JP5540379B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper provided with an absorbent body, a top sheet, and a back sheet. More specifically, the present invention relates to a disposable diaper that can form a cushion that improves flexibility and tactile sensation in the waist stretchable part.

  Generally, a disposable diaper is made of an absorbent body, a top sheet that is at least partially made of a liquid-permeable material, and arranged to cover the surface of the absorbent body, and a liquid-impermeable material. And a back sheet disposed so as to cover.

  Such a diaper is used so that a top sheet may contact with a wearer's skin, and excrement permeate | transmits the liquid-permeable part of a top sheet, and is absorbed and hold | maintained at an absorber. And the excrement is prevented from leaking outside by the liquid-impermeable back sheet disposed on the back side of the absorber.

  By the way, in the disposable diaper as described above, it is possible to fix a stretched stretchable material around the periphery of the waist opening from the viewpoint of improving the feeling of wearing and fitting and preventing leakage of excrement from the waist opening. Has been done.

  However, even if the stretchable material is simply disposed, the stretchability in the vicinity of the waist opening can be improved, but the flexibility and cushioning properties may be insufficient. For example, 1) Tightening with an elastic material is too strong, and rubber marks (timer marks) are attached to the wearer's skin. 2) The elastic material fixing part tends to become hard due to application of adhesive or thermal fusion of the elastic material. Therefore, the flexibility and feel of the diaper are impaired. 3) The problem that the wearer's finger may be damaged as well as the wearer's own skin, especially when the waist edge is stiff. was there.

  Therefore, in the disposable diaper, various proposals have been made to improve flexibility, cushioning properties and the like while maintaining stretchability in the vicinity of the waist opening. For example, the outer layer sheet, the inner layer sheet and a plurality of elastic members are used to form an outer packaging material for the absorbent article, and the outer layer sheet and the inner layer sheet are formed by joints formed intermittently in the waist circumference direction and the orthogonal direction. The elastic member is arranged not to be fixed to the outer layer sheet and the inner layer sheet by arranging the elastic member so as not to pass through the joint portion while being joined to each other. A pants-type disposable diaper in which a plurality of bags extending from the outer end portion to the inner end portion is formed has been proposed (see Patent Documents 1 to 5).

JP 2008-136793 A JP 2008-136794 A JP 2008-142316 A JP 2008-142341 A JP 2008-142342 A

  In the pants-type disposable diapers described in Patent Documents 1 to 5, since the elastic member is disposed so as not to pass through the joint portion between the outer body and the inner layer sheet, the elastic member is restrained by both the outer body and the inner layer sheet. It can be stretched freely. Therefore, for example, even when the elastic member is arranged at a stretch rate of 300% at the time of manufacture, the elastic member may be stretched locally exceeding the stretch rate of 300% at the time of use. That is, when compared with a structure in which the elastic member is bonded and fixed to the exterior body or the inner layer sheet, the elastic member may extend excessively beyond an ideal expansion rate, and the elastic member that is tightly stretched may be interposed through the inner layer sheet. There is a problem that it may come into contact with the skin and cause pain and discomfort.

  Furthermore, since the above structure is a special structure in which the elastic member is arranged so as not to pass through the intermittent joining portion between the outer layer sheet and the inner layer sheet, a precise joining technique is required in the production, There was also a problem that it was difficult.

  The present invention has been made in view of the above-described problems of the prior art, and provides a disposable diaper that is excellent in stretchability, flexibility, and cushioning properties near the waist opening and can be easily manufactured. To do.

  As a result of intensive investigations to solve the problems of the prior art as described above, the inventor forms a waist stretchable part by continuously fixing a waist stretchable material between two sheet materials in an expanded state. In addition, it is conceived that the above problem can be solved by joining a cushion forming sheet intermittently with a regular pattern on the skin contact surface and the outermost surface of the waist stretchable part. Was completed. Specifically, the following disposable diapers are provided by the present invention.

[1] The front body, the crotch part, and the back body, each of which includes an absorbent body, a top sheet that is at least partially made of a liquid-permeable material and covers the surface of the absorbent body, A back sheet made of a permeable material and arranged to cover the back surface of the absorber, and a stretched waist between at least two sheet members constituting the front body or the back body A stretchable material is continuously fixed in a direction along the waist edge of the front body or the back body to form a waist stretchable portion, is formed of a water-repellent nonwoven sheet, and covers the skin contact surface of the waist stretchable portion. as such, the inner cushion formed sheets intermittently bonded in a regular pattern on the sheet material constituting the skin contact surface, consist of water-repellent nonwoven fabric sheet, covering the outermost surface of the waist stretchable portion In the the outer cushion formed sheets intermittently bonded in a regular pattern on the sheet material constituting the outermost surface, further comprising a, in the region where the waist elastic member is disposed, the inner cushion forming sheet and the The external cushion forming sheet is joined by a linear joint extending in a direction from the waist edge toward the crotch side or a plurality of joints intermittently arranged in the direction, and along the waist edge. By intermittently joining in the direction and following the expansion and contraction of the waist elastic material, between the joint of the inner cushion forming sheet and the sheet material constituting the skin contact surface and the outer cushion forming sheet and the outermost surface The disposable diaper comprised so that a some space may be formed between the joining of the sheet | seat material which comprises .

[2] The inner cushion-forming sheet and the outer cushion-forming sheet constitute a cushion-forming sheet that is a continuous sheet material made of a water-repellent nonwoven sheet , and the cushion-forming sheet includes the skin contact surface, The sheet material constituting the skin contact surface and the sheet material constituting the outermost surface are intermittently joined in a regular pattern so as to continuously cover the waist edge and the outermost surface. Disposable diaper according to 1].

[3] At least one of the inner cushion-forming sheet and the outer cushion-forming sheet is formed by a folded portion of a sheet material constituting the front body or a sheet material constituting the rear body [1] Or the disposable diaper as described in [2].

  The disposable diaper of this invention is excellent in the elasticity of a waist opening part vicinity, a softness | flexibility, and cushioning properties, and can be manufactured easily.

It is a perspective view showing typically one embodiment of the disposable diaper of the present invention. It is an outline top view showing typically the state where the disposable diaper shown in Drawing 1A was developed and it looked from the top sheet direction. It is a schematic end view which shows typically the A-A 'cutting | disconnection end surface of the disposable diaper shown to FIG. 1B. It is a schematic end view which shows typically the B-B 'cut end surface of the disposable diaper shown in FIG. 1B. It is a schematic plan view which shows typically the state which developed the disposable diaper shown in Drawing 1A, and was seen from the outer sheet direction. It is a perspective view showing typically the waist elastic part neighborhood of the disposable diaper shown in Drawing 1A. It is a schematic end view which shows typically the A-A 'cutting | disconnection end surface of the disposable diaper shown to FIG. 1F. It is a schematic plan view which expands and schematically shows the form of the joint part of the disposable diaper shown in FIG. 1A. It is a schematic process figure which shows typically the state which looked at the manufacturing process of the disposable diaper shown to FIG. 1A from the outer surface side or the skin contact surface side. FIG. 2B is a schematic end view schematically showing a cut end surface cut at the center in the width direction of the structural unit shown in FIG. 2A in each step shown in FIG. 2A. It is a schematic plan view which expands and schematically shows another form of the joint part of a disposable diaper. It is a schematic plan view which expands and shows typically another form of the junction part of a disposable diaper. It is a schematic plan view which expands and shows typically another form of the junction part of a disposable diaper typically. It is a schematic plan view which expands and schematically shows another form of the joint part of a disposable diaper. It is a schematic plan view which expands and shows typically another form of the junction part of a disposable diaper. It is a schematic end view which shows typically the cut end surface cut | disconnected in the width direction center of a disposable diaper about another embodiment of the disposable diaper of this invention. It is a schematic end view which shows typically the cut end surface cut | disconnected by the width direction center of a disposable diaper about another embodiment of the disposable diaper of this invention. It is a schematic end view which shows typically the cut end surface cut | disconnected by the width direction center of a disposable diaper about another embodiment of the disposable diaper of this invention. It is a schematic end view which shows typically the cut end surface cut | disconnected in the width direction center of a disposable diaper about another embodiment of the disposable diaper of this invention.

