JP6311872B2 - Pants-type absorbent article - Google Patents

Description

  The present invention relates to a pants-type absorbent article.

  A pants-type absorbent article comprising a top sheet, a back sheet, an interior body including an absorbent body between the top sheet and the back sheet, and an exterior body positioned on the non-skin contact surface side of the interior body In general, gathers are often attached to parts around the user's stomach, legs, etc. so as to make fitting easier. For example, as shown in FIG. 6, these gathers are made by adhering a rubber thread of an elastic member between nonwoven fabrics constituting a pant-type absorbent article in an expanded state or a member having a rubber thread adhered between nonwoven fabrics. It can be formed by preparing and bonding it to a pants-type absorbent article. Thereby, the expansion and contraction performance of the pant-type absorbent article is improved, the feeling of fitting at the time of wearing is enhanced, and further, body fluid such as urine and blood is prevented from leaking to the outside.

  The presence of these gathers characterizes the appearance of a pants-type absorbent article such as a disposable diaper. That is, the rubber thread that can be seen through the gathered part, especially the part around the stomach and the buttock, and the large number of large wrinkles that form around it are very different from the appearance of normal underwear. ing. Such a difference in appearance is not desirable for users who do not want third parties to know the use of pant-type absorbent articles, and pants-type absorbent articles that are closer to underwear are expected.

  In order to improve such an appearance problem, a paper diaper has been proposed that uses an elastic film in place of the thread rubber in a so-called fit gather region formed in a region around the stomach. For example, Patent Document 1 discloses a breathable elastic film including a polymer selected from the group consisting of polyurethane, polyether amide, polyester elastomer, and combinations thereof, and can be stretched in two orthogonal directions bonded to the film. A technique for forming an absorbent article using a biaxial elastic stretchable breathable laminate comprising a nonwoven spunbond nonwoven web surface material is disclosed.

  However, the breathable laminate having the aesthetics for cloth disclosed in the above-mentioned Patent Document 1 needs to be used in a wide range of pant-type absorbent articles in order to apply the aesthetics to the region around the stomach. However, compared with the nonwoven fabric used with a normal pants-type absorbent article, there was a problem that air permeability was inferior and it was easy to get stuffy when worn.

JP 2008-279774 A

  The object of the present invention has been made in view of such problems, has an appearance closer to that of underwear, is easy to wear off, is easy to take off, has a good fit and feel when worn, and is stuffy when worn. An object of the present invention is to provide a pant-type absorbent article that is difficult and has excellent breathability.

The present invention is grasped by the following composition.
(1) The pant-type absorbent article of the present invention is a pant-type absorbent article, and includes a top sheet, a back sheet, and an interior body including an absorber between the top sheet and the back sheet, An exterior body that is located on the non-skin contact surface side of the interior body and is divided into an abdominal side part, a crotch part and a back side part, and the abdominal side part and the back side part include a plurality of nonwoven fabrics It is composed of a composite sheet integrated with a stretchable film between the nonwoven fabrics by heat fusion or ultrasonic bonding, and the stretchable film has a plurality of openings arranged in a staggered manner in a plan view, The opening has a short side of 0.1 mm or more and 0.3 mm or less with respect to the expansion / contraction direction and a long side of 0.3 mm or more and 0.7 mm or less with respect to a direction crossing the expansion / contraction direction, and is adjacent to the opening. The openings are 0.5 mm or more in the expansion / contraction direction. mm and less distance, and having a, 0.7 mm and less distance than 0.3mm in a direction intersecting the stretching direction.

(2) The pant-type absorbent article of the present invention is the pant-type absorbent article according to (1), wherein the composite sheet has a JIS L 1096 of 20 cm ³ / cm ² · sec or more in a non-stretched state. A (Fragile method): characterized by having an air permeability measured according to 1990.

(3) The pants-type absorbent article of the present invention is the pants-type absorbent article according to (1) or (2), wherein the composite sheet is 50 cm ³ / cm when stretched 150% in the stretch direction. JIS L 1096-A (Fragile method) of ² · sec or more: characterized by having an air permeability measured according to 1990.

(4) The pant-type absorbent article of the present invention is the pant-type absorbent article according to (1) to (3), wherein the stretchable film has a sub-opening having an area smaller than the opening. It is further provided with the feature.

(5) The pant-type absorbent article of the present invention is the pant-type absorbent article according to any one of (1) to (4), wherein the distance between the adjacent opening portions in the expansion / contraction direction intersects with the expansion / contraction direction. It is characterized by being larger than the distance in the direction.

