JP4964708B2 - 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 urine / feces separation wall for individually collecting urine and feces excreted by the wearer.

  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.

  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.

  By the way, when urine and stool are mixed, ammonia is generated, this ammonia makes the environment alkaline, the enzyme in the stool is strongly activated in an alkaline atmosphere, and the weak part of the skin is inflamed by this enzyme and ammonia, Diaper rash is known to occur.

  Therefore, in the disposable diaper described in Patent Document 1, a weir is formed on the crotch part of the diaper by a top sheet or an absorbent body, or the thickness of the absorbent body is reduced from the crotch part of the diaper to the back body side to form a pocket part. Etc. are added.

JP 2002-11044 A (paragraphs 0044 to 0046, FIGS. 10 to 12)

  In the disposable diaper described in Patent Document 1, movement of the urine to the back body side and movement of the stool to the front body side are suppressed by the weir formed in the crotch part of the diaper. Moreover, the movement to the front body side of the stool is suppressed by the pocket part formed from the crotch part of the diaper to the back body side. Therefore, the urine excreted by the wearer and the stool are hardly mixed, and an effect of reducing diaper rash can be expected.

  However, although the disposable diaper described in Patent Document 1 can prevent the mixing of urine and feces to some extent, the disposable diaper is surely separated and absorbed and retained by the wearer's excreted urine and feces. There was a problem that urine and stool may be mixed. In other words, the urine and feces excreted by the wearer are surely separated and absorbed and retained, which is not fully satisfactory and still has problems to be solved.

  For this reason, the disposable diaper which can prevent mixing of urine and feces effectively is anxious. The present invention has been made to solve the problems of the prior art, and can reliably separate and absorb and retain the urine and feces excreted by the wearer, and the urine and feces are mixed. Disclosed is a disposable diaper that can effectively prevent the situation of being combined.

As a result of intensive studies to solve the problems of the prior art as described above, the present inventors have constituted a ventilation water-repellent sheet, and the space from the surface of the top sheet to the upper end of the three-dimensional gather is predecessor. A urine / feces separation wall that divides into a front side and a back body side , the ventilated water-repellent sheet is formed in a T shape, and the left and right ends of the T-shaped horizontal bar portion are paired from above the pair of three-dimensional gathers. Is joined to the upper end of the three-dimensional gather, and a foldable portion that can be expanded and contracted in the vertical direction is formed between the upper end and the lower end of the T-shaped vertical bar, and when the three-dimensional gather stands up, the folding portion extends, It discovered that the said subject could be solved by the disposable diaper in which a urine / feces separation wall is formed . That is, according to this invention, the following disposable diapers are provided.

[1] An absorber, disposed so as to cover the upper surface of the absorber, a top sheet made of at least a part of a liquid-permeable material, and disposed so as to cover the lower surface of the absorber, and impermeable to liquid A disposable diaper comprising a back sheet made of a conductive material , and a pair of three-dimensional gathers, which are three-dimensionally standing leak-proof walls, are formed on both sides of the top sheet, and are constituted by a breathable water-repellent sheet comprises a urine-feces separation wall that partitions a space from the surface of the top sheet up to the upper end of the standing gathers on the front body side and the back body side, the vent water repellent sheet is formed in a T-shape The T-shaped horizontal bar is formed wider than the distance between the pair of three-dimensional gathers in the folded state before standing, and the T-shaped vertical bar is the pair of three-dimensional solid in the folded state before standing. Gather The left and right end portions of the horizontal bar portion are joined to the upper end portions of the pair of three-dimensional gathers from the upper side of the pair of three-dimensional gathers, and the upper end portions of the vertical bar portions; A folding part is formed that is folded once or a plurality of times with the lower end part of the vertical bar part and can be expanded and contracted in the vertical direction, and the lower end part of the vertical bar part is superimposed on the top sheet, A disposable diaper in which, when the three-dimensional gather is erected, the folding portion extends to form the urine / feces separation wall .

  The disposable diaper of the present invention can reliably separate and absorb and retain the urine and feces excreted by the wearer, and can effectively prevent the situation where urine and feces are mixed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and changes, modifications, and improvements can be added without departing from the scope of the invention.

