JP4881910B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper that includes an absorbent body, a top sheet, and a back sheet, and a skin contact sheet that is in contact with a wearer's skin on the surface side (upper side) of the top sheet.

  In recent years, as a diaper for infants or the elderly or disabled, an absorbent body, a top sheet at least partially made of a liquid-permeable material, and arranged to cover the surface of the absorbent body, and liquid-impermeable Disposable diapers comprising a back sheet that is made of a functional material and is disposed so as to cover the back surface of the absorber are widely used. Such disposable diapers are used so that the surface of the top sheet contacts the wearer's skin, and the urine excreted by the wearer permeates the top sheet and is absorbed and held by the absorbent body. Moreover, the leakage of the excrement to the outside of the diaper is prevented by the back sheet excellent in leakage prevention.

  Recently, a disposable diaper in which another sheet body (hereinafter referred to as “skin contact sheet”) is arranged on the surface side (upper side) of the top sheet has also been proposed (Patent Documents 1 and 2). reference). The skin contact sheet is formed with an opening for stool and an opening for urine, and the stool excreted by the wearer through these openings is configured to fall on the top sheet.

  The skin contact sheet functions as a shielding layer between the wearer's skin and the top sheet while separating the wearer's skin and the top sheet. Therefore, even if stool remains on the top sheet, it is possible to expect the effect of greatly reducing the chance that the stool and the skin of the wearer are in direct contact.

  By the way, the skin contact sheet is referred to as an elastic material (hereinafter referred to as “opening elastic material”) along the outer edge of the stool opening or the urine opening for the purpose of bringing the skin contact sheet into close contact with the wearer's skin. .) Has been done. However, since the gathers formed by the opening stretchable material itself and the shrinkage force of the opening stretchable material come into contact with the wearer's skin, there is a risk of causing pain in the contact portion or causing skin troubles. .

  In view of this, the present applicant has proposed a disposable diaper in which a non-shrinkable region where a contractile force does not act is formed in a region between the feces opening and the urine opening of the skin contact sheet (see Patent Document 3). ).

  Patent Document 3 discloses that a disposable diaper 100A shown in FIG. 2 has an opening in a region between the stool opening 26b and the urine opening 26a that is in contact with the most sensitive perineum in the wearer's skin. An example in which a non-shrinkable region is formed by not disposing the partial stretchable material 28 is described.

  Further, in Patent Document 3, as in the disposable diaper 100B shown in FIG. 3, the pair of opening elastic members 28 are arranged without intersecting the left and right sides of the stool opening 26b and the urine opening 26a. There is also described an example in which a non-shrinkable region is formed by arranging and fixing the curved portion toward the center of the skin contact sheet 24 in the region between the stool opening 26b and the urine opening 26a.

  In such disposable diapers, the shrinkage force caused by the opening stretchable material does not act on the region in contact with the wearer's perineum, so the opening stretchable material or the gathers formed thereby are worn by the wearer's perineum It can be expected to prevent the occurrence of pain and skin trouble by touching the skin.

Utility Model Registration No. 2559050 (FIG. 2) Japanese Patent Laying-Open No. 2002-11044 (FIG. 4) JP 2007-105302 A (FIGS. 4 to 7)

  By the way, in the disposable diaper 100A shown in FIG. 2, a) the four opening stretchable members 28 are individually arranged and fixed, or b) the two opening stretchable members are attached to the stool opening 26b and the urine opening. After arranging so that it may cross | intersect in the area | region between 26a, an opening part elastic material is cut | disconnected after that and the snap back is manufactured in the crossing vicinity vicinity. Therefore, it is not always easy to manufacture, and a problem to be solved in terms of productivity remains.

  Further, the disposable diaper 100B shown in FIG. 3 is applied to a region between the stool opening 26b and the urine opening 26a when the opening stretchable member is fixed with an adhesive such as a hot melt adhesive. However, there is a problem that the air permeability is impaired by the adhesive, or the cured adhesive gives a feeling of foreign matter, and the wearing feeling is lowered. That is, the skin contact sheet is still not fully satisfactory in terms of air permeability and wearing feeling at the crotch portion, and remains a problem to be solved.

