Absorbent article

Abstract

To provide an absorbent article satisfying high standards in all of adhesive strength to underwear, less transfer (adhesive residue) of an adhesive layer to the underwear, and breathability while suppressing a material cost.SOLUTION: An absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between the top sheet and the back sheet, an adhesive layer provided on a non-skin-side surface of the back sheet, and a release sheet covering the adhesive layer, where the back sheet is an air-permeable plastic film, a ratio of an area of the adhesive layer to an area of the back sheet is 20% or more and 45% or less, a ratio of an area of the adhesive layer to an area of the release sheet is 50% or more and 70% or less, and a coating amount of an adhesive for forming the adhesive layer is 20 g / m2 or more and 60 g / m2 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Currently, various types of absorbent articles are available on the market, including sanitary products and nursing care products.

[0003] Among these, absorbent articles that are worn inside underwear are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet that is positioned on the non-skin side when worn, and an absorbent body that is placed between the top sheet and the back sheet, and by attaching the underwear to an adhesive layer provided on the non-skin side of the back sheet, it is possible to prevent the underwear from slipping during use.

[0004] For example, Patent Document 1, which is a prior art document for an absorbent article having an adhesive layer, describes an absorbent article having a top sheet located on the surface that contacts the human body, a back sheet located on the opposite side of the top sheet that contacts the underwear, an absorbent body interposed between the top sheet and the back sheet, and a slip-preventing section provided on the underwear-contacting surface of the back sheet and coated with adhesive, in which the back sheet is made up of two layers: a nonwoven fabric layer that is located on the underwear side, and a film layer that is bonded to the nonwoven fabric layer and is located on the absorbent body side, the slip-preventing section is formed in an exposed section where the film layer is exposed from the nonwoven fabric layer, the exposed section is formed by hollowing out the nonwoven fabric layer, and adhesive is coated on the entire surface of the exposed section where the slip-preventing section will be formed, and the film layer has a basis weight of 15 to 25 g / m 2 The total weight of the film layer and nonwoven fabric layer is 40 g / m 2 Disclosed is an absorbent article characterized in that:

[0005] Patent Document 2 also discloses an absorbent product having a central portion, a first end portion and a second end portion, for being worn in the crotch area of clothing, comprising an absorbent core, a backsheet combined with the absorbent core, and adhesive attachment means placed on the backsheet for attaching the absorbent product to the clothing, wherein the adhesive attachment means comprises an adhesive pattern in the shape of a capital letter I, the shape of which has an adhesive base located at the first end portion of the absorbent product, an adhesive stem located at the center of the central portion of the absorbent product, and an adhesive head located at the second end portion of the absorbent product, the adhesive base and adhesive head comprising roughly rectangular areas that cross each of the located ends, and the area of the rectangular areas at the ends accounting for at least about 50% of the effective adhesive area at each end. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4533653 [Patent Document 2] Japanese Utility Model Application Publication No. Hei 9-000211 Summary of the Invention [Problem to be solved by the invention]

[0007] Hot melt adhesive is mainly used to form the adhesive layer, which must have an appropriate adhesive strength so that it will not come off from the underwear due to the wearer's movements, yet be easy to remove after use, and the hot melt adhesive must not transfer to the underwear when removed (no glue remains).

[0008] Furthermore, for absorbent articles, it is important that they do not become stuffy when worn, and for this reason, breathable films are sometimes used for the backsheet, but even if a breathable film is used for the backsheet, the breathability is reduced when a hot melt adhesive is applied.

[0009] Therefore, when an attempt is made to increase the adhesive strength by increasing the area where the hot melt adhesive is applied, there is a problem in that the breathability deteriorates. However, if the surface area is reduced to ensure breathability while the coating weight (amount of coating) is increased to improve strength, the hot melt adhesive becomes more likely to break when removed from the underwear, and glue is more likely to remain on the underwear.

