article 1. In the example shown in FIG. 1, a central compressed groove 11 is formed as the compressed groove, which is a closed ellipse that is long in the front-rear direction D1 and is formed in the center of the front-rear direction D1. A front first compressed groove 12 close to the front end and a front second compressed groove 13 located behind the front first compressed groove 12 are formed in front of the central compressed groove 11. A rear first compressed groove 14 close to the rear end and a rear second compressed groove 15 located ahead of the rear first compressed groove 14 may be formed behind the central compressed groove 11. In this example, the front first compressed groove 12 and the rear first compressed groove 14 have front-rear symmetrical shapes, and the front second compressed groove 13 and the rear second compressed groove 15 have front-rear symmetrical shapes. Furthermore, the combined shape of the front first compressed groove 12 and the front second compressed groove 13 and the combined shape of the rear first compressed groove 14 and the rear second compressed groove 15 are symmetrical from front to back.

[0046] The front first compressed groove 12 is one continuous compressed groove. The front first compressed groove as a whole has a shape of the number 8 with the top and bottom directions arranged along the width direction D2 (or an infinity symbol). In other words, it has a shape of two ellipses arranged in the width direction D2 and joined at the center of the width direction D2. Meanwhile, the front second compressed groove 13 is composed of a pair of compressed grooves spaced apart in the width direction D2.

[0047] The compression groove may have a low compression section and a high compression section that is compressed deeper than the low compression section, as shown in Fig. 1. In Fig. 1, the low compression section is shown in white, and the high compression section is shown in black. As shown in Fig. 1, the high compression section may be formed intermittently within the low compression section.

[0048] As described above, by forming compressed grooves on the skin side as shown in Fig. 1, grooves corresponding to the shapes of the compressed grooves on the skin side are also formed on the non-skin side. Thus, as shown in Fig. 2, on the non-skin side of the absorbent article 1, a central groove 11a, a front first groove 12a, a front second groove 13a, a rear first groove 14a, and a rear second groove 15a are formed, which have shapes corresponding to the above-mentioned central compressed groove 11, front first compressed groove 12, front second compressed groove 13, rear first compressed groove 14, and rear second compressed groove 15, respectively.

[0049] 2, the slip prevention portion is formed to overlap the groove. In the illustrated example, the slip prevention portion overlaps a part or the whole of the central groove 11a, the front first groove 12a, the front second groove 13a, the rear first groove 14a, and the rear second groove 15a.

[0050] Here, if an adhesive slip-stopper is provided on the non-skin side of the absorbent article 1 where the groove is formed, the slip-stopper may not be able to contact the groove part partially or entirely, resulting in a gap between the back sheet 2 and the slip-stopper. For the sake of explanation, Fig. 3 and Fig. 4 show a state where a gap is formed between the entire front first groove 12a and the slip-stopper 9F1, but the gap between the back sheet 2 and the slip-stopper may not be formed over the entire groove, but may be formed only in a part or a small part of the groove. In that case, small air bubbles may be trapped between the back sheet 2 and the slip-stopper.

[0051] In this way, when a groove is formed on the non-skin side of the absorbent article 1, a portion where the back sheet 2 and the slippage prevention portion are not in direct contact with each other is likely to occur. This reduces the adhesive strength of the slippage prevention portion. Therefore, in the case of an absorbent article 1' according to the prior art that has a non-skin side groove 10a' and a slippage prevention portion 9' that do not have the specific arrangement relationship according to this embodiment (FIG. 5(a)), when an attempt is made to peel off the absorbent article 1' that has been attached to the underwear S when worn from the underwear S, the slippage prevention portion 9' may be pulled toward the underwear and broken at a location where the adhesive strength between the underwear S and the slippage prevention portion 9' is greater than the adhesive strength between the back sheet 2' and the slippage prevention portion 9'. Therefore, a part of the slippage prevention portion may remain on the underwear S as a slippage prevention portion piece r (FIG. 5(b)). Considering that the direction in which the absorbent article 1 is peeled off is the front-to-back direction D1 (e.g., from the front), this phenomenon (also called glue residue) is likely to occur when the anti-slip portion overlaps a groove having a shape extending in the width direction D2 perpendicular to the front-to-back direction D1, or a groove that contains a large component in the width direction D2.

