JP4627503B2 - Disposable diapers - Google Patents

Description

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

  In recent years, as a diaper for infants or elderly people / handicapped persons, an absorbent body, a top sheet that is arranged so as to cover the upper surface of the absorbent body, and at least partially made of a liquid-permeable material, and a lower surface of the absorbent body Disposable diapers that are arranged so as to cover the back and are provided with a back sheet made of a liquid-impermeable material are widely used. By using the disposable diaper so that the surface of the top sheet is in contact with the skin of the wearer, the urine excreted by the wearer permeates the top sheet and is absorbed and held by the absorber. In addition, the back sheet excellent in leakage prevention prevents the excrement from leaking to the outside of the diaper (see, for example, Patent Document 1).

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

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

  In the disposable diaper as described in Patent Document 2, since the skin contact sheet first comes into contact with the skin of the wearer, the top sheet disposed at the lower part of the skin contact sheet is difficult to directly contact the wearer's skin. Become. 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.

  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, It has been reported that diaper rash occurs (for example, see Non-Patent Document 1).

  Therefore, the liquid-absorbent core interposed between the top sheet and the back sheet is composed of an upper layer core and a lower layer core that are divided into two in the thickness direction, and the upper core is divided into two in the front-rear direction. A disposable diaper is disclosed in which a front core and a rear core are arranged with a predetermined dimension apart from each other, and a stool holding pocket is formed by folding a surface sheet between the upper layer core and the lower layer core. (For example, refer to Patent Document 3).

  In addition, a liquid-impervious stool holding bag is formed of a top sheet, a back sheet, and a liquid-absorbent core interposed therebetween, and forms an opening that penetrates these members. The disposable diaper attached to the outer surface of the back sheet is disclosed (see, for example, Patent Document 4).

Japanese Patent No. 2572744 (FIG. 3) Utility Model Registration No. 2559050 (paragraph 0010, FIG. 2) Japanese Patent No. 3130438 (paragraph 0012, FIG. 2) JP 2003-190208 A (paragraph 0007, FIG. 4) Kazuya Yamamoto, Dermatology 30, p. 949-956 (1998)

  In the disposable diaper described in Patent Document 3, movement of the stool toward the front body side is suppressed by the stool holding pocket. On the other hand, the disposable diaper described in Patent Document 4 can capture stool by a space formed by extending a bowl-like liquid-impervious sheet. Therefore, the urine excreted by the wearer and the stool can be separated and absorbed and held, and the urine excreted by the wearer and the stool can be made difficult to be mixed. Therefore, an effect of reducing diaper rash can be expected.

  However, the disposable diaper described in Patent Document 3 or 4 has a problem in that since the structure of the stool holding pocket and the stool holding bag is complicated, the number of constituent members and manufacturing processes of the diaper increases, and the manufacturing becomes cumbersome. was there. That is, it is not fully satisfactory in terms of providing a disposable diaper that is simple in structure and easy to manufacture, and still has problems to be solved.

  Thus, at present, there is no disclosure of a disposable diaper that can effectively prevent mixing of urine and feces, and has a simple structure and is easy to manufacture, and such a disposable diaper is eagerly desired. ing. The present invention has been made to solve such problems of the prior art, and can separate and absorb and retain the urine and stool excreted by the wearer, and the urine and stool are mixed together. In addition to being able to effectively prevent such a situation, a disposable diaper having a simple structure and easy to manufacture is provided.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventors have divided the absorber into a front body side and a back body side, and also absorbed a part of the backsheet. The present invention has been completed by conceiving that the above-mentioned problems can be solved by forming a stool catching bag by slackening between the bodies. Specifically, the following disposable diapers are provided by the present invention.

