JP6607778B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a diaper having a three-dimensional gather.

A three-dimensional gather of diapers is useful for preventing lateral leakage of excrement during an operation such as turning over or walking when the diaper is worn on a human body.
Patent Document 1 discloses an absorbent article including a liquid-retaining absorbent layer and a liquid-impermeable leak-proof layer, and a leak-proof portion arranged along the longitudinal direction. The leak-proof portion is a three-dimensional sheet having a corrugated cross-sectional shape in the longitudinal direction or the width direction disposed along the longitudinal direction of the absorbent article (see claim 6 of Cited Document 1). .

  Patent Document 2 discloses an absorbent article in which side cuffs are arranged along both side portions along the longitudinal direction of the absorbent main body. The side cuffs stand on the skin contact surface side. In the vicinity of the free end of each side cuff, a planar composite stretchable portion 4 that stretches in the width direction of the absorbent main body is arranged, and lateral wrinkles are generated when stretched in the width direction (see Reference 2). (See claim 1, paragraph [0017] etc.).

  Patent Document 3 discloses an absorbent article having a pair of side leakage preventing portions on both sides of an absorbent main body having an absorption layer and a leakage preventing portion. Each of the pair of side leak-proof portions is a three-dimensional sheet having a large number of joint portions in which at least a part of the first layer made of a nonwoven fabric and a second layer made of a sheet-like material are partly joined. In the three-dimensional sheet, the first layer protrudes toward the first layer in the portion other than the joint portion and forms a plurality of convex portions. The convex portions and the joint portions are alternately arranged in a row in one direction, and the rows are arranged in multiple rows. As for each of a pair of side leak-proof part, the surface orient | assigned to an absorption layer consists of the surface by the side of the 1st layer of a solid sheet (refer Claim 1 etc. of the cited reference 3).

JP 2003-153946 A JP 2008-136667 A JP 2008-148819 A

In the three-dimensional gather, irregular wrinkles are generated by expansion and contraction of an elastic member arranged at the front end portion in the width direction. However, no significant function is expressed in the wrinkles.
When a diaper wearer urinates while lying in a recumbent position, urine tends to accumulate in the standing base that is the rising portion of the three-dimensional gather. When the crotch portion of the absorbent body arranged in the diaper is constricted, the urine absorption capacity of the constricted portion is small, so that urine is more easily collected at the standing base portion of the three-dimensional gather. In this state, urine easily moves back and forth along the water-repellent three-dimensional gather, and urine may leak from the buttocks (back) side or the abdomen side.
Moreover, in the absorbent article described in Patent Document 1, the cross-sectional shape in the longitudinal direction of the leak-proof portion made of a three-dimensional sheet is formed in a corrugated shape. That is, the waveform which has a bowl-shaped convex part is distribute | arranged to the whole height direction of a leak-proof part. Therefore, when liquid is excreted in the central part of the absorber corresponding to the excretion position, the liquid accumulates at the rising part of the leak preventive part, and the liquid is on the buttocks side and the ventral side due to the corrugated shape. It becomes difficult to migrate. As a result, there was a possibility that the liquid was excessively accumulated and leaked, and there was room for improvement.
In the absorbent article described in Patent Document 2, wrinkles extending in the longitudinal direction are generated on both surfaces of the side cuff in the width direction on the front end side. However, no wrinkles are arranged on the absorber side of the rising portion of the side cuff (see FIG. 6 of cited document 2). For this reason, urine collected in the rising part of the side cuffs may move back and forth along the side cuffs and leak out from the buttocks side or the abdomen side, and there is room for improvement.
Furthermore, in the absorbent article described in Patent Document 3, no protrusions are arranged on the absorber side of the rising portion of the side leakage preventer (see FIG. 2 of Cited Document 3). For this reason, urine collected at the rising portion of the side leakage preventing portion may move back and forth along the side leakage preventing portion, and urine may leak from the buttocks side or the abdominal side, leaving room for improvement.

  The present invention prevents leakage of urine from the crotch, suppresses urine from moving to the buttocks (back) side and the abdomen along the three-dimensional gather, and prevents urine leakage from the buttocks (back) side and the abdomen. It is an object to provide an absorbent article to be prevented.

The present invention relates to an absorbent main body having a top sheet, a back sheet, and an absorbent body sandwiched between the two sheets, and a pair of the main body disposed so as to be able to stand in the longitudinal direction on both sides in the width direction of the absorbent main body. An absorbent article provided with a three-dimensional gather,
The pair of three-dimensional gathers has an uneven region in which concave portions and convex portions are repeatedly arranged in the longitudinal direction on the upright base portion side of the surface on the absorbent main body side,
The uneven area is arranged at least in the rear part of the three-dimensional gather where the wearer's buttocks side is located when the absorbent article is worn,
In the state where the three-dimensional gathers are stretched, the heights of the convex portions of the concave and convex regions arranged on the front and rear parts of the three-dimensional gathers located on the abdomen side of the wearer are the crotch part of the wearer In the case where the uneven area is arranged in the middle part of the three-dimensional gather located in the area, it is equal to or higher than the height of the convex part of the uneven area in the intermediate part, or the uneven area is not arranged in the intermediate part Then, the absorbent article higher than this intermediate part is provided.

