JP7145756B2 - absorbent article - Google Patents

Description

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

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. 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.

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. In order to manufacture a composite sheet having such a structure, an elastic member is arranged between the inner layer sheet and the outer layer sheet, and then the joint is formed by heat welding. For example, if the joint is formed so as to overlap the stretchable member, the stretchability of the stretchable member may be hindered due to the process of forming the joint by heat welding. Therefore, the joint must be formed in a region that does not overlap with the elastic member, and the arrangement of the joint and the elastic member is restricted, and the pleat cannot be formed in the intended position and in the intended shape, resulting in the desired cushioning property. could not obtain a composite sheet having

Accordingly, it is an object of the present invention to obtain a composite sheet having high cushioning properties by improving the degree of freedom in arranging joints and stretchable members in the composite sheet.

A method for manufacturing a composite sheet according to one aspect includes a first sheet forming step of forming a first sheet continuum using a laminated continuum in which sheets that are continuous in the conveying direction are laminated, and a second sheet that is continuous in the conveying direction. a second sheet conveying step of conveying a continuous sheet; a step of applying an adhesive to at least one of a second sheet continuum and the stretchable member; and between the first sheet continuum and the second sheet continuum in an elongated state via the adhesive. and a stretchable member arranging step of adhering stretchable members, wherein the first sheet forming step forms a plurality of joints in the laminated continuous body at intervals in a plan view.

A method for manufacturing an absorbent article according to one aspect is a method for manufacturing an absorbent article having a front waist region, a crotch region, and a back waist region, wherein the composite sheet obtained by the method for manufacturing a composite sheet is used to manufacture the front waist region. A belt forming step of forming a waist belt arranged in at least one of the waist region and the rear waist region.

A composite sheet according to one aspect includes a first sheet having a laminate in which two or more sheets are laminated, a second sheet arranged to overlap with the first sheet, and the first sheet and the second sheet and a stretchable member that is disposed between and stretches in a first direction, wherein the joint portion that joins the sheets constituting the laminate does not reach the second sheet. It is provided in one sheet, and a plurality of the joint portions are provided at intervals in a plan view.

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, and a non-skin of the absorbent body in at least one of the front waist region and the back waist region and a waist belt disposed on the face side, said waist belt having a composite sheet.

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; FIG. 3 is a plan view of the composite sheet in the B portion shown in FIG. 2; FIG. 5 is a cross-sectional view of the composite sheet shown in FIG. 4 taken along line CC; It is a figure which shows the deformation|transformation aspect of a composite sheet. It is a figure for demonstrating the manufacturing method of a composite sheet. FIG. 11 is a plan view of a composite sheet according to a modified example;

(1) Overview of Embodiments At least the following matters will become clear from the description of this specification and the accompanying drawings.
A method for manufacturing a composite sheet according to one aspect includes a first sheet forming step of forming a first sheet continuum using a laminated continuum in which sheets continuous in the conveying direction are laminated, and a second sheet continuous in the conveying direction. a second sheet conveying step of conveying a continuous sheet; and an adhesive for adhering an elastic member provided between the first continuous sheet and the second continuous sheet. a step of applying an adhesive to at least one of the second sheet continuum and the stretchable member; and a stretchable member arranging step of adhering the stretchable members, wherein the first sheet forming step forms a plurality of joints in the laminated continuous body at intervals in a plan view.

The contraction of the elastic member causes the first continuous sheet and the second continuous sheet to shrink. Due to the contraction of the stretchable member, the region between the joints in the first continuous sheet is deformed so as to swell in the thickness direction, so that the pleats of the first continuous sheet can be formed between the adjacent joints. In addition, folds are formed in the second sheet by contraction of the elastic member. Therefore, the composite sheet obtained by the manufacturing method has pleats on the surface thereof, and the cushioning property is enhanced. Therefore, it is possible to obtain a composite sheet having high cushioning properties due to the joint portion and the elastic member. Moreover, since the first sheet continuous body having the joints formed thereon is bonded to the stretchable member, the stretchability of the stretchable member is not hindered due to the step of forming the joints. Therefore, restrictions on the arrangement of the joints and the elastic member are reduced, and the degree of freedom in arrangement of the joints and the elastic member can be improved. Folds can be formed in intended positions and in intended shapes, and a composite sheet having desired cushioning properties can be obtained.

