Absorbent article

Abstract

To provide an absorbent article which is easily worn, has comfort in wearing of the article, and can be easily detached regardless of a shape of an underwear and strength of a paste.SOLUTION: An absorbent article 10 comprises: an absorbent body 20; and right and left wings 30 having an adhesive layer. An angle θ1 between a first virtual straight line VL1 extending from a front start point A of the wing 30 and contacting the wing 30 from a front side, and a second virtual straight line VL2 extending forward through the front start point A from a rear start point B, is 100 degrees or more and 145 degrees or less. A second recess region 33a recessed forward in an arc shape relative to a third virtual straight line VL3 passing through rear start points B of both the right and left wings 30 extends continuously from the rear start points B. A length L2 from an intersection E between a fourth virtual straight light VL4 from a point C obtained by dividing a segment connecting the front start point A and the rear start point B in half and a center line CL of the absorbent body 20 to a front end D1 of the absorbent body 20, is 60 mm or more and 150 mm or less. An area of the adhesive layer is 150 mm2 or more and 600 mm2 or less.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to absorbent articles with wings. [Background technology]

[0002] Patent Document 1 discloses a sanitary napkin. This sanitary napkin has a napkin body formed by a top sheet, a back sheet, and an absorbent body sandwiched between these sheets and entirely covered with tissue, and also has a pair of wings coated with an adhesive surface for fixing the napkin body to underwear or the like when in use. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-290602 Summary of the Invention [Problem to be solved by the invention]

[0004] The crotch width of underwear varies depending on the design. In particular, in underwear with a narrow crotch width, the width of the absorbent main body excluding the wings of absorbent articles with wings differs significantly from the width of the crotch. Additionally, the leg openings often have a sharp curve. This can lead to the absorbent main body getting caught in the wings when worn, or the wings failing to fold where they should. Wearing an absorbent article in this state can result in deformation of the absorbent main body and a decrease in adhesive strength to the underwear, potentially leading to bodily fluid leakage and reduced comfort. Furthermore, if the left and right wings overlap when worn, putting on and taking off the article becomes difficult, and the article can rub against the skin after wearing, resulting in a poor wearing experience.

[0005] When wings of absorbent articles are peeled off from underwear, such as when changing the underwear, there is a risk that the wings may break or adhesive from the wings may remain on the underwear.

[0006] The sanitary napkin described in Patent Document 1 does not take into consideration various shapes of underwear, and when worn with underwear that has a narrow crotch width, the left and right wings may overlap when worn, or the wings may not be folded in the correct position, resulting in a decrease in adhesive strength or deformation of the absorbent body.

[0007] Therefore, an object of the present disclosure is to provide an absorbent article that is easy to put on, comfortable to wear, and easy to remove, regardless of the shape of the underwear or the strength of the adhesive. [Means for solving the problem]

[0008] In order to solve the above problems, an absorbent article according to a first aspect of the present invention comprises an absorbent main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, and left and right wings having an adhesive layer attachable to underwear and protruding outward in the width direction from both side edges in the width direction of the absorbent main body, wherein the angle between a first imaginary line extending from a front starting point of the wings from the side edges of the absorbent main body and contacting the wings from the front side, and a second imaginary line extending forward from a rear starting point of the wings from the side edges of the absorbent main body, passing through the front starting point, is 100 degrees or more and 145 degrees or less. and at least a portion of the outer edge of the wing extending continuously from the rear starting point is a concave region recessed in an arc shape forward of a third imaginary line passing through the rear starting points of both the left and right wings, and when a fourth imaginary line is extended from a point that bisects a line segment connecting the front starting point and the rear starting point of the wing to a center line connecting the front end and the rear end of the absorbent main body and passing through the center in the width direction of the absorbent main body, the length along the center line from the intersection of the center line and the fourth imaginary line to the front end of the absorbent main body is 60 mm or more and 150 mm or less, and the area of ​​the adhesive layer of each of the left and right wings is 150 mm or more. 2 Over 600mm 2 The following is the result.

[0009] A second aspect of the present invention is an absorbent article of the first aspect, wherein the length of the line segment connecting the front starting point and the rear starting point is 50 mm or more and 80 mm or less, and the length along the third imaginary straight line from the rear starting point to the outer end of the wing in the width direction is 30 mm or more and 50 mm or less.

