JP7285073B2 - Composite sheet, absorbent article, and method for producing composite sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composite sheet used for absorbent articles and the like, an absorbent article having the composite sheet, and a method for manufacturing the composite sheet.

Patent Literature 1 discloses a composite sheet forming a waist belt of an absorbent article. The composite sheet of Patent Document 1 includes an inner layer sheet, an outer layer sheet laminated with the inner layer sheet, a thread-like stretchable member disposed between the inner layer sheet and the outer layer sheet, and a joint where the inner layer sheet and the outer layer sheet are joined. and have The stretchable members extend in the width direction and are arranged in plurality at intervals in the front-rear direction. A plurality of joint portions are arranged at intervals in the width direction and the front-rear direction.

JP 2015-192862 A

In the joint portion of the composite sheet of Patent Document 1, the inner layer sheet and the outer layer sheet are joined by heat welding. When the stretchable member contracts, the sheets between the adjacent joints are deformed so as to swell in the thickness direction, and folds of the sheet are formed between the adjacent joints. The pleats improve the feel of the composite sheet.

However, in recent years, there has been an increasing demand for the feel of absorbent articles. Accordingly, it is an object of the present invention to further improve the feel of a composite sheet having folds.

A composite sheet according to one aspect is a composite sheet used in an absorbent article, comprising: a stretchable member; a second sheet disposed between the first sheet and the elastic member and having a second welded portion in which fibers are welded, wherein each of the first welded portion and the second welded portion A plurality of the first welded portions are arranged at intervals in the direction of expansion and contraction of the elastic member, and the pitch of the first welded portions in the direction of expansion and contraction is different from the pitch of the second welded portions in the direction of expansion and contraction.

An absorbent article according to one aspect includes a front-rear direction and a width direction perpendicular to the front-rear direction, a front waist region, a rear waist region, and a crotch region disposed between the front waist region and the rear waist region. an absorbent body disposed across the crotch region, the front waist region, and the back waist region; a front waist belt overlapping the absorbent body in the thickness direction in the front waist region; an absorbent article comprising: a back waist belt that overlaps the absorbent main body in the thickness direction in a region; The composite sheet includes the stretchable member that stretches at least in the width direction, a first sheet that is disposed on the skin surface side of the stretchable member and has a first welded portion in which fibers are welded, a second sheet disposed between the first sheet and the elastic member and having a second welded portion in which fibers are welded, wherein each of the first welded portion and the second welded portion has the width A plurality of the first welding portions are arranged at intervals in the direction, and the pitch in the width direction of the first welding portions is different from the pitch in the width direction of the second welding portions.

A method for manufacturing a composite sheet according to one aspect includes a first sheet welding step of forming a first welded portion on a first sheet with a gap in the conveying direction, and a second sheet with a gap in the conveying direction. a second sheet welding step of forming a welded portion; and, after the first sheet welding step and the second sheet welding step, the second sheet between the elastic member stretched in the conveying direction and the first sheet. and a stacking step of arranging on a sheet, wherein the second sheet welding step forms the second welded portions at a pitch in the conveying direction different from the pitch in the conveying direction of the first welded portions.

1 is a front view of an absorbent article according to an embodiment; FIG. 1 is a plan view of an absorbent article according to an embodiment; FIG. FIG. 3 is a cross-sectional view of the absorbent article shown in FIG. 2 taken along line AA; 1 is a schematic cross-sectional view of a first composite sheet as a composite sheet; FIG. It is a cross-sectional photograph of the first composite sheet. FIG. 4 is a schematic cross-sectional view of a second composite sheet as a composite sheet; It is a cross-sectional photograph of the second composite sheet.

(1) Overview of Embodiments At least the following matters will become clear from the description of this specification and the accompanying drawings.

A composite sheet according to one aspect is a composite sheet used in an absorbent article, comprising: a stretchable member; a second sheet disposed between the first sheet and the elastic member and having a second welded portion in which fibers are welded, wherein each of the first welded portion and the second welded portion A plurality of the first welded portions are arranged at intervals in the direction of expansion and contraction of the elastic member, and the pitch of the first welded portions in the direction of expansion and contraction is different from the pitch of the second welded portions in the direction of expansion and contraction.

The first sheet is deformed by contraction of the stretchable member such that the portions between the first welded portions swell in the thickness direction. Therefore, folds are formed in the first sheet between the adjacent first welded portions. Further, the second sheet deforms so that the portions between the second welded portions swell in the thickness direction due to the contraction of the elastic member. Therefore, folds are formed in the second sheet between the adjacent second welded portions. Since the pitch of the first welded portion is different from the pitch of the second welded portion, the first welded portion and the second welded portion are arranged to be shifted in the contraction direction. Therefore, compared to a configuration in which the first welded portion and the second welded portion are all overlapped, the hardness of the welded portion of the composite sheet can be reduced, and the touch can be improved.

