Extensible structure of disposable wearing article and panty-type disposable wearing article having the same

Abstract

The problem to be solved by the invention is to improve the cushioning of the stretchable structure in the wearing state. The above problem is solved by the following structure: In the stretchable region A2, continuous wavy linear joint regions 80 are intermittently arranged along the width direction WD and the front-rear direction LD. In each wavy linear joint region 80, the portion that does not intersect with the elastic member 15 is intermittently provided with a joint portion 81 for which the first piece 12S and the second piece 12H are fused. The portion that intersects with the elastic member 15 is a fixing portion 84 for fixing the elastic member 15 to the first piece 12S and the second piece 12H. The interval 90W between adjacent joint portions 81 in the width direction WD is 7 to 14 mm. The dimension 80W of the joint portion 81 in the width direction WD is 0.04 to 0.3 times the interval 90W. The total amplitude α of the side edge of the wavy linear joint region 80 is 0.2 to 0.7 times the interval 90W. The maximum elongation of the stretchable region A2 in the width direction WD is 200 to 240%.

Description

Technical Field

[0001] This invention relates to a stretchable structure for disposable clothing and a panty-type disposable clothing having the stretchable structure. Background Technology

[0002] In order to ensure a good fit to the body, most disposable diapers, disposable sanitary napkins, disposable diaper covers, and belt-type disposable diapers have a stretchable structure that extends along the width in the area including the waist.

[0003] A representative structure of this telescoping mechanism features an elongated elastic member positioned along the telescoping direction between the stacked first and second sheets. The first and second sheets form a planar telescoping area, covering and concealing the elastic member, which generates a force for elastic telescoping. When elongated along the telescoping direction, the elastic member is fixed to the first and second sheets at least at both ends of the telescoping area. In this telescoping mechanism, the first and second sheets contract along the telescoping direction due to the contractile force of the elastic member, and telescop and stretch between their natural length state (where folds (including wrinkled structures, hereinafter simply referred to as folds)) and their unfolded state (extended to the elastic elongation limit) as the elastic member elongates. From the elastic elongation limit where folds disappear, the first and second sheets contract together with the elastic member, causing the folds to converge, with the folds being most densely converged in their natural length state.

[0004] In such a stretchable structure, if the first and second pieces are free from each other, one piece may float partially or entirely relative to the other, resulting in unwanted wrinkles or expansion. Therefore, it is desirable for the first and second pieces to be joined directly or indirectly in a manner that extends over their entirety.

[0005] Furthermore, the joining pattern of the first and second pieces can sometimes affect the shape of the folds, and various joining patterns have been proposed to date. In a preferred joining pattern, continuous linear joining regions in a direction orthogonal to the stretching direction are intermittently arranged in the width direction, traversing the elastic member. The entire area between adjacent joining regions in the stretching direction is considered a non-jointing region. In the portions of each joining region that do not intersect with the elastic member, the joining portion where the first and second pieces are fused is arranged to be in close contact with at least both sides in the front-rear direction of each elastic member, and the portion that intersects with the elastic member is the fixing portion where the elastic member is fixed to the first and second pieces (see Patent Documents 1-4). In this case, since the joining and non-jointing portions connected by the joining and fixing portions are repeatedly formed in the width direction, when the pieces are contracted to a certain extent (including the natural length state and the wearing state), the portions of the first and second pieces located in the non-jointing regions expand in opposite directions, forming folds extending in a direction orthogonal to the stretching direction.

[0006] On the other hand, the stretchable structure with such pleats has the advantage of providing a soft feel when worn at its natural length; and it is also advantageous that the pleats act as a cushion between the elastic member and the skin when worn, making it difficult to leave marks on the skin.

[0007] However, in previous stretchable designs, there is room for improvement in cushioning during wear, even with some degree of stretching.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2016-067436

[0011] Patent Document 2: International Publication No. 2018 / 154684

[0012] Patent Document 3: Japanese Patent Application Publication No. 2020-199248

[0013] Patent Document 4: Japanese Patent No. 6794546 Summary of the Invention

[0014] The problem that the invention aims to solve

[0015] Therefore, the main objective of this invention is to improve the cushioning properties of the stretchable structure during wear.

[0016] Methods for solving problems

[0017] The above-mentioned problems are addressed through the following solutions.

[0018] <Option 1>

[0019] A telescopic structure for a disposable wearable article comprises a first piece, a second piece, and a plurality of elongated elastic members, the elastic members being spaced apart between the first and second pieces in an orthogonal direction orthogonal to the telescopic direction and extending along said telescopic direction, characterized in that... The telescopic structure has a telescopic region. In the telescopic region, continuous wavy linear joint regions are intermittently arranged along the telescopic direction, traversing the elastic member, and the entire area between adjacent wavy linear joint regions in the telescopic direction constitutes a non-jointed area. In each of the wavy linear joint areas, the portions that do not intersect with the elastic member are provided with joints where the first piece and the second piece are fused together, either discontinuously or continuously, along the orthogonal direction. The portions of each of the wavy linear joint areas that intersect with the elastic member constitute the fixing portions for securing the elastic member to the first piece and the second piece. The stretchable region is a region that contracts along the stretching direction due to the contraction of the elastic member and elastically stretches between its natural length state and its unfolded state. In its natural length state, the portions of the first and second pieces located in the non-joined region expand away from each other in opposite directions, forming continuous folds along the orthogonal direction. In its unfolded state, together with the elastic member, it stretches to its maximum elongation along the stretching direction, causing the folds to disappear. The interval between adjacent joints in the telescopic direction is 7~14 mm. The dimension of the joint in the telescopic direction is 0.04 to 0.3 times the interval between adjacent joints in the telescopic direction. The total amplitude of the side edge of the wavy linear joint region is 0.2 to 0.7 times the interval between adjacent joints in the expansion and contraction direction. The maximum elongation of the telescopic region in the telescopic direction is 200-240%.

[0020] (Effects)

[0021] In a telescopic structure where the non-jointed areas of the first and second pieces expand in opposite directions and form continuous folds along orthogonal directions, the height of the folds affects cushioning. Therefore, even in conventional telescopic structures, by increasing the spacing of the joints without changing their width, the folds become higher at the natural length, thereby improving cushioning. Furthermore, as a result, the cushioning is also improved to some extent when stretched to the wearing position. However, in conventional telescopic structures, the height of the folds decreases accordingly when stretched to the wearing position. Previously, this reduction in fold height in the wearing position was taken for granted, and no improvement was considered possible.

[0022] While researching various joining patterns, the inventors accidentally discovered a specific combination of conditions that could suppress the reduction of fold height when stretched to the wearing state. That is, in the stretchable structure of the above-described solution...

[0023] (a) The joint area is wavy; (b) The spacing between adjacent joints in the telescoping direction is 7 to 14 mm; (c) The dimension of the joint in the expansion and contraction direction is 0.04 to 0.3 times the interval between adjacent joints in the expansion and contraction direction; (d) The total amplitude of the side edge of the wavy linear joint region is 0.2 to 0.7 times the spacing between adjacent joints in the expansion and contraction direction; and (e) The maximum elongation of the expansion and contraction zone in the expansion and contraction direction is 200-240%; In such a combination of conditions, In its natural length state, the adjacent joints in the stretching direction do not approach each other, thus ensuring a certain degree of spacing. On either side or both sides of the stretching direction within this spacing, a thinner folded fold will form on one side of the base or between the bases, accompanied by a base that does not stand up to the extent of forming a fold.

[0024] This principle can be explained as follows: Considering the side edges of the first and second wavy linear joint regions currently in their unfolded state, the side edge of the first wavy linear joint region has a proximal peak protruding towards the second wavy linear joint region and a distal peak protruding in the opposite direction. Similarly, the side edge of the second wavy linear joint region has a proximal peak protruding towards the first wavy linear joint region and a distal peak protruding in the opposite direction. Furthermore, as the elastic member contracts, when the side edges of the first and second wavy linear joint regions approach each other in the expansion and contraction direction, forming folds in the first and second pieces, depending on their orthogonal positions, one upright position of the fold tends to produce a line connecting the proximal peaks of the first wavy linear joint region, or the other upright position of the fold tends to produce a line connecting the proximal peaks of the second wavy linear joint region, or both. As a result, on either side or both sides of the joint in the expansion direction, along with the base that has not risen to the point of forming a fold, a thinner fold will form on one side of the base or between the bases. Furthermore, the shape of the fold, when viewed from the thickness direction, is wavy along the center of the expansion direction of the non-jointed area.

[0025] When the folds at the base elongate along the stretching direction to reach the wearing state, the height reduction of the folds decreases until this bending occurs because the raised positions of the folds lift up and the boundary between the folds and the base opens. Furthermore, the shape of the folds, viewed from the thickness direction, is a wavy line along the center of the stretching direction of the non-jointed area, with only peaks at points orthogonal to the stretching direction. Therefore, the crushing effect of the folds in the thickness direction is difficult to transmit in the continuous direction of the folds. This means the folds are difficult to crush. Therefore, in the stretching structure of this design, by suppressing the height reduction of the folds in the wearing state and making the folds difficult to crush, the cushioning in the wearing state can be improved.

[0026] <Second Option>

[0027] According to the first embodiment of the telescopic structure of the disposable wearable item, in all the said wavy linear joint areas, the wavelength of the side edge is constant, the total amplitude of the side edge is twice the half amplitude and constant, and the acute angle between the center line with zero displacement of the side edge and the said orthogonal direction is 3 to 7 degrees.

[0028] (Effects)

[0029] The wavy joint area can also be triangular or similar, but if it is a regular and gently curving shape (such as a sine wave or arc shape that does not include straight lines), the base of the aforementioned folds will also be formed regularly, resulting in better cushioning when worn. Therefore, this is preferred. Furthermore, if the wavy joint area, as in this design, is slightly tilted relative to the orthogonal direction as a whole, the folds are less prone to crushing, further enhancing cushioning when worn.

[0030] <Third Option>

[0031] According to the first or second embodiment of the stretchable structure of the disposable wearable article, the joint where the first piece and the second piece are fused together covers the entirety of each of the wavy linear joint areas, and is intermittently arranged along the orthogonal direction at intervals shorter than the diameter of the elastic member at its natural length. The joint portion is closely connected to both sides of each elastic member in the orthogonal direction. In the fixing part, at least one of the first piece and the second piece is partially or entirely fused to the elastic member.

[0032] (Effects)

[0033] As in this solution, when the joints are intermittently arranged at very narrow intervals throughout the wavy joint area, hardening caused by welding can be suppressed, and the feel can be homogenized throughout each wavy joint area, forming smooth wavy wrinkles. Furthermore, by welding at least a portion or entirely of the first and second pieces to the elastic member in the fixing portion, the elastic member can be fixed more securely than when it is fixed solely by friction.

