JP2007130496A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper in which a discharged stool does not easily directly contact with the skin of a wearer of the diaper and side leakage of urine can be effectively prevented. <P>SOLUTION: The disposable diaper includes an absorber 22, a top sheet 18 disposed to cover an upper surface of the absorber 22 and at least partially formed of a liquid permeable material, and a back sheet 20 disposed to cover a lower surface of the absorber 22 and formed of a liquid impermeable material. The disposable diaper 1 further includes a skin contact sheet 24 disposed above the top sheet 18 and formed with an opening 28, which is an opening capable of passing a stool therethrough, and to both sides of the skin contact sheet 24, at least a pair of standing gathers 26a and 26b which are leakage prevention walls capable of three-dimensionally standing is formed. Sheet materials 32a and 32b constituting the standing gathers 26a and 26b are formed of a water repellent material, and the sheet materials 32a and 32b constituting the standing gathers 26a and 26b are stuck to an absorbent member 14 so as to clamp a flap portion on the side edge side of the absorbent member 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disposable diaper that includes an absorbent body, a top sheet, and a back sheet, and further includes a skin contact sheet that is disposed on top of the top sheet and has an opening through which feces can pass.

  In recent years, as a diaper for infants or elderly people / handicapped persons, an absorbent body, a top sheet that is arranged so as to cover the upper surface of the absorbent body, and at least partially made of a liquid-permeable material, and a lower surface of the absorbent body Disposable diapers that are arranged so as to cover the back and are provided with a back sheet made of a liquid-impermeable material are widely used. By using the disposable diaper so that the surface of the top sheet is in contact with the skin of the wearer, the urine excreted by the wearer passes through the top sheet and is absorbed and held by the absorber. In addition, the back sheet excellent in leakage prevention prevents the excrement from leaking to the outside of the diaper.

  However, in the disposable diaper having the above-described configuration, although urine passes through the top sheet, most of the stool does not pass through the top sheet and remains on the top sheet. Since the stool remaining on the top sheet adheres to the wearer's crotch and buttocks, it requires cumbersome wiping work, which increases the burden of childcare and care, and also causes skin troubles for the wearer. It was. Such a problem becomes more apparent when the stool excreted by the wearer is soft stool.

  Therefore, a disposable diaper has been proposed in which another sheet body (hereinafter referred to as “skin contact sheet”) is disposed on the top of the top sheet (for example, Patent Documents 1 and 2). reference). In these disposable diapers, an opening (stool passing opening) through which stool can pass is formed in the skin contact sheet, and the feces excreted by the wearer through the stool passing opening are on the top sheet. Configured to fall into.

Utility Model Registration No. 2559050 (paragraph 0010, FIG. 2) JP 2002-11044 A (paragraph 0020, FIG. 1)

  In the disposable diaper as described above, since the skin contact sheet first comes into contact with the skin of the wearer, the top sheet disposed at the lower part of the skin contact sheet is difficult to directly contact the wearer's skin. That is, the wearer's skin and the top sheet are separated from each other. In addition, a shielding layer called a skin contact sheet is interposed between the top sheet and the wearer's skin. 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.

  However, the disposable diaper provided with the skin contact sheet has a problem that leakage from the opening around the leg of the diaper or the like (so-called “lateral leakage”) is likely to occur as compared with a conventional disposable diaper. That is, in terms of preventing side leakage of urine, it is not fully satisfactory and still has problems to be solved.

  Thus, at present, there is no disclosure of a disposable diaper in which excreted stool is difficult to directly contact with the wearer's skin and which can effectively prevent side leakage of urine, and such a disposable diaper is not disclosed. Longed for. The present invention has been made to solve the above-described problems of the prior art, and the excreted stool is less likely to come into direct contact with the wearer's skin, and side leakage of urine can be effectively prevented. A disposable diaper is provided.

  As a result of intensive studies to solve the problems of the prior art as described above, in the disposable diaper provided with the skin contact sheet, urine may be excreted on the skin contact sheet, In such a case, since urine diffuses along the skin contact sheet, it was found that urine side leakage is likely to occur. Then, in addition to providing the skin contact sheet, the inventors have conceived that the above problems can be solved by forming at least a pair of three-dimensional gathers on both sides of the skin contact sheet, thereby completing the present invention. Specifically, the following disposable diapers are provided by the present invention.

