JP6396784B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  An absorbent article such as a disposable diaper is provided with an absorbent main body including a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorber disposed between both sheets. Are known. Moreover, since the inside of the absorbent article is likely to increase in humidity due to urination or sweating of the wearer during the wearing of the absorbent article, the skin trouble such as redness and itching of the wearer's skin is likely to occur. In particular, in the disposable diaper, the waist and its peripheral part are in close contact with the wearer's skin, so that the close contact is likely to cause sweating and skin troubles are likely to occur. Therefore, conventionally, in order to easily determine whether or not excrement such as urine has been absorbed, the disposable diaper has a hot melt adhesive that changes color when it comes into contact with urine, ink that flows color, printing that causes patterns to emerge, etc. An indicator has been placed.

  For example, in Patent Document 1, in a so-called pants-type disposable diaper provided with an absorbent main body and an exterior body joined to the non-skin facing surface side of the absorbent main body, the longitudinal end of the absorbent body in the absorbent main body It is described that an indicator composite material in which an indicator that changes color by contact with moisture is fixed to a sheet material between an edge and a waist edge of the diaper is described. This indicator composite is a separate member from the absorbent main body, and is fixed to the longitudinal edge of the absorber. Moreover, the exterior body in the disposable diaper of patent document 1 is very general as an exterior body in this kind of underpants-type disposable diaper, and a plurality of thread-like elastic members are stretched between two nonwoven fabrics. The two nonwoven fabrics and the elastic member are joined to each other at a common joint. According to the disposable diaper described in Patent Document 1, it is supposed that the use situation of the absorbent body, the risk of leakage from around the waist, and the sweating situation of the wearer can be detected visually. Patent Document 2 describes that an indicator is arranged on a top sheet of a so-called unfolded diaper so that the presence or absence of dirt can be quickly confirmed even in a dim environment. FIG. As an example of the arrangement form, there is described a form in which the indicator is arranged over the entire length in the longitudinal direction of one surface sheet having a longitudinal length longer than that of the absorber.

JP 2009-131356 A JP 2003-190210 A

  In order to realize skin-friendly absorbent articles that are unlikely to cause skin troubles, indicators that can cause skin troubles, such as stuffiness inside absorbent articles during wear, and wetness of members that touch skin such as face sheets It is necessary to detect it promptly. An absorbent article having a conventional indicator detects either stuffiness or wetting, and no technology that can quickly detect both has been provided.

  Therefore, the subject of this invention is related to the absorbent article which can detect rapidly the wetness of the member which touches a wearer's skin and the wear of the absorbent article during wear, and is kind to skin.

  The present invention relates to an absorbent main body comprising a liquid retaining absorbent body and a surface sheet disposed on the skin facing surface side of the absorbent body, and an exterior body disposed on the non-skin facing surface side of the absorbent main body. And a crotch portion located between the abdominal side portion and the back side portion arranged on the back side of the abdomen and the crotch portion located between them. An absorbent article having a longitudinal direction extending through the back side portion and a transverse direction perpendicular thereto, wherein the longitudinal edge of the absorbent body and the waist edge of the absorbent article in the back side portion There is an extension portion of the surface sheet extending outward in the vertical direction from the longitudinal edge of the absorber, and the extension portion of the surface sheet has an indicator that changes color in contact with moisture. And the skin facing surface of the extending portion of the surface sheet is covered with a moisture-permeable covering sheet, the surface sheet The exterior body is present on the non-skin facing surface side of the extension portion, and the exterior body is relatively disposed on the side farther from the wearer's skin, and the wearer than the outer layer sheet. The inner layer sheet disposed on the side close to the skin and a plurality of elastic members interposed between the two sheets, and both sheets are intermittently disposed in both the longitudinal direction and the lateral direction. In a portion excluding both ends in the length direction of the elastic member, the elastic members are joined to each other by a plurality of joints, and the elastic members are arranged in a laterally extending state so as not to pass through the joints. Provided is an absorbent article that is not fixed to both sheets, and each sheet is formed by forming a plurality of ridges extending continuously in the longitudinal direction across the plurality of elastic members. It is.

  ADVANTAGE OF THE INVENTION According to this invention, the moisture in the absorbent article inside wear, the wetness of the member which touches a wearer's skin can be detected rapidly, and the absorbent article which is kind to skin is provided.

FIG. 1 is a perspective view schematically showing an example of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin facing surface side in the developed and extended state of the diaper shown in FIG. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 4 is a schematic exploded perspective view of the diaper shown in FIG. FIG. 5 is a perspective view schematically showing a part of the outer surface of the diaper shown in FIG. 1, specifically, an indicator in the exterior body and a portion corresponding to the vicinity thereof. FIG. 6 is a vertical cross-sectional view schematically showing a cross section taken along line II-II in FIG. 2, that is, a cross section of the waist edge at the back side and the vicinity thereof. FIG. 7 is a diagram illustrating the positional relationship between the indicator and the joint portion of the exterior body in the diaper illustrated in FIG. 1. FIG. 8 is a view corresponding to FIG. 2 of another embodiment of the absorbent article of the present invention. FIG. 9 is a view corresponding to FIG. 2 of still another embodiment of the absorbent article of the present invention.

