JP2010042162A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper hard to cause the leak from a crotch part and effectively preventing the occurrence of skin trouble such as a rash. <P>SOLUTION: The disposable diaper 1A is equipped with an absorber 22, a topsheet 18 and a backsheet 20. The absorber 22 is constituted so that both side edge parts 52a and 52b of the absorber 2 at least in the crotch part 4 can be folded toward the topsheet 18 and a pair of folded parts 62a and 62b for forming the space demarcated by a wall part composed of both folded side edge parts 52a and 52b and a bottom part comprising the central part 54 in the crotch part 4 of the absorber 22 are formed at least to the crotch part 4 while a pair of folded auxiliary stretchable materials 64a and 64b for assisting folding are arranged to both side edges 22a and 22b of the absorber 22 at least in the crotch part 4 along both side edges 22a and 22b of the absorber 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disposable diaper. More specifically, the present invention relates to a disposable diaper that is unlikely to leak from the crotch part and that can effectively prevent the occurrence of skin troubles such as rash.

  In recent years, as a diaper for infants or the elderly / disability to absorb excrement such as urine and feces, it has been arranged to cover the surface of the absorber and the absorber, and at least a part of the diaper is made of a liquid-permeable material. Disposable diapers (for example, tape-type diapers, pants-type diapers, urine pad, etc.) equipped with a topsheet and a backsheet made of a liquid-impermeable material. (For example, refer to Patent Document 1).

  Such a disposable diaper is used so that the top sheet comes into contact with the wearer's skin, and excrement is absorbed and held in the absorbent body through the liquid-permeable portion of the top sheet. And a liquid-impermeable back sheet arrange | positioned so that the back surface of an absorber may be coat | covered prevents that excrement leaks outside.

JP-A-6-304199

  However, in such a conventional disposable diaper, since a sheet-like absorbent body having a flat surface is used, when the diaper is worn on a wearer, leakage from the crotch part is caused. There was a problem that it was likely to occur.

  In addition, when the diaper is used, the entire crotch part of the diaper is kept in close contact with the wearer's skin, which may cause irritation around the wearer's genital area and cause skin problems such as rash. There was also.

  The present invention has been made in order to solve the above-described problems of the prior art, and it is difficult for leakage from the crotch part to occur, and it is possible to effectively prevent the occurrence of skin troubles such as rash. A disposable diaper is provided.

  As a result of diligent studies to solve the problems of the prior art as described above, the inventor has at least a pair of side edges of the absorbent body at the crotch part of the diaper that are bent into a wall shape toward the top sheet side. By forming the bent portion of the absorbent body into the absorbent body, and when the diaper is worn, the folded portion is bent, and a space is formed in the crotch part such that both side edge portions of the absorbent body become wall portions. The present invention was completed by conceiving that the problems could be solved. Specifically, the following disposable diapers are provided by the present invention.

[1] A top sheet composed of the front body, the crotch part, and the back body, and an absorbent body and at least a part made of a liquid-permeable material, and arranged to cover the surface of the absorbent body And a backsheet made of a liquid-impermeable material and disposed so as to cover the back surface of the absorbent body, and the absorbent body includes at least both side edge portions of the absorbent body in the crotch portion, It is configured to be foldable toward the top sheet side, and at least at the crotch part, a space defined by a wall part made of the side edge parts and a bottom part made of a central part at the crotch part of the absorber is formed. A pair of folding portions is formed, and at least both side edges of the absorber in the crotch part are paired to assist folding along both side edges of the absorber. Disposable diaper folding auxiliary elastic member is disposed.

[2] The disposable diaper according to [1], wherein the absorbent body has the pair of bent portions symmetrically formed in a lateral direction of the absorbent body along a longitudinal direction of the absorbent body.

[3] The pair of bent portions are void portions in which voids are formed in the absorber, the compressed portions are formed by compressing the absorber, or the absorber is formed with a low basis weight. The disposable diaper according to [1] or [2], wherein the disposable diaper is a low basis weight part.

[4] A distance A between the pair of bent portions in the width direction of the absorber and a distance B from one side edge of the absorber to the one bent portion formed on the one side edge side. And the disposable diaper in any one of said [1]-[3] which satisfies the relationship of following formula (1).

  0.2B ≦ A ≦ 2B (1)

[5] The disposable diaper according to any one of [1] to [4], further including a pair of leg-surrounding elastic members arranged on the outer side in the width direction of the absorbent body than the pair of bending auxiliary elastic materials.