[1] An absorber, disposed so as to cover the upper surface of the absorber, a top sheet made of at least a part of a liquid-permeable material, and disposed so as to cover the lower surface of the absorber, and impermeable to liquid A disposable diaper comprising a back sheet made of a functional material, further comprising a skin contact sheet disposed on an upper part of the top sheet and formed with an opening through which feces can pass, on both sides of the skin contact sheet In addition, at least a pair of three-dimensional gathers that are three-dimensionally standing leak-proof walls are formed, a sheet material that constitutes the three-dimensional gather is made of a water-repellent material, and a peripheral portion of the absorber is the top sheet and the back An absorbent main body sealed so as to be sandwiched between sheets is formed, and the absorbent main body is sandwiched between flap portions on the side edges of the absorbent main body. The disposable diaper sheet material is bonded to constitute the three-dimensional gathers on.

[2] The disposable diaper according to [1], wherein the three-dimensional gather is formed along both side edges of the skin contact sheet.

[3] The disposable diaper according to [1] or [2], wherein the three-dimensional gather is formed such that an upper end edge thereof is disposed at a position higher than a surface of the skin contact sheet.

[4] The disposable diaper according to any one of [1] to [3], wherein the three-dimensional gather has a lower end edge disposed on a surface of the skin contact sheet.

  The disposable diaper of the present invention makes it difficult for the excreted stool to be in direct contact with the wearer's skin and to effectively prevent urinary side leakage. That is, the disposable diaper of the present invention has an excellent effect that it can avoid the problem (lateral leakage of urine) caused by installing the skin contact sheet while maintaining the effect of installing the skin contact sheet. Is. In the disposable diaper of the present invention, the sheet material constituting the three-dimensional gather is made of a water repellent material, and the sheet material is bonded so as to sandwich the flap portion on the side edge side of the absorbent main body. That is, the end surface on the side edge side of the top sheet constituting the absorbent main body is encapsulated by a sheet material constituting a three-dimensional gather made of a water repellent material, and has a structure that is not exposed to the outside of the diaper. Therefore, the effect that the leakage from the end surface on the side edge side of the top sheet can be effectively prevented is exhibited.

  Hereinafter, the best mode for carrying out the disposable diaper of the present invention will be specifically described by taking a two-piece type pant 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. 3-FIG. 7, for the convenience of drawing, it drawn in the form which left the leg periphery elastic material from drawing.

  Further, in the present specification, when referring to “pants-type diapers”, like the disposable diaper 1 shown in FIGS. 1 and 2, corresponding side edges of the front body 2 and the back body 6 (side edges 2a, 6a). , The side edge portions 2b and 6b) are joined to form a joint portion 8, one waist opening portion 10 and a pair of leg opening portions 12a and 12b, which means a diaper configured in a pants shape in advance. Shall. And "2 piece type" means the absorbent main body 14 that absorbs and retains the excrement of the wearer (absorption / holding function), like the disposable diaper 1 shown in FIG. 1 and FIG. It is composed of an exterior member 16 having a function of encapsulating a wearer's body (a mounting function), and means a type of diaper in which an absorbent main body 14 is disposed inside the exterior member 16. As shown in FIG. 3, the absorbent main body 14 is a member that includes an absorbent body 22, a top sheet 18, and a back sheet 20 as constituent elements.

  Further, in this specification, “front body” means a part covering the abdomen (front of the body) of the wearer when wearing a diaper, and “inseam” means wearing a diaper to the wearer. When the wearer wears a diaper, the part covering the inseam of the wearer means the part covering the back side (back of the body) of the wearer.

[1] Configuration of the disposable diaper of the present invention:
The disposable diaper of this invention is a disposable diaper provided with the absorber 22, the top sheet 18, and the back sheet 20 like the disposable diaper 1 shown in FIGS. A three-dimensional gather that is a leak-proof wall that can stand up three-dimensionally on both sides of the skin contact sheet 24. The skin contact sheet 24 is further provided with a stool passing opening (stool passing opening 28a). 26 (26a, 26b) is formed at least as a pair.

[1-1] Skin contact sheet:
The skin contact sheet is a member for separating the wearer's skin and the top sheet, and is disposed in the upper part of the top sheet, and is formed in a sheet shape in which an opening through which stool can pass (a stool passing opening) is formed. It is a member. By providing this skin contact sheet, the skin contact sheet first comes into contact with the skin of the wearer, and therefore the top sheet disposed at the lower part of the skin contact sheet is difficult to directly contact the wearer's skin. That is, the wearer's skin and the top sheet are separated from each other. In addition, a shielding layer called a skin contact sheet is interposed between the top sheet and the wearer's skin. Therefore, even if the stool remains on the top sheet, it is possible to greatly reduce the chance that the stool and the skin of the wearer are in direct contact.