[0010] A third aspect of the present invention is an absorbent article according to the first or second aspect, wherein the length of a perpendicular line extending from the apex of the concave region on the outer edge of the wing to the third imaginary line is 3 mm or more and 5 mm or less, the outer edge of the wing has a convex region that extends continuously outward in the width direction from the concave region and protrudes rearward in an arc shape, and the straight-line distance from the inflection point between the concave region and the convex region to the rear starting point is 15 mm or more and 20 mm or less. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to provide an absorbent article that is easy to put on, comfortable to wear, and easy to remove, regardless of the shape of the underwear or the strength of the adhesive. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a plan view of an absorbent article according to one embodiment of the present invention, viewed from the skin side. [Figure 2] FIG. 2 is a cross-sectional view taken along the line II-II in FIG. [Figure 3] 10A and 10B are diagrams showing modified examples of adhesive layers of wings. [Figure 4] FIG. 2 is an explanatory diagram of the dimensions of the absorbent article. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an absorbent article according to one embodiment of the present invention will be described with reference to the drawings.

[0014] In the description of this specification, "wearing an absorbent article" refers to the state in which the absorbent article is worn on the body, regardless of whether the absorbent article is worn before, during, or after absorbing bodily fluids. The "front-rear direction" of each component of the absorbent article refers to the direction along the front and back of the wearer when worn, which is the long-length direction of the absorbent article and is the direction indicated by arrow X in the figure. The "width direction" of each component of the absorbent article refers to the direction along the left and right of the wearer when worn, which is the short-length direction perpendicular to the front-rear direction and is the direction indicated by arrow Y in the figure. The "thickness direction" of each component of the absorbent article refers to the direction in which the components are stacked and is the direction indicated by arrow Z in the figure. The "inner side" in the width direction refers to the direction toward the center in the width direction, and the "outer side" refers to the direction away from the center in the width direction. The "skin side" of each component of the absorbent article refers to the direction toward the wearer's body when the absorbent article is worn, and the "non-skin side" refers to the direction opposite the skin side in the thickness direction. Body fluids refer to fluids excreted from the body, such as urine, blood, and water in loose stools.

[0015] Fig. 1 is a plan view of an absorbent article according to one embodiment of the present invention, seen from the skin side. Fig. 2 is a cross-sectional view taken along the line II-II in Fig. 1. Fig. 3 is a diagram showing a modified example of the adhesive layer of the wing.

[0016] <Absorbent articles> 1 and 2, an absorbent article 10 according to one embodiment of the present invention is a pad-type absorbent article 10 with wings that is attached to a wearer's underwear. Examples of the absorbent article 10 include light incontinence products such as absorbent napkins, light incontinence pads, and urine absorption pads, sanitary products such as sanitary napkins, and panty liners.

[0017] The absorbent article 10 comprises an absorbent main body 20 that mainly absorbs bodily fluids, and left and right wings 30 that are used to attach the absorbent main body 20 to underwear.

[0018] <Absorbent body> The absorbent main body 20 has a liquid-permeable top sheet 21 that is positioned on the skin side when worn, a liquid-impermeable back sheet 22 that is positioned on the non-skin side when worn, and an absorbent body 23 that is placed between the top sheet 21 and the back sheet 22. In addition to these, the absorbent main body 20 may also have a main body adhesive layer that is positioned on the non-skin side of the back sheet 22 and can be fastened to underwear, three-dimensional gathers that prevent side leakage of bodily fluids, a cover sheet that wraps the absorbent body 23, etc.

[0019] (Main body adhesive layer) The main body adhesive layer (not shown) is a layer that enables the absorbent main body 20 to be attached to underwear and is formed by applying an adhesive to the non-skin side of the absorbent main body 20. The adhesive that forms the main body adhesive layer is not particularly limited, but examples include hot-melt adhesives such as polyacrylic acid ester, vinyl acetate-ethylene copolymer, vinyl acetate-acrylic copolymer, polymethyl methacrylate, polystyrene, styrene-acrylic copolymer, polyester resin, epoxy resin, and butadiene-styrene copolymer. These may be used alone or in combination. When using the absorbent article 10, the absorbent main body 20 is placed on the skin side of the underwear, and the main body adhesive layer is attached to the skin side of the underwear. A removable sheet (such as release paper) may be attached to the main body adhesive layer of the absorbent main body 20 before use to protect the main body adhesive layer.