[6] The disposable diaper according to any one of [1] to [5], wherein the absorber is further formed with one or more second bent portions between the pair of bent portions.

  The disposable diaper of this invention is comprised so that the both-sides edge part of the absorber in a crotch part may bend | fold in a wall shape toward the top sheet side. For this reason, when the diaper is worn, a space is formed in the crotch where both side edges of the absorbent body are walls, so that a sufficient amount of absorption can be secured in the crotch, and excrement such as urine from the crotch Leakage is effectively prevented. In addition, the space formed in the crotch part described above can sufficiently maintain its shape against the movement of the leg part and the change in the posture of the wearer. Can be made difficult to happen.

  In addition, the space formed in the crotch part makes it difficult for the wearer's crotch part, particularly the wearer's genital area, to come into direct contact with the top sheet disposed on the surface of the absorbent body. The irritation is reduced, and skin troubles such as rashes can be effectively prevented.

  Hereinafter, the best mode for carrying out the disposable diaper of the present invention will be specifically described with reference to an example of a tape-type disposable diaper. However, the present invention broadly encompasses disposable diapers (for example, pants-type disposable diapers and the like) having the invention-specific matters, and is not limited to the following embodiments.

[1] Definitions etc .:
The “tape-type disposable diaper” includes the absorbent body 22, the top sheet 18, and the back sheet 20 as in the disposable diaper 1 </ b> A shown in FIGS. 1A and 1B, and the left and right side edges 6 a of the back body 6. , 6b, and means a disposable diaper further provided with a fastening tape 11 for fixing the front body 2 and the back body 6.

  The “front body” is a portion (reference numeral 2 in the figure) that covers the wearer's ventral side (front of the body) when the disposable diaper is attached to the wearer like the disposable diaper 1A shown in FIG. "Inseam" is the part that covers the inseam of the wearer when the disposable diaper is attached to the wearer (reference numeral 4 in the figure), and the "rear body" is when the disposable diaper is attached to the wearer. It shall mean the part which covers a wearer's back side (body back) (symbol 6 in the figure).

[2] Configuration of disposable diaper of the present invention:
The disposable diaper of this invention is comprised from each part of the front body 2, the crotch part 4, and the back body 6 like the disposable diaper 1A shown to FIG. 1A-FIG. 1C, and absorber 22 and at least one part are included. A top sheet 18 made of a liquid permeable material and arranged to cover the surface of the absorber 22, and a back sheet 20 made of a liquid impermeable material and arranged to cover the back surface of the absorber 22. The absorbent body 22 is configured such that at least both side edge portions 52 (52a, 52b) of the absorbent body 22 in the crotch part 4 can be bent toward the top sheet 18 side. A pair of bent portions 62 (6) for forming a space 60 defined by the wall portion 53 formed of the portion 52 and the bottom portion 55 formed of the central portion 54 in the crotch part 4 of the absorber 22. a, 62b) is formed, and at least both side edges 22a, 22b of the absorbent body 22 in the crotch part 4 along the both side edges 22a, 22b of the absorbent body 22 are a pair of folding assists. The elastic material 64 (64a, 64b) is arranged.

  As described above, the disposable diaper 1A of the present invention is configured such that the side edge portions 52a and 52b of the absorbent body 22 in the crotch part 4 are bent in a wall shape toward the top sheet 18 side. For this reason, when the diaper is worn, as shown in FIG. 1C, a space 60 is formed in the crotch part 4 where both side edge portions 52a and 52b of the absorbent body 22 become wall parts 53, and the amount of absorption in the crotch part 4 is reduced. Sufficiently secured and leakage of excrement such as urine from the crotch part 4 is effectively prevented. Moreover, since the space 60 formed in the above-mentioned crotch part 4 can maintain the shape enough with respect to the movement of a leg part or the change of a wearer's attitude | position, over a long period at the time of diaper wear. Leakage from the crotch 4 is less likely to occur.

  Further, the space 60 formed in the crotch part 4 makes it difficult for the crotch part of the wearer, particularly the wearer's genital area, to come into direct contact with the top sheet 18 disposed on the surface of the absorbent body 22. The irritation to the genital area is reduced, and skin troubles such as rash can be effectively prevented.

  In the disposable diaper 1A according to the present invention, the side edges 22a and 22b of the absorbent body 22 in the crotch part 4 are bent so that the side edges 52a and 52b of the absorbent body 22 are favorably bent by the pair of bent portions 62a and 62b. A pair of folding assist elastic members 64a and 64b for assisting folding are disposed along the line. For this reason, when the diaper is worn, a contraction force acts from the front body 2 side to the back body 6 side by the folding auxiliary elastic members 64a and 64b, and the side edge portions 52a and 52b of the absorbent body 22 in the crotch part 4 The pair of bent portions 62a and 62b can be favorably bent.

