JP4964693B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper provided with a skin contact sheet disposed above a top sheet in addition to an absorbent body, a top sheet, and a back sheet.

  In recent years, as a diaper for infants or the elderly / handicapped, an absorbent body, a top sheet at least partly made of a liquid-permeable material and arranged to cover the upper surface of the absorbent body, and liquid-impermeable Disposable diapers comprising a back sheet made of a functional material and arranged so as to cover the lower surface of the absorber 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. The back sheet having excellent leakage prevention prevents the excrement from leaking to the outside of the diaper.

  However, in the disposable diaper configured as described above, urine passes through the top sheet, but most of the feces do 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 in which another sheet body (hereinafter referred to as a “skin contact sheet”) is disposed above the top sheet has been proposed (for example, Patent Document 1 and 2). In these disposable diapers, an opening (stool passing opening) through which stool can pass is formed in the skin contact sheet. Therefore, in use, the stool excreted by the wearer is configured to pass through the stool passage opening of the skin contact sheet and fall into the space between the skin contact sheet and the top sheet.

  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 below 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.

  Recently, a disposable diaper in which the skin contact sheet is disposed so as to cover only the region on the back body side of the top sheet has also been disclosed (see, for example, Patent Document 3).

Utility Model Registration No. 2559050 JP 2002-11044 A JP 2007-125259 A

  However, the disposable diaper provided with the conventional skin contact sheet has a problem that it is difficult to form a large space between the skin contact sheet and the top sheet. In other words, there is a problem that the capacity of the stool is not satisfactory.

  Moreover, like the disposable diaper described in Patent Document 3, when the skin contact sheet is disposed so as to cover only the region on the back body side of the top sheet, the skin contact sheet may be brought into close contact with the wearer's skin. There was a problem that it was difficult, and it still left problems to be solved.

  As described above, at present, a large space can be formed between the skin contact sheet and the top sheet, and the stool is excellent in the capacity of accommodation, and the skin contact sheet covers only the area on the back body side of the top sheet. Even in such a case, a disposable diaper capable of bringing the skin contact sheet into close contact with the wearer's skin is not disclosed, and such a disposable diaper is eagerly desired.

  The present invention has been made in order to solve the above-described problems of the prior art, and can form a large space between the skin contact sheet and the top sheet. The present invention provides a disposable diaper capable of bringing a skin contact sheet into close contact with a wearer's skin even when the contact sheet is disposed so as to cover only the region on the back body side of the top sheet.

  As a result of intensive studies to solve the problems of the prior art as described above, in the conventional disposable diaper, the skin contact sheet is often directly fixed to the top sheet. As a result, it has been found that it may be difficult to form a sufficient space between the skin contact sheet and the top sheet. The above problem is solved by attaching a pair of wall-like members (skin contact sheet support walls) for supporting the skin contact sheet and fixing the skin contact sheet so as to bridge between the pair of support walls. As a result, the present invention has been completed. Specifically, the following disposable diapers are provided by the present invention.

[1] An absorbent body formed from the front body, the crotch part, and the back body, a top sheet that is made of at least a part of a liquid-permeable material and covers the upper surface of the absorbent body, and a liquid A back sheet made of an impermeable material and disposed so as to cover the lower surface of the absorbent body, a skin contact sheet in which a fecal passage opening is formed and disposed above the top sheet, and a breathable water repellency A urine / feces separation wall that divides a space formed between the skin contact sheet and the top sheet from a space on the front body side, on the surface of the top sheet, on each side of the absorber A pair of skin contact sheet support walls that can stand up three-dimensionally are provided along the edge, and the skin contact sheet has an opening elastic member disposed on an outer edge of the stool passing opening, and a front end portion. Is disposed separately from the top sheet so as to be positioned above the crotch portion of the top sheet, and is disposed separately from the top sheet so that the rear end is positioned above the rear body of the top sheet. Rutotomoni, the pair of fixed so as to bridge between the skin contact sheet support wall, and covers at least a portion of the crotch region and the back body area of said topsheet, said opening stretchable material 2 The two opening elastic members intersect at a point on the front side of the stool passing opening, surround a part of the periphery of the stool passing opening, and the skin contact The urine / feces separation wall is disposed to the rear end of the sheet, and one end of the breathable water-repellent sheet is joined to the front end of the skin contact sheet and the other end is suspended to the surface of the top sheet. Disposable diapers and is formed by being.