  The present invention has been made to solve such problems of the prior art, and the opening stretchable material and the gathers formed thereby contact the wearer's perineum and cause pain. In addition to being able to prevent the occurrence of skin troubles, a disposable diaper that is easy to manufacture and excellent in breathability and wearing feeling in the crotch portion of the skin contact sheet is provided.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventors have arranged a pair of opening stretchable materials without crossing the skin contact sheet, and the In the region between the opening and the urine opening, the above-mentioned problem is solved by fixing the opening elastic member to the skin contact sheet only in the region before and after the opening elastic member. The present invention has been completed. Specifically, the following disposable diapers are provided by the present invention.

[1] A top sheet that is composed of parts of a front body, a crotch part, and a back body, is composed of an absorbent body, at least a part is made of a liquid-permeable material, and covers the surface of the absorbent body; A back sheet made of an impermeable material and arranged to cover the back surface of the absorbent body, and a water-repellent sheet, and a stool opening and a urine opening are formed on the surface side of the top sheet A skin contact sheet disposed, and the skin contact sheet includes a pair of opening elastic members disposed along the outer edge of the stool opening and the outer edge of the urine opening. The opening elastic members of the skin are arranged continuously from the front end to the rear end of the skin contact sheet without crossing each other, and fixed to the skin contact sheet And a non-fixed part that is not fixed to the skin contact sheet, and at least a part of the non-fixed part in a region between the openings between the stool opening and the urine opening Disposable diaper where is placed.

[2] The fixing portions of the pair of opening elastic members are curved toward the center in the width direction of the skin contact sheet along the outer edge of the stool opening and the outer edge of the urine opening. The disposable diaper according to [1], which is arranged.

  The disposable diaper of the present invention is capable of preventing a situation in which an opening stretchable material or a gather formed thereby contacts a wearer's perineum and causes pain or skin trouble. In addition, it is easy to manufacture and has excellent breathability and wearing feeling in the crotch portion of the skin contact sheet.

  Hereinafter, the best mode for carrying out the disposable diaper of the present invention will be specifically described by taking a two-piece type pants-type disposable diaper as an example. However, the present invention broadly encompasses disposable diapers having the invention specific items, and is not limited to the following embodiments. In addition, about FIG. 1D, for the convenience of drawing, it drawn in the form which left the leg elastic | stretch around.

[1] Definitions etc .:
The “pants-type disposable diaper” refers to the corresponding side edge portions (side edge portions 2a, 6a, side edge portions 2b, 6b) of the front body 2 and the back body 6 as in the disposable diaper 1A shown in FIG. 1C. By joining, the joining part 8, the one waist periphery opening part 10, and a pair of leg periphery opening parts 12a and 12b shall be formed, and it shall mean the diaper comprised beforehand by the underpants type.

  The “two-piece type” means an absorbent main body 14 that functions to absorb and retain the excrement of the wearer (absorption / retention function), as in the disposable diaper 1A shown in FIG. 1A, and the wearer's body. It is composed of an exterior member 16 having a function of encapsulating (a mounting function), and means a diaper in which the absorbent main body 14 is disposed inside the exterior member 16.

  The “absorbent body” includes the absorbent body 22, the top sheet 18, and the back sheet 20 as constituent elements like the absorbent body 14 shown in FIG. 1D, and the absorbent body 22 includes the top sheet 18 and the back sheet 20. A member fixed in a state sandwiched between them and integrated in a pad shape is meant.

  As shown in FIG. 1A and FIG. 1C, the “front body” means a part that covers the abdomen side (front of the body) of the wearer when a diaper is worn on the wearer, and “crotch part” means to the wearer The part that covers the inseam of the wearer when wearing a diaper, “back body” means the part that covers the back side (back of the body) of the wearer when wearing a diaper. .

[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. 1D, and at least one part is liquid-permeable. A top sheet 18 made of a material and arranged to cover the surface of the absorber 22, a back sheet 20 made of a liquid-impermeable material and arranged to cover the back surface of the absorber 22, and water repellency It is a disposable diaper made of a sheet, having a stool opening 26b and a urine opening 26a, and a skin contact sheet 24 disposed on the surface side of the top sheet 18.