  The absorbent article of the present invention will be described below based on preferred embodiments with reference to the drawings. 1 to 4 show a basic configuration of a diaper 1 that is an example of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. As shown in FIG.1 and FIG.2, the diaper 1 is located between the abdominal side part 1F distribute | arranged to a wearer's abdominal side in the wearing state, the back | dorsal part 1R distribute | arranged to the back | dorsal side, and them. While having the crotch part 1M distribute | arranged to a wearer's crotch part, it has the vertical direction X and the horizontal direction Y orthogonal to this. The longitudinal direction X of the diaper 1 is a direction extending through the crotch part 1M between the abdominal side portion 1F and the back side portion 1R, and coincides with the longitudinal direction of the absorbent main body 2 or the absorbent body 23 that is a constituent member thereof. To do. The crotch 1M is an area where the exterior body 3 is not disposed.

  The diaper 1 includes an absorbent main body 2 and an exterior body 3 that is disposed on the non-skin facing surface side of the absorbent main body 2 and fixes the absorbent main body 2. The absorptive main body 2 has a rectangular shape in plan view as shown in FIG. 2, and the longitudinal direction of the absorbent main body 2 is aligned with the longitudinal direction X of the diaper 1 in the unfolded and extended state. Bonded with adhesive. The “expanded and extended state” of the diaper 1 is a state in which the diaper 1 is separated by the side seal portion S to be in an expanded state, and the expanded state diaper 1 is expanded to the design dimensions by extending the elastic member of each part. Say. The design dimension here is the same as the dimension when the absorbent article is spread in a flat state in a state where the influence of the elastic member is completely eliminated.

  As shown in FIG. 3, the absorbent main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, a liquid-impermeable or liquid-permeable back sheet 22 that forms a non-skin-facing surface, and both The liquid holding absorbent 23 is disposed between the sheets 21 and 22, and these are integrated by a known joining means such as an adhesive. As the top sheet 21, the back sheet 22, and the absorber 23, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet 21, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 22. The back sheet 22 has, for example, a liquid-impermeable film sheet alone and a form in which, for example, non-woven fabric is laminated and disposed on the non-skin facing side of the film sheet. The absorbent body 23 includes an absorbent core made of an aggregate of absorbent materials, and the outer surface of the absorbent core may be covered with a liquid permeable core wrap sheet such as paper or nonwoven fabric. good. As an absorptive material used for an absorptive core, fiber materials, such as a water-absorbing polymer, wood pulp, and synthetic fiber hydrophilized, etc. can be used.

  In this specification, the “skin facing surface” refers to a surface of the absorbent article or a component thereof (for example, the absorbent body 23) that is directed toward the wearer's skin when the absorbent article is worn, that is, the wearer's skin. The “non-skin facing surface” is a surface that is directed to the side opposite to the skin side when the absorbent article is worn, that is, the side that is relatively far from the wearer's skin. It is. In addition, "at the time of wearing" here means the state in which the normal proper wearing position is maintained, and does not include the case where the absorbent article is in a state shifted from the wearing position.

  As shown in FIG. 2 and FIG. 3, a pair of protection members made of a liquid-resistant or water-repellent and breathable sheet material are provided on the left and right side portions along the longitudinal direction X on the skin facing surface of the absorbent main body 2. Leakage cuffs 24, 24 are provided. In the vicinity of the free end portion of the leak-proof cuff 24, at least one elastic member 25 for forming a leak-proof cuff is arranged in an extended state. The leak-proof cuff 24 stands up when the elastic member 25 arranged in the stretched state contracts when the diaper 1 is worn, and prevents the liquid from flowing out to the side.

  The exterior body 3 is divided into an exterior body abdominal area disposed on the wearer's belly side when worn, and an exterior body back side area disposed on the back side. The latter comprises a back side seat member 32. That is, as shown in FIG. 2, the diaper 1 of the present embodiment includes an abdominal sheet member 31 disposed on the wearer's stomach side, a back sheet member 32 disposed on the wearer's back side, 1 is provided with a vertically long absorbent main body 2 that is fixed over the sheet members 31 and 32. Both side edge portions 3S and 3S along the longitudinal direction X of both the sheet members 31 and 32 are joined to each other in FIG. As shown, a pair of side seal portions S, S, a waist opening WH, and a pair of leg openings LH, LH are formed. In the side seal portion S, the ventral sheet member 31 and the dorsal sheet member 32 are joined by a known joining means such as an adhesive, a heat seal, a high frequency seal, and an ultrasonic seal.

  As shown in FIG. 3 and FIG. 4, the abdominal sheet member 31 and the back sheet member 32 constituting the exterior body 3 are arranged on the side far from the wearer's skin, respectively. The outer layer sheet 35 to be formed, the inner layer sheet 36 disposed closer to the wearer's skin than the outer layer sheet 35, and a plurality of thread-like or belt-like exteriors fixed in an extended state between the sheets 35, 36 The body forming elastic member 33 has a rectangular shape that is long in the lateral direction Y in the unfolded state of the diaper 1 as shown in FIG.