[0052] In response to this, the inventors have found that it is possible to prevent the slip prevention part from remaining on the underwear (preventing the glue residue phenomenon) by devising the arrangement of the slip prevention part for a groove containing a large amount of components in the width direction D2, or for a specific groove part in such a groove containing a large amount of components in the width direction D2. That is, in this embodiment, when the slip prevention part is overlapped with the groove on the non-skin side, the slip prevention part is arranged so as to include the groove part in the front-rear direction D1 containing a large amount of components in the width direction D2 in the front-rear direction D1 in a plan view. This allows the slip prevention part to be arranged in front and behind the groove, so that the cohesive force of the material of the slip prevention part can be exerted from the front to the rear across the groove. Therefore, even if the adhesive force between the back sheet 2 and the slip prevention part is weakened at the position where the groove is formed, the slip prevention part parts in front and behind the groove that do not face the groove can drag the slip prevention part parts arranged facing the groove by the cohesive force of the slip prevention part material, and the slip prevention part can be prevented from remaining on the underwear without being divided in the groove.

[0053] Here, the determination of the above-mentioned groove portion will be described with reference to Fig. 6. Fig. 6 shows an enlarged view of the portion in Fig. 2 where the front first groove 12a and the front second groove 13a are formed. As described above, the front first groove 12a is one continuous groove including two elliptical rings having a major axis in the width direction D2. That is, this one continuous groove (front first groove 12a) has a shape having two or more convex portions toward the front of the continuous groove and two or more convex portions toward the rear of the continuous groove.

[0054] Furthermore, as shown in Fig. 6, in the continuous groove (front first groove 12a) having the specific shape, a virtual area IA having a unit length in the front-rear direction D1 and the same widthwise length as the absorbent body overlaps with one continuous groove 12a by 3% or more and does not include the front-rear centerline CL in a plan view, and this area is defined as a predetermined groove portion pg. In Fig. 6, the predetermined groove portion pg is shown in black. From the viewpoint of ensuring the flexibility of the absorbent body 4, it is preferable that the area where the virtual area IA overlaps with one continuous groove 12a is 30% or less. For example, in one continuous groove (e.g., the front first groove 12a), when a rectangular imaginary area IA having a length in the front-rear direction D1 equal to or greater than the groove width of the continuous groove and having both ends in the width direction D2 at both ends of the absorbent body 4 is overlapped with one continuous groove, if there is a groove portion pg whose overlapping area with the imaginary area IA is 3% or more of the area of ​​the imaginary area IA, the slippage prevention portion 9F1 may be formed to include the groove portion pg in the front-rear direction D1 in a plan view. However, the groove portion pg does not include the front-rear center line CL in a plan view. In addition, the length in the width direction D2 of the groove portion pg may be greater than the groove width of one continuous groove, and may preferably be twice or more the groove width of one continuous groove.

[0055] The number of groove portions pg present in one continuous groove can be two or more as shown in FIG. 6, but may be one.

[0056] In this embodiment, one slip prevention portion is formed in a predetermined groove portion of the continuous groove so as to include the groove portion in the front-rear direction D1. Furthermore, as shown in Fig. 6, for example, it is preferable that the slip prevention portion 9F1 is formed to include the groove portion pg in the front-rear direction D1 so as to extend beyond the groove portion pg forward and backward by a length equal to or greater than the length of the groove portion pg of the groove 12a in the front-rear direction D1 or the width of the groove.

[0057] In this way, the slip prevention parts extend in the front-to-rear direction D1 in front of and behind a given groove part pg by a length equal to or greater than the length of the groove part pg in the front-to-rear direction D1, so that when the absorbent article 1 is peeled off from the underwear, for example from front to rear, the parts of the slip prevention part in front of and behind the groove part pg that do not face the groove can drag along the parts of the slip prevention part that face the groove, further preventing the slip prevention part from remaining in the underwear. Here, the length of the part of the slip prevention part that extends forward from the front end of the groove part pg or the length of the part that extends backward from the rear end of the groove part pg may be preferably 0.8 to 2.5 mm, more preferably 1.0 to 2.0 mm.