  According to the present invention, there is provided an underpants-type absorbent article having an appearance close to that of underwear, easy to wear, easy to take off, good fit and feel at the time of wearing, and excellent breathability that is not easily stuffy at the time of wearing. can do.

It is the schematic which shows the underpants type absorbent article which concerns on embodiment of this invention. It is an expanded view of the underpants type absorbent article which concerns on embodiment of this invention. It is sectional drawing in the X-X 'line | wire of FIG. It is the top view to which the elastic film of FIG. 3 was expanded. It is the figure quoted in order to demonstrate the manufacturing method of the underpants type absorbent article which concerns on embodiment of this invention. It is the schematic which shows the conventional pants type absorbent article.

  With reference to FIG. 1 thru | or FIG. 5, the underpants type absorbent article which concerns on embodiment of this invention, and its manufacturing method are demonstrated in detail. In the description of the embodiments, the same numbers are assigned to the same elements throughout. In the description of the present specification, the longitudinal direction of the pant-type absorbent article 1 is a direction extending before and after the wearer when the pant-type absorbent article 1 is worn, and the short direction of the pant-type absorbent article 1 is Means a direction transverse or orthogonal to the longitudinal direction. Further, in the description of the present specification, the body fluid refers to a liquid discharged from the body such as urine, blood, and water in loose stool. Furthermore, when the pants-type absorbent article 1 is worn, it means at least one of when the pants-type absorbent article 1 is worn and after wearing. Moreover, although the paper diaper is demonstrated as an example as the pants-type absorbent article 1, other pants-type absorbent articles such as sanitary napkins and incontinence disposable diapers may be used.

  FIG. 1 is a schematic view showing a pant-type absorbent article according to an embodiment of the present invention, FIG. 2 is a development view of the pant-type absorbent article according to the embodiment of the present invention, and FIG. It is sectional drawing in the XX 'line of 2. FIG. One embodiment of the pant-type absorbent article 1 in the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the pant-type absorbent article 1 includes a top sheet 21, a back sheet 22, an interior body 20 including an absorber 23 between the top sheet 21 and the back sheet 22, and an interior And an exterior body 10 that is positioned on the non-skin contact surface side of the body 20 and is divided into an abdominal side part 11, a crotch part 13, and a back side part 12.

(Interior body)
The interior body 20 of the present embodiment is disposed on the skin contact surface side, a liquid-permeable top sheet 21, a liquid-impermeable back sheet 22 disposed to face the top sheet 21, and the top sheet 21. And an interior body 20 including a three-dimensional gather 24. Thereby, the absorber 23 has a structure sandwiched between the top sheet 21 and the back sheet 22. The interior body 20 is disposed from the abdomen side portion to the inside of the back side portion of the exterior body 10, and is adhered to the exterior body 10 by an adhesive such as hot melt, thermal fusion, ultrasonic bonding, or the like. .

The base material of the top sheet 21 of the present embodiment only needs to have liquid permeability so that the body fluid moves to the absorber 23. For example, a nonwoven fabric such as a thermal bond nonwoven fabric or a thermal bond / spun bond is laminated. It is formed from a material such as a composite nonwoven fabric, an open film such as an open polyethylene film, a foam film such as polyethylene foam or urethane foam, or a composite sheet obtained by laminating these films. The top sheet 21 is preferably embossed or perforated on the surface in order to improve liquid permeability. The processing method can perform a well-known method without a restriction | limiting. In order to reduce irritation to the skin, the top sheet 21 preferably contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like. Furthermore, the strength and processability of the point, the basis weight of the top sheet 21 is preferably 14 g / ^{m 2} or more 40 g / ^{m 2} or less. Although there is no restriction | limiting in particular as a shape of the top sheet 21, In order to guide liquids, such as urine, to the absorber 23, what is necessary is just the shape which covers the absorber 23. FIG.

  In addition, it is preferable to provide the three-dimensional gather 24 which prevents the leakage of body fluid from the skin contact surface side of the top sheet 21 from both longitudinal edges, that is, from the longitudinal front part A to the longitudinal rear part B. The outer part in the width direction of the three-dimensional gather 24 is fixed to the back sheet 22, and the inner part in the width direction is not fixed to the top sheet 21, and the three-dimensional gather elastic member 24 a such as thread rubber and the nonwoven fabric along the longitudinal direction. By being formed of the sheet 24b, etc., it has an upright property and can be deformed so as to expand and contract in accordance with the body shape of the user.