[0034] <Option 4>

[0035] A disposable underwear-type garment comprising: a ring-shaped waistband area formed by joining the sides of a front panel and the sides of a back panel; a middle region extending from the waistband area of ​​the front panel, through the crotch, to the waistband area of ​​the back panel; a waist opening located on the side of the waistband area opposite to the middle region; and leg openings located on both sides of the middle region in the width direction. This disposable underwear-type garment comprises: an outer body that at least forms the waist area; an inner body attached to the outer body in such a manner that it extends from the middle portion of the front panel in the width direction to the middle portion of the back panel in the width direction; and a side-sealing area formed by joining the inner surfaces of the two sides of the outer body in the front panel and the two sides of the outer body in the back panel together with their inner surfaces facing each other. The outer body of at least one of the front and back panels has a stretch structure in any of the first to third embodiments in a manner that extends throughout the width direction between the side sealing areas and in a manner that the stretch direction of the stretch area of ​​the stretch structure is the width direction of the underwear-type disposable wearable article.

[0036] (Effects)

[0037] The aforementioned elastic structure is suitable for the outer casing of disposable underwear-type garments.

[0038] <Fifth Plan>

[0039] According to the fourth embodiment of the disposable underwear-type garment, the outer body of the front panel and the outer body of the back panel, in the region between the side-sealing areas, have a portion or all of the stretchable structure of the second embodiment in the front-to-back direction, in a manner that extends throughout the width direction between the side-sealing areas. When viewed from the front surface in the product state with the inner surfaces of the front body piece and the rear body piece in natural contact, the center lines of the wavy line joint areas in the telescopic structure of the outer body of the front body piece and the center lines of the wavy line joint areas in the telescopic structure of the outer body of the rear body piece are inclined in opposite directions relative to the orthogonal direction.

[0040] (Effects)

[0041] As mentioned above, the wavy joint area of ​​the second option is particularly preferred. However, when applied to the side sealing area of ​​the outer body of a disposable underwear-type garment, when viewed from the front surface in the product state at the natural length where the inner surfaces of the front and back pieces are in contact, if the center lines of the wavy joint area in the telescopic structure of the outer body of the front piece and the center lines of the wavy joint area in the telescopic structure of the outer body of the back piece are inclined in the same direction relative to the orthogonal direction (front-back direction), then in the product state at the natural length where the inner surfaces of the front and back pieces are in contact, the side sealing areas in the outer bodies of the front and back pieces will deform into a parallelogram shape that is inclined in the same direction to either the left or right. As a result, the shape of the waist area viewed from the front surface also becomes the same, and the fit and left-right balance in appearance are disrupted.

[0042] In contrast, as in this solution, if the center lines of the wavy joint areas in the telescopic structure of the front body and the rear body are inclined in opposite directions relative to the orthogonal direction (front-back direction), then in the product state where the inner surfaces of the front and rear bodies are in contact at their natural lengths, the deformation between the side sealing areas in the front body and the rear body are in opposite directions. Although the side sealing areas are inclined in opposite directions to the left and right, the shape of the waist area viewed from the front surface is approximately rectangular. Therefore, the left-right balance of fit is good, and in addition to the inclination of the side sealing areas, the left-right balance of appearance is also good.

[0043] Invention Effects

[0044] According to the present invention, the cushioning properties of the stretchable structure in the wearing state can be improved. Attached Figure Description

[0045] Figure 1 This is a top view showing the inner surface of a disposable underwear-type diaper in its unfolded state.

[0046] Figure 2 This is a top view showing the outer surface of a disposable underwear-type diaper in its unfolded state.

[0047] Figure 3 yes Figure 1 Sectional view 2-2.

[0048] Figure 4 yes Figure 1 Sectional view 3-3.

[0049] Figure 5 (a) is Figure 1 Sectional view 4-4, and (b) is Figure 1 Sectional view 5-5.

[0050] Figure 6 This is a 3D diagram of a disposable underwear-style diaper.

[0051] Figure 7 It is a top view showing the outer surface of the interior and the outline of the exterior in the unfolded state.

[0052] Figure 8 It is a top view showing the main parts of the outer casing in its unfolded state, magnified.

[0053] Figure 9 yes Figure 8 Sectional view 6-6.

[0054] Figure 10 This is a top view showing an example of the shape of the wavy line joint area.

[0055] Figure 11 It shows Figure 2 Section 7-7, (a) is a sectional view of the natural length state, (b) is a sectional view of the worn state, and (c) is a sectional view of the unfolded state.

[0056] Figure 12 It shows Figure 2 Section 7-7, (a) is a sectional view of the natural length state, (b) is a sectional view of the worn state, and (c) is a sectional view of the unfolded state.

[0057] Figure 13 (a) is an exploded and assembled diagram of the front and rear outer components, and (b) is a perspective view that roughly shows the shape of the front and rear outer components in their natural length state.

[0058] Figure 14 (a) is an exploded and assembled diagram of the front and rear outer components, and (b) is a perspective view that roughly shows the shape of the front and rear outer components in their natural length state.

[0059] Figure 15 It is a top view showing the main parts of the outer casing in its unfolded state, magnified.

[0060] Figure 16 It is a top view showing the main parts of the outer casing in its unfolded state, magnified.

[0061] Figure 17 It is a top view showing the main parts of the outer casing in its unfolded state, magnified.

[0062] Figure 18 It is a top view showing the main parts of the outer casing in its unfolded state, magnified.

[0063] Figure 19 yes Figure 15 Enlarged view of the V section.

[0064] Figure 20 This is a cross-sectional view showing the layer structure in the side sealing region. Detailed Implementation

[0065] The following is a detailed description of a disposable diaper in the form of underwear, with reference to the accompanying drawings, as an example of such a disposable diaper. In addition to the fixing or joining parts described below, the structural members adjacent along the thickness direction can also be fixed or joined as needed, similar to those in known diapers. The dotted pattern in the cross-sectional view represents adhesives such as hot-melt adhesives used as fixing or joining methods. Hot-melt adhesives can be applied using known methods such as slit coating, continuous linear or dashed droplet coating, spiral, Z-shaped, wavy spraying, or patterned coating (transfer of hot-melt adhesives based on letterpress printing). Alternatively, in the fixing part of the elastic member, hot-melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Examples of hot-melt adhesives include EVA-based, adhesive rubber-based (elastic system), polyolefin-based, and polyester / polyamide-based adhesives, but they can be used without particular limitation. As a means of fixing or joining structural components, methods based on material fusion, such as heat sealing and ultrasonic sealing, can also be used. In areas where liquid permeability in the thickness direction is required, adjacent structural components along the thickness direction are fixed or joined in an intermittent pattern. For example, when using a hot-melt adhesive for such intermittent fixing or joining, spiral, Z-shaped, or wavy intermittent patterns can be appropriately used. When coating over a range greater than the width of a single nozzle, spiral, Z-shaped, or wavy intermittent patterns can be applied with or without spacing in the width direction. As a joining means of joining structural components, methods based on material fusion, such as heat sealing and ultrasonic sealing, can also be used.

[0066] Furthermore, the nonwoven fabric described below can be any known nonwoven fabric, depending on the application and purpose. As the structural fiber of the nonwoven fabric, in addition to synthetic fibers such as polyethylene or polypropylene (polyolefins), polyesters, and polyamides (including composite fibers such as core-sheath fibers as well as single-component fibers), rayon, cupro fibers, and natural fibers such as cotton can be selected without particular limitation, and these can also be mixed and used. To improve the softness of the nonwoven fabric, it is preferable to use crimped fibers as the structural fiber. Furthermore, the structural fiber of the nonwoven fabric can be a hydrophilic fiber (including fibers that become hydrophilic through a hydrophilizing agent), a hydrophobic fiber, or a waterproof fiber (including fibers that become waterproof through a waterproofing agent). In addition, nonwoven fabrics are generally classified according to fiber length, sheet formation method, fiber bonding method, and lamination structure into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermally bonded (hot air) nonwoven fabrics, needle-punched nonwoven fabrics, dot-bonded nonwoven fabrics, and laminated nonwoven fabrics (including SMS nonwoven fabrics and SMMS nonwoven fabrics with meltblown layers sandwiched between spunbond layers), etc., but any of these nonwoven fabrics can be used.

[0067] Figures 1-6 An underwear-type disposable diaper is shown. This underwear-type disposable diaper has a rectangular front outer body 12F constituting at least the waist portion of the front body piece F, a rectangular rear outer body 12B constituting at least the waist portion of the rear body piece B, and an inner body 200 disposed inside the outer bodies 12F and 12B in such a way that it extends from the front outer body 12F through the crotch to the rear outer body 12B. The two sides of the front outer body 12F and the two sides of the rear outer body 12B are joined to form a side sealing area 12A. Thus, the openings formed by the front and rear ends of the outer bodies 12F and 12B become waist openings WO for the wearer's waist and abdomen to pass through, and the portions on both sides of the inner body 200 in the width direction, which are surrounded by the lower edges of the outer bodies 12F and 12B and the side edges of the inner body 200, respectively, become leg openings LO for the legs to pass through. The inner body 200 is the part that absorbs and retains urine and other excrement, while the outer bodies 12F and 12B are the parts that support the inner body 200 relative to the wearer's body. Additionally, reference numeral Y indicates the total length of the diaper in its unfolded state (the length in the front-to-back direction from the edge We of the waist opening WO of the front panel F to the edge We of the waist opening WO of the back panel B), and reference numeral X indicates the total width of the diaper in its unfolded state.

[0068] This underwear-type disposable diaper has: a ring-shaped waistband region T, formed by joining the two sides of the front panel F and the two sides of the back panel B at the side-sealing region 12A; a middle region L, extending from the waistband region T of the front panel F through the crotch area to the waistband region T of the back panel B; a waist opening WO, located on the side of the waistband region T opposite to the middle region L; and leg openings LO, located on both sides of the width direction WD of the middle region L. In other words, the waistband region T is defined as being between two imaginary straight lines extending in the width direction through the edge of the waist opening WO and the upper end of the leg opening LO, respectively, and the middle region L is defined as being within the front-to-back direction LD range between the lower end of the side-sealing region 12A of the front panel F and the lower end of the side-sealing region 12A of the back panel B. Figure 1 and Figure 2 In the unfolded state shown, the two sides of the middle area L narrow into a コ shape or curve along the wearer's leg circumference, and the overall shape of the diaper is roughly hourglass-shaped.

[0069] Furthermore, this underwear-type disposable diaper has two main components: outer bodies 12F and 12B that form at least the waist area T, and an inner body 200 installed on the outer bodies 12F and 12B in a manner extending from the front panel F to the back panel B. In the side-sealing area 12A, the inner surfaces of the two sides of the outer body 12F in the front panel F and the two sides of the outer body 12B in the back panel B are respectively fused together with each other. The fusion can be performed in a suitable pattern. The width direction WD of the side-sealing area 12A can be appropriately determined. As an example, the width direction WD of the side-sealing area 12A can be set to 10~20 mm.