[1] An absorber, disposed so as to cover the upper surface of the absorber, a top sheet made of at least a part of a liquid-permeable material, and disposed so as to cover the lower surface of the absorber, and impermeable to liquid A disposable diaper provided with a back sheet made of a functional material, wherein the absorbent body comprises at least two absorbent bodies, a front absorbent body disposed on the front body side and a rear absorbent body disposed on the rear body side. The back sheet is configured to continuously cover a lower surface of the front absorbent body and a lower surface of the rear absorbent body, and a slack portion in a region between the front absorbent body and the rear absorbent body The stool is captured in a region between the front absorbent body and the rear absorbent body by sealing both side edges of the slack portion and forming a bag shape. A stool catch bag is formed for Discarded diapers.

[2] The top sheet continuously covers the upper surface of the front absorbent body and the upper surface of the rear absorbent body, and has a slack portion in a region between the front absorbent body and the rear absorbent body. The disposable diaper according to [1], wherein the disposable diaper is arranged so as to be formed.

[3] The disposable diaper according to [1] or [2], further including a skin contact sheet disposed on an upper part of the top sheet and having an opening (stool passing opening) through which feces can pass. .

[4] The skin contact sheet is formed with a urine passage opening, and is disposed in a space between the skin contact sheet and the top sheet. The space is divided into a front body side and a back body side. A urine / feces separation wall that partitions the urine / feces separation wall, the urine / feces separation wall disposed between the stool passage opening and the urine passage opening, and the space passing through the stool passage opening and the stool trap The disposable diaper according to any one of [1] to [3], wherein the disposable diaper is partitioned into a space communicating with the opening of the bag and a space communicating with the urine passage opening.

  The disposable diaper of the present invention can 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, Simple and easy to manufacture.

  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. And the “two-piece type” means an absorbent main body 14 that functions to absorb and retain the excrement of the wearer (absorption / holding function) and a function (wearing function) that encapsulates the wearer's body. It shall consist of the exterior member 16 to bear, and shall mean the diaper of the type by which the absorptive main body 14 was arrange | positioned inside the exterior member 16. FIG. As shown in FIG. 3, the absorbent main body 14 is a member that includes an absorbent body 22, a top sheet 18, and a back sheet 20 as constituent elements.

  In addition, in this specification, “front body” means a part that covers the abdomen (front of the body) of the wearer when a diaper is worn on the wearer, and “inseam” means that the wearer wears a diaper. When the wearer wears a diaper, the part covering the inseam of the wearer means the part covering the back side (back of the body) of the wearer.

[1] Configuration of the disposable diaper of the present invention:
The disposable diaper of this invention is a disposable diaper provided with the absorber 22, the top sheet 18, and the back seat | sheet 20, like the disposable diaper 1 shown in FIGS. 1-6, The absorber 22 is the front body. The back sheet 20 is composed of at least two absorbers, a front absorbent body 22a disposed on the second side and a rear absorbent body 22b disposed on the rear body 6 side, and the back sheet 20 includes a lower surface of the front absorbent body 22a and a rear absorbent body. The lower surface of 22b is continuously covered, and a slack portion 54 is formed in a region between the front side absorber 22a and the rear side absorber 22b, and both side edges of the slack portion 54 are arranged. Is formed into a bag shape, whereby a stool capturing bag 50 for capturing stool is formed in a region between the front absorbent body 22a and the rear absorbent body 22b.

[1-1] 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.

  In the disposable diaper of this invention, the absorber needs to be comprised from the at least 2 absorber of the front side absorber arrange | positioned at the front body side, and the back side absorber arrange | positioned at the back body side. By doing so, it is possible to form a stool capturing bag for capturing stool in a region between the front absorbent body and the rear absorbent body.

  The shape and the like of the front absorbent body and the rear absorbent body are not particularly limited. However, since it is necessary to form an opening for the stool catching bag in the region between the front absorbent body and the rear absorbent body, it may be used for infant diapers. For example, it is preferable that both absorbers are arranged 20 to 150 mm apart and more preferably 30 to 100 mm apart when the diaper is worn.