  Here, FIG. 1A is a diagram showing an embodiment of the disposable diaper of the present invention, and is a schematic plan view showing a state in which the disposable diaper is developed and viewed from the top sheet side. FIG. 1B is a schematic cross-sectional view showing the XX ′ cross section of the disposable diaper shown in FIG. 1A. FIG. 1C is a diagram showing a pair of bent portions of the disposable diaper shown in FIG. It is a schematic sectional drawing which shows the state bent.

[2-1] Absorber:
The “absorber” is a member for absorbing and holding the wearer's urine and the like, and is made of an absorbent material. The absorbent body is configured such that at least both side edge portions of the absorbent body in the crotch portion can be bent toward the top sheet side, and at least the crotch portion includes a wall portion including both side edge portions, and the crotch lower portion of the absorbent body. A pair of bent portions are formed for forming a space defined by a bottom portion formed of a central portion in the.

  Examples of the “absorbent material” include fluff pulp, super absorbent polymer (hereinafter referred to as “SAP”), a hydrophilic sheet, and the like. “Fluff pulp” is made by pulverizing wood pulp or non-wood pulp into cotton, “SAP” is sodium polyacrylate, “Hydrophilic sheet” is tissue, absorbent paper, hydrophilized It is preferable to use a non-woven fabric that has been treated.

  As the absorber, it is preferable to use one or two or more absorbent materials formed into a single-layer or multi-layer mat. Especially, what combined 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be mixed in the fluff pulp mat or used in a layered manner between the fluff pulp mats.

  The absorber can be used after being molded into a desired shape such as a rectangular shape, an hourglass shape, a gourd shape, or a T-shape. The absorber is preferably encapsulated with a hydrophilic sheet for the purpose of preventing SAP from falling off and imparting shape stability. Usually, an absorber is inserted | pinched between a top sheet and a back sheet, and is used in the state integrated with both sheets.

  The “pair of bent portions” in the disposable diaper of the present invention is formed at the boundary between the side edge portions and the center portion of the crotch portion of the absorbent body, and at least the both side edge portions of the absorbent body in the crotch portion, It refers to a portion configured to be foldable toward.

  In addition, the above-mentioned “configured to be bendable” means that the boundary portion between the side edge portion and the central portion in the crotch portion of the absorber is formed to bend more easily than other portions, as shown in FIG. 1A. When the disposable diaper in the unfolded state is worn toward the wearer, the absorbent body is curved along the shape of the wearer's body, so that the above-mentioned boundary portion is the boundary, and the That means that both side edge portions are configured to bend preferentially to the top sheet side.

  Although there is no restriction | limiting in particular about the specific structure of a pair of bending part, For example, (1) The space | gap part in which the space | gap was formed in the absorber, (2) The compression part by which the absorber was compression processed, (3) Absorption The low basic weight part by which the body was formed in low basic weight, etc. can be mentioned. When the diaper is worn, such a pair of bent portions are bent at the side edge portions of the absorbent body preferentially, and at the crotch portion, the wall portion formed by the side edge portions at the crotch portion of the absorbent body, and the crotch portion of the absorbent body The space partitioned by the bottom part which consists of the center part in can be favorably formed.

  1A and 1B show an example in which the pair of bent portions 62a and 62b is formed of a gap portion in which a gap is formed in the absorber 22.

  In addition, the bending part which consists of a compression part mentioned above compresses the site | part (namely, boundary part of a both-sides edge part and a center part) equivalent to a bending part from the surface side of an absorber, and is a concave groove | channel on an absorber. The boundary portion is configured to be bent preferentially, and the bent portion formed of the low basis weight portion has a low basis weight corresponding to the bent portion of the absorbent body. The bending strength is reduced by the above-mentioned, and the boundary portion is configured to be bent preferentially.

  In addition, the boundary part such as the gap part and the compression part constituting such a bent part may be formed with a certain width from the surface of the absorber to the back surface, for example, the surface of the absorber. For example, it may be formed in a V shape or the like whose width gradually decreases from the back surface to the back surface. By configuring in this way, both side edge portions in the crotch part of the absorber can be prevented from being bent in a direction other than the top sheet side (specifically, the back sheet side), and the space in the diaper crotch part is improved. Can be formed.

