JP5592714B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a pants-type disposable diaper.

  Conventionally, a pants-type disposable diaper having a trunk opening at the upper end and a pair of leg openings at the lower part has been used as one of the absorbent articles that receive excrement from the wearer. In such a disposable diaper, in the exterior sheet in which the front part covering the front side of the wearer and the rear part covering the rear side are continuous via the intermediate part, both side ends of the front part are respectively joined to both side ends of the rear part. Thus, a trunk opening and a pair of leg openings are formed. In addition, an absorber that absorbs excrement from the wearer is mounted on the exterior sheet from the front portion to the rear portion, and a three-dimensional gather portion that stands on both sides of the absorber is formed (such as this As a disposable disposable diaper, for example, refer to Patent Document 1).

JP 2007-9779 A

  By the way, in order to absorb excrement appropriately in the absorber, it is preferable that the absorber is in close contact with the wearer's crotch. However, in wearing a pants-type disposable diaper, even if the disposable diaper is simply pulled up around the waist of the wearer, the absorbent body may not adhere to the wearer's crotch, and excrement will leak from the absorbent body. And excrement may leak out from around the legs.

  This invention is made | formed in view of the said subject, and aims at making an absorber adhere closely to a wearer's crotch part at the time of mounting | wearing.

The invention according to claim 1 is a pants-type disposable diaper having a trunk opening at the upper end and a pair of leg openings at the lower end, and a front part covering the front side of the wearer and a rear part covering the rear side Bending at the intermediate part between the two parts, both side ends of the front part are respectively joined to both side ends of the rear part, thereby forming a trunk opening at the upper end of the front part and the rear part, An outer sheet in which a pair of leg openings are formed on both sides of the intermediate part below the front part and the rear part, and a wearer attached to the outer sheet from the front part to the rear part. and a suction absorbent body excrement you absorption from the absorber, a body portion having an absorbent core, and a pair of side wall portions erected on both sides of at least the central region of the body portion, the pair A pair of side walls Each of the pair of elastic members is provided on a fixed end side of the first elastic element and a first elastic element provided along a free end that is a tip of the side wall portion that stands. A second elastic element, and the first elastic element is joined in an extended state from an end on the front part side to an end on the rear part side of the side wall part, and the second elastic element but the joined in the front portion side and extended state at one end of the rear portion side of the absorbent body, by the absence of a central portion of the absorbent body, said pair in said one end portion The contraction force of the elastic member is larger than the contraction force at the central portion of the absorber.

Invention of Claim 2 is a disposable diaper of Claim 1 , Comprising: In the said one edge part of the said absorber, a pair of said side wall part is piled up on the said main-body part, and is joined.

According to a third aspect of the invention, a disposable diaper according to claim 1 or 2, contraction force of the pair of elastic members at the ends of both of the front side and the rear side of the absorbent body However, it is larger than the contraction force in the central part of the absorber.

  ADVANTAGE OF THE INVENTION According to this invention, an absorber can be closely stuck to a wearer's crotch part at the time of mounting | wearing.

Further, Ru can increase the contractile force of the end portion of the front side or rear side of a pair of elastic members. In invention of Claim 2 , the center area | region of a main-body part can be pulled up efficiently, and in invention of Claim 3 , an absorber can be further closely_contact | adhered to a wearer's crotch part at the time of mounting | wearing.

It is a perspective view which shows the external appearance of a disposable diaper. It is a top view of the disposable diaper of the unfolded state. It is a figure which expands and shows the absorber vicinity. It is sectional drawing of a disposable diaper. It is a figure which shows the other example of a disposable diaper. It is a figure which shows the further another example of a disposable diaper.

  FIG. 1 is a perspective view showing an appearance of a disposable diaper 1 according to an embodiment of the present invention. As shown in FIG. 1, the disposable diaper 1 is a pants type having a trunk opening 11 at the upper end, which is the upper end in FIG. 1, and a pair of leg openings 12 in the lower part. Receive excrement. In addition, the up-down direction of FIG. 1 is not necessarily a gravity direction.