  Moreover, it is preferable that the area between the front absorbent body and the rear absorbent body is disposed at a position in contact with the wearer's anus, and when a skin contact sheet described later is provided, It is preferable to arrange in the region directly below the fecal passage opening. By arranging the region at such a position, it is possible to form an opening of the stool catching bag at that position, and the stool capture efficiency can be improved. For example, in the disposable diaper 1 shown in FIGS. 5 and 6, a region between the front absorbent body 22 a and the rear absorbent body 22 b is arranged in a region immediately below the fecal passage opening 28 a of the skin contact sheet 24. This is an example of the configuration.

  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. The disposable diaper of the present invention includes at least two absorbers, ie, a front absorbent body and a rear absorbent body, and the at least two absorbent bodies are encased by a continuous hydrophilic sheet and are integrally formed. The form is also one of the preferred forms. For example, the front absorbent body and the rear absorbent body may be continuously wrapped by two upper and lower hydrophilic sheets (such as tissue), and may be configured integrally.

  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.

[1-2] 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.

  As long as the top sheet is arranged so as to cover the upper surface of the absorbent body, the form thereof is not particularly limited. Therefore, you may comprise so that each of a front side absorber and a back side absorber may be coat | covered with the separate top sheet (namely, at least 2 top sheet). However, the disposable diaper of the present invention continuously covers the upper surface of the front absorbent body and the upper surface of the rear absorbent body, and a slack portion is formed in a region between the front absorbent body and the rear absorbent body. It is preferable that they are arranged as described above.

  With the configuration as described above, only one top sheet may be used, and the number of parts of the diaper can be reduced, and the attaching operation, that is, making the diaper easier. it can. For example, in the disposable diaper 1 shown in FIGS. 5 and 6, the top sheet 18 is formed of a single sheet material, and the top sheet 18 is continuous with the upper surface of the front absorbent body 22a and the upper surface of the rear absorbent body 22b. This is an example in which coating is performed. In the disposable diaper 1, the top sheet 18 is disposed so that a slack portion 54 is formed in a region between the front absorbent body 22a and the rear absorbent body 22b.

  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.

[1-3] 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.

  In the disposable diaper of the present invention, the back sheet continuously covers the lower surface of the front absorbent body and the lower surface of the rear absorbent body, and a slack portion in a region between the front absorbent body and the rear absorbent body. It is necessary to arrange | position so that may be formed. With such a configuration, it becomes possible to form a bag shape by sealing both side edges of the slack portion, and form a stool capturing bag for capturing stool in a region between the front absorbent body and the rear absorbent body can do. In addition, since the stool catching bag is formed by a part of the back sheet, a part for forming the bag is not required separately, and the number of parts is not increased. That is, the structure of the diaper is simple and its manufacture is easy.

  For example, in the disposable diaper 1 shown in FIGS. 5 and 6, the back sheet 20 is constituted by a single sheet material, and the back sheet 20 is continuous with the lower surface of the front absorbent body 22a and the lower surface of the rear absorbent body 22b. This is an example in which coating is performed. In this disposable diaper 1, the back sheet 20 is arranged so that a slack portion 54 is formed in a region between the front absorbent body 22a and the rear absorbent body 22b, and although not shown, Both sides are sealed to form a bag.

  In order to form the slack portion, it is necessary to make the back sheet longer than the slack portion. Specifically, the length of the back sheet is preferably 60 to 550 mm longer than usual, and more preferably 120 to 300 mm longer.

  In order to use a back sheet that is longer than usual as a stool catching bag, it is necessary to seal both side edges of the slack portion to form a bag. By doing so, it is possible to form a stool catching bag in a region between the front absorbent body and the rear absorbent body. The method for sealing both side edges of the slack portion is not particularly limited as long as feces can be captured without omission, but for example, heat sealing, heat embossing, welding by ultrasonic (ultrasonic) or It is preferable to seal liquid-tightly by a method such as a combination thereof. For example, the disposable diaper 1 shown in FIG. 3 wraps both side edges of the top sheet 18 and the back sheet 20 with sheet materials 32a and 32b constituting the three-dimensional gathers 26a and 26b, and wraps the both side edges with a hot melt adhesive. This is an example of sealing by using a combination of adhesion by Ultrasonic and welding by Ultrasonic.