  In addition, both side edge portions in the crotch part of the absorbent body are preferentially folded toward the top sheet side by the contraction force of the pair of folding auxiliary elastic members arranged along the both side edges of the absorbent body, and once folded. After that, since the bent state is maintained by the bending assisting elastic member, the shape can be sufficiently maintained against the movement of the leg and the change of the posture of the wearer.

  In addition, there is no restriction | limiting in particular about the shape of a pair of said bending part, ie, the shape of the boundary part of the both-sides edge part to be bent, and the center part used as the bottom part of space. For example, in the disposable diaper 1A shown in FIG. 1A, a linear bent portion along the longitudinal direction of the absorbent body is formed in each of the left and right regions with respect to the central axis of the diaper in the longitudinal direction of the absorbent body. Although the example is shown, like the disposable diaper 1B shown in FIG. 2, it may be formed curvilinearly along the curve of the leg periphery opening part of a diaper, for example.

  Here, FIG. 2 is a figure which shows other embodiment of the disposable diaper of this invention, and is a schematic top view which shows the state which expand | deployed the disposable diaper and was seen from the top sheet side. In addition, about the thing comprised similarly to each element of 1 A of disposable diapers shown to FIG. 1A, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Moreover, in the disposable diaper of this invention, it is preferable that a pair of bending part is formed in the left-right symmetry of the width direction of an absorber along the longitudinal direction of an absorber. By comprising in this way, the space of a shape symmetrical with respect to a wearer can be formed in a wearer's crotch part, and while leaking from a crotch part is prevented effectively, the wearing feeling of a diaper Can be improved.

  In the disposable diaper of the present invention, as shown in FIG. 1A, the distance A between the pair of bent portions 62a and 62b in the width direction of the absorber 22, and one side edge (for example, side edge) of the absorber 22 It is preferable that the distance B from 22a) to one bent portion (for example, the bent portion 62a) formed on one side edge satisfies the relationship of the following formula (1).

  0.2B ≦ A ≦ 2B (1)

  By comprising in this way, the space divided by the wall part which consists of the both-sides edge part of an absorber, and the bottom part which consists of the center part of an absorber is formed in the crotch part at the time of diaper wear. Become. In addition, when the distance A is less than 0.2B, the width of the bottom portion formed of the center portion becomes too small, and the amount of absorption in the crotch cannot be sufficiently secured, and the wearing feeling of the diaper is deteriorated. There is a fear. On the other hand, if the distance A is greater than 2B, the height (depth) of the space at the crotch becomes insufficient, and the crotch part of the wearer, particularly the wearer's genital area easily comes into contact with the top sheet, Skin troubles such as rashes may occur.

  In the disposable diaper of the present invention, the distance A between the pair of bent portions and the distance B from one side edge of the absorber to the one bent portion formed on the one side edge side are as follows: It is more preferable that the relationship of the formula (2) is satisfied.

  B ≦ A ≦ 2B (2)

  Moreover, there is no restriction | limiting in particular about the length in the diaper longitudinal direction of this pair of bending part, However, It is preferable to form in the crotch part of a diaper at least. The pair of bent portions includes the crotch portion of the diaper and is in the range of 15 to 70% of the vertical length of the disposable diaper (that is, the length from one end to the other end in the longitudinal direction of the diaper). Preferably, it is formed in the range of 20 to 60%, more preferably in the range of 30 to 50%. For example, if the length of each of the pair of bent portions is less than 15% of the vertical length of the disposable diaper, the space formed by the pair of bent portions becomes narrow, and it may be difficult to ensure sufficient absorption. is there. On the other hand, if it exceeds 70% of the vertical length of the disposable diaper, the length of the diaper in the front-rear direction is too long, and the fit around the abdomen may be lowered.

  Further, in the disposable diaper of the present invention, for example, as shown in FIGS. 1A to 1C, a pair of legs around the pair of legs that are arranged on the outer side in the width direction of the absorbent body 22 than the pair of folding auxiliary elastic members 64 a and 64 b. It is preferable to further include a material 40. By further including such a pair of leg-surrounding elastic members 40, it becomes difficult for gaps to be formed around the legs by the leg-surrounding elastic members 40, and urine leakage from the leg-surrounding openings can be effectively prevented. In addition to the above effect, the pair of folding auxiliary elastic members 64a and 64b and the pair of leg elastic members 40 can keep the shape of the crotch space 60 formed by the bent portions 62a and 62b good. It is possible to make it difficult for leakage from the crotch part 4 to occur over a long period of time. In addition, the specific structure of the leg periphery elastic member will be described later.

