JP6444818B2 - Disposable wearing items - Google Patents

Description

  The present invention relates to disposable wearing articles such as diapers.

  Patent Document 1 includes a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, an outer layer sheet located on the non-skin facing surface side, and an elastic layer located on the skin facing surface side. A disposable wearing article is disclosed.

JP2010-2000974 (P2010-200794A)

  In the wearing article disclosed in Patent Document 1, the outer layer sheet is joined to the elastic layer at a plurality of joints extending in the longitudinal direction of the diaper, and is curved to the outer surface at a non-joint part located between the joints. A part (non-joined part) is formed. The inside of the diaper and the outside communicate with each other by forming a vent opening that penetrates the collar part of the outer layer sheet and the liquid-permeable inner layer sheet facing the collar part, thereby suppressing the stuffiness inside the diaper. Has been.

  However, in such a wearing article, since the ventilation opening is formed in the inner layer sheet that directly contacts the wearer's skin, there is a possibility that excrement may leak out from the ventilation opening. Further, since the ventilation opening penetrates the opening of the inner layer sheet and the opening of the outer layer sheet so as to overlap each other in plan view, the sheet strength of the portion where the ventilation opening is formed is locally lowered, and the diaper is pulled up. Occasionally, there is a risk of breakage starting from this portion. Furthermore, when the ventilation opening is formed by hot embossing, a part of the opening edge is welded, and the welded part may directly touch the skin and cause irritation.

  The present invention is an improvement of a conventional disposable wearing article, wherein a plurality of openings increase the breathability inside the diaper without impairing the feeling of wearing, and the disposable wearing article does not allow excrement to leak out from the opening. Is a challenge.

  In order to solve the above-mentioned problems, the present invention has a longitudinal direction and a transverse direction intersecting therewith, a skin facing surface and a non-skin facing surface, a first waist region which is one of front and back waist regions, and the front and back The present invention relates to a disposable wearing article including a second waist area which is the other of the waist areas, a crotch area located between the first and second waist areas, a waist opening and a pair of leg openings.

  In the wearing article, at least a first waist region of the first and second waist regions includes an outer layer sheet positioned on the non-skin facing surface side and an elastic layer positioned on the skin facing surface side. The outer layer sheet has a plurality of joint portions extending in the longitudinal direction and a plurality of non-joint portions positioned between the joint portions, and is joined to the elastic layer at the joint portion, and the elastic layer Are an intermediate sheet positioned on the non-skin facing surface side, a moisture permeable inner layer sheet positioned on the skin facing surface side, and an elastic member extending in the lateral direction interposed between the intermediate sheet and the inner layer sheet. And at least one of the outer layer sheet and the intermediate sheet has a plurality of openings that are spaced apart from each other in the longitudinal direction and the lateral direction, and the opening is formed in the inner layer sheet. Not And features.

  Since the outer layer sheet and the intermediate sheet are welded in the joint portion, the outer layer sheet and the intermediate sheet are welded, so that the joint strength is higher than that in the case of being joined by an adhesive. Become.

  The plurality of openings include a first opening located in the outer sheet and a second opening located in the intermediate sheet, and the first opening and the second opening do not overlap each other in plan view. In such a wearing article, since the first opening located in the outer layer sheet and the second opening located in the intermediate sheet have no overlap with each other in plan view, the sheet strength is not locally reduced, It is possible to suppress sheet tearing starting from the portion.

  The inner layer sheet, the intermediate sheet and the outer layer sheet are formed from a fiber nonwoven fabric sheet, and the mass per unit area of the inner layer sheet is more than the mass per unit area of the intermediate sheet and the outer layer sheet. Is also small. In such a wearing article, the inner layer sheet, the intermediate sheet, and the outer layer sheet are formed from a fiber nonwoven fabric sheet, and the mass per unit area of the inner layer sheet is more than the mass per unit area of the outer layer sheet and the intermediate sheet. Since it is small, an inner layer sheet has moisture permeability of the grade which can permeate the air inside a diaper.

  Since the plurality of openings are not disposed at the inner end portions of the first and second waist regions, the plurality of openings are disposed at the inner end portions of the first and second waist regions. Therefore, there is no possibility that the sheet strength of the inner end portion is reduced and the tear of the inner end portion is caused by the movement of the wearer's thigh.

  A waist panel that defines the first and second waist regions; and an absorbent panel that extends from the crotch region to the first and second waist regions, wherein the plurality of openings include the first and second openings. In one waist area of a waist area, it arrange | positions on the said outer side of the said absorption panel. In such a worn article, skin troubles caused by stuffiness inside the diaper 10 can be avoided by arranging a plurality of openings on the outer side in the longitudinal direction of the absorbent panel in one waist region.