  In the disposable diaper configured as described above, a gap corresponding to the height of the absorbent body 22 is formed in the planar state as shown in FIG. 5, but as shown in FIG. The gap between the slack portion 54 of the back sheet 20 (that is, the folded portion of the back sheet 20) is widened by the difference in rigidity between the absorber 22 and the back sheet 20, and a space is formed in the front-rear direction of the slack portion 54. . Therefore, the internal space of the stool capturing bag 50 is formed by the gap corresponding to the height of the absorber 22 and the space in the front-rear direction of the slack portion 54, and the stool excreted by the wearer is captured in the internal space.

  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. For example, the disposable diaper 1 shown in FIGS. 1 and 3 to 6 uses the exterior member 16 in which the through hole 56 is formed in the crotch part 4 and causes the slack portion 54 of the backsheet 20 to bulge from the through hole 56. In this example, the cover sheet 58 is bonded to the lower surface side of the back sheet 20, and the lower surface of the back sheet 20 is covered with the cover sheet 58. By carrying out like this, the touch (tactile feeling) of a diaper can be improved compared with the case where the back seat | sheet 20 is exposed directly.

  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.

[1-4] 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.

[1-5] 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, the disposable diaper 1 shown in FIGS. 1 and 2 is an example in which the exterior member 16 is composed of two nonwoven fabrics, and the waist elastic member 42 and the belly elastic member 44 are sandwiched and fixed between the two nonwoven fabrics. It is.

  In the disposable diaper of the present invention, at least the back sheet is disposed so as to form a slack portion, and therefore the exterior member may be configured to wrap around the slack portion. However, the disposable diaper of the present invention preferably uses an exterior member having a through-hole formed in the crotch portion and bulges the slack portion of the backsheet from the through-hole. By carrying out like this, compared with the case where an exterior member is comprised along the three-dimensional shape of a slack part, it becomes possible to manufacture a diaper more simply. For example, in the disposable diaper 1 shown in FIGS. 1, 4, and 5, a through hole 56 is formed in the crotch portion 4 of the exterior member 16, and the slack portion 54 of the backsheet 20 is bulged from the through hole 56. This is an example configured as described above.

[1-6] Skin contact sheet:
The disposable diaper of the present invention is preferably further provided with a skin contact sheet that is disposed on the top of the top sheet and has an opening (stool passing opening) through which feces can pass. The skin contact sheet is a sheet-like member for separating the wearer's skin and the top sheet. By providing this skin contact sheet, the skin contact sheet first comes into contact with the skin of the wearer, and therefore the top sheet disposed at the lower part of the skin contact sheet is difficult to directly contact the wearer's skin. That is, the wearer's skin and the top sheet are separated from each other. In addition, a shielding layer called a skin contact sheet is interposed between the top sheet and the wearer's skin. Therefore, even if the stool remains on the top sheet, it is possible to greatly reduce the chance that the stool and the skin of the wearer are in direct contact.

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

  However, in the disposable diaper of the present invention, it is preferable that at least a part of the skin contact sheet is constituted by a breathable water-repellent sheet. About the part comprised with the ventilation | gas_flowing water-repellent sheet, the permeation | transmission of a liquid can be reduced not to mention that the dry touch (dryness) can be maintained even when it wears for a long time. Therefore, once the urine or soft stool that has passed through the skin contact sheet and led to the top sheet oozes out of the skin contact sheet and adheres to the skin of the wearer (so-called “urine return, stool return”) It becomes possible to prevent. For example, the disposable diaper 1 shown in FIGS. 3 to 6 is an example in which an upper sheet 24a which is a part of the skin contact sheet 24 is formed of a breathable water repellent sheet. In addition, all the skin contact sheets may be comprised by the ventilation water-repellent sheet.