  The absorbent article of the present invention prevents urine leakage from the crotch and suppresses urine from moving to the buttocks (back) side and the abdomen along the three-dimensional gathers, so that the buttocks (back) side and the abdomen side It has an excellent effect of preventing urine leakage from the urine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a drawing showing a tape-type adult disposable disposable diaper as a preferred embodiment of the disposable diaper of the present invention. (A) is the expansion | deployment top view shown typically from the skin surface side (surface sheet side) of the state which expand | deployed the expansion | deployment type disposable diaper. (B) is the longitudinal cross-sectional view which showed the II cross section of the X direction of the crotch part of (a). It is the expanded longitudinal cross-sectional view which showed the II-II cross section of Fig.1 (a) which showed typically a preferable example of a flap part and a fastening part. It is a top view of the solid gathers which showed an example of preferable embodiment of an uneven | corrugated area | region. (A) is the top view which showed an example which has arrange | positioned the uneven | corrugated area | region to the front part and back part at the standing base part side of a three-dimensional gather. (B) is the front view which showed an example which distribute | arranged the uneven | corrugated area | region from the front part to the back part through the center part to the standing base part side of a three-dimensional gather. (C) is an example in which an uneven area is arranged from the front part to the rear part on the standing base side of the three-dimensional gather, and the height of the central convex part is lower than the convex part of the front part and the rear part. It is the top view which showed. (D) is the expanded longitudinal cross-sectional view which abbreviate | omitted and showed a part of III-III cross section of (c) figure. It is a longitudinal cross-sectional view of the uneven | corrugated area | region for demonstrating the measuring method of the height of a convex part. It is the top view which showed an example of another preferable embodiment of an uneven | corrugated area | region. (A) is the top view which showed the example which distribute | arranged the uneven | corrugated area | region intermittently of the width direction from the front part to the rear part through the center part to the standing base part side of a three-dimensional gather. (B) is the top view which showed an example which carried out the staggered arrangement | positioning of the uneven | corrugated area | region from the front part to the back part on the standing base part side of a three-dimensional gather. It is the longitudinal cross-sectional view which showed the longitudinal direction cross section which showed an example of preferable another embodiment of an uneven | corrugated area | region. It is the top view which showed an example of another preferable embodiment of an uneven | corrugated area | region.

  A preferred embodiment (first embodiment) of a disposable diaper as an absorbent article according to the present invention will be described below with reference to FIGS. 1 and 2. In addition, illustration of the three-dimensional gathered elastic body 71 was abbreviate | omitted in Fig.1 (a).

  In this specification, unless otherwise specified, the side in contact with the human body is referred to as the skin contact surface side, and the opposite side is referred to as the non-skin contact surface side. The direction from the wearer's abdominal side to the back side through the excretory part corresponding region at the time of wearing is referred to as the longitudinal direction (Y direction) of the absorbent article. The direction orthogonal to the longitudinal direction is referred to as the width direction (X direction). A direction perpendicular to the longitudinal direction and the width direction of the absorbent article is referred to as a thickness direction (Z direction), and a length in the Z direction is referred to as thickness.

  FIG. 1 shows a developed state of the tape-type diaper 10 of the present embodiment. Here, the unfolded state refers to a state in which each part is extended to expand the absorbent article in a planar shape.

As shown in FIGS. 1 and 2, the tape-type diaper 10 is an unfolded disposable tape-type diaper that includes the absorbent main body 4 and is substantially vertically long. The absorbent main body 4 includes a top sheet 1 disposed on the skin contact surface side, a back sheet 2 disposed on the non-skin contact surface side, and a liquid-retaining absorbent body 3 interposed between the two sheets. Have
The tape-type diaper 10 is divided into a front part F that contacts the abdomen area of the wearer, a middle part C located in the crotch area of the wearer, and a rear part R that contacts the buttocks of the wearer. When each part cannot be clearly distinguished from the shape of the tape-type diaper 10, the tape-type diaper 10 is divided into three equal parts in the longitudinal direction (Y direction). And it divides into the front part F, the intermediate part C, and the rear part R in an order from the area | region distribute | arranged to a wearer's ventral side. Hereinafter, the tape-type diaper 10 is also simply referred to as a diaper 10.

  On the skin contact surface side of the topsheet 1, a pair of sidesheets 7 is arranged from both sides in the longitudinal direction (Y direction) toward the outside in the width direction (X direction).

  A solid gather elastic body 71 is disposed on the side end of the side seat 7 in the width direction on the absorbent main body 4 side. By the side sheet 7 and the three-dimensional gather elastic body 71, the three-dimensional gather 41 is formed on the skin contact surface side of the top sheet 1.