  Each of the plurality of openings has a dot shape and has a diameter of about 0.5 to 2.5 mm, the vertical separation of about 5.0 to 20.0 mm, and the lateral separation of about 5.0-20.0 mm.

  According to the disposable wearing article according to the present invention, in at least one waist region, a plurality of openings are formed in the outer layer sheet and the intermediate sheet, and the inner layer sheet has moisture permeability. It is possible to prevent stuffiness inside the diaper. Moreover, since a plurality of openings are not formed in the inner layer sheet, it is possible to prevent excrement from leaking from the inside of the diaper.

The drawings illustrate specific embodiments of the invention and include selective and preferred embodiments as well as the essential features of the invention.
The perspective view which looked at the disposable wearing article concerning the present invention from the front. The partial fracture | rupture expansion | deployment top view of the absorbent article extended in the vertical direction and the width direction until the time of the maximum expansion | extension of each elastic body (the extent which the gathers by the contraction effect | action of an elastic material disappear) seen from the outer surface side. An exploded view of the front waist panel. (A) Sectional drawing which follows the IV (a) line of FIG. 2, (b) Sectional drawing which follows the IV (b) line of FIG. The elements on larger scale of the area | region enclosed with the V line | wire of Fig.4 (a). FIG. 3 is a partially enlarged view of a region surrounded by a VI line in FIG. 1. The expansion | deployment top view similar to FIG. 2 of the diaper in an example of a modification.

  The following embodiment relates to the disposable wearing article shown in FIGS. 1 to 7 and includes not only an indispensable structure of the invention but also a selective and preferable structure.

  1 to 3, a disposable diaper 10 shown as an example of a disposable pants-type wearing article of the present invention includes a skin facing surface, a non-skin facing surface facing the skin, a longitudinal direction Y, a lateral direction X, and a thickness. An annular elastic waist panel 11 extending in the direction around the waist, an absorbent panel 12 joined to the elastic waist panel 11, a front waist region (first or second waist region) 13, A rear waist region (first or second waist region) 14 and a crotch region 15 positioned between the front and rear waist regions 13 and 14 are included. The diaper 10 further has a vertical center line P that bisects the dimension in the horizontal direction X and a horizontal center line Q that bisects the dimension in the vertical direction Y. The elastic waist panel 11 includes a front waist panel 16 that forms the front waist region 13 and a rear waist panel 17 that forms the rear waist region 14.

  The front and rear waist panels 16 and 17 respectively have inner end edges 16a and 17a extending in the horizontal direction X, and outer end edges 16b and 17b extending in the horizontal direction X while being spaced apart from the inner end edges 16a and 17a in the vertical direction Y. In addition, it has an oblong rectangular shape of the same shape and size defined by both side edges 16c, 16d, 17c, 17d extending in the longitudinal direction Y between the inner and outer end edges 16a, 16b, 17a, 17b. The inner and outer end edges 16a, 16b, 17a and 17b and the side edges 16c, 16d, 17c and 17d of the front and rear waist panels correspond to the inner and outer end edges and both side edges of the front and rear waist regions 13 and 14, respectively.

  Each of the side edge portions of the front waist panel 16 (both side edge portions of the front waist region 13) and the side edge portions of the rear waist panel 17 (both side edges of the rear waist region 14) are overlapped with each other in the longitudinal direction Y. A waist seam 24 and a pair of leg openings 25 are defined. The side seam 23 is made by a well-known joining means, for example, various heat welding means such as a heat welding process and an ultrasonic welding process.

  Referring to FIG. 2, the front and rear waist regions 13 and 14 are respectively provided with inner end portions 13A and 14A located on the leg opening 25 side and outer end portions 13B and 14B located on the waist opening 24 side for convenience of explanation. Center portions 13C and 14C are located between the inner end portions 13A and 14A and the outer end portions 13B and 14B. The inner and outer end portions 13A, 13B, 14A, 14B are about 10 to 30% of the longitudinal dimension Y (the length of the side edge portion) L1 of the front and rear waist regions 13, 14, and the center portion 13C. , 14C has a size of about 40 to 80% of the dimension in the longitudinal direction Y of the front and rear waist regions 13,14.