[0010] To address this issue, Patent Document 1 mentioned above ensures breathability by using a sheet laminated with nonwoven fabric and film as the back sheet, but this type of lamination process increases manufacturing costs.

[0011] In addition, the above-mentioned Patent Document 2 uses an I-shaped adhesive layer to achieve both breathability and adhesive strength, but for such an adhesive layer, the release paper for covering the hot melt adhesive needs to be wide, which also increases manufacturing costs and is undesirable.

[0012] The present invention has been made in consideration of the above circumstances, and aims to provide an absorbent article that satisfies high standards of adhesive strength to underwear, minimal transfer of the adhesive layer to underwear (adhesive residue), and breathability, while keeping material costs down. [Means for solving the problem]

[0013] The inventors have conducted extensive research and have found that in an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body disposed between the top sheet and the back sheet, an adhesive layer provided on the non-skin side of the back sheet, and a release sheet covering the adhesive layer, by using a breathable plastic film for the back sheet and further specifying the ratio of the area of the adhesive layer to the area of the back sheet, the ratio of the area of the adhesive layer to the area of the release sheet, and the coating amount of adhesive for forming the adhesive layer all within predetermined numerical ranges, it is possible to produce an absorbent article that satisfies high standards in adhesive strength to underwear, minimal transfer of the adhesive layer to underwear (adhesive residue), and breathability while keeping material costs down, and have completed the present invention. That is, the present invention provides the following.

[0014] (1) A first aspect of the present invention is an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body disposed between the top sheet and the back sheet, an adhesive layer provided on the non-skin-side surface of the back sheet, and a release sheet covering the adhesive layer, wherein the back sheet is a breathable plastic film, the ratio of the area of the adhesive layer to the area of the back sheet is 20% to 45%, the ratio of the area of the adhesive layer to the area of the release sheet is 50% to 70%, and the coating amount of adhesive for forming the adhesive layer is 20 g / m 2 More than 60g / m 2 The absorbent article is characterized by the following:

[0015] (2) A second aspect of the present invention is an absorbent article according to (1), characterized in that the adhesive layer includes a linear adhesive layer having a linear shape, and the value obtained by dividing the perimeter of the linear adhesive layer by the area of the linear adhesive layer is 0.6 or less.

[0016] (3) A third aspect of the present invention is the absorbent article according to (1), characterized in that the dimension of the release sheet in the width direction is 45 mm or more and 75 mm or less.

[0017] (4) A fourth aspect of the present invention is the absorbent article according to (2), characterized in that the linear adhesive layer has a width dimension of 5 mm or more and 25 mm or less. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide an absorbent article that satisfies high standards of adhesive strength to underwear, minimal transfer of the adhesive layer to underwear (adhesive residue), and breathability, while keeping material costs down. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a plan view showing the appearance of an absorbent article according to a first embodiment of the present invention, as viewed from the skin side. [Figure 2] 2 is a schematic cross-sectional view in the width direction taken along the Y1-Y1 cutting line in FIG. 1. [Figure 3] 2 is a plan view of a backsheet included in the absorbent article of FIG. 1, viewed from the non-skin side. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, the form for carrying out the present invention (hereinafter referred to as the embodiment) will be described in detail with reference to the drawings. However, these are presented for the purpose of illustration only and are not intended to limit the present invention.

[0021] In the description of this specification, the longitudinal direction of the absorbent article 1 refers to the direction extending from the front to the back of the wearer when the absorbent article 1 is worn, and is the direction indicated by the symbol X in the drawings. The width direction of the absorbent article 1 refers to the direction horizontal to or perpendicular to the longitudinal direction, and is the direction indicated by the symbol Y in the drawings. Furthermore, the skin side refers to the side of each component of the absorbent article 1 that faces the skin of the wearer when worn, and the non-skin side refers to the side of each component of the absorbent article 1 that faces the opposite side from the skin of the wearer (underwear side) when worn. Furthermore, examples of the absorbent article 1 include light incontinence products and sanitary napkins in particular.

