JP2012183134A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper having an absorbent body which is bridged over between a front-body housing and a back-body housing, preferably fitted to the skin of a wearer while securing mobility of the wearer, and improving a liquid leakage prevention property in excretion, in a bridging type disposable diaper formed with no leg gathers.SOLUTION: The absorbent body 3 bridged over between the front-body housing and the back-body housing is formed with three-dimensional gathers 34, and stretched elastic stretchable members 35a, 35b, and 35c are disposed in a region near standing lines of the three-dimensional gathers, along the longitudinal direction of the absorbent body to raise the three-dimensional gathers such that the three-dimensional gathers are fitted to the skin of the wearer.

Description

  The present invention relates to a disposable diaper. If it demonstrates concretely, this invention relates to the disposable diaper of the structure by which the absorptive main body was bridge | crosslinked between the front body exterior body and the back body exterior body.

  Conventionally, disposable diapers for infants and the elderly are known, for example. There are various types of such disposable diapers, for example, pants-type disposable diapers in which the front and back sides of the disposable diaper are joined in advance, and both sides of the front or back of the disposable diaper. 2. Description of the Related Art There is known a disposable diaper with a tape that has an adhesive tape attached to the part and uses the adhesive tape to attach the front body and the back body when worn. These disposable diapers generally include an absorbent body, a top sheet that covers the surface of the absorbent body, a back sheet that covers the back surface of the absorbent body, and a pair of three-dimensional gathers having fixed ends on the top sheet. .

  Many of these pants-type disposable diapers and tape-type disposable diapers have elastic elastic members placed around the legs of the wearer, creating a gather around the legs at the openings around the legs. (Patent Document 1). By forming such leg gathers, it is possible to enhance the fit with the legs when worn and to prevent liquid such as urine from leaking from the openings around the legs.

  In recent years, a cross-linked disposable diaper having a configuration in which an absorbent main body is cross-linked between a front body exterior body and a back body exterior body is also known (Patent Document 2). Such a bridging disposable diaper is not provided with gathers around the legs, and the conventional gathers around the legs tighten the legs of the wearer, for example, to give the wearer a feeling of pressure or to compare the skin. This is proposed because of the fact that tightening traces remain in the soft part or the area of the opening around the leg is reduced, making it difficult for the wearer to insert the leg. Cross-linked disposable diapers are superior to conventional disposable diapers in that they do not give the wearer a feeling of pressure when worn, increase the mobility around the legs, and facilitate movement.

JP 2009-254662 A JP 2010-233733 A

  However, in a cross-linked disposable diaper that does not form gathers around the legs of the wearer, there is a concern that the fit with the legs when worn and the leakage prevention from the openings around the legs may be reduced. Is done. That is, since gathers around the legs are not formed in the cross-linked disposable diaper, only the absorbent main body cross-linked between the front body exterior body and the back body exterior body contacts the wearer's crotch. , Urine and other liquids excreted by the wearer will be received. Therefore, the cross-linked disposable diaper has a problem that it is difficult to fit the disposable diaper to the skin in accordance with the movement of the wearer, and the liquid leak-proof property during excretion is low.

  For this reason, at present, in a cross-linked disposable diaper that does not form gathers around the legs, an absorbent main body that is bridged between the front body exterior body and the back body exterior body is worn while ensuring the mobility of the wearer. There is a demand for a technique for fitting the skin of a person appropriately and enhancing the leak-proof property of the liquid during excretion.

  Therefore, as a result of intensive studies to solve the above-described problems of the prior art, the present inventor formed a three-dimensional gather on the absorbent main body bridged between the front body exterior body and the rear body exterior body, Acquired the knowledge that a three-dimensional gather can be lifted in a direction that fits the wearer's skin by disposing an elastic elastic member in an elongated state along the longitudinal direction of the absorbent main body in the region near the standing line . And this inventor discovered that the conventional subject could be solved if the solid gathers formed in the absorptive main body were made to fit a wearer's skin.

  Thus, the present invention provides a cross-linked disposable diaper that does not form gathers around the legs, and has an absorbent main body that is bridged between the front body exterior body and the back body exterior body while ensuring the wearer's mobility. While fitting suitably to a wearer's skin, the leak-proof property of the liquid at the time of excretion can be improved.

Specifically, the present invention has the following configuration.
The present invention relates to a crosslinked disposable diaper including a front body exterior body 1, a back body exterior body 2, and an absorbent main body 3.
The front body exterior body 1 is a member that contacts the wearer's abdomen. The back body exterior body 2 is a member that contacts the back of the wearer. The absorbent main body 3 is a member that has at least a front end joined to the front body exterior body 1 and at least a rear end joined to the rear body exterior body 2, and is formed between the front body exterior body 1 and the rear body exterior body 2. Placed in.