  Moreover, in the disposable diaper of this invention, a pair of bending parts 62a and 62b (Hereinafter, it may be called "1st bending parts 62a and 62b.") Like the disposable diaper 1C shown to FIG. 3A and FIG. 3B, for example. One or more second bent portions 66 may be further formed between them. In such a disposable diaper 1C, as shown in FIG. 3C, both side edge portions 52a and 52b of the absorbent body 22 are bent to the top sheet 18 side by the first bent portions 62a and 62b, and the central portion 54 of the absorbent body 22 is provided. Is further bent by the second bent portion 66.

  By comprising in this way, when the absorber of a crotch part is compressed with both legs, an absorber can be bent in the fixed position of a center part, a shape is stabilized and it gives a wearer a discomfort There is no.

  3A and 3B, the first bent portions 62a and 62b are disposed between the first bent portions 62a and 62b (that is, a pair of bent portions) formed linearly along the longitudinal direction of the absorber 22. The example when the linear 2nd bending part 66 parallel to is formed is shown. Here, FIG. 3A is a figure which shows other embodiment of the disposable diaper of this invention, and is a schematic top view which expand | deploys a disposable diaper and shows the state seen from the top sheet side. 3B is a schematic cross-sectional view showing a YY ′ cross section of the disposable diaper shown in FIG. 3A, and FIG. 3C is a diagram showing a pair of bent portions of the disposable diaper shown in FIG. It is a schematic sectional drawing which shows the state bent. In addition, about the thing comprised similarly to each element of 1 A of disposable diapers shown to FIG. 1A, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  There is no restriction | limiting in particular about the shape of the 2nd bending part mentioned above, It is preferable that it is comprised similarly to a pair of 1st bending part. Moreover, it is preferable that the 2nd bending part is formed along the longitudinal direction of an absorber, and it is still more preferable that it is provided in the range of 1-5 along the longitudinal direction of an absorber.

[2-2] Bending auxiliary elastic material:
The folding auxiliary elastic material is an elastic material that is disposed along both side edges of the absorber at least on both side edges of the absorber in the crotch.

  By arranging such a folding assisting elastic material, when the diaper is worn, the side edges of the absorber are preferentially the top sheet with the pair of folded parts as the boundary due to the shrinkage force of the folding assisting elastic material. It can bend to the side, and a space having both side edge portions of the absorber as wall portions can be favorably formed in the crotch portion of the absorber.

  This bending auxiliary elastic material can be formed using, for example, the same material as the leg-around elastic material described later. For example, the bending auxiliary elastic material is made of thread rubber, flat rubber, or the like.

  This folding auxiliary elastic member is disposed in the vicinity of both side edges outside the absorber, and is preferably disposed at a position 3 to 10 mm away from both side edges of the absorber. When the distance between the folding auxiliary elastic material and the side edge of the absorbent body is less than 3 mm, the side edges of the absorbent body may be difficult to stand up due to the rigidity of the absorbent body. Moreover, when the distance between the bending assisting elastic member and the side edge of the absorber exceeds 10 mm, the force for raising both side edge portions of the absorber may be weakened.

  The folding auxiliary elastic material is preferably fixed in an extended state in order to exert a sufficient elastic force. For example, in the case where the bending assisting elastic material is a flat rubber made of natural rubber or a rubber thread made of an elastic thread of synthetic rubber, it is preferably fixed in a stretched state of 120 to 400%, and a stretched state of 200 to 300%. It is more preferable to fix with. By fixing in the extended state in such a range, the shape of the space formed in the crotch portion can be satisfactorily maintained when the diaper is worn.

[3] Other components of disposable diapers:
As shown in FIGS. 1A to 1C, the disposable diaper of the present invention is configured so that at least part of the disposable diaper is made of a liquid-permeable material in addition to the absorber 22 described so far and covers the surface of the absorber 22. The top sheet 18 that is disposed and the back sheet 20 that is made of a liquid-impermeable material and is disposed so as to cover the back surface of the absorber 22 are provided.

[3-1] Top sheet:
Since the top sheet needs to allow the wearer's urine or the like to pass therethrough, at least a part (all or a part) of the top sheet is made of a liquid-permeable material.

  Examples of the “liquid permeable material” include woven fabric, non-woven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As the “nonwoven fabric”, a nonwoven fabric produced by a manufacturing method such as air-through (card hot air) or card embossing can be suitably used. The “hydrophilic treatment” can be performed by applying, spraying, impregnating, etc. a surfactant.