  The skin contact sheet 24 includes a pair of opening elastic members 28, 28 arranged along the outer edge of the stool opening 26 b and the outer edge of the urine opening 26 a, and the pair of opening elastic members 28. , 28 are arranged continuously from the front end 30 to the rear end 32 of the skin contact sheet 24 without crossing each other, and fixed portions 28a, 28c fixed to the skin contact sheet 24; A non-fixed portion 28b that is not fixed to the contact sheet 24, and at least a part of the non-fixed portion 28b is located in the inter-opening region 34 between the stool opening 26b and the urine opening 26a. It is what is arranged.

  In this way, the opening elastic members are arranged without crossing each other, and in the region between the openings of the skin contact sheet, the non-fixed state is applied to the skin contact sheet. Even without this, the opening stretchable material and the gathers formed thereby do not come into contact with the particularly sensitive perineum of the wearer's skin. Therefore, it is possible to effectively prevent a situation in which the wearer feels pain in the portion or a skin trouble occurs.

  In addition, even when the opening stretchable material is fixed with an adhesive such as a hot melt adhesive, it is not necessary to apply an adhesive to the crotch portion of the skin contact sheet. Excellent in feeling and wear.

  Further, in manufacturing, as in the disposable diaper 100A shown in FIG. 2, a) four opening elastic members are individually arranged and fixed, and b) two opening elastic members are used for stool openings and urine. After arranging so as to intersect in the region between the openings, a complicated manufacturing process such as cutting the opening stretchable material in the vicinity of the intersection and then snapping back is not required. Further, as in the disposable diaper 100B shown in FIG. 3, the two opening elastic members are arranged in a narrow region between the stool opening and the urine opening so as to bend toward the center side of the skin contact sheet. It is not necessary to fix. Therefore, compared with the conventional disposable diaper, the manufacture is also easy.

[2-1] Opening stretchable material:
The opening elastic material applies tension to the skin contact sheet to prevent the skin contact sheet from slipping and falling to the top sheet, and the skin contact sheet urine opening and stool opening are pressed against the wearer's skin. It is a member to apply. Thereby, excrement can be reliably guided to the surface of the top sheet. Further, the opening stretchable material causes a force to bend the top sheet, the absorber, and the back sheet toward the lower side (the exterior member side) by contracting the skin contact sheet. Therefore, the skin contact sheet can be maintained in a floating state from the top sheet, and the skin contact sheet and the top sheet can be reliably separated from each other.

  In the disposable diaper of the present invention, like the disposable diaper 1A shown in FIG. 1A, the pair of opening stretchable members 28 are continuously continuous from the front end 30 to the rear end 32 of the skin contact sheet 24 without crossing each other. Has been placed.

  As described above, the skin contact sheet 24 can be continuously manufactured by continuously arranging the pair of opening stretchable members 28 from the front end 30 toward the rear end 32. Further, by arranging the opening elastic members 28 without crossing each other, the opening elastic members can be arranged more easily than when the opening elastic members cross between the urine opening and the stool opening. Can contribute to improving the productivity of skin contact sheets.

  Moreover, the disposable diaper of this invention is the fixed part 28a, 28c by which the opening-part expansion-contraction material 28 was fixed with respect to the skin contact sheet 24 like the disposable diaper shown to FIG. 1A and FIG. 1B, and a skin contact sheet. 24, and a non-fixed portion 28b that is not fixed to 24, and at least a part of the non-fixed portion 28b is disposed in the inter-opening region 34 between the stool opening 26b and the urine opening 26a. Has been.

  The opening stretchable material is disposed and fixed in a stretched state with a stretch rate of 120 to 400% in order to impart stretch force (shrinkage force) to the skin contact sheet. Accordingly, with the above configuration, as shown in FIGS. 1A and 1B, the non-fixed portion 28b of the opening stretchable member 28 is disposed on a straight line connecting the end portions of the fixed portions 28a and 28c with the shortest distance. . For this reason, the opening expansion-contraction material 28 is not arrange | positioned in the part contact | abutted to a wearer's perineum part. Further, the non-fixed portion 28 b of the opening stretchable material 28 is not fixed to the skin contact sheet 24. Therefore, in this portion, the opening stretchable material 28 contracts without being constrained by the skin contact sheet 24, and therefore, it is difficult to form gathers. With such a configuration, it is possible to prevent a situation in which the opening stretchable material and the gathers formed thereby come into contact with the perineum of the wearer and cause pain or skin trouble.