That is, one side edge of each of the pair of three-dimensional gathers 41 is fixed to both side portions in the longitudinal direction of the absorbent main body 4 to form an upright base portion 41 b of the three-dimensional gather 41. The standing base 41b refers to a rising portion of the three-dimensional gather 41 on the absorbent main body 4 side. Each three-dimensional gather 41 has a strip shape extending in the longitudinal direction (Y direction) of the diaper 10. The free end 41f of the three-dimensional gather 41 is folded back along the longitudinal direction of the side sheet 7. One or a plurality of three-dimensional gather elastic bodies 71 are fixed and arranged in an extended state between the folded side sheets 7. For this reason, in the three-dimensional gather 41, the free end 41f side is separated from the topsheet 1 and the like and rises toward the wearer's skin side by the contraction force of the three-dimensional gather elastic body 71 arranged on the free end 41f side. The free end 41f is an end side opposite to the upright base portion 41b in the width direction of the three-dimensional gather 41.
Note that the three-dimensional gather 41 shows a lying state in FIG. 1A, and shows a standing state in FIG. 1B. In FIG. 1A, the three-dimensional gathered elastic body 71 is not shown.

The pair of three-dimensional gathers 41 has a concavo-convex region 44 on the upright base 41b side of the surfaces (inner sides) facing each other in a standing state. The uneven region 44 is a region in which the concave portions 42 and the convex portions 43 are repeatedly arranged at least in the longitudinal direction.
The uneven | corrugated | grooved area | region 44 is distribute | arranged at least to the back part R of a wearer's buttocks side rather than the intermediate part C which opposes a wearer's crotch part when the diaper 10 of an absorbent article is worn.

As shown in FIGS. 3A to 3C, the diaper 10 of the absorbent article having the above-described configuration is provided with an uneven region 44 on the upright base 41 b side of the three-dimensional gather 41. The concavo-convex region 44 is a region in which the concave portions 42 and the convex portions 43 are repeatedly arranged at least in the longitudinal direction (YG direction). By providing such a concavo-convex region 44, urine that easily collects on the upright base 41b side of the three-dimensional gather 41 is less likely to flow to the front portion F side and the rear portion R side at the same time. In particular, in the front part F and the rear part R, since the flow of urine is suppressed by the uneven region 44, urine is easily absorbed by the absorber 3. For this reason, urine leakage from the front part F side and the rear part R side is prevented. The urine here includes liquid soft stool.
Hereinafter, the longitudinal direction (YG direction) of the three-dimensional gather 41 is the same direction as the longitudinal direction (Y direction) of the absorbent article. The width direction (XG direction) of the three-dimensional gather 41 is the same direction as the width direction (Y direction) of the absorbent article in a state where the three-dimensional gather 41 is lying down.

  Furthermore, as shown in FIG. 3A, in the case where the uneven region 44 is not arranged in the central portion C, urine collected in the upright base portion 41b becomes easier to flow to the front portion F side and the rear portion R side than the above. Even in this case, urine is transferred from the central part C to the front part F and the rear part R on the standing base 41b side of the three-dimensional gather 41. Moreover, similarly to the above, since the flow of urine is suppressed by the uneven regions 44 of the front part F and the rear part R, absorption of urine into the absorber 3 at the front part F and the rear part R is promoted, and the front part Urine leakage from the F side and the rear portion R side is prevented.

In an absorbent body with a constricted crotch, the amount of urine absorbed in the crotch is slightly reduced. Therefore, as shown in FIG. 3C, the height of the convex portion 43 (43C) of the uneven region 44 (44C) arranged in the three-dimensional gather 41 in the central portion C in the state where the three-dimensional gather is extended to another The height is made lower than the height of the convex portion 43 (43F, 43R) in the region. As a result, urine collected in the upright base portion 41b of the three-dimensional gather 41 at the crotch portion easily flows to the front portion F side and the rear portion R side. Therefore, urine is transferred from the central part C of the crotch part to the front part F on the abdominal side and the rear part R on the buttocks side on the standing base part 41b side of the three-dimensional gather 41. Similarly to the above, since the flow of urine is suppressed by the uneven region 44 (44F, 44R) in the front part F and the rear part R, the urine is absorbed by the entire absorber 3, and the front part F side and the rear part Urine leakage from the part R side is prevented. In this case, even if it is the absorber 3 which does not have a constriction in the center part C of an absorber, the same effect is show | played.
The state in which the above-mentioned three-dimensional gather is stretched is a state in which the three-dimensional gather is stretched and expanded until it reaches the design dimension (the same as the dimension when it is flattened in a state where the influence of the elastic member is completely eliminated). means.