According to a preferred aspect, the pitch of the first weld may be longer than the pitch of the second weld.

According to this aspect, the pitch of the second welded portions is short, and the area between the second welded portions is increased. The area between the second welded parts is thinned by stretching the sheet, and has low rigidity. On the other hand, the pitch of the first welds is long, and the area between the first welds on the first sheet is small. Compared to the second sheet, the first sheet has fewer regions with low rigidity, and has a higher rigidity as a whole. A second sheet having a low overall rigidity is arranged near the stretchable member, and fine folds are likely to be formed in the second sheet. In addition, since the first sheet is farther from the elastic member than the second sheet and the pitch of the first welded parts is relatively long, the first sheet is difficult to follow fine folds of the second sheet, and the first sheet has , relatively large folds are formed so as to bulge out from the second sheet in the thickness direction. A space is formed between the first sheet and the second sheet, and the cushioning property of the composite sheet is enhanced, and the touch feeling can be improved.

According to another aspect, the pitch of the first welds may be shorter than the pitch of the second welds.

According to this aspect, since the second sheet is sandwiched between the first sheet and the elastic member, it can easily follow small folds of the first sheet. Therefore, in the second sheet, not only large folds formed by the second welded portion but also folds following small folds formed by the first welded portion are likely to be formed. As a result, the pleats of the composite sheet are likely to be uniform, and the pleats can be prevented from coming into contact with the skin locally, improving the texture. Also, since the pitch of the first welded portions is short, the area between the first welded portions increases. The area between the first welded parts is thinned by stretching the sheet, and has low rigidity. On the other hand, the pitch of the second welds is long and the area between the second welds is small. Compared to the second sheet, the first sheet has many areas with low rigidity, and the rigidity as a whole is low. The first sheet having relatively low rigidity easily conforms to the second sheet, and the folds of the composite sheet tend to be uniform.

An absorbent article according to one aspect includes a front-rear direction and a width direction perpendicular to the front-rear direction, a front waist region, a rear waist region, and a crotch region disposed between the front waist region and the rear waist region. an absorbent body disposed across the crotch region, the front waist region, and the back waist region; a front waist belt overlapping the absorbent body in the thickness direction in the front waist region; an absorbent article comprising: a back waist belt that overlaps the absorbent main body in the thickness direction in a region; The composite sheet includes the stretchable member that stretches at least in the width direction, a first sheet that is disposed on the skin surface side of the stretchable member and has a first welded portion in which fibers are welded, a second sheet disposed between the first sheet and the elastic member and having a second welded portion in which fibers are welded, wherein each of the first welded portion and the second welded portion has the width A plurality of the first welding portions are arranged at intervals in the direction, and the pitch in the width direction of the first welding portions is different from the pitch in the width direction of the second welding portions.

According to this aspect, folds are formed on the surface of the waist belt that comes into contact with the skin, and the feel around the waist can be improved. In addition, since the stretchable member stretches in the width direction, and the plurality of first welded parts and the second welded parts are arranged at intervals in the width direction, the composite sheet has pleats extending in the front-rear direction. It is formed. The folds of the waist belt can suppress the back-and-forth bulging of the waist belt. It is possible to suppress the local increase in contact with the skin due to sagging, and improve the touch. In addition, since at least two layers of the first sheet and the second sheet are arranged on the skin surface side of the elastic member, contact of the elastic member with the skin is suppressed, and traces of the elastic member and folds are suppressed. can be prevented from sticking to the skin.

According to a preferred aspect, in one of the composite sheet arranged on the front waist belt and the composite sheet arranged on the rear waist belt, the pitch of the first welded portion is the same as that of the second welded portion. The other one of the composite sheet arranged on the front waist belt and the composite sheet arranged on the rear waist belt, which is longer than the pitch, has a pitch of the first welded portion that is longer than the pitch of the second welded portion. should be short.

According to this aspect, the folds of the front waist belt and the folds of the rear waist belt are made different, and the waist belt can be applied appropriately to each of the abdomen and the back to improve the feel.

According to a preferred aspect, the composite sheet has a first composite sheet in which the pitch of the first welded portion is longer than the pitch of the second welded portion, and the first composite sheet has the front waist. It may be placed on the belt.

In general, the abdomen has softer skin than the back and is more prone to being marked by folds. However, since the first composite sheet has a high cushioning property, it is possible to soften the contact with the skin and suppress the marks caused by the folds.

According to a preferred aspect, the elastic member of the first composite sheet may be sheet-like.

According to this aspect, the first sheet and the second sheet can be shrunk in the plane by the sheet-like stretchable member. Therefore, the folds formed by the second welded portion and the folds formed by the first welded portion are easily formed, and the first sheet is easily lifted from the second sheet, and the cushioning property is likely to be improved.

According to a preferred aspect, the composite sheet has a second composite sheet in which the pitch of the first welded portion is shorter than the pitch of the second welded portion, and the second composite sheet has the rear waist. It may be placed on the belt.