In the present invention, the absorbent main body 3 includes an absorber 31, a top sheet 32, a back sheet 33, a pair of three-dimensional gathers 34, and an elastic elastic member 35a.
The absorber 31 is a member for absorbing and holding a liquid.
The top sheet 32 is a liquid-permeable member that covers the absorbent body 31 from the side that contacts the skin of the wearer.
The back sheet 33 is a liquid-impermeable member that covers the absorber 31 from the side opposite to the top sheet 32 and has a tangent line T that adheres to the top sheet 32 along both side edges of the absorber 31. .
Each of the three-dimensional gathers 34 is a member formed on both side edges of the absorbent main body 3 and fixed on a fixing line P formed along the longitudinal direction of the top sheet 32, and functions as a leak-proof wall.
The elastic elastic member 35 a extends along the longitudinal direction of the absorbent main body 3 in a standing region R that is a region between the tangent line T between the top sheet 32 and the back sheet 33 and the fixed line P between the top sheet 32 and the three-dimensional gather 34. It is a member arranged in an extended state. When the elastic expansion and contraction member 35a contracts, the three-dimensional gather 34 is lifted from the root portion in a direction in contact with the wearer's skin.
Note that the standing region R is defined as a vertical line from the tangent line T between the top sheet 32 and the back sheet 33 toward the bottom surface of the absorbent article 3 and a fixed line P between the top sheet 32 and the three-dimensional gather 34. The area between the perpendiculars toward the bottom surface of the absorbent article 3 is an area having a width, a height, and a depth.

  Thus, in the absorptive main body 3 of the present invention, since the three-dimensional gather 34 is lifted in a direction in contact with the wearer's skin, the three-dimensional gather 34 is suitably fitted to the wearer's skin and liquid is prevented during excretion. Leakage can be increased. Accordingly, the fit and leakage resistance of the wearer can be improved without forming a leg gather in the disposable diaper.

In a preferred embodiment of the present invention, the elastic elastic member 35 a is disposed in the upright region R and is disposed between the back sheet 33 and the side sheet forming the three-dimensional gather 34.
Specifically, in the preferred embodiment of the present invention, a part of the side sheet forming the three-dimensional gather 34 is bonded to the bottom surface of the back sheet 33 along the longitudinal direction of the side edge of the back sheet 33. A part of the side sheet forming the three-dimensional gather 34 is fixed on a fixed line P formed along the longitudinal direction of the top sheet 32. Thereby, the three-dimensional gather 34 is formed so as to sandwich the back sheet 33 and the top sheet 32. The elastic expansion / contraction member 35 a is a standing region R and is disposed between the side sheet forming the three-dimensional gather 34 and the back sheet 33.

  As described above, the elastic elastic member 35a is disposed in the standing region R at a position close to the bottom surface of the absorbent main body 3, so that the three-dimensional gather 34 is caused to have its root portion by the contraction force of the elastic elastic member 35a. Can be lifted from. In addition, since a plurality of sheets overlap each other between the elastic elastic member 35a and the skin of the wearer, the wearer can be given a feeling of pressure by the elastic elastic member 35a or the elastic elastic member 35a Tightening will not leave any marks on the wearer's soft skin.

In a preferred embodiment of the present invention, each of the pair of solid gathers 34 includes an inner solid gather 341 and an outer solid gather 342.
The inner three-dimensional gather 341 stands at a fixed line P with respect to the top sheet 32 and absorbs at least one elastic elastic member 35b extending along the longitudinal direction at the tip thereof. Tilt toward the inside of the body 31.
The outer three-dimensional gather 342 is formed on the outer side of the absorber 31 with respect to the inner three-dimensional gather 341, and at least one elastic expansion / contraction member 35c extending along the longitudinal direction is disposed at the tip of the outer three-dimensional gather 342. As it stands up, it tilts toward the outside of the absorber 31.

  Thus, the leak-proof property of the absorptive main body 3 can be improved by forming substantially two-dimensional gathers. In particular, the inner three-dimensional gather 341 is lifted in the direction in contact with the wearer's skin by the elastic stretchable member 35a being disposed at the root portion thereof, and the elastic stretchable member 35b is disposed at the tip thereof. It tilts toward the inside of the absorber 31. Therefore, the inner solid gather 341 is more closely attached to the wearer's skin. On the other hand, even if the liquid leakage cannot be prevented by the inner three-dimensional gather 341, the outer three-dimensional gather 342 is provided, so that it is possible to more reliably prevent the liquid from leaking from the absorption body 3.

In a preferred embodiment of the present invention, the pair of three-dimensional gathers 34 (each of the inner three-dimensional gather 341 and the outer three-dimensional gather 342) is formed of one side sheet having water repellency.
Specifically, first, a part of the side sheet is bonded to the bottom surface of the side edge portion of the back sheet 33 along the longitudinal direction of the back sheet 33.
Further, the side sheet is folded toward the inside of the absorbent body 31 at the first folded portion 41 located outside the absorbent body 31 rather than the side edge of the back sheet 33.
In addition, at least one elastic elastic member 35c in an extended state is sandwiched in the first folded portion 41 along the longitudinal direction of the side sheet, so that the first folded portion 41 stands.
Thereby, first, the outer three-dimensional gather 342 is formed.
Next, a part of the side sheet folded at the first folding part 41 is fixed to the surface of the top sheet 32 at a fixing line P formed along the longitudinal direction of the side edge of the top sheet 32. Yes.
Further, the side sheet folded back at the first folding portion 41 is folded toward the inside or the outside of the absorber 31 at the second folding portion 42.
Further, at least one elastic elastic member 35b in an extended state is sandwiched in the second folded portion 42 along the longitudinal direction of the side sheet, so that the second folded portion 42 stands on the fixed line P. is doing.
Thereby, the inside solid gather 341 is formed.