  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 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. The “two-piece type” means that the absorbent main body 14 that absorbs and retains the excrement of the wearer (absorption / retention function), like the disposable diaper 1 shown in FIG. It means a diaper of a type configured as a separate member separated from the exterior member 16 that has the function of encapsulating the body (mounting function). 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.

  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 is a disposable diaper provided with the absorber 22, the top sheet 18, and the back sheet | seat 20, like the disposable diaper 1 shown in FIGS. 3-5, On both sides of the top sheet 18, A pair of three-dimensional gathers 26, which are three-dimensionally standing leakage barriers, are formed along the longitudinal direction, and are constituted by a breathable water-repellent sheet, from the surface of the top sheet 18 to the upper end of the three-dimensional gather Is further provided with a urine / feces separation wall 48 that divides the space into the front body 2 side and the back body 6 side.

[1-1] Urine separation wall:
Urine-feces separation wall is a member for separating the urine and feces excreted the wearer, is constituted by a breathable water repellent sheet. By providing this urine / feces separation wall, the space from the top sheet surface to the upper end of the three-dimensional gather is partitioned into the front body side and the back body side with the urine / feces separation wall as a boundary, and the front body side Urine is induced in the space and feces in the space on the back body side. In addition, since the urine / feces separation wall is formed of a breathable water-repellent sheet, urine that has passed through the sheet and is guided to the front body side does not ooze out to the back body side. Therefore, mixing of urine and stool can be effectively prevented, and occurrence of diaper rash due to mixing of urine and stool is effectively suppressed.

  In the disposable diaper of the present invention, the urine / feces separation wall needs to be constituted by a breathable water-repellent sheet. Since the air-permeable and water-repellent sheet has low liquid permeability, it is possible to effectively prevent a situation in which urine or soft stool leaks out from the urine / feces separation wall and urine and stool are mixed. In addition, it is conceivable that the urine / feces separation wall is constituted by a liquid-impermeable sheet such as that used for a backsheet. However, when a liquid-impermeable sheet such as a plastic film is used, (1) There is a problem that stuffiness is likely to occur because it is not provided, and (2) the fit with the wearer's body is low due to poor flexibility and shape followability. Moreover, when it contacts a wearer's body, (3) There is also a possibility that the touch may be bad and the malfunction that the touch wet on the surface may remain easily occurs. Like the disposable diaper of the present invention, the urine / feces separation wall is made of a breathable water-repellent sheet, preventing the above-mentioned problems and making it difficult to mix the urine and feces excreted by the wearer. The effect can be exhibited.

  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.

  The ventilated water-repellent sheet can form a urine / feces separation wall by joining one end of the breathable water-repellent sheet to a three-dimensional gather and dropping the other end to the surface of the top sheet so as to overlap the surface of the top sheet. By joining one end of the breathable water repellent sheet to the three-dimensional gather in this way, it is possible to prevent urine and feces from moving through the space above the urine / feces separation wall. The other end of the water-repellent water-repellent sheet may be bonded to the top sheet surface to be joined, or may be configured to simply overlap the top sheet surface without being bonded to the top sheet surface. It is. When the other end of the breathable water-repellent sheet is joined to the top sheet, the urine / feces separation wall is firmly fixed without being displaced, so the space on the top sheet is the front body side and the back body side. It is surely partitioned.

For example, in the disposable diaper 1 shown in FIGS. 3 and 4, the ventilation water-repellent sheet 52 constituting the urine / feces separation wall 48 is formed in a T shape, and the T-shaped horizontal bar portion is folded before standing up. The T-shaped vertical bar portion is formed to be narrower than the interval between the pair of three-dimensional gathers 26 in the folded state before standing up. Then, the lateral bar portion of the left and right end portions 48t, 48t are joined to the upper end of the upper pair of standing gathers 26 of the pair of standing gathers 26, the lower end portion 56 of the vertical bar portion is superimposed on the top sheet 18 This is an example of joining.