  2 and 4, the outer layer sheet 35 has the same length in the lateral direction Y as that of the inner layer sheet 36, but the length in the longitudinal direction X is longer than that of the inner layer sheet 36. When the sheets 35 and 36 are stacked so that the inner ends 35b and 36b in the longitudinal direction X coincide with each other, the outer end 35a in the longitudinal direction X of the outer layer sheet 35 is in the longitudinal direction of the inner layer sheet 36. It extends outward in the longitudinal direction X from the outer end 36a of X. As shown in FIG. 2, the extending portion 35 </ b> E of the outer layer sheet 35 is folded back toward the inner layer sheet 36 at each of the abdominal side portion 1 </ b> F and the dorsal side portion 1 </ b> R. Between the protruding portion 35E and the inner layer sheet 36, the end portion in the longitudinal direction X of the absorbent main body 2 is disposed. The extending portion 35 </ b> E of the outer layer sheet 35 and the inner layer sheet 36 facing each other are bonded to each other at a predetermined site by an adhesive.

  As shown in FIGS. 2 and 5, the exterior body 3, that is, the ventral sheet member 31 and the back sheet member 32 has the following configurations (1) to (3). The exterior body 3 having the following configurations (1) to (3) conforms to, for example, the formation method of the manufacturing method of the composite stretchable part described in Japanese Patent Application Laid-Open No. 2009-118986 according to the earlier application of the present applicant. It can be manufactured by a method.

(1) The outer layer sheet 35 and the inner layer sheet 36 are joined to each other by a plurality of joint portions 37 that are intermittently arranged in both the longitudinal direction X and the transverse direction Y.
(2) The elastic member 33 for forming the outer body is disposed in an extended state in the lateral direction Y so as not to pass through the joint portion 37, and both sheets are provided at portions excluding both ends in the length direction of the elastic member 33. It is not fixed to 35,36. More specifically, in the exterior body 3, a plurality of elastic members 33 are intermittently disposed in the longitudinal direction X, and are respectively disposed in an expanded state in the lateral direction Y so as not to pass through the joint portion 37. At the same time, the elastic member 33 is not fixed to the sheets 35 and 36 except for both ends in the lateral direction Y, which is the length direction. That is, each elastic member 33 is fixed to the outer layer sheet 35 and the inner layer sheet 36 only at both ends thereof.
(3) Each of the sheets 35 and 36 forms a plurality of ridges 38 (gather) continuously extending over the plurality of elastic members 33.

  The joint portion 37 in the exterior body 3 (the abdominal sheet member 31 and the back sheet member 32) is formed not only by the fusion of the outer layer sheet 35 and the inner layer sheet 36 constituting the exterior body 3, but also by application of an adhesive. However, from the viewpoint of improving the visibility of the indicator 4 described later, it is preferable to form the two sheets 35 and 36 by fusing. That is, it is preferable that the joint portion 37 is a fused portion of a plurality of sheets 35 and 36 constituting the exterior body 3. In the joint portion 37 composed of the fused portions of the plurality of sheets 35 and 36, since the sheets 35 and 36 made of nonwoven fabric or the like are formed into a film to form a transparent thin film, an indicator existing on the inner surface side of the exterior body 3 4 can be visually recognized from the outside of the diaper 1 through the transparent joint portion 37 formed of the fused portion. Further, when the joint portion 37 is a fusion portion, the float (distance) from the inner layer sheet 36 of the outer layer sheet 35 constituting the exterior body 3 is smaller in the vicinity of the joint portion 37 than in other parts. The indicator 4 is easily seen through the exterior body 3, while the float (distance) between the sheets 35 and 36 increases near the top of the flange 38 positioned between the joint portions 37 and 37. The indicator 4 is transparent through the body 3 and is difficult to see. Due to the difference in the degree of sheerness of the indicator 4, the degree of sheerness of the single color indicator 4 continuous in the lateral direction Y looks like a gradient in the lateral direction Y due to the shape of the collar 38, and the appearance of the diaper 1 is improved. To do. Formation of the joint portion 37 by fusing the sheets 35 and 36 can be performed by a known resin sheet fusing method such as embossing with heat and ultrasonic sealing.

  In each of the abdominal sheet member 31 and the back sheet member 32 constituting the exterior body 3, the plurality of joint portions 37 are arranged in rows in the expansion / contraction direction of the exterior body 3, that is, the longitudinal direction X and the lateral direction Y orthogonal thereto. The rows of joints 37 extending in the horizontal direction Y and the elastic members 33 are alternately arranged in the vertical direction X. In addition, the planar view shape of the junction part 37 is not restrict | limited to a rectangular shape like illustration, It can set arbitrarily, such as circular shape and elliptical shape. In a natural state, that is, in a state where no external force is applied, the elastic member 33 contracts in the lateral direction Y, and each of the outer layer sheet 35 and the inner layer sheet 36 continues in the longitudinal direction X across the plurality of elastic members 33. Thus, a plurality of ridges 38 extending are formed. In the present embodiment, as shown in FIG. 5, a single collar 38 is formed between the joint portions 37 that are adjacent in the lateral direction Y.