  As described above, since the three-dimensional gather 34 including the inner three-dimensional gather 341 and the outer three-dimensional gather 342 is formed by one side sheet, the joint of the sheet material is eliminated, so that the liquid leaks from the joint of the sheet. The situation can be prevented. In addition, since there is no need to stack sheet materials, it is possible to provide a three-dimensional gather 34 that is soft and compact as a whole. Further, since the entire three-dimensional gather 34 is composed of one side sheet and there are no joints or overlapping portions of the sheet material, the inner three-dimensional gather 341 and the three-dimensional gather 341 and The three-dimensional gather 34 including the outer three-dimensional gather 342 is easily lifted as a whole.

  In a preferred embodiment of the present invention, a plurality of elastic elastic members are disposed in the extended state along the longitudinal direction of the inner three-dimensional gather 341 at the tip of the inner three-dimensional gather 341. Of the plurality of elastic elastic members, the elastic elastic member arranged at the position closest to the tip of the inner three-dimensional gather 341 has the lowest stress and is arranged at the position farthest from the tip of the inner three-dimensional gather 341. The elastic elastic member has the highest stress.

  By having such a configuration, the distal end portion of the inner three-dimensional gather 341 (the portion of the inner three-dimensional gather where the elastic elastic member is disposed) is disposed at a position farthest from the tip of the inner three-dimensional gather 341. Bending toward the outside of the absorber 31 with the elastic elastic member as a starting point. Thereby, the inner side three-dimensional gather 341 becomes easy to adhere to a wearer's skin.

In a preferred embodiment of the present invention, a plurality of elastic elastic members are disposed in the extended state along the longitudinal direction of the outer three-dimensional gather 342 at the tip of the outer three-dimensional gather 342.
Among the plurality of elastic elastic members, the elastic elastic member arranged at the position closest to the tip of the outer three-dimensional gather 342 has the lowest stress and is arranged at the position farthest from the tip of the outer three-dimensional gather 342. The elastic elastic member has the highest stress.

  By having such a configuration, the distal end portion of the outer three-dimensional gather 342 (the portion of the outer three-dimensional gather where the elastic elastic member is disposed) is disposed at a position farthest from the distal end of the outer three-dimensional gather 341. Bending toward the outside of the absorber 31 with the elastic elastic member as a starting point. Thereby, the outside three-dimensional gather 341 also becomes easy to adhere to the wearer's skin.

FIG. 1 is a schematic perspective view showing an example of a disposable diaper, and shows a state where the disposable diaper is viewed from the front body exterior body side. FIG. 2 is a development view of the disposable diaper shown in FIG. 1 and shows a state as seen from the top sheet side of the absorbent main body. FIG. 3 is a cross-sectional view taken along line AA shown in FIG. 2 and shows an example of an absorbent main body. FIG. 4 is a cross-sectional view showing a modification of the absorbent main body.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes those appropriately modified by those skilled in the art from the following embodiments.

(1. Overall configuration of disposable diapers)
FIG. 1 is a schematic view showing an example of a disposable diaper 10 and shows a state in which the disposable diaper 10 is viewed from the front body exterior body side. FIG. 2 is a development view of the disposable diaper 10 shown in FIG. 1 and shows a state of the absorbent main body 3 as viewed from the top sheet 32 side. As shown in FIGS. 1 and 2, the disposable diaper 10 includes a front body exterior body 1 that contacts the wearer's abdomen, a rear body exterior body 2 that contacts the wearer's back, and a front body exterior body 1. This is a cross-linked disposable diaper including an absorbent main body 3 that is cross-linked between the back body exterior body 2.

  The absorptive main body 3 is formed in a substantially rectangular shape, and each short side is joined to the front body exterior body 1 and the back body exterior body 2. That is, a region having a predetermined length from the front end that is one of the short sides of the absorbent body 3 is joined to the front body exterior body 1 and a predetermined length from the rear end that is the other short side of the absorbent body 3. The region having the shape is joined to the back body exterior body 2. As a means for joining these members, a known method can be used. For example, it may be fixed to a fixing method using a hot-melt adhesive or other fluid adhesive, or a heat seal or the like. It is good also as fixing by heat welding or ultrasonic welding.

  Further, as shown in FIG. 1 and FIG. 2, by attaching the end portions of the side flaps 51 corresponding to the both side edges of the front body exterior body 1 and the back body exterior body 2 so as to correspond to each other, A waist opening 52 located around the waist and a leg opening 53 located around the wearer's leg when worn. In this way, the cross-linked disposable diaper 10 is formed, and the wearer has both legs from the waist opening 52 so that the front body exterior body 1 contacts the abdomen and the back body exterior body 5 contacts the back. The disposable diaper 10 is put on by inserting the portions and taking out the respective leg portions from the opening portions 52 around the leg portions.

(2. Specific configuration of disposable diapers)
Hereinafter, the specific structure of the disposable diaper 10 concerning this invention is demonstrated using drawing.

(2-1. Front body exterior body and back body exterior body)
The front body exterior body 1 and the back body exterior body 2 are in contact with the wearer's abdomen and back, and absorbable located between the front body exterior body 1 and the back body exterior body 2 when the disposable diaper 10 is worn. It is a member for suspending the main body 3.