  In the disposable diaper 1A shown in FIG. 1B, the skin contact sheet 24 is divided into three regions, a first region 50 on the front end 30 side, a second region 52 in the center, and a third region 54 on the rear end 32 side. This is realized by an extremely simple method in which the adhesive is applied only to the 50 and third regions 54 and the adhesive is not applied to the second region 52.

  That is, in the disposable diaper 1A shown in FIG. 1B, the portions of the opening stretchable member 28 that are disposed in the first region 50 and the third region 54 are fixed to the skin contact sheet 24 to form the fixing portions 28a and 28c. Yes. On the other hand, the portion of the opening stretchable member 28 that is disposed in the second region 52 is not fixed to the skin contact sheet 24 and constitutes a non-fixed portion 28b. According to such a method, the air permeability and wearing feeling at the crotch portion of the skin contact sheet 24 can be improved.

  The non-fixed part should just be arrange | positioned in the at least one part of the area | region between opening parts between the stool opening part and the urine opening part, and should be arrange | positioned in the part which a wearer's perineum part can contact | abut Is preferred. For example, the disposable diaper 1A shown in FIG. 1B is an example in which the non-fixed portion 28b is disposed longer than the front-rear length of the inter-opening region 34, and the non-fixed portion 28b is disposed in the entire inter-opening region 34. is there. However, the non-fixed portion may be disposed shorter than the front-rear length of the region between the openings, or may be disposed so as to coincide with the front-rear length of the region between the openings. In general, the front-rear length of the inter-opening region is about 10 to 60 mm.

  In addition, the disposable diaper of the present invention is similar to the disposable diaper 1A shown in FIGS. 1A and 1B, in which the fixing portions 28a of the pair of opening elastic members 28 are provided on the outer edge of the stool opening 26b and the urine opening 26a. It is preferable that the skin contact sheet 24 is disposed so as to bend toward the center in the width direction along the outer edge.

  If the non-fixed part is merely formed, the skin contact sheet, particularly the area between the openings, is difficult to adhere to the skin of the wearer, and urine and feces are difficult to pass through the urine opening and the stool opening. There is a fear. In the disposable diaper 1A shown in FIG. 1B, in the first region 50, the fixing portion 28a of the opening elastic member 28 is curved toward the center in the width direction of the skin contact sheet 24 along the outer edge of the urine opening 26a. In the third region 54, the fixing portion 28c of the opening elastic member 28 is arranged so as to bend toward the center in the width direction of the skin contact sheet 24 along the outer edge of the stool opening 26b. ing.

  At this time, the distance between the non-fixed portions 28b of the pair of opening stretchable members 28 is preferably 20 to 120 mm, and more preferably 30 to 80 mm. By setting it to 20 mm or more, it is possible to effectively prevent pain and skin trouble in the perineal part of the wearer. On the other hand, by setting it as 120 mm or less, the area 34 between opening parts can be contact | abutted to a wearer's skin, and feces and urine can pass through the skin contact sheet 24 reliably.

  As the opening stretchable material, stretchable materials that have been used in conventional disposable diapers can be suitably used. Specifically, thread rubber made of an elastic material such as natural rubber or synthetic rubber (urethane rubber, etc.), flat rubber, etc., stretchable net, stretchable film, stretchable foam (urethane foam, etc.) and the like can be mentioned.

  The opening stretchable material is fixed to the skin contact sheet 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. Among them, like the disposable diaper 1A shown in FIG. 1D, it is preferable that the opening stretchable material 28 is sandwiched between two sheet materials (upper sheet 24a and liner sheet 24b) and fixed with an adhesive or the like. .

  The opening stretchable material is preferably fixed in an expanded state to form a gather on the sheet material in order to exert sufficient stretching force on the skin contact sheet. For example, when the opening stretchable material is natural rubber or synthetic rubber, it is preferably fixed in a stretched state of 120 to 400%, and more preferably fixed in a stretched state of 200 to 300%. When the material is natural rubber, it is preferably stretched and fixed to 150 to 300% as described above. By fixing in an extended state in such a range, a sufficient contracting force can be applied to the skin contact sheet, particularly the region other than the region between the openings.