[0020] The shape of the absorbent main body 20 is not particularly limited, but is preferably a substantially rectangular or oval shape. The absorbent article 10 of this embodiment has an oval shape. Side edges 20a on both sides in the width direction of the absorbent main body 20 of this embodiment extend linearly in the front-to-rear direction and parallel to each other.

[0021] (Top sheet) The top sheet 21 is a liquid-permeable sheet-like substrate that allows bodily fluids to pass quickly toward the absorbent body 23 and diffuse the bodily fluids in the planar direction of the absorbent body 23. The top sheet 21 is preferably a substrate that is soft to the touch and does not irritate the skin so that it may come into direct contact with the wearer's skin. Examples of substrates include nonwoven fabrics such as air-through nonwoven fabrics, thermal-bonded nonwoven fabrics, and spun-bonded nonwoven fabrics; open-pore films such as open-pore polyethylene films; foamed films such as polyethylene foam and urethane foam; and multilayer sheets made by laminating two or more of these.

[0022] The surface of the top sheet 21 may be embossed or perforated to improve liquid permeability. Any known method can be used for embossing or perforating the top sheet 21 without limitation. Furthermore, to reduce irritation to the skin, the top sheet 21 may contain lotions, antioxidants, anti-inflammatory ingredients, pH adjusters, antibacterial agents, moisturizers, etc.

[0023] (back seat) The backsheet 22 may be formed using a liquid-impermeable substrate that prevents the body fluids held by the absorber 23 from wetting the wearer's clothing. Examples of such substrates include resin films and composite sheets that are laminates of resin films and nonwoven fabrics. The nonwoven fabrics used in the composite sheets may be made by any method, and examples include single-layer nonwoven fabrics such as spunbond nonwoven fabrics and meltblown nonwoven fabrics, composite nonwoven fabrics such as spunbond nonwoven fabric / meltblown nonwoven fabric laminates, and spunbond nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric laminates, as well as composite materials thereof. Examples of resin films include polyester, polyvinyl alcohol, polyethylene, polypropylene, and composite films of polyethylene and polypropylene.

[0024] Furthermore, in order to prevent stuffiness during wear, it is preferable that the back sheet 22 be breathable. To provide breathability to the back sheet 22, for example, a filler may be blended into the resin film of the base material, or the back sheet 22 may be embossed. An example of the filler is calcium carbonate, and the blending method may be any known method without limitation.

[0025] (absorber) Examples of the absorber 23 include a fluff absorber containing absorbent fibers and superabsorbent polymer (hereinafter sometimes referred to as "SAP"), and an SAP sheet in which SAP particles are fixed between liquid absorbent sheets.

[0026] The absorbent fibers are not particularly limited as long as they are generally used in absorbent articles such as sanitary napkins, disposable diapers, and urine absorption pads, and examples thereof include fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic nonwoven fabric, etc. Examples of fluff pulp include wood pulp (e.g., bleached coniferous kraft pulp (N-BKP) such as southern pine or Douglas fir), synthetic fiber, resin fiber, non-wood pulp, etc. that has been defibrated into a cotton-like state. Examples of liquid absorbent sheets include sheets composed of one or more of the above absorbent fibers.

[0027] The SAP is not particularly limited as long as it can absorb body fluids and prevent backflow, and examples thereof include polyacrylates, polyaspartates, (starch-acrylic acid) graft copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers, and saponified products thereof. Among these, from the viewpoint of absorption per weight, polyacrylates are preferred, alkali metal polyacrylates are more preferred, and sodium polyacrylate is even more preferred. The superabsorbent polymers can be used alone or in combination of two or more.

[0028] In the absorbent body 23, the absorbent fibers and SAP may be in the form of a mixture of absorbent fibers and SAP particles, or may be in the form of SAP particles fixed between absorbent fibers.