The disposable diaper of the present invention has a urine / feces separation by increasing the distance (length in the longitudinal direction) between the upper end portion and the lower end portion of the T-shaped vertical rod portion of the breathable water-repellent sheet formed in a T-shape. The standing height of the wall can be increased, and the three-dimensional gather and the top sheet can be reliably separated from each other. In the present invention, the breathable water-repellent sheet formed in a T shape is folded once or a plurality of times between the upper end portion of the T-shaped vertical bar portion and the lower end portion of the vertical bar portion . With such a configuration, as shown in FIG. 5, the urine / feces separation wall 48 can be formed with a foldable portion that can be expanded and contracted in the vertical direction. This folded portion extends as the three-dimensional gather 26 stands up and the upper end of the three- dimensional gather 26 is separated from the surface of the top sheet 18 when the diaper is used, so that the standing height of the urine / feces separation wall 48 can be secured. It is. In addition, the formation of the folded portion is also preferable in that the urine / feces separation wall 48 hardly restrains the behavior of the three-dimensional gather 26.

  As a method of folding the breathable water repellent sheet, the cross section of the breathable water repellent sheet as viewed from the side is Z-shaped (folded twice), M-shaped (folded three times), and accordion (folded many times). And the like. For example, the disposable diaper 1 shown in FIG. 4 has a breathable water repellent sheet 52 after the breathable water repellent sheet 52 is folded so as to have a Z-shaped cross section (this folding may be referred to as “Z-fold”). In this example, one end 54 side of 52 is joined to the three-dimensional gather 26 and the other end 56 side is joined to the top sheet 18. In these examples, portions other than the one end 54 side and the other end 56 side of the ventilated water-repellent sheet 52 (for example, the folded portion) are not bonded to the three-dimensional gather 26 and the top sheet 18.

In the disposable diaper of the present invention, the space on the top sheet (the space between the upper end of the three-dimensional gather and the surface of the top sheet) may be partitioned into the front body side and the back body side. Does not need to be completely separated. For example, there are voids on both the left and right sides of the urine / feces separation wall 48, and the space 46 communicates between the front body side and the back body side. It has the effect of making it difficult to mix, and is included in the scope of the present invention. That is, when the diaper is worn, the absorbent body 22 is deformed so as to have a U-shaped cross section. Therefore, practically, feces and urine do not pass through this gap, and usually excreted urine is quickly absorbed. This is because there is almost no possibility that unabsorbed urine passes through the gap and flows into the space on the back body side because it is absorbed by the body.

  The disposable diaper of the present invention has a position where the breathable water-repellent sheet is joined to the three-dimensional gather and a position where it is superimposed on the top sheet (when it is joined to the top sheet, the position where it is joined to the top sheet; the same applies hereinafter). In other words, in other words, by shortening the distance in the front-rear direction of the diaper at both positions, the area where the top sheet surface is covered with the breathable water-repellent sheet can be reduced. In this way, the position where the breathable water-repellent sheet is joined to the three-dimensional gather and the overlapping position on the top sheet are close to each other (that is, the distance in the front-rear direction of the diaper at both positions is shortened), and the top sheet surface is ventilated. In order to prevent urine leakage, it is preferable to reduce the area covered with the water-repellent sheet.

  The overlapping length of the urine / feces separation wall and the top sheet (when the urine / feces separation wall and the top sheet are joined, the joint length of the two) is the same as the urine / feces separation wall. In this case, even if urine flows into the back body side of the urine / feces separation wall as a boundary, the urine can be reliably transferred to the absorber. Absorption can effectively prevent urine leakage. That is, as shown in FIG. 5, when the urine / feces separation wall 48 and the top sheet 18 are joined, the joining length La of the both is such that the absorber 22 on the back body side is separated from the urine / feces separation wall 48. When the length is less than or equal to ½ of the length Lb (La ≦ Lb / 2), the portion where the absorber 22 is covered by the urine / feces separation wall 48 is small. For this reason, even if urine flows into the back body side with the urine / feces separation wall 48 as a boundary, the urine can be absorbed by the absorber 22 to effectively prevent urine leakage. In particular, urine may flow into the back body side with the urine / feces separation wall 48 as a boundary due to a posture change or the like, which is effective in such a case.