  As a material constituting the skin contact sheet, for example, a nonwoven fabric made of a resin such as polyethylene, polypropylene, or polyester, a mesh sheet, or a film can be used. Especially, it is preferable to use a nonwoven fabric in the point that the touch is favorable. These materials may be liquid permeable, liquid impermeable, or water repellent. However, a water repellent material (such as a water repellent nonwoven fabric) is preferable in that it can maintain a light touch (dryness) even when worn for a long time.

  The skin contact sheet needs to be formed with an opening (stool passing opening) through which the stool excreted by the wearer can pass. By adopting such a structure, the feces excreted by the wearer pass through the skin contact sheet and fall onto the top sheet, greatly reducing the chance of direct contact between the feces and the wearer's skin. It becomes possible.

  As long as the opening has a shape that allows stool to pass through, the shape is not particularly limited. That is, the "opening" through which stool can pass includes not only so-called openings (holes) such as circular openings, elliptical openings, rhombus openings, but also linear slits, cross-shaped slits, three or more slits. Also included are slits such as star-shaped slits that intersect. Among these, an elliptical opening or a star-shaped slit whose longitudinal direction is the longitudinal direction (longitudinal direction) of the diaper is preferable. The oval opening has the advantage that the stool is easy to pass through the opening of the skin contact sheet, and the star-shaped slit has the stool once passing through the opening of the skin contact sheet and falling on the top sheet. There is an advantage that it is possible to effectively prevent the skin contact sheet from being exposed again and contaminating the wearer's buttocks. For example, the disposable diaper 1 shown in FIG. 2 has an oval opening having a major axis in the longitudinal direction of the diaper as a stool passing opening 28a in a portion corresponding to the crotch part 4 of the diaper of the skin contact sheet 24. This is an example of formation. The size of the hole or slit may be appropriately determined in consideration of the function of “passing stool”.

  The skin contact sheet may have an opening for passing urine on the front body side of the opening. That is, it is preferable that the skin contact sheet is formed with a fecal passage opening and a urine passage opening as openings.

  By forming the urine passage opening as described above, the urine excreted by the wearer through the opening can be surely flowed into the skin contact sheet. It is possible to effectively prevent a situation in which urine diffuses and a side leak occurs from an opening around the leg of the diaper. For example, the disposable diaper 1 shown in FIG. 2 is an example in which an elliptical urine passage opening 28b is further formed as an opening 28 in the skin contact sheet 24 in addition to an elliptical stool passage opening 28a. . In this example, the stool passage opening 28a is formed in a portion corresponding to the crotch part 4 of the diaper, and the urine passage opening 28b is formed in a portion closer to the front body 2 than the stool passage opening 28a. .

  When the two openings (stool passage opening and urine passage opening) are formed as described above, the space between the skin contact sheet and the top sheet communicates with the stool passage opening. It is preferable to provide a separation wall that divides into a space that communicates with the urine passage opening and a space that communicates with the urine passage 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.

  It is preferable to arrange a stretchable material (opening stretchable material) on the outer edge of the opening. When the opening stretchable material is disposed, tension is applied to the skin contact sheet, so that the skin contact sheet can be firm. Therefore, it is possible to prevent the skin contact sheet from falling to the top sheet side, and there is an advantage that the skin contact sheet can easily come into contact with the wearer's skin. Further, when the opening stretchable material is disposed, the skin contact sheet is contracted, and the top sheet, the absorbent body, and the back sheet can act to bend downward (exterior member side). Therefore, the skin contact sheet can be kept floating from the top sheet, and the skin contact sheet and the top sheet can be reliably separated from each other.

  As the opening stretchable material, stretchable materials that have been used in conventional disposable diapers can be suitably used. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc., as well as thread rubber and flat rubber made of elastic materials such as natural rubber and synthetic rubber (urethane rubber, etc.). .

  The arrangement pattern of the opening stretchable material is not particularly limited as long as it is a pattern that can exert the above-described effect, but the opening stretchable material surrounds the periphery of the opening so as to make the stretching force act reliably on the opening. It is preferable to arrange in a pattern. For example, the opening stretchable material may be arranged in a pattern such as a circle, an ellipse, or a rhombus so as to surround the periphery of the opening.