  FIG. 2 is a plan view of the disposable diaper 1 as seen from the wearer side in a developed state. As shown in FIG. 2, the disposable diaper 1 is a substantially sheet-like absorbent body that is mounted on the outer sheet 4 and the inner surface of the outer sheet 4 (that is, the surface on the wearer side) and absorbs excrement from the wearer. 20 and two sheet members 5 (also referred to as end sheets or end press sheets) joined on the exterior sheet 4 so as to cover both ends of the absorbent body 20 in the longitudinal direction (that is, the vertical direction in FIG. 2). ). Each sheet member 5 is provided over substantially the entire width of the exterior sheet 4 in the lateral direction of FIG. Hereinafter, the horizontal direction in FIG. 2 is referred to as a “diaper width direction”.

  In the disposable diaper 1, the upper part in FIG. 2 covers the wearer's front side (abdominal skin), and the lower part in FIG. 2 covers the wearer's rear side (skin on the back side). In the following description, the portions covering the front side and the rear side of the wearer are referred to as “front portion 401” and “rear portion 403”, respectively, and are continuous from both sides between the front portion 401 and the rear portion 403 and are worn by the wearer. The part facing the crotch part (the crotch part) is referred to as an “intermediate part 402”.

  When the disposable diaper 1 is manufactured, the exterior sheet 4 is bent together with the absorbent body 20 at the intermediate portion 402, and the left and right ends of the front portion 401 when the intermediate portion 402 is disposed on the lower side, and the rear The left and right ends of the part 403 are joined by heat fusion by heating and pressing. In this way, by joining the both side ends of the front portion 401 and the both side ends of the rear portion 403, as shown in FIG. 1, the trunk opening 11 is formed at the upper ends of the front portion 401 and the rear portion 403, A pair of leg openings 12 are formed on both sides of the intermediate portion 402 below the front portion 401 and the rear portion 403.

  3 is an enlarged view showing the vicinity of the absorbent body 20 in FIG. 2, and FIG. 4 is a cross-sectional view of the disposable diaper 1 cut at the position A-A shown in FIG. 3 (ie, the intermediate portion 402). It is. In FIG. 4, the structure of the disposable diaper 1 is drawn away from each other for the convenience of illustration.

  As shown in FIG. 4, the exterior sheet 4 includes an inner sheet 41 and an outer sheet 42 laminated on the inner sheet 41 on the lower side (that is, the side opposite to the wearer) of the inner sheet 41. As shown in FIG. 2, a plurality of leg-around elastic elements 43 and a plurality of waist-around elastic elements 44 are joined between the inner sheet 41 and the outer sheet 42 by a hot melt adhesive or the like. In the disposable diaper 1, when the leg elastic elements 43 contract, the inner sheet 41 and the outer sheet 42 (see FIG. 4) contract to form leg gathers. Moreover, a trunk | drum gather is formed because the trunk | drum circumference elastic element 44 shrinks | contracts. Among the plurality of waist elastic elements 44, some waist elastic elements 44 arranged in the vicinity of the edge of the body opening 11 (see FIG. 1) are closely arranged, and these waist elastic elements 44 Thus, the disposable diaper 1 fits strongly around the waist of the wearer.

  As shown in FIGS. 3 and 4, the absorbent body 20 is disposed on the substantially sheet-shaped main body 2 and on both sides of the main body 2 (that is, both ends in the width direction of the diaper), and the main body 2. A pair of side seats 3 is provided over substantially the entire length in the longitudinal direction. As shown in FIG. 4, the main body 2 includes a top sheet 21, a back sheet 23, and an absorbent core 22 disposed between the top sheet 21 and the back sheet 23. 3 and 2, the outline of the absorbent core 22 is drawn with a thick broken line in order to facilitate understanding of the drawings. As shown in FIG. 3, the width at both ends in the longitudinal direction of the absorbent core 22 is larger than the width at the center in the longitudinal direction of the absorbent core 22. In other words, the absorption core 22 has a so-called hourglass shape.