  In the exterior body 3, the plurality of ridges 38 are continuous over the entire length in the direction orthogonal to the expansion and contraction direction of the exterior body 3. The expansion / contraction direction of the exterior body 3 coincides with the lateral direction Y, which is the expansion / contraction direction of the elastic member 33, and accordingly, the plurality of ridges 38 are continuous over the entire length in the vertical direction X. The eaves 38 are hollow, and the inside can function as a ventilation path through which air flows. Thus, the exterior body 3, that is, the abdominal side sheet member 31 and the back side sheet member 32 is formed with a plurality of hollow ridges 38 that can function as ventilation paths over the entire length in the longitudinal direction X. The diaper 1 is excellent in breathability and cushioning properties. In addition, since the plurality of ridges 38 extending in the vertical direction X are regularly aligned in the horizontal direction Y on the outer surface of the exterior body 3, the diaper 1 is also excellent in appearance.

  In addition, in the part which overlaps with the absorptive core 23 in each of the abdominal side sheet member 31, ie, the abdominal side part 1F and the back side sheet member 32, ie, the back side part 1R, as shown in FIG. A non-stretchable portion 33D in which the expression of stretchability is suppressed is formed. In this non-stretchable portion 33D, a vertical hook is not formed, and no ridge 38 is formed. As described above, when the exterior body 3 has the non-stretchable portion 33D in the portion overlapping the absorbent core 23, the absorbent main body 2 including the absorbent core 23 does not cause vertical wrinkles and the absorbent body 2 has It is possible to have the end in the longitudinal direction X along the wearer's body, thereby effectively preventing leakage, and the trace caused by the top of the heel produced in the absorbent main body 2 hitting the skin Inconveniences such as sticking are effectively prevented. As a method for forming the non-stretchable portion 33D, a method usually used in this type of disposable diaper can be used without any particular limitation. For example, the elastic member 33 is divided finely so as not to expand or contract, or bonded. For example, a method of preventing the elastic member 33 from expanding and contracting by bonding using an agent or the like.

  In the exterior body 3, it is preferable that all the elastic members 33 are arranged so as not to pass through all the joint portions 37, but some of the elastic members 33 are not intended for reasons such as manufacturing errors. It may pass through the joint 37 of the part. However, even in that case, most of the plurality of joint portions 37, more specifically, the number of joints corresponding to 70% or more of the number of all joint portions 37 in each of the ventral sheet member 31 and the back seat member 32. In the portion 37, when the elastic member 33 does not pass, the effects and effects expected of the exterior body 3, such as improvement in characteristics such as air permeability, cushioning properties, and appearance, are sufficiently expressed. Therefore, when the elastic member 33 does not pass through 70% or more of the plurality of joint portions 37 provided in the exterior body 3, as defined in (2) above, the elastic member It is the same in the effect that 33 is arrange | positioned so that the junction part 37 may not be passed.

  As the outer layer sheet 35 and the inner layer sheet 36 constituting the exterior body 3 (the abdomen side sheet member 31 and the back side sheet member 32), respectively, the resin is mainly used from the viewpoint of using the joint portion 37 as a fusion part as described above. What is formed as a component is preferable. Specifically, for example, a resin containing a heat-sealable resin such as polyethylene, polyethylene terephthalate, or polypropylene is preferable, and in particular, a nonwoven fabric, a film, or a laminate sheet of a nonwoven fabric and a film. Etc. are preferred. Examples of the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric.

  The diaper 1 of this embodiment is provided with the indicator 4 which contacts and changes color as shown in FIG.1, FIG.2 and FIGS. 4-6. The “discoloration” referred to here includes so-called “color development” from a colorless state to a colored state and so-called “decoloration” from a colored state to a colorless state, in addition to an aspect in which a certain color changes to another color. The discoloration of the indicator 4 can be used as a guideline for the replacement time of the diaper 1. By immediately replacing the diaper 1 with a new one after the discoloration of the indicator 4, the skin trouble of the wearer due to stuffiness or wetting is avoided. It becomes possible. As the indicator 4, it is possible to use an indicator that contains a color material that changes its color when it comes into contact with excrement from the body, including water such as urine and sweat, and is conventionally used as an indicator in this type of absorbent article. Can be used as appropriate. As the color material constituting the indicator 4, for example, a mixture of a pH indicator and an oxidized compound can be used.

  The indicator 4 is formed by applying an indicator composition containing a coloring material or the like to a site where the indicator 4 is to be arranged. As this indicator composition, what mix | blended the material required for expression of an indicator function, such as a coloring material, for example with the well-known hot-melt-adhesive agent can be used.

  As one of the main features of the diaper 1 of the present embodiment, as shown in FIG. 6, the absorption between the longitudinal edge 23XE of the absorbent body 23 and the waist edge WE of the diaper 1 on the back side 1R. There is an extending portion 21E of the topsheet 21 extending outward in the longitudinal direction X from the longitudinal edge 23XE of the body 23, and the indicator 4 is disposed on the extending portion 21E of the topsheet 21, The skin facing surface 21a of the extension part 21E of this surface sheet 21 is mentioned by the point covered with the extension part 35E of the outer layer sheet 35 as a moisture-permeable coating sheet. The exterior body 3 exists on the non-skin facing surface 21b side of the extending portion 21E of the topsheet 21.

