JP4808504B2 - 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 further includes a skin contact sheet that is disposed above 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 permeates 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 (see, for example, Patent Document 1).

  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 arranged on the top of the top sheet (for example, Patent Documents 2 and 3). 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.

Japanese Patent No. 2572744 (FIG. 3) Utility Model Registration No. 2559050 (paragraph 0010, FIG. 2) JP 2002-11044 A (paragraph 0020, FIG. 1)

  In the disposable diaper as described in Patent Documents 2 and 3, since the skin contact sheet first comes into contact with the wearer's skin, the top sheet disposed at the lower part of the skin contact sheet is in direct contact with the wearer's skin. It becomes difficult to do. 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, even in the disposable diaper having the skin contact sheet as described above, the urine and soft stool that have once passed through the skin contact sheet and led to the top sheet ooze out from the skin contact sheet, and the wearer's skin. There is a problem that it may adhere to the urine (so-called “urine return, stool return”). That is, in terms of preventing urine return and stool return, it is not fully satisfactory and still has problems to be solved.

  Thus, at present, there is no disclosure of disposable diapers in which excreted stool is less likely to come into direct contact with the wearer's skin, and which can effectively prevent urine return and stool return, and such disposable diapers are not disclosed. Is anxious. The present invention has been made to solve such problems of the prior art, and it is difficult for the excreted stool to be in direct contact with the skin of the wearer and to effectively prevent urine return and stool return. Provide disposable diapers to get.

  As a result of intensive studies to solve the problems of the prior art as described above, in the disposable diaper provided with the conventional skin contact sheet, the skin contact sheet is a liquid-permeable sheet (hydrophilic sheet). In such a case, since urine and soft stool permeate the skin contact sheet and ooze out on the surface, it was found that urine return and stool return are likely to occur. It was also found that urine moved with the hydrophilizing agent on the skin contact sheet, and that urine exuded when pressure was applied. Therefore, the skin contact sheet is entirely composed of a water-repellent sheet, and it is conceived that the above problem can be solved by binding the water-repellent skin contact sheet to the diaper body by a hydrophilic joint sheet. Completed. 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 provided with a back sheet made of a functional material, further comprising a skin contact sheet disposed on an upper part of the top sheet and having an opening (stool passing opening) through which feces can pass; The skin contact sheet is entirely composed of a breathable water-repellent sheet , and one end of a hydrophilic joint sheet separate from the skin contact sheet is bonded to both side edges of the skin contact sheet, and the hydrophilic contact sheet is joined . The other end of the joint sheet is connected to the top sheet, and the hydrophilic joint sheet includes the skin contact sheet and the top sheet. A disposable diaper characterized in that hydrophilicity is maintained except for a joint with a sheet.

[2] The hydrophilic joint sheet is formed by joining a breathable water-repellent sheet to both edges formed by folding both edges of the top sheet, except for a joint with the top sheet. The disposable diaper according to [1], wherein hydrophilicity is maintained.

[3] The disposable diaper according to [1] or [2], wherein a tensile strength or tear strength in the width direction of the hydrophilic joint sheet is lower than a tensile strength or tear strength in the width direction of the skin contact sheet, respectively.

[4] The disposable diaper according to any one of [1] to [3], wherein at least a pair of three-dimensional gathers that are three-dimensionally standing leak-proof walls are formed on both sides of the skin contact sheet.

  The disposable diaper of the present invention is such that excreted stool is less likely to come into direct contact with the wearer's skin, and urine return and stool return can be effectively prevented. Furthermore, since the skin contact sheet is composed of a breathable water repellent sheet, a hydrophilic agent such as a surfactant contained in the liquid permeable sheet, which tends to occur in disposable diapers, is added to the breathable water repellent sheet. This also effectively prevents the disadvantage that the water repellency of the water repellent sheet is lost.

  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, for the convenience of drawing, it drawn in the form which left the leg elastic material from drawing.

  In the present specification, the term “pants-type diaper” refers to the corresponding side edges of the front body 2 and the back body 6 (side edges 2a, 6a) as in the disposable diaper 1 shown in FIGS. , 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 the “two-piece type” means an absorbent main body 14 that functions to absorb and retain the excrement of the wearer (absorption / holding function) and a function (wearing function) that encapsulates the wearer's body. It shall consist of the exterior member 16 to bear, and shall mean the diaper of the type by which the absorptive main body 14 was arrange | positioned inside the exterior member 16. FIG. 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.