  4 is bonded onto the exterior sheet 4 with a hot melt adhesive or the like, and the absorbent body 20 is fixed to the exterior sheet 4. In the disposable diaper 1 of FIG. 2, the absorber 20 is arrange | positioned ranging from the front part 401 to the back part 403, and each edge part of the absorber 20 is pinched | interposed between the sheet | seat member 5 and the exterior sheet | seat 4, The absorber 20 is firmly fixed on the exterior sheet 4.

  As shown in FIG. 4, each side seat 3 has a belt-like joint 33 that is a part on the main body part 2 side and a second part with a fold line 39 provided over the entire length in the longitudinal direction as a boundary. A side wall 34 is provided. The joining portion 33 is joined to the upper side (that is, the wearer side) of the main body portion 2 using a hot melt adhesive over substantially the entire length in the longitudinal direction in the vicinity of the side edge of the main body portion 2.

  The side wall part 34 which continues from the joint part 33 via the fold line 39 is overlapped on the joint part 33 at both ends in the longitudinal direction, and is fixed on the joint part 33 with an adhesive such as hot melt. In FIG. 2, in order to facilitate understanding of the drawing, a portion 341 of the side wall portion 34 fixed on the joint portion 33 (hereinafter referred to as “side wall joint portion 341”) is hatched in parallel.

  Moreover, the side wall part 34 is provided with the standing part 342 which stands up from the main-body part 2 in the center in a longitudinal direction, as shown in FIG.2 and FIG.4. Specifically, in the side wall portion 34 shown in FIG. 4, an elastic element 35 (hereinafter referred to as “tip elastic element 35”) is joined in an extended state along the tip, that is, the free end, as shown in FIG. Thus, the tip elastic element 35 is provided over the entire length of the absorbent body 20 in the longitudinal direction. In the disposable diaper 1, when the distal elastic element 35 contracts, in each side wall portion 34, a portion between the side wall joint portion 341 on the front portion 401 side (see FIG. 2) and the side wall joint portion 341 on the rear portion 403 side. However, the upright part 342 stands up toward the wearer to form a three-dimensional gather.

  Further, in the side wall portion 34 shown in FIG. 4, a plurality of elastic elements 36 (to raise the central portion of the absorber 20, as will be described later) on the fixed end side (that is, the joint portion 33 side) with respect to the tip elastic element 35. Therefore, hereinafter referred to as “pull-up elastic element 36”). As shown in FIG. 3, the pulling elastic element 36 is provided at each of the end portions on the front portion 401 side and the rear portion 403 side of the absorber 20, and is joined to the side wall portion 34 in an extended state. With respect to the longitudinal direction of the absorbent body 20, the pulling elastic element 36 does not exist above (on the wearer side) an area 201 (hereinafter referred to as “center area 201”) that is near the center of the main body 2. That is, the pulling elastic element 36 is not present in the central portion of the absorbent body 20. Each pull-up elastic element 36 traverses the entire side wall joint 341 (see FIG. 2) in the longitudinal direction, and in this embodiment, the end of the pull-up elastic element 36 on the central region 201 side stands upright. Located on the portion 342.

  As shown in FIG. 3, when a set of the tip elastic element 35 and the pulling elastic element 36 disposed on each side of the absorbent body 20 is defined as an elastic member 37, the front part of the side wall part 34 is formed on the central region 201. Only the tip elastic element 35 extending from the end portion on the 401 side to the end portion on the rear portion 403 side is provided as the elastic member 37. Further, in the main body portion 2, the tip elastic element 35 and the plurality of pulling elastic elements are located above a region 202 (hereinafter referred to as “end region 202”) on the front portion 401 side and the rear portion 403 side of the central region 201. 36 is provided as an elastic member 37. As will be described later, in the present embodiment, the same polyurethane yarn is used as the tip elastic element 35 and the pull-up elastic element 36. Therefore, contraction force of each elastic member 37 at both ends of the front portion 401 side and the rear portion 403 side of the absorbent body 20 (that is, contraction force when the disposable diaper 1 is unfolded and extended as shown in FIG. 2). Is larger than the contraction force at the center of the absorbent body 20.