  Hereinafter, the form for implementing the disposable diaper of this invention is demonstrated concretely by the example of a pants-type disposable diaper. However, the present invention broadly includes disposable diapers (for example, tape-type disposable diapers and the like) provided with the invention-specific matters, and is not limited to the following embodiments.

  In FIG. 1B and FIG. 1E, in order to illustrate the arrangement of the waist stretchable material 42, the joint 76A shown in FIG. That is, the joint portions not shown are also formed at the same positions as the joint portions 76A shown in FIG. 1A in the inner cushion forming sheets 60 and 61 or the outer cushion forming sheets 62 and 63 shown in FIGS. 1B and 1E.

[1] Definitions etc .:
A “disposable diaper” is composed of the front body, the crotch part, and the back body part, an absorbent body, and at least a part made of a liquid-permeable material. The top sheet is arranged so as to cover the surface of the absorbent body And a backsheet made of a liquid-impermeable material and disposed so as to cover the back surface of the absorber, and means an absorbent article that is worn so as to enclose the waist of the wearer .

  In this specification, “front body”, “inseam” and “back body” are defined as follows. For example, like the disposable diaper 1A shown in FIG. 1B or FIG. 1E, the exterior body 16 is formed in a constricted shape having a narrowest portion in the center in the front-rear direction in order to form the leg opening 12. The portion between the first boundary line connecting the starting points on the front body 2 side of the constriction and the second boundary line connecting the starting points on the back body 6 side of the constriction is “the crotch part (reference numeral 4 in the figure)”, A portion from the first boundary line to the front end (waist end edge 2c) of the exterior body 16 is “front body (reference numeral 2 in the drawing)”, and the rear end (waist edge 6c) from the second boundary line to the exterior body 16 The part up to is referred to as “rear body (symbol 6 in the figure)”. In other words, as shown in FIG. 1A, in the state where the disposable diaper 1 </ b> A is assembled, the portion between the left and right joints 8, 8 becomes the front body 2 or the back body 6.

  The “pants-type disposable diaper” is a pant-type in which one waist opening 10 and a pair of left and right leg openings 12 are formed as in the disposable diaper 1A shown in FIGS. 1A to 1E among the disposable diapers. Meaning what is provided with the exterior body 16 to exhibit and the absorptive main body 14 which is arrange | positioned inside the exterior body 16 and is the absorption pad in which the absorber 22 was included.

  The “tape-type disposable diaper” means a disposable diaper provided with a fastening tape for fastening the front body and the back body.

[2] Configuration of disposable diaper of the present invention:
In the present invention, for example, as shown in FIGS. 1A to 1E, 1) between at least two sheet materials (in the illustrated example, the outer sheet 16b and its folded portion 24) constituting the front body 2 or the back body 6 The stretched waist elastic material 42 is continuously fixed in the direction along the waist edge 2c of the front body 2 or the waist edge 6c of the back body 6 to form a waist stretchable part 68. 2) Nonwoven fabric It is made of a sheet and intermittently in a regular pattern on a sheet material (in the illustrated example, the folded portion 24 of the outer sheet 16b) constituting the skin contact surface so as to cover the skin contact surface of the waist stretchable portion 68. 3) A sheet material (illustrated) which is composed of a nonwoven fabric sheet and which constitutes the outermost surface so as to cover the outermost surface of the waist stretchable portion 68. In the example that an external cushion forming sheet 62, 63 are intermittently bonded in a regular pattern in the outer sheet 16b), a disposable diaper 1A according to subject matter of the.

  The stretchable waist stretchable material 42 is continuously fixed between the layers of the two sheet materials (the outer sheet 16b and its folded portion 24) to form the waist stretchable portion 68, whereby the pants of Patent Documents 1 to 5 are formed. Unlike the type disposable diaper, the waist elastic material 42 behaves integrally with the outer sheet 16b and the folded portion 24 thereof. Therefore, the waist elastic material 42 does not extend beyond the outer sheet 16b and the folded portion 24.

  Further, as shown in FIGS. 1F and 1G, the two sheet materials (the outer sheet 16b and the folded portion 24) that fix the flexure follow the contraction of the waist elastic material 42, so that the outer The distance between the joining portions 76A of the inner cushion forming sheet 61 and the outer cushion forming sheet 63 that are intermittently joined to the seat 16b and the folded portion 24 is also narrowed. As a result, the inner cushion forming sheet 61 and the outer cushion forming sheet 63 are also bent and deformed in the same manner as the outer sheet 16b and the folded portion 24 thereof, except for the joint portion 76A between the inner cushion forming sheet 61 and the folded portion 24 of the outer sheet 16b. And the portion other than the joint portion 76A between the outer cushion forming sheet 63 and the outer seat 16b are separated, and a space 69 is formed.

  The space 69 exhibits a buffering function like an air cushion. That is, since the inner cushion forming sheet 61 and the outer cushion forming sheet 63 are interposed and the space 69 is formed, the joint portion 76A and the waist elastic member 42 are worn by the wearer's skin (or fingers of the person performing the replacement work). This makes it difficult to directly contact the wearer's skin and the hard feel of the joint portion 76A and the waist elastic material 42. Therefore, the skin contact around the waist of the diaper can be felt softly. When the diaper is worn, the waist stretchable material 42 is stretched and tightly stretched, so that the tactile sensation of the waist stretchable material 42 tends to be hard. In such a case, the buffer function of the space 69 is particularly effective. In addition, the space 69 communicates the inside of the diaper and the outside of the diaper, and also has an effect of improving air permeability.

  Furthermore, the disposable diaper of the present invention has, as shown in, for example, FIGS. 2A and 2B, two sheet materials (the original outer sheet 71 and the folded portion corresponding to the folded outer portion of the original outer sheet 71) that will later constitute a waist stretchable part. 78), a sheet material (original inner cushion forming sheet 74) that will later become an inner cushion forming sheet and a sheet material (original outer cushion forming sheet 75) that will later become an outer cushion forming sheet are intermittently arranged in a regular pattern. It can manufacture by the method of joining to (joining part 76A). That is, unlike the pants-type disposable diapers described in Patent Documents 1 to 5, a precise joining technique such as joining sheets in consideration of the position of the stretchable material is unnecessary and can be easily manufactured.

[2-1] Waist stretchable part:
As shown in FIGS. 1A to 1E, the disposable diaper of the present invention has a stretched waist elastic material 42 between the layers of at least two sheets constituting the front body 2 or the back body 6. A waist stretchable portion 68 is formed by being continuously fixed in the direction along the edge 2c or the waist edge 6c of the back body 6.

  The “two sheet materials” may be independent sheet materials, or one sheet material may be formed of a folded portion of the other sheet material. In other words, the “two sheet materials” in the present invention also include one in which a single sheet material configured substantially functions as two sheet materials. 1A to 1B and FIGS. 1D to 1E are examples in which the outer sheet 16b of the exterior body 16 and the folded portion 24 thereof are “two sheet materials”, and the waist stretchable material 42 is fixed between the layers. It is.

  The combination of “two sheet materials” is not limited to the illustrated form. For example, as shown in FIG. 4b and the like, a stretched waist elastic material 42 may be fixed between the inner sheet 16a and the outer sheet 16b constituting the exterior body 16, or the exterior body is not provided. In a tape type disposable diaper, it is good also as composition which fixes a waist elastic material between the layers of a top sheet (center sheet) and a back sheet.

  “At least two sheet materials” means that the waist stretchable part may be constituted by a laminate of three or more sheet materials. For example, the form shown in FIG. 6b is a form in which the waist elastic material 42 is fixed between the outer sheet 16b and the inner sheet 16a of the outer package 16, and the folded portion 33 of the outer sheet 16b is further laminated on the inner sheet 16a. It is an example of the waist expansion-contraction part 68. FIG.