  The front and rear waist regions 13 and 14 (front and rear waist panels 16 and 17) each have a non-stretchable outer layer sheet 30 positioned on the non-skin facing surface side and an elastic layer 31 positioned on the skin facing surface side. . The elastic layer 31 includes a plurality of strips interposed between the intermediate sheet 32 positioned on the non-skin facing surface side, the moisture-permeable inner layer sheet 33 positioned on the skin facing surface side, and the intermediate sheet 32 and the inner layer sheet 33. And the front and rear waist elastic bodies 35 and 36 in the form of strands or strings. The front and rear waist elastic bodies 35 and 36 are interposed between the intermediate sheet 32 and the inner layer sheet 33 that form the front and rear waist regions 13 and 14, respectively, and are attached so as to be contractible in a state of being stretched in the lateral direction X. Yes. The front and rear waist regions 13 and 14 have front and rear elastic regions that can be expanded and contracted in the lateral direction X by arranging the front and rear waist elastic bodies 35 and 36, respectively.

  In the present embodiment, the intermediate sheet 32 and the inner layer sheet 33 are joined to each other by a hot melt adhesive applied to the entire circumference of the front and rear waist elastic bodies 35 and 36 interposed therebetween. The two sheets 32 and 33 may be joined to each other via a hot melt adhesive applied to the entire inner surface in various known patterns such as a dot shape or a spiral shape. By joining only with the hot-melt adhesive applied to the entire circumference of the bodies 35 and 36, the elastic layer 31 becomes relatively soft and the wearer's skin contact becomes good.

  The outer layer sheet 30 and the intermediate sheet 32 are inelastic stretchable and can be formed from various known fiber nonwoven fabrics including thermoplastic synthetic fibers, or composite sheets obtained by laminating them with a plastic film. The inner layer sheet 33 can be formed from various known fiber nonwoven fabrics that are inelastic stretchable and have moisture permeability (preferably, air permeability). As the thermoplastic synthetic fiber, for example, synthetic fibers such as polyethylene, polypropylene, polyethylene terephthalate, a mixture of synthetic fibers, or composite fibers using two or more kinds of these synthetic resins can be used. Moreover, as a fiber nonwoven fabric, various well-known fiber nonwoven fabrics, such as a spun bond fiber nonwoven fabric, an SMS fiber nonwoven fabric, and an air through fiber nonwoven fabric, can be used. In addition, as will be described later, the outer layer sheet 30 and the intermediate sheet 32 are porous sheets having a plurality of openings 61 and 62, and in that sense, have air permeability.

  As the front and rear waist elastic bodies 35 and 36, for example, a string-like or strand-like elastic material having a thickness of about 300 to 500 dtex and stretched and fixed 1.5 to 3.5 times can be used. Moreover, the thickness and expansion ratio of the front and rear waist elastic bodies 35 and 36 can be appropriately changed according to a predetermined elastic force in an elastic region in which they are arranged. Although not shown, the contraction force of the front and rear waist elastic bodies 35 and 36 is substantially in the presence area of the absorbent core located in the center of the front and rear waist regions 13 and 14 and within the absorbent panel 12. You may arrange | position the non-elastic region which is not expressed or the both elastic bodies 35 and 36 do not exist. By disposing the non-elastic region in the region where the absorbent cores of the front and rear waist regions 13 and 14 are present, the contraction force of the elastic bodies 35 and 36 directly acts on the absorbent core, thereby reducing the absorbency. Can be suppressed.

  The outer layer sheet 30 and the intermediate sheet 32 are joined to each other via a plurality of joining lines (joining portions) 41 and 42 that continuously extend in the longitudinal direction Y and are separated from each other in the transverse direction X. The joining lines 41 and 42 include a first joining line 41 that joins the outer layer sheet 30 and the elastic layer 31 to each other at the outer end portions 13B and 14B and the center portions 13C and 14C of the front and rear waist regions 13 and 14, and the inner end portion 13A. , 14 </ b> A has a second joining line 42 that joins the outer layer sheet 30 and the elastic layer 31. The first and second joining lines 41 and 42 are welding lines for joining the outer layer sheet 30 and the intermediate sheet 32 by heat welding means such as heat welding processing and ultrasonic processing, and in the illustrated example, in the longitudinal direction Y. Although it is a stripe shape extending continuously in a straight shape, it may be an intermittent one formed by arranging a plurality of dot-like welded portions in the vertical direction Y. In the following description based on FIGS. 3 to 6, the configuration of the front waist region 13 (front waist panel 16) will be mainly described, but the rear waist region 14 (rear waist panel 17) has the same configuration. Therefore, the description is omitted.