  In the present embodiment, as shown in FIGS. 1, 2 and 4, not only the back side portion 1R but also the abdominal side portion 1F is provided with an extending portion 21E of the topsheet 21 in the same manner as the back side portion 1F. The indicator 4 is disposed on the extending portion 21E of the surface sheet 21, and the extending portion 35E of the outer layer sheet 35 as a moisture-permeable covering sheet that covers the skin facing surface 21a of the extending portion 21E is disposed. Has been. Hereinafter, the configuration including the indicator 4 will be mainly described with respect to the back side portion 1R, but the description is also applied to the configuration including the indicator 4 in the ventral side portion 1F unless otherwise specified.

  The indicator 4 has a rectangular shape in a plan view, and one of the indicators 4 is arranged at the central portion in the lateral direction Y of the extending portion 21 </ b> E of the topsheet 21 with its longitudinal direction coinciding with the lateral direction Y. Thus, the diaper 1 of the present embodiment extends the topsheet 21 toward the waist edge WE and arranges the indicator 4 on the extension portion 21E, and the non-skin facing surface 21b of the extension portion 21E. Formed on the exterior body 3 (abdominal sheet member 31 and back sheet member 32) positioned on the side to form the outer surface of the diaper 1 so as to extend in the vertical direction X, which can function as a ventilation path, By configuring the vicinity of the indicator 4 so that air can flow in the vertical direction X, the waist edge WE and its peripheral portion, which are parts that are in close contact with the wearer's skin and easily promote sweating of the wearer, more specifically, In the waist, it is possible to quickly detect by the indicator 4 wetness of a member that touches the skin such as the stuffiness inside the diaper 1 and the surface sheet 21 that causes skin troubles. , It said to be a friendly disposable diapers to the skin. In addition, a waist part is a site | part located in the circumference | surroundings of a wearer's waist in a disposable diaper, and usually 1 to 1 of the full length of the vertical direction X of the diaper 1 from each waist edge WE of the abdominal side part 1F and the back side part 1R. It is an area up to a length of 15%.

  The fact that the inside of the diaper 1 can be detected by the indicator 4 is largely due to the exterior body 3. That is, since the interior of the large number of ridges 38 extending in the longitudinal direction X in the exterior body 3 is derived from excrement such as sweat and urine of the wearer, water vapor that causes stuffiness can pass through the exterior body. The water vapor can be detected by the indicator 4 arranged in the vicinity of 3. Moreover, the surface sheet 21 is a member that is in direct contact with the skin of the wearer, and the wetness of the surface sheet 21 can be a major cause of skin troubles. In this embodiment, the indicator 4 is disposed on the surface sheet 21 itself. Therefore, the wetness can be detected promptly.

  Moreover, as shown in FIG. 6, since the skin opposing surface 21a of the extension part 21E of the surface sheet 21 is covered with the extension part 35E of the outer layer sheet 35, the indicator 4 comes into contact with the skin of the wearer of the diaper 1. Inconvenience caused by the contact of the indicator 4 with the skin, for example, skin troubles and deterioration of the function of the indicator 4 are effectively prevented. On the other hand, since the extending part 35E of the outer layer sheet 35 has at least moisture permeability, water vapor derived from excreta is provided by the extending part 35E so that the indicator 4 is arranged from the wearer's skin side. Therefore, the indicator function of the indicator 4 can be sufficiently exhibited while preventing inconvenience due to the indicator 4 coming into contact with the skin. In particular, in the present embodiment, since the indicator 4 is arranged on the skin facing surface 21a of the extending portion 21E of the top sheet 21, it is effective to employ the extending portion 35E (moisture permeable covering sheet) of the outer layer sheet 35. It is.

  The indicator 4 only needs to be disposed on the extending portion 21E of the topsheet 21, and can be disposed on one or both of the skin facing surface 21a and the non-skin facing surface 21b of the extending portion 21E. As shown in FIG. 6, it is preferable to arrange on the skin facing surface 21a of the extending portion 21E from the viewpoint of enabling prompt detection of the stuffiness on the skin side of the wearer of the diaper 1.

  From the viewpoint of enhancing the visual visibility of the indicator 4 when the diaper 1 being worn is visually observed from the outside, as shown in FIGS. 2 and 5, the indicator 4 includes the exterior body 3 (the ventral sheet member 31 and It is preferable that the elastic member 33 does not overlap the back seat member 32). In other words, in the plan view of the diaper 1 as shown in FIG. 2, the indicator 4 is preferably located between the two exterior body forming elastic members 33, 33 adjacent in the lateral direction Y.