  “In the direction along the waist edge” means that the waist stretchable material 42 is arranged so as to be parallel to the waist edges 2c and 6c as shown in FIGS. 1B and 1E. In this case, the waist end edges 2c and 6c and the waist elastic member 42 need only be arranged substantially in parallel, and need not be parallel in a strict sense.

  The method of “fixing” is not particularly limited, but at least one of 1) waist elastic material, 2) one sheet material of two sheet materials, and 3) the other sheet material of two sheet materials is hot. Examples thereof include a method of coating or spraying and fixing an adhesive such as a melt adhesive. A specific method will be described in the section of the manufacturing method.

  “Continuously fixed” means that the joint is continuous in the direction along the waist edge. Thus, it becomes possible to make a waist elastic material and two sheet materials which pinch | interpose this integrally behave by making a junction part continue in the direction in alignment with a waist edge.

  The “joining portion” includes not only the joining portion of the waist elastic material and the sheet material but also the joining portion that joins the two sheet materials together. For example, in a technique such as spiral spray or omega coat described later, the contact point between the spiral adhesive coating portion and the waist stretchable material may be discontinuous in the direction along the waist edge. Even in such a case, if the adhesive coating part is continuously formed in the direction along the waist edge, the effect of causing the waist elastic material and the two sheet materials sandwiching this to behave integrally is exhibited. It is included in the scope of the present invention.

  The definition of “fixed in the stretched state” is the same as that of the leg stretcher described later. The material and form of the waist stretch material, the preferred stretch rate, etc. are the same as those of the leg stretch agent.

[2-2] Internal cushion forming sheet:
The disposable diaper of this invention is equipped with the characteristic member called the internal cushion formation sheets 60 and 61 and the external cushion formation sheets 62 and 63, as shown to FIG. 1A-FIG. 1B and FIG. 1D-FIG. 1E.

  The inner cushion forming sheets 60 and 61 are made of a non-woven sheet, and the sheet material constituting the skin contact surface so as to cover the skin contact surface of the waist stretchable portion 68 (in the illustrated example, the folded portion 24 of the outer sheet 16b). ) Is a sheet material intermittently joined in a regular pattern.

  “Covering the skin contact surface of the waist stretchable part” means that the inner cushion forming sheets 60 and 61 are arranged at positions where they directly contact the wearer's skin. That is, in the configuration of the present invention, the inner cushion-forming sheets 60 and 61 are in direct contact with the wearer's skin, not the two sheet materials sandwiching the waist elastic material 42. With such a configuration, the hard tactile sensation of the joint that fixes the waist elastic material 42 is less likely to act directly on the wearer's skin.

  The “sheet material constituting the skin contact surface” is not limited to the folded portion 24 of the outer sheet 16b as shown in FIGS. 1B and 1D to 1E. For example, an inner sheet of an outer package may be used, and a top sheet (center sheet) or a side sheet may be used as long as the diaper does not have an outer package such as a tape-type disposable diaper.

  The inner cushion forming sheet is a non-woven sheet. It can be comprised with the hydrophilic nonwoven fabric similar to the top sheet mentioned later, the water-repellent nonwoven fabric similar to the cover sheet similarly mentioned later, a three-dimensional gather, or an exterior body. For example, a water-repellent non-woven fabric can be suitably used when it is difficult to leave a wet feeling and a smooth touch is desired. However, the inner cushion-forming sheet is preferably made of a hydrophilic nonwoven fabric. Such a configuration can impart sweat absorption to the internal cushion forming sheet that is in direct contact with the wearer's skin.

The basis weight of the internal cushion forming sheet is preferably 10 to 50 g / m ² . When it is less than 10 g / m ^2, there is a risk that the strength of the sheet decreases and the diaper waist is broken when the diaper is pulled up. On the other hand, if it exceeds 50 g / m ² , the rigidity of the seat is too high, and it becomes difficult to bend in conjunction with the contraction of the elastic material, making it difficult to form a cushion structure. May decrease.

  The lengths of the inner cushion forming sheets 60 and 61 are not particularly limited, but it is preferable to set the length so that the arrangement portion of the waist stretchable material 42 can be sufficiently covered. Specifically, it is preferably 20 to 100 mm.

  In the disposable diaper of the present invention, at least one of the inner cushion forming sheet and the outer cushion forming sheet described later is formed by a folded portion of a sheet material constituting the front body or a sheet material constituting the rear body. Also good. That is, it is not necessary to configure the internal cushion forming sheet or the external cushion forming sheet as an independent sheet material, and a part of a non-woven member (for example, a top sheet, a cover sheet, an exterior body, etc.) that constitutes a disposable diaper is used. May be.

  For example, in the form shown in FIG. 4d, the waist elastic material 42 is sandwiched between the inner sheet 16a and the outer sheet 16b of the outer package 16 to form a waist elastic part, and the inner cushion forming sheet is formed by the folded part 27 of the inner sheet 16a. 61 is formed and the outer cushion forming sheet 63 is formed by the folded portion 28 of the outer sheet 16b.

  In the form shown in FIG. 5d, the waist elastic member 42 is sandwiched between the outer sheet 16b of the outer package 16 and the first folded part 29 of the outer sheet 16b to form a waist elastic part, and the second folded of the outer sheet 16b. This is an example in which the inner cushion forming sheet 61 is formed by the portion 30, and the outer cushion forming sheet 63 is formed by the third folded portion 31 of the outer sheet 16b.

  In the form shown in FIG. 6d, the waist elastic member 42 is sandwiched between the inner sheet 16a and the outer sheet 16b of the outer package 16 to form a waist elastic part, and the inner sheet 16a is formed by the first folded part 33 of the outer sheet 16b. This is an example in which the inner cushion forming sheet 61 is formed by the second folded portion 34 and the outer cushion forming sheet 63 is formed by the third folded portion 35 of the outer sheet 16b.

  In the form shown in FIG. 7d, the waist stretchable part 42 is formed by sandwiching the waist stretchable material 42 between the inner sheet 16a of the outer package 16 and the folded portion 35 of the inner sheet 16a, and the outer cushion forming sheet 63 is formed by the outer sheet 16b. Is formed, and the inner cushion forming sheet 61 is formed by the folded portion 41 of the outer sheet 16b.

  The internal cushion forming sheet has a hole that communicates the space between the wearer's skin and the diaper and the space formed between the internal cushion forming sheet and the sheet material constituting the skin contact surface. Also good. By setting it as such a structure, moisture is discharged | emitted by the moisture in a diaper to the external space of a diaper via the said hole and the said space.

  The “hole” only needs to be an opening that allows communication between the space between the wearer's skin and the diaper and the space, and the shape thereof is not particularly limited. For example, shapes such as a circle, an ellipse, and a polygon (triangle, square, etc.) can be mentioned.

  The “hole” includes not only one that is always open, but also one that can be opened and closed. For example, by forming a slit having a convex shape or a plurality of intersecting slits on the inner cushion forming sheet, a hole having a tongue piece that functions as a valve can be obtained. With the tongue piece, moisture can be discharged while preventing urine and body fluid from entering the space.

  Although the form of the slit is not particularly limited, examples of the “slit having a convex locus” include a) a slit having a curved portion, b) a slit having a bent portion, and the like. Examples of “a plurality of intersecting slits” include c) a cross-shaped slit where two slits intersect, and d) a star-shaped slit where three slits intersect.

  It is preferable that the hole is formed in a portion where the space of the inner cushion forming sheet is formed (that is, a region between the joint portions). In this case, it is also preferable to form a hole near the end of the inner cushion-forming sheet, join a portion closer to the tip than the hole of the inner cushion-forming sheet, and forcibly open the hole. Such a configuration is preferable in that moisture is likely to flow into the space and the moisture is easily discharged to the external space of the diaper, as compared with a structure in which holes are simply formed in the internal cushion forming sheet.

  Further, a plurality of holes may be formed in the inner cushion forming sheet. By forming a plurality of holes, the air permeability is improved and the moisture is easily discharged to the external space of the diaper.