  As described above, the uneven region 44 is preferably arranged in the front part F and the rear part R. This case is particularly effective for an absorbent article having the absorbent body 3 with a constricted crotch part. That is, in the absorbent body 3 having a constricted crotch part, the amount of urine absorbed at the crotch part is reduced. Therefore, it is preferable to transfer urine to the front part F and the rear part R. However, it is necessary to prevent urine from flowing out from the front portion F side and the rear portion R side. Therefore, the uneven region 44 slows the flow of urine in the front part F and the rear part R. That is, by making time for the flow of urine, the absorption of urine into the absorber 3 at the front part F and the rear part R having a larger urine absorption capacity than the center part corresponding to the crotch part is promoted. be able to. Thus, the urine leakage from the front part F side and the rear part R side is prevented by making the absorber 3 absorb urine. The above-described effects are not limited to the absorber having a constricted position corresponding to the crotch part, but are also exerted on an absorber having a rectangular shape or similar shape.

As shown in FIG. 3A, the uneven region 44 is not arranged in the intermediate portion C, and both the front portion F and the rear portion R are on the upright base portion 41 b side in the width direction (XG direction) of the three-dimensional gather 41. It is preferable to be arranged in a half area. Or as shown in FIG.3 (b), the uneven | corrugated area | region 44 is a rear part through the intermediate part C from the front part F of the 1/2 area | region of the standing base 41b side of the width direction (XG direction) of the three-dimensional gather 41. It may be arranged over R. In particular, as shown in FIGS. 3C and 3D, the unevenness of the intermediate portion C is higher than the heights of the convex portions 43F of the uneven region 44F of the front portion F and the convex portions 43R of the uneven region 44R of the rear portion R. It is more preferable that the height of the convex portion 43C in the region 44C is low.
Further, since the uneven region is arranged only in a half region on the side of the standing base 41b in the width direction (XG direction) of the three-dimensional gather 41, urine leakage from the free end 41f side is suppressed, and the standing base 41b The urine can be easily collected on the side. This helps to prevent urine from leaking from the front part F and the rear part R.

  As shown in FIG. 4, the height H of the convex portion 43 is determined from the height Ht from the plane Sf to the top 43T of the convex portion 43 in a state where the three-dimensional gather 41 is extended on the plane Sf. A value obtained by subtracting the thickness Hb of the region 45 excluding the uneven region 44 is used.

From the viewpoint of preventing urine leakage from the front part F side and the rear part R side, the height of the convex part 43 of the front part F and the rear part R is 1 mm or more, preferably 2 mm or more, and more preferably 3 mm or more. preferable. And from a viewpoint of preventing urine leakage, it is 20 mm or less, 15 mm or less is preferable and 10 mm or less is more preferable. More specifically, they are 1 mm or more and 20 mm or less, 2 mm or more and 15 mm or less are preferable, and 3 mm or more and 10 mm or less are more preferable. When the height of the convex portion 43 of the intermediate portion C is lower than the height of the convex portion 43 of the front portion F and the rear portion R, the following occurs. The height of the convex portion 43 of the intermediate portion C is 0 mm or more, preferably 1 mm or more, more preferably 2 mm or more from the viewpoint of not preventing movement of urine to the front portion F and the rear portion R having larger absorption capacity. preferable. And from a viewpoint that the movement of urine is not hindered, it is 10 mm or less, 8 mm or less is preferable and 6 mm or less is more preferable. More specifically, they are 0 mm or more and 10 mm or less, 1 mm or more and 8 mm or less are preferable, and 2 mm or more and 6 mm or less are more preferable.
Moreover, you may arrange | position so that the height of the convex part 43 may become high as it goes to the front part F and the rear part R from the center part C of the crotch side. By arranging the convex portions 43 in this manner, the difficulty of moving urine is expressed in stages, and thus there is an effect that local absorption can be prevented and absorption performance can be expressed more effectively.

As shown in FIG. 3, the convex portion 43 of the concave / convex region 44 continuously extends in the width direction (XG direction) from the upright base portion 41b side of the three-dimensional gather 41, and has a wavy concave / convex shape in the longitudinal direction (YG direction). It is preferable that
As another preferred embodiment, as shown in FIG. 5A, the protrusions 43 of the uneven region 44 may be intermittently arranged in the width direction (XG direction) of the three-dimensional gather 41. Each convex portion 43 is short in the longitudinal direction (YG direction) of the three-dimensional gather 41 and is long in the width direction. Further, the concave portions 42 are formed between the convex portions 43 arranged repeatedly in the longitudinal direction.
Or it is also preferable to arrange the convex portions 43 in a staggered arrangement. For example, as shown in FIG. 5B, the convex portions 43 that are intermittently arranged in the width direction (XG direction) of the three-dimensional gather 41 have a pitch with the adjacent convex portions 43 in the width direction of the three-dimensional gather 41. Even a staggered arrangement with a staggered arrangement is preferred. The shifting amount is such that the pitch in the width direction of the convex portions 43 is less than one pitch, and it is preferable to shift the pitch by, for example, ½ pitch. Although not shown, a staggered arrangement in which the pitch of the convex portions 43 is shifted in the longitudinal direction (YG direction) of the three-dimensional gather 41 may be used. The shift amount is such that the pitch in the longitudinal direction of the convex portions 43 is less than one pitch, and it is preferable to shift the pitch by, for example, ½ pitch.
In general, when a convex portion is formed, the thickness of the member itself is increased, so that rigidity is increased and deformation is difficult. Therefore, it is desirable to arrange the convex portion in a half region on the upright base portion 41b side to achieve both the suppression of urine movement and the flexibility of the three-dimensional gather 41. As a means for further improving the flexibility, the convex portion 43 can be intermittent in the XG direction, but in that case, it is preferable from the viewpoint of suppressing urine movement that the intermittent portion is not continuous in the YG direction. The staggered arrangement, particularly the staggered arrangement in which the continuity in the YG direction of the interrupted portion is reduced by shifting by 1/2 pitch is preferable.