[ 3 ] The disposable diaper according to the above [1] or [2] , wherein the skin contact sheet support wall has a standing stretchable material arranged along the front-rear direction of the diaper.

[ 4 ] Of the surface of the top sheet, a pair of three-dimensional gathers, which are three-dimensionally standing leakage barriers, are attached to a region further outside the standing line of the pair of skin contact sheet support walls. The disposable diaper according to any one of [1] to [ 3 ].

  The disposable diaper of the present invention can form a large space between the skin contact sheet and the top sheet, and is excellent in the capacity for storing feces. And even when it arrange | positions so that a skin contact sheet may cover only the area | region of the back body side of a top sheet, it is possible to stick a skin contact sheet to a wearer's skin.

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. Incidentally, for convenience of drawing, the leg-surrounding stretchable members for 3 to 7, for 4 were plotted in the form of abstracted the junction between the skin contact sheet and breathable water repellent sheet.

  In the present specification, the term “pants-type diaper” refers to the side edges corresponding to the front body 2 and the back body 6 (side edges 2a, 6a, side) as in the disposable diaper 1 shown in FIGS. By joining the edge portions 2b and 6b), a joint portion 8, one waist opening portion 10 and a pair of leg opening portions 12a and 12b are formed, which means a diaper configured in a pants shape in advance. To do.

  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 components.

  Furthermore, the "front body" is the part that covers the wearer's ventral side (front of the body) when the diaper is worn on the wearer, and the "inseam" is the wearer that wears the diaper on the wearer. The part covering the inseam of the wearer, “rear body”, means a part covering the wearer's back side (back of the body) when the wearer wears a diaper.

[1] Disposable diapers:
The disposable diaper of the present invention is a pair of skin contact sheets that can stand up three-dimensionally along the side edges of the absorbent body 22 on the surface of the top sheet 18 as in the disposable diaper 1 shown in FIGS. A support wall 26 (26a, 26b) is provided, and the skin contact sheet 24 is disposed so as to be separated from the top sheet 18 so that the front end portion is located above the crotch portion 4 of the top sheet 18 , and the rear end portion is the top. The seat 18 is disposed so as to be positioned above the crotch part 4 or the back body 6 and spaced apart from the top sheet 18 and fixed so as to bridge between the pair of skin contact sheet support walls 26 (26a, 26b). Thus, at least a part of the crotch 4 region and the back body 6 region of the top sheet 18 is covered.

  Thus, by attaching a pair of skin contact sheet support walls and fixing the skin contact sheet so as to bridge between the support walls, the skin contact sheet is the top surface, the top sheet is the bottom surface, and the skin contact sheet support wall It is possible to form a box-shaped internal space with the side face. Moreover, it is possible to increase the space volume of the internal space by configuring the skin contact support wall high and fixing the skin contact sheet at a high position on the skin contact sheet support wall. Therefore, compared with the conventional disposable diaper, a large space can be formed between the skin contact sheet and the top sheet, and the fecal accommodation capacity is excellent.

[1-1] Skin contact sheet support wall:
The skin contact sheet support wall (hereinafter sometimes simply referred to as “support wall”) is a wall-shaped member for arranging and fixing the skin contact sheet so as to crosslink.

  The support wall can be made of a sheet material such as a non-woven fabric (hereinafter sometimes referred to as “support wall forming sheet”). As long as the skin contact sheet can be supported, the type of the sheet material is not particularly limited. For example, a liquid-permeable non-woven sheet can be used. However, by using a sheet material made of a water repellent material, a function as a three-dimensional gather can be imparted to the support wall. With such a configuration, it is also possible to improve leakproofness against soft stool and watery stool. As the water repellent material, a nonwoven fabric such as spunbond or card embossing can be used. Among these, nonwoven fabrics such as SMS (spunbond / meltblown / spunbond) and SMMS (spunbond / meltblown / meltblown / spunbond) have the advantage of high water pressure resistance and can be suitably used.