  The opening stretchable material is disposed along the outer edge of the stool opening and the outer edge of the urine opening. “To be along” does not have to be completely enclosed, and it is sufficient if the outer edge (especially the side edge) of the opening portion is disposed to some extent. In the disposable diaper 1A shown in FIGS. 1A and 1B, the urine opening 26a is surrounded by the front end 30 side of the skin contact sheet 24, and the stool opening 26b is surrounded by the opening elastic member 28 at the rear end 32 side of the skin contact sheet 24. It is not done and it is in an open state. By carrying out like this, air permeability can also be ensured, making the urine opening 26a and the stool opening 26b contact | abut with respect to a wearer's skin.

[2-2] Skin contact sheet:
The disposable diaper of the present invention includes a skin contact sheet 24 made of a water-repellent sheet and disposed on the surface side of the top sheet 18 as in the disposable diaper 1A shown in FIGS. 1A and 1D.

By comprising a water-repellent sheet, a light touch (dryness) can be maintained even when worn for a long time. For example, a nonwoven fabric sheet having a good touch and having appropriate air permeability and moisture permeability can be suitably used. As a raw material of a nonwoven fabric sheet, what consists of resin, such as polyethylene, a polypropylene, polyester, can be mentioned. Breathability, moisture permeability which is measured in accordance with JIS Z 0208 (moisture permeability test method for dry packing material) is preferably in the range of ^{2000~10000 (g / m 2 / 24hr} ).

  As shown in FIG. 1A, the skin contact sheet 24 has a stool opening 26b through which stool passes and a urine opening 26a through which urine passes. With such a structure, the urine excreted by the wearer passes through the urine opening 26a, and the stool passes through the stool opening 26b and falls onto the top sheet.

  As long as the excrement passage opening 26 has a shape that allows the excrement to pass therethrough, the shape thereof is not particularly limited. For example, openings (holes) such as a circle, an ellipse, and a rhombus can be given. The urine opening 26a shown in FIG. 1A is formed in a substantially bullet shape, and the stool opening 26b is formed in a water droplet shape. By forming the stool opening 26b in the form of water droplets along the groin of the wearer, even if the wearer excretes stool while lying on his back, the stool surely passes through the stool opening 26b, and the top It falls on the sheet 18.

  As shown in FIG. 1D, the skin contact sheet is fixed by (1) a method of fixing the skin contact sheet 24 on the surface of the top sheet 18 (or the back sheet 20), and (2) when a three-dimensional gather is provided. And a method of fixing by sandwiching between the inner surface of the three-dimensional gather and the surface of the top sheet (or back sheet).

  In the disposable diaper of the present invention, it is preferable to provide a separation wall that divides the space between the skin contact sheet and the top sheet into a space communicating with the urine opening and a space communicating with the stool opening. .

  When urine and feces are mixed, ammonia is generated. This ammonia makes the environment alkaline, and the enzymes in the stool are strongly activated in an alkaline atmosphere. The weakened areas of the skin are inflamed by this enzyme and ammonia, causing diaper rash. Has been reported to occur (Kazuya Yamamoto, Dermatology 30, 949-956 (1998)). By providing the separation wall as described above, it becomes possible to absorb and hold the urine excreted by the wearer in a state separated from the stool, so that the urine and the stool are hardly mixed, and diaper rash is effectively prevented. can do. The separation wall can be composed of a water repellent sheet similar to the water repellent sheet.

[2-3] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  Examples of the absorbent material constituting the absorber include conventionally known absorbent materials usually used for disposable diapers and other absorbent articles, such as fluff pulp, super absorbent polymer (Super Absorbent Polymer; hereinafter referred to as “SAP”). And a hydrophilic sheet. It is possible to use wood pulp or non-wood pulp defibrated as fluff pulp, sodium polyacrylate as SAP, tissue, absorbent paper, hydrophilized nonwoven fabric as hydrophilic sheet preferable.