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

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

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

  For example, the disposable diaper 1 shown in FIG. 2 has a stool passing opening 28a generally having a bowl shape, and has a shape in which a part of the front region has an outer edge projecting to the left and right. That is, since the protruding portion is the maximum opening, the disposable diaper 1 is formed in a shape in which the opening area of the rear region is smaller than the opening area of the front region of the feces passage opening 28a. It is formed in a shape having a maximum opening in the front region. In the present specification, the “center line in the front-rear direction” means a straight line extending in the left-right direction of the diaper from the midpoint of the straight line connecting the front end and the rear end of the feces passage opening 28a.

  The skin contact sheet may be formed with an opening (urine passing opening) through which urine can pass through the front body side of the opening. That is, it is preferable that the skin contact sheet is formed with a fecal passage opening and a urine passage opening as openings.

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

  In the disposable diaper of the present invention, when two openings as described above (a stool passage opening and a urine passage opening) are formed, the disposable diaper is disposed in a space between the skin contact sheet and the top sheet. It is preferable to further include a urine / feces separation wall that partitions the space into a front body side and a back body side.

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

  In particular, in the disposable diaper of the present invention, the urine / feces separation wall is disposed between the stool passage opening and the urine passage opening, and the stool passage opening is formed in the space between the skin contact sheet and the top sheet. And a space communicating with the opening of the stool capture bag and the opening of the stool capturing bag and a space communicating with the urine passage opening. Such a structure is preferable in that the urine and feces excreted by the wearer are reliably separated and absorbed and retained.

  For example, the disposable diaper 1 shown in FIGS. 3, 5, and 6 includes a urine / feces separation wall 48 formed by a breathable water-repellent sheet 52, and the urine / feces separation wall 48 is used as a stool of the skin contact sheet 24. The space 46 between the skin contact sheet 24 and the top sheet 18 is disposed between the stool passage opening 28a and the stool catching bag 50 between the passage opening 28a and the urine passage opening 28b. This is an example of partitioning into a communicating space and a space communicating with the urine passage opening 28b.

  In this example, the breathable water-repellent sheet 52 is bent so that it has a Z-shaped cross section, and then one end of the breathable water-repellent sheet 52 is joined to the skin contact sheet and the other end is joined to the top sheet 18. The portion (for example, the bent portion) is in a non-joined state. With such a configuration, the urine / feces separation wall 48 can form a fold that can be expanded and contracted in the vertical direction, so that the urine / feces separation wall 48 rarely restrains the behavior of the skin contact sheet 24. Therefore, the skin contact sheet 24 can be more closely attached to the wearer's body.

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

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

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

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

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

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

  The opening stretchable material as described above is fixed to the skin contact sheet by an adhesive or other means. The fixing method may be, for example, adhesion using a hot melt adhesive or other highly fluid adhesive, or may be welding by heat such as heat sealing or ultrasonic waves.

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

  The arrangement method of the opening stretchable material is not particularly limited. For example, as in the disposable diaper 1 shown in FIGS. 3 and 4, the skin contact sheet 24 is bonded with two sheet materials (upper sheet 24 a and liner sheet 24 b). It is preferable to arrange them so that the opening elastic members 30a and 30b are sandwiched between the upper sheet 24a and the liner sheet 24b. Employing such an arrangement method is preferable because the skin contact sheet can be stretched with the minimum necessary stretch material.