  In the development view of the disposable diaper shown in FIG. 2, the front body exterior body 1 includes a long side that is a side that becomes a waist circumference end, and both sides of a side flap 51 that is a joint portion between the back body exterior body 2 and , And a substantially trapezoidal shape having a short side that is a side to be joined to the absorbent main body 3. Similarly, for the back body exterior body 2, the long side that is the side that becomes the waist circumference end, the both sides of the side flap 51 that is the joint portion with the front body exterior body 1, and the absorbent main body 3 are joined. It has a substantially trapezoidal shape with a short side that is a side to be cut. However, with respect to the front body exterior body 1, each of the oblique sides connecting the both sides of the side flap 51 and the short side to be joined to the absorbent main body 3 has an arc shape. For this reason, even when the front body exterior body 1 and the back body exterior body 2 are joined, the leg-periphery opening 53 has the front body exterior body 1 opened relatively widely, and the legs of the wearer move. It is easy.

  The end portions of the side flaps 51 extending to both side edges of the front body exterior body 1 and the back body exterior body 2 are overlapped with each other and joined by known joining means such as heat embossing or sonic welding. .

  The front body exterior body 1 and the back body exterior body 2 are formed of, for example, a flexible fiber nonwoven fabric, a plastic sheet, or a laminate sheet thereof on the surface that contacts the wearer's skin and the surface that does not contact the wearer's skin. Has been. Between the fiber nonwoven fabric and the plastic sheet, for example, a hot melt adhesive is used, and a waist elastic elastic member 54 is disposed in an extended state along the waist circumference ends of the front body exterior body 1 and the back body exterior body 2. ing.

(2-2. Absorbent body)
The absorbent main body 3 is held in a state of being bridged between the front body exterior body 1 and the back body exterior body 2, and is located in the crotch portion of the wearer when the disposable diaper 10 is worn. It is a member for absorbing and holding liquid such as urine.

FIG. 3 is a cross-sectional view of the disposable diaper 10 taken along the line AA shown in FIG. That is, FIG. 3 is a schematic sectional view showing an example of a sectional shape of the absorbent main body 3. As shown in FIG. 3, the absorptive main body 3 has an absorbent body 31, a top sheet 32, a back sheet 33, a pair of three-dimensional gathers 34, and an elastic elastic member 35a as a basic configuration.
Originally, each sheet material constituting the absorbent main body 3 is extremely thin. However, in FIG. 3, the drawing is performed with a conceptual thickness for easy understanding.

(2-2-1. Absorber)
The absorber 31 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 31 is disposed between a liquid-permeable top sheet 32 and a liquid-impermeable back sheet 33. The absorber 31 has a function of absorbing the liquid that has passed through the top sheet and is made of an absorbent material.

  As the absorbent material constituting the absorber 31, a known material can be adopted. As the absorbent material, for example, flap pulp, superabsorbent polymer, or hydrophilic sheet may be used. In addition, as the absorbent material, one kind of flap pulp, superabsorbent polymer, or hydrophilic sheet may be used alone, or two or more kinds may be used in combination. The absorbent material is usually formed and used in a single-layer or multi-layer mat shape.

  The absorber 31 is preferably sandwiched between at least a part between the top sheet 32 and the back sheet 33. That is, when the shape of the absorber 31 is rectangular, both side edges that are long sides and upper and lower peripheral edges that are short sides are sealed between the top sheet 32 and the back sheet 33. The

  The shape of the absorber 31 can be appropriately designed according to the shape, size, and application of the disposable diaper. For example, the shape of the absorber 31 may be an hourglass shape as shown in FIG. Moreover, it is good also as a rectangular type, an elliptical type, or a gourd type currently used for the general disposable diaper.

(2-2-2. Top sheet)
The top sheet 32 is a member that is in direct contact with the skin of the wearer's crotch and allows liquid such as urine to pass through the absorber 31. For this reason, the top sheet 32 is made of a liquid-permeable material having high flexibility. Further, the top sheet 32 is disposed so as to cover the surface of the absorbent body 1.

  The example of the impermeable material which comprises the top sheet 32 is a woven fabric, a nonwoven fabric, or a porous film. Further, for example, a fiber made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon, which has been subjected to a hydrophilization treatment and further made into a non-woven fabric may be used.

(2-2-3. Backsheet)
The back sheet 33 is a member for preventing the liquid that has passed through the top sheet 32 and absorbed by the absorber 31 from leaking. For this reason, the back sheet 33 is made of a liquid-impermeable material. The back sheet 33 is disposed so as to cover the bottom surface of the absorber 31 in order to prevent liquid leakage from the bottom surface of the absorber 1.

  An example of the impermeable material constituting the back sheet is a liquid-impermeable film made of polyethylene resin. In particular, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed.

  As shown in FIG. 3, the absorber 31 is placed on the back sheet 33, the top surface of the placed absorber 31 is covered with the top sheet 32, and the top sheet 32 covering the absorber 31 is formed. , And bonded to the back sheet 33 along both side edges of the absorber 31. Therefore, a tangent line T in which the top sheet 32 is bonded along both side edges of the absorber 31 is formed on the back sheet 33. As shown in FIG. 3, the tangent line T can be said to be a tangent line of the absorber 31, the top sheet 32, and the back sheet 33. At the tangent line T, the top sheet 32 and the back sheet 33 may be bonded by, for example, a bonding method using a hot melt adhesive or other fluid adhesive, or heat welding such as heat sealing or ultrasonic waves. You may adhere | attach by welding.