  In this case, the length in the longitudinal direction of the top surface portion on one end side in the folded state of the urine / feces separation wall is more than 1/2 of the length of the absorber on the back body side with the urine / feces separation wall as a boundary. Long is desirable. That is, the joining length La between the urine / feces separation wall 48 and the top sheet 18 is ½ or less of the length Lb of the absorber 22 on the back body side, and the one end 54 side in the folded state of the urine / feces separation wall 48 When the length Lc in the longitudinal direction of the top surface portion 48a is longer than ½ of the length Lb of the absorber 22 on the back body side with the urine / feces separation wall 48 as a boundary (La ≦ Lb / 2, Lc> Lb / 2) is effective for separating the urine and stool disposed by the wearer by raising the urine / feces separation wall 48, but the urine travels through the top surface portion 48a and is behind the urine / feces separation wall 48. Although the possibility of flowing into the body side is increased, even in that case, the urine flowing into the back body side from the urine / feces separation wall 48 through the top surface portion 48a is surely absorbed by the absorbent body 22 to effectively prevent urine leakage. Can be prevented.

  On the other hand, the overlapping length of the urine / feces separation wall and the top sheet may be longer than ½ of the length of the absorber on the back body side with the urine / feces separation wall as a boundary. Even if urine that flows into the front body side through the urine / feces separation wall flows into the back body side from the urine / feces separation wall through the absorber, this urine is prevented from returning and the urine and feces excreted by the wearer are removed. Mixing can be prevented. That is, as shown in FIG. 5, when the urine / feces separation wall 48 and the top sheet 18 are joined, the joining length La of the both is such that the absorber 22 on the back body side is separated from the urine / feces separation wall 48. When the length is longer than ½ of the length Lb (La> Lb / 2), the absorber 22 is often covered with the urine / feces separation wall 48 and flows into the front body side with the urine / feces separation wall 48 as a boundary. Even if the collected urine flows into the back body side through the absorber 22 through the urine / feces separation wall 48, the urine / feces separation wall 48 prevents the urine from returning and the urine excreted by the wearer is mixed with the stool. Can be effectively prevented.

  In this case, the length in the longitudinal direction of the top surface portion on one end side in the folded state of the urine / feces separation wall is ½ or less of the length of the absorber on the back body side with the urine / feces separation wall as a boundary. It is desirable to be. That is, as shown in FIG. 5, the joining length La between the urine / feces separation wall 48 and the top sheet 18 is more than ½ of the length Lb of the absorber 22 on the back body side with the urine / feces separation wall 48 as a boundary. The length Lc in the longitudinal direction of the top surface 48a on the one end 54 side in the folded state of the urine / feces separation wall 48 is 1 / L of the length Lb of the absorber 22 on the back body side with the urine / feces separation wall 48 as a boundary. When it is 2 or less (La> Lb / 2, Lc ≦ Lb / 2), the width of the top surface portion 48a is narrow, and urine flows through the top surface portion 48a to the back body side from the urine / feces separation wall 48. However, on the other hand, even if a large amount of urine flows into the front body side of the urine / feces separation wall 48 and the urine flows into the back body side of the urine / feces separation wall 48 through the absorber 22, Is prevented by the urine / feces separation wall 48 and the urine excreted by the wearer is mixed with the stool. Results to be prevented.

  In the disposable diaper of the present invention, a part of the top sheet surface may be covered with the folded portion of the ventilated water-repellent sheet. Since the folded part of the ventilated water repellent sheet is not joined to the top sheet and can move freely, it is difficult to cause problems such as the absorption of urine into the absorber and the cause of urine leakage as already described. Because.

  In the disposable diaper of this invention, it is preferable to arrange | position a urine / feces separation wall in a crotch lower part, and it is still more preferable to arrange | position in the part which can contact | abut to a wearer's perineum. By disposing the urine / feces separation wall in such a portion, it becomes possible to reliably separate the urine and feces excreted by the wearer. For example, the disposable diaper 1 shown in FIG. 4 is an example in which a urine / feces separation wall 48 is disposed on a crotch part 4 of the diaper, more specifically, a portion that can come into contact with the perineum of the wearer.

The length of the ventilated water-repellent sheet constituting the urine / feces separation wall is not particularly limited. The height of the urine / feces separation wall (interval between the three-dimensional gather and the top sheet), the size of the folded portion, and the joining A desired length may be used in consideration of the position and the like.
[1-2] 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.

[1-3] 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. Since the top sheet needs to absorb the wearer's urine in the absorber disposed on the lower surface side thereof, at least a part (the whole or a part thereof) is made of a liquid-permeable material.