The specific number of “plurality” is not particularly limited. Although depending on the opening area of the holes, it is preferable to form 5 to 200 holes, more preferably 10 to 100 holes if the opening area is 0.5 to 10 mm ² . The effect of improving air permeability can be obtained by setting the number to 5 or more. On the other hand, by setting it to 200 or less, it is possible to effectively prevent urine and body fluid from flowing into the straw.

  It is also a preferred form that a drug is adhered to the surface of the internal cushion forming sheet. By attaching the medicine, the medicinal effect based on the medicine can be imparted to the inner cushion forming sheet that is in direct contact with the skin of the wearer.

  The type of the drug is not particularly limited. In addition to the moisturizing agent (aloe extract, propylene glycol, etc.) and the moisturizing effect, skin care additives (eucalyptus extract etc.) having urease inhibitory activity, disinfectant, antibacterial agent ( Edetacetic acid, benzalkonium chloride, etc.) and deodorants (various polyphenol compounds, etc.).

[2-3] External cushion forming sheet:
The outer cushion forming sheets 62 and 63 are made of a nonwoven fabric sheet, and intermittently in a regular pattern on a sheet material (the outer sheet 16b in the illustrated example) constituting the outermost surface so as to cover the outermost surface of the waist stretchable portion 68. Sheet material joined together. That is, the outer cushion-forming sheets 62 and 63 are sheet materials having a cushion-forming function like the inner cushion-forming sheets 60 and 61, although the arrangement portions thereof are different.

  “Covering the outermost surface of the waist stretchable part” means that the outer cushion forming sheets 62 and 63 are arranged in the outermost layer of the diaper. That is, in the configuration of the present invention, at least two sheet materials sandwiching the waist elastic material 42 are not arranged in the outermost layer of the diaper, and the external cushion forming sheets 62 and 63 directly touch the wearer's skin. With such a configuration, the hard tactile sensation of the joint that fixes the waist elastic member 42 is not exposed on the outermost surface of the diaper, and flexibility and cushioning can be imparted to the outermost surface of the diaper.

  The “sheet material constituting the outermost surface” is not limited to the outer sheet 16b of the exterior body 16 as shown in FIGS. 1D and 1E. If it is a diaper which does not have an exterior body like a tape type disposable diaper, a back sheet and a cover sheet may be sufficient.

  The outer cushion forming sheets 62 and 63 can adopt the same configuration as the inner cushion forming sheets 60 and 61 except for their arrangement positions. However, it is not necessary for both sheets to have the same configuration. For example, sheets having different materials and basis weights may be used, and the form of the joint between both sheets may be different.

[2-4] Cushion forming sheet:
In the present invention, the inner cushion forming sheet and the outer cushion forming sheet do not need to be formed of independent sheet materials, and the inner cushion forming sheet 60 and the outer cushion forming sheet 62 are continuous sheets as shown in FIG. 1D. You may comprise the cushion formation sheet 65 which is material.

  The cushion forming sheet 65 includes a sheet material (a folded portion 24 of the outer sheet 16b) and an outermost surface that constitute the skin contact surface so as to continuously cover the skin contact surface, the waist edge 2c, and the outermost surface. It is preferable to be intermittently joined to the sheet material (outer sheet 16b) that constitutes a regular pattern.

  In the above configuration, the cushion forming sheet 65 is joined so that the edges of the two sheet materials (the outer sheet 16b and the folded portion 24) forming the waist stretchable portion 68 are wrapped, and flexibility and cushioning properties are imparted. Yes. Further, since the inner cushion forming sheet 60 and the outer cushion forming sheet 62 form a continuous sheet body at the waist edge 2c, the edges of these sheet materials are not positioned. Therefore, it is possible to prevent a situation in which the feeling of wear is reduced, such as the edge hitting the skin of the wearer and giving a stimulus or causing pain.

  In addition, in the example shown to FIG. 1D, the same structure is employ | adopted not only on the front body 2 side but on the back body 6 side. That is, the inner cushion forming sheet 61 and the outer cushion forming sheet 63 constitute a cushion forming sheet 66 that is a continuous sheet material, and the cushion forming sheet 66 continuously covers the skin contact surface, the waist edge 6c, and the outermost surface. Thus, the sheet material constituting the skin contact surface (the folded portion 24 of the outer sheet 16b) and the sheet material constituting the outermost surface (the outer sheet 16b) are intermittently joined in a regular pattern.

[2-5] Joint part:
“Intermittently joined in a regular pattern” means that the inner cushion forming sheets 60 and 61 and the sheet material constituting the skin contact surface are joined by joint portions repeatedly arranged in a fixed pattern. This means that it does not include the case where the shape is bonded by an uncontrollable bonding pattern, for example, when the adhesive coating portion is formed by curtain coating. The outer cushion forming sheets 62 and 63 and the sheet material constituting the outermost surface are also bonded in the same bonding form.

  “Intermittently” means that the inner cushion-forming sheets 60 and 61 and the sheet material constituting the skin contact surface are not joined together, and the joined parts are formed discontinuously or intermittently. Means. In order to form a cushion structure, the interval between the joints is preferably 2 to 50 mm, and particularly preferably 5 to 10 mm. A similar structure is adopted for the outer cushion forming sheets 62 and 63 and the sheet material constituting the outermost surface.

  Note that “intermittent” may be intermittent in one direction, and need not be intermittent in all directions. For example, in order to promote exhaust of moisture and the like from the waist edge side of the diaper, the waist edge direction may be intermittent, and the diaper front and back may be joined by a continuous joint. By joining in such a form, the space to be formed becomes a straight straw shape continuous in the front-rear direction of the diaper, which is preferable in that air permeability can be easily improved. The continuous joints may be formed in a long line shape, or may be formed in a line so that the plurality of joints are on a straight line extending in the front-rear direction.

  FIG. 1H is an enlarged view schematically showing the vicinity of the waist edge 6c of the disposable diaper 1A shown in FIGS. 1A to 1E, and shows the form of the joint portion 76A (joint portion 76A). In this embodiment, one linear joint 90A is configured as an aggregate of five dot-like joints 92A. The dot-shaped joint portion 92A has a racetrack shape in which semicircles are coupled to both ends of a rectangle. The linear joint portions 90 </ b> A are arranged at regular intervals in the front-rear direction of the external cushion forming sheet 63.

  In the present specification, the term “linear” widely includes shapes longer in the front-rear direction than in the width direction, and includes shapes such as strips and strips in addition to so-called linear shapes. In addition, in order for a plurality of dot-like joints to be recognized as an “aggregate”, it is necessary that the distance between adjacent dot-like joints be 5 mm or less.

  The form of the joint is not limited to that shown in FIG. 1H, and for example, forms as shown in FIGS. 3A to 3E can be adopted.

  In the form shown in FIG. 3A, the joining portion 76 </ b> B includes a plurality of linear joining portions 90 </ b> B that go in the front-rear direction of the exterior body 16, and the linear joining portions 90 </ b> B are intermittently formed in the width direction of the exterior body 16. Each of the linear joint portions 90B is formed as an aggregate in which a plurality of dot-like joint portions 92B are arranged in a line in the front-rear direction of the exterior body 16.

  In the example shown in FIG. 3A, since the linear joint portion 90B is oriented in the front-rear direction of the exterior body 16, moisture or the like is directed in the front-rear direction as compared with the case where it is oriented in the width direction. It is easy to flow, and exhaust of moisture etc. from the waist edge 6c side of a diaper can be promoted. Moreover, it is easy to make a diaper follow the curvilinear shape around a wearer's waist, and it is excellent also in fitting property and a feeling of wear. Furthermore, since the linear joint portion 90B is formed as an aggregate of circular dot-like joint portions 92B, even if the joint portion 76B that tends to become hard to touch touches the skin, it is difficult to cause pain.