  Further, a cover sheet 55 may be bonded to the outer surface of the back sheet 33 in order to reinforce the back sheet and improve its feel. As a material constituting the cover sheet 55, a woven fabric or a non-woven fabric is used. In particular, it is preferable to use a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester as a material constituting the cover sheet 55.

(2-2-4. Solid gather)
The pair of three-dimensional gathers 34 are members that stand along both side edges of the absorbent main body 3 and prevent side leakage of urine excreted by the wearer. Each of the three-dimensional gathers 34 serves as a urine leak-proof wall in an upright state (a state in which the elastic elastic member is contracted). However, it prevents side leakage that leaks from the openings around the legs of disposable diapers.

  Each of the three-dimensional gathers 34 is fixed to the top sheet 32 at a fixing line P formed along the longitudinal direction on the top sheet 32. As shown in FIG. 3, the pair of three-dimensional gathers 34 is fixed to the top surface of the top sheet 32 and the bottom surface of the back sheet 3 so as to sandwich both side edges of the top sheet 32 and the back sheet 33.

  In each of the three-dimensional gathers 34, one or a plurality of elastic elastic members are disposed along the longitudinal direction of the distal end portion of the three-dimensional gather 34, and stand up using the contraction force of the elastic elastic members. That is, the elastic elastic member is fixed to the sheet material on the three-dimensional gather 34 in an extended state, and when the elastic elastic member contracts, the sheet material of the three-dimensional gather 34 also contracts and the three-dimensional gather 34 stands up. The position at which the elastic elastic member is disposed in the three-dimensional gather 34 can be changed as appropriate according to the form of the three-dimensional gather and the shape and size of the disposable diaper. Established.

As shown in FIG. 3, each of the three-dimensional gathers 34 may have two gather portions, that is, an inner three-dimensional gather 341 and an outer three-dimensional gather 342. One or a plurality of elastic elastic members 35b that are extended along the longitudinal direction are disposed at the tip of the inner three-dimensional gather 341. For this reason, the inner three-dimensional gathered portion 341 stands while tilting inward toward the absorber 31 with the fixing line P with the top sheet 32 as a starting point.
The length of the standing portion of the inner three-dimensional gather 341 (the length from the fixed line P to the upper edge) is, for example, 10 mm to 100 mm, or 20 mm to 80 mm, preferably 30 mm to 60 mm.
The front end portion of the inner three-dimensional gather 341 means, for example, a portion from the upper 1/3 to 1/7 of the height from the fixed line P to the front end.

  In FIG. 3, the front end of the sheet material forming the inner three-dimensional gather 341 is folded back toward the outside of the absorber 31, and the sheet material has a double structure in part. Then, the elastic elastic member 35b is held in an extended state between the double-structured sheet materials, and is fixed by, for example, a hot melt adhesive. For example, the elastic elastic member 35b is arranged in the folded portion of the inner three-dimensional gather 341 in a state where the elastic expansion member 35b is stretched to a size 1.5 to 5 times (1.5 to 5 times) the size in the non-stretched state. It is pinched. The folding width of the tip of the inner three-dimensional gather 341 may be, for example, the upper part 1/3 to 1/7 of the height from the fixed line P to the tip of the inner three-dimensional gather 341.

  Alternatively, the sheet material forming the inner three-dimensional gather 341 may be folded outward or inward of the absorber 31 so that the sheet material has a double structure over the entire standing part where the inner three-dimensional gather 341 stands. Good. Further, the sheet material forming the inner three-dimensional gather 341 is folded back toward the inside of the absorbent body 31 at a position corresponding to the tip of the inner three-dimensional gather 341, and the folded sheet material is brought into contact with the top sheet 1. The sheet material and the top sheet 1 may be folded and fixed. In this case, the elastic expansion / contraction member 35b is disposed in an extended state in the vicinity of the distal end portion of the inner three-dimensional gather 341.

Further, the outer three-dimensional gather 342 is formed outside the absorber 31 than the inner three-dimensional gather 341. One or a plurality of elastic elastic members 35c that are extended along the longitudinal direction are also provided at the tip of the outer three-dimensional gather 342. The outer three-dimensional gather 342 may be provided with a plurality of elastic elastic members 35c over the entire sheet material forming the outer three-dimensional gather 342. The outer three-dimensional gather 342 is formed so as to incline to the outside of the absorber 31 in a state where the elastic elastic member 35c is not provided. Tilt toward the outside of the body 31.
The length of the standing part of the outer three-dimensional gather 342 is, for example, 10 mm to 100 mm, or 20 mm to 80 mm, preferably 30 mm to 60 mm.
In addition, the front-end | tip part of the outside three-dimensional gather 342 also means the part from the upper part 1/3 to 1/7 of the height from the fixed line P to the front-end | tip.

  The inner three-dimensional gather 341 and the outer three-dimensional gather 342 may be formed by separate sheet materials, or may be formed by a single sheet material (side sheet). In the embodiment shown in FIG. 3, an example in which the inner three-dimensional gather 341 and the outer three-dimensional gather 342 are formed by folding one side sheet having water repellency in the width direction is shown.