  In the disposable diaper 1 in FIG. 4, the end portion on the free end side of the side wall portion 34 in each side sheet 3 is folded inward and overlaps with other portions of the side wall portion 34, and between these overlapping portions. The tip elastic element 35 and the pulling elastic element 36 are joined and fixed. In the formation of the elastic member 37 in the present embodiment, four polyurethane yarns are joined in the stretched state over the entire length of the side wall portion 34 between the portions of the side wall portion 34. At this time, of the four polyurethane yarns, the three polyurethane yarns that become the pulling-up elastic element 36 are bonded to the side wall portion 34 only on the end region 202 and are not bonded to the side wall portion 34 on the central region 201. Is done. Then, the three elastic yarns are cut by ultrasonic vibration at a position on the central region 201, so that the pulling elastic element 36 is formed only on both end portions of the absorbent body 20 without making a hole in the side wall portion 34. Is formed. In addition, when it does not become a problem even if a micro hole is formed in the side wall part 34, the other method of cut | disconnecting a polyurethane thread | yarn with the side wall part 34 may be utilized.

  The top sheet 21 is a liquid-permeable sheet material that quickly captures the moisture of excrement from the wearer and moves it to the absorbent core 22. The top sheet 21 is, for example, a liquid-permeable nonwoven fabric formed of hydrophobic fibers (polypropylene, polyethylene, polyester, polyamide, nylon, etc.) whose surfaces are hydrophilically treated with a surfactant. Point bond nonwoven fabric, air-through nonwoven fabric, and spunbond nonwoven fabric are used. In addition, as the top sheet 21, a nonwoven fabric (for example, a spunlace nonwoven fabric) formed of hydrophilic fibers such as cellulose, rayon, or cotton may be used.

  The absorbent core 22 is made by mixing a hydrophilic fiber such as pulverized pulp fiber or cellulose fiber with a superabsorbent polymer (SAP (Super Absorbent Polymer)) or a superabsorbent material such as a superabsorbent fiber. It is formed by wrapping with a liquid-permeable nonwoven fabric or the like, and absorbs moisture that has passed through the top sheet 21 and quickly fixes it. Tissue paper, liquid-permeable nonwoven fabric, etc. that wraps hydrophilic fibers are joined to the hydrophilic fibers and water-absorbing material with a hot-melt adhesive, and the shape of the hydrophilic fibers is lost. Prevent later dropout). In the present embodiment, the absorbent core 22 includes pulp fibers and SAP.

  As the back sheet 23, a water-repellent or liquid-impervious nonwoven fabric (for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, an SMS (spunbond / meltblown / spunbond) nonwoven fabric) formed of hydrophobic fibers, A liquid-impervious plastic film is used to prevent excretion from reaching the back sheet 23 from exuding to the outside of the main body 2. When a plastic film is used for the back sheet 23, a plastic film having moisture permeability (breathability) may be used from the viewpoint of preventing the disposable diaper 1 from being stuffy and improving the wearer's comfort. preferable.

  As the sheet body of the side sheet 3, a water-repellent or liquid-impervious nonwoven fabric (for example, a spunbond nonwoven fabric, a melt blown nonwoven fabric, or an SMS nonwoven fabric) formed of hydrophobic fibers is used. As the tip elastic element 35 and the pull-up elastic element 36, for example, a polyurethane thread, a strip-like polyurethane film, a thread-like or strip-like natural rubber, and the like are used. In this embodiment, the polyurethane thread is used as the tip elastic element 35 and the pull-up elastic element 36. The elastic element 36 is used. Note that the number of elastic elements constituting the elastic member 37 may be arbitrarily changed.

  In addition, as the sheet member 5, a water-repellent or liquid-impervious nonwoven fabric formed of hydrophobic fibers as in the backsheet 23, or a nonwoven fabric formed of hydrophilic fibers as in the topsheet 21 Alternatively, a liquid-permeable nonwoven fabric formed of hydrophobic fibers subjected to hydrophilic treatment is used.