  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.

[1-4] 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.

[1-5] 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.

[1-6] 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 FIG. 2, the exterior member 16 is composed of two nonwoven fabrics, and the leg elastic member 40, the waist elastic member 42, and the belly elastic member 44 are sandwiched between the two nonwoven fabrics. This is a fixed example.

[1-7] Various elastic materials:
In a pants-type disposable diaper, it is common to arrange an elastic material around the legs, arrange an elastic material around the waist, and more preferably arrange an elastic material around the abdomen.

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

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

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

  In the disposable diaper 1 shown in FIGS. 1 and 2, a plurality of leg-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.

[1-8] 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 such a three-dimensional gather, urine is excreted on the top sheet, and even if the urine spreads through the top sheet, the three-dimensional gather becomes a breakwater, and the diaper leg opening 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 stretchable material (three-dimensional gather stretchable material) disposed on a part of the ventilated water-repellent sheet, and a sheet (gather) formed on the sheet material by the three-dimensional gather stretchable material.

  The disposable diaper 1 shown in FIGS. 2 and 3 has sheet materials 32 a and 32 b that are completely different from the top sheet 18 and the back sheet 20 attached to both side edges of the absorbent main body 14 and three-dimensionally from the standing line 38. In this example, a pair of solid gathers 26a and 26b is formed by using a structure that can stand up. In this example, the end portions of sheet materials 32a and 32b (the end portions corresponding to the upper end edges 34 of the three-dimensional gathers 26a and 26b) are folded back, and two three-dimensional gather expansion / contraction materials 36a and 36b or three-dimensional gathers are formed at the folded portions. It arrange | positions so that the expansion-contraction materials 36c and 36d may be inserted | pinched.

  In addition, the example of the cross-sectional shape of the three-dimensional gather for joining the urine / feces separation wall of this invention is shown in FIG. FIG. 6A shows an example in which the cross-sectional shape of the three-dimensional gather 26 is formed in a T shape by a top surface portion 26t and a wall portion 26s standing in a standing state below the top surface portion 26t. Further, FIG. 6B is an example in which the inside and outside of the shape is connected to the inside of the top surface portion 26t and spreads outward, and FIG. 6C is an example in which the cross section is formed in an M shape. The shape of the three-dimensional gather is not limited to these embodiments, and the urine / feces separation wall can be joined as long as it has a top surface portion.

[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 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.

[2-3] Attachment of a breathable water-repellent sheet to the absorbent main body:
The lower end portion 56 of the T-shaped vertical bar portion of the T-shaped breathable water-repellent sheet 52 is attached to the surface of the top sheet 18 constituting the absorbent main body 14 and bonded and fixed (bonded portion 66). This fixing is performed by a conventionally known bonding method used when manufacturing disposable diapers, such as bonding with an adhesive such as a hot melt adhesive, heat sealing, ultrasonic sealing, heat bonding with an embossing roll, or pressure bonding. be able to.

As described above, after the bottom end portion 56 of the T-shaped vertical bar portion of the breathable water-repellent sheet 52 is bonded to the surface of the top sheet 18, the three-dimensional gathers 26 a and 26 b so as to sandwich the side edge of the absorbent main body 14. Paste together. Then, the left and right end portions 48t, 48t of the T-shaped horizontal bar portion of the ventilated water-repellent sheet 52 are attached to the three-dimensional gather 26 and bonded and fixed (bonded portion 62). This fixing is used when producing disposable diapers, such as bonding with an adhesive such as a hot melt adhesive, heat bonding with heat sealing, ultrasonic sealing, embossing roll, pressure bonding, etc., as with the joint 66. It can carry out by the conventionally well-known joining method. At this time, when the breathable water repellent sheet has a structure that is folded once or plural times between the joints 62 and 66 at both ends ( between the upper end and the lower end of the T-shaped vertical bar) , This is preferable because the standing height of the urine / feces separation wall can be increased. The disposable diaper 1 shown in FIG. 4 is an example in which the breathable water-repellent sheet 52 is Z-folded and folded twice.