[0070] (inner body)

[0071] The internal component 200 can take any shape; in the example shown, it is rectangular. For example... Figures 3-5 As shown, the inner body 200 in the example figure includes a top sheet 30 located on the side of the body, a liquid-impermeable sheet 11, and an absorbent element 50 between them, thus becoming a component that performs the absorption function, but is not limited to this and can be modified appropriately. Reference numeral 40 shows an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 to allow liquid that has passed through the top sheet 30 to be quickly transferred to the absorbent element 50, and reference numeral 60 shows upright pleats 60 extending from both sides of the inner body 200 to contact the wearer's leg circumference in order to prevent excrement from leaking to both sides of the inner body 200.

[0072] (Top slide)

[0073] The top sheet 30 has the property of allowing liquid to pass through, and examples include non-woven fabrics with or without holes, perforated plastic sheets, etc. Furthermore, the top sheet 30 can be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets together. Similarly, the top sheet 30 can be composed of a single sheet or two or more sheets in the planar direction.

[0074] The two sides of the top plate 30 can either be folded back towards the back side from the side edge of the absorption element 50, or they can extend laterally from the side edge of the absorption element 50 without being folded back.

[0075] For the purpose of preventing positional displacement relative to the back side components, it is desirable that the top sheet 30 be fixed to the component adjacent to the back side by means of bonding based on material fusion, such as heat sealing or ultrasonic sealing, or by hot melt adhesive. In the example shown, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 located on the surface side of the absorber 56 by applying a hot melt adhesive to its back side.

[0076] (Intermediate film)

[0077] To enable the liquid that has passed through the top sheet 30 to be quickly transferred to the absorber 56, or to prevent the "backflow" of the absorbed liquid from the absorber 56, an intermediate sheet (also called a "second sheet") 40 can be provided, which has a liquid permeation speed faster than that of the top sheet 30. The intermediate sheet 40 can also be omitted.

[0078] As the intermediate sheet 40, examples can be the same raw materials as the top sheet 30, such as spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, a mixture of pulp and rayon, dot-bonded nonwoven fabric, or crepe paper. In particular, hot-air nonwoven fabric is preferred due to its greater fluffiness. In hot-air nonwoven fabric, composite fibers with a core-sheath structure are preferably used; in this case, the resin used for the core can be polypropylene (PP), preferably a more rigid polyester (PET). The area weight is preferably 17~80 g / m². 2 More preferably 17~50 g / m 2 The fineness of the raw fiber for nonwoven fabric is preferably 2.0~10 dtex. In order to make the nonwoven fabric fluffy, the mixed fibers used as all or part of the raw fiber are preferably eccentric fibers without a central core, hollow fibers, or eccentric and hollow fibers.

[0079] In the example diagram, the intermediate sheet 40 is positioned in the center with a width shorter than that of the absorbent element 56, but it can also be positioned across the entire width. The front-to-back length of the intermediate sheet 40 can be the same as the entire length of the diaper, the same as the length of the absorbent element 50, or a shorter length centered on the area receiving the liquid.

[0080] For the purpose of preventing positional displacement relative to the back side component, it is desirable that the intermediate sheet 40 be fixed to the component adjacent to the back side by means of bonding based on material fusion, such as heat sealing or ultrasonic sealing, or by hot melt adhesive. In the example shown, the intermediate sheet 40 is fixed to the surface of the portion of the package sheet 58 located on the surface side of the absorber 56 by applying a hot melt adhesive to its back side.

[0081] (Impermeable film)

[0082] The raw material for the liquid-impermeable sheet 11 is not particularly limited. Examples include plastic films made of polyolefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics with a plastic film on the surface of nonwoven fabric, and laminated sheets in which nonwoven fabrics are overlapped and bonded to plastic films. The liquid-impermeable sheet 11 preferably uses a raw material that is both liquid-impermeable and moisture-permeable, which is preferred from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, microporous plastic films are widely used. These microporous plastic films are obtained by mixing inorganic fillers into polyolefin resins such as polyethylene and polypropylene, forming a sheet, and then extending it in a uniaxial or biaxial direction. In addition, as the liquid-impermeable sheet 11, it is also possible to use nonwoven fabric with micro denier fibers, nonwoven fabric whose fiber gaps are reduced by applying heat and pressure and thereby strengthening its leak-proofness, or a liquid-impermeable sheet made by coating with a superabsorbent resin or hydrophobic resin and a waterproofing agent without using a plastic film. However, in order to obtain sufficient bonding strength when bonded to the cover nonwoven fabric 13 described later via a hot melt adhesive, it is desirable to use a resin film.

[0083] In addition to the width being designed to converge on the back side of the absorbent element 50 as shown in the figure, to improve leak-proofness, the impermeable sheet 11 can also bypass both sides of the absorbent element 50 and extend to both sides of the top sheet 30 of the absorbent element 50. For the width of this extension, approximately 5 to 20 mm on each side is appropriate.

[0084] (Stand up the pleats)

[0085] The stand-up pleats 60 extend along both sides of the inner body 200 in the front-to-back direction LD, and are designed to contact the wearer's leg circumference and prevent side leakage. The stand-up pleats 60 can also be omitted if necessary.

[0086] Figure 1 , Figure 3 and Figure 4 The raised pleats 60 shown (so-called three-dimensional pleats) rise from the side of the inner body 200 toward the surface. The root side portion 60B of the raised pleats 60 rises at an angle toward the center in the width direction, and the top side portion 60A rises at an angle toward the outside in the width direction compared to the middle portion. However, it is not limited to this and can be appropriately modified, such as adopting a shape in which it rises toward the center in the width direction as a whole.

[0087] To explain in more detail, the stand-up pleats 60 in the example figure are constructed as follows: a strip of pleated nonwoven fabric 62, having a length equal to the front-back length of the inner body 200, is folded back in the width direction WD at the top portion and folded into two parts. Multiple elongated pleat elastic members 63 are fixed at intervals along the long side in the width direction WD between the folded-back portion and the adjacent sheet. The base end of the stand-up pleat 60 located on the side opposite to the top portion (the end on the side opposite to the folded-back portion in the width direction WD) serves as a root portion 65 fixed in the inner body 200 to the side closer to the back side of the liquid-impermeable sheet 11. The portion other than the root portion 65 serves as the main body portion 66 (the portion on the folded-back side) extending from the root portion 65. Furthermore, the main body portion 66 has a root side portion 60B extending towards the center in the width direction and a top side portion 60A that folds back at the top of the root side portion 60B and extends outward in the width direction. This configuration is a face-contact type of standing pleat 60, but a line-contact type of standing pleat 60 that does not fold back outward in the width direction can also be used. Moreover, the two ends in the front-rear direction of the main body portion 66, in the folded state, serve as folded portions 67 fixed to the side surfaces of the top piece 30, while the middle portion in the front-rear direction between them serves as a non-fixed free portion 68, and the pleat elastic member 63 along the front-rear direction LD is fixed at least at the top of the free portion 68 in the extended state.

[0088] In the raised pleat 60 constructed as described above, the contractile force of the pleat elastic member 63 acts in a manner that brings the two ends in the front-to-back direction closer together. However, the two ends in the front-to-back direction of the main body 66 are fixed in a way that they are not raised. In contrast, the free part 68 between them is not fixed. Therefore, as... Figure 3 As indicated by the arrow, only the free portion 68 stands upright in contact with the side of the body. In particular, if the root portion 65 is located on the back side of the inner body 200, the free portion 68 stands upright in the crotch area and its vicinity, opening outward in the width direction. Therefore, the raised pleats 60 will come into contact with the leg circumference, improving the fit.

[0089] As illustrated in the example of the raised pleats 60, in the bent shape of the main body 66, which consists of a root side portion 60B extending towards the center in the width direction and a top side portion 60A that is folded back at the top of the root side portion 60B and extends outward in the width direction, the top side portion 60A and the root side portion 60B are joined in the bent state in the collapsed portion 67, and the root side portion 60B is joined to the top piece 30 in the bent state. The joining of the opposing surfaces in the collapsed portion 67 can be achieved using at least one of the following methods: hot melt adhesives based on various coating methods, and heat sealing, ultrasonic sealing, or other means based on the fusion of raw materials. In this case, the joining of the root side portion 60B and the top piece 30, and the joining of the top side portion 60A and the root side portion 60B, can be performed by the same means or by different means. For example, a preferred configuration is to use a hot melt adhesive to bond the root side portion 60B and the top piece 30, and to use raw material fusion to bond the top side portion 60A and the root side portion 60B.

[0090] As a pleated nonwoven fabric 62, it can be appropriately used in soft and uniform / concealed nonwoven fabrics such as spunbond nonwoven fabrics (SS, SSS, etc.), SMS nonwoven fabrics (SMS, SSMMS, etc.), and meltblown nonwoven fabrics. It is a nonwoven fabric that has been waterproofed with silicone or the like as needed. The fiber unit area weight is preferably 10~30 g / m². 2 Left and right. As the pleated elastic member 63, rubber thread or the like can be used. When using spandex rubber thread, the thickness is preferably 470~1240 dtex, more preferably 620~940 dtex. The elongation at the time of fixing is preferably 150~350%, more preferably 200~300%. Furthermore, as shown in the figure, the waterproof membrane 64 can also be positioned between the pleated nonwoven fabric 62 folded into two parts. In this case, the pleated nonwoven fabric 62 can be partially omitted from the portion where the waterproof membrane 64 is present. However, in order to make the product's appearance and skin feel like fabric, as shown in the example, at least the outer surface from the base end of the raised pleat 60 to the top end needs to be formed of the pleated nonwoven fabric 62.

[0091] The number of pleat elastic members 63 provided in the free portion of the raised pleat 60 is preferably 2 to 6, more preferably 3 to 5. An arrangement interval of 3 to 10 mm is suitable. If constructed in this way, the pleat elastic members 63 can easily contact the skin within the area where they are provided. Alternatively, the pleat elastic members 63 can be provided not only on the top side but also on the root side.

[0092] In the free portion 68 of the raised pleats 60, at least one of the following methods can be used for bonding the inner and outer layers of the pleated nonwoven fabric 62 and fixing the pleated elastic member 63 sandwiched therebetween: hot melt adhesives based on various coating methods, and fixing methods based on raw material fusion such as heat sealing and ultrasonic sealing. If the entire surface of the inner and outer layers of the pleated nonwoven fabric 62 is bonded, the softness will be compromised. Therefore, it is preferable that the portion of the pleated elastic member 63 other than the bonding portion is not bonded or is only weakly bonded. In the example shown, the structure is as follows: by using a coating component such as a coating gun and a glue nozzle, hot melt adhesive is applied only to the outer peripheral surface of the pleated elastic member 63 and sandwiched between the inner and outer layers of the pleated nonwoven fabric 62. The hot melt adhesive applied only to the outer peripheral surface of the pleated elastic member 63 is used to fix the pleated elastic member 63 to the inner and outer layers of the pleated nonwoven fabric 62, as well as to fix the inner and outer layers of the pleated nonwoven fabric 62 together.