[0029] (Cover sheet) A cover sheet (not shown) may be provided to encase the absorbent body 23 in order to prevent leakage of SAP particles and stabilize the shape of the absorbent body 23. The base material of the cover sheet may be any hydrophilic material, such as tissue, absorbent paper, airlaid nonwoven fabric, or spunbond nonwoven fabric. Among these, spunbond nonwoven fabric is preferred. When multiple cover sheets are provided, the base materials of the multiple cover sheets may be the same or different. An ADL layer may be provided between the top sheet 21 and the cover sheet to quickly capture and distribute body fluids from the cover sheet side to the absorbent body 23 side.

[0030] (3D gathers) The absorbent body 20 may have left and right three-dimensional gathers on the skin-facing side to prevent side leakage of bodily fluids. In this case, the three-dimensional gathers are provided at both widthwise ends of the skin-facing side of the top sheet 21 so as to extend along the front-to-rear direction of the absorbent body 20.

[0031] <Left and right wings> The left and right wings 30 are used to attach the absorbent main body 20 to underwear, and protrude outward in the width direction from the side edges 20a on both sides in the width direction of the absorbent main body 20. The left and right wings 30 are preferably formed separately from the top sheet 21 of the absorbent main body 20, but are not limited to this. The left and right wings 30 have an adhesive layer 31 on the non-skin side (the non-skin side when unfolded; the same applies hereinafter) that can be attached to underwear.

[0032] The left and right wings 30 are provided symmetrically on the absorbent article 10, so in the following, only one will be described, and the description of the other will be omitted.

[0033] The wings 30 protrude rearward and outward in the width direction from the side edges 20a of the absorbent main body 20. The outer edges of the wings 30 have a first region 32 that extends from an origin A on the front side of the wing 30 (hereinafter referred to as the "front origin A") toward the rear (diagonally rearward) and outward in the width direction, and a second region 33 that extends continuously from the first region 32 to an origin B on the rear side of the wing 30 on the inside in the width direction (hereinafter referred to as the "rear origin B"). In other words, the wings 30 are formed in a substantially triangular shape in a plan view. The front origin A and the rear origin B are origins of the outer edges of the wings 30 from the side edges 20a of the absorbent main body 20, and are located on the side edges 20a of the absorbent main body 20.

[0034] The first region 32 on the outer edge of the wing 30 has a first concave region 32a that extends diagonally rearward continuously from the forward starting point A and is slightly recessed rearward in an arc shape, and a first convex region 32b that extends diagonally rearward continuously from the first concave region 32a and protrudes slightly forward in an arc shape.

[0035] The second region 33 on the outer edge of the wing 30 has a second recessed region (recessed region) 33a that extends continuously from the rear starting point B outward in the width direction and recesses forward in an arc-like shape, and a second convex region (convex region) 33b that extends continuously from the second recessed region 33a outward in the width direction, protrudes rearward in an arc-like shape, and is continuous with the first convex region 32b. The second recessed region 33a on the outer edge of the wing 30 is recessed in an arc-like shape forward from a third imaginary straight line VL3 (see FIG. 4 ) that passes through the rear starting points B of both the left and right wings 30. In other words, at least a portion of the outer edge of the wing 30 that extends continuously from the rear starting point B is a recessed region (second recessed region 33a) that is recessed in an arc-like shape forward from the third imaginary straight line VL3 that passes through the rear starting points B of both the left and right wings 30. By providing second recessed regions 33a in this manner, even if the leg openings of the underwear are sharply curved, the absorbent article 10 can be attached to the underwear without the fabric of the underwear being caught in the gap or the adhesive layer 31 of the wings 30 getting caught in the seams of the leg openings of the underwear. Note that rubber is often sewn into the seams of the leg openings of underwear, and if the adhesive layer 31 of the wings 30 gets caught in the seams of the leg openings of the underwear, the unevenness of the seam and the expansion and contraction of the rubber may reduce the peel strength (fastening strength) of the adhesive layer 31 of the wings 30.