In the above method, after gathering the lower end portion 56 of the T-shaped vertical bar portion of the ventilation water-repellent sheet 52 on the surface of the top sheet 18, the three-dimensional gathers 26a and 26b are sandwiched between the side edges of the absorbent main body 14. Then, the right and left end portions 48t, 48t of the T-shaped horizontal bar portion of the vent water-repellent sheet 52 are joined to the three-dimensional gather 26, and the vent water-repellent sheet 52 is attached to the absorbent main body 14. This is not the case. For example, after the three-dimensional gathers 26 a and 26 b are bonded so as to sandwich the side edge of the absorbent main body 14, the lower end portion 56 of the T-shaped vertical bar portion of the ventilation water-repellent sheet 52 is bonded to the surface of the top sheet 18. At the same time, the right and left end portions 48t, 48t of the T-shaped horizontal bar portion of the ventilated water repellent sheet 52 may be joined to the three-dimensional gather 26 to attach the ventilated water repellent sheet 52 to the absorbent main body 14. Further, after bonding the three-dimensional gathers 26 a and 26 b so as to sandwich the side edge of the absorbent body 14, the left and right end portions 48 t and 48 t of the T-shaped horizontal bar portion of the ventilation water-repellent sheet 52 are bonded to the three-dimensional gather 26. In addition, the lower end portion 56 of the T-shaped vertical bar portion of the ventilated water-repellent sheet 52 is simply hung down without being attached to the surface of the topsheet 18 and is superposed on the surface of the topsheet 18. The lower end portion 56 of the T-shaped vertical bar portion and the top sheet 18 may be in contact with each other.

[2-4] 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.

[2-5] Manufacture of disposable diapers:
The absorbent main body 14 is disposed and fixed near the crotch part of the exterior member 16. Next, the absorbent body 14 is turned inside, and the front body 2 and the back body 6 are folded in two so that the front body 2 and the back body 6 are matched, and the front body 2 and the back body 6 are joined by means such as heat sealing to form the joint 8. By doing, the disposable diaper 1 shown in FIGS. 1-4 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.

  “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 can effectively prevent urine and stool from being mixed together, and the occurrence of diaper rash due to the mixture of urine and stool is effectively suppressed. It is particularly suitable as a disposable diaper for infants with weak skin and many skin troubles.

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 perspective view which shows one Embodiment of the disposable diaper of this invention. 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 Y-Y 'line. It is a partially expanded sectional view which shows the cross section which expanded a part of disposable diaper of this invention, and is a partially expanded sectional view which shows the cross-sectional shape of a solid gather.

Explanation of symbols

1: diaper, 2: front body, 2a: side edge, 2b: side edge, 6: back body, 6a: side edge, 6b: side edge, 8: joint, 10: opening around the waist, 12a, 12b: leg opening, 14: absorbent main body, 16: exterior member, 18: top sheet, 20: back sheet, 22: absorber, 26: solid gather, 26s: wall, 26t: (solid gather) 40) leg elastic material, 42: elastic material around waist, 44: elastic material around waist, 46: space, 48: urine / feces separation wall, 48a: top surface portion (of urine / feces separation wall), 48t : Left and right end portions of T-shaped horizontal bar portion , 52: breathable water-repellent sheet, 54: one end, 56: lower end portion of T-shaped vertical bar portion , 62: joined portion, 66: joined portion.

Claims (1)

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
A pair of three-dimensional gathers are formed on both sides of the top sheet, which are three-dimensionally standing leakage barriers,
Consists of a breathable water repellent sheet, comprising a urine / feces separation wall that partitions a space from the top sheet surface to the upper end of the three-dimensional gather into a front body side and a back body side,
The ventilated water repellent sheet is formed in a T shape,
The T-shaped horizontal bar portion is formed wider than the interval between the pair of three-dimensional gathers in the folded state before standing.
The T-shaped vertical bar is formed narrower than the distance between the pair of three-dimensional gathers in the folded state before standing,
The left and right end portions of the horizontal bar portion are joined to the upper ends of the pair of solid gathers from the upper side of the pair of solid gathers,
A foldable portion is formed that is folded once or a plurality of times between the upper end portion of the vertical bar portion and the lower end portion of the vertical bar portion and can be expanded and contracted in the vertical direction, and the lower end portion of the vertical bar portion is Superimposed on the top sheet,
A disposable diaper in which, when the three-dimensional gather is erected, the folding portion extends to form the urine / feces separation wall .

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