[0093] Similarly, the fixing of the waterproof membrane 64 assembled on the raised pleats 60 and the pleated nonwoven fabric 62, as well as the fixing of the collapsed portion 67, can also be achieved using at least one of the following methods: hot melt adhesives based on various coating methods, and heat sealing, ultrasonic sealing, and other means based on the fusion of raw materials.

[0094] (Absorption element)

[0095] The absorbent element 50 has an absorbent body 56 and a packaging sheet 58 that completely encloses the absorbent body 56. The packaging sheet 58 can also be omitted.

[0096] (Absorber)

[0097] The absorbent 56 can be formed from an aggregate of fibers. This fiber aggregate can be obtained by piling short fibers such as cotton pulp or synthetic fibers, or it can be an aggregate of long filaments obtained by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate, as needed. The fiber weight per unit area can be, for example, set to 100-300 g / m² when piling cotton pulp or short fibers. 2 In the case of filament assemblies, the value can be set to, for example, 30~120 g / m². 2 The fineness is approximately 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex, in the case of synthetic fibers. In the case of filament assemblies, the filaments may also be non-crimped fibers, but crimped fibers are preferred. It is preferable to disperse and maintain highly absorbent polymer particles in the absorber 56.

[0098] The absorber 56 can also be rectangular, but as... Figure 7As shown, if it is formed into an hourglass shape with a narrower portion 56N in the middle of the front-to-back direction that is narrower than the front and back sides, the fit of the absorbent body 56 itself and the raised pleats 60 to the leg circumference is improved, therefore, this is preferred.

[0099] Furthermore, the size of the absorbent 56 can be appropriately determined as long as it covers the front, back, left, and right sides of the urination port, but it is preferable that it extends to or near the periphery of the inner body 200 in the front-back direction LD and the width direction WD. In addition, reference numeral 56X indicates the entire width of the absorbent 56.

[0100] (Highly absorbent polymer particles)

[0101] The absorbent 56 may contain, in part or in whole, highly absorbent polymer particles. These highly absorbent polymer particles include both "particles" and "powders." The highly absorbent polymer particles used in this disposable diaper can be used directly, for example, ideally with a particle size of less than 30% by weight remaining on the sieve after sieving (with 5 minutes of shaking) using a 500 μm standard sieve (JIS Z8801-1:2006), and ideally with a particle size of more than 60% by weight remaining on the sieve after sieving (with 5 minutes of shaking) using a 180 μm standard sieve (JIS Z8801-1:2006).

[0102] The material used for highly absorbent polymer particles can be used without particular limitations, but a water absorption capacity of 40 g / g or more is preferred. Highly absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles, and can include starch-acrylate (salt) graft copolymers, starch-acrylonitrile copolymer saponifications, sodium carboxymethyl cellulose crosslinks, and acrylate (salt) polymers. The shape of the highly absorbent polymer particles is preferably a commonly used powder or granular form, but other shapes can also be used.

[0103] The weight per unit area of ​​the highly absorbent polymer particles can be appropriately determined according to the absorption capacity required for the application of the absorber 56. Therefore, although it cannot be generalized, it can be set to 50~350 g / m². 2 .

[0104] (Packaging film)

[0105] When using packaging sheet 58, various materials can be used as raw materials, including tissue paper, particularly crepe paper, nonwoven fabric, polyethylene laminated nonwoven fabric, and sheets with small openings. However, sheets that do not shed highly absorbent polymer particles are desirable. When using nonwoven fabric instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly preferred, and the material can be polypropylene, polyethylene / polypropylene composites, etc. A weight per unit area of ​​5~40 g / m² is desirable. 2 The ideal value is 10~30 g / m 2 .

[0106] The packaging form of the packaging sheet 58 can be appropriately determined, but from the viewpoint of ease of manufacturing and preventing leakage of highly absorbent polymer particles from the front and rear ends, the following form is preferred: the absorbent body 56 is rolled into a cylindrical shape to surround the front and back sides and both sides, and its front and rear edges extend from the front and rear of the absorbent body 56. The overlapping parts of the rolled parts and the overlapping parts of the front and rear protruding parts are joined by bonding means such as hot melt adhesive or raw material fusion.

[0107] (Covered with non-woven fabric)

[0108] In the two-part outer garment type disposable diaper, since the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, it is preferable to have a nonwoven fabric cover 13 that covers the back of the inner body 200 from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200, so as to prevent the liquid-impermeable sheet 11 from being exposed on the back of the inner body 200.

[0109] The cover nonwoven fabric 13 is not particularly limited by the type of fiber or the method of fiber bonding (interlacing). For example, the same material as the first and second pieces of the outer casing 12F and 12B described later can be appropriately selected. As an example of the cover nonwoven fabric 13, hot-air nonwoven fabric can be appropriately used, in which case the weight per unit area is preferably 20 to 40 g / m². 2 The thickness is preferably 0.3 to 1.0 mm. As the cover nonwoven fabric 13, either a non-porous nonwoven fabric without holes that pass through the surface and back can be used, or a porous nonwoven fabric with multiple holes that pass through the surface and back can be used at intervals.

[0110] The front-to-back direction range of the nonwoven fabric 13 is not particularly limited, and it can be used as... Figure 2 and Figure 5 As shown, it extends integrally along the front-to-back direction LD throughout the interior body 200 from the front end to the rear end, or as shown... Figure 7As shown, it extends along the front-rear direction LD from the midpoint of the area where the front outer body 12F overlaps with the inner body 200 to the midpoint of the area where the rear outer body 12B overlaps with the inner body 200. Furthermore, in Figure 7 In the example shown, the front-to-back length 13y of the overlapping portion of the cover nonwoven fabric 13 and the front outer body 12F and the front-to-back length 13y of the overlapping portion of the cover nonwoven fabric 13 and the rear outer body 12B can be appropriately determined.

[0111] The width of the cover nonwoven fabric 13 is set to cover the exposed back portion of the liquid-impermeable sheet 11. Therefore, in the example shown, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right upright pleats 60, the cover nonwoven fabric 13 is provided in such a way that it covers at least the width from the back side of the base end of one upright pleat 60 to the back side of the base end of the other upright pleat 60. Thus, the liquid-impermeable sheet 11 can be hidden using the cover nonwoven fabric 13 and the pleated nonwoven fabric 62 of the upright pleats 60. Furthermore, even if the width ends of the cover nonwoven fabric 13 are upright and do not cover the back sides of the base ends of the pleats 60, and the pleated nonwoven fabric 62 covers the back sides of both width ends of the cover nonwoven fabric 13, the liquid-impermeable sheet 11 can still be hidden using the cover nonwoven fabric 13 and the pleated nonwoven fabric 62. In this case, since the two sides of the cover nonwoven fabric 13 are covered by the pleated nonwoven fabric 62, the two sides of the cover nonwoven fabric 13 have the advantage that they are difficult to peel off from the liquid-impermeable sheet 11.

[0112] The inner and outer surfaces of the cover nonwoven fabric 13 can be bonded to opposite surfaces using a hot melt adhesive. In addition to being fixed entirely in the front-to-back direction and the entire width direction, the fixed area of ​​the cover nonwoven fabric 13 can also be partially non-fixed. For example, if the two ends of the cover nonwoven fabric 13 in the width direction are non-fixed, even if the sides of the absorbent 56 slightly shrink due to the effect of the raised pleats 60, it is difficult to be affected, resulting in the advantage that wrinkles and bends are less likely to form on the cover nonwoven fabric 13.

[0113] (Inner body fixing part)

[0114] The inner component 200 can be fixed to the outer components 12F and 12B by means of bonding based on material fusion, such as heat sealing or ultrasonic sealing, or by hot melt adhesive. In the example shown, it is fixed to the inner surface of the outer components 12F and 12B by a hot melt adhesive applied to the back of the inner component 200, i.e., the back of the liquid-impermeable sheet 11 in this case, and the root portion 65 of the raised pleats 60. Figure 2As shown, the inner body fixing parts 201 and 202 that fix the inner body 200 to the outer bodies 12F and 12B can be provided in the general whole of the area where the two overlap, for example, they can also be provided in the part of the inner body 200 except for the two ends in the width direction.

[0115] (outer body)

[0116] The illustrated outer garments 12F and 12B consist of a rectangular front outer garment 12F forming the waist region T of the front body piece F and a rectangular rear outer garment 12B forming the waist region T of the rear body piece B. The front outer garment 12F and the rear outer garment 12B are not continuous at the crotch side, but are separated in the front-to-back direction LD. This separation distance 12d can be set, for example, to about 0.2 to 0.5 times the total length Y. The outer garments 12F and 12B can also be a continuous, one-piece outer garment from the front body piece F to the rear body piece B through the crotch area.

[0117] The portions of the outer casings 12F and 12B located in the waist region T can be divided into the waist portion W, which forms the end on the side of the waist opening WO, and the portion lower than the waist portion W, namely the lower waist portion U. When the portions of the outer casings 12F and 12B located in the waist region T have a boundary for the change in elastic force in the width direction WD (e.g., changes in the thickness or elongation of the elastic member), the portion closer to the waist opening WO than the boundary closest to the waist opening WO (where there is a gap between the lowermost elastic member of the waist portion W and the uppermost elastic member of the lower waist portion U, and the center of this gap is the boundary) is the waist portion W. In the absence of such a boundary, the waist extension portion 12E extending to the side of the waist opening WO compared to the absorber 56 or the inner casing 200 is the waist portion W. Their lengths in the front-to-back direction LD vary depending on the size of the product and can be appropriately determined; however, as an example, the waist portion W can be set to 15-40 mm, and the lower waist portion U can be set to 65-120 mm.

[0118] Furthermore, in the example shown, the front outer casing 12F and the rear outer casing 12B have equal dimensions in the front-rear direction LD, and neither has a portion located in the middle region L. However, as shown... Figure 7 As shown by the double-dotted line, the rear outer body 12B has a longer front-to-back dimension compared to the front outer body 12F. Although the front outer body 12F does not have a portion located in the middle region L, the rear outer body 12B can also have a buttock cover C extending from the waist region T towards the middle region L. Although not shown, a groin cover extending from the waist region T towards the middle region L can also be provided on the front outer body 12F, or a shape can be adopted in which a groin cover is provided but a buttock cover is not provided.

[0119] To improve the fit relative to the wearer's waist, elastic members 15 and 17 are built into the outer garment bodies 12F and 12B, and a stretchable region A2 is formed therein that elastically stretches and contracts along the width direction WD together with the elastic members 15 and 17. In this stretchable region A2, the outer garment bodies 12F and 12B elastically stretch and contract between their natural length state and their extended state. In their natural length state, they contract along the width direction WD due to the contraction of the elastic members 15 and 17, forming a fold P. In their extended state, they stretch to their maximum elongation together with the elastic members 15 and 17, causing the fold P to disappear. The elastic members 15 and 17 can be any known elongated elastic members, such as those in the form of threads or strips, without particular limitation. Both synthetic rubber and natural rubber can be used as the elastic members 15 and 17.