  These absorbent materials are usually used as a single-layer or multi-layer mat. Under the present circumstances, 1 type may be used independently among the said absorptive materials, and 2 or more types may be used together. Especially, what used together about 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be uniformly mixed in each mat of fluff pulp, or may be arranged in layers between the layers of the multilayer fluff pulp.

  The absorber needs to be interposed at least in part between the top sheet and the back sheet. Usually, the absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed is formed between the top sheet and the back sheet at the peripheral part of the absorber.

  It is preferable that the absorber is entirely wrapped with a hydrophilic sheet. Such a configuration has an advantage that SAP can be prevented from leaking from the absorber and shape stability can be imparted to the absorber.

  Although there is no restriction | limiting in particular about the shape of an absorber, The shape used in the conventional disposable diaper and other absorbent articles, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

[2-4] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the surface (surface located in a wearer's skin side at the time of mounting | wearing of a diaper) may be coat | covered. At least a part (all or a part) of the top sheet is made of a liquid-permeable material because the absorber disposed on the lower surface side needs to absorb the wearer's urine.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide (trade name: nylon), etc., which has been subjected to a hydrophilic treatment.

  The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials. For example, in the case of a tape-type diaper, a top sheet (center sheet) made of a liquid-permeable material is arranged at the center of the diaper, and a top sheet (side sheet) made of a water-repellent material at the side flap portion of the diaper. A form of arranging is often used.

[2-5] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface located in a wearer's clothing side 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.

  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.

  Note that a sheet material (cover sheet) may be bonded to the outer surface 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.

[2-6] Absorbent body:
In a two-piece type pants-type disposable diaper, the top sheet, the back sheet, and the absorbent body are configured as one member called an “absorbent body” that takes on the absorption and holding functions, and is manufactured separately from the exterior member. A disposable diaper is constituted by joining with. Like the sanitary napkin, this absorbent main body has a top sheet on the front side of the absorbent body and a back sheet on the back side. The absorbent body is interposed between the top sheet and the back sheet. It has a structured. For example, in the disposable diaper 1A shown in FIG. 1D, the absorbent body 22 is sandwiched between the top sheet 18 and the back sheet 20, and the periphery of the absorbent body 22 is sealed, whereby the top sheet 18 and the back sheet 20 are separated. It is the example which comprised the absorptive main body 14 of the structure where the absorber 22 was interposed in between.

  An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

[2-7] Exterior member:
The exterior member is a member having a mounting function for encapsulating the wearer's body, and specifically, is a sheet-like member that forms the front body, the crotch portion, and the back body.

  In the two-piece type pants-type disposable diaper, the absorbent main body serves exclusively for absorbing and holding the wearer's excrement, so that it is liquid-impermeable as a material constituting the exterior member. There is no need to use materials. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

  And in order to fix an exterior member in the state which pinched | interposed the elastic material etc. around the leg, it is often configured by bonding two or more nonwoven fabrics together. For example, in the disposable diaper 1A shown in FIGS. 1A, 1C, and 1D, the exterior member 16 is composed of two nonwoven fabric sheets (an inner sheet 16a and an outer sheet 16b), and the leg is stretched between the two nonwoven fabrics. This is an example in which the material 40, the waist elastic member 42, and the belly elastic member 44 are sandwiched and fixed.

[2-8] Various elastic materials:
In a pants-type disposable diaper, it is common to arrange an elastic material around the legs, arrange an elastic material around the waist, and more preferably arrange an elastic material around the abdomen.

  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 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.

  An abdominal circumference elastic material is an elastic material arrange | positioned in the part (namely, part equivalent to a wearer's abdominal circumference) between a waist circumference opening part and a leg circumference opening part. By arranging the elastic material around the abdomen, it is possible to form a highly elastic tammy gather around the abdomen of the wearer. This Tammy Gather, together with West Gather, can make the diaper fit and anti-slip effect even better.

  In the disposable diaper 1A shown in FIG. 1A and FIG. 1C, a plurality of leg-surrounding elastic members 40 are disposed on the periphery of the leg-surrounding openings 12a and 12b, and the waist-surrounding opening 10 is disposed on the periphery of the waist-surrounding opening 10. A plurality of waist elastic members 42 are disposed so as to surround 10, and a portion between the waist opening 10 and the leg openings 12 a and 12 b (that is, a portion corresponding to the wearer's abdomen). This is an example in which a plurality of belly stretchable members 44 are arranged so as to surround the wearer's belly.