  Referring to FIGS. 3 and 4A, 4B, the first joining line 41 has a length dimension larger than that of the second joining line 42 and is wider, and the length of the first joining line 41 is longer. The length dimension (dimension in the vertical direction Y) L2 is about 120 to 220 mm, and the width dimension (dimension in the horizontal direction X) W1 is about 0.5 to 2.0 mm. Moreover, the length dimension L3 of the 2nd joining line 42 is about 30-80 mm, and a width dimension is 0.3-1.0 mm. Further, the separation dimension (pitch) R1 between the first joint lines 41 adjacent to each other in the lateral direction X is about 5.0 to 20.0 mm, and the separation dimension (second dimension between the second joint lines 42 adjacent to each other in the lateral direction X ( (Pitch) R2 is about 3.0 to 10.0 mm. Here, the “separation dimensions R1, R2 of the first and second joining lines 41, 42” mean the spacing dimensions between the side edges of the joining lines adjacent to each other in the lateral direction X.

  Although not shown in the drawings, it is visually recognized from the outside between the outer sheet 30 and the intermediate sheet 32 or between the intermediate sheet 32 and the inner sheet 33 in the central portions 13C and 14C of the front and rear waist regions 13 and 14. A graphic sheet with possible graphics may be placed. Further, the dimension of the outer layer sheet 30 in the longitudinal direction Y is formed larger than that of the inner layer sheet 33 and the intermediate sheet 32, and the portion extending from the outer edge of the sheets 32, 33 to the outside in the longitudinal direction Y is inside ( It may be bent to the skin facing surface side) and fixed to the skin facing surface side of the inner layer sheet 33. Further, the rear waist panel 17 may have a trapezoidal shape having a larger outer dimension than the front waist panel 16, and a collar cover portion that extends further inward in the vertical direction Y from the side seam 23 may be formed.

  Referring to FIGS. 1, 4 (a), and 4 (b), the outer layer sheet 30 has a collar portion (non-joined portion) 45 positioned between the first joining lines 41. The outer layer sheet 30 is joined to the elastic layer 31 that expands and contracts in the lateral direction X at a plurality of first joining lines 41 that extend in the longitudinal direction Y and that are separated in the transverse direction X, and between the first joining lines 41. , The lateral dimension X of the elastic layer 31 is smaller than the lateral dimension X of the outer layer sheet 30, so that the flange 45 positioned between the first joining lines 41 is curved outward in the thickness direction Z. Has a shape. In the outer layer sheet 30, the ridges 45 and the groove portions where the first joining lines 41 are positioned alternately in the lateral direction X, and the undulations 45 are repeated in the lateral direction by connecting the ridge portions 45 and the groove portions in the lateral direction X. Has a shape. The flange portion 45 is formed at the outer end portions 13B and 14B and the central portions 13C and 14C of the front and rear waist regions 13 and 14 where the front and rear waist elastic bodies 35 and 36 are located. Since the outer layer sheet 30 is divided relatively small in the lateral direction X by the first joining line 41, a plurality of irregularities (a plurality of gathers) are not formed in the collar portion 45, and a continuous convex curve is formed as a whole. One convex curve portion is formed.

  On the other hand, on the inner end portions 13A and 14A of the front and rear waist regions 13 and 14, ridges that are convex outward in the thickness direction Z extending in the longitudinal direction are formed by contraction of the elastic layer 31 between the second joining lines 42. Is done. Since the separation dimension R2 between the second joining lines 42 is smaller than the separation dimension R1 between the first joining lines 41, the flanges located between the second joining lines 42 are located between the first joining lines 41. The height (dimension in the thickness direction Z) is smaller than the portion 45. In the present embodiment, the intermediate sheet 32 is disposed over the entire front and rear waist regions 13 and 14, but is disposed only in the outer end portions 13B and 14B and the central portions 13C and 14C, and on the inner end portions 13A and 14A. May not be arranged.

  The intermediate sheet 32 and the inner layer sheet 33 are formed with a plurality of relatively small gathers 46 and 47 that repeatedly undulate in the lateral direction X by contraction of the front and rear waist elastic bodies 35 and 36. The flange portion 45 and the intermediate sheet 32 of the outer layer sheet 30 are separated from each other in the thickness direction Z, and a tubular or cylindrical air passage 50 extending in the longitudinal direction Y is formed therebetween.