  3B includes a plurality of linear joint portions 90C in which the joint portions 76C are directed in the front-rear direction of the exterior body 16, and the linear joint portions 90C are intermittently formed in the width direction of the exterior body 16. Each of the linear joint portions 90C is arranged in a matrix satisfying n> m with a plurality of dot-like joint portions 92C in n rows in the front-rear direction and m columns in the width direction. It is a form formed as an aggregate. In this embodiment, by setting “n> m”, more dot-shaped joints 92C are arranged in the front-rear direction than in the width direction in each linear joint 90C, and the front-rear direction is longer than the width direction. It is formed in a linear shape.

  In the example shown in FIG. 3B, the linear joint 90C is formed as an aggregate of circular dot-shaped joints 92C, and the dot-shaped joints 92C are formed as an aggregate arranged in a matrix of 5 rows and 2 columns. Has been.

In the above-mentioned form, it is preferable to form 1 to 30 linear joints having a width of 1 to 4 mm and a length of 2 to 80 mm in the length direction, and each linear joint has an area per piece. Is preferably an aggregate in which dot-shaped joint portions of 1 to 4 mm ² are arranged in a matrix at intervals of 0.5 to 5 mm in the width direction and at intervals of 0.5 to 3 mm in the length direction.

  In FIGS. 3A and 3B, the example has been described in which the linear joint is formed as an assembly of dot joints. However, in the present invention, the linear joint must be formed as an assembly of dot joints. There is no. For example, as shown in FIG. 3C, in addition to the joint portion 76 </ b> D being intermittently formed in the width direction of the exterior body 16, a form in which the joint portion 76 </ b> D is continuously formed in the front-rear direction of the exterior body 16 is also possible. Preferred (linear joint portion 92D). By continuously forming the joining portion 76D in the front-rear direction of the folded portion 64 or the like, the space to be formed becomes a straw shape, and the air permeability improvement effect and the flexibility improvement effect are easily exhibited. In addition, the space formed by the joining portion 76D being formed in a continuous linear shape is not easily crushed.

  In addition, it is sufficient that the joint portion of the present invention is intermittently formed in any one direction, and is necessarily intermittent in the width direction as shown in FIGS. 3A to 3C and continuous in the front-rear direction. It is not limited to a specific form. For example, a plurality of linear joint portions 92E may be arranged in a lattice shape like a joint portion 76E shown in FIG. 3D, or a plurality of dot-like joint portions like a joint portion 76F shown in FIG. 3E. 92F may be arranged in a staggered manner. Even in such a form, the flexibility and cushioning properties in the vicinity of the waist opening, which are the effects of the present invention, can be obtained.

[2-6] Specific embodiment and manufacturing method thereof:
As concrete embodiment of the disposable diaper of this invention, the following 4 forms can be mentioned.

[2-6a] First embodiment:
The first embodiment has a basic structure of a disposable diaper in which a waist stretchable part is formed by sandwiching a waist stretchable material 42 between the inner sheet 16a and the outer sheet 16b of the exterior body 16 as shown in FIG. To do.

  The basic structure of the disposable diaper shown in FIG. 4a is as follows: 1) a form in which an internal cushion forming sheet 61 and an external cushion forming sheet 63 are joined (FIG. B), and 2) an internal cushion forming sheet. 3) A form in which a cushion forming sheet 66 in which an outer cushion forming sheet 63 and an outer cushion forming sheet 63 are integrally joined is joined (Fig. 3c). 3) The inner cushion forming sheet 61 is formed by the folded portion 27 of the inner sheet 16a, and the outer seat 16b The form etc. which formed the external cushion formation sheet 63 by the folding | turning part 28 of this can be mentioned. In addition, the form shown to b figure -d figure of FIG. 4 coat | covers the rear end of the absorptive main body 14 with the pressing sheet | seat 17 independent from the other member.

[2-6b] Second embodiment:
In the second embodiment, a waist stretchable part is formed by sandwiching a waist stretchable material 42 between the outer sheet 16b of the exterior body 16 and the first folded portion 29 of the outer sheet 16b as shown in FIG. A disposable diaper is the basic structure. The disposable diaper 1A shown in FIGS. 1A to 1E also belongs to the second embodiment.

  As a form having the basic structure of the disposable diaper shown in FIG. 5a, 4) a form in which an internal cushion forming sheet 61 and an external cushion forming sheet 63 are joined to each other (FIG. B), and 5) an internal cushion forming sheet. 61 and a cushion forming sheet 66 in which the outer cushion forming sheet 63 is integrally formed (FIG. C), 6) the inner cushion forming sheet 61 is formed by the second folded portion 30 of the outer sheet 16b, and the outer The form etc. which formed the external cushion formation sheet | seat 63 by the 3rd folding | turning part 31 of the sheet | seat 16b can be mentioned (the d figure).

  5B and 5C, the folded portion 24 of the outer sheet 16b is used as a pressing sheet, and the rear end of the absorbent main body 14 is covered. The form shown in FIG. Is a structure in which the rear end of the absorbent main body 14 is covered with a pressing sheet 17 independent of other members.

[2-6c] Third embodiment:
In the third embodiment, as shown in FIG. 6a, a waist stretchable part 42 is formed by sandwiching a waist stretchable material 42 between the inner sheet 16a and the outer sheet 16b of the exterior body 16, and the outer sheet 16b A disposable diaper in which the surface of the inner sheet 16a is covered by the one folded portion 33 is used as a basic structure.

  The basic structure of the disposable diaper shown in FIG. 6a is as follows. 7) Form in which the internal cushion forming sheet 61 and the external cushion forming sheet 63 are joined (FIG. B), 8) Internal cushion forming sheet 61 and the cushion forming sheet 66 in which the outer cushion forming sheet 63 is integrally formed (FIG. C), 9) the first folded portion 33 of the outer sheet 16b covers the surface of the inner sheet 16a, The form etc. which formed the internal cushion formation sheet 61 by the 2nd folding | turning part 34 and formed the external cushion formation sheet 63 by the 3rd folding | turning part 35 of the outer sheet | seat 16b can be mentioned (FIG. D).

  6B and 6C, the folded portion 33 of the outer sheet 16b is used as a pressing sheet, and the rear end of the absorbent main body 14 is covered. The form shown in FIG. Is a structure in which the rear end of the absorbent main body 14 is covered with a pressing sheet 17 independent of other members.

[2-6d] Fourth embodiment:
In the fourth embodiment, as shown in FIG. 7A, the waist elastic member 42 is sandwiched between the inner sheet 16a of the outer package 16 and the outer sheet 16b or the interlayer of the folded portion 37 of the inner sheet 16a. The basic structure is a disposable diaper that is formed and covers the vicinity of the waist edge of the surface of the inner sheet 16a by the first folded portion 41 of the outer sheet 16b.

  7) As a form having a basic structure of the disposable diaper shown in FIG. 7a, 10) a form in which an internal cushion forming sheet 61 and an external cushion forming sheet 63 are joined (FIG. B), and 11) an internal cushion forming sheet. 61 and a cushion forming sheet 66 in which the outer cushion forming sheet 63 is integrally formed (FIG. C), 12) the outer cushion forming sheet 63 is formed by the outer sheet 16b, and the folded portion 41 of the outer sheet 16b is formed. The form etc. which formed the internal cushion formation sheet 61 by this can be mentioned (the d figure).

  In addition, the form shown to b figure -d figure of FIG. 7 coat | covers the rear end of the absorptive main body 14 with the pressing sheet | seat 17 independent from the other member.

[2-7] Manufacturing method:
The disposable diaper of this invention can be manufactured by the process as shown, for example in FIG. 2A and FIG. 2B.

  FIG. 2A is a process diagram schematically showing a manufacturing example of the disposable diaper 1A shown in FIGS. 1A to 1E. 2B is a schematic end view schematically showing a cut end surface obtained by cutting each step shown in FIG. 2A at the center in the width direction of the structural unit shown in FIG. 2A. 2A and 2B, for convenience of drawing, only the portion corresponding to the vicinity of the waist edge 6c on the back body 6 side of the disposable diaper 1A shown in FIGS. 1A to 1E is enlarged and shown.