  Also, a pattern in which two opening elastic members are used as the opening elastic members, and the two opening elastic members intersect at at least one point before and after the opening and surround a part of the periphery of the opening. It is also one of the preferable forms that it is arrange | positioned. When the opening stretchable material is arranged in such a pattern, it is possible to continuously arrange the opening stretchable material in the front-rear direction of the diaper, so that it is easy to continuously manufacture disposable diapers. Is preferable.

  For example, the disposable diaper 1 shown in FIG. 2 uses two opening elastic members 30a and 30b as the opening elastic members 30, and the two opening elastic members 30a and 30b are the stool passage opening 28a and the urine. This is an example in which the crossing is made at a point P between the passage openings 28b and the stool passage openings 28a and the urine passage openings 28b are partly surrounded by a pattern. When the opening elastic members 30a and 30b are arranged in such a pattern, it is possible to easily manufacture an absorbent main body continuous body in which the absorbent main body 14 is continuously arranged in the longitudinal direction.

  In addition, the disposable diaper 1 shown in FIG. 2 is arranged such that the opening elastic members 30 a and 30 b intersect at the center of the crotch part 4. By adopting such an arrangement, it is possible to exert a greater stretching force in the width direction (diaper left-right direction) in the crotch part 4 (that is, in the vicinity of the point P) than in the front body 2 side and the back body 6 side of the diaper. it can. Therefore, the skin contact sheet 24 has an effect of making the portion between the stool passage opening 28a and the urine passage opening 28b, which are relatively loose, more closely contact the wearer's skin. Further, in the disposable diaper 1 shown in FIG. 2, the opening elastic members 30a and 30b do not intersect except at the center point P of the crotch part 4, and the peripheral edge and urine on the back body 6 side of the feces passage opening 28a It arrange | positions in the pattern by which the peripheral part by the side of the front body 2 of the opening part 28b for opening was open | released. By setting it as such an arrangement | positioning, since the front body 2 side and the back body 6 side of the skin contact sheet 24 do not adhere too much with respect to a wearer's skin, air permeability can be ensured. Therefore, sweating due to the contact of the skin contact sheet is suppressed, and stuffiness and skin trouble caused by sweat can be effectively prevented.

  The opening stretchable material as described above 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.

  The opening stretchable material is preferably fixed in an expanded state in order to cause a sufficient stretching force to act on the opening. For example, when the opening stretchable material is natural rubber or synthetic rubber, it is preferably fixed in a stretched state of 100 to 400%, and more preferably fixed in a stretched state of 200 to 300%. By fixing in the extended state in such a range, it is possible to cause a sufficient stretching force to act on the opening and to prevent the opening from being reduced more than necessary.

  The arrangement method of the opening stretchable material is not particularly limited. For example, like the disposable diaper 1 shown in FIG. 3, the skin contact sheet 24 is bonded to two sheet materials (upper sheet 24a and liner sheet 24b). It is preferable that the opening stretchable members 30a and 30b are sandwiched between the upper sheet 24a and the liner sheet 24b. Employing such an arrangement method is preferable because it can impart stretching force to the skin contact sheet with the minimum necessary stretching material.

  Even in the case of adopting the above-described configuration, the skin contact sheet is sufficient if the portion where the opening stretchable material is disposed is composed of two sheet materials, and the entire skin contact sheet is not necessarily two. It is not necessary to be constituted by the sheet material. For example, in the disposable diaper 90 shown in FIG. 7, a portion where the opening elastic members 30a and 30b are arranged is constituted by two sheet materials (upper sheet 24a and liner sheet 24b), and the other portion is a single sheet. It is the example comprised by the material (upper sheet | seat 24a).

  In the case of the above configuration, when the rising portion from the standing line 46 of the skin contact sheet 24 is configured by only one sheet material (upper sheet 24a), the configuration is configured by two sheet materials. As compared with the above, the rising portion from the rising line 46 is flexible and supple. Therefore, since the skin contact sheet 24 stands up easily and follows the shape of the wearer's skin (inseam), it becomes easy to adhere to the skin contact sheet, so that good fit is obtained and the original effect of the skin contact sheet is sufficient. There is an advantage of being demonstrated. The disposable diaper 90 shown in FIG. 7 is an example in which the liner sheet 24b is configured to be narrow, and the three-dimensional gathers 26a and 26b are configured by the wide upper sheet 24a protruding from the narrow liner sheet 24b. On the other hand, the same effect can be obtained even when the upper sheet is configured to be narrow and the three-dimensional gather is configured by the wide liner sheet protruding from the narrow upper sheet.