  As long as the air passage 50 is formed, the elastic layer 31 is composed only of the front and rear waist elastic bodies 35 and 36 and the inner layer sheet 33 and may not have the intermediate sheet 32. However, since the front and rear waist elastic bodies 35 and 36 are covered with a plurality of sheets of the outer layer sheet 30 and the intermediate sheet 32, the outer shape is not clearly grasped from the outside. Moreover, since the collar part 45 of the outer layer sheet 30 is spaced apart from the elastic layer 31 and protrudes outward in the thickness direction Z, the light traveling from the outside toward the diaper 10 is scattered on the outer surface of the diaper 10, and the front and rear waist elasticity The visibility of the bodies 35 and 36 is further reduced. Accordingly, the diaper 10 has an underwear-like appearance as compared with the case where the front and rear waist elastic bodies 35 and 36 are clearly visually recognized, and can give the wearer a soft and soft impression. it can.

  It is preferable that the flange 45 extends substantially straight in the longitudinal direction Y without being deformed or meandering so that air can be stably moved in the air passage 50 of the outer layer sheet 30. Thus, in order for the collar part 45 to have a stable shape, the mass (in some cases, the density and specific volume) of the outer layer sheet 30, the width dimension W <b> 1 of the first joining line 41, and the distance between the first joining lines 41. It is preferable to appropriately adjust the separation dimension R1 in the lateral direction X (the dimension in the lateral direction X of the flange 45), the contraction amount of the elastic layer 31, and the like. In addition, since only one gather that is curved between the first joining lines 31 is formed in the flange portion 45, the shape of the air passage 50 is more stable than when a plurality of gathers are formed. Makes air easier to move. Moreover, since only one gather is formed in the collar part 45, a regular pleated three-dimensional pattern is formed on the outer surface of the diaper 10, so that the design of the appearance can be improved.

  Referring to FIGS. 2 and 3 again, the absorbent panel 12 has a front end portion 12A located in the front waist region 13, a rear end portion 12B located in the rear waist region 14, and the front and rear end portions 12A and 12B. An intermediate portion 12 </ b> C extending in the vertical direction Y and defining the crotch region 15. Moreover, the absorptive panel 12 is located in the skin opposing surface side, the inner surface sheet | seat 51 made from the fiber nonwoven fabric which has liquid permeability, the liquid absorption core 52 which has a curved both-sides edge, and at least absorptivity. It has a liquid-impervious leak-proof sheet 53 that covers the entire bottom surface of the core 52 and a liquid-impervious outer sheet 54 that forms the entire non-skin facing surface of the absorbent panel 12. The absorbent core 52 includes a core material formed from a mixture of fluffed wood pulp and superabsorbent polymer particles, and a liquid-absorbing and diffusible core cover sheet (not shown) such as tissue paper covering the entire core material. ). The absorbent panel 12 is provided with a plurality of strand-like or string-like leg elastic bodies 55 extending in the longitudinal direction Y at both side edges. By arranging the leg elastic body 55, leg elastic regions are formed at both side edges of the crotch region 15, and the leg opening edges are formed by the front and rear elastic regions and leg elastic regions of the front and rear waist regions 13 and 14. A virtual elastic band extending in an annular shape so as to surround the wearer's thigh in the wearing state is formed. In addition, although not shown in figure, in order to prevent a side leak of excrement, you may arrange | position a pair of leak-proof walls which stand toward a wearer's body in a wearing condition in the both sides of the absorbent panel 12. .

  4A, 4B, and 5, the outer sheet 30 has a plurality of first openings (outer openings) 61 passing therethrough, and the intermediate sheet 32 has a plurality of holes passing therethrough. The second opening (inner opening) 62 is located. On the other hand, unlike the sheets 30 and 32, the inner layer sheet 33 is not formed with a plurality of openings. In order to improve the air permeability of the diaper 10 and prevent the internal stuffiness, it is conceivable to form a plurality of openings in all of the inner and outer layer sheets 30, 33 and the intermediate sheet 32. In such a case, the diaper 10 Internal excrement may leak out from the opening of the inner layer sheet 33. Further, in the portion where the opening of each sheet overlaps in the thickness direction Z, the sheet strength is greatly reduced compared to other portions, and when the diaper 10 is pulled up at the time of wearing, the portion having the low sheet strength is started. As a result, sheet tearing may occur.