  As the inner sheet 41 and the outer sheet 42 of the exterior sheet 4, similarly to the back sheet 23, a water-repellent or liquid-impervious nonwoven fabric or plastic film formed of hydrophobic fibers is used, or these nonwoven fabrics. And a laminated sheet in which a plastic film is laminated. As a plastic film, what has moisture permeability (air permeability) is preferable. Further, as the inner sheet 41 and the outer sheet 42, similarly to the top sheet 21, a nonwoven fabric formed of hydrophilic fibers or a liquid-permeable nonwoven fabric formed of hydrophobic fibers subjected to hydrophilic treatment may be used.

  As the leg elastic element 43 and the waist elastic element 44, for example, as with the tip elastic element 35 and the pulling elastic element 36 of the side sheet 3, for example, a polyurethane thread, a band-shaped polyurethane film, a thread-shaped or band-shaped natural rubber, or the like. In the present embodiment, polyurethane yarn is used as the leg elastic element 43 and the waist elastic element 44.

  When the disposable diaper 1 shown in FIG. 1 is worn, after the legs of the wearer are inserted into the pair of leg openings 12 through the trunk openings 11, the disposable diaper 1 is pulled up to the circumference of the wearer's waist. It is done. At this time, due to the contraction of the pulling elastic element 36 (see FIG. 3) on the front portion 401 side and the rear portion 403 side, the central portion of the absorbent body 20 (the central region 201 of the main body portion 2) becomes upward (the wearer's head). The absorbent body 20 is brought into close contact with the wearer's crotch portion.

  As described above, in the disposable diaper 1 of FIG. 3, a pair of elastic members 37 extending along the longitudinal direction of the absorbent body 20 are provided on the pair of side wall sections 34 on both sides of the absorbent body 20 to absorb the absorbent body 20. The contraction force of the pair of elastic members 37 at both ends of the front part 401 side and the rear part 403 side of the body 20 is made larger than the contraction force at the center part of the absorber 20. Thereby, the center part of the absorber 20 is pulled up to the upper end (edge of the trunk | drum opening 11) side of the disposable diaper 1 at the time of mounting | wearing, and it adheres the absorber 20 easily to a wearer's crotch part (namely, absorber) 20), the excrement can be appropriately absorbed by the absorbent body 20.

  Moreover, in the disposable diaper 1, the front-end | tip elastic element 35 is joined in the expansion | extension state from the edge part by the side of the front part 401 of the absorber 20 to the edge part by the side of the back part 403, and the pulling-up elastic element 36 is the absorber. Joined in an extended state at each end of 20. Thereby, the contraction force of both the tip elastic element 35 and the pull-up elastic element 36 can be used at each end of the absorber 20 on the front part 401 side and the rear part 403 side, and the end of the elastic member 37 can be used. The contraction force in the part can be increased.

  Further, at both end portions of the absorbent body 20, the pair of side wall portions 34 are overlapped and joined to the main body portion 2 (that is, the side wall joint portion 341 is provided), whereby the side wall portion 34 becomes the main body portion 2. Compared with the case where it is not joined to the top, the central region 201 of the main body 2 can be efficiently pulled up.

The disposable diaper can be variously modified.

  In the disposable diaper 1, the pulling elastic element 36 is provided only at one end on the front portion 401 side and the rear portion 403 side of the absorber 20, and the contraction force of the pair of elastic members 37 at the one end portion is You may make it larger than the contraction force in the center part (and other edge part) of the absorber 20. FIG. Even in this case, the central portion of the absorbent body 20 can be pulled up to some extent by contraction of the pair of elastic members 37 at the one end portion, and the absorbent body 20 can be easily adhered to the crotch portion of the wearer. However, in order to make the absorbent body 20 more closely contact the wearer's crotch part, the contraction force of the pair of elastic members 37 at both the front part 401 side and the rear part 403 side of the absorbent body 20 is the absorbent body 20. It is preferable that it is larger than the contraction force in the central part.