[0022] <Absorbent articles> Fig. 1 is a plan view of an absorbent article 1 according to an embodiment of the present invention, viewed from the top sheet 10 side, and Fig. 2 is a cross-sectional view taken along the Y1-Y1 cutting line in Fig. 1. The absorbent article 1 of the present invention comprises a liquid-permeable top sheet 10, a liquid-impermeable back sheet 20, an absorbent body 30 disposed between the top sheet 10 and the back sheet 20, an adhesive layer 40 provided on the non-skin side of the back sheet 20, and a release sheet 50 covering the adhesive layer 40. The shape of the absorbent article is not particularly limited, but it is preferable that the absorbent article be roughly hourglass-shaped, having a constricted region 2 in the center and wide regions 3 at both longitudinal ends of the constricted region 2, as shown in Figure 1.

[0023] The longitudinal dimension L1 of the absorbent article 1 is preferably 150 mm or more and 400 mm or less. The minimum width dimension L2 of the waisted region 2 of the absorbent article 1 (hereinafter simply referred to as the "width dimension L2") is preferably 50 mm or more and 130 mm or less, and the maximum width dimension L3 of the front and rear wide regions 3a, 3b (hereinafter simply referred to as the "width dimension L3") is preferably 60 mm or more and 180 mm or less. Furthermore, it is preferable that the ratio (%) of the widthwise dimension L3 of the front and rear wide regions 3a, 3b to the widthwise dimension L2 of the constricted region 2 is 103% or more and 130% or less. By adjusting the dimensions of the absorbent article 1 to fall within the above range, an absorbent article 1 suitable for use as a light incontinence product or a sanitary napkin can be obtained.

[0024] 1 and 2, the absorbent article 1 may also be provided with a pair of three-dimensional gathers 60 having elastic members for the three-dimensional gathers on the top sheet 10 along the longitudinal direction of the absorbent article 1, in order to prevent side leakage of bodily fluids excreted by the wearer. The three-dimensional gather sheet is arranged so that the outer ends of the three-dimensional gathers 60 in the width direction of the absorbent article 1 are fixed to the back sheet 20, the inner ends are fixed to the top sheet 10, and the centers are free ends that are not fixed to the top sheet 10. By providing the elastic members for the three-dimensional gathers along the longitudinal direction, the three-dimensional gathers 60 have the ability to stand up and can be deformed to fit the body shape of the wearer. As the elastic member for the standing gathers, for example, a thermal bonded nonwoven fabric, a spun bonded nonwoven fabric, a polyethylene film, or a sheet formed by combining and bonding these sheets can be used. From the viewpoint of strength and processability, the basis weight of the nonwoven fabric portion of the standing gathers 60 is set to 10 g / m 2 More than 20g / m 2 It is preferable that:

[0025] (Top sheet) The top sheet 10 may be formed from a liquid-permeable substrate that allows urine to move into the absorbent body 30, and may be, for example, a known hydrophilic nonwoven fabric such as a thermal-bonded nonwoven fabric or a spun-bonded nonwoven fabric. Furthermore, the surface of the top sheet 10 may be embossed or perforated to improve liquid permeability. Any known method can be used for embossing or perforating the top sheet 10 without limitation. Furthermore, to reduce irritation to the skin, the top sheet 10 may contain lotions, antioxidants, anti-inflammatory ingredients, pH adjusters, antibacterial agents, moisturizers, and the like. From the viewpoints of strength, processability, and liquid return, the basis weight of the top sheet 10 is 15 g / m 2 More than 40g / m 2 Preferably, it is 18 g / m or less. 2 More than 33g / m 2 The following is more preferable: There are no particular restrictions on the shape of the top sheet 10, as long as it has a shape that covers the absorbent body 30 and is necessary to guide bodily fluids to the absorbent body 30 without leakage.

[0026] (back seat) The backsheet 20 may be formed using a liquid-impermeable substrate that prevents body fluids held by the absorber 30 from wetting clothing, but the absorbent article 1 of the present invention uses a breathable plastic film. Examples of materials for the plastic film include liquid-impermeable polyethylene film.