  The skin contact sheet can be fixed by (1) bonding the sheet materials 32a and 32b constituting the three-dimensional gathers 26a and 26b and the top sheet 18 (or the back sheet 20) as in the disposable diaper 1 shown in FIG. A method of fixing the skin contact sheet 24 so as to be sandwiched between the portions; (2) an inner surface of the three-dimensional gathers 26a, 26b as in the disposable diaper 60 shown in FIG. 4, and the upper edge 34 of the three-dimensional gathers 26a, 26b; And a method of fixing the skin contact sheet 24 to a portion between the lower end edge (the upright line 38) and the like.

  Moreover, you may fix a skin contact sheet to the inner area | region enclosed by the solid gather which becomes a pair, without making it contact with a solid gather. For example, (3) a bonded portion (so-called flap portion) of the top sheet 18 and the back sheet 20 of the absorbent main body 14 in a region surrounded by the three-dimensional gathers 26a and 26b as in the disposable diaper 70 shown in FIG. (4) The absorbent body of the top sheet 18 constituting the absorbent main body 14 in the region surrounded by the three-dimensional gathers 26a and 26b as in the disposable diaper 80 shown in FIG. For example, a method of fixing the skin contact sheet 24 at a position corresponding to the upper portion 22 can be used.

  Moreover, (5) When the absorptive main body 14 is configured so that the back sheet 20 protrudes from the lower side of the top sheet 18 as in the disposable diaper 90 shown in FIG. 7, it is surrounded by the three-dimensional gathers 26a and 26b. A method of fixing the skin contact sheet 24 to both the top sheet 18 and the back sheet 20 of the absorbent main body 14 in the region can also be adopted. Among the methods (1) to (5), the method (1) is preferable in that the effect of closely attaching the skin contact sheet to the wearer's skin is high.

[1-2] Solid gathering:
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 this three-dimensional gather, urine is excreted on the skin contact sheet, and even if urine diffuses along 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.

  As the sheet material constituting the three-dimensional gather, a water-repellent material is used from the viewpoint of improving the leak-proof property of the three-dimensional gather. Non-woven fabrics such as spunbond and card embossing may be used as the water repellent material, but because of high water pressure resistance, SMS (spunbond / meltblown / spunbond), SMMS (spunbond / meltblown / meltblown / spun) It is preferable to use a non-woven fabric such as a bond.

  The three-dimensional gather can be formed by folding back the top sheet, the back sheet, or the skin contact sheet of the absorbent main body. For example, the disposable diaper 90 shown in FIG. 7 is an example in which a pair of three-dimensional gathers 26a and 26b are formed by folding both side edges of the skin contact sheet 24. More specifically, the three-dimensional gather is the skin contact sheet. It is an example which is formed by a folded portion of a side edge and is configured integrally with the skin contact sheet. However, it is more preferable that the three-dimensional gather is formed by bonding a sheet material that is completely different from the top sheet, the back sheet, and the skin contact sheet. For example, in the disposable diaper 1 shown in FIGS. 2 and 3, a pair of sheet materials 32 a and 32 b that are completely different from the top sheet 18 and the back sheet 20 are bonded to both side edges of the absorbent main body 14. This is an example in which three-dimensional gathers 26a and 26b are formed.

  Moreover, in the disposable diaper of this invention, the sheet | seat material which comprises a solid gather is bonded together to the absorptive main body so that the flap part of the side edge side of an absorptive main body may be inserted | pinched. With such a configuration, the end surface on the side edge side of the top sheet constituting the absorbent main body is encapsulated by a sheet material constituting a three-dimensional gather, that is, a sheet material made of a water repellent material, and is exposed to the outside of the diaper. Take a structure that does not. Therefore, the effect that the leakage from the end surface on the side edge side of the top sheet can be effectively prevented is exhibited.

  As the three-dimensional gather stretchable material, the same stretchable material as the already described opening stretchable material can be used. One or more three-dimensional gather elastic materials may be arranged for one three-dimensional gather. Moreover, there is no restriction | limiting in particular also about an arrangement position. For example, it may be arranged in the vicinity of the lower end edge (standing line) of the three-dimensional gather, or between the upper end edge and the lower end edge (standing line) of the three-dimensional gather, but is preferably arranged in the vicinity of the upper end edge of the three-dimensional gather. .