  As shown in FIG. 3, a part of the side sheet forming the inner three-dimensional gather 341 and the outer three-dimensional gather 342 is adhered to the bottom surface of the side edge portion of the back sheet 33 along the longitudinal direction of the back sheet 33. . The side edge portion of the side sheet is sandwiched between the back sheet 33 and the cover sheet 55 and bonded by, for example, a hot melt adhesive.

  Further, the side sheet extends from the side edge of the back sheet 33 toward the outside of the absorber 31. The side sheet extending toward the outside of the absorber is folded back toward the inside of the absorber 31 at the first folding portion 41. One or a plurality of elastic elastic members 35c in an expanded state are sandwiched and fixed between the side sheets folded back at the first folding part 41 along the longitudinal direction of the side sheets. As shown in FIG. 3, the side seat has a double structure from the first folded portion 41 to the side edge of the back seat 33. As described above, since the elastic elastic member 35b is sandwiched in the first folded portion 41, the side sheet having a double structure from the first folded portion 41 to the side edge of the back sheet 33 is fixed to the fixed line P. Standing from the starting point. Thereby, the outer solid gather 342 is formed.

  The side sheet folded back at the first folding part is fixed to the surface of the top sheet 32 at a fixing line P formed along the longitudinal direction on the side edge of the top sheet 32, and the top sheet 32 and the back sheet 33 side edges are sandwiched. The side sheet extends from the fixed line P toward the inside of the absorber 3. The side sheet extending inside the absorbent body is folded back toward the inside or the outside of the absorbent body at the second folded portion 42. One or a plurality of elastic elastic members 35a in an extended state are sandwiched and fixed between the side sheets folded back at the second folding section 42 along the longitudinal direction of the side sheets. As shown in FIG. 3, the side seat has a double structure from the second folded portion 42 to the side edge of the side seat. Thus, since the elastic elastic member 35a is sandwiched in the second folded portion 42, the side sheet extending from the fixed line P toward the inside of the absorber 3 stands up with the fixed line P as a starting point. Thereby, the inner solid gather 341 is formed.

  In this way, the three-dimensional gather 34 including the inner three-dimensional gather 341 and the outer three-dimensional gather 342 can be formed from one side sheet having water repellency.

  3B, the distance from the fixed line P to the tip of the inner three-dimensional gather 341 is F, the distance from the fixed line P to the outer three-dimensional gather 342 is S, and both sides of the absorber 3 When the distance between the fixed lines P formed in the part is W, it is preferable that S <F <2S and 2S <W <7S. When this relationship is satisfied, the angle at which the inner three-dimensional gather 341 and the outer three-dimensional gather 342 rise and the degree of close contact between the inner three-dimensional gather 341 and the outer three-dimensional gather 342 and the wearer's skin are most suitable. However, even if the distance F, the distance S, and the distance W do not completely match the above relationship, if the above relationship is satisfied by correcting each distance within ± 5%, The angle at which the inner three-dimensional gather 341 and the outer three-dimensional gather 342 stand up and the degree of close contact with the wearer's skin were suitable.

  As the sheet material constituting the three-dimensional gather 4, a material having water repellency is used. As an example of the water-repellent material, it is preferable to use a nonwoven fabric such as spunbond or card emboss from the viewpoint of high water repellency and good air permeability. In particular, it is preferable to use a clogged nonwoven fabric such as SMS (spunbond / meltblown / spunbond) or SMMS (spunbond / meltblown / meltblown / spunbond) because of its high water pressure resistance.

(2-2-5. Elastic elastic member)
The elastic expansion / contraction member 35 is a member disposed at an appropriate position of the absorbent main body 3 in order to erect the member in which the elastic expansion / contraction member 35 is disposed or to form a gather by its contraction force. As described above, the elastic stretchable member 35 is disposed on the members constituting the three-dimensional gather 34.

  In the present invention, at least along the longitudinal direction of the absorbent main body 3, the tangent line T between the top sheet 32 and the back sheet 33 and the standing region R that is the region between the fixed line P between the top sheet 32 and the three-dimensional gather 34 are provided. One elastic elastic member 35a is disposed in an extended state. More specifically, the standing region R is the vertical line from the tangent T between the top sheet 32 and the back sheet 33 toward the bottom surface of the absorbent article 3 and the fixing of the top sheet 32 and the three-dimensional gather 34. An area between the line P and a perpendicular line from the line P toward the bottom surface of the absorbent article 3 is an area having a width, a height, and a depth. As described above, the elastic stretchable member 35a is disposed in the standing region R, so that the entire three-dimensional gather 34 including the inner three-dimensional gather 341 and the outer three-dimensional gather 342 can be obtained using the contraction force of the elastic stretchable member 35a. , Lifts up in the direction of contact with the wearer's skin (upward in FIG. 3). Accordingly, the degree of adhesion between the three-dimensional gather 34 and the wearer's skin is increased, and the leak-proof property of the absorbent main body 3 is also improved.

  Moreover, the elastic expansion-contraction member 35a is good also as arrange | positioning between the back seat | sheet 33 and the side seat | sheet which forms the three-dimensional gather 34, as shown in FIG. Further, the number of elastic elastic members 35a disposed in the standing region R may be one or a plurality. 1-5 elastic elastic members 35a may be disposed in the standing region.