  In addition, in this specification, “front body” means a part that covers the abdomen (front of the body) of the wearer when a diaper is worn on the wearer, and “inseam” means that the wearer wears a diaper. 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 was interposed by at least one part between the top sheet 18, the back sheet 20, and the top sheet 18 and the back sheet 20 like the disposable diaper 1 shown in FIGS. A disposable diaper provided with an absorbent body 22, further comprising a skin contact sheet 24 disposed above the surface of the top sheet 18, and the skin contact sheet 24 is entirely constituted by a breathable water repellent sheet 46. Is. Then, one end of a hydrophilic joint sheet 38 separate from the skin contact sheet 24 (46) is joined to both side edges of the skin contact sheet 24, and the other end of the hydrophilic joint sheet 38 is joined to the top sheet 18. The connected and hydrophilic joint sheet 38 is hydrophilic, except for the joint portion 35 between the skin contact sheet 24 (46) and the top sheet 18.

[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 are usually liquid permeable, liquid impermeable or water repellent.

  Here, in the disposable diaper of the present invention, the entire skin contact sheet needs to be composed of a breathable water-repellent sheet. About the part comprised with the ventilation | gas_flowing water-repellent sheet, the permeation | transmission of a liquid can be reduced not to mention that the dry touch (dryness) can be maintained even when it wears for a long time. Therefore, once the urine or soft stool that has passed through the skin contact sheet and led to the top sheet oozes out of the skin contact sheet and adheres to the skin of the wearer (so-called “urine return, stool return”) It becomes possible to prevent. Furthermore, since the skin contact sheet is composed of a water-repellent sheet, the liquid-permeable sheet, which tends to occur in the skin contact sheet formed by bonding the liquid-permeable sheet and the liquid-impermeable sheet, It is possible to effectively prevent the disadvantage that the hydrophilic agent such as the surfactant contained is transferred to the water repellent sheet and the water repellency of the breathable water repellent sheet is lost.

  Nonwoven fabrics such as spunbond and card embossing may be used as the constituent material of the breathable water repellent sheet, but SMS (spunbond / meltblown / spunbond), SMMS (spunbond / meltblown) are used because of their high water pressure resistance. / Melt blow / spun bond) or the like is preferably used.

  Conventional liquid-permeable sheets are often used to improve liquid permeability by applying a hydrophilic agent (surfactant or the like) to a nonwoven fabric or the like. There is a problem of diffusing with urine soaked into the permeable sheet.

  In this invention, the said problem was solved by forming a liquid-permeable part with a hydrophilic joint sheet. The joint sheet is preferably made of a woven fabric, a nonwoven fabric, a porous film, or the like, for example. 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 joint sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials.

  The joint sheet of the present invention needs to be configured separately from at least the skin contact sheet, but may be separate from the top sheet, but a part of the top sheet is extended and folded to form a joint sheet. It is preferable to make it function. FIG. 3 shows an example in which the top sheet 18 and the skin contact sheet 24 (46) are joined and connected to each other by a separate joint sheet 38. Skin contact sheet 24 (46) is joined to joint sheet 38 at joint 35. And the joint sheet | seat 38 is in the state exposed to external air except the junction part 35, and hydrophilic property is hold | maintained. Reference numeral 37 denotes a joint between the top sheet 18 and the back sheet, and 39 denotes a joint between the joint sheet 38 and the three-dimensional gather 26.

  FIG. 4 is a schematic cross-sectional view showing another embodiment of the present invention, in which a water-repellent skin contact sheet 24 (46) joins two skin contact sheets 46a and 46b with a predetermined adhesive 46c. In this embodiment, a desired strength can be imparted to the skin contact sheet 24 (46). In FIG. 4, the joint sheet 38 is formed by folding back both edges of the top sheet 18, and 35 is a joint between the skin contact sheet 24 (46) and the top sheet (joint sheet 38) of the folded portion. . In addition, 31 is a surface that is folded and pasted, and this portion is not bonded.