[0120] To explain the elastic members 15 and 17 in the example diagram in more detail, multiple waist elastic members 17, composed of elongated elastic members, are installed at intervals along the front-to-back direction in a continuous manner throughout the width direction WD of the outer bodies 12F and 12B. Furthermore, regarding one or more waist elastic members 17 disposed in the region adjacent to the lower part U of the waist, they can either overlap with the inner body 200, or be respectively disposed on both sides of their width direction except for the central portion overlapping with the inner body 200. Preferably, the waist elastic member 17 has a diameter of 155-1880 dtex, particularly around 470-1240 dtex (in the case of synthetic rubber; in the case of natural rubber), and a cross-sectional area of ​​0.05-1.5 mm. 2 Especially 0.1~1.0 mm 2 The rubber lines (left and right) are arranged at intervals of 2 to 15, particularly 4 to 10, of which 2 to 12 mm intervals, especially 3 to 7 mm intervals. The maximum elongation rate of the waist W in the width direction WD of the waist elastic member 17 can be appropriately determined, for example, it can be set to 150 to 400%, especially approximately 220 to 320%. The spacing of the front-to-back direction LD of the waist elastic member 17 can be constant or vary in the middle of the front-to-back direction LD.

[0121] Furthermore, preferably, multiple elongated elastic members 15, each consisting of a slender elastic member, are installed at intervals along the front-to-back direction in the lower waist portion U of the outer casings 12F and 12B. Preferably, the lower waist elastic members 15 have a diameter of 155-1880 dtex, particularly around 470-1240 dtex (in the case of synthetic rubber; in the case of natural rubber), and a cross-sectional area of ​​0.05-1.5 mm. 2 Especially 0.1~1.0 mm 2The rubber lines (left and right) are arranged at intervals of 1 to 15 mm, particularly 3 to 8 mm, about 5 to 30. The maximum elongation in the width direction WD of the lower waist portion U of the elastic member 15 below the waist can be appropriately determined, for example, it can be set to 180 to 300%, more preferably 190 to 240%, and particularly preferably about 200 to 240%. The interval of the elastic member 15 below the waist in the front-rear direction LD can be constant, or it can vary in the middle of the front-rear direction LD as shown in the example.

[0122] As shown in the example of the lower waist portion U, when the lower waist elastic member 15 is provided within the range of the front-rear direction LD of the absorber 56, in order to prevent partial or complete contraction of the absorber 56 in the width direction WD, it is preferable to designate the middle of the width direction (preferably including the entirety of the inner body fixing portions 201, 202), including part or all of the portion overlapping with the absorber 56 in the width direction WD, as a non-stretchable region A1, and designate the two sides of it as stretchable regions A2. The maximum elongation of the non-stretchable region A1 can be appropriately determined, for example, it can be set to about 100~120%. The lower waist portion U can also be entirely designated as a stretchable region A2 throughout the width direction WD. Preferably, the waist portion W is entirely designated as a stretchable region A2 throughout the width direction WD, but similarly to the lower waist portion U, a non-stretchable region A1 can also be provided in the middle of the width direction.

[0123] Such a stretchable region A2 and a non-stretchable region A1 can be constructed as follows: During the manufacturing of the outer casings 12F and 12B, after the elastic member 15 is fixed, in the region becoming the non-stretchable region A1, the elastic member 15 below the waist is cut at one point in the width direction or cut in multiple small places by applying pressure and heat. This leaves stretchability in the stretchable region A2 and eliminates stretchability in the non-stretchable region A1. In these cases, in the non-stretchable region A1, cut pieces 16 of the elastic member, which do not substantially contribute to stretching, remain within the outer casings 12F and 12B. In the stretchable region A2, the elastic members 15 and 17 are continuously continuous throughout their width direction (stretching direction).

[0124] (External telescopic structure)

[0125] like Figure 5As shown, the waist W has: an outer portion 18, which has a first piece 12S made of nonwoven fabric and a second piece 12H made of nonwoven fabric laminated thereon; and an inner portion 19, which is formed by folding the first piece 12S and the second piece 12H continuously from the outer portion 18 inward from the edge We of the waist opening WO, wherein the first piece 12S extends throughout the entire waist W. The inner portion 19 is joined to the outer portion 18 by a hot melt adhesive HM (or a fusion bonding agent). In the example shown, the first piece 12S and the second piece 12H of the outer portion 18 extend from the waist W throughout the lower waist portion U (in the case of the example shown, throughout the entire waist area T), but it is not limited to this. Other pieces can be used to form the lower waist portion U, and appropriate modifications can be made. Additionally, in the example shown, the second piece 12H of the inner portion 19 extends only to the middle of the front-rear direction LD in the waist W, and the first piece 12S extends from the waist W to the lower waist portion U, covering the end of the inner body 200 at the waist opening WO side. However, this is not a limitation. For example, both the first piece 12S and the second piece 12H may extend to the lower waist portion U, or they may converge within the waist W, or extend only to a position closer to the waist opening WO side than the inner body 200, or they may not cover the end of the inner body 200. Furthermore, the second piece 12H may exist only in the outer portion 18 and not extend to the inner portion 19. Moreover, unlike the example shown, the inner portion 19 may not be provided.

[0126] The raw materials for the first 12S sheet and the second 12H sheet can be appropriately determined, and breathable sheets such as nonwoven fabrics can be appropriately used. For example, as the first 12S sheet and the second 12H sheet, nonwoven fabrics composed of materials such as polyethylene, polypropylene, and other polyolefin-based, polyester-based, polyamide-based, or mixed fibers or composite fibers using two or more of these materials can be used. Examples of fiber bonding methods include hot air bonding and spot bonding. The fineness, weight per unit area, and thickness of the nonwoven fabric used for the first 12S sheet and the second 12H sheet can be appropriately determined. As an example, the first 12S sheet and the second 12H sheet have a fineness of 1.0~3.0 dtex and a weight per unit area of ​​10~20 g / m². 2 In addition to long-fiber nonwoven fabrics with a thickness of 0.15~0.50 mm, nonwoven fabrics with a fineness of 1.0~2.5 dtex and a unit area weight of 15~25 g / m² can also be used. 2 Short fiber nonwoven fabric with a thickness of 0.7~1.5mm.

[0127] exist Figure 5In the example shown, a telescopic region A2 is formed by providing a waist elastic member 17 between the outer portion 18 and the inner portion 19 in the waist W, but this is not a limitation. Although not shown, the waist elastic member 17 may also be provided between the first piece 12S and the second piece 12H in the inner portion 19, or between the first piece 12S and the second piece 12H in the outer portion 18. Figure 5 In the example shown, the waist elastic member 17 is fixed to the second piece 12H of the outer portion 18 and the inner portion 19 by a hot melt adhesive HM applied to its outer peripheral surface, but it can also be fixed using the fixing part 84 described later. The waist W forms pleats by contracting along the width direction WD together with the waist elastic member 17 in its natural length state, but in the wearing state where it is stretched to a certain extent along the width direction WD together with the waist elastic member 17, the pleats unfold, and in the unfolded state, the pleats completely disappear.

[0128] In the lower waist portion U, a telescopic region A2 is formed by providing a lower waist elastic member 15 between the first piece 12S and the second piece 12H in the outer portion 18, but this is not a limitation. Although not shown, some or all of the lower waist elastic members 15 can also be provided between other pieces. In the example shown, the lower waist elastic member 15 is fixed to the first piece 12S and the second piece 12H by fusion bonding in the wavy joint area 80 described later, but this is not a limitation. Some or all of the lower waist elastic members 15 can also be fixed to the first piece 12S and the second piece 12H by applying a hot melt adhesive HM to the outer peripheral surface of the lower waist elastic member 15. In order to fix the lower waist elastic member 15 and other elastic members used to form the telescopic region A2 between the first piece 12S and the second piece 12H, the first piece 12S and the second piece 12H should at least cover the entire telescopic region A2, and preferably be continuous throughout the entire built-in area of ​​the elastic member.

[0129] In the outer casings 12F and 12B of the illustrated examples, wavy linear joint areas 80, which are continuous in the front-rear direction LD and traverse the elastic members 15 and 17, are arranged at intervals along the width direction WD. The entire area between adjacent wavy linear joint areas 80 in the width direction WD is considered a non-jointing area 90 (i.e., the wavy linear joint areas 80 and the non-jointing area 90 alternate repeatedly in the width direction). In the illustrated examples, the wavy linear joint areas 80 and the non-jointing area 90 are continuous over the approximately entire overlapping portion of the first piece 12S and the second piece 12H (i.e., over the outer portion 18 and the inner portion 19), but for example, they may only be provided in the outer portion 18 or only in the lower waist portion U of the outer portion 18, or only in a portion thereof. Furthermore, in the outer casings 12F and 12B of the illustrated examples, the wavy linear joint areas 80 and the non-jointing area 90 are provided throughout the entire area including the telescopic region A2 and the non-telescopic region A1, but for example, the wavy linear joint area 80 may not be provided in the non-telescopic region A1. Moreover, as shown in the example, if one of the first piece 12S and the second piece 12H of the inner portion 19 extends towards the center of the front-rear direction LD compared to the other piece, either the extended portion may retain the same trace as the joint portion 81 described later for forming the wavy line joint area 80, or there may be no trace at all.

[0130] In each wavy joint area 80, joint portions 81, where the first piece 12S and the second piece 12H are fused together, are provided intermittently or continuously in portions that do not intersect with the elastic member 15, and the portions that intersect with the elastic member 15 become fixing portions 84 that fix the elastic member 15 to the first piece 12S and the second piece 12H. As a processing method for forming the fusion joint 81, ultrasonic fusion is preferred, but heat fusion based on roller heating can also be used. Here, the state in which the first 12S and the second 12H are fused together includes not only the state in which almost all the fibers of the first 12S and the second 12H are melted and integrated (for example, less than 10 fibers may fly out) and become a film (with higher transparency than the surrounding area), but also all states in which the first 12S and the second 12H are joined, namely: the state in which the fibers of the layer on the joining surface side of the first 12S and the second 12H are almost entirely melted and the fibers of the layer on the opposite side are not melted and remain in an independent state; the state in which almost all the fibers of either the first 12S or the second 12H are melted and become a film and the fibers of the other are almost entirely melted or the fibers of the layer on the opposite side of the joining surface remain, etc.

[0131] Thus, the telescopic region A2, which has intermittent wavy joint areas 80 in the width direction WD (telescopic direction), becomes a region that elastically expands and contracts between its natural length state and its extended state. In its natural length state, such as Figure 11 (a) or Figure 12 As shown in (a), the elastic member 15 contracts along the width direction WD, and the portions of the first piece 12S and the second piece 12H located in the non-jointing region 90 expand away from each other in opposite directions, forming continuous folds P along the front-rear direction LD (orthogonal direction). In this unfolded state, as... Figure 11 (c) or Figure 12 As shown in (c), the wrinkle P disappears as the elastic member 15 elongates along the width direction WD to its maximum elongation. Furthermore, Figure 11 (b) and Figure 12 (b) shows the elongation state with an expected elongation of 150% in the width direction WD when worn.