  As a method for fixing the skin contact sheet, (1) like the disposable diaper 1 shown in FIGS. 3 and 4, sheet materials 32a and 32b constituting the three-dimensional gathers 26a and 26b and the top sheet 18 (or the back sheet 20) A method of fixing the skin contact sheet 24 so as to be sandwiched between the pasted portions of (2), and (2) a skin contact on the inner surface of the three-dimensional gather between the upper edge and the lower end edge (standing line) of the three-dimensional gather The method of fixing a sheet | seat etc. can be mentioned. Moreover, you may fix a skin contact sheet to the inner area | region enclosed by the solid gather which becomes a pair, without making it contact with a solid gather. For example, (3) a method of fixing the skin contact sheet to a bonded portion (so-called flap portion) of the top sheet and the back sheet of the absorbent main body in the region surrounded by the three-dimensional gather can be exemplified. Among these methods, the method (1) is preferable in that the effect of closely attaching the skin contact sheet to the wearer's skin is high.

[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.

  The disposable diaper 1 shown in FIGS. 1 and 2 has a plurality of waist elastic members 42 arranged around the waist opening 10 at the periphery of the waist opening 10, and further, the waist opening. A plurality of abdominal circumference elastic members 44 are arranged so as to surround the circumference of the wearer's abdomen (ie, the part corresponding to the circumference of the wearer's abdomen) between 10 and the leg circumference openings 12a and 12b. It is an example.

  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:
In order to prevent side leakage of urine excreted by the wearer, a three-dimensional gather may be provided. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, urine is excreted on the skin contact sheet, and even if the urine diffuses through the skin contact sheet, the three-dimensional gather becomes a breakwater, and the opening around the leg of the diaper Etc. (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, a stretchable material (a three-dimensional gathered stretchable material) disposed on a part of the water-repellent sheet material and a sheet (gather) formed on the sheet material by the three-dimensional gathered stretchable material can be suitably used.

  The disposable diaper 1 shown in FIG. 2 to FIG. 6 has a sheet material 32a, 32b that is completely separate from the top sheet 18 and the back sheet 20, and is bonded to both side edges of the absorbent main body 14 in a three-dimensional manner 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 ends of the sheet materials 32a and 32b (the ends corresponding to the upper edge 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.

[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.

  At this time, as the back sheet 20, a back sheet configured to be 170 mm longer than a normal length is used and disposed so that the slack portion 54 is formed. Further, the top sheet 18 has the same configuration as the back sheet 20. That is, as the top sheet 18, a top sheet configured to be 170 mm longer than a normal length is used and arranged so that a slack portion is formed. Moreover, as the absorber 22, the two absorbers of the front side absorber 22a and the back side absorber 22b are used, the front side absorber 22a is arrange | positioned at the front body 2 side, and the back side absorber 22b is arrange | positioned at the back body 6 side. . And it comprises so that the slack part 54 may be arrange | positioned in the area | region between this front side absorber 22a and the back side absorber 22b. Both side edges of the slack portion 54 of the backsheet 20 are sealed in a liquid-tight manner by using a hot melt adhesive and an ultrasonic welding together to form a stool catching bag 50.

[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. The upper sheet 24a is configured to cover only the center region of the liner sheet 24b and to expose both side regions of the liner sheet 24b. The two opening elastic members 30a and 30b intersect at a point P between the feces passage opening 28a and the urine passage opening 28b, which will be formed later, and the feces passage opening 28a and the urine passage opening. It arrange | positions in the pattern which surrounds a part of periphery of the opening part 28b.

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

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

[2-4] Attaching skin contact sheet etc. to absorbent main body:
After the skin contact sheet 24 (liner sheet 24b) is bonded to the surface of the top sheet 18 constituting the absorbent main body 14, the side edges of the absorbent main body 14 and the skin contact sheet 24 (liner sheet 24b) are sandwiched. The solid gathers 26a and 26b are bonded together.

[2-5] Production of exterior member:
First, two nonwoven fabrics to be the exterior member 16 are prepared, and a waist elastic member 42 and an abdominal elastic material 44 are arranged and bonded and fixed on the upper surface of one of these nonwoven fabrics. Then, another non-woven fabric is laminated and fixed on the upper surface to obtain the exterior member 16 in which the waist stretchable material 42 and the belly stretchable material 44 are interposed between the two nonwoven fabrics. About this exterior member 16, the through-hole 56 for inflating the stool capture bag 50 is formed.