  In the wearing article according to the present embodiment, since the plurality of openings are not formed in the inner layer sheet 33, the excrement inside does not leak to the outside, and the sheet strength is greatly reduced locally. Absent. Moreover, since the inner layer sheet 33 has moisture permeability, even if a plurality of openings are not formed, the air (inside air) in the diaper 10 can be transmitted to the outside, and the diaper 10 can be prevented from stuffiness. it can. The flow of air between the inside and the outside of the diaper will be described. First, the inside air that has passed through the inner layer sheet 33 passes through the second opening 62 and moves into the ventilation path 50. The inside air that has moved into the air passage 50 passes through the first opening 61 and is released to the outside of the diaper 10. On the other hand, air outside the diaper 10 (outside air) moves from the first opening 61 into the air passage 50 and passes through the second opening 62 and permeates the inner layer sheet 33 and enters the inside of the diaper 10. it can. As described above, the excretion of the diaper 10 can be improved and the internal stuffiness can be prevented without excrement leaking to the outside or the sheet strength is partially greatly reduced.

  The outer layer sheet 30 and the intermediate sheet 32 are joined to each other by a plurality of first and second joining lines 41 and 42 extending in the longitudinal direction Y, and the outer end opening of the air passage 50 located at the waist opening edge. The air can enter and exit from the diaper, and the diaper 10 has excellent air permeability as compared with the case where the outer end opening is sealed. However, the outer end opening may be sealed as long as the inflow and discharge of air can be controlled so that the inside of the diaper 10 does not get steamed in the first and second openings 61 and 62.

  As long as the diaper 10 has a predetermined air permeability, at least one of the first and second openings 61 and 62 may be formed. In such a case, if the sheet without a plurality of openings, for example, the outer layer sheet 30 has a plurality of first openings 61, but the second opening 62 is not disposed in the intermediate sheet 32, the intermediate sheet It is preferable that 32 has at least moisture permeability or air permeability. On the other hand, when the intermediate sheet 32 has a plurality of second openings 62 and the first opening 61 is not arranged in the outer layer sheet 30, it is preferable that the outer layer sheet 30 has moisture permeability or air permeability.

  Moreover, in the manufacturing process of the diaper 10, the 1st and 2nd opening 61,62 is not formed by the through-hole which penetrates them in the state which laminated | stacked the outer layer sheet | seat 30 and intermediate sheet 32 made from a fiber nonwoven fabric. Each of the sheets 30 and 32 is formed by performing punching processing such as punching processing or hot embossing separately. Therefore, there is a possibility that those opening edges are welded or a burr is generated and directly touching the skin may cause irritation. However, since such an opening is not formed in the inner layer sheet 33, the skin is stimulated. It will never be done. In addition, since the fiber nonwoven fabric in which a plurality of openings are formed in advance is laminated in this way, the front and rear waist elastic bodies 35 and 36 are disposed between the inner layer sheet 33 and the intermediate sheet 32, and then drilling is performed. There is no possibility that the front and rear waist elastic bodies 35 and 36 are cut when drilling. In particular, when the first joining line 41 is formed of an adhesive, it is necessary to adjust the positions of the portion where the adhesive is applied and the portion where the opening is formed so that the adhesive does not leak from the opening. This is a big problem in high-speed production lines, and the first joining line is a sealing line by welding processing, and openings are formed in the outer layer sheet 30 and the intermediate sheet 32 in advance to solve such manufacturing problems. can do.

  Referring to FIG. 6, the first opening 61 and the second opening 62 do not overlap with each other in a plan view of the diaper 10. If both openings 61 and 62 overlap each other in plan view, the sheet strength may be reduced at the overlapping portion and cause sheet breakage, but both openings 61 and 62 do not overlap each other in plan view. Therefore, a portion having a low sheet strength formed only from the inner layer sheet 33 is not formed, and there is no possibility that the sheet breaks during the wearing operation. However, it is possible that the outer layer sheet 30 and the intermediate sheet 32 are arranged in different patterns, and when they are stacked, some of them may overlap each other in plan view. Therefore, “the first and second openings 61 and 62 do not overlap each other in the plan view of the diaper 10” means that the first and second openings 61, 61 are formed by the openings that penetrate the outer layer sheet 30 and the intermediate sheet 32. 62 are formed at the same time (when all the first openings 61 and the second openings 62 overlap in a plan view), the first and second openings 61 and 62 are accidentally part of each other in a plan view. For example, a case where about 5% or less of the first openings 61 overlap with the second openings 62 in plan view is included. In such a case, since there are only a few portions consisting only of the inner layer sheet 33, there is no possibility of sheet tearing from the portions during wearing.