[0027] From the viewpoint of strength and processability, the basis weight of the back sheet 20 is 25 g / m 2 More than 40g / m 2 Preferably, it is 30 g / m or less. 2 More than 35g / m 2 The following is more preferable: To provide breathability to the back sheet 20, for example, a filler may be blended into the resin film of the base material, or the back sheet 20 may be embossed. An example of the filler is calcium carbonate, and the blending method may be any known method without limitation.

[0028] (absorber) In the absorbent article 1 of the present invention, the maximum width dimension in the longitudinal direction of the absorbent body 30 is preferably 200 mm to 380 mm, more preferably 220 mm to 350 mm. The maximum width dimension in the width direction of the absorbent body 30 is preferably 40 mm to 120 mm, more preferably 50 mm to 110 mm.

[0029] (absorbent fiber) The absorbent body 30 contains absorbent fibers as a base material and a superabsorbent polymer (SAP). The absorbent fiber is not particularly limited as long as it is one 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, and hydrophilic nonwoven fabric. Among these, fluff pulp is preferably used from the viewpoint of absorbency. Examples of fluff pulp include wood pulp (e.g., bleached coniferous kraft pulp (N-BKP) such as southern pine and Douglas fir), synthetic fiber, resin fiber, and non-wood pulp defibrated into a cotton-like state. When fluff pulp is used as the absorbent fiber base material in the absorbent body 30, the basis weight of the absorbent fiber is 100 g / m 2 More than 800g / m 2 Preferably, it is 200 g / m or less. 2 More than 750g / m 2 This allows the fabric to absorb more body fluids without impairing the feel against the skin.

[0030] (Superabsorbent polymer) There are no particular limitations on the superabsorbent polymer of the absorber 30 as long as it can absorb body fluids and prevent backflow, and it is possible to use those formed from materials such as sodium polyacrylate, polyaspartate, (starch-acrylic acid) graft copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer, and saponified products thereof. Among these, sodium polyacrylate is preferred from the viewpoint of absorption capacity per weight. Furthermore, in the absorbent body 30, the ratio of the weight of the superabsorbent polymer to the weight of the entire absorbent body 30 (weight of superabsorbent polymer / weight of the entire absorbent body 30 x 100 (%)) is preferably 20% or more, and more preferably 30% or more and 55% or less.

[0031] In the absorbent body 30, the absorbent fibers and SAP may be in the form of a mixture of absorbent fibers and SAP particles, or may be a SAP sheet in which SAP particles are fixed between absorbent fibers. Furthermore, a carrier sheet (not shown) may be provided under the absorbent body 30 to prevent leakage of SAP particles and stabilize the shape of the absorbent body 30. The substrate of the carrier sheet may be any hydrophilic material, such as tissue, absorbent paper, or hydrophilic nonwoven fabrics such as air-laid nonwoven fabrics. When multiple carrier sheets are provided, the substrates of the multiple carrier sheets may be the same or different.

[0032] (Adhesive layer) The absorbent article 1 of the present invention has an adhesive layer 40 provided on the non-skin side of the backsheet 20. The adhesive layer 40 is formed by applying a hot melt adhesive (hereinafter also simply referred to as "adhesive"). At this time, the formation pattern of the adhesive layer 40 is not particularly limited, but the pattern shown in Fig. 3(a) or the pattern shown in Fig. 3(b) is particularly preferable.

[0033] The coating amount of adhesive for forming the adhesive layer 40 is 20 g / m 2 More than 60g / m 2 The coating weight is 20 g / m 2 If the coating amount is less than 60 g / m, the adhesive strength of the adhesive layer 40 will be insufficient, and the absorbent article 1 will be prone to slippage when worn. 2 If the thickness exceeds this, adhesive residue is likely to remain when the absorbent article 1 is peeled off from underwear after use.