  For example, like the disposable diaper 1 shown in FIG. 3, the skin contact sheet support walls 26 a and 26 b can be formed by bonding and fixing the support wall forming sheets 32 a and 32 b to the top sheet 18. However, you may fold and form a part of sheet material which comprises other members, such as a top sheet and a back sheet.

  Since it is necessary to fix the support wall so as to crosslink the skin contact sheet, at least a pair of support walls is attached. However, two or more pairs may be formed.

  The support wall is attached to the surface of the top sheet along each side edge of the absorbent body. “Top sheet” means a sheet arranged so as to cover the upper surface of the absorbent body (the surface located on the skin side of the wearer when the diaper is worn), and the liquid permeation arranged in the central part of the diaper. Of course, the top sheet (center sheet) made of a conductive material includes a top sheet (side sheet) made of a water-repellent material or the like disposed on the side flap portion of the diaper.

  For example, in the disposable diaper 1 shown in FIG. 3, the top sheet 18 and the back sheet 20 are bonded to each other in a region outside the outer edge of the absorber 22 to form a flap portion, and the top sheet 18 in the flap portion is formed. This is an example in which skin contact sheet support walls 26 (26a, 26b) are attached to the surface. However, the skin contact sheet support wall may be fixed at a position corresponding to the upper side of the absorbent body 22 of the top sheet 18 constituting the absorbent main body 14.

  “Along each side edge of the absorber” means that the absorber is attached in the same direction as the side edge of the absorber. However, the side edge of the absorber may be formed in a curved line along the leg opening, and is not necessarily formed in a straight line. Therefore, it is not always necessary to be attached so as to be in contact with the side edge of the absorber, and it is not necessary to be attached so as to draw the same locus as the side edge of the absorber. Usually, the support wall is often arranged linearly regardless of the shape of the absorber. For example, like the disposable diaper 1 shown in FIG. 2, the skin contact sheet support walls 26 (26a, 26b) are linearly arranged in the front-rear direction of the diaper.

  The support wall is formed in a structure that can stand up three-dimensionally because it is necessary to form a large space between the skin contact sheet and the top sheet by largely separating the skin contact sheet and the top sheet.

  As long as the structure can stand up three-dimensionally, the structure is not particularly limited, but a structure in which a stretchable material for standing is arranged along the front-rear direction of the diaper is preferable. When the stretchable material for standing is fixed and arranged on the support wall in an extended state, the support wall stands up three-dimensionally due to the contraction force. One or more of the standing stretchable members may be disposed per one supporting wall. And in order to make a support wall stand up reliably, it is preferable to arrange | position the elastic material for standing up in the upper end edge vicinity of a support wall.

  For example, the disposable diaper 1 shown in FIGS. 2 and 3 is an example in which a stretchable material 36 for standing is disposed in the vicinity of the upper edge 34 of the skin contact sheet support wall 26 (26a, 26b), and the support wall forming sheets 32a, 32b. The free end portion (the end portion on the side not fixed to the top sheet 18) is folded, and two standing stretchable members 36a, 36b (36c, 36d) are sandwiched between the folded portions.

  As the stretchable 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 stretchable material for standing as described above is fixed to the support wall forming 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 stretchable material for standing up is preferably fixed in an extended state in order to cause a sufficient stretch force to act on the support wall. When the standing stretchable material is composed of natural rubber or synthetic rubber, it is preferably fixed in an extended state of 120 to 400%, more preferably fixed in an extended state of 200 to 300%. By fixing in the extended state in such a range, a sufficient stretching force can be applied and the support wall can be reliably erected.

  For the purpose of fixing the skin contact sheet, the support wall needs to be formed to have a length corresponding to at least the length of the skin contact sheet (the length in the diaper front-rear direction). However, it can also be formed longer than the length of the skin contact sheet. For example, the disposable diaper 1 shown in FIG. 2 is an example in which the skin contact sheet support wall 26 is formed to a length that covers the entire longitudinal direction of the absorbent body 22. Such a configuration has an advantage that the function of a three-dimensional gather can be imparted to the support wall and the side leakage of excrement can be prevented.