  From the same point of view, in the unfolded and extended state of the diaper 1 as shown in FIG. 2, as shown in FIG. 7, the plurality of joint portions 37 in the exterior body 3 (the abdominal sheet member 31 and the back sheet member 32). It is preferable that the length 4Ly in the horizontal direction Y of the indicator 4 is longer than the pitch Py in the horizontal direction Y. As described above, since the magnitude relationship “the pitch Py of the joint portion 37 <the length 4Ly in the lateral direction Y of the indicator 4” is established, as shown in FIG. 7, as shown in FIG. Since the joint portion 37 that is far from the skin is likely to overlap, as described above, the joint portion 37 overlaps the indicator 4 when the joint portion 37 is a transparent film made of a fused portion of the outer layer sheet 35 and the inner layer sheet 36. The indicator 4 can be visually recognized from the outside of the diaper 1 through the transparent joint portion 37, and the visibility of the indicator 4 is improved.

The ratio of the length 4Ly of the lateral direction Y of the indicator 4 to the pitch Py of the joint portion 37, that is, the length 4Ly / pitch Py is preferably 1 or more, more preferably 2 or more, and preferably 20 or less, more preferably. Is 10 or less, more specifically, preferably 1 or more and 20 or less, more preferably 2 or more and 10 or less.
The length 4Ly (see FIG. 7) of the indicator 4 in the lateral direction Y is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 160 mm or less, more preferably 125 mm or less, more specifically preferably Is from 0.5 mm to 160 mm, more preferably from 1 mm to 125 mm.
The pitch Py (see FIG. 7) in the lateral direction Y of the joint portion 37 is preferably 3 mm or more, more preferably 5 mm or more, and preferably 50 mm or less, more preferably 20 mm or less, more specifically preferably 3 mm. It is 50 mm or less and more preferably 5 mm or more and 20 mm or less.

Moreover, it is preferable to set the dimension etc. of each part of the diaper 1 as follows from a viewpoint of producing the effect by the indicator 4 more reliably.
The separation distance L1 (see FIG. 6) between the waist edge WE of the diaper 1 and the indicator 4 in the vicinity thereof is preferably 20 mm or more, more preferably 30 mm or more, and preferably 110 mm or less, more preferably 55 mm or less. Specifically, it is preferably 20 mm or more and 110 mm or less, and more preferably 30 mm or more and 55 mm or less.
The length 4Lx (see FIG. 7) in the longitudinal direction X of the indicator 4 is preferably 1.5 mm or more, more preferably 3 mm or more, and preferably 20 mm or less, more preferably 10 mm or less, more specifically preferably Is from 1.5 mm to 20 mm, more preferably from 3 mm to 10 mm.

The pitch Px (see FIG. 7) in the longitudinal direction X of the joints 37 is preferably 3 mm or more, more preferably 5 mm or more, and preferably 25 mm or less, more preferably 15 mm or less, more specifically preferably 3 mm. It is 25 mm or less and more preferably 5 mm or more and 15 mm or less.
The length 37Lx (see FIG. 7) in the longitudinal direction X of the joint portion 37 is preferably 1 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, more preferably 7 mm or less, more specifically preferably It is 1 mm or more and 10 mm or less, More preferably, it is 2 mm or more and 7 mm or less.
The length 37Ly (see FIG. 7) of the joint portion 37 in the lateral direction Y is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 60 mm or less, more preferably 30 mm or less, more specifically, Preferably they are 0.5 mm or more and 60 mm or less, More preferably, they are 1 mm or more and 30 mm or less.

  The extending portion 35E of the outer layer sheet 35 that functions as a covering sheet that covers the skin facing surface 21a of the extending portion 21E of the topsheet 21 is preferably hydrophobic. When the covering sheet is hydrophilic, water vapor derived from excrement present on the skin facing surface side of the covering sheet easily passes through the covering sheet and easily reaches the indicator 4 located on the non-skin facing surface side of the covering sheet. Therefore, even though the stuffiness inside the diaper 1 is at a level that does not cause a problem with skin, the indicator 4 may change color in response to the stuffiness. As a result, the indicator 4 There is a possibility that the discoloration time becomes difficult to become a standard for the replacement time of the diaper 1. On the other hand, if the covering sheet is hydrophobic, the excessive reaction of the indicator 4 against the stuffiness is moderately suppressed. Therefore, the discoloration time of the indicator 4 is further used as a guide for the replacement time of the diaper 1. It becomes easy. Whether or not the covering sheet is hydrophobic can be determined based on the contact angle of the constituent fibers of the covering sheet. Specifically, using a commercially available contact angle meter (for example, a contact angle meter manufactured by Kyowa Interface Science Co., Ltd.), a drop of water is dropped on the constituent fibers of the coating sheet to be evaluated, and the contact angle is measured according to a conventional method. When the measured value of the contact angle is 90 degrees or more, it can be determined that the covering sheet is hydrophobic. That is, a large degree of hydrophobicity of the covering sheet is synonymous with a large contact angle of constituent fibers, and a small degree of hydrophobicity is synonymous with a small contact angle of constituent fibers. Moreover, as a method of making a coating sheet hydrophobic, the method of using a nonwoven fabric as a coating sheet and not performing a hydrophilization treatment to the nonwoven fabric, or performing a hydrophobic treatment is mentioned, for example.