[0036] (Adhesive layer) The adhesive layer 31 is a layer that enables the left and right wings 30 to be attached to underwear and is formed by applying an adhesive to the non-skin-facing side of the left and right wings 30. The adhesive that forms the adhesive layer 31 is not particularly limited, but examples include hot-melt adhesives such as polyacrylic acid ester, vinyl acetate-ethylene copolymer, vinyl acetate-acrylic copolymer, polymethyl methacrylate, polystyrene, styrene-acrylic copolymer, polyester resin, epoxy resin, and butadiene-styrene copolymer. These may be used alone or in combination. When using the absorbent article 10, the absorbent main body 20 is placed on the skin-facing side of the underwear, and the left and right wings 30 are folded toward the non-skin side and then inward, so that the adhesive layer 31 is attached to the non-skin-facing side of the underwear. A removable sheet (such as release paper) may be attached to the adhesive layer 31 of the left and right wings 30 before use to protect the adhesive layer 31. In this embodiment, as shown in Fig. 1, one rectangular adhesive layer 31 is provided on each side of the left and right wings 30 (two in total, left and right), but this is not limited to this. For example, as shown in Fig. 3, two rectangular adhesive layers 31 may be provided on each side of the left and right wings 30, aligned in the width direction, (four in total, left and right).

[0037] (adhesive layer area) The area of ​​the adhesive layer 31 of each of the left and right wings 30 is 150 mm 2 Over 600mm 2 The area of ​​the adhesive layer 31 is 150 mm 2 If the area of ​​the adhesive layer 31 is smaller than 600 mm, the area of ​​the adhesive layer 31 becomes too small, making it difficult to prevent the absorbent body 20 from slipping. 2 If the thickness is larger than this, the fastening strength will be stronger than necessary, and there is a possibility that the wings 30 will break, damage the underwear, or leave adhesive residue on the underwear when the wings 30 are peeled off from the underwear.

[0038] Next, we will explain the dimensions of the absorbent article 10. Figure 4 is an explanatory diagram of the dimensions of the absorbent article.

[0039] (Absorbent body dimensions) The length (maximum length) L1 in the front-to-rear direction of the absorbent main body 20 is preferably 140 mm or more and 300 mm or less. The length (maximum length) W1 in the width direction of the absorbent main body 20 is preferably 50 mm or more and 100 mm or less. By adjusting the dimensions of the absorbent main body 20 within the above ranges, it is possible to obtain a pad-type absorbent article 10 suitable for light incontinence products, sanitary products such as sanitary napkins, panty liners, and the like.

[0040] (angle of the outer edge of the front of the wing) The angle θ1 between a first imaginary line VL1, which extends from a front starting point A of the wing 30 and contacts a first region 32 on the outer edge of the wing 30 from the front, and a second imaginary line VL2, which extends forward from a rear starting point B, passing through the front starting point A, is between 100 degrees and 145 degrees. If the angle θ1 between the first imaginary line VL1 and the second imaginary line VL2 is less than 100 degrees, the wing 30 is more likely to break when peeled from the underwear, and the adhesive of the adhesive layer 31 is more likely to remain on the underwear. On the other hand, if the angle θ1 between the first imaginary line VL1 and the second imaginary line VL2 is greater than 145 degrees, it is not possible to ensure a sufficient area for the wing 30, which may make it difficult to attach or cause the wing 30 to slip off, thereby preventing the wing 30 from functioning properly.

[0041] (Front and rear position of the wing) Point C is the point obtained by bisecting the line segment connecting the front starting point A and the rear starting point B of the wing 30. Furthermore, center line CL is the center line that connects the front end D1 and the rear end D2 of the absorbent main body 20 and passes through the center of the absorbent main body 20 in the width direction. Furthermore, a virtual line extending from point C to intersect with center line CL at a right angle is defined as a fourth virtual line VL4. In this case, the length L2 along center line CL from intersection E of center line CL and the fourth virtual line VL4 to the front end D1 of the absorbent main body 20 is 60 mm or more and 150 mm or less. If the length L2 from intersection E to the front end D1 is less than 60 mm or greater than 150 mm, the wing 30 cannot be positioned in an ideal position when the absorbent article 10 is worn in the crotch area of ​​typical underwear, which adversely affects wearability, comfort, and slippage. Furthermore, if the length L2 from the intersection point E to the front end D1 is made smaller than 60 mm or larger than 150 mm, when the wing 30 is attached to the ideal position in the crotch area of ​​the underwear, the absorbent main body 20 will shift too far forward or backward, which may prevent the absorbent main body 20 from absorbing urine effectively.