  The base material of the back sheet 22 of the present embodiment may be any material as long as it has liquid impermeability so that the body fluid retained by the absorber 23 does not leak, and may be a nonwoven fabric, a resin film, or a composite in which these are laminated. It is formed from a material such as a sheet. The production method of the nonwoven fabric is not particularly limited. For example, a spunbond or meltblown nonwoven fabric, or a composite nonwoven fabric obtained by laminating spunbond / meltblown or spunbond / meltblown / spunbond, or a composite material thereof can be considered. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable that the back seat | sheet 22 has moisture permeability. In order to provide moisture permeability, for example, a filler is added to the resin film of the base material, and the back sheet 22 is embossed for perforation.

  The base material of the absorbent body 23 of the present embodiment is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine pads. For example, fluff pulp, superabsorbent resin (Super) Absorbent Polymer (hereinafter referred to as “SAP”), and a hydrophilic sheet. Examples of fluff pulp include those obtained by defibrating non-wood pulp such as wood pulp, synthetic fiber, and polymer fiber into a cotton shape. Examples of the highly water-absorbing resin include sodium polyacrylate, and examples of the hydrophilic sheet include tissue, absorbent paper, and hydrophilic nonwoven fabric.

  The absorber 23 is configured as a single layer or a multilayer sheet using the above-described base material. Among these, those formed by mixing a hydrophilic fiber matrix of a fluff pulp web, such as a wood pulp fluff, with SAP particles are preferable. Further, in order to prevent leakage of SAP particles and stabilize the shape of the absorber 23, it is preferable to wrap the absorber 23 in a hydrophilic sheet (not shown) such as tissue. Further, it is preferable to emboss the surface of the absorbent body 23 because the diffusion of the body fluid is controlled and the absorbent body 23 is easily deformed according to the body shape of the user.

(Exterior body)
The pant-type absorbent article 1 is located on the non-skin contact surface side of the interior body 20 described above, and is located on the stomach side (A side in FIG. 2) of the wearer, and on the back side (in FIG. 2). The exterior body 10 is divided into a back side portion 12 positioned on the B side) and a crotch portion 13 positioned therebetween.

  The ventral side portion 11 and the back side portion 12 are composed of a composite sheet in which a plurality of nonwoven fabrics 14 and a stretchable film 15 are integrated between the nonwoven fabrics 14 by heat fusion or ultrasonic bonding. The crotch part 13 may be composed of a composite sheet similar to the ventral part 11 and the dorsal part 12, using the same material as the nonwoven fabric described above, and using the same processing method. You can also.

  The nonwoven fabric 14 which comprises the composite sheet of this embodiment can use the thing by the same method for the processing method using the raw material similar to the nonwoven fabric mentioned above. The stretchable film 15 is not particularly limited as long as it has stretchability, and examples thereof include films formed from polyester elastomers, polyolefin elastomers, polyurethane resins, polyamide resins, and the like. Among these, a polyurethane resin film is preferable from the viewpoint of cost and stretchability.

The composite sheet has an air permeability measured in accordance with JIS L 1096-A (Fragile method): 1990 of 20 cm ³ / cm ² · sec or more in a non-stretched state. If the air permeability is less than 20 cm ³ / cm ² · sec, it becomes easy to get stuffy when worn. The air permeability can be freely changed according to the thickness of fibers and yarns of the nonwoven fabric constituting the composite sheet, the weave density, the weight per unit area, the opening area ratio of the opening provided in the stretchable sheet, and the like.

Further, the composite sheet has an air permeability measured based on JIS L 1096-A (Fragile method): 1990 of 50 cm ³ / cm ² · sec or more when stretched 150% in the stretching direction. Here, 150% extending in the expansion / contraction direction is the ratio of the length of the stretched and increased length to the natural length in the non-stretched state. That is, when a composite sheet having a natural length of 10 cm in a non-stretched state is stretched by 15 cm in the stretching direction, it is stretched by 15/10 × 100 = 150%. When the air permeability is less than 50 cm ³ / cm ² · sec, the portion used in the stretched state, for example, the portion around the buttocks is easily stuffy when worn.