  The top sheet is preferably “at least partly”, more specifically, when the top sheet is viewed in plan, at least the vicinity of the surface of the absorber is made of a liquid-permeable material.

  In addition, the sheet | seat located in the skin side of the wearer of a disposable diaper does not need to be comprised by the top sheet | seat all. That is, the sheet in contact with the wearer's skin may be constituted by a plurality of sheets including the top sheet, and the top sheet and other sheets may be joined together in the surface direction of the sheet.

  For example, a disposable diaper 1A shown in FIGS. 1A to 1C is a tape-type disposable diaper. A top sheet 18 made of a liquid-permeable material is disposed at the center in the width direction of the diaper, and a liquid is disposed on a side flap portion of the diaper. This is an example in which a side sheet 19 made of a breathable water-repellent material exhibiting resistance to permeation of water is disposed. The ventilated water-repellent sheet may be a non-woven fabric produced by a method such as card embossing or spunbond, but a non-woven fabric sheet such as SMS or SMMS having a high waterproof property is more preferable.

[3-2] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface located in the side far from a wearer's skin at the time of mounting | wearing of a diaper) may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the diaper.

  There is no restriction | limiting in particular about the arrangement position of a back seat | sheet. From the viewpoint of preventing leakage of urine absorbed by the absorber, it is preferable that a back sheet is disposed at least in a portion where the absorber exists.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so that the inside of the diaper can be prevented from being steamed There is.

  A cover sheet may be bonded to the outer surface side of the back sheet. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[3-3] Solid gathering:
The disposable diaper of the present invention may include a three-dimensional gather in order to prevent side leakage of urine excreted by the wearer. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather serves as a breakwater, and leakage from a leg-diameter opening or the like (so-called “lateral leakage”) can be effectively prevented.

  The structure of a three-dimensional gather can employ | adopt the structure used for the conventional disposable diaper and other absorbent articles. For example, as in the disposable diaper 1D shown in FIG. 4, an elastic material (three-dimensional gather elastic material 36 (36a, 36b) is sandwiched and fixed between layers of the water-repellent sheet 32, and the gather force is generated by the contraction force of the three-dimensional gather elastic material 36. What formed (襞) etc. can be used suitably.In these examples, the three-dimensional gather stretchable material 36 is pinched | interposed and fixed to the folding | turning part of the water-repellent sheet 32.

  Here, FIG. 4 is a figure which shows other embodiment of the disposable diaper of this invention, and is a schematic top view which expand | deploys a disposable diaper and shows the state seen from the top sheet side. In addition, about the thing comprised similarly to each element of 1 A of disposable diapers shown to FIG. 1A, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The three-dimensional gather may be separately provided with a water-repellent sheet for three-dimensional gather as described above, or may be formed by a part of the sheet material constituting the diaper. For example, the disposable diaper 1 </ b> D shown in FIG. 4 is an example in which the three-dimensional gathers 26 a and 26 b are formed by a part of the water-repellent sheet 32 that constitutes the side sheet 19. The water-repellent sheet may be a nonwoven fabric produced by a production method such as card embossing or spunbonding, but a nonwoven fabric sheet such as SMS or SMMS having a high waterproof property is more preferable.

[3-4] Fastening tape:
As shown in FIG. 1A, the disposable diaper of the present invention is a stopper for fixing the front body 2 and the back body 6 arranged so as to extend from the left and right side edges 6a, 6b of the back body 6. A receiving tape 11 may be provided. That is, the disposable diaper of the present invention includes a so-called tape-type disposable diaper.

  The fastening member of the fastening tape may be an adhesive fastener that is fixed by an adhesive, but a mechanical fastener (planar fastener) that is fixed by mechanical coupling is preferably used. In addition to high fastening force, the mechanical fastener has an advantage that the fastening force does not decrease even when the detachment is performed a plurality of times.

  For example, a disposable diaper 1A shown in FIG. 1A is an example in which a mechanical fastener 46 is used as a fastening member. A hook material 46 a is attached near the tip of the fastening tape 11, while a front patch 13 made of a loop material 46 b is attached to the front body 2, and the fastening tape 11 is attached to the front patch 13. It is comprised so that it can stop.

  The number of fastening tapes is not particularly limited, and an appropriate number of fastening tapes may be attached according to the dimensions of the wearer's body shape (specifically, around the waist, around the legs, etc.). In general, a pair of disposable diapers for infants (one each on the left and right) is attached, and a pair of disposable diapers for adults (two on the left and two on the left) are attached.

[3-5] Various elastic materials:
In the disposable diaper of the present invention, it is preferable to arrange an elastic material around the legs and arrange an elastic material around the waist.