[2-6] Manufacture of disposable diapers:
The absorbent main body 14 is disposed and fixed near the crotch part of the exterior member 16. At this time, the stool capturing bag 50 is inflated from the through hole 56 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. 1-6 can be manufactured.

[3] Application target of the present invention:
The application object of the disposable diaper of this invention is not restricted to the said 2 piece type underpants type diaper, For example, it can apply also to a 1 piece type underpants type diaper and a tape type diaper. That is, also in these disposable diapers, the effect of the disposable diaper of the present invention can be enjoyed by disposing the skin contact sheet above the surface of the top sheet and forming at least a pair of three-dimensional gathers.

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

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

  The disposable diaper of the present invention can be suitably used as a diaper for infants or for adults such as elderly people and persons with disabilities who need care. The disposable diaper of the present invention is particularly suitable as a disposable diaper for infants, because the excreted stool is less likely to come into direct contact with the wearer's skin and there is little stool return or urine return. Can be used.

It is a schematic perspective view which shows one Embodiment of the disposable diaper of this invention, and is a schematic perspective view which shows the state seen from the front of a diaper. It is a top view which shows one Embodiment of the disposable diaper of this invention, is a top view which expand | deploys the disposable diaper shown in FIG. 1, and shows the state seen from the absorptive main body side of the diaper. It is a schematic sectional drawing which shows one Embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper shown in FIG. 2 along the X1-X1 '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 X2-X2 '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 Embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section cut | disconnected along the Y-Y 'line | wire in the state which worn the disposable diaper shown in FIG.

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, 22a: Front absorber, 22b: Rear absorber, 24: Skin contact sheet, 24a: upper sheet, 24b: liner sheet, 26, 26a, 26b: three-dimensional gather, 28: opening, 30: opening elastic material, 32, 32a, 32b: sheet, 34: upper edge, 36 36a, 36b, 36c, 36d: three-dimensional gather elastic material, 38: standing line, 42: elastic material around waist, 44: elastic material around waist, 46: space, 48: urine / feces separation wall, 50: stool capture bag, 52: Ventilation Aqueous sheet, 54: slack portion, 56: through hole, 58: cover sheet, P: a point.

Claims (4)

An absorber, a top sheet that is arranged so as to cover the upper surface of the absorber, and at least a part that is made of a liquid-permeable material, and a surface that covers the lower surface of the absorber, and is made of a liquid-impermeable material A disposable diaper with a backsheet
The absorber is composed of at least two absorbers, a front absorber disposed on the front body side and a rear absorber disposed on the back body side,
The back sheet continuously covers the lower surface of the front absorbent body and the lower surface of the rear absorbent body, and a slack portion is formed in a region between the front absorbent body and the rear absorbent body. Stool for capturing stool in the region between the front absorbent body and the rear absorbent body by sealing both sides of the slack portion and forming a bag shape. A disposable diaper with a catch bag.   The top sheet continuously covers the upper surface of the front absorbent body and the upper surface of the rear absorbent body, and a slack portion is formed in a region between the front absorbent body and the rear absorbent body. The disposable diaper according to claim 1, which is arranged as described above.   The disposable diaper according to claim 1 or 2, further comprising a skin contact sheet disposed on an upper portion of the top sheet and formed with an opening (stool passing opening) through which feces can pass. The skin contact sheet is formed with an opening through which urine can pass (opening for urine passage), and is disposed in a space between the skin contact sheet and the top sheet, and the space is defined as a front body side. Further comprising a urine / feces separation wall that partitions the back body side;
The urine / feces separation wall is disposed between the stool passage opening and the urine passage opening, and communicates the space with the stool passage opening and the opening of the stool capture bag and the stool passage bag. The disposable diaper according to any one of claims 1 to 3, wherein the disposable diaper is partitioned into a space communicating with the urine passage opening.

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