  Further, FIG. 2A is a diagram shown for each structural unit of the disposable diaper for convenience of drawing, but in practice, a continuous manufacturing method may be adopted. Specifically, the long sheet material and the long stretchable material are sent out in the left-right direction in FIG. 2A, and the structure unit shown in FIG. preferable.

  First, as shown in FIG. 2A and FIG. 2B, a raw inner sheet 70 (a sheet material that later becomes an inner sheet) and an original outer sheet 71 (a sheet material that later becomes an outer sheet) are bonded together. At this time, the original outer sheet 71 is pasted so as to protrude from the edge 72 of the original inner sheet 70. This bonding can be performed by adhesion using a hot melt adhesive or the like.

  Separately from this, an original cushion forming sheet 73 (a sheet material to be a cushion forming sheet later) is prepared. The original cushion forming sheet 73 is configured by integrally forming an original inner cushion forming sheet 74 (a sheet material to be an internal cushion forming sheet later) and an original outer cushion forming sheet 75 (a sheet material to be an outer cushion forming sheet later). is there.

  Next, as shown in FIG. 2A and FIG. 2B, the original cushion forming sheet 73 is intermittently joined to the original outer sheet 71 in a regular pattern (joining portion 76A). In the illustrated example, the joining portion 76A is formed by heat sealing, continuously in the front-rear direction of the disposable diaper (vertical direction in FIG. 2A), and intermittently in the width direction (left-right direction in FIG. 2A). A joining portion 76A is formed.

  Further, as shown in FIG. 2A and FIG. 2B, the hot melt adhesive is continuously applied to the surface of the original outer sheet 71 on the skin contact surface side, and the original waist elastic material 77 is disposed in an extended state. To do. At the same time, an absorbent main body 14 is attached.

  Adhesion of the original waist elastic material 77 is as follows: 1) A hot melt adhesive is continuously applied to the original outer sheet 71 or its corresponding folded portion 78 (the portion that will later become the folded portion), and the original waist is applied to the coated portion. A method of arranging and fixing the elastic material 77 in an extended state, 2) a method of directly applying or spraying a hot melt adhesive to the original waist elastic material 77, and arranging and fixing the original waist elastic material 77 in an extended state, 3) The original waist elastic material 77 is placed in an extended state on the upper portion of the original outer sheet 71 or the folded portion equivalent portion 78, and the hot melt adhesive is sprayed in that state, and the original outer sheet 71 or the folded portion thereof. A hot melt adhesive can be attached to both the corresponding portion 78 and the original waist elastic material 77, and the original waist elastic material 77 can be fixed.

  “Continuous coating” in these forms includes not only a form in which the adhesive is solid-coated or sprayed over the entire surface but also a form in which the adhesive is applied in a spiral shape. That is, it is sufficient if the joint is formed continuously in the width direction of the disposable diaper. Even when any one of the methods 1) to 3) is adopted, the joint portion is continuously formed in the width direction of the disposable diaper. Accordingly, a space continuous in the front-rear direction of the disposable diaper is not formed between the original outer sheet 71 or the folded portion equivalent portion 78.

  The bonding method of 1) is a method such as slit coater (sim coater), curtain spray, spiral spray, omega coat, etc., and the bonding method of 2) is a method such as comb gun, omega coat, Sure wrap, etc. 3) This bonding method can be carried out by a technique such as omega coat or Sure Wrap. The omega coat can be carried out by using, for example, an omega nozzle head (manufactured by ITW Dynatech), and the wrapping can be carried out by, for example, using a wrap nozzle (manufactured by Nordson).

  Finally, as shown in FIG. 2A and FIG. 2B, the folded portion equivalent portion 78 is folded back at the waist edge equivalent position 79 and bonded to the original outer sheet 71, the original inner sheet 70 and the absorbent main body 14. Fix it. As a result, the original waist stretchable material 77 is fixed between the original outer sheet 71 and the folded portion equivalent portion 78 and the waist stretchable portion equivalent portion 80 is formed. In this manner, a disposable diaper in which the original cushion forming sheet 73 is intermittently joined in a regular pattern to the skin contact surface and the outermost surface of the waist stretchable portion equivalent portion 80 can be obtained.

[3] Components of disposable diapers:
The disposable diaper of this invention is equipped with the absorber 22, the top sheet 18, and the back seat | sheet 20 as a structural member like the disposable diaper 1A shown to FIG. 1A-FIG. 1E.

[3-1] Absorber:
The “absorber” is a member for absorbing and holding the wearer's urine and the like, and is made of an absorbent material. Examples of the absorbent material include fluff pulp, super absorbent polymer (hereinafter referred to as “SAP”), a hydrophilic sheet, and the like. As the fluff pulp, wood pulp or non-wood pulp defibrated in a cotton-like form, the SAP as sodium polyacrylate, the hydrophilic sheet as tissue, absorbent paper, a non-woven fabric subjected to a hydrophilic treatment, etc. Is preferably used.

  As the “absorber”, it is preferable to use a material in which one or more absorbent materials are formed into a single-layer or multi-layer mat. Especially, what combined 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, SAP may be mixed in a fluff pulp mat, or may be used in a layered manner between layers of a plurality of mats. In order to prevent the SAP from falling off and to impart shape stability, it is preferable to encapsulate the entire absorbent body with a hydrophilic sheet. A disposable diaper 1A shown in FIG. 1C and FIG. 1D is an example in which the entire absorbent body 22 is encapsulated by an upper tissue 54 and a lower tissue 56 which are hydrophilic sheets.

  What is necessary is just to use what was shape | molded in desired shapes, such as rectangular shape and an hourglass shape, according to the objective. A disposable diaper 1A shown in FIGS. 1A to 1E is an example in which a rectangular absorbent body 22 is used. The “absorber” is coated on the front side with a top sheet and on the back side with a back sheet. That is, it is arranged between the top sheet and the back sheet.

[3-2] Top sheet:
The “top sheet” is a sheet-like member arranged so as to cover the surface of the absorbent body (the surface on the side facing the wearer's skin when the diaper is worn). Since it is necessary to allow the wearer's urine or the like to permeate, at least a part (all or part) of the wearer's urine is made of a liquid-permeable material.

  Examples of the liquid permeable material include woven fabric, nonwoven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As said nonwoven fabric, the nonwoven fabric manufactured by manufacturing methods, such as air through (card hot air) and card | curd embossing, can be used conveniently. The hydrophilic treatment can be performed by applying, spraying, impregnating, etc., a surfactant to the raw cotton of the nonwoven fabric.

  The top sheet is “at least partially” made of a liquid-permeable material. Although the position is not particularly limited, it is preferable that the portion overlapping the arrangement position of the absorber in the crotch portion is made of a liquid-permeable material when viewed in plan.

  In the disposable diaper of the present invention, it is not necessary that the entire surface on the side facing the wearer's skin is covered with the top sheet. For example, in a tape-type disposable diaper, a top sheet made of a liquid permeable material is arranged at the center in the width direction of the diaper, and a side sheet made of a breathable water repellent material at the side edge (side flap portion) of the diaper in the width direction. A form of arranging is often used. At this time, it is preferable to use a nonwoven fabric sheet obtained by a method such as card embossing or spunbond, particularly a highly waterproof nonwoven fabric sheet such as SMS or SMMS, as the air-permeable and water-repellent material.

[3-3] Backsheet:
A back seat | sheet is a sheet-like member arrange | positioned so that the back surface (surface on the side which turns away from a wearer's skin at the time of mounting | wearing 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.

  There is no restriction | limiting in particular about the arrangement position of a back seat | sheet. From the viewpoint of preventing leakage of urine absorbed by the absorbent body, it is preferable that the back sheet is disposed so as to cover at least the position where the absorbent body is disposed.

  Examples of the liquid impermeable material include a liquid impermeable film made of a resin such as polyethylene. Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film is a film in which a large number of fine pores of 0.1 to several μm are formed, and is liquid-impermeable but has moisture permeability. Therefore, it is possible to prevent the diaper from being steamed while ensuring the leak-proof property.

  In a tape-type disposable diaper, a form in which a cover sheet is bonded to the outer surface side of a back sheet is often used. 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.