  In the disposable diaper 1 of FIG. 4, the pulling elastic element 36 is provided on the side wall 34. For example, as illustrated in FIG. 5, the pulling elastic element 36 is bonded between the bonding portion 33 and the top sheet 21. Alternatively, the pulling elastic element 36 may be joined to the inside of the main body 2. Furthermore, as shown in FIG. 6, a part of the lifting elastic elements 36 a (the pulling elastic element 36 a farthest from the tip elastic element 35 in the example of FIG. 6) on each side portion of the absorbent body 20 is the absorbent body 20. May be provided over the entire length. Even in this case, the contraction force of the elastic member 37 in the end region 202 is larger than the contraction force in the central region 201, and the central portion of the absorbent body 20 (the central region 201 of the main body portion 2) is directed to the trunk opening 11 side. It is possible to raise.

  Moreover, in the disposable diaper 1 of FIG. 3, the front-end | tip elastic element 35 may be abbreviate | omitted. In this case, in the elastic member 37 constituted by the plurality of pull-up elastic elements 36, the contraction force at the central portion of the absorber 20 is zero. Further, a pair of elasticity at the end of the absorbent body 20 is provided by providing a band-like polyurethane film or natural rubber as an elastic member and making the width of the elastic member on the end region 202 larger than the width on the central region 201. The contraction force of the member may be made larger than the contraction force in the central portion of the absorbent body 20. As described above, the configuration of the elastic member for making the contraction force of the elastic member at the end of the absorber 20 larger than the contraction force at the center of the absorber 20 can be realized in various modes.

  In the disposable diaper 1 of FIG. 2, a pair of side wall portions 34 are overlapped and joined on the main body 2 at both ends of the absorbent body 20 (that is, the side wall joint portion 341 is provided). Depending on the design of 1, the side wall joint portion 341 at one end portion or both end portions is omitted, and the range of the standing portion (standing portion 342) of the side wall portion 34 is expanded in the longitudinal direction of the absorbent body 20. Also good. In the disposable diaper 1, the standing part 342 in each side wall part 34 is provided on the side part of at least the central region 201 of the main body part 2, thereby suppressing leakage of excrement from the side of the absorbent body 20. Even when the end portion of the side wall portion 34 in the longitudinal direction is not joined to the main body portion 2, the central region 201 of the main body portion 2 can be pulled up to some extent via the upright portion 342 by contraction of the pulling elastic element 36. It is.

  The configurations in the above-described embodiments and modifications may be combined as appropriate as long as they do not contradict each other.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Main body part 4 Exterior sheet 11 Trunk part opening 12 Leg part opening 20 Absorber 22 Absorption core 34 Side wall part 35 Tip elastic element 36, 36a Lifting elastic element 37 Elastic member 201 Central area 401 Front part 402 Middle part 403 Rear part

Claims (3)

A pants-type disposable diaper having a trunk opening at the top and a pair of leg openings at the bottom,
Bending at an intermediate portion between a front part covering the front side of the wearer and a rear part covering the rear side, both side ends of the front part are respectively joined to both side ends of the rear part, An exterior sheet in which a trunk opening is formed at the upper end of the rear part, and a pair of leg openings are formed on both sides of the intermediate part below the front part and the rear part,
A suction absorbent body you absorb excretion of the wearer is attached on the outer covering sheet over the rear portion from said front portion,
With
The absorber is
A main body having an absorbent core;
A pair of side walls standing on both sides of at least the central region of the main body,
A pair of elastic members provided on the pair of side wall portions;
Have
Each of the pair of elastic members is
A first elastic element provided along a free end that is a tip of a side wall portion that stands;
A second elastic element provided closer to the fixed end than the first elastic element;
Have
The first elastic element is joined in an extended state from an end on the front portion side to an end on the rear portion side of the side wall portion, and the second elastic element is connected to the front portion of the absorber. The elastic member is bonded in an extended state at one end on the side and the rear portion side, and is not present in the central portion of the absorber, so that the contraction force of the pair of elastic members at the one end is absorbed by the absorption A disposable diaper characterized by being larger than the contraction force in the central part of the body. The disposable diaper according to claim 1 ,
The disposable diaper characterized in that at the one end of the absorbent body, the pair of side wall portions are overlapped and joined on the main body portion. The disposable diaper according to claim 1 or 2 ,
A disposable diaper characterized in that a contraction force of the pair of elastic members at both ends of the front side and the rear side of the absorber is larger than a contraction force of a central part of the absorber.

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