[0042] (Length of base of wing) The length L3 of the line segment connecting the front starting point A and the rear starting point B (hereinafter referred to as "length L3 of the base end of the wing 30") is preferably 50 mm or more and 80 mm or less. If the length L3 of the base end of the wing 30 is less than 50 mm, the wing 30 will be more likely to break when peeled off from the underwear. Furthermore, the wing 30 will become unstable, making it difficult to put on, and the absorbent main body 20 will be more likely to slip off. On the other hand, if the length L3 of the base end of the wing 30 is greater than 80 mm, the wing 30 will catch on the curve of the leg opening of the underwear, and there is a possibility that the fabric of the underwear will be caught when the absorbent article 10 is put on.

[0043] (Wing width) The length W2 along the third imaginary straight line VL3 from the rear starting point B to the outer end of the wing 30 in the width direction (hereinafter referred to as the "widthwise length W2 of the wing 30") is preferably 30 mm or more and 50 mm or less. The widthwise length W2 of the wing 30 is the length along the third imaginary straight line VL3 from the intersection G of the fifth imaginary straight line VL5, which is extended from the outermost point F in the width direction of the wing 30 so as to intersect at right angles with the third imaginary line VL3, to the rear starting point B. If the widthwise length W2 of the wing 30 is less than 30 mm, it becomes difficult to fold the wing 30 back, resulting in a decrease in fit. Furthermore, it becomes difficult to firmly fasten the absorbent main body 20 to underwear, making the absorbent main body 20 more likely to slip. On the other hand, if the width W2 of the wings 30 is greater than 50 mm, the left and right wings 30 may overlap when the absorbent article 10 is attached to underwear, and sufficient fastening strength may not be obtained. Also, the left and right wings 30 may be too long when the absorbent article 10 is attached to underwear, making it difficult to attach.

[0044] (Shape of the second concave area on the outer edge of the wing 30) The length L4 of the perpendicular line extending from the apex H of the second recessed region 33a on the outer edge of the wing 30 to the third imaginary line VL3 is preferably 3 mm or more and 5 mm or less. If the length L4 from the apex H to the third imaginary line VL3 is less than 3 mm, the recess will be too shallow, which may result in the fabric of the underwear being caught when the absorbent article 10 is worn on the underwear, or the adhesive layer 31 of the wing 30 getting caught on the seam of the leg openings of the underwear. On the other hand, if the length L4 from the apex H to the third imaginary line VL3 is greater than 5 mm, the base end of the wing 30 will be more likely to break when the wing 30 is peeled off from the underwear.

[0045] (Shape of the second area of ​​the outer edge of the wing) The linear distance from the inflection point I between the second concave region 33a and the second convex region 33b on the outer edge of the wing 30 to the rear starting point B is preferably 15 mm or more and 20 mm or less. If the linear distance from the inflection point I to the rear starting point B is less than 15 mm, the fabric of the underwear may be caught when the absorbent article 10 is worn on the underwear. On the other hand, if the linear distance from the inflection point I to the rear starting point B is greater than 20 mm, it becomes difficult to ensure a sufficient area for the wing 30.

[0046] (angle of the outer edge of the rear of the wing) The angle θ2 (rear angle) between the center line CL and a sixth imaginary straight line VL6 that passes through the rear starting point B of the wing 30 and is tangent to the second region 33 of the outer edge of the wing 30 from the rear side is between 90 degrees and 100 degrees. By setting the angle θ2 between the sixth imaginary straight line VL6 and the center line CL within the above range, the operability of the absorbent article 10 is improved.

[0047] (Wing peel strength) The peel strength of the adhesive layer 31 of the wing 30 (hereinafter referred to as "the peel strength of the wing 30") is preferably 0.5 N or more and 2.5 N or less. If the peel strength of the wing 30 is less than 0.5 N, the fastening force of the wing 30 will be too weak, making it difficult to ensure the slippage prevention function of the absorbent article 10. On the other hand, if the peel strength of the wing 30 is greater than 2.5 N, it will be difficult to peel the wing 30 from the underwear, and there is a high possibility that the underwear will be damaged or adhesive will remain on the underwear.