The concavo-convex region 44 is preferably produced by bonding two layers for the shape stability of the concavo-convex shape.
For example, there is a method of producing a wavy uneven region 44 by combining expansion and contraction of an elastic member and a melt pattern.
Specifically, the portion corresponding to the concave portion 42 of the side sheet 7 forms a hot melt adhesive application portion, and is bonded to the second layer sheet 7b. In the three-dimensional gather 41 produced in this way, the contraction force of the three-dimensional gather elastic body 71 acts, so that the application portion is deformed into the concave portion 42 and the non-application portion is transformed into the convex portion 43.

Or the manufacturing method which bonds the nonwoven fabric formed in the cross-sectional wave shape and the corrugated sheet shape to another nonwoven fabric is mentioned.
Specifically, the non-woven fabric 7c and the side sheet 7 formed in a corrugated shape in a separate process are bonded together with a hot melt adhesive, but the hot melt adhesive is applied only to the convex portion on the side sheet 7 side of the corrugated non-woven fabric 7c. By applying, the concave portion 42 is formed, and the hot melt adhesive non-application portion becomes the convex portion 43.

  As shown in FIG. 6, the three-dimensional gather 41 preferably has a configuration in which two SMS nonwoven fabrics 46 and 47 having a three-layer structure in which a spunbond nonwoven fabric, a meltblown nonwoven fabric, and a spunbond nonwoven fabric are sequentially laminated. Specifically, the SMS nonwoven fabric 46 is used for the three-dimensional gather 41, and the SMS nonwoven fabric 47 is used as the uneven region 44 in the laminated structure.

Specifically, each of the two-layered SMS nonwoven fabrics 46 and 47 has an embossed surface on one surface and a flat surface on the other surface. On the embossed surface, small concave portions are formed by the embossed portions 48 and 49. The embossed portions 48 and 49 will be described later.
For example, it is preferable that the surface 46Sf of one of the two-layered SMS nonwoven fabrics 46 is a flat surface, and the back surface 46Sb is an embossed surface. The other SMS nonwoven fabric 47 is arranged with the back surface 47Sb superimposed on the front surface 46Sf of one SMS nonwoven fabric 46. The back surface 47Sb of the other SMS nonwoven fabric 47 is preferably a flat surface so that the SMS nonwoven fabrics 46 and 47 can be easily joined together. The surface 47Sf of the other SMS nonwoven fabric 47 is preferably an embossed surface.
The said flat surface means the surface of the nonwoven fabric in which the unevenness | corrugation of an embossed part is small compared with an embossed surface.
An embossed surface means the surface which has the embossed parts 48 and 49 by embossing. The embossed portions 48 and 49 referred to here are portions that are arranged on the SMS nonwoven fabric and are thinner and denser than the periphery, and the fibers are fused together, and the portions do not reach the lower layer. Is. Therefore, in other words, the embossed portions 48 and 49 are densified fusion portions that are disposed on the SMS nonwoven fabric and do not reach the opposite surface.

The other SMS nonwoven fabric 47 is provided with a concave portion 42 and a convex portion 43 of the concave-convex region 44. Therefore, the flat surface of the other SMS nonwoven fabric 47 is the back surface 47Sb on which the convex portion 43 is not disposed. Further, an internal space 43K is arranged in the convex portion 43.
The SMS nonwoven fabrics 46 and 47 are arranged in two layers so that the flat surfaces face each other, and are joined. For this joining, it is preferable to use an adhesive such as heat fusion or hot melt adhesive. In addition, in order to maintain the texture of the three-dimensional gather 41, linear bonding or dotted bonding is preferable, and dotted bonding is more preferable. Further, since the relatively smooth flat surfaces are joined to each other, the contact area is large, and the joining can be performed more reliably. Therefore, the joining strength can be easily obtained, and sufficient joining strength can be obtained even in the point joining. In addition, since the concave and convex regions 44 are overlapped, the shape of the concave and convex regions 44 is not easily broken, and the shape stability is excellent.
Further, the embossed surface is arranged on the upright base 41b (see FIGS. 1 to 3 etc.) side of the three-dimensional gather 41 on the absorbent main body 4 side, so that urine can be easily collected in the upright base 41b. This helps to prevent urine from leaking from the front F side and the rear R side.