The back is likely to receive body pressure in a lying posture or the like. Since the folds of the second composite sheet are likely to be uniform, the uniform folds can disperse the force when body pressure is applied, and the folds can be prevented from coming into contact with the skin locally, thereby improving the feel.

According to a preferred aspect, the elastic members of the second composite sheet may be filamentous, and may be arranged in plurality at intervals in the width direction.

According to this aspect, the first sheet and the second sheet can be shrunk at points by the thread-like elastic member. The local shrinkage of both the first sheet and the second sheet tends to make the folds of the composite sheet more uniform.

A method for manufacturing a composite sheet according to one aspect includes a first sheet welding step of forming a first welded portion on a first sheet with a gap in the conveying direction, and a second sheet with a gap in the conveying direction. a second sheet welding step of forming a welded portion; and, after the first sheet welding step and the second sheet welding step, the second sheet between the elastic member stretched in the conveying direction and the first sheet. and a stacking step of arranging on a sheet, wherein the second sheet welding step forms the second welded portions at a pitch in the conveying direction different from the pitch in the conveying direction of the first welded portions.

According to this aspect, since the first sheet, the second sheet, and the elastic member are laminated after forming the first welded portion of the first sheet and the second welded portion of the second sheet, The pitch of the first welded portions and the pitch of the second welded portions can be different. Since the pitch of the first welded portion is different from the pitch of the second welded portion, the first welded portion and the second welded portion are arranged to be shifted in the contraction direction. Therefore, it is possible to obtain a composite sheet with improved texture compared to a configuration in which the first welded portion and the second welded portion are all overlapped.

(2) Overall Schematic Configuration of Absorbent Article Hereinafter, an absorbent article according to an embodiment will be described with reference to the drawings. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic, and the ratio of each dimension is different from the actual one. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, portions having different dimensional relationships and ratios may also be included between the drawings.

The absorbent article may be tape type or pants type. The absorbent article may be a disposable diaper or a shorts-type sanitary napkin. The absorbent article of the embodiment is a pants-type disposable diaper. FIG. 1 is a schematic front view of an absorbent article 10 according to this embodiment. FIG. 2 is a schematic plan view of the disposable diaper 10 according to this embodiment. 3 is a cross-sectional view taken along line AA shown in FIG. 2. FIG. FIG. 2 and FIG. 3 show a stretched state in which the absorbent article 10 is stretched to a state in which no folds are formed with the side joints 60 to be described later unfolded. Further, in the cross-sectional view shown in FIG. 3, each member is shown separated in the thickness direction T for convenience of explanation, but they are in contact with each other in the thickness direction T in an actual product.

The absorbent article 10 has a front-rear direction L and a width direction W perpendicular to each other. The front-rear direction L is defined by the direction extending to the front side of the body and the rear side of the body. In other words, the front-rear direction L is the direction extending front-rear in the unfolded absorbent article 10 . In addition, the absorbent article 10 has both the front-rear direction L and the width direction W, which are orthogonal thickness directions.

The absorbent article 10 has a front waist region S1, a back waist region S2, and a crotch region S3. The front waist region S1 is a region facing the wearer's front waist (abdomen). The back waist region S2 is a region facing the wearer's back waist (back). The crotch region S3 is a region located in the wearer's crotch and arranged between the front waist region S1 and the back waist region S2. The crotch region S3 is a region in which leg openings 66 (see FIG. 1), which will be described later, are formed. The boundary of the front waist region S1 on the crotch region side is the front edge of the leg opening 66, and the boundary of the back waist region S2 on the crotch region side is the rear edge of the leg opening 66.

The absorbent article 10 may have an absorbent body 40 and a waist belt 15 . The waist belt 15 overlaps the absorbent main body 40 in the thickness direction. The waist belt 15 may have a front waist belt 20 and a rear waist belt 30 . The front waist belt 20 is arranged in a region overlapping the absorbent main body 40 and a region not overlapping the absorbent main body 40 in the front waist region S1. The rear waist belt 30 is separated from the front waist belt 20 in the front-rear direction L. The rear waist belt 30 is arranged in a region overlapping the absorbent main body 40 and a region not overlapping the absorbent main body 40 in the rear waist region S2. In another embodiment, the waist belt 15 may be formed by integrating the front waist belt 20 and the rear waist belt 30 and extending from the front waist region S1 to the rear waist region S2.

As shown in FIG. 3 , the front waist belt 20 includes a front cover sheet 27 arranged on the skin side T1 of the absorbent main body 40 and a front first outer covering arranged on the non-skin side T2 of the absorbent main body 40 . A sheet 25, a front second exterior sheet 26 positioned on the non-skin surface side T2 of the front first exterior sheet 25, and an exterior stretchable sheet 28 disposed between the front first exterior sheet 25 and the front second exterior sheet 26. and may have In the region that does not overlap with the absorbent main body 40, the front cover sheet 27, the first front exterior sheet 25, the stretchable exterior sheet 28, and the second front exterior sheet 26 are laminated in order from the skin side T1 toward the non-skin side T2. , are joined together. The front cover sheet 27, the first front exterior sheet 25, and the second front exterior sheet 26 may be composed of separate sheets, or may be composed of the same folded sheet.