[0058] 6, the slip prevention portion 9F1 overlapping the groove portion pg in the front-rear direction D1 overlaps the continuous groove 12a in the width direction D2. In other words, when the slip prevention portion 9F1 and the groove portion pg overlap, the continuous groove 12a does not protrude from the slip prevention portion 9F1 in the width direction D2 in a plan view. This allows the cohesive force of the material of the slip prevention portion to act in the width direction D2 as well, which enhances the effect of pulling along the portion of the slip prevention portion that faces the predetermined groove portion pg and has weak adhesive force to the backsheet 2 when the absorbent article 1 is peeled off from the underwear.

[0059] On the other hand, in this embodiment, the slip prevention portion may be formed so as not to overlap the predetermined groove portion pg at all in a plan view. If the slip prevention portion does not overlap the groove portion pg at all in the first place, the above-mentioned problem of the slip prevention portion remaining (glue residue) on the underwear does not occur. For example, the rear first groove 14a in FIG. 2 has a shape similar to the front first groove 12a, and the slip prevention portion 9B1 is overlapped. However, the slip prevention portion 9B1 is not overlapped on the side (front side) of the rear first groove 14a closer to the center in the front-rear direction D1. Therefore, in the rear first groove 14a, there is no concern that glue residue (FIG. 5(b)) will occur in the predetermined groove portion pg closer to the center in the front-rear direction D1.

[0060] In this embodiment, the relationship between the slip prevention part and the non-skin side continuous groove, in which one slip prevention part is arranged to include one continuous groove in the width direction D2 and to include a predetermined groove portion pg in the front-rear direction D1 in a plan view, or does not overlap with the groove portion pg, may be formed in any region of the absorbent article 1, but is preferably formed in the front of the absorbent article 1, particularly in front of the bodily fluid discharge port facing portion Q. That is, the above relationship, i.e., the relationship to include one continuous groove in the width direction D2 and to include a predetermined groove portion pg in the front-rear direction D1, or does not overlap with the groove portion pg, is preferably formed in at least the front first groove 12a in the example shown in Fig. 2. When peeling the absorbent article 1 from the underwear, most users peel it off from the front, so that a strong force is easily applied suddenly during the peeling action in the front, which increases the possibility that the cohesive force of the slip prevention part will be broken and the slip prevention part will remain in the underwear. Therefore, by forming a continuous groove in the forward direction that has the above-mentioned predetermined positional relationship with the anti-slip portion, the above-mentioned adhesive residue can be effectively avoided.

[0061] In order to prevent the slip-stopper from remaining on the underwear, it is possible to increase the basis weight of the adhesive slip-stopper or to widen the application range of the slip-stopper, for example, to apply it to the entire surface of the back sheet 2. This is because increasing the basis weight of the slip-stopper or widening the application range of the slip-stopper improves the cohesive force in the surface direction of the slip-stopper, and prevents the slip-stopper from being interrupted. However, increasing the basis weight of the slip-stopper may increase costs or impair the flexibility of the absorbent article, affecting the fit. Therefore, in this embodiment, the slip-stopper is formed in a predetermined position with respect to the continuous groove, or is not overlapped with a predetermined groove portion that contains a large amount of components in the width direction D2, thereby preventing glue from remaining without changing the basis weight and application range of the slip-stopper.

[0062] The length in the front-rear direction D1 of one slip prevention part depends on the length in the front-rear direction D1 of a given groove portion pg of the continuous groove, but is preferably 7 to 50 mm. By setting the length in the front-rear direction D1 of the slip prevention part within the above range, it is possible to maintain the flexibility of the absorbent article 1 while achieving the above-mentioned effect of preventing glue residue.

[0063] <Modifications of absorbent articles> FIG. 7 shows a plan view of an absorbent article 1A according to a modified example, seen from the skin side. The configuration of the absorbent article 1A is basically the same as that of the absorbent article 1 (FIG. 1), but differs from the absorbent article 1 in the size of the absorbent article and the arrangement of the slippage prevention parts in the central region in the front-rear direction D1. The absorbent article 1A is slightly longer in size than the absorbent article 1. In addition, in the absorbent article 1A, the front slippage prevention parts 9F1, 9F2 and the rear slippage prevention parts 9B1, 9B2 are arranged in the same manner as those in the absorbent article 1, but the length in the width direction D2 of the central slippage prevention parts 9M, 9M, ... is smaller than the front slippage prevention parts 9F1, 9F2 and the rear slippage prevention parts 9B1, 9B2. Therefore, it is preferable in that it has high flexibility in the central region in the front-rear direction D1.