  Moreover, as shown in FIG. 7, it is preferable that the elastic member 76 is arranged in the longitudinal direction so as to straddle the concave portion 42 and the convex portion 43 of the concave-convex region 44 in the longitudinal direction (YG direction). The elastic member 76 is preferably disposed on a surface opposite to the uneven surface of the uneven region 44. The elastic member 76 causes airy gathers, and the unevenness of the uneven region 44 is more clearly generated. The elastic member 76 can be the same as the three-dimensional gathered elastic member 71 described above. 3 (a), 3 (c) and FIG. 5 can be similarly arranged, and the unevenness of the uneven region 44 is more clearly generated.

  Examples of the side sheet 7 constituting the three-dimensional gather 41 include a highly water-repellent and water-repellent SMS nonwoven fabric such as an SMS nonwoven fabric and an SMMS nonwoven fabric. Moreover, the laminated body of nonwoven fabrics, such as a spun bond nonwoven fabric and a spun bond nonwoven fabric, and a moisture-permeable or moisture-impermeable resin film, etc. are mentioned. SMS nonwoven fabric is an abbreviation for spunbond-meltblown-spunbond laminated nonwoven fabric, and SMMS nonwoven fabric is an abbreviation for spunbond-meltblown-meltblown-spunbond nonwoven fabric.

On the ventral side F and the back side R of the diaper 10, a back flap part 17 and a ventral side flap part 18, which are laminated with the side sheet 7 and the exterior sheet 8 and project outward in the width direction, are arranged. . A fastening tape 19 is disposed on the back flap portion 17. The fastening tape 19 is preferably a hook tape, and may be an adhesive tape. Or the thing which combined the hook tape and the adhesive tape may be sufficient. The fastening tape 19 can be attached to the tape applying part 20 provided in the front part F, and a diaper can be mounted and fixed. For the tape applying part 20, for example, a breathable nonwoven fabric type is preferable in order to prevent stuffiness. Alternatively, a film type or a laminate of a fabric and a film may be used.
The diaper 10 is attached and fixed to the wearer by the fastening tape 19 and the tape applying part 20. At this time, the center of the diaper 10 in the longitudinal direction is gently bent inward, and the absorbent body 3 is worn so as to extend from the wearer's buttocks to the lower abdomen. As a result, excreta is absorbed and held in the absorber 3 accurately. In the diaper 10 of this embodiment, you may provide a functional structural member, a sheet | seat member, etc. further.

  On the other hand, the exterior sheet 8 made of a nonwoven fabric may be disposed on the non-skin contact surface side of the back sheet 2 so as to cover the entire surface. By the exterior sheet 8, the outer side of the diaper 10 has a soft texture and feels good.

  The top sheet 1 is made of a liquid-permeable member with a good touch. For example, a hydrophilic nonwoven fabric is preferable, and examples include an air-through nonwoven fabric, a point bond nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric subjected to hydrophilic treatment, and an SMS nonwoven fabric. The non-woven fabric fiber is a single fiber using polypropylene or polyethylene terephthalate as a raw material resin, a composite fiber of polypropylene and polyethylene, a composite fiber of polyethylene terephthalate and polyethylene, etc., and a fiber, rayon or acrylic, which has been subjected to a hydrophilic treatment. Hydrophilic fibers such as system fibers are preferred. Moreover, a hydrophilic perforated film or a hydrophilic nonwoven fabric may be partially overlapped on the crotch portion of the topsheet 1 on the non-skin contact surface side of the topsheet 1.

  The back sheet 2 is not particularly limited as long as it is waterproof and has moisture permeability. From the viewpoint of preventing liquid leakage on the non-skin contact surface side of the absorbent body 3, the absorbent body 3 is made of a liquid hardly permeable member. For example, a liquid-impermeable porous film can be mentioned. This porous film is formed by melting and kneading a water-repellent thermoplastic resin and a fine inorganic filler made of calcium carbonate or the like or an incompatible organic polymer, and the film is uniaxially or biaxially formed. Obtained by stretching. Examples of the thermoplastic resin include polyolefin. Examples of the polyolefin include high-density to low-density polyethylene, linear low-density polyethylene, polypropylene, polybutene, and the like, and these can be used alone or in combination. Moreover, it is preferable to have moisture permeability from a viewpoint of preventing stuffiness.

  The absorber 3 is shorter in the longitudinal direction (Y direction) and the width direction (X direction) than the top sheet 1 and the back sheet 2. The absorbent body 3 is disposed substantially in the center with its longitudinal direction coinciding with the longitudinal direction of the top sheet 1 and the back sheet 2. These topsheet 1, backsheet 2 and absorber 3 are joined together by a hot melt adhesive or the like, for example, to form an absorbent main body 4.