Referring to FIGS. 5 and 6, the arrangement pattern of the first and second openings 61 and 62 can be selected as appropriate. However, in order for the diaper 10 to have the required air permeability, the presence of the collar portion 45 is present. It is preferable that they are arranged at predetermined intervals in the vertical direction Y in the region. In the present embodiment, the diameters of the first and second openings 61 and 62 are about 0.5 to 3.0 mm, and the separation dimensions R3 and R4 in the longitudinal direction Y of both the openings 61 and 62 are about 5 to 15 mm. The lateral direction X separation dimensions R5 and R6 are preferably about 5 to 15 mm. Further, the aperture ratio of the first and second openings 61 and 62, that is, the ratio of the total area of the first opening 61 to the total area of the outer layer sheet 30 and the ratio of the total area of the second opening 62 to the total area of the intermediate sheet 32. Is preferably about 2% or more. Moreover, it is preferable that the water vapor transmission rate of the inner layer sheet 33 is 100 m ³ / m ² / sec or more.

<Measurement method of moisture permeability>
The moisture permeability of the inner layer sheet 33 was measured by a method based on a fragile method of JIS L1096A using a known air permeability tester, for example, KES-F8-AP1 manufactured by Kato Tech Co., Ltd. For the measurement, a sample obtained by cutting a part of the inner layer sheet 33 into a predetermined size is set at a predetermined position of the testing machine, and air of a constant flow rate V (unit: m ³ / m ² · s) is passed through the sample. The pressure difference ΔQ (unit: kPa) was measured. The measured value ΔQ is divided by the flow rate V to obtain the ventilation resistance R (unit: kPa · s / m), and the moisture permeability P (unit: m ³ / m ² / sec) is P = K (constant) / R. The average value of the five measurement results was calculated as the moisture permeability of the inner layer sheet 33. The first and second openings 61 and 62 may have various well-known shapes such as an ellipse, a rectangle such as a rectangle or a square, a triangle, and a star, in addition to a circle as illustrated.

  As described above, in the first joining line 41, the outer layer sheet 30 and the intermediate sheet 32 are sealed by heat welding or ultrasonic welding. Since both sheets 30 and 32 are welded in the 1st joining line 41, joining strength becomes high compared with joining by adhesives. Moreover, when the 1st joining line 41 is formed by apply | coating an adhesive agent, there exists a possibility that an adhesive agent may leak outside from the 1st and 2nd opening 61,62 located on the 1st joining line 41. FIG. However, there is no possibility that such a situation will occur because it is welded.

The outer layer sheet 30, the intermediate sheet 32, and the inner layer sheet 33 are made of fiber nonwoven fabric, and the mass per unit area of the inner layer sheet 30 is smaller than the mass per unit area of the outer layer sheet 30 and the intermediate sheet 32. It is preferable. Although the inner layer sheet 33 does not have a plurality of openings, it has moisture permeability that allows air inside the diaper 10 to pass therethrough, and is relatively thin to have moisture permeability, and has a unit area. The hit mass is preferably low, for example, the outer layer sheet 30 and the intermediate sheet 32 have a mass of about 13 to 25 g / m ² and the inner layer sheet 33 has a mass of about 11 to 13 g / m ² .

  Referring to FIGS. 2 and 3 again, the first and second openings 61 and 62 are not disposed in the inner end portions 13A and 14A of the front and rear waist regions 13 and 14, respectively. Since the inner end portions 13A and 14A form leg opening edges together with both side edges of the absorbent panel 12, the seats are easily broken by the movement of the wearer's thighs. Therefore, by not arranging the first and second openings 61 and 62 at the inner end portions 13A and 14A, the required sheet strength is maintained and sheet tearing due to movement of the wearer's thigh is suppressed. Moreover, since the vapor | steam generate | occur | produced inside the diaper 10 moves upwards via the ventilation path 50 in a wearing condition, even if these openings 61 and 62 are not arrange | positioned in inner end part 13A, 14A located below There is no risk that air permeability will be greatly reduced.