  For example, the disposable diaper 1 shown in FIGS. 2 and 3 is an example in which a three-dimensional gather elastic material 36 is disposed in the vicinity of the upper edge 34 of the three-dimensional gathers 26a, 26b, and the end portions of the sheet materials 32a, 32b (three-dimensional gather 26a, 26b, and the two gathered elastic members 36a, 36b or the three gathered elastic members 36c, 36d are disposed between the folded portions.

  The height of the three-dimensional gather (length from the lower end edge to the upper end edge) is preferably 5 to 80 mm, and more preferably 10 to 40 mm. In addition to being able to ensure a sufficient leak-proof effect by setting it to 5 mm or more, by making it 80 mm or less, the three-dimensional gather covers the surface of the skin contact sheet or the top sheet, and this impedes the absorption effect. Can be prevented.

  There are three types of three-dimensional gathers: (1) Inverted gathers that incline toward the inner side of the diaper, (2) Outer gathers that incline toward the outer side of the diaper, and (3) A bent portion in part of the height direction And three-dimensional gathers (C-folded gathers, Z-folded gathers, etc.) in which folded portions are formed. Of these, inward gathering is preferable in terms of high leakage prevention. For example, the disposable diaper 1 shown in FIGS. 2 and 3 is an example in which the three-dimensional gathers 26a and 26b are inwardly gathered.

  The three-dimensional gather is preferably formed on both sides of the skin contact sheet for the purpose of preventing side leakage of urine. Especially, it is preferable that it forms along the both-sides edge part of a skin contact sheet. By doing this, even when urine is excreted on the skin contact sheet and the urine diffuses through the skin contact sheet, the three-dimensional gather surely functions as a breakwater, and from the openings around the legs. Side leakage can be effectively prevented.

  For example, in the case of the disposable diaper 1 shown in FIG. 2 and FIG. 3, the skin contact sheet 24 is disposed up to both side edges of the absorbent main body 14, and the three-dimensional gathers 26 a and 26 b are connected to both side edges of the skin contact sheet 24. That is, it is an example formed along both side edges of the absorbent main body 14. In addition, although the disposable diaper 1 shown in FIG.2 and FIG.3 is an example in which the three-dimensional gathers 26a and 26b were formed over the both sides edge region of the absorptive main body 14, from the objective of preventing the side leakage of urine, It should just be arrange | positioned at the part corresponded at least to the crotch part of a diaper.

  In the case where the skin contact sheet 24 and the three-dimensional gathers 26a and 26b are integrally formed as in the disposable diaper 90 shown in FIG. 7, for example, the three-dimensional gathers 26a and 26b stand on both sides of the skin contact sheet 24. The one formed along the line 46 has the same effect as that formed by “the three-dimensional gather is formed along both side edges of the skin contact sheet”, and is included in the scope of the present invention. The part that essentially functions as the skin contact sheet is the part above the upright line, and when the skin contact sheet and the three-dimensional gather are integrally formed, the upright line of the skin contact sheet is used as the skin contact sheet. This is because it can be regarded as a side edge of the. That is, even in such a form, even when urine is excreted on the skin contact sheet and the urine is diffused through the skin contact sheet, the three-dimensional gather surely functions as a breakwater, It exhibits the effect of effectively preventing side leakage from the surrounding opening.

  The three-dimensional gather is preferably formed so that the upper end edge thereof is disposed at a position higher than the surface of the skin contact sheet. By doing so, when urine is excreted on the skin contact sheet and the urine diffuses through the skin contact sheet, the urine can be prevented from leaking over the three-dimensional gather. .

  Examples of the method of arranging the upper end edge of the three-dimensional gather at a position higher than the surface of the skin contact sheet include a method of arranging the lower end edge of the three-dimensional gather on the surface of the skin contact sheet. That is, in the disposable diaper of the present invention, it is preferable that the lower end edge of the three-dimensional gather is disposed on the surface of the skin contact sheet. By doing so, the upper end edge of the three-dimensional gather is surely arranged at a position higher than the surface of the skin contact sheet. At this time, by appropriately adjusting the height of the three-dimensional gather according to the surface height of the skin contact sheet, it is possible to more reliably prevent a situation where urine leaks over the three-dimensional gather and leaks outside.

  For example, in the disposable diaper 1 shown in FIG. 3, the skin contact sheet 24 is fixed so as to be sandwiched between the bonded portions of the three-dimensional gathers 26a and 26b and the top sheet 18, whereby the bottom edges of the three-dimensional gathers 26a and 26b are skin contacted. This is an example in which the upper end edge 34 of the three-dimensional gathers 26 a and 26 b is arranged at a position higher than the surface of the skin contact sheet 24. In the present specification, the “lower edge of the three-dimensional gather” means a fixed end of the three-dimensional gathers 26a and 26b, that is, a portion of the upright line 38, as shown in FIG.