  As the absorbent body 3, those normally used for absorbent articles can be used as long as they have liquid absorbability and liquid retainability. For example, a fiber aggregate or a combination of this and a water-absorbing polymer can be used. Examples of fibers constituting the fiber assembly include hydrophilic natural fibers such as pulp fibers, regenerated fibers such as rayon, and synthetic fibers (preferably subjected to a hydrophilization treatment). Examples of the pulp fiber include wood pulp such as softwood kraft pulp and hardwood kraft pulp, and natural cellulose fiber such as non-wood pulp such as cotton pulp and straw pulp. Examples of the synthetic fibers include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, single fibers made of a synthetic resin such as polyvinyl alcohol resin, and composite fibers containing two or more of these resins. Semi-synthetic fibers such as acetate may be included in part. The basis weight is not particularly limited. As the water-absorbing polymer, various polymer materials usually used for this type of article can be used. The water-absorbing polymer is preferably a superabsorbent polymer compound capable of absorbing and retaining water or saline more than 20 times its own weight.

Between the absorber 3 and the back surface sheet 2, a plurality of absorber gather elastic bodies 73 may be fixed in an extended state. For example, an adhesive is used for the fixing, and examples of the adhesive include a normal hot melt adhesive. Stretchability is imparted to the absorbent body 3 by the absorbent gather elastic body 73 fixed in the stretched state, and an absorbent gather (not shown) is formed. The absorber gathers can be extended in an arbitrary longitudinal direction (Y direction) range. Moreover, the absorber gathers elastic body 73 does not necessarily need to be arrange | positioned in parallel with a longitudinal direction, as long as the contractive force can be exhibited in a longitudinal direction, and may be curving.
Moreover, since the side part of the absorber 3 expands / contracts by the absorber gather elastic body 73, the fit around the leg, particularly around the thigh root, is improved, and leakage at that portion can be prevented.

  Examples of the material for forming the three-dimensional gather elastic body 71 and the absorber gather elastic body 73 include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene. Moreover, natural rubber, ethylene vinyl acetate (EVA), stretchable polyolefin, polyurethane and the like can be mentioned. Examples of the form of the elastic body include thread-like (thread rubber etc.) whose cross section is rectangular, square, circular, elliptical or polygonal. Or a string-like thing (flat rubber etc.) or a multifilament type thread-like thing can be used preferably.

  On the other hand, a leg gather 46 may be disposed at a portion located between the side sheet 7 and the back sheet 2 on the outer side in the width direction of the side portion of the absorber 3. Leg gather elastic bodies 75 that can extend and contract around the left and right thigh roots are bonded or fixed to the leg gathers 46 in an extended state. In this way, the leg gathers 46 are formed by the leg gather elastic bodies 75 being arranged on the outer sides of the side seats 7 in the width direction. As the leg gather elastic body 75, the same kind as the three-dimensional gather elastic body 71 and the absorber gather elastic body 73 can be used.

  Due to the expansion and contraction of each of the elastic bodies 71, 73 and 75, the diaper 10 fits well following the body shape change caused by the wearer's movement, etc., and effectively prevents leakage of liquid etc. from the buttocks side and the abdomen side. obtain.

  Moreover, the coating sheet 5 (refer FIG.1 (b)) may coat | cover the skin contact surface side of the absorber 3. FIG.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, the width of the top sheet 1 may be narrower than the width of the back sheet 2, and in that case, the upright base 41 b of the three-dimensional gather 41 may be fixed to the back sheet 2.

  The absorbent article of the present invention is not limited to a deployable disposable diaper, but may be a pants-type disposable diaper or a urine collecting pad using a three-dimensional gather. Moreover, not only for adults but also for infants and the like. Furthermore, any absorbent article can be applied as long as it is an absorbent article that uses a three-dimensional gather.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples in which a laminated nonwoven fabric was produced by the above-described laminated nonwoven fabric production method. The present invention is not limited to these examples.

Example 1
As the diaper 10 of Example 1, what was shown in FIG. 1 was produced.
The test diaper 10 was produced by the following method.
As the diaper 10, Marys (registered trademark) 2015 manufactured by Kao Corporation was used. The three-dimensional gather of the diaper 10 is removed by reducing the bonding function of the hot melt adhesive by heating or cooling, and the three-dimensional gather given the uneven shape of Examples 1 to 5 below is coated with the hot melt adhesive. The part was reheated and attached.
The three-dimensional gather of Example 1 was produced as follows.
In Example 1, the three-dimensional gather shown in FIG.
First, an SMS nonwoven fabric made of polypropylene was passed between two rolls in which the convex portions of each other heated to 120 ° C. meshed with each other, and a concave and convex shape was partially imparted. The size (height) of the unevenness was appropriately adjusted by changing the clearance of the meshing part of the two rolls. A three-dimensional gather produced by bonding the uneven sheet thus obtained in place was placed in a diaper.
(Example 2)
In Example 2, the three-dimensional gather shown in FIG. The manufacturing method is the same as that of Example 1 except that the pattern shape of the convex portion 43 of the uneven region 44 is different. And the three-dimensional gather produced by the method similar to Example 1 was distribute | arranged to the diaper.
Example 3
In Example 3, the three-dimensional gather shown in FIG. The manufacturing method is the same as that of Example 1 except that the pattern shape of the convex portion 43 of the uneven region 44 is different. And the three-dimensional gather produced by the method similar to Example 1 was distribute | arranged to the diaper.
Example 4
In Example 4, the three-dimensional gather shown in FIG. The manufacturing method is the same as that of Example 1 except that the pattern shape of the convex portion 43 of the uneven region 44 is different. And the three-dimensional gather produced by the method similar to Example 1 was distribute | arranged to the diaper.
(Example 5)
In Example 5, the three-dimensional gather shown in FIG. 5B was produced. The manufacturing method is the same as that of Example 1 except that the pattern shape of the convex portion 43 of the uneven region 44 is different. And the three-dimensional gather produced by the method similar to Example 1 was distribute | arranged to the diaper.
(Example 6)
In Example 6, although not shown, a three-dimensional gather was produced in the same manner as in Example 1 except that the uneven region 44 was arranged only on the buttocks side, and arranged in a diaper.
(Comparative example)
Although the comparative example is not shown in the figure, a three-dimensional gather was produced in the same manner as in Example 1 except that the uneven area was not provided in Example 1, and was arranged in a diaper.