  The leg circumference elastic material is an elastic material arranged along the leg circumference opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it is difficult to form a gap around the leg, and urine leakage from the opening around the leg can be effectively prevented.

  The leg elastic material is made of thread rubber, flat rubber or the like. And it is preferable that the leg periphery elastic material is arrange | positioned in the part outside the standing line of a three-dimensional gather. With such a configuration, it is possible to improve the wearing feeling and wearing feeling of the crotch part while ensuring a sufficient leakage preventing effect of the three-dimensional gather.

  The waist elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist and prevents urine leakage from around the waist. In addition, the fit of the diaper to the wearer is improved, and the diaper is prevented from falling down.

  A disposable diaper 1 </ b> A shown in FIG. 1A is an example in which a band-like waist elastic member 42 is disposed along the edge of the back body 6 of the diaper. The belt-like waist elastic member 42 is made of an elastic foam such as urethane foam. In the illustrated example, the waist elastic member 42 is disposed only on the back body (back side), but the waist elastic material may be disposed on the front body (abdominal side).

  For these stretchable materials, after considering the degree of shrinkage of gathers, etc., the constituent material, the elongation rate of the material, the stretched state at the time of fixing, etc. may be determined.

  As an elastic material, the elastic material which has been used with the conventional disposable diaper can be used conveniently. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc. in addition to natural rubber flat rubber and synthetic rubber (urethane rubber, etc.) elastic thread. it can.

  The stretchable material is preferably fixed in the stretched state in order to exert a sufficient stretch force. For example, when the elastic material is a flat rubber made of natural rubber or a thread rubber made of an elastic thread of synthetic rubber, it is preferably fixed in an extended state of 120 to 400%, and fixed in an extended state of 200 to 300%. More preferably. By fixing in the extended state in such a range, it is possible to apply a sufficient expansion / contraction force without applying an excessive tightening force to the wearer.

  The stretchable material as described above is fixed to other constituent members of the diaper by an adhesive or other means. The fixing method may be, for example, adhesion using a hot melt adhesive or other highly fluid adhesive, or may be welding by heat such as heat sealing or ultrasonic waves.

[3-6] Application target:
In addition, the disposable diaper of this invention is applicable also to a pants-type disposable diaper besides the tape type disposable diaper which was already demonstrated.

  The “pants-type disposable diaper” is a pants-type configuration in which one waist opening and a pair of leg openings are formed by joining corresponding side edges of the front and back bodies together. It is a disposable diaper. In particular, a form in which the absorbent main body in which the absorbent body is encapsulated is fixed to the inside of a pants-type exterior sheet having one waist opening and a pair of leg openings (“2” is often used. Called "Piece type").

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. However, the disposable diaper of this invention includes all the disposable diapers provided with the invention specific matter, and is not limited to the following examples.

[Example 1]
As the disposable diaper of Example 1, a tape-type disposable diaper was produced. The specific structure was the structure of the disposable diaper 1A shown in FIGS. 1A to 1C. This disposable diaper 1A is an L size for infants, and the length in the front-rear direction is 485 mm, and the width of the back body 6 (the length between the side edges 6a and 6b) is 325 mm.

  As an absorber, what mixed 150 mass parts of SAPs with 100 mass parts of pulp and wrapped with tissue was used. This absorbent body was formed into a rectangular shape having a length in the front-rear direction (length in the longitudinal direction of the diaper) of 400 mm and a length in the width direction of 120 mm, and further provided with a pair of bent portions. The pair of bent portions were provided at a position of 5 mm in width, 200 mm in length, and 140 mm from the back end so that the distance between the pair of bent portions was 50 mm.

  A pair of folding elastic materials were each placed at a position 5 mm outside the edges on both sides of the absorbent body with a polyurethane thread rubber (620 dtex) at a stretch rate of 250% over a length of 200 mm.

[Example 2]
As the disposable diaper of Example 2, a tape-type disposable diaper was produced. The specific structure was the structure of the disposable diaper 1C shown in FIG. 3A. This disposable diaper 1C is of an L size for infants, and has a length in the front-rear direction of 485 mm and a width of the back body 6 (a length between the side edges 6a and 6b) of 325 mm.

  In the disposable diaper of Example 2, it is comprised similarly to the disposable diaper of Example 1 except having formed the 2nd bending part of the same length as a 1st bending part in the center part of a pair of 1st bending part. ing.