  The pants-type absorbent article 1 can be provided with a pair of left and right leg gathers 16 extending from the abdominal side portion 11 to the back side portion 12 through the crotch portion 13. The leg gathers 16 are formed by an elastic member 16a, for example, a sheet 16b made of rubber thread and nonwoven fabric. By providing the leg gather 16, not only the expansion / contraction direction (left / right direction when worn) but also the direction intersecting with the expansion / contraction direction (vertical direction when worn) can be expanded / contracted, so that the fit around the inseam is improved. improves.

  FIG. 4 is an enlarged plan view of the stretchable film 15 of the present invention. As shown to Fig.4 (a), the elastic film 15 is provided with the several opening part arrange | positioned in zigzag form in planar view. The opening is formed by a general known manufacturing method, and has a short side A of 0.1 mm or more and 0.3 mm or less with respect to the expansion / contraction direction and a direction of 0.3 mm or more and 0.7 mm or less with respect to the direction intersecting the expansion / contraction direction. The long sides B and adjacent openings are a distance D of 0.5 mm or more and 1.0 mm or less in the expansion / contraction direction and a distance C of 0.3 mm or more and 0.7 mm or less in the direction intersecting the expansion / contraction direction. It is preferable. By forming the openings at a predetermined size and interval, the air permeability of the exterior body 10 of the pant-type absorbent article 1 is improved, and the deterioration in durability due to the opening of the stretchable film 15 is alleviated. . Further, from the viewpoint of achieving both contraction force and air permeability, it is preferable that the distance D in the expansion / contraction direction between adjacent openings is greater than the distance C in the direction intersecting the expansion / contraction direction. In this description, the opening has a rectangular shape, but the shape is not particularly limited as long as it is within the set range, and may be, for example, an ellipse or a rhombus.

  As shown in FIG. 4B, the stretchable film 15 may further include a sub-opening having an area smaller than the opening. The sub-opening has a short side E of 0.01 mm or more and 0.2 mm or less with respect to the expansion / contraction direction and a long side F of 0.01 mm or more and 0.2 mm or less with respect to the direction intersecting the expansion / contraction direction. It is preferable that the sub-openings have a distance G of 0.6 mm or more and 1.3 mm or less in the expansion / contraction direction and a distance H of 0.6 mm or more and 1.4 mm or less in a direction crossing the expansion / contraction direction. Further, the distance G in the expansion / contraction direction between the adjacent sub-openings is preferably larger than the distance H in the direction intersecting with the expansion / contraction direction, like the opening. By providing this sub-opening, the air permeability of the stretchable film 15 increases. For this reason, compared with the thing which does not provide the subopening part, it becomes difficult to sag by the time of wearing of the underpants type absorbent article 1. In the present description, the sub-opening has a circular shape, but the shape is not particularly limited as long as it is within the set range, and may be, for example, a square or a rhombus.

  The composite sheet preferably has an opening area ratio of 7% or more and 14% or less including the opening and the sub-opening. Here, the opening area ratio is the ratio of the area of the opening per unit area. For example, the opening area ratio (%) = (A × B) / (( B + C) × (A + D)). When the opening area ratio is less than 7%, the air permeability is inferior. On the other hand, when the opening area ratio exceeds 14%, the strength is lowered, which is not preferable.

  Next, with reference to FIG. 5, the manufacturing method of the composite sheet used for the underpants type absorbent article which concerns on embodiment of this invention is demonstrated. Here, a method for producing a composite sheet while conveying a continuous body of constituent members of the composite sheet in the longitudinal direction will be described.

  As shown in FIG. 5A, as the first step, the stretchable film 15 is fed from the rotating roller 51 and stretched up and down by applying a predetermined tension to the stretchable film 15. The predetermined tension refers to a state in which the stretchable film 15 is stretched by 200% or more, more preferably 250 ± 30%. And in a 2nd process, the nonwoven fabric 14 supplied from the rotating roller 52 is laminated | stacked on the upper and lower sides of the stretchable film 15 of the expanded state. Next, in the third step, a seal line that is substantially continuous in the longitudinal direction perpendicular to the stretching direction of the laminated stretchable film 15 and nonwoven fabric 14 is 0.5 mm to 2.0 mm with respect to the stretching direction. The composite sheet is formed by bonding by heat fusion or ultrasonic bonding over the entire region at intervals, and bonding the stretchable film 15 and the nonwoven fabric 14. Specifically, as shown in FIG. 5B, the laminated stretchable film 15 and the nonwoven fabric 14 are narrowed by the joining roller 53 and the other joining roller 54, and the end 55 at the tip of the joining roller 53 and the other The contact line with the side surface 56 of the joining roller 54 is formed by heat fusion or ultrasonic bonding to form a seal line. Thus, by forming the seal lines at a predetermined interval and integrating the nonwoven fabric 14 and the stretchable film 15, wrinkles on the surface of the exterior body 10 are alleviated and a smooth touch is achieved.