The front cover sheet 27, the front first exterior sheet 25 and the exterior stretchable sheet 28 may constitute the first composite sheet 70A (composite sheet 70) of the present invention. The front cover sheet 27 constitutes the first sheet 71 in the first composite sheet 70A of the present invention, and the front first exterior sheet 25 constitutes the second sheet 72 in the first composite sheet 70A of the present invention. Sheet 28 may constitute elastic member 73 in first composite sheet 70A of the present invention. The composite sheet 70 will be described later in detail.

As shown in FIG. 3 , the rear waist belt 30 includes a rear cover sheet 37 arranged on the skin side T1 of the absorbent main body 40 and a rear first covering arranged on the non-skin side T2 of the absorbent main body 40 . a sheet 35, a rear second exterior sheet 36 positioned on the non-skin surface side T2 of the rear first exterior sheet 35, and a rear thread rubber disposed between the rear first exterior sheet 35 and the rear second exterior sheet 36. 38 and . In the region that does not overlap with the absorbent main body 40, the rear cover sheet 37, the first rear exterior sheet 35, the rear rubber thread 38, and the second rear exterior sheet 36 are laminated in order from the skin side T1 toward the non-skin side T2. and may be joined together. A rear third exterior sheet 39 may be arranged on the skin surface side of the rear first exterior sheet 35 . In the region where the rear third exterior sheet 39 is arranged, the rear cover sheet 37, the rear third exterior sheet 39, the rear first exterior sheet 35, the rear rubber thread 38, and the rear second exterior sheet 36 extend from the skin surface side T1. They may be laminated in order toward the non-skin surface side T2 and joined to each other. The rear cover sheet 37, the rear first exterior sheet 35, the rear second exterior sheet 36, and the rear third exterior sheet 39 may be composed of separate sheets, or may be composed of the same folded sheet. may be In the present embodiment, the rear second exterior sheet 36 and the rear third exterior sheet 39 are formed of the same sheet folded back at the waist opening 62 .

The rear first exterior sheet 35, the rear third exterior sheet 39, and the rear rubber thread 38 may constitute the second composite sheet 70B (composite sheet 70) of the present invention. The rear first exterior sheet 35 constitutes the second sheet 72 in the second composite sheet 70B of the present invention, and the rear third exterior sheet 39 constitutes the first sheet 71 in the second composite sheet 70B of the present invention, The rear rubber thread 38 may constitute the elastic member 73 in the second composite sheet 70B of the present invention.

As shown in FIG. 1, a side joint portion 60 may be provided that joins the outer portion of the front waist region S1 and the outer portion of the rear waist region S2. The side joint portion 60 is defined by a portion where the outer portion of the front waist region S1 and the outer portion of the rear waist region S2 in the width direction W are engaged with each other.

In addition, the outer portion in the present invention is a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. The inner portion in the present invention is a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is the inner edge in the width direction W. Further, the front end portion and the rear end portion in the present invention are portions occupying a certain range in the front-rear direction L including edges in the front-rear direction L, and the front end edge and the rear end edge are edges in the front-rear direction L. The outer edge includes a leading edge and a trailing edge, and the outer edge includes a leading edge and a trailing edge.

As shown in FIG. 1, in the state where the side joints 60 are formed, the absorbent article 10 has a waist opening 62 through which the wearer's waist is passed and a pair of waist openings into which the wearer's legs are respectively inserted. A leg opening 66 is formed. The waist opening 62 may be defined by a front edge S1F of the front waist region S1 and a rear edge S2R of the rear waist region S2.

Here, FIG. 2 shows a state in which the side joints 60 are unjoined and the absorbent article 10 is unfolded. The side joint portion 60 may extend along the front-rear direction L in each of the front waist belt 20 and the rear waist belt 30 . In a pants-type absorbent article, the boundary between the front waist region S1 and the crotch region S3 may be defined by the rear edges of the side joints 60 provided on the front waist belt 20 . Similarly, the boundary between the rear waist region S2 and the crotch region S3 may be defined by the front edge of the side joints 60 provided on the rear waist belt 30 .

As shown in FIG. 3, a stretchable member that can stretch in the width direction W may be arranged in the front waist region S1. The stretchable member may be composed of at least one of the front rubber thread 22 stretchable in the width direction W and the exterior stretchable sheet 28 stretchable in the width direction W. Alternatively, the elastic member may be constituted by the front waist belt 20 itself, for example constituted by an elastic sheet.