  In the disposable diapers of Examples 1 and 2, when the diaper is worn, the both side edge portions of the absorbent body are bent toward the top sheet side by the folded portion of the absorbent body, and the both side edge portions of the absorbent body are formed at the crotch lower part of the diaper. A space defined by the wall portion and the bottom portion formed of the central portion in the crotch portion of the absorbent body was formed. In addition, the shape of the side edges of the folded absorbent body is maintained by the expansion and contraction force of the bending auxiliary elastic material, and the shape of the space is maintained with respect to the movement of the leg and the change of the posture of the wearer. It was something that could be done.

  The disposable diaper of this invention can be utilized for the disposable diaper for adults, such as an elderly person and a disabled person for infants or those who require nursing care.

It is a figure which shows one Embodiment of the disposable diaper of this invention, and is a schematic top view which shows the state which expand | deployed the disposable diaper and was seen from the top sheet side. It is a schematic sectional drawing which shows the X-X 'cross section of the disposable diaper shown to FIG. 1A. It is a schematic sectional drawing which shows the state by which the both-sides edge part of the absorber was bent by a pair of bending part of the disposable diaper shown to FIG. 1B. It is a figure which shows other embodiment of the disposable diaper of this invention, and is a schematic top view which shows the state which expand | deployed the disposable diaper and was seen from the top sheet side. It is a figure which shows other embodiment of the disposable diaper of this invention, and is a schematic top view which shows the state which expand | deployed the disposable diaper and was seen from the top sheet side. It is a schematic sectional drawing which shows the Y-Y 'cross section of the disposable diaper shown to FIG. 3A. It is a schematic sectional drawing which shows the state where the both-sides edge part of the absorber was bent by a pair of bending part of the disposable diaper shown to FIG. 3B. It is a figure which shows other embodiment of the disposable diaper of this invention, and is a schematic top view which shows the state which expand | deployed the disposable diaper and was seen from the top sheet side.

Explanation of symbols

1A, 1B, 1C: disposable diapers, 2: front body, 4: crotch, 6: back body, 6a, 6b: side edges (side edges of back body), 11: fastening tape, 13: front patch, 18 : Top sheet, 19: Side sheet, 20: Back sheet, 22: Absorber, 22a, 22b: Side edges (side edges of the absorber), 26, 26a, 26b: Solid gathers, 32, 32a, 32b: Water repellency Sheet, 36, 36a, 36b: Three-dimensional gather elastic material, 40: Elastic material around leg, 42: Elastic material around waist, 46: Mechanical fastener, 46a: Hook material, 46b: Loop material, 52, 52a, 52b: Side edge Portions (side edge portions of the absorber), 53: wall portion, 54: center portion (center portion of the absorber), 55: bottom portion, 60: space, 62, 62a, 62b: bent portion, 64, 64a, 64b: Folding Auxiliary elastic member, 66: second bent portion.

Claims (6)

Consists of each part of the front body, the crotch and the back body,
An absorber, at least partly made of a liquid-permeable material, a top sheet arranged to cover the surface of the absorber, and a liquid-impermeable material so as to cover the back surface of the absorber A backsheet disposed,
The absorber is configured such that at least both side edge portions of the absorber in the crotch portion can be bent toward the top sheet side, and at least the crotch portion includes a wall portion including the both side edge portions, and the absorption portion. A pair of bent portions are formed to form a space defined by a bottom portion formed of a central portion in the crotch portion of the body; and
A disposable diaper in which a pair of folding assisting elastic members for assisting folding is disposed along both side edges of the absorber at least on both side edges of the absorber in the crotch part.   2. The disposable diaper according to claim 1, wherein the absorbent body has the pair of bent portions formed symmetrically in the width direction of the absorbent body along the longitudinal direction of the absorbent body.   The pair of bent portions are void portions in which voids are formed in the absorber, or are compressed portions in which the absorber is compressed, or low in which the absorber is formed with a low basis weight. It is a basic weight part, The disposable diaper of Claim 1 or 2. A distance A between the pair of bent portions in the width direction of the absorber, and a distance B from one side edge of the absorber to the one bent portion formed on the one side edge side, The disposable diaper as described in any one of Claims 1-3 which satisfies the relationship of following formula (1).
0.2B ≦ A ≦ 2B (1)   The disposable diaper as described in any one of Claims 1-4 which further has a pair of leg periphery elastic material arrange | positioned rather than the pair of bending auxiliary elastic materials in the width direction outer side of the absorber.   The disposable diaper according to any one of claims 1 to 5, wherein the absorber is further formed with one or more second bent portions between the pair of bent portions.

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