  Moreover, it is preferable that the extending part 35 </ b> E of the outer layer sheet 35 functioning as the covering sheet has a lower density than the exterior body 3, that is, the abdominal sheet member 31 and the back sheet member 32. Thus, the diaper 1 on the non-skin-facing surface side of the exterior body 3 is established by the relationship of “the density of the extending portion 35E (cover sheet) of the outer layer sheet 35 <the density of the exterior body 3”. It is possible to detect the stuffiness inside the diaper 1 on the skin-facing surface side of the exterior body 3 while suppressing the influence of external moisture on the exterior, and use the discoloration time of the indicator 4 as a guide for the replacement time of the diaper 1 It becomes easier. As a method for realizing the relationship of “the density of the covering sheet <the density of the exterior body”, for example, when the covering sheet is configured by a part of the exterior body (extension portion) as in the present embodiment, the exterior body There is a method of increasing the thickness of a part of this part by raising or hot air treatment. Moreover, when comprising a coating sheet with a sheet | seat separate from an exterior body, there exists a method of adjusting suitably the basic weight and thickness of an exterior body, or the fineness of the fiber which comprises a coating sheet.

In the back side portion 1R, the ratio of the density 35ED of the extended portion 35E (covering sheet) of the outer layer sheet 35 to the density 3D of the exterior body 3, that is, the back sheet member 32, that is, the density 35ED / density 3D is preferably 0. .2 or more, more preferably 0.4 or more, and preferably 0.99 or less, more preferably 0.8 or less, more specifically preferably 0.2 or more and 0.99 or less, more preferably 0. 4 or more and 0.8 or less. In the ventral side portion 1F, the ratio of the density 35ED of the extending portion 35E (covering sheet) of the outer layer sheet 35 to the density 3D of the exterior body 3, that is, the ventral side sheet member 31, is also the same as the range in the back side portion 1R. Can be set.
Density 3D is the ventral sheet member 31 and the back side sheet member 32, respectively, preferably 0.01 g / cm ³ or more, more preferably 0.05 g / cm ³ or more, and preferably 0.20 g / cm ³ or less More preferably, it is 0.15 g / cm ³ or less, more specifically, preferably 0.01 g / cm ³ or more and 0.20 g / cm ³ or less, more preferably 0.05 g / cm ³ or more and 0.15 g / cm. ³ or less.
Density 35ED of the extension of the exterior sheet 35 out portion 35E (cover sheet) is preferably 0.005 g / cm ³ or more, more preferably 0.01 g / cm ³ or more, and preferably 0.18 g / cm ³ or less, More preferably, it is 0.14 g / cm ³ or less, more specifically, preferably 0.005 g / cm ³ or more and 0.18 g / mm ³ or less, more preferably 0.01 g / cm ³ or more and 0.14 g / mm ^3. It is as follows.

  Hereinafter, another embodiment of the present invention will be described with reference to FIGS. In other embodiments described later, components that are different from the diaper 1 of the above embodiment are mainly described, and the same components are denoted by the same reference numerals and description thereof is omitted. The description of the above embodiment is applied as appropriate to components that are not particularly described.

  In the diaper 1 </ b> A shown in FIG. 8, the area of the joint portion of the exterior body 3 that overlaps the extended portion 21 </ b> E of the topsheet 21 is larger than the other part of the exterior body 3. That is, in the diaper 1A, in the abdomen side sheet member 31 and the back side sheet member 32, three joint portions indicated by reference numeral 37A are located at portions overlapping with the extending portions 21E of the topsheet 21. Each of the joint portions 37 </ b> A has a larger area than the other joint portions 37. The length in the vertical direction X of the joint portion 37A is the same as that of the indicator 4, but the length in the horizontal direction Y is longer in the indicator 4 than in the joint portion 37A. The three joint portions 37A that overlap the extended portion 21E of the topsheet 21 are intermittently arranged in the lateral direction Y, and the entire joint portion 37A located at the center in the lateral direction Y of the extended portion 21E is It overlaps with indicator 4. In this way, the area of the joint portion 37A that overlaps the extending portion 21E of the topsheet 21 is made larger than the area of the joint portion 37 in the other part, so that the joint portion 37A fuses the outer layer sheet 35 and the inner layer sheet 36 together. In the case of a transparent film made of a wearing portion, the indicator 4 can be visually recognized from the outside of the diaper 1 through a transparent joint portion 37A having a relatively large area. Is further improved.

  In the diaper 1 </ b> B shown in FIG. 9, the portion of the exterior body 3 that overlaps the extending portion 21 </ b> E of the topsheet 21 has a shorter pitch in the lateral direction Y of the joint portion 37 than the other portions of the exterior body 3. ing. That is, in the diaper 1B, in the abdominal sheet member 31 and the back sheet member 32, the pitch Py1 in the lateral direction Y of the joint portion 37 in the portion overlapping the extending portion 21E of the topsheet 21 is the joint in the other portion. Shorter than the pitch Py2 in the lateral direction Y of the portion 37. As described above, since the magnitude relationship of “pitch Py1 of the joint portion 37 in the portion overlapping the extending portion 21E of the topsheet 21 <pitch Py2 of the joint portion 37 in the other portion” is established, The part overlapping the extension part 21E of the topsheet 21 and the vicinity thereof are less likely to have wrinkles than other parts, and even if wrinkles enter, the wrinkles are relatively small. In the case where the film is made of a fused portion with the inner layer sheet 36 and is a transparent film, the visibility of the indicator 4 through the transparent bonding portion 37 is further improved.