[0034] The coating amount of the adhesive can be measured by the following method. First, the backsheet 20 is removed from the absorbent article 1 and its weight is measured. Next, the area of the adhesive layer 40 is measured using a JIS-compliant metal ruler or the like. After that, the hot melt adhesive on the adhesive layer 40 is wiped off with a nonwoven fabric or the like soaked in an organic solvent, and completely removed from the backsheet 20. Finally, after air drying, the weight of the backsheet 20 is measured again, and the coating amount (basis weight) of the adhesive is calculated. Note that the measurement is performed five times, and the average of these is used as the measured value. The weight measurement and air drying are performed in an environment of 23°C and 50% RH.

[0035] The hot melt adhesive used to form the adhesive layer 40 is preferably one whose main component is, for example, a styrene polymer, a tackifier, or a plasticizer. Examples of styrene-based polymers include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, and styrene-isobutylene-styrene copolymers. Only one of these may be used, or two or more may be blended together. Furthermore, as the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of tackifiers include C5 petroleum resins and C9 petroleum resins, and examples of plasticizers include monomer plasticizers such as dibutyl phthalate and dioctyl phthalate, as well as polymer plasticizers such as vinyl polymers and polyesters.

[0036] The ratio of the area of the adhesive layer 40 to the area of the back sheet 20 is 20% or more and 45% or less. If the ratio is less than 20%, the adhesive strength of the adhesive layer 40 will be insufficient, and the absorbent article 1 will be prone to slippage when worn. If the ratio exceeds 45%, the breathability of the back sheet 20 will decrease, and the absorbent article 1 will be prone to becoming stuffy when worn. In this case, the area of the adhesive layer 40 means the total area of all adhesive layers 40 formed on the non-skin side of the backsheet 20. The area of the backsheet 20 is calculated by preparing paper or film with a known basis weight, copying the shape of the backsheet 20, cutting the paper (film) to the shape of the backsheet 20, measuring the weight of the paper (film), and then calculating the area of the backsheet 20 from the measured value.

[0037] Furthermore, when applying the hot melt adhesive to form the adhesive layer 40, it may be spread evenly over a specific area, but it is preferable to apply it in a line to form a linear adhesive layer 41, as shown in Figures 3(a) and 3(b) (i.e., the adhesive layer 40 includes a linear adhesive layer 41 that is linear in shape).

[0038] In this case, it is preferable that the value obtained by dividing the circumferential length of the linear adhesive layer 41 by the area of the linear adhesive layer 41 is 0.6 or less. If the value exceeds 0.6, adhesive residue is likely to remain when the absorbent article 1 is peeled off from underwear after use. In this case, the perimeter of the linear adhesive layer 41 refers to the perimeter of one of the linear adhesive layers 41 included in the adhesive layer 40 (if the linear adhesive layer 41 is substantially rectangular, this is the longitudinal dimension (mm) × 2 + width dimension (mm) × 2), and the area of the linear adhesive layer 41 refers to the area of the linear adhesive layer 41 measured for its perimeter (if the linear adhesive layer 41 is substantially rectangular, this is the longitudinal dimension (mm) × width dimension (mm)). Furthermore, if the adhesive layer 40 includes a plurality of linear adhesive layers 41, it is preferable that the value obtained by dividing the perimeter of each linear adhesive layer 41 by the area of the linear adhesive layer 41 be 0.6 or less.

[0039] Furthermore, it is preferable that the width dimension of the linear adhesive layer 41 is 5 mm or more and 25 mm or less. If the dimension is less than 5 mm, adhesive residue is likely to remain when the absorbent article 1 is peeled off from underwear after use. If the dimension exceeds 25 mm, the breathability of the back sheet 20 decreases, and the absorbent article 1 is likely to become stuffy when worn.

[0040] Furthermore, when the adhesive layer 40 is divided into three equal parts along the width direction of the back sheet 20, the ratio of the area of the central part to the entire area of the adhesive layer 40 is preferably 40% or more and 60% or less. If the ratio is less than 40%, the adhesive strength at the central part is insufficient, and the absorbent article 1 is likely to slip when worn. If the ratio exceeds 60%, the breathability of the back sheet 20 decreases, and the absorbent article 1 is likely to become stuffy when worn.