<Modification>
FIG. 7 is an expanded plan view similar to FIG. 2 of the diaper 10 in an example of a modification. In the present modification, the first joint line 41 is disposed only at the central portions 13C and 14C of the front and rear waist regions 13 and 14, and the second joint line 42 is disposed at the inner and outer end portions 13A, 13B, 14A, and 14B. ing. Further, in the front waist region 13 (front waist panel 16), the first and second openings 61 and 62 are not arranged in a portion (outer portion) 65 located outside the absorbent panel 12 in the longitudinal direction Y. . On the other hand, in the rear waist region 14 (rear waist panel 17), the first and second openings 61 and 62 are arranged in a portion (outer portion) 66 located outside the longitudinal direction Y of the absorbent panel 12. Since the outer portions 65 and 66 of the front and rear waist regions 13 and 14 are portions that are grasped and pulled up when the diaper 10 is worn, it is preferable that the outer portions 65 and 66 have a required sheet strength so that sheet tearing does not occur. In particular, the outer portion 65 of the front waist region 13 is a portion that the wearer wears and pulls up when the wearer wears it, and the first and second openings 61 and 62 are not disposed, so that the required sheet strength is obtained. Can be maintained, and when the diaper 10 is pulled up, it is possible to suppress a part from being torn. Moreover, the outer part 66 located outside the longitudinal direction Y of the absorbent panel 12 in the rear waist region 14 is a part that comes into contact with the waist of the wearer and is easily stuffy due to excrement located on the back side. Although skin troubles such as rash are likely to occur, in the present modification, the first and second openings 61 and 62 are located in the portion 66, so that air permeability is good, and such skin troubles are prevented. Can be suppressed.

  In this modified example, the first and second openings 61 and 62 are not present in the outer portion 65 of the front waist region 13, but the first and second openings are in the outer portion 65 of the front waist region 13. 61 and 62 may be arranged, and the non-existence area of the first and second openings 61 and 62 may be arranged on the outer portion 66 of the rear waist area 14.

  For the members constituting the absorbent article 10, unless otherwise specified, in addition to the materials described in the present specification, known materials that are usually used in this kind of field are used without limitation. Can do. In addition, terms such as “first” and “second” used in the present specification are merely used to distinguish similar elements, positions, and the like.

10 disposable wearing article 11 waist panel 12 absorbent panel 13 front waist region (first or second waist region)
13A Inner end 14 of front waist region Rear waist region (first or second waist region)
14A Inner end 15 of rear waist region Crotch region 30 Outer layer sheet 31 Elastic layer 32 Intermediate sheet 33 Inner layer sheet 35 Elastic member (front waist elastic body)
36 Elastic member (rear waist elastic body)
41 joint (first joint line)
42 joint (second joint line)
45 Non-joined part (buttock)
61 opening (first opening)
62 Opening (second opening)
X Horizontal direction Y Vertical direction

Claims (7)

A longitudinal direction and a transverse direction intersecting with it, a skin facing surface and a non-skin facing surface, a first waist region that is one of the front and rear waist regions, and a second waist region that is the other of the front and rear waist regions; In a disposable wearing article including a crotch region located between the first and second waist regions, a waist opening and a pair of leg openings,
At least the first waist region of the first and second waist regions has an outer layer sheet positioned on the non-skin facing surface side, and an elastic layer positioned on the skin facing surface side,
The outer layer sheet has a plurality of joint portions extending in the longitudinal direction and a plurality of non-joint portions positioned between the joint portions, and is joined to the elastic layer at the joint portion,
The elastic layer includes an intermediate sheet positioned on the non-skin facing surface side, a moisture-permeable inner layer sheet positioned on the skin facing surface side, and the lateral direction interposed between the intermediate sheet and the inner layer sheet. An elastic member extending,
At least one of the outer layer sheet and the intermediate sheet has a plurality of openings arranged to be separated from each other in the longitudinal direction and the lateral direction,
The wearing article, wherein the opening is not formed in the inner layer sheet.   The wearing article according to claim 1, wherein the outer layer sheet and the intermediate sheet are welded to each other at the joint portion.   The plurality of openings have a first opening located in the outer sheet and a second opening located in the intermediate sheet, and the first opening and the second opening do not overlap each other in plan view. Item 3. The wearing article according to Item 1 or 2.   The inner layer sheet, the intermediate sheet and the outer layer sheet are formed from a fiber nonwoven fabric sheet, and the mass per unit area of the inner layer sheet is more than the mass per unit area of the intermediate sheet and the outer layer sheet. The wearing article in any one of Claims 1-3 small.   The wearing article according to any one of claims 1 to 4, wherein the plurality of openings are not arranged at inner end portions of the first and second waist regions.   A waist panel that defines the first and second waist regions; and an absorbent panel that extends from the crotch region to the first and second waist regions, wherein the plurality of openings include the first and second openings. The wearing article according to any one of claims 1 to 5, which is disposed on the outer side in the longitudinal direction of the absorbent panel in one waist region of the waist region.   Each of the plurality of openings has a dot shape and has a diameter of about 0.5 to 2.5 mm, the vertical separation of about 5.0 to 20.0 mm, and the lateral separation of about The wearing article according to any one of claims 1 to 6, which is 5.0 to 20.0 mm.

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