[0132] The dimensions of each part can be appropriately determined. For example, if the interval 90W in the width direction WD of the joint 81 of adjacent wavy linear joint areas 80 (equal to the dimension 90W in the width direction WD of the non-joint area 90) is 7-14 mm, particularly 8-11 mm, and the dimension 80W in the width direction WD of the joint 81 is 0.04-0.3 times, particularly 0.07-0.15 times (or 0.49-2.8 mm, particularly 0.8-1.65 mm) of the interval between adjacent joints 81 in the width direction WD, then the width of the portion that will become the fold P can be ensured to be relatively large, and therefore this is preferred. In this case, if the total amplitude α of the side edge of the wavy linear joint area 80 is 0.2-0.7 times, particularly 0.3-0.6 times, of the interval between adjacent joints 81 in the width direction WD, and the maximum elongation of the stretching area A2 in the width direction WD is 200-240%, particularly 200-220%, it is particularly preferred. That is, in the expansion structure where the portions of the first piece 12S and the second piece 12H located in the non-jointed region 90 expand away from each other in opposite directions to form a continuous fold P along the front-rear direction LD, the height of the fold P affects the cushioning performance. Here, (a) The joint area is wavy; (b) The spacing 90W between adjacent joints 81 in the width direction WD is 7~14 mm; (c) The dimension 80W of the joint 81 in the width direction WD is 0.04 to 0.3 times the spacing between adjacent joints 81 in the width direction WD; (d) The total amplitude α of the side edge of the wavy linear joint region 80 is 0.2 to 0.7 times the spacing between adjacent joints 81 in the width direction WD; and (e) The maximum elongation of the expansion region A2 in the width direction WD is 200~240%. In such a combination of conditions, In its natural length state, adjacent joints 81 in the width direction WD do not approach each other, thus ensuring a certain degree of spacing, such as Figure 11 As shown in (a), either side of the width direction WD in this interval (omitted since the side opposite to the illustration is symmetrical), or as shown in (a) Figure 12 As shown in (a), on both sides, along with the base P1 which does not stand up to the extent of forming a fold P, a thinner fold P will be formed on one side of the base P1 or between the bases P1.

[0133] This principle can be explained as follows: Considering the side edges of the adjacent first wavy linear junction region 80(L) and the second wavy linear junction region 80(R) in their currently unfolded state, the side edge of the first wavy linear junction region 80(L) has a proximal peak LN protruding towards the second wavy linear junction region 80(R) and a distal peak LF protruding in the opposite direction. Similarly, the side edge of the second wavy linear junction region 80(R) has a proximal peak RN protruding towards the first wavy linear junction region 80(L) and a distal peak RF protruding in the opposite direction. Furthermore, as the elastic members 15 and 17 contract, when the side edges of the adjacent first wavy linear joint region 80(L) and the second wavy linear joint region 80(R) approach each other in the width direction WD and form a fold P in the first piece 12S and the second piece 12H, depending on the position in the front-rear direction LD, one upright position of the fold P tends to produce a line connecting the proximal peaks LN of the first wavy linear joint region 80(L), or another upright position of the fold P tends to produce a line connecting the proximal peaks RN of the second wavy linear joint region 80(R), or both. As a result, as... Figure 11 (a) and Figure 12 As shown in (a), on either side of the width direction WD of the interval between adjacent joints 81 in the width direction WD, a thinly folded fold P is formed on one side of the base P1 or between the bases P1, which does not stand up to the extent of forming a fold P. Furthermore, the shape of the fold P when viewed from the thickness direction is wavy along the center of the width direction WD of the non-joint region 90.

[0134] As the base P1 folds P elongate along the width direction WD to become a worn state, such as Figure 11 (b) and Figure 12As shown in (b), since the raised position of the pleat P is lifted and the bend at the boundary between the pleat P and the base P1 is opened, the reduction in the height of the pleat P will be less until the bend is opened. Moreover, the shape of the pleat P viewed from the thickness direction is a wavy line along the center of the width direction WD of the non-jointed area 90, and the part orthogonal to the width direction WD is only the peak position. Therefore, the crushing effect of the pleat P in the thickness direction is difficult to be transmitted in the continuous direction of the pleat P. This means that the pleat P is difficult to crush. Therefore, in the stretchable structure that satisfies the above conditions (a) to (e), by suppressing the reduction in the height of the pleat P in the wearing state (in other words, the change in the height of the pleat P from the natural length state to the wearing state is small) and making the pleat P difficult to crush, the cushioning in the wearing state can be improved.

[0135] In order to form the fold P accompanying the base P1, in the natural length state, it is preferable that the interval between adjacent wavy line joint areas 80 in the width direction WD (equal to the interval between adjacent joints 81 in the width direction WD) is about 2 to 7 mm, and in particular about 3 to 6 mm.

[0136] In the wavy joint region 80, as shown in the example, if the wavelength λ of the side edge and the total amplitude α of the side edge are constant, the base P1 of the aforementioned fold P will also be formed regularly, and the cushioning performance in the wearing state will be better. Therefore, this is preferred, but it can also be varied. Additionally, as... Figure 10 As shown in (b), the wavy line joint area 80 can be triangular wavy, etc., but except for... Figure 10 Besides the continuous wavy or sinusoidal curves shown in (a) where the change in the tangent slope is continuous (excluding straight and bent sections) and gentle curves, it can also be like... Figure 10 As shown in (c), it is a wave-like shape composed of a combination of straight section 85 and curved section 86. The wave-like joining region 80 is even as... Figure 10 As shown, the centerline 82, which makes the displacement of the side edge zero, runs along the front-rear direction. Alternatively, it can be done as shown... Figure 8 As shown, it is inclined in a manner with a small acute-angled side crossing angle θ, for example, less than 10 degrees. Furthermore, if the aforementioned improvement in cushioning is not required, the wavy joint area 80 may be omitted, and instead... Figure 18 The joint area 89 can be a straight line as shown, or a curved (arc, etc.) joint area other than a wavy line not shown.

[0137] Especially as Figure 8As shown in the example, if the wavelength λ of the side edge of the wavy linear joint region 80 is constant, the total amplitude α of the side edge is twice the half amplitude and constant, and the acute angle θ between the centerline 82 with zero displacement of the side edge and the front-rear direction LD is 3 to 7 degrees, and the dimension of the expansion and contraction direction of the non-joint region 90 is constant in the front-rear direction LD, then the crushing difficulty of the wrinkle P is increased, and the cushioning performance in the wearing state is also better. Therefore, this is preferred. In addition, when the joint 81 is formed by ultrasonic welding, the stability of the welding quality is also excellent.

[0138] As shown in the example, when a stretchable structure with an acute lateral intersection angle of 3 to 7 degrees between the centerline 82 (where the displacement of the side edge in the wavy joint area 80 is zero) and the front-to-back direction LD is applied between the side sealing areas 12A of the outer body 12F and 12B of a disposable underwear-type garment, when viewed from the front surface in the natural length state of the product where the inner surface of the front panel F and the inner surface of the back panel B are in contact, as shown in the example, Figure 13 As shown, if the center line 82 of the wavy joint area 80 in the telescopic structure of the outer body 12F of the front body piece F and the center line 82 of the wavy joint area 80 in the telescopic structure of the outer body 12B of the rear body piece B are inclined in the same direction relative to the front-rear direction LD, then in the product state where the inner surface of the front body piece F and the inner surface of the rear body piece B are in contact with each other at their natural length, the side sealing area 12A in the outer body 12B of the front body piece F and the rear body piece B will be deformed into a parallelogram shape that is inclined in the same direction to either the left or right. As a result, the shape of the waist area T viewed from the front surface also becomes the same, and the fit and left-right balance in appearance will be destroyed.

[0139] In contrast, such as Figure 14 As shown, if the center line 82 of the wavy joint area 80 in the telescopic structure of the outer body 12F of the front body piece F and the center line 82 of the wavy joint area 80 in the telescopic structure of the outer body 12B of the rear body piece B are inclined in opposite directions relative to the front-rear direction LD, then in the product state where the inner surface of the front body piece F and the inner surface of the rear body piece B are in contact, the deformation between the side sealing areas 12A in the outer body 12F of the front body piece F and the deformation between the side sealing areas 12A in the outer body 12F of the front body piece F are in opposite directions. Although the inclination of the side sealing areas 12A is in opposite directions to the left and right, the shape of the waist area T viewed from the front surface is approximately rectangular. Therefore, the left-right balance of fit is good, and in addition to the inclination of the side sealing areas, the left-right balance of appearance is also good.

[0140] Preferably, the spacing 90W between adjacent joints 81 in the width direction WD, the dimension 80W of the width direction WD of the joint 81, the total amplitude α of the side edge of the wavy joint area 80, the wave shape of the wavy joint area 80, the acute angle θ formed by the center line 82 of the wavy joint area 80 with zero displacement of the side edge and the front-rear direction LD, and the dimension 90W of the width direction WD of the non-joint area 90 are constant in the front-rear direction LD, but any one, several or all of them can be varied.

[0141] In each wavy joint region 80, the joint portions 81 are intermittently arranged along the front-rear direction LD in the portion that does not intersect with the elastic member 15. As long as the two side edges of adjacent joint portions 81 along the front-rear direction LD (orthogonal direction) are connected to form wavy regions, the interval of the front-rear direction LD can be appropriately determined. As an example, preferably, such as... Figure 8 and Figure 9 As shown, the spacing 81D of adjacent joints 81 along the front-rear direction LD (orthogonal direction) extends throughout each wavy joint region 80. These joints are spaced at intervals shorter than the diameter of the elastic member 15 at its natural length along the front-rear direction LD. Joints 81 are closely connected to both sides of each elastic member 15 in the front-rear direction LD. In this case, as the elastic member 15 contracts and its diameter expands, the portion of the elastic member 15 located at the fixing portion 84 is fastened and constrained by the cylindrical portion formed by the joints 81 closely connected to the front and rear sides of the elastic member 15 and the portion between them. Therefore, as... Figure 9 As shown in (b), it is also possible that the first piece 12S and the second piece 12H are not integrally fused to the elastic member 15 using the fixing part 84, but rather the elastic member 15 is fixed only by the frictional force generated by the inner surface of the cylindrical portion formed by the joint 81 that is in close contact with the front and rear sides of the elastic member 15 and the portion therebetween. However, as shown in (b), Figure 9As shown in (a), preferably, a portion 84m (or the entirety) of at least one of the first piece 12S and the second piece 12H is fused to the elastic member 15 using the fixing part 84. This suppresses hardening caused by the fusion and homogenizes the feel throughout each wavy joint area 80, forming smooth, wavy wrinkles P. Furthermore, by fusing a portion 84m (or the entirety) of at least one of the first piece 12S and the second piece 12H to the elastic member 15 in the fixing part 84, the elastic member 15 is more securely fixed, unlike the case where the elastic member 15 is fixed solely by friction. Of course, as long as the elastic member 15 is fixed using the fixing part 84, the joint part 81 can also be provided at intervals greater than the diameter of the elastic member 15's natural length in the portions that do not intersect with the elastic member 15. Furthermore, in the case of the example shown in the figure, the spacing 81D between adjacent joints 81 in the front-back direction LD (orthogonal direction) may be larger than, equal to, or slightly shorter than the diameter of the elastic member 15 in the unfolded state.