A diaper was attached to an infant waist model (artificial urine can be injected from the crotch and made of a transparent material), and leakage was measured by the following method. As for the installation posture, the crotch leak turned the model sideways and the back leak turned the model on its back. Artificial urine was injected through a tube at a rate of 5 g / sec at 30 g × 3 times, and visually inspected for leakage after injection.
Evaluation criteria A: No leakage.
B: Although it does not leak, artificial urine is flowing in the three-dimensional gathered middle part, the buttocks side or the abdomen side.
C: Although there is no leakage, artificial urine has come to the end of the diaper.
D: Leakage.

  As is apparent from the results shown in Table 1, at least the back and forth leakage along the solid gather can be prevented by forming at least the uneven region in the rear part of the solid gather.

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorber 4 Absorbent main body 5 Cover sheet 7 Side sheet 8 Exterior sheet 10 Tape type diaper, diaper 17 Back side flap part 18 Abdomen side flap part 19 Fastening tape 20 Tape sticking part 41 Three-dimensional gather 41b Standing up Base part 41f Free end 42 Concave part 43, 43R, 43c, 43F Convex part 44, 44R, 44c, 44F Concavity and convexity area 45 Area excluding the concavity and convexity area 44 46, 47 SMS nonwoven fabric 48, 49 Embossed part 71 Three-dimensional gather elastic body 73 Absorber Gather elastic body 75 Leg gather elastic body 76 Elastic member F Front part C Middle part R Rear part

Claims (7)

An absorbent main body having a top sheet, a back sheet, and an absorbent body sandwiched between both sheets, and a pair of three-dimensional gathers arranged to stand upright in the longitudinal direction on both sides in the width direction of the absorbent main body An absorbent article provided,
The pair of three-dimensional gathers has an uneven region in which concave portions and convex portions are repeatedly arranged in the longitudinal direction on the upright base portion side of the surface on the absorbent main body side,
The uneven area is arranged at least in the rear part of the three-dimensional gather where the wearer's buttocks side is located when the absorbent article is worn,
In the state where the three-dimensional gathers are stretched, the heights of the convex portions of the concave and convex regions arranged on the front and rear parts of the three-dimensional gathers located on the abdomen side of the wearer are the crotch part of the wearer In the case where the uneven area is arranged in the middle part of the three-dimensional gather located in the area, it is equal to or higher than the height of the convex part of the uneven area in the intermediate part, or the uneven area is not arranged in the intermediate part Then, an absorbent article higher than the intermediate part.   The absorbent article according to claim 1, wherein the uneven region is continuously arranged from the rear part to the front part through the intermediate part.   The absorptive article according to claim 1 or 2 with which said concavo-convex field is arranged only in the 1/2 field of said standing base part side in the width direction of said solid gathers.   The absorbent article according to any one of claims 1 to 3, wherein the protrusions and recesses of the uneven region extend continuously in the width direction of the three-dimensional gather and have wavy unevenness in the longitudinal direction.   The absorbent article according to any one of claims 1 to 4, wherein the uneven region is formed by stacking two SMS nonwoven fabrics having a three-layer structure in which a spunbond nonwoven fabric, a meltblown nonwoven fabric, and a spunbond nonwoven fabric are sequentially laminated. Each of the SMS nonwoven fabric of two-ply, has an embossed surface on the first surface side, wherein a flat surface on a second surface side of the surface opposite the first surface, wherein the two heavy I of SMS nonwoven fabric The absorbent article according to claim 5, wherein the opposing surfaces are the flat surfaces.   Among the two-layered SMS nonwoven fabric, the surface of one SMS nonwoven fabric is a flat surface, and the surface of the one SMS nonwoven fabric is overlaid with the back surface of the other SMS nonwoven fabric, and on the surface of the other SMS nonwoven fabric. The absorptive article according to claim 5 or 6 in which the convex part of said concavo-convex field is arranged.

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