  For example, as in the disposable diaper 90 shown in FIG. 7, the method of forming the three-dimensional gathers 26 a and 26 b by folding the side edge side of the skin contact sheet 24 is also “the bottom edge of the three-dimensional gather is the surface of the skin contact sheet. The same effect as that of the “method of disposing the device” is included in the scope of the present invention. When the skin contact sheet 24 and the three-dimensional gathers 26a and 26b are integrally formed as in the disposable diaper 90 shown in FIG. 7, the lower end edge (standing line 38) of the three-dimensional gathers 26a and 26b and the skin contact sheet This is because the 24 surfaces can be regarded as being configured continuously. That is, even in such a form, the height of the three-dimensional gather is appropriately adjusted according to the surface height of the skin contact sheet, thereby more reliably preventing the situation where the urine gets over the three-dimensional gather and leaks outside. It becomes possible to do.

  In addition, in the disposable diaper of this invention, although at least one pair of solid gathers is required, two or more pairs may be formed.

[1-3] 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.

  It is preferable that the absorber is 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.

[1-4] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the upper 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 non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and 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 a tape-type diaper described later, a top sheet (center sheet) made of a liquid-permeable material is disposed at the center of the diaper, and a top sheet (side sheet) made of a water-repellent material is disposed on the side flap portion of the diaper. A form of arranging is often used.

[1-5] Backsheet:
A back seat | sheet is a sheet | seat arrange | positioned so that the lower 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.

[1-6] Absorbent body:
In the two-piece type pants-type diaper, the top sheet, the back sheet, and the absorbent body are configured as one member called an “absorbent body” that is responsible for absorption and holding functions, and an exterior member that is manufactured separately. A disposable diaper is formed by joining. Like the sanitary napkin, this absorbent main body has a top sheet on the upper surface side of the absorbent body and a back sheet on the lower surface side. The absorbent body is interposed between the top sheet and the back sheet. It has a structured. The disposable diaper of the present invention is, for example, like the absorbent main body 14 of the disposable diaper 1 shown in FIG. 3, the absorbent body 22 is sandwiched between the top sheet 18 and the back sheet 20 and the peripheral portion of the absorbent body 22 is sealed. By wearing, an absorbent main body having a structure in which an absorber 22 is interposed between the top sheet 18 and the back sheet 20 is provided.

  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.

[1-7] 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 diaper, the absorbent main body serves exclusively for the absorption / holding function of absorbing and holding the excrement of the wearer, so a liquid-impermeable material as a material constituting the exterior member There is no need to use. 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 1 shown in FIGS. 1 to 3, the exterior member 16 is composed of two non-woven fabrics, and the leg elastic member 40, the waist elastic member 42, and the belly elastic member between the two non-woven fabrics. This is an example in which 44 is sandwiched and fixed.

[1-8] 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, preventing urine leakage from around the waist, and improving the fit of the diaper to the wearer, thereby preventing the diaper 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 1 shown in FIGS. 1 and 2, a plurality of leg-hole stretchable members 40 are arranged on the periphery of the leg-hole openings 12 a and 12 b, and the waist-hole opening is provided on the periphery of the waist-hole 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 already described is employable. 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] 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 1 (two-piece type pants-type diaper) shown in FIGS.

[2-1] 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.

[2-2] Production of skin contact sheet:
The upper sheet 24a is bonded to the upper surface of the liner sheet 24b while arranging the two opening stretchable members 30a and 30b in a predetermined pattern. At this time, the two opening elastic members 30a and 30b intersect at a point P between the feces passage opening 28a and the urine passage opening 28b to be formed later, and the feces passage opening 28a and the urine passage It arrange | positions in the pattern which surrounds a part of periphery of the opening part 28b for an object.

  Next, the stool passage opening 28a and the urine passage opening 28b are formed in the liner sheet 24b and the upper sheet 24a which are bonded together. By doing so, the two opening elastic members 30a and 30b intersect at a point P between the fecal passage opening 28a and the urine passage opening 28b, and the feces passage opening 28a and the urine passage opening. A skin contact sheet 24 having a two-layer structure arranged in a pattern surrounding a part of the periphery of 28b is obtained.