[0041] Furthermore, when the adhesive layer 40 is divided into three equal parts along the longitudinal direction of the back sheet 20, the ratio of the area of the central part to the entire area of the adhesive layer 40 is preferably 20% or more and 40% or less. If the ratio is less than 20%, the adhesive strength at the central part is insufficient, and the absorbent article 1 is likely to slip when worn. If the ratio exceeds 40%, the breathability of the back sheet 20 decreases, and the absorbent article 1 is likely to become stuffy when worn.

[0042] When adhesive layer 40 is adhered to a cotton cloth simulating underwear, the peel strength is preferably 1.5 N or more and 5 N or less. If the peel strength is less than 1.5 N, the adhesive strength of adhesive layer 40 is insufficient, and absorbent article 1 is likely to slip off when worn. If the peel strength exceeds 5 N, absorbent article 1 becomes difficult to peel off from underwear. The peel strength can be adjusted by changing the amount and area of the hot melt adhesive applied to form the adhesive layer 40, and the composition of the hot melt adhesive.

[0043] When the adhesive layer 40 is adhered to a cotton cloth, the peel strength can be measured by the following method. The adhesive layer 40 of the absorbent article 1 is placed on cotton (Kanakin No. 3) conforming to JIS L0308, and a 2 kg roller is rolled back and forth once to obtain a test piece. Then, a T-peel test is performed on the absorbent article 1 from the Kanakin No. 3 using a Tensilon at a speed of 300 (mm / min), and the integrated average is taken as the peel strength. The test is performed three times and the average is taken as the measured value.

[0044] (Release sheet) The absorbent article 1 of the present invention includes a release sheet 50 that covers the adhesive layer 40 .

[0045] The release sheet 50 is preferably a film, paper, nonwoven fabric, or a laminate thereof, and among these, a film or paper is more preferred.

[0046] The width of the release sheet 50 is preferably 45 mm or more and 75 mm or less. If the width is less than 45 mm, the adhesive strength of the adhesive layer 40 will be insufficient, and the absorbent article 1 will be prone to slippage when worn. If the width exceeds 75 mm, it will be cost-inefficient. The longitudinal dimension of the release sheet 50 is not particularly limited, but is preferably 200 mm or more and 350 mm or less.

[0047] Furthermore, the ratio of the area of the adhesive layer 40 to the area of the release sheet 50 is 50% or more and 70% or less. If the ratio is less than 50%, the area of the release sheet 50 is not used effectively even though the release sheet 50 is too large, which is cost-effective. If the ratio is more than 70%, the release sheet 50 is too small and difficult to peel off.

[0048] The basis weight of the release sheet 50 is 18 g / m in the case of a film or nonwoven fabric from the viewpoint of strength and processability. 2 More than 35g / m 2 For paper, 35 g / m 2 More than 50g / m 2 It is preferable that the temperature is about the same or less. It is preferable that a release agent be applied to the entire skin-facing side of the release sheet 50. By applying the release agent, when the release sheet 50 is peeled from the back sheet 20, the adhesive layer 40 remains reliably on the non-skin-facing side of the back sheet 20, making it easier to attach the absorbent article 1 to underwear. It is preferable that the release agent be a silicone-based release agent or a fluorine-based release agent.

[0049] <Method for manufacturing absorbent articles> The absorbent article 1 can be manufactured in the same manner as conventional absorbent articles that are attached to underwear. For example, the absorbent article 1 can be obtained by a manufacturing method including the steps of applying a hot melt adhesive to the non-skin side of the back sheet 20 to form an adhesive layer 40, and then attaching a release sheet 50, laminating the back sheet 20, absorber 30, and top sheet 10 in a predetermined order, and joining the top sheet 10 and back sheet 20. The absorbent article 1 thus obtained is folded in a predetermined order and packaged into a product.