An elastic member that can expand and contract in the width direction W may be arranged in the rear waist region S2. The stretchable member may be composed of at least one of the rear rubber thread 38 stretchable in the width direction W and the exterior stretchable sheet stretchable in the width direction W. Alternatively, the elastic member may be constituted by the rear waist belt 30 itself, for example constituted by a stretchable sheet.

The absorbent main body 40 is arranged across the front waist belt 20 and the rear waist belt 30 . That is, the absorbent main body 40 extends over the front waist region S1, the back waist region S2, and the crotch region S3. The absorbent main body 40 may be configured separately from the front waist belt 20 and the rear waist belt 30 . In this case, the absorbent main body 40 may be joined to the front waist belt 20 and the rear waist belt 30 in the front waist region S1 and the rear waist region S2, respectively.

The absorbent main body 40 includes at least an absorbent core 50 . The absorbent core 50 may comprise, for example, ground pulp or superabsorbent polymers (SAP), or mixtures thereof. The absorbent core 50 is arranged at least in the crotch region S3. Preferably, the absorbent core 50 may extend in the front-rear direction L from the front waist region S1 to the rear waist region S2. The absorbent core 50 may be covered with a core wrap. Furthermore, as shown in FIG. 3, the absorbent main body 40 includes a skin sheet 42A arranged on the skin surface side of the absorbent core, a liquid impermeable sheet 41 arranged on the non-skin surface side of the absorbent core 50, and a body sheet 42</b>B arranged on the non-skin surface side T<b>2 relative to the liquid-impermeable sheet 41 .

(3) Configuration of Composite Sheet Next, the configuration of the composite sheet 70 will be described in detail with reference to FIGS. 4 to 7. FIG. Composite sheets are sheets used in absorbent articles. 4A and 4B are schematic cross-sectional views of a first composite sheet 70A as the composite sheet 70, in which FIG. 4(a) shows a stretched state, and FIG. 4(b) shows a contracted state in which the elastic members are contracted. ing. Moreover, FIG. 5 is a cross-sectional photograph of the first composite sheet 70A. 6A and 6B are schematic cross-sectional views of a second composite sheet 70B as the composite sheet 70, in which FIG. 6A shows the stretched state, and FIG. 6B shows the contracted state in which the stretchable members contract. . For convenience of explanation, in FIG. 6, the rear first exterior sheet 35 composed of the laminate 76 is shown as one layer. 4 and 6 are diagrams schematically showing the composite sheet, and the shape of the entire composite sheet such as the shape of the welded portion is not limited to those drawings. Moreover, FIG. 7 is a cross-sectional photograph of the second composite sheet 70B. 4 and 5 show only the first composite sheet 70A, and the front second exterior sheet 26 and the front rubber thread 22 among the members constituting the front waist belt 20 are omitted. 6 and 7 show only the second composite sheet 70B, and the rear second exterior sheet 36 and the rear cover sheet 37 among the members constituting the rear waist belt 30 are omitted. In the following description, the configuration in which the first composite sheet 70A is arranged on the front waist belt 20 and the second composite sheet 70B is arranged on the rear waist belt 30 will be explained. The second composite sheet 70B may be arranged on the rear waist belt 30, or the first composite sheet 70A may be arranged on the rear waist belt 30.

The composite sheet 70 includes a stretchable member 73, a first sheet 71 that overlaps the stretchable member 73 and has a first welded portion 78 in which fibers are heat-sealed, and the first sheet 71 and the stretchable member 73. a second sheet 72 having second welds 79 disposed therebetween and having fibers heat-sealed thereto. The first sheet 71 and the second sheet 72 only need to have fibers, and are made of nonwoven fabric, for example. The first sheet 71 and the second sheet 72 may be one layer or more, and may be a laminate 76 like the rear first exterior sheet 35 .

The fibers of the sheets forming the first sheet 71 are welded to the first welded portion 78 . The first welded portion 78 is a welded portion formed on the first sheet 71 and not formed on the second sheet 72 . In addition, the fibers of the sheets forming the second sheet 72 are welded to the second welded portion 79 . The second welded portion 79 is a welded portion formed on the second sheet 72 and not formed on the first sheet 71 . That is, the first welded portion 78 and the second welded portion 79 are provided separately. The first welded portion 78 and the second welded portion 79 may be formed by any one of thermal welding, ultrasonic welding, and embossing. A plurality of the first welded portions 78 and the second welded portions 79 are arranged at intervals in the stretching direction D1 of the elastic member 73 . A pitch P78 of the first welded portions 78 in the direction of expansion and contraction differs from a pitch P79 of the second welded portions 79 in the direction of expansion and contraction.