[0142] On the other hand, if the joint 81 in the wavy joint area 80 is continuously provided in the front-back direction LD in the part that does not intersect with the elastic member 15, the entire joint 81 can be formed with a constant joint strength. However, in general, the weaker the bonding strength of the nonwoven fabric based on welding, the more it will inhibit the melting of the fibers and become softer. Therefore, for example, a strong joint with relatively high bonding strength can be provided in the part near the front and back sides of the elastic member 15, and a weak joint with relatively low bonding strength can be provided in the other parts (illustration omitted).

[0143] (Side sealing area)

[0144] In the side sealing area 12A, such as Figures 15-18 As shown in the example, the welding of the two sides of the outer body 12F in the front body panel F and the two sides of the outer body 12B in the rear body panel B is preferably performed using dispersed welding points 70. Such welding points 70 can be formed by ultrasonic welding or heat sealing according to a predetermined pattern of welding points 70, with the two sides of the outer body 12F in the front body panel F overlapping the two sides of the outer body 12B in the rear body panel B. Figure 20 It shows Figure 5 In the example shown, the cross-section of the side sealing area is such that, at the welding point 70, these sheets are welded together by applying pressure (from the left and right sides in the figure) in the thickness direction.

[0145] like Figure 15 and Figure 19As shown in the example, the side sealing region 12A has a unit dot matrix 71, which is formed by fusion points 70 at the vertices of an isosceles triangle it having a base along the width direction WD and a vertex on the side of the waist opening WO, arranged at intervals. Preferably, there are no fusion points 70 on the sides of the unit dot matrix 71, and the fusion point 70 of the unit dot matrix 71 located on the inner side of the width direction WD is the fusion point 70 of the side sealing region 12A located on the inner side of the width direction WD. Furthermore, the arrangement of fusion points 70 at the vertices of the isosceles triangle it in the unit dot matrix 71 includes cases where the center of the fusion point 70 (or the centroid if it does not have a center) is located at each vertex, and cases where the portion of the fusion point 70 other than the center is located at each vertex.

[0146] The dimension 71y of the front-to-back direction LD of the unit matrix 71 is preferably more than 1 to 3 times but less than 3 times the dimension 70y of the front-to-back direction LD of the weld point 70, more preferably 2 to 3 times. Furthermore, the dimension 71x of the width direction WD of the unit matrix 71 is preferably 3 to 15 times the dimension 70x of the width direction WD of the weld point 70, more preferably 4 to 7 times. The interval 71d of the front-to-back direction LD of the unit matrix 71 can be appropriately determined; for example, it can be set to 0.2 to 3 times the dimension 70y of the front-to-back direction LD of the weld point 70. Particularly when there are weld points 70(S) other than the unit matrix 71 described later, it can be set to 1 to 2 times; when there are no weld points 70(S) other than the unit matrix 71 described later, it can be set to 0.2 to 1 times. The dimensions 70y of the front-to-back direction LD and 70x of the width direction WD of the weld point 70 can be appropriately determined; for example, they can be set to 0.8 to 1.5 mm respectively, particularly 0.8 to 1.2 mm.

[0147] Additionally, preferably, the interval region 72 between adjacent unit lattice 71 along the front-back direction LD and the side region 73 of unit lattice 71 do not have fusion points 70.

[0148] In the pattern of the weld points 70 in the side sealing region 12A, when the side of the outer body 12F of the front body panel F and the side of the outer body 12B of the rear body panel B are torn from the waist opening WO side in the side sealing region 12A, the tearing mechanism of each unit dot matrix 71 is repeatedly performed. When tearing each unit dot matrix 71, the starting point is determined to be a weld point 70 located on the waist opening WO side. After the starting point, the weld points 70 to be torn are arranged along the width direction WD. Therefore, the direction of the tearing force is stable, and the weld points 70 of both sides can be torn smoothly, making it difficult to produce transverse cracks towards the central side of the width direction WD. In addition, in the tearing (peeling) of each weld point 70, in addition to the overall substrate damage (fracture) of the periphery of the weld point 70 of either the outer body 12F of the front body panel F or the outer body 12B of the rear body panel B, it also includes the peeling of the interface between the outer body 12F of the front body panel F and the outer body 12B of the rear body panel B in the weld point 70. The aforementioned unit dot matrix 71 is preferably arranged repeatedly along the front-back direction LD of the side sealing area 12A at intervals, but it can also be only a part of the area.

[0149] like Figure 16 and Figure 17 As shown, the side sealing region 12A may also not have weld points 70 other than the unit lattice 71. In this case, the weld point 70 of the unit lattice 71 located on the outermost side of the width direction WD is the weld point 70 of the side sealing region 12A located on the outermost side of the width direction WD. On the other hand, it is preferable that the side sealing region 12A has one or more weld points 70(S) on the side of the interval region 72 of the unit lattices 71 adjacent in the front-rear direction LD. In this case, the weld point 70(S) other than the unit lattice 71 is the weld point 70 located on the outermost side of the width direction WD of the side sealing region 12A. Thus, when tearing moves from one unit lattice 71 to the next unit lattice 71, it is necessary to tear the weld point 70(S) located on the side (outer side of the width direction WD), and therefore, it is more difficult to generate transverse cracks toward the central side of the width direction WD. Figure 19As shown, the weld points 70(S) other than the unit lattice 71 are preferably arranged on the extension line 74 of the hypotenuse of the isosceles triangle it formed by the unit lattice 71. This includes cases where the center (or the centroid if it does not have a central shape) of the weld points 70 other than the unit lattice 71 is located on the extension line 74 of the hypotenuse of the isosceles triangle it, and cases where the portion of the weld point 70 other than the center is located on the extension line 74 of the hypotenuse of the isosceles triangle it. Furthermore, the interval d1 (the interval between the center or the centroid if it does not have a central shape) between the weld points 70(S) other than the unit lattice 71 and the weld points 70 located laterally in the unit lattice 71 is preferably 0.9 to 1.1 times, more preferably 1 times (equal), the interval between the weld points 70 located on the waist opening WO side and the weld points 70 located laterally in the unit lattice 71. Figure 17 In the example shown, there is no weld point 70 other than the unit lattice 71, but it is also possible to have a weld point 70 other than the unit lattice 71.

[0150] like Figure 17 As shown, the unit lattice 71 can also be arranged along the front-back direction LD without any positional offset in the width direction WD, but as... Figure 15 , Figure 16 , Figure 18 and Figure 19 As shown, it is also preferable to have a unit dot matrix group 75, which is composed of a plurality of unit dot matrices 71 arranged along the front-back direction LD. The unit dot matrix 71 closer to the leg opening LO side is offset laterally by a distance d3 less than the width direction WD dimension of the welded portion. This unit dot matrix group 75 is repeatedly arranged along the front-back direction LD in a rectangular area circumscribed with all the unit dot matrices 71. In this case, when the tear moves from one unit dot matrix 71 to the next unit dot matrix 71, since the tearing force tends to be directed to the side (outside the width direction WD), it is more difficult to produce a transverse tear toward the central side of the width direction WD. The offset distance d3 of adjacent unit dot matrices 71 in the unit dot matrix group 75 (the interval between the center of the corresponding welded point 70 or the center of gravity in the width direction WD if the shape does not have a center) can be appropriately determined, but it is preferably less than the width direction WD dimension 70x of the welded point 70, and particularly preferably 0.5 to 0.9 times the width direction WD dimension 70x of the welded point 70.

[0151] As in the example above, if the spacing 90W of the width direction WD of the linear joint regions 80 and 89 is wider than the width direction WD of the side sealing region 12A, it is possible that the linear joint regions 80 and 89 are not arranged within the side sealing region 12A and the excess portion 12R on its sides. In this case, the outermost fixing portion 84 of the elastic members 15 and 17 becomes the central side of the width direction WD compared to the side sealing region 12A, and the width direction WD of the telescopic region A2 may become locally shorter (reduced telescopicity). On the other hand, if the spacing of the width direction WD of the linear joint regions 80 and 89 converges within the width direction WD of the side sealing region 12A, although this problem will not occur, the spacing of the width direction WD of the linear joint regions 80 and 89 will be limited. In addition, in order to fix the elastic members 15 and 17 using the welding points 70 within the side sealing region 12A, the welding points 70 can be arranged densely, but the flexibility of the side sealing region 12A may be reduced. Therefore, as Figures 15-18 As shown, when the spacing of the linear joint regions 80 and 89 in the width direction WD is wider than the dimension of the side sealing region 12A in the width direction WD, it is also as follows. Figure 1 and Figure 2 As shown, preferably, excess portions 12R that do not engage with each other and protrude from the side edges of the side sealing region 12A are provided on both sides of the outer body 12F in the front body piece F and on both sides of the outer body 12B in the rear body piece B. This is achieved by adding the side sealing region 12A and the excess portions 12R, such that the width direction WD of the region obtained by adding the side sealing region 12A and the excess portions 12R is more than 1 times but less than 2 times the width direction WD interval 90W of the linear joint regions 80 and 89. Therefore, even if the width direction WD interval 90W of the linear joint regions 80 and 89 is wider than the width direction WD of the side sealing region 12A, and the linear joint regions 80 and 89 are sometimes not located within the side sealing region 12A, the presence of the linear joint regions 80 and 89 on the excess portions 12R on their sides avoids the aforementioned problem. Furthermore, for the auxiliary fixation of the linear joint areas 80 and 89 based on the redundant portion 12R, it is preferable to make the linear joint areas 80 and 89 firmly fixed. Therefore, as mentioned above, it is preferable to use the fixing portion 84 to weld at least a portion 84m (or the whole) of the first piece 12S and the second piece 12H to the elastic member 15.

[0152] The planar shape of the weld point 70 is a perfect circle in the example shown, but it can be appropriately determined. For example, the planar shape of the weld point 70 can be an ellipse, star, cloud, or other shape, in addition to polygons such as triangles, quadrilaterals, and pentagons. In the case of a weld point 70 with angles, such as a polygon, the angles are preferably rounded. The weld point 70 is preferably such that the ratio of its dimension in the front-to-back direction LD to its dimension in the width direction WD is close to 1 (e.g., less than 1.3), like a perfect circle or a regular polygon.

[0153] The shape, size, and arrangement of the weld points 70 can be constant throughout the side sealing region 12A, or, while the shape, size, and arrangement of the weld points 70 are constant within a first range in the front-rear direction of the side sealing region 12A, the shape, size, and arrangement of the weld points 70 in a second range in the front-rear direction of the side sealing region 12A differ from those in the first range. Alternatively, weld points 70 with at least one different shape and size can exist mixed throughout part or all of the side sealing region 12A.