  Moreover, in the disposable diaper 1 shown in FIG. 2, the extending elastic members 36a and 36b are continuously arranged over the entire longitudinal direction of the skin contact sheet support walls 26a and 26b. As described above, the skin contact sheet 24 is fixed to the member (support wall) on which the stretching force acts from the front body 2 to the back body 6 of the diaper, thereby pulling the skin contact sheet 24 in the front body 2 direction. Can act. Thus, even when the skin contact sheet 24 is arranged so as to cover only the region on the back body 6 side of the top sheet 18, the front body 2 direction and the back body 6 direction with respect to the skin contact sheet 24. The pulling force acts on both sides, and the skin contact sheet 24 can be brought into close contact with the wearer's skin.

  The height of the support wall (the length from the lower end edge to the upper end edge) is preferably 20 to 60 mm, and more preferably 30 to 50 mm. By setting it to 20 mm or more, a large space can be formed between the skin contact sheet and the top sheet, and the fecal accommodation capacity can be improved. By setting the thickness to 60 mm or less, the support wall covers the surface of the skin contact sheet or the top sheet, and it is possible to prevent a problem that inhibits the absorption effect.

[1-2] Skin contact sheet:
The skin contact sheet is a member for separating the wearer's skin and the top sheet, and is disposed above the top sheet and has a sheet shape in which an opening (stool passing opening) through which feces can pass is formed. It is a member.

  As a sheet material constituting the skin contact sheet, for example, a nonwoven fabric, a mesh sheet, a film, or the like can be used. Especially, the nonwoven fabric with a favorable touch can be used suitably. 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 because it can maintain a light touch (dryness) even when worn for a long time.

[1-2A] Fixing method:
As for the disposable diaper of this invention, the thing by which the both-sides edge of the skin contact sheet is being fixed to the part between the standing line and upper end edge of a skin contact sheet support wall is preferable. Such a configuration can form a box-shaped internal space with the skin contact sheet as the top surface, the top sheet as the bottom surface, and the skin contact sheet support wall as the side surface. When the skin contact sheet is directly fixed to the top sheet, In comparison, the space volume of the internal space can be increased.

  For example, in the disposable diaper 1 shown in FIGS. 2 to 4, both side edges of the skin contact sheet 24 are the inner surfaces of the skin contact sheet support walls 26 a and 26 b, more specifically, the skin contact sheet support walls 26 a and 26 b. It is being fixed to the part between the upper end edge 34 and the standing line 38 of this. In the illustrated example, the skin contact sheet is fixed to the inner surface of the support wall, but may be fixed to the outer surface of the support wall as long as it is a portion between the upper edge and the upright line.

  The skin contact sheet is preferably fixed at a position that is 10 mm or more away from the standing line of the support wall, and is preferably fixed at a position that is 5 mm or more away from the upper edge of the support wall. By separating from the standing line by 10 mm or more, it is possible to increase the space volume of the internal space and improve the accommodation capacity of the stool. Even if the part of the support wall located above the skin contact sheet fixing surface functions as a three-dimensional gather by separating it by 5 mm or more from the upper edge, even if soft stool or watery stool is on the surface of the skin contact sheet That can prevent the side leakage.

In the disposable diaper of the present invention, the skin contact sheet is disposed separately from the top sheet so that the front end portion is located above the crotch portion of the top sheet , and the rear end portion is located above the back body of the top sheet. To be spaced apart from the topsheet . For example, in the disposable diaper 1 shown in FIGS. 2 and 6, the front end of the skin contact sheet 24 is disposed separately from the top sheet 18 so as to be positioned above the crotch part 4 of the top sheet 18 , and the rear end portion is The top sheet 18 is disposed separately from the top sheet 18 so as to be positioned above the rear body 6 of the top sheet 18 . By doing so, the skin contact sheet can cover at least a part of the crotch region and the back body region of the top sheet.