As shown in FIGS. 4(b) and 6(b), in the composite sheet 70, the contraction of the elastic member 73 causes the first sheet 71 and the second sheet 72 to contract in the contraction direction D1. At this time, the first sheet 71 is deformed so that the portions between the first welded portions 78 expand in the thickness direction T due to the contraction of the elastic member 73 . Folds are formed in the first sheet 71 between adjacent first welded portions 78 . Further, the second sheet 72 is deformed such that the portions between the second welded portions 79 swell in the thickness direction T due to the contraction of the elastic member 73 . The second sheet 72 is formed with pleats between adjacent second welded portions 79 . Since the pitch P78 of the first welded portions 78 and the pitch P79 of the second welded portions 79 are different, the first welded portions 78 and the second welded portions 79 are arranged to be shifted in the contraction direction. Therefore, compared to a configuration in which the first welded portion 78 and the second welded portion 79 are all overlapped, the hardness of the welded portion of the composite sheet 70 can be reduced, and the touch can be improved. In addition, since at least two layers of the first sheet 71 and the second sheet 72 are arranged on the skin surface side T1 of the elastic member 73, contact of the elastic member 73 with the skin is suppressed, and the elastic member 73 is You can suppress the marks of the folds and folds from sticking to the skin.

The configuration in which the pitch P78 of the first welded portions 78 in the direction of expansion and contraction differs from the pitch P79 of the second welded portions 79 in the direction of expansion and contraction may be provided over the entire composite sheet, or may be provided in part of the composite sheet. may have been That is, the concept includes all configurations except that the pitch of the first welded portions 78 and the pitch of the second welded portions are the same throughout the composite sheet 70 .

As shown in FIGS. 4 and 5 , the pitch P78 of the first welded portions 78 may be longer than the pitch P79 of the second welded portions 79 . The pitch P79 of the second welded parts 79 is short, and the area between the second welded parts 79 is increased. The area between the second welded parts 79 is thinned by stretching the sheet, and has low rigidity. On the other hand, the pitch P78 of the first welded parts 78 is long, and the area between the first welded parts 78 is small. The first sheet 71 has fewer low-rigidity regions than the second sheet 72, and has high rigidity as a whole. The second sheet 72 having low overall rigidity is arranged near the elastic member 73, and the second sheet 72 is likely to have fine folds. In addition, since the first sheet 71 is farther from the elastic member 73 than the second sheet 72 and the pitch of the first welded portions 78 is relatively long, it is difficult to follow the fine folds of the second sheet 72, and the is formed such that relatively large folds bulge from the second sheet 72 in the thickness direction. A space S is formed between the first sheet 71 and the second sheet 72, and the cushioning property of the composite sheet 70 is enhanced, so that the touch can be improved. In the present embodiment, the pitch P78 of the first welded portions 78 is longer than the pitch P79 of the second welded portions 79 in the first composite sheet 70A arranged on the front waist belt 20 .

Also, as shown in FIGS. 6 and 7, the pitch P78 of the first welded portions 78 may be shorter than the pitch P79 of the second welded portions 79 . Since the second sheet 72 is sandwiched between the first sheet 71 and the elastic member 73 , it can easily follow small folds of the first sheet 71 . In the second sheet 72 , not only large folds formed by the second welded portion 79 but also small folds formed by the first welded portion 78 are likely to be formed. As a result, the pleats of the composite sheet 70 are likely to be uniform, and the pleats can be prevented from coming into contact with the skin locally, thereby improving the texture. Also, since the pitch P78 of the first welded portions 78 is short, the area between the first welded portions 78 increases. A region between the first welded portions 78 is a portion with low rigidity. On the other hand, the pitch of the second welds is long and the area between the second welds is small. Compared to the second sheet, the first sheet has many areas with low rigidity, and the rigidity as a whole is low. The first sheet 71 having relatively low rigidity easily conforms to the second sheet 72, and the folds of the composite sheet tend to be uniform. In the present embodiment, the pitch P78 of the first welded portions 78 is shorter than the pitch P79 of the second welded portions 79 in the second composite sheet 70B arranged on the rear waist belt 30 .

(4) Configuration of Absorbent Article Having Composite Sheet Next, the configuration of the absorbent article 10 having the composite sheet 70 described above will be described. The composite sheet 70 has a cushioning property, and is preferably arranged in an area where it is particularly desired to improve the touch. The composite sheet 70 is arranged on the skin-side surface of the front waist belt 20 and the skin-side surface of the rear waist belt 30 . A front cover sheet 27 is arranged on the surface of the front waist belt 20 on the skin side, and a rear cover sheet 37 is arranged on the surface of the rear waist belt 30 on the skin side. Folds are formed on the surface of the waist belt that touches the skin, improving the feel around the waist. As a modification, the composite sheet 70 may be placed on leg flaps that are placed around the wearer's legs. According to the modified example, it is possible to improve the feel around the wearer's legs.

The stretch direction D1 of the stretchable member in the composite sheet 70 is along the width direction W, and a plurality of the first welded portions 78 and the second welded portions 79 are arranged at intervals in the width direction W. Therefore, folds extending in the front-rear direction L are formed in the composite sheet 70 . The pleats of the waist belt 15 can prevent the waist belt 15 from sagging in the front-rear direction L. It is possible to suppress the local increase in contact with the skin due to sagging, and improve the touch.