[3-4] Various elastic materials:
In the disposable diaper of the present invention, in addition to the waist elastic material, it is preferable to arrange an elastic material such as a leg elastic material or a tammy elastic material.

  A leg elastic material is an elastic material for forming a leg gather. In the case of a pants-type disposable diaper, as shown in FIGS. 1A, 1B, and 1E, a form in which a plurality of linear leg elastic members 40 are arranged in a curved line along the outer edge of the leg opening 12 is often used. In this embodiment, as shown in FIG. 1E, it is preferable that the leg elastic member 40 is arranged so as not to cross the center of the crotch part 4. By preventing the contraction force of the leg elastic member 40 from acting on the center of the crotch part 4, the absorbent body 22 can be prevented from twisting and the fit of the absorbent body 22 in the crotch part 4 can be improved. On the other hand, in the case of a tape-type disposable diaper, a form in which a plurality of pairs of left and right linear elastic materials are arranged in a straight line parallel to at least the crotch part is often used.

  The Tammy stretchable material is a stretchable material for forming a Tammy gather in a pants-type disposable diaper. As shown in FIG. 1A, FIG. 1B, and FIG. 1E, a form in which a plurality of linear Tammy stretch materials 44 are linearly arranged in a portion corresponding to the circumference of the wearer's stomach is often used. Also in this embodiment, for the same reason as in the case of the leg elastic material, it is preferable to arrange the tammy elastic material 44 so as not to cross the arrangement site of the absorber 22 as shown in FIG. 1E.

  As elastic materials, flat rubber made of natural rubber and thread rubber made of elastic yarn of synthetic rubber (urethane rubber, etc.), elastic net, elastic film, elastic foam (urethane foam, etc.), etc. are preferably used. be able to.

  The stretchable material is fixed in the stretched state in order to exert a sufficient stretch force without exerting an excessive tightening force on the wearer. The stretchable material can be fixed by, for example, adhesion using a hot melt adhesive, other highly fluid adhesive, heat sealing, heat sealing, or ultrasonic welding.

  “Fixed in the stretched state” refers to a sheet material (an inner sheet 16a, an outer sheet 16b, and a folded portion of the outer sheet 16b in the illustrated example) in a state where the stretchable material is stretched to 120% or more. 24) means that they are joined, fixed or the like. Among them, the elongation rate is preferably 200 to 400%, and more preferably 250 to 350%. Note that the “stretch rate” indicates a percentage of the length of the stretchable material in the stretched state with respect to the length (original size) of the stretchable material in the non-stretched state.

  In the case of a pants-type disposable diaper, both the leg elastic member 40 and the tammy elastic member 44 are fixed by, for example, sandwiching an extended linear elastic material between the inner sheet 16a and outer sheet 16b of the outer package 16. Can be arranged. In the example shown in FIG. 1A, FIG. 1B, and FIG. 1E, the leg elastic member 40 and the tammy elastic member 44 are fixed between the inner sheet 16a and the outer sheet 16b of the outer package 16 so as to sandwich the stretched linear elastic material. Arranged in a way.

  On the other hand, in the case of a tape-type disposable diaper, the leg elastic material is fixed by, for example, sandwiching an extended linear elastic material between the side sheet and the cover sheet, and the waist elastic material is, for example, a top sheet. The sheet-like stretchable material (stretchable foam or the like) in a stretched state is fixed between the cover sheet and the cover sheet so as to be sandwiched therebetween.

[3-5] Solid gather:
The disposable diaper of the present invention includes a pair of left and right three-dimensional gathers 26 (26a, 26b) that are made of a water-repellent sheet 32 and disposed on both sides of the absorbent body 22 as in the disposable diaper 1A shown in FIGS. 1B and 1C. It is preferable.

  A three-dimensional gather can be comprised according to the conventional disposable diaper. As shown in FIG. 1C, a stretched three-dimensional gather stretchable material 36 is sandwiched between layers of the water-repellent sheet 32 and fixed. At this time, as the water repellent sheet, the same material as that of the side sheet can be suitably used.

  In the case of a pants-type disposable diaper, as shown in FIG. 1C, a configuration in which a water-repellent sheet 32 for forming a three-dimensional gather is separately attached to the absorbent main body 14 and the three-dimensional gather 26 is configured integrally with the absorbent main body 14. Often used. On the other hand, in the case of a tape-type disposable diaper, a form in which a three-dimensional gather is constituted by a part of a sheet material (for example, a side sheet made of a water-repellent nonwoven fabric) constituting a diaper is often used.

  As shown in FIGS. 1B and 1C, the disposable diaper 1A is provided with side edge elastic members 38 on both side edges of the three-dimensional gather 26 in addition to the three-dimensional gather elastic material 36. When the side edge stretchable material is arranged in this manner, in the diaper being worn, both side edges of the absorbent main body described later tend to rise from the absorbent body. Such a form makes it easy for urine to collect in the widthwise central portion (that is, the absorbent body) of the absorbent main body after urination, making it difficult for urine leakage to occur.

[3-6] Absorbent body:
In the case of a pants-type disposable diaper, as shown in FIG. 1C and FIG. 1D, an absorbent pad (hereinafter, this member is referred to as “absorbent body”) in which an absorbent body 22 is included may be used. In the disposable diaper 1A shown in FIG. 1C and FIG. The absorptive main body 14 in the form in which these members are integrally formed is used. This absorptive main body 14 is an example of an absorptive main body in which, in addition to the absorber 22, the top sheet 18 and the back sheet 20, a solid gather 26 described later is also integrally formed.

[3-7] Exterior body:
In the case of a pants-type disposable diaper, as shown in FIG. 1A, a member having a pants shape in which one waist opening 10 and a pair of leg openings 12a and 12b are formed (hereinafter, this member is referred to as an “exterior body”). ) May be used. As shown in FIG. 1A to FIG. 1B and FIG. 1D to FIG. 1E, the exterior body 16 forms the front body 2, the crotch 4, and the back body 6 of the diaper.

  As shown in FIG. 1A, the exterior body 16 has a portion (side edge portion) near the side edges 2a and 2b of the front body 2 and a corresponding portion (side edge portion) near the side edges 6a and 6b of the back body 6. Are joined together in advance (joint portion 8), so that one waist opening portion 10 and a pair of leg opening portions 12a and 12b are formed so as to have a pant shape.

  However, the exterior body is not limited to the above configuration. For example, an engageable fastener member is attached to the corresponding side edge portion of the front body and the back body, and can be formed into a pants shape by mutually engaging the fastener members, or the front body and the back Those configured so that corresponding side edge portions of the body are engaged with each other in advance by a detachable fastener member so as to exhibit a pants shape are also included in the “exterior body” in this specification. Examples of the fastener member include a mechanical fastener.

  The material of the outer package is not particularly limited, but it is preferably composed of a material having excellent air permeability, for example, a nonwoven fabric made of polyethylene, polypropylene, polyester, or other synthetic fibers so as to prevent stuffiness inside the diaper.

  The exterior body is often configured by bonding two or more non-woven fabrics together. For example, the disposable diaper 1A shown in FIGS. 1A to 1E is an example in which the exterior body 16 is composed of two nonwoven fabrics (an inner sheet 16a and an outer sheet 16b). However, you may comprise by 3 or more nonwoven fabrics together using other sheet materials like the pressing sheet mentioned later.

  The pants-type disposable diaper is preferably made of a non-woven sheet and further includes a pressing sheet that covers the front end or the rear end of the absorbent main body. By providing the pressing sheet, the front end or the rear end of the absorbent main body is sealed, and the bonded portion of the top sheet 18 and the back sheet 20 is reinforced. Therefore, the SAP inside the absorber 22 is difficult to leak out.

  The pressing sheet may be configured by using a part of a nonwoven fabric sheet that constitutes another member of the diaper (such as an exterior body), or may be separately provided with a nonwoven fabric sheet that is independent from the other member. Good.