[0154] <Bufferability Evaluation Test>

[0155] right Figures 1-9 The outer casing with the structure shown is manufactured, and cut along the front-to-back direction at the center of the width direction of the front outer casing and the center of the width direction of the rear outer casing to produce a sample in which the left half of the front outer casing and the left half of the rear outer casing are joined by a side seal.

[0156] (Example)

[0157] • First sheet: Fineness 2.8 dtex, weight per unit area 15 g / m² 2 1. Spunbond nonwoven fabric.

[0158] • Second sheet: Fineness 2.8 dtex, weight per unit area 15 g / m² 2 1. Spunbond nonwoven fabric.

[0159] • The spacing between adjacent joints 81 in the width direction WD is 90W: 11 mm.

[0160] • The width direction WD dimension of the joint 81 is 80W: 1 mm

[0161] • Total amplitude α of the side edge of the wavy linear joint area: 4 mm

[0162] • Maximum elongation in the width direction (WD): 210%.

[0163] • The acute angle θ formed by the centerline 82 with zero displacement of the side edge and the front-rear direction LD is 5 degrees.

[0164] Wavelength λ: 46 mm.

[0165] (Comparative example)

[0166] Except as described below, the conditions are the same as in the embodiments.

[0167] • The spacing 90W between adjacent joints 81 in the width direction WD is 5.5 mm.

[0168] • The acute angle θ formed by the centerline 82 with zero displacement of the side edge and the front-rear direction LD: 0 degrees.

[0169] (Experimental Methods)

[0170] With the specimens of the examples and comparative examples stretched along the width direction in an elongated state (elongation rates of 135%, 150%, and 170%), after fixing one 10 mm cut end and another 10 mm cut end to a flat test plate using adhesive tape, a compression testing machine (KES-G5) manufactured by KATO TECH was used to test the specimens at T0: pressure 0.5 gf / cm². 2 Sample thickness (mm) and TM: Maximum pressure 50gf / cm 2 The sample thickness (mm) was measured, and the difference was calculated as an evaluation value for buffering capacity. Measurements were taken by aligning the center of the compressed component with the apex of one of the five folds of average thickness in the front-to-back direction, and the average value was used as the measured value. The measurement conditions were: DEF sensitivity: 20 mm / 10V, and compressive area of ​​the compressed component: 2 cm². 2 (Standard accessory compression component), measured load: 5.0 gf, sens: 2. Furthermore, conditions not described herein are the same in the examples and comparative examples.

[0171] (Experimental Results)

[0172] The test results are shown in Table 1. In the specimens of the examples, the decrease in the evaluation value of cushioning was small across all elongations from 135% to 175%. In contrast, in the specimens of the comparative examples, the result was that the evaluation value of cushioning decreased as the elongation increased.

[0173] [Table 1]

[0174] <Explanation of terms used in the instruction manual>

[0175] Unless otherwise specified in the instruction manual, the following terms in the instruction manual shall have the following meanings.

[0176] • “Front-back direction” refers to the direction indicated by the LD symbol in the figure (vertical direction), and “width direction” refers to the direction indicated by the WD symbol in the figure (left-right direction). The front-back direction is orthogonal to the width direction.

[0177] • "Front side" refers to the side of the disposable diaper that is closest to the wearer's skin when wearing a pant-type disposable diaper, while "back side" refers to the side of the disposable diaper that is furthest from the wearer's skin when wearing a pant-type disposable diaper.

[0178] • “Surface” refers to the side of the component that is closest to the wearer’s skin when wearing a panty-style disposable diaper, and “back” refers to the side of the component that is furthest from the wearer’s skin when wearing a panty-style disposable diaper.

[0179] • "Elongation" refers to the value when the natural length is set to 100%. For example, an elongation of 200% has the same meaning as an elongation ratio of 2.

[0180] • Weight per unit area is determined as follows: After pre-drying the sample or test piece, it is placed in a test chamber or apparatus under standard conditions (temperature 23 ± 1°C, relative humidity 50 ± 2%) to achieve a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight at an environment of 100°C. Alternatively, pre-drying may be omitted for fibers with a standard moisture regain of 0.0%. Using a template (100 mm × 100 mm) for sample selection, 100 mm × 100 mm samples are cut from the constant-weight test piece. The weight of the sample is measured, and the weight per square meter is calculated at 100 times the standard weight and used as the weight per unit area.

[0181] • Thickness was measured using an automatic compression testing machine (KATO TECH KES-G5) at a load of 0.098 N / cm. 2 and pressurized area: 2 cm 2 Automatic measurement is performed under the specified conditions.

[0182] • The water absorption was determined according to JIS K7223-1996 "Test method for water absorption of superabsorbent resins".

[0183] • "Unfolded state" refers to the state of being stretched to the elastic limit (in other words, the state of being relaxed and flat with no contraction (including all contractions such as contraction based on elastic components)).

[0184] • "Maximum elongation" refers to the elongation in the unfolded state.

[0185] Unless otherwise specified, the dimensions and positional relationships of each part refer to the dimensions and positional relationships in the unfolded state, not in the natural length state.

[0186] • In the absence of any record of the environmental conditions in the test or measurement, it shall be assumed that the test or measurement was conducted in a laboratory or apparatus under standard conditions (temperature 23 ± 1°C, relative humidity 50 ± 2%).

[0187] Industrial availability

[0188] This invention can be used for disposable underwear-type diapers, underwear-type sanitary products, and other disposable underwear-type items.

[0189] Explanation of reference numerals in the attached figures

[0190] 11…Impervious sheet, 12A…Side sealing area, 12B…Rear outer body, 12E…Waist extension, 12F, 12B…Outer body, 12F…Front outer body, 12H…Second sheet, 12R…Excess portion, 12S…First sheet, 13…Cover nonwoven fabric, 15, 17…Elastic member, 15…Elastic member below waist, 17…Waist elastic member, 18…Outer part, 19…Inner part, 200…Inner body, 201, 202…Inner body fixing part, 30…Top sheet, 40…Intermediate sheet, 50…Absorbent element, 56…Absorbent body, 58…Packaging sheet, 60…Stand-up pleats, 60A…Top side part, 60B…Root side part, 62…Pleated nonwoven fabric, 67…Flattened Part, 68… Free part, 70… Melting point, 71… Unit lattice, 72… Spacing area, 73… Lateral area, 75… Unit lattice group, 80, 89… Linear joint area, 80… Wavy linear joint area, 81… Joint, 82… Center line, 84… Fixing part, 90… Non-jointing area, A1… Non-stretchable area, A2… Stretchable area, B… Back panel, C… Hip cover, F… Front panel, HM… Hot melt adhesive, L… Middle area, LD… Front and back direction, LO… Leg opening, P… Pleats, P1… Base, T… Waist area, U… Lower waist, W… Waist, WD… Width direction, WO… Waist opening, it… Isosceles triangle, α… Total amplitude, λ… Wavelength.

Claims

1. A telescopic structure for a disposable wearable article, comprising a first piece, a second piece, and a plurality of elongated elastic members, the elastic members being spaced apart between the first and second pieces in an orthogonal direction orthogonal to the telescopic direction and extending along said telescopic direction, characterized in that, The telescopic structure has a telescopic region. In the telescopic region, continuous wavy linear joint regions are intermittently arranged along the telescopic direction, traversing the elastic member, and the entire area between adjacent wavy linear joint regions in the telescopic direction constitutes a non-jointed area. In the portions of each of the wavy linear joint areas that do not intersect with the elastic member, joints where the first piece and the second piece are fused together are provided intermittently or continuously along the orthogonal direction. The portions of each of the wavy linear joint areas that intersect with the elastic member constitute the fixing portions for securing the elastic member to the first piece and the second piece. The stretchable region is a region that contracts along the stretching direction due to the contraction of the elastic member and elastically stretches between its natural length state and its unfolded state. In its natural length state, the portions of the first and second pieces located in the non-joined region expand away from each other in opposite directions, forming continuous folds along the orthogonal direction. In its unfolded state, together with the elastic member, it stretches to its maximum elongation along the stretching direction, causing the folds to disappear. The interval between adjacent joints in the telescopic direction is 7~14 mm. The dimension of the joint in the telescopic direction is 0.04 to 0.3 times the interval between adjacent joints in the telescopic direction. The total amplitude of the side edge of the wavy linear joint region is 0.2 to 0.7 times the interval between adjacent joints in the expansion and contraction direction. The maximum elongation of the telescopic region in the telescopic direction is 200-240%.

2. The telescopic structure of the disposable wearable item according to claim 1, characterized in that, In all of the said wavy linear junction regions, the wavelength of the side edge is constant, the total amplitude of the side edge is twice the half amplitude and constant, and the acute angle between the center line with zero displacement of the side edge and the said orthogonal direction is 3 to 7 degrees.

3. The telescopic structure of the disposable wearable article according to claim 1 or 2, characterized in that, The joint where the first and second pieces are fused together extends over the entirety of each of the wavy joint areas and is intermittently arranged along the orthogonal direction at intervals shorter than the diameter of the elastic member at its natural length. The joint portion is closely connected to both sides of each elastic member in the orthogonal direction. In the fixing part, at least one of the first piece and the second piece is partially or entirely fused to the elastic member.

4. A disposable underwear-type garment, comprising: a ring-shaped waistband area formed by joining the sides of a front panel and the sides of a back panel; a middle region extending from the waistband area of ​​the front panel, through the crotch, to the waistband area of ​​the back panel; a waist opening located on the side of the waistband area opposite to the middle region; and leg openings located on both sides of the middle region in the width direction. The disposable underwear-type items include: An outer body, which at least forms the waist region; an inner body, which is attached to the outer body in such a manner that it extends from the middle portion of the front body piece in the width direction to the middle portion of the rear body piece in the width direction; and a side sealing region, which is formed by joining the inner surfaces of the two sides of the outer body piece in the front body piece and the two sides of the outer body piece in the rear body piece facing each other, characterized in that... The outer body of at least one of the front and back panels has a portion or all of its front-to-back direction in the region between the side sealing areas in a manner that extends throughout the width direction between the side sealing areas and in a manner that the stretching direction of the stretching area of ​​the stretching structure is the width direction of the underwear-type disposable article.

5. The disposable underwear-type garment according to claim 4, characterized in that, The outer body of the front panel and the outer body of the rear panel, in the region between the side sealing areas, have a portion or all of the telescopic structure as described in claim 2 in the front-rear direction, in a manner that extends throughout the width direction between the side sealing areas. When viewed from the front surface in the product state with the inner surfaces of the front body piece and the rear body piece in natural contact, the center lines of the wavy line joint areas in the telescopic structure of the outer body of the front body piece and the center lines of the wavy line joint areas in the telescopic structure of the outer body of the rear body piece are inclined in opposite directions relative to the orthogonal direction.

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