  About these elastic materials, the structure similar to the opening part elastic material used for the skin contact sheet already described can be employ | adopted. Then, after considering the degree of gather contraction and the like, the constituent material, the elongation rate of the material, the stretched state at the time of fixing, etc. may be determined.

[2-9] Solid gather:
In order to prevent side leakage of urine excreted by the wearer, a three-dimensional gather may be provided. 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 a three-dimensional gather, urine is excreted on the skin contact sheet, and even if the urine spreads through the skin contact sheet, the three-dimensional gather becomes a breakwater, and from the opening around the leg of the diaper, etc. Leakage (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, it is possible to suitably use a material in which a stretchable material (a three-dimensional gathered stretchable material) is arranged on a part of the sheet material, and a gather is formed on the sheet material by the three-dimensional gathered stretchable material.

[3] Manufacturing method:
Hereinafter, an example of the method of manufacturing the disposable diaper of the present invention will be described with reference to an example of manufacturing the disposable diaper 1A (two-piece type pants-type disposable diaper) shown in FIGS. 1A to 1D.

[3-1] Production of absorbent main body:
An absorber 22 wrapped in a hydrophilic sheet is disposed on the upper surface of the back sheet 20, and a top sheet 18 is disposed on the upper surface. Next, the absorbent main body 14 is obtained by sealing the periphery of the absorbent body 22 so as to be sandwiched between the top sheet 18 and the back sheet 20.

[3-2] Production of skin contact sheet:
The pair of opening elastic members 28 are continuously arranged on the upper surface of the liner sheet 24b so as not to cross each other along the outer edge of the stool opening 26b and the outer edge of the urine opening 26a. At this time, as shown in FIG. 1B, in the liner sheet 24b, the adhesive is not applied to the second region 52 including the portion corresponding to the inter-opening region 34 of the skin contact sheet 24. The hot melt adhesive is applied only to the first region 50 and the third region 54). Thereafter, the upper sheet 24a is bonded to the upper surface of the liner sheet 24b. Thereby, the fixing | fixed part 28a, 28c of the opening part expansion material 28 and the non-fixing part 28b are formed.

  Next, the urine opening 26a and the stool opening 26b are formed in the liner sheet 24b and the upper sheet 24a that are bonded together. Thereby, the urine opening 26a and the stool opening 26b are formed, and the skin contact sheet 24 having a two-layer structure in which the opening stretchable material 28 is disposed and fixed along the outer edge thereof is obtained.

[3-3] Attaching the skin contact sheet to the absorbent main body:
A skin contact sheet 24 is bonded to the surface of the top sheet 18 constituting the absorbent main body 14.

[3-4] Production of exterior member:
First, two non-woven sheets serving as the exterior member 16 are prepared, and an elastic material 42 around the waist, an elastic material 44 around the waist, and an elastic material 40 around the legs are formed on the upper surface of one of the non-woven sheets (outer sheet 16b). Arrange and fix with adhesive. Then, another non-woven sheet (inner sheet 16a) is laminated and fixed on the upper surface, thereby expanding / contracting the waist elastic member 42, the belly elastic member 44 and the leg elastic member between the two nonwoven sheets. The exterior member 16 in which the material 40 is interposed is obtained.

[3-5] Manufacture of disposable diapers:
The absorbent main body 14 is disposed and fixed near the crotch part of the exterior member 16. Next, the absorbent body 14 is turned inside, and the front body 2 and the back body 6 are folded in two so that the front body 2 and the back body 6 are matched, and the front body 2 and the back body 6 are joined by means such as heat sealing to form the joint 8. By doing, the disposable diaper 1A shown to FIG. 1A-FIG. 1D can be manufactured.

  The series of steps as described above can be continuously performed by mechanical means. For example, by adopting a method / apparatus such as continuously feeding a long sheet material or stretchable material from a roller, it becomes possible to continuously manufacture disposable diapers, which contributes to an improvement in productivity.