In one of the composite sheet 70 arranged on the front waist belt 20 and the composite sheet 70 arranged on the rear waist belt 30, the pitch P78 of the first welded portions 78 is longer than the pitch of the second welded portions 79. , the other composite sheet of the composite sheet arranged on the front waist belt 20 and the composite sheet arranged on the rear waist belt 30 has a pitch P78 of the first welded portions 78 shorter than a pitch P79 of the second welded portions 79. you can In the present embodiment, the composite sheet arranged on the front waist belt 20 has a pitch P78 of the first welded portions 78 longer than the pitch of the second welded portions 79, and the composite sheet arranged on the rear waist belt 30 is A pitch P78 of the first welded portions 78 is shorter than a pitch P79 of the second welded portions 79 . According to such a configuration, the folds of the front waist belt 20 and the folds of the rear waist belt 30 are made different, and the waist belt 15 can be applied appropriately to each of the abdomen and the back to improve the feel.

The first composite sheet 70</b>A is configured such that the pitch P<b>78 of the first welded portions 78 is longer than the pitch P<b>79 of the second welded portions 79 . The first composite sheet 70A may be arranged on the front waist belt 20 . In general, the abdomen has softer skin than the back and is more prone to being marked by folds. However, since the first composite sheet 70A has a high cushioning property, it is possible to soften the contact with the skin and suppress the marks caused by the folds.

The elastic member 73 of the first composite sheet 70A may be sheet-like. The stretchable member 73 of the first composite sheet 70A of the present embodiment is the exterior stretchable sheet 28 . The sheet-like elastic member 73 allows the first sheet 71 and the second sheet 72 to be contracted in their planes. Therefore, the folds formed by the second welded portion 79 and the folds formed by the first welded portion 78 are easily formed, and the first sheet 71 is easily lifted from the second sheet 72, and the cushioning property is easily improved.

Further, the second composite sheet 70B is configured such that the pitch P78 of the first welded portions 78 is shorter than the pitch P79 of the second welded portions 79 . The second composite sheet 70B may be arranged on the rear waist belt 30 . The back is likely to receive body pressure in a lying posture or the like. Since the folds of the second composite sheet are likely to be uniform, the uniform folds can disperse the force when body pressure is applied, and the folds can be prevented from coming into contact with the skin locally, thereby improving the feel.

The stretchable members 73 of the second composite sheet 70B are filamentous and may be arranged in plurality in the width direction W at intervals. The elastic members 73 of the second composite sheet 70B of the present embodiment are the rear rubber threads 38, and are arranged in plurality in the width direction W at intervals. The first and second sheets can be shrunk at points by the thread-like elastic members. The local shrinkage of both the first sheet and the second sheet tends to make the folds of the composite sheet more uniform.

(5) Manufacturing Method of Composite Sheet Next, a manufacturing method of the composite sheet configured in this manner will be described. A method for manufacturing a composite sheet includes a first sheet welding process, a second sheet welding process, and a lamination process. In the first sheet welding step, first welded portions are formed on the first sheet 71 at intervals in the conveying direction. In the first sheet welding step, the first welded portion may be formed in the first sheet continuous body in which the first sheet 71 is continuous in the conveying direction.

In the second sheet welding step, second welded portions are formed on the second sheet at intervals in the conveying direction. At this time, in the second sheet welding step, the second welded portions are formed at a pitch in the conveying direction different from the pitch in the conveying direction of the first welded portions. In the second sheet welding step, the second welded portion may be formed in the second sheet continuous body in which the second sheet 72 continues in the conveying direction.

The stacking process is performed after the first sheet welding process and the second sheet welding process. In the stacking step, the second sheet is arranged between the elastic member 73 stretched in the conveying direction and the first sheet. In the lamination step, the first sheet 71, the second sheet 72 and the elastic member 73 are joined together by an adhesive means such as an adhesive.

According to this method of manufacturing a composite sheet, after forming the first welded portion of the first sheet and the second welded portion of the second sheet, the first sheet, the second sheet and the elastic member are formed. Since they are laminated, the pitch of the first welded portions 78 and the pitch P79 of the second welded portions 79 can be made different. Since the pitch of the first welded portion is different from the pitch of the second welded portion, the first welded portion and the second welded portion are arranged to be shifted in the contraction direction. Therefore, it is possible to obtain a composite sheet with improved texture compared to a configuration in which the first welded portion and the second welded portion are all overlapped.

Although the present invention has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented with modifications and variations without departing from the spirit and scope of the invention defined by the claims. Accordingly, the descriptions herein are for the purpose of illustration and description, and are not intended to have any limiting meaning with respect to the present invention.

The texture can be further improved in the composite sheet having folds.