  As mentioned above, although embodiment of this invention was described, this invention is not restrict | limited to the said embodiment, It can change suitably. For example, in the above-described embodiment, the moisture-permeable covering sheet that covers the skin facing surface 21a of the extending portion 21E of the topsheet 21 is the outer layer sheet 35 that is a constituent member of the exterior body 3, more specifically, the outer layer sheet. 35 is an extended portion 35E from the inner layer sheet 36 (a folded portion toward the inner layer sheet 36), but the covering sheet may be a separate sheet from the outer package 3. Moreover, in the said embodiment, although the indicator 4 was distribute | arranged to both the abdominal part 1F and the back | dorsal part 1R, it should just be distribute | arranged to the back | dorsal part 1R at least.

  Moreover, in the said embodiment, the abdominal part 1F (abdominal sheet member 31) and the back | dorsal part 1R (back | dorsal sheet member 32) are respectively the stretchable part of the elastic member 33 in the part which overlaps with the absorptive core 23. Although the non-stretchable portion 33D in which the expression is suppressed is included, the elastic member 33 continuously extends over the entire length in the lateral direction Y without the non-stretchable portion 33D, and over the entire length. You may be able to express the inherent elasticity. Moreover, although the said embodiment is an example which applied this invention to the underpants type disposable diaper, this invention is applicable similarly to other wearing articles, for example, a shorts type sanitary napkin. All the parts of only the one embodiment described above can be used together as appropriate.

1,1A, 1B Pants-type disposable diaper (absorbent article)
2 Absorbent body 21 Top sheet 21E Surface sheet extension 21a Surface sheet skin facing surface 22 Back sheet 23 Absorber 23XE Vertical edge 24 of the absorber Leak-proof cuff 3 Exterior body 31 Ventral sheet member (exterior body) Ventral region)
32 Back sheet member (exterior body back side area)
33 exterior member forming elastic member 33D non-stretchable portion 35 outer layer sheet 35E extended portion of outer layer sheet (moisture-permeable covering sheet)
36 Inner layer sheet 37, 37A Joint portion 38 襞 4 Indicator 1F Abdomen side portion 1M Crotch portion 1R Back side portion WH Waist opening portion WE Waist edge LH Leg opening portion X Vertical direction Y Horizontal direction

Claims (8)

An absorbent main body comprising a liquid-retaining absorbent body and a surface sheet disposed on the skin facing surface side of the absorbent body; and an exterior body disposed on the non-skin facing surface side of the absorbent main body. An abdominal side portion disposed on the abdomen side of the wearer, a back side portion disposed on the back side, and a crotch portion positioned therebetween, and the back from the abdominal side portion through the crotch portion. An absorbent article having a longitudinal direction extending to the side and a transverse direction perpendicular thereto,
Extension of the topsheet extending longitudinally outward from the longitudinal edge of the absorbent body between the longitudinal edge of the absorbent body and the waist edge of the absorbent article at the back side The surface sheet is provided with an indicator that changes color when in contact with moisture, and the skin facing surface of the extended portion of the surface sheet is covered with a moisture-permeable covering sheet. And the exterior body exists on the non-skin facing surface side of the extending portion of the surface sheet,
The exterior body is disposed between the two sheets, an outer layer sheet relatively disposed on the side farther from the wearer's skin, an inner layer sheet disposed closer to the wearer's skin than the outer layer sheet, and A plurality of elastic members, and both the sheets are joined to each other by a plurality of joints arranged intermittently in both the longitudinal and lateral directions, and the elastic members pass through the joints. The elastic member is arranged in a stretched state in a lateral direction so that it is not fixed to both sheets except for both ends in the length direction of the elastic member, and each of the sheets has a plurality of elastic members. An absorbent article that is formed by forming a plurality of ridges extending continuously in the longitudinal direction.   The absorbent article according to claim 1, wherein the indicator is disposed on a skin facing surface of the extending portion of the top sheet.   The absorbent article according to claim 1 or 2, wherein the indicator does not overlap the elastic member in the exterior body. The joint is a joint by fusion,
The absorbent article according to any one of claims 1 to 3, wherein a lateral length of the indicator is longer than a lateral pitch of the plurality of joint portions in the exterior body. The joint is a joint by fusion,
The absorptive article according to any one of claims 1 to 4 in which a part which overlaps with an extension part of said surface sheet in said exterior body has a large area of said joined part compared with other parts of said exterior body. . The joint is a joint by fusion,
The site | part which overlaps with the extension part of the said surface sheet in the said exterior body has a horizontal pitch of the said junction part shorter than the other site | part of this exterior body, The Claim 1 any one of Claims 1-5. Absorbent article.   The said covering sheet is hydrophobic, The absorbent article as described in any one of Claims 1-6.   The absorbent article according to any one of claims 1 to 7, wherein the covering sheet has a lower density than the exterior body.

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