  In the present invention, the hydrophilic joint sheet preferably has a tensile strength or tear strength in the width direction lower than the tensile strength or tear strength in the width direction of the skin contact sheet. The reason is that when a stool comes in, when the stool is rounded with a skin contact sheet, it will be cut at the joint sheet, not the skin contact sheet, so it should be treated cleanly without leaking the stool This is because it becomes possible.

  Joining of the joint sheet and the water-repellent skin contact sheet can be performed by various methods, but is preferably performed by a hot melt adhesive.

  In general, hot melt adhesives are (1) ethylene / vinyl acetate copolymer (EVA), ethylene / ethyl acrylate copolymer (EEA), styrene / butadiene block copolymer (SBS), styrene / isoprene block copolymer. Base polymers such as polymers (SIS); (2) Tackifying resins such as rosin derivatives and petroleum resins; (3) Diluents such as oil and wax (paraffin), (4) Other components (anti-aging agents, etc.) It is composed of In the present invention, hot melt adhesives used for sanitary materials such as disposable diapers, sanitary napkins and the like, specifically, SBS, SIS, hydrogenated SBS (SEBS), hydrogenated SIS are used as base polymers. It is preferable to use a hot melt adhesive containing (SEPS) or the like.

The hot melt adhesive may be used when a non-woven fabric is pasted together in the manufacture of a disposable diaper, and the coating amount is about 10 g / m ² at most. On the other hand, in this invention, it is necessary to set it as the coating amount of at least 15 g / m < ² > or more. However, when an amount exceeding 40 g / m ² is applied, the texture of the skin contact sheet becomes hard, and the hot melt adhesive protrudes from the lower surface of the ventilated water repellent sheet 46 and directly contacts the wearer's skin. There is a risk that.

  In a diaper provided with a skin contact sheet, urine may be excreted on the skin contact sheet. In such a case, since urine stays on the skin contact sheet and is not absorbed by the absorbent body, it adheres to the skin of the wearer or leaks from the opening around the leg of the diaper (so-called “lateral leakage”). It may cause a problem. By configuring the liquid-permeable part with the joint sheet, urine passes from the skin contact sheet through the liquid-permeable part and is guided to the inside of the skin contact sheet. Etc. are effectively prevented.

  The skin contact sheet is a member intended to be in close contact with the skin, and its tactile sensation is directly linked to the feeling of wearing. In the present invention, even when sweat or urine gets on the skin contact sheet, it is possible to maintain a light touch and to obtain a comfortable wearing feeling.

  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 contact sheet and fall on the top sheet, greatly reducing the chance of direct contact between the feces and the wearer's skin. Is 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. The size of the hole or slit may be appropriately determined in consideration of the function of “passing stool”.

  In addition, the feces passage opening has a shape in which the opening area of the rear area (rear area) from the center line is smaller than the opening area of the front area (front area) from the center line in the front-rear direction. It is preferable to form the stool passage opening, and it is more preferable that the stool passage opening has a shape having a maximum opening width (maximum opening) in the front region. By setting it as such a shape, the situation which the stool which passed the skin contact sheet and fell on the top sheet adheres to a wearer's buttocks, especially a ridge groove can be prevented effectively. On the other hand, since the opening area of the front region is kept large, the passage of stool is not hindered.

  For example, in the disposable diaper 1 shown in FIG. 2, the stool passing opening 28 a has an approximately oval shape. In the present specification, the “center line in the front-rear direction” means a straight line extending in the left-right direction of the diaper from the midpoint of the straight line connecting the front end and the rear end of the feces passage opening 28a.

  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 the space into the 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 central 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 the skin contact sheet can be stretched with the minimum necessary stretch material.

  As a method for fixing the skin contact sheet, as in the disposable diaper 1 shown in FIG. 3, the sheet material 32a, 32b constituting the three-dimensional gathers 26a, 26b and the top sheet 18 (or the back sheet 20) are sandwiched. A method for fixing the skin contact sheet 24 can be given.

[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. The disposable diaper of the present invention preferably has at least a pair of three-dimensional gathers formed on both sides of the skin contact sheet. 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, it is preferable to use a water-repellent material from the viewpoint of improving the leak-proof property of the three-dimensional gather. As the water repellent material, the same material as the breathable water repellent sheet already described in the section of the skin contact sheet can be used.