According to a preferred aspect, the step of forming the first sheet forms the joints at intervals in the conveying direction, and the step of arranging the elastic members includes the elastic members stretched in the conveying direction. can be glued. By providing the joints at intervals in the conveying direction, folds can be alternately formed in the conveying direction depending on the presence or absence of the joints. In addition, since the elastic member contracts in the conveying direction, the pleats of the first continuous sheet are formed more finely.

According to a preferred aspect, in the first sheet forming step, joint portions extending in the orthogonal direction are formed in a region straddling a plurality of stretchable members arranged at intervals in an orthogonal direction orthogonal to the conveying direction. may be formed. By providing the joints across the orthogonally spaced elastic members, the pleats formed by the joints extend in the orthogonal direction. The folds can be formed by contraction of a plurality of elastic members, and the precision of the folds can be improved, and the shape of the folds can be easily maintained.

According to a preferred aspect, the first sheet forming step may form the joints by ultrasonic welding or embossing. Ultrasonic welding and embossing can form joints while transporting the laminate strip at high speed. In addition, the degree of freedom in arranging the joints is relatively high, and folds can be formed in a more intended position and in an intended shape.

According to another aspect, the first sheet forming step may apply an adhesive by coater coating to form the joint portion. The area to which the adhesive is applied by the coater application has increased rigidity due to the adhesive. By increasing the rigidity of the first sheet, it is possible to prevent the first sheet from bunching up, making it easier to form the intended folds.

According to a preferred aspect, the adhesive application step may apply the adhesive to the elastic member. Compared to the form in which the adhesive is applied to the first continuous sheet and the second continuous sheet, the adhesive is less likely to seep out to the outer surface of the composite sheet, and adhesion of the adhesive to the transport path of the composite sheet can be suppressed. . In addition, the adhesive hardly oozes out onto the surface of the composite sheet obtained by the manufacturing method, and the feel of the absorbent article having the composite sheet can be improved.

According to a preferred aspect, the stretchable member arranging step may bring the first sheet continuum and the second sheet continuum into contact in a region that does not overlap with the stretchable member in the thickness direction.

According to this aspect, a region is provided between the first continuous sheet and the second continuous sheet, in which members other than the elastic member are not arranged. Compared to a configuration in which a member other than the stretchable member is arranged, the contractile force of the stretchable member is easily transmitted to the first continuous sheet and the second continuous sheet. Therefore, folds are formed in the composite sheet by contraction of the elastic member, and a composite sheet having high cushioning properties can be obtained.

According to a preferred aspect, a laminated body forming step of forming a laminated continuous body by folding sheets continuous in the conveying direction with respect to a folding line along the conveying direction as a base point, wherein the first sheet forming step , may be performed after the laminate forming step.

By folding the sheet to form a laminated continuous body, it is possible to reduce the number of parts and man-hours for managing the parts, compared to the configuration in which separate sheets are laminated to form a laminated continuous body. In addition, the laminated continuum formed by folding the sheets has a folding line at one end in the orthogonal direction, and the stacked sheets are not misaligned in the orthogonal direction at the one end. Therefore, compared with a structure in which separate sheets are laminated to form a laminated continuous body, misalignment of the laminated sheets in the orthogonal direction can be suppressed. In addition, it is difficult for the air between the sheets constituting the laminated continuous body to escape, the gaps are easily formed between the sheets, the cushioning property of the laminated continuous body is improved, and the cushioning property of the composite sheet obtained by the manufacturing method is further improved. can improve.

According to a preferred aspect, the laminated body forming step may form the laminated continuous body such that the folded sheets can be separated from each other. A gap is easily formed between the sheets constituting the continuous laminated body, the cushioning property of the continuous laminated body is improved, and the cushioning property of the composite sheet obtained by the manufacturing method can be further improved.

According to another aspect, in the laminate forming step, the lamination is performed through an adhesive having a basis weight lower than that of an adhesive provided between the first continuous sheet and the second continuous sheet. Sheets forming a continuum may be joined together. Since the basis weight of the adhesive provided between the first sheet continuum and the second sheet continuum is high, the bonding strength of the elastic member to the first sheet continuum and the second sheet continuum is high, and the elastic member contraction is easily transmitted to the first continuous sheet and the second continuous sheet. In addition, since the basis weight of the adhesive in the continuous laminated body is low, the sheets constituting the continuous laminated body are easily deformed flexibly, and folds are easily formed in the continuous laminated body. Therefore, the cushioning property of the laminated continuum is improved, and the cushioning property of the composite sheet obtained by the manufacturing method can be improved. Also, the material cost of the adhesive can be reduced, and the manufacturing process can be simplified.