  Further, the elastic stretchable member 35 a disposed in the standing region R has higher stress than the elastic stretchable member 35 c disposed at the distal end portion of the outer three-dimensional gather 341, and the elastic stretch member 35 a disposed at the distal end portion of the outer three-dimensional gather 341. The elastic member 35c may have a higher stress than the elastic elastic member 35b disposed at the tip of the inner three-dimensional gather 342. That is, the stress relationship of the elastic elastic member may be 35a> 35c> 35b. At this time, the stress of the elastic elastic member 35 is not a case where the stress of each elastic elastic member 35 arranged in each part is compared, but the case where the elastic elastic members 35 arranged in each part are grouped. Compare the stresses. Moreover, the stress of the elastic elastic member 35 arrange | positioned at each site | part compares the stress with respect to the force which pulls the disposable diaper 10 (or absorptive main body 3) to a longitudinal direction.

  The stress of the elastic elastic member 35 disposed in each part can be appropriately adjusted by changing the number and materials of the elastic elastic members 35 disposed in each part. That is, for example, the greater the number of elastic elastic members 35 arranged at a certain part, the higher the stress of the elastic elastic member 35 at that part. Further, if the elastic stretchable member 35 disposed at a certain part is formed of a material having a strong stress against the tensile force, the stress of the elastic stretchable material 35 at that part becomes high.

  Moreover, it is good also as arrange | positioning the some elastic member 35 formed with the material from which stress differs in each site | part (the standing area | region R, the front-end | tip part of the outer three-dimensional gather 341, and the front-end | tip part of the outer three-dimensional gather 341). . In this case, for example, the average values of the stresses of the elastic elastic members 35 disposed in the respective parts are compared. The strength of the stress (tensile force) is measured using a known method and a known apparatus.

  Usually, a thread-like elastic rubber is applied to the elastic elastic member 35. As such a rubber material, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used. The material for forming the elastic stretchable member 35 is not necessarily limited to the material, and various known stretchable materials such as a thermoplastic elastomer, a plastic sheet, and a rubber sheet can be used. It is particularly preferable to use a thermoplastic elastomer. Examples of the thermoplastic elastomer include styrene elastomers, olefin elastomers, polybutadiene elastomers, polyester elastomers, polyamide elastomers, urethane elastomers, vinyl chloride elastomers, and fluorine elastomers. , Ionomer resins, silicone resins, and the like can be used. These thermoplastic elastomers may be used alone or in combination of two or more.

(3. Modified examples)
FIG. 4 is a schematic cross-sectional view showing a modification of the absorbent main body according to the present invention. In the example shown in FIG. 4, unlike the example shown in FIG. 3, the tips of the inner three-dimensional gather 341 and the outer three-dimensional gather 342 are bent toward the outside of the absorber 3.

  As described above, in order to turn the tip of the inner three-dimensional gather 341 and the tip of the outer three-dimensional gather 342 outward, the stress of the elastic elastic member 35 on the tip side is applied to the elastic elastic member 35 on the base side of the three-dimensional gather. It may be lower than the stress.

  As shown in FIG. 4, a plurality of elastic elastic members 35 b are arranged in the extended state along the longitudinal direction of the inner three-dimensional gather 341 at the tip of the inner three-dimensional gather 341. And the stress of the elastic elastic member 35b arrange | positioned in the position nearest to the front-end | tip of the inner three-dimensional gather 341 is the lowest among several elastic elastic members 35b. Moreover, the stress of the elastic elastic member 35b arrange | positioned in the position furthest from the front-end | tip of the inner three-dimensional gather 341 among the plurality of elastic elastic members 35b is the highest. Therefore, when the elastic expansion / contraction member 35b contracts, the distal end side of the inner three-dimensional gather 341 contracts weakly and the base side of the inner three-dimensional gather 341 contracts strongly, so that the distal end side of the inner three-dimensional gather 341 is bent outward. Thus, it is preferable that the angle α formed when the inner solid gather 341 is bent outward is, for example, 30 degrees to 150 degrees, 50 degrees to 120 degrees, and 70 degrees to 100 degrees.

  On the other hand, similarly to the inner three-dimensional gather 341, a plurality of elastic elastic members 35 c are arranged in the extended state along the longitudinal direction of the outer three-dimensional gather 342 at the tip of the outer three-dimensional gather 342. And the stress of the elastic elastic member 35c arrange | positioned in the position close | similar to the front-end | tip of the outermost three-dimensional gather 342 is the lowest among several elastic elastic members 35c. Moreover, the stress of the elastic elastic member c arrange | positioned in the position far from the front-end | tip of the outermost three-dimensional gather 342 among several elastic elastic members 35c is the highest. Therefore, when the elastic expansion / contraction member 35c contracts, the distal end side of the outer three-dimensional gather 342 contracts weakly and the base side of the outer three-dimensional gather 342 contracts strongly, so that the distal end side of the outer three-dimensional gather 342 is bent outward. Thus, it is preferable that the angle β formed when the outer solid gather 342 is bent outward is, for example, 50 degrees to 170 degrees, 70 degrees to 140 degrees, and 90 degrees to 120 degrees.