  The three-dimensional gather may be formed by folding back the top sheet or the back sheet of the absorbent main body, but it is preferable to form a sheet material completely separate from these. 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.

  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 in order to improve the standing property of the three-dimensional gather, It is preferable to arrange one or a plurality of opening elastic members near the upper 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 at a part in 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.

  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.

  In the disposable diaper of the present invention, at least a pair of three-dimensional gathers are preferably formed, but two or more pairs may be arranged.

[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 the side flap portion of the diaper is resistant to liquid permeation. A form in which a top sheet (side sheet) made of a water repellent material is arranged 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. This absorbent main body has a structure in which a top sheet is disposed on the upper surface side of the absorbent body and a back sheet is disposed on the lower surface side, and the absorbent body is interposed between the top sheet and the back sheet. For example, the disposable diaper 1 shown in FIG. 3 sandwiches the absorbent body 22 between the top sheet 18 and the back sheet 20, and seals the peripheral edge of the absorbent body 22, 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.

[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 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 1 shown in FIGS. 1 and 2, a plurality of leg-holes elastic 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 all water-repellent skin contact sheet is connected to the center sheet by a hydrophilic joint sheet. Particularly preferably, both edge portions of the center sheet are folded and joined to both side edges of the skin contact sheet.

  Next, the stool passage opening 28a and the urine passage opening 28b are formed in the skin contact sheet. By doing so, the elastic material of the opening crosses at a point P between the stool passage opening 28a and the urine passage opening 28b, and one of the peripheral edges of the stool passage opening 28a and the urine passage opening 28b. A skin contact sheet 24 having a two-layer structure arranged in a pattern surrounding the portion 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 by sandwiching the two three-dimensional gather elastic members 36a, 36b (36c, 36d) 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.

[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 1 piece type underpants type 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 disposing the skin contact sheet above the surface of the top sheet and forming at least a pair of three-dimensional gathers.

  “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” as in pants-type 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 particularly suitable as a disposable diaper for infants, because the excreted stool is less likely to come into direct contact with the wearer's skin and there is little stool return or urine return, so that the skin is weak and skin trouble is frequent Can be used.

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.

Explanation of symbols

1: disposable diaper, 2: front body, 2a, 2b: side edge, 4: crotch, 6: back body, 6a, 6b: side edge, 8: joint, 10: waist opening, 12, 12a, 12b: Leg opening, 14: Absorbent body, 16: Exterior member, 18: Top sheet, 20: Back sheet, 22: Absorber, 24: Skin contact sheet, 26, 26a, 26b: Solid gather, 28: Opening part, 30: Opening / extracting material, 31: Folded and laminated surface, 32, 32a, 32b: Sheet material, 34: Upper edge, 35: Joint part of skin contact sheet and folded top sheet, 36, 36a, 36b, 36c, 36d: three-dimensional gather elastic material, 37: joint part, 38: joint sheet, 39: joint part, 40: leg elastic material, 42: waist elastic material, 44: belly Ri stretchable material, 46: breathable water-repellent sheet.

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, and the skin contact sheet is entirely composed of a breathable water repellent sheet,
One end of a hydrophilic joint sheet separate from the skin contact sheet is bonded to both side edges of the skin contact sheet, and the other end of the hydrophilic joint sheet is connected to the top sheet ,
The disposable diaper characterized in that the hydrophilic joint sheet is maintained hydrophilic except for a joint portion between the skin contact sheet and the top sheet.   The hydrophilic joint sheet is formed by bonding a breathable water-repellent sheet to the both edges formed by folding both edges of the top sheet, and has hydrophilicity except for the joint with the top sheet. The disposable diaper according to claim 1, wherein the disposable diaper is held.   The disposable diaper according to claim 1 or 2, wherein a tensile strength or tear strength in the width direction of the hydrophilic joint sheet is lower than a tensile strength or tear strength in the width direction of the skin contact sheet, respectively.   The disposable diaper according to any one of claims 1 to 3, wherein at least a pair of three-dimensional gathers that are three-dimensionally standing leak-proof walls are formed on both sides of the skin contact sheet.

Images