  The form shown in FIG. 1B and FIG. 1D is an example using a part of the nonwoven fabric sheet which comprises another member. Specifically, the folded portion 24 of the outer sheet 16 b is used as a pressing sheet, and the folded end 24 covers the front end or the rear end of the absorbent main body 14. On the other hand, the form shown in FIG. 4 a to d, FIG. 5 d, FIG. 6 d or FIG. 7 a to d is an example in which a non-woven fabric sheet independent from other members is additionally provided. is there. Specifically, the front end or the rear end of the absorbent main body 14 is covered with a pressing sheet 17 independent of other members.

[3-8] Fastening tape:
In the case of a tape-type disposable diaper, a disposable diaper having a fastening tape arranged to extend from the left and right side edges of the back body for fixing the front body and the back body is suitably used.

  The fastening member of the fastening tape is not particularly limited. However, it is preferable to use a mechanical fastener (planar fastener) that has a high fastening force and does not easily reduce the fastening force even after a plurality of detachments. For example, a form in which a hook material of a mechanical fastener is attached near the front end of the fastening tape and a front patch made of a loop material of a mechanical fastener is attached to the front body is often used.

  The number of fastening tapes is not particularly limited, and an appropriate number of fastening tapes may be attached according to the dimensions of the wearer's body shape (specifically, around the waist, around the legs, etc.). In general, a pair of disposable diapers for infants (one each on the left and right) is attached, and a pair of disposable diapers for adults (two on the left and two on the left) are attached.

  The disposable diaper of this invention is demonstrated more concretely, referring drawings. However, the disposable diaper of this invention includes all the disposable diapers provided with the invention specific matter, and is not limited to the following examples.

[Example 1]
As the disposable diaper of Example 1, a pants-type disposable diaper was manufactured. The specific structure was the structure of the disposable diaper 1A shown in FIGS. 1A to 1E. This disposable diaper 1A is of an L size for infants, has a length in the front-rear direction of 485 mm, and a width of the back body 6 (a length between the side edges 6a and 6b) of 325 mm. The manufacturing method was performed by the steps shown in FIGS. 2A and 2B.

  In the disposable diaper 1A shown in FIG. 1D, a cushion forming sheet 65 is joined to the outer sheet 16b constituting the front body 2 and the folded portion 24 thereof. Similarly, cushion forming sheets 65 and 66 are joined to the outer sheet 16b constituting the back body 6 and the folded portion 24 (see also FIGS. 1F and 1H).

The cushion forming sheets 65 and 66 are made of spunbonded nonwoven fabric and have a basis weight of 19 g / m ² . The cushion forming sheet 65 serves as the inner cushion forming sheet 60 and the outer cushion forming sheet 62, and the cushion forming sheet 66 serves as the inner cushion forming sheet 61 and the outer cushion forming sheet 63.

  The joining portion 76 </ b> A was formed intermittently in the width direction of the outer sheet 16 b and the folded portion 24. The joining portions 76A are arranged at intervals of 7 mm in the width direction of the outer sheet 16b and the folded portion 24 thereof. As shown in FIGS. 1F and 1H, the joining portion 76A is a plurality of linear joining portions 90A that are directed in the front-rear direction of the outer sheet 16b and the folded portion 24 thereof.

Each of the linear joint portions 90 </ b> A was formed as an aggregate in which a plurality of dot joint portions 92 </ b> A were arranged in a line in the front-rear direction of the external cushion forming sheet 63. The area of one dot joint was 4.6 mm ² . The shape is a racetrack shape in which a semicircle with a diameter of 1 mm is bonded to both ends of a rectangle with a width of 1 mm and a length of 1.5 mm, and the interval in the front-rear direction (direction perpendicular to the width direction) of the dot-shaped joint portion 92A is It was set to 0.5 mm. An aggregate of five dot-like joint portions 92A was configured as one linear joint portion 90A, and the linear joint portions 90A were arranged at 2 mm intervals in the front-rear direction of the external cushion forming sheet 63.

  As shown in FIGS. 1D and 1F, a waist stretchable material 42 is disposed in an expanded state between the outer sheet 16b and the folded portion 24 thereof. Six waist elastic members 42 were arranged in a stretched state with a stretch rate of 300% (three times the original length) in the direction along the waist edge 2c, 6c. As the elastic waist member 42, a flat rubber made of natural rubber (thickness 0.35 mm × width 0.65 mm) was used.

  The disposable diaper of the present invention can be used as a disposable diaper for infants or adults such as elderly people and persons with disabilities who need care, more specifically as a pants-type disposable diaper or a tape-type disposable diaper.

1A: disposable diaper, 2: front body, 2a, 2b: side edge, 2c: waist edge, 4: crotch, 6: back body, 6a, 6b: side edge, 6c: waist edge, 8: joint 10: Waist opening, 12, 12a, 12b: Leg opening, 14: Absorbent body, 16: Exterior body, 16a: Inner sheet, 16b: Outer sheet, 17: Presser sheet, 18: Top sheet, 20: Back sheet, 22: Absorber, 24, 27, 28: Folded part, 26, 26a, 26b: Solid gather, 29, 33: First folded part, 30, 34: Second folded part, 31, 35: Third Folded part, 32: Water repellent sheet, 36: Three-dimensional gather elastic material, 38: Side edge elastic material, 40: Leg elastic material, 42: Waist elastic material, 44: Tammy elastic material, 54: Upper tissue, 56: Lower tissue , 60, 61: inner cushion forming sheet, 62, 63: outer cushion forming sheet, 64: folded portion, 65, 66: cushion forming sheet, 68: waist stretchable portion, 69: space, 70: original inner sheet, 71: Original outer sheet, 72: edge, 73: original cushion forming sheet, 74: original inner cushion forming sheet, 75: original outer cushion forming sheet, 76A, 76B, 76C, 76D, 76E: joint, 77: original waist expansion / contraction Material: 78: Folded portion equivalent portion, 79: Waist edge equivalent position, 80: Waist stretchable portion equivalent portion, 90A, 90B, 90C, 92D, 92E: Linear joint, 92A, 92B, 92C, 92F: Dot shape Junction.

Claims (3)

Consists of front body, inseam and back body parts,
An absorber, at least partly made of a liquid-permeable material, a top sheet arranged to cover the surface of the absorber, and a liquid-impermeable material so as to cover the back surface of the absorber A backsheet disposed,
A stretchable waist stretch material is continuously fixed in a direction along the waist edge of the front body or the back body between the layers of at least two sheets constituting the front body or the back body, and stretches the waist. Part is formed,
An internal cushion-forming sheet consisting of a water-repellent nonwoven sheet and intermittently joined in a regular pattern to a sheet material constituting the skin contact surface so as to cover the skin contact surface of the waist stretchable part;
An outer cushion-forming sheet comprising a water-repellent non-woven sheet and intermittently joined to the sheet material constituting the outermost surface in a regular pattern so as to cover the outermost surface of the waist stretchable part ,
In the region where the waist stretchable material is disposed, the inner cushion-forming sheet and the outer cushion-forming sheet are disposed linearly in the direction from the waist edge toward the crotch side or intermittently disposed in the direction. The inner cushion forming sheet and the skin contact surface are joined by the plurality of joined portions and intermittently joined in a direction along the waist edge, and following the expansion and contraction of the waist elastic material. The disposable diaper comprised so that a some space may be formed between the joining of the sheet | seat material which comprises A, and the joining of the sheet | seat material which comprises the said outer cushion formation sheet and the said outermost surface . The inner cushion forming sheet and the outer cushion forming sheet constitute a cushion forming sheet that is a continuous sheet material made of a water-repellent nonwoven fabric sheet ,
The cushion forming sheet has a rule for a sheet material constituting the skin contact surface and a sheet material constituting the outermost surface so as to continuously cover the skin contact surface, the waist edge and the outermost surface. The disposable diaper according to claim 1, which is intermittently joined in a typical pattern.   The at least one of the inner cushion forming sheet and the outer cushion forming sheet is formed by a folded portion of a sheet material constituting the front body or a sheet material constituting the rear body. Disposable diapers.

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