[4] Application target of the present invention:
The application object of the disposable diaper of this invention is not restricted to the said 2 piece type underpants type disposable diaper, For example, it can apply also to a 1 piece type underpants type disposable diaper and a tape type diaper. That is, also in these disposable diapers, the effect of the disposable diaper of the present invention can be enjoyed by arranging the skin contact sheet having the structure already described.

  “One-piece type” includes a top sheet, a back sheet, and an absorber as in the case of the two-piece type. However, the absorber that performs absorption and holding functions is interposed between the top sheet and the back sheet. This means a diaper of a type that is (built-in) and configured integrally with a top sheet and / or a back sheet that has a mounting function.

  The “tape-type diaper” includes a top sheet, a back sheet, an absorber interposed in at least a part between the two sheets, and a tape fastener for wearing. It shall mean a disposable diaper that can fix the back and back parts to each other. “Tape-type diapers” also have “1-piece type” and “2-piece type” like pants-type disposable diapers, but the disposable diaper of the present invention is applicable to any type of tape-type diaper. .

  The disposable diaper of the present invention can be suitably used as a diaper for infants or for adults such as elderly people and persons with disabilities who need care. The disposable diaper of the present invention is such that the excreted stool is less likely to come into direct contact with the wearer's skin, and the opening stretchable material is in the region between the openings between the urine opening and the stool opening of the skin contact sheet. Since the contractile force is difficult to act, it can be particularly suitably used as a disposable diaper for infants with weak skin and many skin troubles.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows one Embodiment of the disposable diaper of this invention, is a figure which shows the state which expand | deployed the disposable diaper and was seen from the absorptive main body side of the diaper. It is a partially expanded view which shows one Embodiment of the disposable diaper of this invention, and is a figure which expands and shows the part of the skin contact sheet of the disposable diaper shown to FIG. 1A. It is a schematic perspective view which shows one Embodiment of the disposable diaper of this invention, and is a figure which shows the state which assembled the disposable diaper shown to FIG. 1A and was seen from the front. It is a schematic sectional view showing one embodiment of a disposable diaper of the present invention, and is a figure showing a section which cut a disposable diaper shown in Drawing 1A along a X-X 'line. It is a top view which shows one embodiment of the conventional disposable diaper, and is a figure which shows the state which expand | deployed the disposable diaper and was seen from the absorptive main body side of the diaper. It is a top view which shows another embodiment of the conventional disposable diaper, and is a figure which shows the state which expand | deployed the disposable diaper and was seen from the absorptive main body side of the diaper.

Explanation of symbols

1A, 100A, 100B: disposable diapers, 2: front body, 2a, 2b: side edge, 4: crotch, 6: back body, 6a, 6b: side edge, 8: joint, 10: opening around waist Part, 12, 12a, 12b: opening around leg, 14: absorbent main body, 16: exterior member, 16a: inner sheet, 16b: outer sheet, 18: top sheet, 20: back sheet, 22: absorber, 24 : Skin contact sheet, 24a: upper sheet, 24b: liner sheet, 26: opening, 26a: urine opening, 26b: stool opening, 28: opening stretchable material, 28a, 28c: fixing part, 28b: Non-fixed portion, 30: front end, 32: rear end, 34: region between openings, 40: elastic material around leg, 42: elastic material around waist, 44: elastic material around waist, 50: first region, 52: first 2 areas, 5 : The third region.

Claims (2)

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 back contact sheet, a water repellent sheet, a stool opening and a urine opening formed, and a skin contact sheet disposed on the surface side of the top sheet,
The skin contact sheet includes a pair of opening elastic members arranged along the outer edge of the stool opening and the outer edge of the urine opening,
The pair of opening elastic members are arranged continuously from the front end to the rear end of the skin contact sheet without crossing each other, and the fixing portion fixed to the skin contact sheet; and A non-fixed portion that is not fixed to the skin contact sheet, and at least a part of the non-fixed portion is disposed in a region between the openings between the stool opening and the urine opening. Disposable diapers.   The fixing portions of the pair of opening elastic members are disposed so as to curve toward the center in the width direction of the skin contact sheet along the outer edge of the stool opening and the outer edge of the urine opening. The disposable diaper according to claim 1.

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