  In the disposable diaper of the present invention, the skin contact sheet covers at least a part of the crotch region and the back body region of the top sheet. That is, all or part of the crotch region and the back body region of the top sheet are covered, and the region on the front body side of the top sheet is not covered. Such a configuration is less likely to inhibit urine absorption by the skin contact sheet as compared to the case where the skin contact sheet covers the entire top sheet. Moreover, the absorption zone of urine can be opened widely, and an effect that urine leakage is difficult even when there is a shift when wearing a diaper can be obtained.

  For example, in the disposable diaper 1 shown in FIGS. 2 and 6, the skin contact sheet 24 covers a part of the area corresponding to the crotch part 4 of the top sheet 18 and a part of the area corresponding to the back body 6. It is.

[1-2B] Urine / feces separation wall:
Disposable diaper of the present invention is to partition the space between the skin contact sheet and the top sheet, in the space and the front body side space which communicates with the opening for the stool passing. Such a configuration makes it difficult for urine and feces to be mixed, and diaper rash due to the generation of ammonia can be effectively prevented.

Specifically, it is made of a breathable water-repellent sheet, and has a urine / feces separation wall that partitions a space formed between the skin contact sheet and the back body side surface of the top sheet from the space on the front body side. one end of the vent water repellent sheet wherein is joined to the front end portion of the skin contact sheet, the other end the urine feces separation wall is formed by being suspended to the surface of the topsheet.

  For example, the disposable diaper 1 shown in FIG. 2 and FIG. 6 includes a breathable water-repellent sheet 52, and urine and stool that partitions a space 46 formed between the skin contact sheet 24 and the top sheet 18 from the space on the front body 2 side. The urine / feces separation wall 48 has a separation wall 48, one end of the breathable water-repellent sheet 52 is joined to the front end portion of the skin contact sheet 24 (joint portion 62), and the other end is suspended to the surface of the top sheet 18, It is formed by joining (joining part 66). In this example, as shown in FIG. 4, the portion of the ventilated water-repellent sheet 52 that protrudes from the side edge of the absorber 22 is not fixed (joined) to the surface of the top sheet 18 but is simply suspended.

  In this example, the air permeable and water repellent sheet 52 is bent into a Z-shaped cross section, and the portions other than the joint portions 62 and 66 are not fixed. Therefore, as shown in FIG. The part stretches freely. Therefore, the urine / feces separation wall 48 has an advantage that the rise of the skin contact sheet 24 is hardly inhibited. However, in the disposable diaper of the present invention, the urine / feces separation wall is not an essential member and may not be disposed. That is, the space formed between the skin contact sheet and the top sheet may be opened forward.

  In the disposable diaper 1 shown in FIGS. 2 and 6, a space 46 formed between the skin contact sheet 24 and the top sheet 18 is opened toward the rear side, but a space behind the skin contact sheet 24. You may partition from. Thereby, the situation where a soft stool or watery stool wraps around the wearer's back and leaks from the opening around the waist can be effectively prevented. For example, it is possible to partition the space by forming the separation wall with the same configuration as the urine / feces separation wall or by fixing the rear end of the skin contact sheet to the top sheet.

  Moreover, in the disposable diaper 1 shown in FIG.2 and FIG.6, although the other end 56 of the ventilation water repellent sheet | seat 52 is being fixed to the surface of the top sheet 18, the disposable diaper of this invention is limited to such a form. It is not something. For example, it is possible to partition the space just by hanging a breathable water-repellent sheet with one end fixed to the skin contact sheet so as to cover a part of the surface of the top sheet, and the same effect as when the other end is fixed Can be obtained.

[1-2C] Stool passage opening:
As long as the feces passage opening has a shape capable of passing feces, there is no particular limitation on the shape. For example, a slit may be used in addition to a so-called opening (hole) such as a circle, an ellipse, or a rhombus. Examples of the slit include a straight shape (1), a cross shape (2), a star shape (3 or more), and the like. In these, the oval opening part which a stool passes easily, and the star-shaped slit which obstruct | occludes after a stool passage and does not pollute a wearer's buttocks are preferable.

  For example, the disposable diaper 1 shown in FIG. 2 has an elliptical opening having a major axis in the longitudinal direction of the diaper as a stool passing opening 28 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”.