[0048] The peel strength of the wing 30 can be measured by the T-peel test method specified in JIS K6854-3. First, only one wing 30 is cut out from the absorbent article 10, and a tail is attached to the cut-out wing 30 to create a sample. Next, the adhesive layer 31 of the sample's wing 30 is attached to a test cloth. Next, the test cloth with the attached sample is placed on a flat table, an acrylic plate is placed on top of it, and a pressure of 125 g / cm is applied from above the acrylic plate. 2 Then, a weight is placed on the surface so that the pressure (125g / cm 2) is applied, and 30 seconds later, the test fabric with the sample attached is set in a universal testing machine (trade name: Tensilon Universal Testing Machine, manufactured by A&D Co., Ltd.). Specifically, the tail portion of the sample is attached to one chuck of the universal testing machine, and the test fabric with the sample attached to the other chuck. Then, the wing 30 of the sample is peeled from the test fabric at a speed of 300 mm / min using a T-peel test method, and the integrated average load value is taken as the peel strength (N) of the wing 30.

[0049] In the absorbent article 10 configured as described above, the angle θ1 between the first virtual line VL1 and the second virtual line VL2 is 100 degrees or more and 145 degrees or less, the second recessed region 33a extends continuously from the rear starting point B of the wing 30 outward in the width direction, the length L2 from the intersection E to the front end D1 is 60 mm or more and 150 mm or less, and the area of ​​the adhesive layer 31 of the left and right wings 30 is 150 mm 2 Over 600mm 2 The following is the result.

[0050] Therefore, according to this embodiment, as described above, it is possible to provide an absorbent article 10 that is easy to put on, comfortable to wear, and easy to remove, regardless of the shape of the underwear or the strength of the glue.

[0051] Although the present invention has been described above based on the above embodiment, the present invention is not limited to the content of the above embodiment, and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. [Example]

[0052] The present embodiment will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0053] (Examples 1 to 8 and Comparative Examples 1 to 4) Absorbent articles of Examples 1 to 8 and Comparative Examples 1 to 4 were produced under the conditions shown in Table 1. A hot-melt adhesive was used as the adhesive for the adhesive layers of the left and right wings. Each absorbent article was evaluated in the following five ways (evaluation of "bonding strength," evaluation of "ease of putting on," evaluation of "wearing comfort," evaluation of "resistance to slipping," and evaluation of "ease of peeling").

[0054] (Joining strength) The "bond strength" was evaluated by a T-peel test using a universal testing machine (trade name: Tensilon Universal Testing Machine, manufactured by A&D Co., Ltd.). First, the absorbent article to be evaluated was attached to underwear with a crotch area made of 95% cotton and 5% polyurethane. The absorbent body (pad portion) was placed on the skin-facing side of the crotch area of ​​the underwear, and the left and right wings were folded and fastened to the non-skin-facing side of the crotch area. The absorbent body was then placed on a platform, and a 2 kg roller was rolled back and forth over the absorbent body to press the absorbent article to the underwear. The front end of the absorbent body was then attached to one chuck of the universal testing machine, and the crotch end of the underwear was attached to the other chuck. The articles were then peeled at a speed of 300 mm / min, and the maximum strength measured was the bond strength (N).

[0055] (Ease of wearing) The "ease of putting on" evaluation was a sensory evaluation by 20 monitors, who put each absorbent article on underwear and rated the ease of putting on each one on a three-point scale: 0 (difficult to put on), 1 (normal), and 2 (easy to put on). The total score for each absorbent article was then divided by the number of monitors (20 people) to obtain the result (rounded to one decimal place).

[0056] (Wearing comfort) The "wearing comfort" evaluation was a sensory evaluation by 20 monitors, who attached each absorbent article to their underwear and rated the wearing comfort of each article on a three-point scale: 0 (bad), 1 (average), and 2 (good). The total score for each absorbent article was then divided by the number of monitors (20 people) to obtain the result (rounded to one decimal place).

[0057] (Difficult to slip) The evaluation of "non-slip" was a sensory evaluation by 20 monitors, who attached each absorbent article to their underwear and rated the non-slip property of each absorbent article on a three-point scale: 0 (easy to slip), 1 (normal), and 2 (hard to slip). The total score for each absorbent article was then divided by the number of monitors (20 people) to obtain the result (rounded to one decimal place).