10: Absorbent article 20: Front waist belt 25: Front first exterior sheet (second sheet)
26: Front second exterior sheet 27: Front cover sheet (first sheet)
28: Exterior stretchable sheet (stretchable member)
30: Rear waist belt 35: Rear first exterior sheet (second sheet)
36: Rear second exterior sheet 37: Rear cover sheet 38: Rear thread rubber (elastic member)
39: Rear third exterior sheet (first sheet)
40: Absorbent main body 41: Liquid impermeable sheet 42A: Skin sheet 42B: Main body sheet 50: Absorbent core 60: Side joints 70: Composite sheet 71: First sheet 72: Second sheet 73: Elastic member D1: Stretch direction S1: front waist region S2: back waist region S3: crotch region L: front-back direction T: thickness direction T1: skin side T2: non-skin side W: width direction

Claims (11)

A front waist region, a back waist region, a crotch region disposed between the front waist region and the back waist region, and a crotch region, the front waist region, and the back waist region. and a waist belt overlapping the absorbent main body in the thickness direction in the front waist region or the back waist region, and constituting a part of the waist belt. and
an elastic member;
a first sheet disposed on the skin surface side of the stretchable member and having a first welded portion in which fibers are welded;
a second sheet disposed between the first sheet and the elastic member and having a second welded portion in which fibers are welded;
A plurality of the first welded parts and the second welded parts are arranged at intervals in the stretching direction of the elastic member,
The composite sheet, wherein the pitch of the first welded portion in the stretch direction is different from the pitch of the second welded portion in the stretch direction. 2. The composite sheet of claim 1, wherein the pitch of the first welds is longer than the pitch of the second welds. The composite sheet of claim 1, wherein the pitch of the first welds is shorter than the pitch of the second welds. a front-rear direction and a width direction orthogonal to the front-rear direction;
a front waist region;
a rear waist region;
a crotch region disposed between the front waist region and the back waist region;
an absorbent main body arranged across the crotch region, the front waist region, and the back waist region;
An absorbent article comprising a waist belt overlapping the absorbent main body in the thickness direction in at least one of the front waist region and the back waist region ,
A portion of the waist belt is composed of a composite sheet,
The composite sheet is
a stretchable member that stretches at least in the width direction;
a first sheet disposed on the skin surface side of the stretchable member and having a first welded portion in which fibers are welded;
a second sheet disposed between the first sheet and the elastic member and having a second welded portion in which fibers are welded;
A plurality of the first welded parts and the second welded parts are arranged at intervals in the width direction,
The absorbent article, wherein the pitch in the width direction of the first welded portions is different from the pitch in the width direction of the second welded portions. The waist belt has a front waist belt that overlaps the absorbent main body in the thickness direction in the front waist region, and a rear waist belt that overlaps the absorbent main body in the thickness direction in the rear waist region,
5. The absorbent article according to claim 4, wherein each of said part of said front waist belt and said part of said rear waist belt is composed of said composite sheet. One of the composite sheet arranged on the front waist belt and the composite sheet arranged on the rear waist belt has a pitch of the first welded portion longer than a pitch of the second welded portion,
In the other composite sheet of the composite sheet arranged on the front waist belt and the composite sheet arranged on the rear waist belt, the pitch of the first welded portions is shorter than the pitch of the second welded portions. The absorbent article according to claim 5 . The composite sheet has a first composite sheet in which the pitch of the first welded portion is longer than the pitch of the second welded portion,
7. The absorbent article according to claim 5 , wherein said first composite sheet is arranged on said front waist belt. 8. The absorbent article according to claim 7 , wherein said elastic member of said first composite sheet is sheet-like. The composite sheet has a second composite sheet in which the pitch of the first welded portion is shorter than the pitch of the second welded portion,
The absorbent article according to any one of claims 5 to 8 , wherein said second composite sheet is arranged on said rear waist belt. 10. The absorbent article according to claim 9 , wherein said stretchable member of said second composite sheet is filamentous, and a plurality of said stretchable members are arranged at intervals in said width direction. A front waist region, a back waist region, a crotch region disposed between the front waist region and the back waist region, and a crotch region, the front waist region, and the back waist region. and a waist belt overlapping the absorbent main body in the thickness direction in the front waist region or the back waist region, and constituting a part of the waist belt. A manufacturing method of
a first sheet welding step of forming first welded portions on the first sheet at intervals in the conveying direction;
a second sheet welding step of forming second welded portions on the second sheet at intervals in the conveying direction;
After the first sheet welding step and the second sheet welding step, the second sheet is placed between the stretchable member stretched in the conveying direction and the first sheet arranged on the skin surface side of the stretchable member. A lamination step of arranging sheets and laminating the first sheet, the second sheet and the elastic member,
In the method of manufacturing a composite sheet, the second sheet welding step forms the second welded portions at a pitch in the conveying direction different from the pitch in the conveying direction of the first welded portions.

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