In the disposable diaper of the present invention, an elastic material is disposed on the skin contact sheet . Specifically, opening stretchable member is disposed on the outer edge for stool passing opening. When the opening stretchable material is disposed, the skin contact sheet is difficult to fall to the top sheet side, and the skin contact sheet is easily brought into contact with the wearer's skin. In addition, it is possible to maintain the skin contact sheet floating from the top sheet and reliably separate the skin contact sheet and the top sheet .

  The material, stretch rate, and fixing method of the opening stretchable material are the same as those for the standing stretchable material. The opening expansion / contraction material is arranged in a pattern (circular, oval, rhombus, etc.) so that the opening expansion / contraction material surrounds the periphery of the opening in order to ensure that the expansion / contraction force acts on the opening. Is preferred.

In addition, two opening elastic members are used as the opening elastic members, the two opening elastic members intersect at at least one point before and after the opening, surround a part of the periphery of the opening , and the skin It is arranged to the rear end of the contact sheet . When the opening stretchable material is arranged in such a pattern, the opening stretchable material can be continuously arranged in the front-rear direction of the diaper, so that continuous production of the disposable diaper is facilitated.

  For example, the disposable diaper 1 shown in FIG. 2 uses two opening elastic members 30 a and 30 b as the opening elastic members 30, and the two opening elastic members 30 a and 30 b are on the front side of the stool passing opening 28. This is an example in which they are arranged in a pattern that intersects at a point P and surrounds a part of the periphery of the stool passage opening 28. 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.

  Further, the disposable diaper 1 shown in FIG. 2 is arranged in a pattern in which the opening elastic members 30a and 30b intersect at the center of the crotch part 4 and the periphery on the rear body 6 side of the stool passing opening 28 is opened. Has been. With such an arrangement, the skin contact sheet 24 has an effect of being relatively loosened among the skin contact sheets 24 and making the peripheral edge of the fecal passage opening 28 more closely contact the skin of the wearer. Since the body 6 side does not excessively adhere to the wearer's skin, air permeability can be ensured.

  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. When such an arrangement method is adopted, the skin contact sheet can be provided with an expansion / contraction force by a minimum necessary expansion / contraction material.

[1-3] 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.

  In the present invention, a pair of three-dimensional gathers that are three-dimensionally standing leak-proof walls are attached to a region further outside the standing line of the pair of skin contact sheet support walls on the surface of the top sheet. Preferably it is. In the disposable diaper of the present invention, a pair of three-dimensional gathers are preferably formed, but two or more pairs may be formed.

  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. 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.

  The three-dimensional gather is preferably formed over the entire area of both side edges of the absorbent body, but may be disposed at least in a portion corresponding to the crotch part of the diaper for the purpose of preventing side leakage of urine.

[1-4] 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.

[1-5] 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.

[1-6] 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.

[1-7] 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. 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.

[1-8] 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.

[1-9] 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 FIG. 1 and FIG. 2, a plurality of leg-around elastic members 40 are disposed on the periphery of the leg-hole openings 12 a and 12 b, and the waist-open opening 10 is provided on the periphery of the waist-open opening 10. A plurality of waist elastic members 42 are arranged so as to surround, and further, a portion between the waist opening 10 and the leg openings 12a and 12b (that is, a portion corresponding to the wearer's belly). This is an example in which a plurality of belly stretchable members 44 are arranged so as to surround the wearer's belly. Although not shown in FIG. 2, the leg-surround stretchable material 40 is arranged so as to draw a U shape on the front body 2 side and the back body 6 side, and is cut at the center of the crotch 4. Yes.

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

[2] 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 in the case 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 on the front side of the feces passage opening 28 to be formed later, surround a part of the periphery of the feces passage opening 28 , and skin Arrange to the rear edge of the contact sheet .

Next, the feces passage opening 28 is formed in the liner sheet 24b and the upper sheet 24a that are bonded together. By doing so, the two opening elastic members 30a, 30b intersect at a point P on the front side of the feces passage opening 28, and surround a part of the periphery of the feces passage opening 28 , and the skin contact sheet 24 A skin contact sheet 24 having a two-layer structure arranged to the rear end is obtained.