[0058] (Ease of peeling) The "ease of removal" evaluation was a sensory evaluation by 20 monitors, who attached each absorbent article to underwear, wore it, and then removed it from the underwear, rating the ease of removal on a three-point scale: 0 (difficult to remove), 1 (normal), and 2 (easy to remove). The total score for each absorbent article was then divided by the number of monitors (20 people) to obtain the result (rounded to one decimal place).

[0059] (Pass / Fail) If any of the results of the above four sensory evaluations was less than 1.0, it was marked as "X", and if all were 1.0 or higher, it was marked as "O".

[0060] The results are shown in Table 1. The "crotch width" in Table 1 is the measurement taken at the narrowest point of the crotch area of ​​the underwear. The term "pad" refers to the absorbent body, and the term "pad length" refers to the length of the absorbent body in the front-to-rear direction. The term "angle θ1" refers to the angle θ1 between the first imaginary line VL1 and the second imaginary line VL2. The term "length L4" refers to the length L4 from the apex H of the second recessed region to the third imaginary line VL3. The term "position L2" refers to the front-to-rear position of the wing, and refers to the length L2 along the center line CL from the intersection E of the absorbent body's center line CL and the fourth imaginary line VL4 to the front end D1 of the absorbent body. The term "HM area" refers to the area of ​​the adhesive layer of each wing. The term "AB length" refers to the length of the base end of the wing, and refers to the length L3 of the line segment connecting the front starting point A and the rear starting point B of the wing. "BG length" is the widthwise length of the wing, and indicates the length W2 along the third virtual line VL3 from the rear starting point B of the wing mentioned above to the intersection G between the fourth virtual line VL4 and the third virtual line VL3.

[0061] [Table 1]

[0062] As can be seen from Table 1, the present disclosure confirms that it is possible to provide absorbent articles that are easy to wear, comfortable to wear, and easy to remove, regardless of the shape of the underwear or the strength of the adhesive. [Explanation of symbols]

[0063] 10: Absorbent articles 20: Absorbent body 20a: Side edge 21: Top sheet 22: Back seat 23: Absorbent 30: Left and right wings 31: Adhesive layer 33a: Second concave area (concave area) 33b: Second convex region (convex region)

Claims

1. an absorbent body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet; The absorbent body has an adhesive layer that can be attached to underwear, and has left and right wings that protrude outward in the width direction from both side edges in the width direction of the absorbent body, an angle between a first imaginary line extending from a front starting point of the wing from the side edge of the absorbent main body and tangent to the wing from the front side and a second imaginary line extending from a rear starting point of the wing from the side edge of the absorbent main body, passing through the front starting point, and forward is 100 degrees or more and 145 degrees or less; at least a portion of an outer edge of the wing that extends continuously from the rear starting point is a concave region that is recessed in an arc shape forward of a third imaginary line that passes through the rear starting points of both the left and right wings, When a fourth imaginary straight line is extended from a point that bisects a line segment that connects the front starting point and the rear starting point of the wing to a center line that connects the front end and the rear end of the absorbent main body and passes through the center in the width direction of the absorbent main body, the length along the center line from the intersection point of the center line and the fourth imaginary straight line to the front end of the absorbent main body is 60 mm or more and 150 mm or less, The area of ​​the adhesive layer on each of the left and right wings is 150 mm ２ Over 600mm ２ is An absorbent article characterized by:

2. The length of the line segment connecting the front starting point and the rear starting point is 50 mm or more and 80 mm or less, The length along the third imaginary line from the rear starting point to the outer end of the wing in the width direction is 30 mm or more and 50 mm or less.

2. The absorbent article according to claim 1.

3. a length of a perpendicular line extending from a vertex of the recessed region of the outer edge of the wing to the third imaginary line is 3 mm or more and 5 mm or less; the outer edge of the wing has a convex region that extends continuously outward in the width direction from the concave region and protrudes rearward in an arc shape, The linear distance from the inflection point between the concave region and the convex region to the rear starting point is 15 mm or more and 20 mm or less.

3. The absorbent article according to claim 1 or claim 2.

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