[0050] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention. [Example]

[0051] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the examples shown below.

[0052] The absorbent articles of each example and each comparative example have a common configuration, firstly, a back sheet having a basis weight of 30 g / m 2 A breathable polyethylene film was used.

[0053] Next, a hot melt adhesive (styrene-isobutylene-styrene copolymer) was applied to the non-skin side of the back sheet in the pattern shown in FIG. 3 to form an adhesive layer, and then a release sheet was attached.

[0054] Next, a top sheet with a basis weight of 25 g / m 2 The thermal bond nonwoven fabric is used, and between the top sheet and back sheet, an absorbent body made of a mixture of 6.0g of fluff pulp and 5.0g of highly absorbent polymer made of polyacrylic acid resin, and a carrier sheet (basis weight 16g / m) that wraps the absorbent body are placed. 2The absorbent article was prepared by placing the tissue. Finally, the absorbent articles thus produced were subjected to the following sensory evaluation.

[0055] (Slippage when worn) A survey was conducted on 30 test subjects who had worn absorbent articles, and if 20 or more people answered that no slippage had occurred, it was marked as "OK," and if 19 or fewer people answered that no slippage had occurred, it was marked as "X."

[0056] (Sweatiness when worn) A survey was conducted on 30 monitors who had worn the absorbent articles, and if 20 or more people answered that the product was less likely to get stuffy, it was marked as "OK," and if 19 or fewer people answered that it was "NG."

[0057] (Economics) When the ratio of the area of the adhesive layer to the area of the release paper shown in Tables 1 and 2 was 50% or more, it was marked with a circle, and when it was less than 50%, it was marked with an X.

[0058] (Less adhesive residue) A questionnaire was administered to 30 test subjects who had worn the absorbent article, and if 20 or more people answered that no glue remained on the underwear when the absorbent article was removed from the underwear after use, it was marked as "OK," and if 19 or fewer people answered that no glue remained on the underwear, it was marked as "X."

[0059] (Ease of peeling off release paper) Thirty monitors wearing the absorbent articles were asked to each peel off the release paper from the absorbent articles, and then a questionnaire was administered.If 20 or more people answered that it was easy to peel off, it was marked as ``OK'', and if 19 or fewer people answered ``X''.

[0060] The results of the above evaluation are shown in Tables 1 and 2. [Table 1]

[0061] [Table 2]

[0062] From the results in Tables 1 and 2, it was confirmed that the absorbent article of the present invention can provide an absorbent article that satisfies high standards in adhesive strength to underwear, minimal transfer of the adhesive layer to underwear (adhesive residue), and breathability, while keeping material costs down. [Explanation of symbols]

[0063] 1. Absorbent articles 2. Constriction area 3, 3a, 3b wide area 10 Topsheet 20 Back Seat 30 absorber 40, 41 Adhesive layer 50 Peel-off sheet 60 Three-dimensional gathers

Claims

1. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body disposed between the top sheet and the back sheet, an adhesive layer provided on the non-skin side of the back sheet, and a release sheet covering the adhesive layer, the backsheet is a breathable plastic film, The ratio of the area of the adhesive layer to the area of the back sheet is 20% or more and 45% or less, the ratio of the area of the adhesive layer to the area of the release sheet is 50% or more and 70% or less; The coating amount of adhesive for forming the adhesive layer is 20 g / m ２ 60g / m or more ２ An absorbent article characterized by the following:

2. The adhesive layer includes a linear adhesive layer having a linear shape, 2. The absorbent article according to claim 1, wherein a value obtained by dividing the perimeter of the linear adhesive layer by the area of the linear adhesive layer is 0.6 or less.

3. 2. The absorbent article according to claim 1, wherein the release sheet has a width of 45 mm or more and 75 mm or less.

4. The absorbent article according to claim 2, wherein the linear adhesive layer has a width dimension of 5 mm or more and 25 mm or less.

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