[2-3] Production of skin contact sheet support wall:
One end of the support wall forming sheet 32a (32b) is folded, and the folded contact portions are bonded together with two standing stretchable members 36a, 36b (36c, 36d) sandwiched therebetween, thereby supporting the skin contact sheet. The wall 26a (26b) is obtained.

[2-4] Attaching skin contact sheet etc. to absorbent main body:
The skin contact sheet 24 is bonded to the skin contact sheet support walls 26a and 26b. Thereafter, the skin contact sheet support walls 26a and 26b are fixed to the surface of the top sheet 18 constituting the absorbent main body 14, and the skin contact sheet support walls 26a and 26b are pasted so as to sandwich the side edges of the absorbent main body 14. In addition, a skin contact sheet 24 and skin contact sheet support walls 26 a and 26 b are attached to the absorbent main body 14.

[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. In addition, about the leg periphery elastic material 40, only the center part of the crotch part 4 is made into the non-adhesion state, and it snaps back by cut | disconnecting the non-adhesion part.

[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 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. And since the disposable diaper of this invention is excellent in the accommodation capacity of the excreted feces, it can be used especially suitably as a disposable diaper for adults with many amounts of excrement.

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 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 Y-Y 'line. It is a schematic sectional drawing which shows one use condition 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 Z-Z 'line. 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 A-A 'line. 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 AA 'line .

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, 24a: Upper sheet, 24b: Liner sheet , 26, 26a, 26b: skin contact sheet support wall, 28: stool passing opening, 30, 30a, 30b: opening stretchable material, 32, 32a, 32b: support wall forming sheet, 34: upper edge, 36, 36a, 36b, 36c, 36d: Stretching material for standing, 38: Standing wire, 40: Stretching material around the leg, 42: Stretching material around the waist, 44: Stretching material around the abdomen, 46: Space, 48: Urine / feces separation wall, 52 Breathable water repellent sheet, 54: one end, 56: the other end, 62 and 66: junction, P: a point.

Claims (4)

It is formed from each part of the front body, the crotch, and the back body,
An absorbent body, a top sheet that is at least partially made of a liquid-permeable material and arranged to cover the upper surface of the absorbent body, and a liquid-impermeable material that covers the lower surface of the absorbent body A back sheet, a stool passing opening formed, a skin contact sheet disposed above the top sheet, and a breathable water repellent sheet, formed between the skin contact sheet and the top sheet A urine / feces separation wall that partitions the space to be separated from the space on the front body side ,
A pair of skin contact sheet support walls that can stand up three-dimensionally are attached to the surface of the top sheet along each side edge of the absorber,
The skin contact sheet has an opening stretchable material disposed on an outer edge of the stool passing opening, and is disposed separately from the top sheet so that a front end is located above the crotch part of the top sheet. The top sheet is disposed so as to be separated from the top sheet so that an end portion is positioned above the back body of the top sheet, and is fixed so as to bridge between the pair of skin contact sheet support walls. Covering at least part of the crotch region and the back body region ,
The opening stretchable material comprises two opening stretchable materials, the two opening stretchable materials intersect at a point on the front side of the stool passing opening, and a part of the periphery of the stool passing opening And is arranged up to the rear end of the skin contact sheet,
The urine / feces separation wall is a disposable diaper formed by joining one end of the breathable water-repellent sheet to the front end of the skin contact sheet and hanging the other end to the surface of the top sheet .   The disposable diaper according to claim 1, wherein both side edges of the skin contact sheet are fixed to a portion between a standing line and an upper end edge of the skin contact sheet support wall. The disposable diaper according to claim 1 or 2 , wherein the skin contact sheet support wall is configured such that a standing stretchable material is disposed along the front-rear direction of the diaper. The pair of three-dimensional gathers which are the leak-proof wall which can stand in three dimensions are attached to the area | region further outside the standing line of the pair of skin contact sheet support wall among the surfaces of the top sheet. The disposable diaper as described in any one of ~ 3 .

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