[2-3] Production of solid gathers:
One end of the sheet material 32a (32b) is folded, and the three-dimensional gathers 26a (26b) are bonded together with the two three-dimensional gather elastic members 36a, 36b (36c, 36d) sandwiched between the folded portions. Get.

[2-4] Attaching skin contact sheet etc. to absorbent main body:
After the skin contact sheet 24 is bonded to the surface of the top sheet 18 constituting the absorbent main body 14, the three-dimensional gathers 26 a and 26 b are bonded so as to sandwich the side edges of the absorbent main body 14 and the skin contact sheet 24.

[2-5] Production of exterior member:
First, two nonwoven fabrics to be the exterior member 16 are prepared, and a waist elastic member 42, an abdominal elastic member 44, and a leg elastic member 40 are disposed on and bonded to the upper surface of one of the nonwoven fabrics. And by laminating and fixing another nonwoven fabric on the upper surface, the waist elastic member 42, the belly elastic member 44 and the leg elastic member 40 are interposed between the two nonwoven materials. The exterior member 16 is obtained.

[2-6] 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 1 shown in FIGS. 1-3 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.

[3] 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 diaper, For example, it can apply also to 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 disposing the skin contact sheet above the surface of the top sheet and forming at least a pair of three-dimensional gathers.

  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.

  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 can be used particularly suitably as a disposable diaper for infants because the excreted stool is not easily brought into direct contact with the wearer's skin, and the skin is weak and skin troubles are frequent.

It is a schematic perspective view which shows one Embodiment of the disposable diaper of this invention, and is a schematic perspective view which shows the state seen from the front of a diaper. It is a top view which shows one Embodiment of the disposable diaper of this invention, is a top view which expand | deploys the disposable diaper shown in FIG. 1, and shows the state seen from the absorptive main body side of the diaper. It is a schematic sectional drawing which shows one Embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper shown in FIG. 2 along the X-X 'line. It is a schematic sectional drawing which shows another embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper of this invention in the width direction in the part of the opening part for feces passage. It is a schematic sectional drawing which shows another embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper of this invention in the width direction in the part of the opening part for feces passage. It is a schematic sectional drawing which shows another embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper of this invention in the width direction in the part of the opening part for feces passage. It is a schematic sectional drawing which shows another embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper of this invention in the width direction in the part of the opening part for feces passage.

Explanation of symbols

1, 60, 70, 80, 90: disposable diaper, 2: front body, 2a, 2b: side edge, 4: crotch, 6: back body, 6a, 6b: side edge, 8: joint, 10 : Waist circumference opening, 12, 12a, 12b: Leg circumference opening, 14: Absorbent body, 16: Exterior member, 18: Top sheet, 20: Back sheet, 22: Absorber, 24: Skin contact sheet, 24a : Upper sheet, 24b: liner sheet, 26, 26a, 26b: three-dimensional gather, 28: opening, 28a: feces passage opening, 28b: urine passage opening, 30: opening stretchable material, 32, 32a, 32b: sheet material, 34: upper edge, 36, 36a, 36b, 36c, 36d: three-dimensional gather elastic material, 38, 46: standing line, 40: elastic material around leg, 42: elastic material around waist, 44: belly circumference Elastic material P: point.

Claims (4)

An absorber, a top sheet that is arranged so as to cover the upper surface of the absorber, and at least a part that is made of a liquid-permeable material, and a surface that covers the lower surface of the absorber, and is made of a liquid-impermeable material A disposable diaper with a backsheet
The skin contact sheet is further provided with a skin contact sheet disposed on the top sheet and formed with an opening (stool passing opening) through which feces can pass. At least a pair of three-dimensional gathers that are walls are formed,
The sheet material constituting the three-dimensional gather is made of a water-repellent material,
An absorbent main body is formed which is sealed so that a peripheral edge of the absorber is sandwiched between the top sheet and the back sheet,
The disposable diaper by which the sheet | seat material which comprises the said solid gathers is bonded together to the said absorptive main body so that the flap part of the side edge side of the said absorptive main body may be pinched | interposed.   The disposable diaper according to claim 1, wherein the three-dimensional gather is formed along both side edges of the skin contact sheet.   The disposable diaper according to claim 1 or 2, wherein the three-dimensional gather is formed such that an upper end edge thereof is disposed at a position higher than a surface of the skin contact sheet.   The disposable diaper according to any one of claims 1 to 3, wherein a lower end edge of the three-dimensional gather is disposed on a surface of the skin contact sheet.

Images