  The composite sheet has an arithmetic average roughness Ra of 600 μm or more and 1200 μm or less, a maximum cross-sectional height Rt of a roughness curve of 60 μm or more and 250 μm or less, and 600 μm or more on at least the non-skin contact surface side of the ventral part 11. , And an average length RSm of roughness curve elements of 8500 μm or less. The composite sheet has an arithmetic average roughness Ra of 400 μm or more and 1000 μm or less and a maximum cross-sectional height Rt of a roughness curve of 50 μm or more and 200 μm or less when stretched 150% in the expansion / contraction direction. Arithmetic average roughness Ra is based on JIS B 0601 (2001), and by making it into the above range, the surface does not become too flat, the surface is smooth, and the design is good. Moreover, the maximum cross-sectional height Rt of the roughness curve is based on JIS B 0601 (2001), and by setting the above range, the surface has an appropriate frictional force. Furthermore, the average length RSm of the roughness curve element is based on JIS B 0601 (2001), and by making it within the above range, a high-quality touch can be obtained. Therefore, the surface of the pants-type absorbent article 1 can have an appearance closer to that of underwear. When the pants-type absorbent article 1 is detached, the arithmetic average roughness Ra and the maximum cross-sectional height Rt of the roughness curve are set within the above ranges when stretched 150% in the stretching direction. Goodness can be given. The arithmetic average roughness Ra, the maximum cross-sectional height Rt of the roughness curve, and the average length RSm of the roughness curve element are, for example, a one-shot 3D measurement macroscope (trade name: VR-3100) manufactured by KEYENCE Inc. Can be measured.

  The composite sheet has an extension load of 0.8 N / 50 mm or more and 2.0 N / 50 mm or less when extended 120% in the expansion / contraction direction, and 2.0 N / 50 mm when extended 150% in the expansion / contraction direction. The tensile load is 3.5 N / 50 mm or less. In addition, since the elongation rate changes depending on the wearer's body shape, 120% and 150% elongation loads were defined. By doing in this way, a difference in fit does not occur depending on the body shape. The composite sheet preferably has an elongation of 30% or less when a load of 3.0 N / 50 mm is applied in a direction intersecting the expansion and contraction direction. By doing in this way, since it does not expand | extend in directions other than an arrangement | positioning direction, it becomes easy to attach or detach the underpants type absorbent article 1. FIG. Further, the composite sheet has an elongation percentage in the expansion / contraction direction of 200% or more and 270% or less. For this reason, since expansion | swelling of 200% or more was attained compared with the past, the pants type absorbent article 1 which is easy to wear and can take off easily for a wearer can be provided. Here, the elongation rate in the expansion / contraction direction is the ratio of the length of the stretched and increased length to the natural length in the non-stretched state, as in the case of 120% expansion in the expansion / contraction direction. The extension load can be measured using, for example, an autograph manufactured by Shimadzu Corporation.

  The composite sheet preferably has a breaking elongation of 210% or more and 280% or less in the stretching direction. Here, the breaking elongation refers to the composite sheet in a specific direction (stretching direction) when the original length of the composite sheet in the non-stretchable natural length is L1, and the length when stretched is L2. Is the elongation ratio (L2 / L1 × 100) when the is stretched and broken. By having the breaking elongation in this range, there is an effect that it becomes difficult to be stretched or torn even if the pants are widened greatly when attaching and detaching. The breaking elongation can be measured using, for example, an autograph manufactured by Shimadzu Corporation.

  The following examples further illustrate the present invention. In addition, this invention is not limited to description of a following example, unless the summary is exceeded.