  The disposable diaper according to the present invention can be applied to diapers for infants and the elderly. Therefore, the present invention can be suitably used in industries related to childcare and nursing care.

DESCRIPTION OF SYMBOLS 1 Front body exterior body 2 Rear body exterior body 3 Absorbent main body 10 Disposable diaper 31 Absorbent body 32 Top sheet 33 Back sheet 34 Three-dimensional gather 35 Elastic expansion-contraction member 41 1st folding | returning part 42 2nd folding | returning part 341 Inside 3rd gather 342 Outside three-dimensional gather 51 Side flap 52 Waist opening 53 Leg opening 54 Hip elastic elastic member 55 Cover sheet T Tangent P Fixed line R Standing region

Claims (6)

A front body exterior body (1) that contacts the wearer's abdomen, a rear body exterior body (2) that contacts the back of the wearer, and at least a front end joined to the front body exterior body (1) and at least a rear end In a disposable diaper comprising an absorbent main body (3) to be joined to the back body exterior body (2),
The absorbent main body (3)
An absorber (31) for absorbing and holding liquid;
A liquid-permeable top sheet (32) covering the absorbent body (31) from the side in contact with the wearer's skin;
A tangent line (T) that covers the absorbent body (31) from the side opposite to the top sheet (32) and adheres to the top sheet (32) along both side edges of the absorbent body (31). A liquid-impermeable backsheet (33) having,
A pair of three-dimensional gathers (34) formed on both side edges of the absorbent main body (3) and fixed on a fixing line (P) formed along the longitudinal direction of the top sheet (32);
Standing region (R) which is a region between the tangent line (T) of the top sheet (32) and the back sheet (33) and the fixed line (P) of the top sheet (32) and the three-dimensional gather (34) A disposable diaper comprising at least one elastic elastic member (35a) disposed in a stretched state along the longitudinal direction of the absorbent main body (3).
Each of the pair of three-dimensional gathers (34)
A part of the side sheet forming the three-dimensional gather (34) is adhered to the bottom surface of the back sheet (33) along the longitudinal direction of the side edge of the back sheet (33), and the top sheet (32) Is fixed on a fixing line (P) formed along the longitudinal direction of the sheet, thereby sandwiching the back sheet (33) and the top sheet (32),
The elastic elastic member (35a)
The disposable diaper according to claim 1, wherein the disposable diaper is disposed between the back sheet (33) and the side sheet that is the standing region (R) and forms the three-dimensional gather (34).
Each of the pair of three-dimensional gathers (34)
Including inner solid gather (341) and outer solid gather (342),
The inner three-dimensional gather (341)
At least one elastic elastic member (35b) extending along the longitudinal direction is disposed at the front end of the inner three-dimensional gather (341), so that a fixed line with the top sheet (32) ( P) standing up and tilting inward of the absorber (31),
The outer three-dimensional gather (342)
An elastic elastic member (35c) is formed on the outer side of the absorber (31) with respect to the inner three-dimensional gather (341), and is extended along the longitudinal direction at the tip of the outer three-dimensional gather (342). 3. The disposable diaper according to claim 1, wherein the disposable diaper stands up at the fixed line (P) and tilts toward the outside of the absorber (31) by being disposed one by one.
Each of the pair of three-dimensional gathers (34) is formed of one side sheet having water repellency,
The side seat is
A part thereof is adhered to the bottom surface of the side edge of the backsheet (33) along the longitudinal direction of the backsheet (33),
Folded toward the inside of the absorber (31) at the first folded portion (41) located outside the absorber (31) from the side edge of the backsheet (33),
At least one elastic elastic member (35c) in an extended state is sandwiched between the first folded portion (41) along the longitudinal direction of the side sheet, thereby the first folded portion (41). Is standing,
The side sheet folded back at the first folding part (41) is:
A part thereof is fixed to the surface of the top sheet (32) at a fixing line (P) formed along the longitudinal direction of the side edge of the top sheet (32),
In the second folded portion (42), the absorbent body (31) is folded toward the inside or the outside,
At least one elastic elastic member (35b) in an extended state is sandwiched in the second folded portion (42) along the longitudinal direction of the side sheet, thereby the second folded portion (42). Is standing,
The disposable diaper according to claim 3, wherein the inner three-dimensional gather (341) and the outer three-dimensional gather (342) are thereby formed by a single side sheet.
A plurality of elastic elastic members are arranged in an extended state along the longitudinal direction of the inner three-dimensional gather (341) at the tip of the inner three-dimensional gather (341).
Among the plurality of elastic elastic members, the elastic elastic member disposed at the position closest to the tip of the inner three-dimensional gather (341) has the lowest stress,
The disposable diaper according to claim 3 or 4, wherein an elastic elastic member disposed at a position farthest from a tip of the inner three-dimensional gather (341) among the plurality of elastic elastic members has the highest stress.
A plurality of elastic elastic members are arranged in an extended state along the longitudinal direction of the outer three-dimensional gather (342) at the tip of the outer three-dimensional gather (342).
Among the plurality of elastic elastic members, the elastic elastic member disposed at a position closest to the tip of the outer three-dimensional gather (342) has the lowest stress,
The elastic elastic member disposed at a position farthest from the tip of the outer three-dimensional gather (342) among the plurality of elastic elastic members has the highest stress. Disposable diapers.

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