[0064] Furthermore, in absorbent article 1A, central anti-slip portions 9M, 9M, ... do not overlap central compressed groove 11 in plan view, and are arranged so as not to overlap the central groove (not shown) on the non-skin side. Therefore, in this example, in addition to the effect obtained with absorbent article 1 (FIG. 1), the anti-slip portions are less likely to remain in the underwear, even near the area where central compressed groove 11 is formed.

[0065] <About manufacturing> The method for providing the slip prevention portion on the back sheet 2 is not particularly limited, but can be performed by applying a liquid adhesive using a coating device such as a gravure coater, a spray coater, a spiral gun, a bead gun, etc. In this case, the adhesive is discharged from a coating device that is fixed in position onto the absorbent article 1 that is transported in the width direction D2 of the absorbent article 1 by a transport means such as a belt conveyor, thereby forming a slip prevention portion extending along the width direction D2.

[0066] Also, instead of applying the adhesive to the back sheet 2, the adhesive can be applied to a packaging sheet or a release sheet that will face the back sheet 2 during individual packaging, and then the back sheet 2 of the absorbent article 1 can be arranged to face the packaging sheet or release sheet. Here, by subjecting the packaging sheet or release sheet to a release treatment, the adhesive is transferred to the back sheet 2 of the absorbent article 1 when the absorbent article 1 is peeled off from the packaging sheet or release sheet during use, so that it can function as an anti-slip portion.

[0067] Furthermore, when an adhesive is applied to the release sheet, it is also possible to place only the back sheet 2 on the release sheet to which the adhesive has been applied, and then place a laminate of the absorbent body 4 with the compressed grooves formed therein and the top sheet 3 to complete the absorbent article 1. In this case, even if the laminate of the absorbent body 4 and the top sheet 3 is compressed from the skin side, it is preferable because it is less likely to result in a gap being formed between the slip prevention portion and the back sheet 2. [Explanation of symbols]

[0068] 1. 1A Absorbent articles 2 Back seat 3 Top sheet 4. Absorber 7 Side seat 9, 9F1, 9F2, 9B1, 9B2, 9M Adhesive anti-slip part 11 Central compression groove 12 Front first compression groove 13 Front second compression groove 14 Rear first compression groove 15 Rear second compression groove 11a center groove 12a Front first groove 13a Front 2nd groove 14a Rear first groove 15a Rear 2nd groove D1 Anteroposterior direction D2 Width direction pg A given groove portion in a continuous groove Q Opposite body fluid outlet

Claims

1. An absorbent article comprising a liquid-permeable top sheet on the skin side, a liquid-impermeable back sheet on the non-skin side, and an absorbent body disposed between the top sheet and the back sheet, the absorbent article having a front-to-rear direction corresponding to the front-to-rear direction of a wearer's body and a width direction perpendicular to the front-to-rear direction, At least one compressed groove recessed from the skin side to the non-skin side is formed in the absorbent body, and at least one continuous groove recessed from the non-skin side to the skin side and having a shape corresponding to the at least one compressed groove is formed; a plurality of adhesive slip prevention portions having a width direction length longer than a front-rear direction length for fixing the absorbent article to an undergarment are provided at intervals in the front-rear direction on the non-skin side of the back sheet; each continuous groove extends across a center line extending along the front-rear direction, exceeding half or more of the width direction length of the absorbent body, has a shape including an elliptical ring having a major axis in the width direction on both sides of the center line, and has a shape having two or more convex portions toward the front of the continuous groove and / or two or more convex portions toward the rear of the continuous groove; An absorbent article, wherein one of the plurality of anti-slip portions overlaps the one continuous groove so as to include the entirety of the one continuous groove in a plan view.

2. The absorbent article according to claim 1, wherein one of the plurality of anti-slip portions has a length in the front-rear direction of 7 to 50 mm.

3. a bodily fluid discharge outlet facing portion that faces a bodily fluid discharge outlet of a wearer; The absorbent article according to claim 1 or 2, wherein the one continuous groove is formed at least forward of the portion facing the bodily fluid discharge opening.

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