A disposable diaper was used as the pant-type absorbent article. Air-through nonwoven 30 g / m ² as a topsheet, using a breathable polyethylene film 32 g / m ² as a backsheet, between the topsheet and the backsheet, fluff pulp 12g, water-absorbing polymers consisting of polyacrylic acid resin An absorber made of 11 g of a mixture was arranged to make an interior body. Two pieces of 940 dtex urethane thread rubber extending in the longitudinal direction on both sides of the short side of the interior body, each extending to 200%, were arranged to form an underbody gather. A 20 μm thick urethane film having an opening ratio of 11.4% is laminated between two layers of 20 g / m ² polypropylene spunbonded nonwoven fabric in a stretched state of 250% and extends linearly in a direction perpendicular to the stretching direction. A laminated body (composite sheet) having stretchability and air permeability was formed by ultrasonic bonding over the entire area with a pattern to obtain an exterior body. At the waistline end of the outer package, a composite of 17 g / m ² polypropylene spunbond and 1240 dtex urethane thread rubber stretched 200% was placed to form a waistline gather.

  In Examples 2 and 3 and Comparative Examples 1, 2 and 3, the configuration was the same as Example 1 except that the opening ratio and opening pattern of the stretchable film were as shown in Table 1.

[Evaluation method]
1. Breathability The breathability of the composite sheet when stretched 150% in the non-stretched state and in the stretch direction was measured based on JIS L 1096-A (Fragile method): 1990. The results are shown in Table 1.

2. Sensory evaluation A sensory evaluation was performed on the durability and breathability of the pants-type absorbent article for 20 panelists of 20 women. In this evaluation, for the pant-type absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3, (i) difficulty in breaking in the stretching direction, (ii) difficulty in breaking in the direction intersecting with the stretching direction, ( The sensory test which selects either (a) good, (b) not so good, and (c) bad about three items of iii) difficulty of stuffiness was done. When the evaluation of (a) is 14 to 20 people, “◯”, when the evaluation of (a) is 8 to 13 people, “△”, and when (a) is 0 to 7 people, “X” It was. The results are shown in Table 1.

  As a result, as shown in Table 1, with respect to the pant-type absorbent article 1 according to the present example, the opening intersects with the short side of 0.1 mm to 0.3 mm with respect to the expansion / contraction direction and the expansion / contraction direction. It has been found that a long side of 0.3 mm or more and 0.7 mm or less is suitable for the direction. Also, the adjacent openings are preferably a distance of 0.5 mm to 1.0 mm in the expansion / contraction direction and a distance of 0.3 mm to 0.7 mm in the direction intersecting the expansion / contraction direction. It has been found that the air permeability of the outer package 10 of the article 1 is improved and the decrease in durability due to the opening of the stretchable film 15 is alleviated.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment and embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiment. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Pants type absorbent article 10 Exterior body 11 Abdomen side part 12 Back side part 13 Crotch part 14 Nonwoven fabric 15 Elastic film 16 Leg gather 20 Interior body 21 Top sheet 22 Back sheet 23 Absorber 24 Three-dimensional gather

Claims (5)

A pants-type absorbent article,
A top sheet, a back sheet, and an interior body including an absorber between the top sheet and the back sheet;
An exterior body that is located on the non-skin contact surface side of the interior body and is divided into an abdominal side part, a crotch part, and a back side part,
The ventral part and the dorsal part are composed of a composite sheet in which a plurality of nonwoven fabrics and a stretchable film are integrated between the nonwoven fabrics by heat fusion or ultrasonic bonding,
The stretchable film includes a plurality of openings arranged in a staggered pattern in plan view,
The opening is
A short side of 0.1 mm to 0.3 mm with respect to the stretching direction, and a long side of 0.3 mm to 0.7 mm with respect to the direction intersecting the stretching direction,
The adjacent openings are
A distance of 0.5 mm to 1.0 mm in the stretching direction;
A pant-type absorbent article having a distance of 0.3 mm or more and 0.7 mm or less in a direction crossing the expansion / contraction direction. 2. The composite sheet according to claim 1, wherein the composite sheet has an air permeability measured based on JIS L 1096-A (Fragile method): 1990 of 20 cm ³ / cm ² · sec or more in a non-stretched state. Pants-type absorbent article. The composite sheet, when stretched 150 percent in the expansion and contraction direction, (5 ^0cm 3 / ^{cm 2} or more, seconds JIS L 1096-A (Frazier method): characterized in that it has a permeability which is measured on the basis of 1990 The underpants-type absorbent article according to claim 1 or 2.


  The pants-type absorbent article according to any one of claims 1 to 3, wherein the stretchable film further includes a sub-opening having an area smaller than the opening.   The pants-type absorbent article according to any one of claims 1 to 4, wherein a distance in an expansion / contraction direction between adjacent openings is larger than a distance in a direction intersecting the expansion / contraction direction.

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