According to a preferred aspect, the stretchable member arranging step may arrange the thread-like or band-like stretchable members at intervals in an orthogonal direction orthogonal to the conveying direction. The stretchability of the stretchable member is not hindered due to the process of forming the joints, and the degree of freedom in arranging the stretchable member 73 can be increased. By improving the degree of freedom in arranging the stretchable members, folds can be formed in intended positions and in intended shapes, and a composite sheet having desired cushioning properties can be obtained.

A method for manufacturing an absorbent article according to one aspect is a method for manufacturing an absorbent article having a front waist region, a crotch region, and a back waist region, wherein the composite sheet obtained by the above-described composite sheet manufacturing method is used. and a belt forming step of forming a waist belt arranged in at least one of the front waist region and the rear waist region. By providing a waist belt having a composite sheet with high cushioning properties, the feel around the waist can be improved.

According to a preferred aspect, the belt forming step may form the waist belt by arranging the first sheet continuous body side of the composite sheet on the skin surface side of the absorbent article. Since the pleats are formed more easily on the side of the first sheet continuous body, the cushioning property on the side that comes into contact with the skin can be improved, and the wearer's touch can be improved.

According to a preferred aspect, the belt forming step may form the waist belt by arranging the second sheet continuous body side of the composite sheet on the skin surface side of the absorbent article. Since it is easier to form folds on the side of the first sheet continuous body, it is possible to improve the feel when the absorbent article is touched from the outside.

According to a preferred aspect, an absorbent core having an absorbent material, a skin-side sheet arranged on the skin side of the absorbent core, and a non-skin-side sheet arranged on the non-skin side of the absorbent core. and a belt joining step of joining the absorbent main body obtained by the absorbent main body forming step and the waist belt obtained by the belt forming step. and may have

According to this aspect, by manufacturing the waist belt and the absorbent body separately, they can be stably manufactured according to their intended specifications. By providing a waist belt having a composite sheet with high cushioning properties, an absorbent article with excellent texture can be obtained.

A composite sheet according to one aspect includes a first sheet having a laminate in which two or more sheets are laminated, a second sheet arranged to overlap with the first sheet, and the first sheet and the second sheet A composite sheet having a stretchable member that is joined to the first sheet and the second sheet between and stretchable in a first direction, wherein the joint portion for joining the sheets constituting the laminate is It is provided in the first sheet so as not to reach the second sheet, and a plurality of the joint portions are provided at intervals in plan view.

In the composite sheet, the contraction of the elastic member causes the first sheet and the second sheet to contract in the first direction. Due to the contraction of the stretchable member, the region between the joints in the first sheet deforms so as to swell in the thickness direction, so that folds made of the first sheet can be formed between the adjacent joints. In addition, the contraction of the elastic member also causes the second sheet to contract, forming folds in the second sheet. Therefore, the composite sheet has pleats formed on its surface, and the cushioning property is improved. In addition, since the joint portion of the first sheet is not formed in the second sheet, the stretchability of the elastic member is not hindered due to the step of forming the joint portion. Therefore, restrictions on the arrangement of the joints and the elastic member are reduced, and the degree of freedom in arrangement of the joints and the elastic member can be improved. Folds can be formed in intended positions and in intended shapes, and a composite sheet having desired cushioning properties can be obtained.
In addition, since the joining portion of the first sheet is not formed in the second sheet, the folds formed in the first sheet and the folds formed in the second sheet are formed at different positions and in different manners. As compared with the structure in which the folds formed in the first sheet and the folds formed in the second sheet are integrated, the cushioning property is enhanced.

According to a preferred aspect, a plurality of the elastic members are provided at intervals in a second direction orthogonal to the first direction, and the joint portion straddles the plurality of elastic members. may be placed. By providing the joint part across a plurality of elastic members, the folds can be formed by contraction of the plurality of elastic members, and the precision of the folds can be improved and the shape of the folds can be easily maintained.

According to a preferred aspect, it may have a contact area where the first sheet and the second sheet contact. A region is provided between the first sheet and the second sheet in which members other than the elastic member are not arranged. Compared to a configuration in which members other than elastic members are arranged, the contractile force of the elastic members is easily transmitted to the first sheet and the second sheet. Therefore, folds are formed in the composite sheet by contraction of the elastic member, and a composite sheet having high cushioning properties can be obtained.

According to a preferred aspect, the edges of the laminate may be provided with creases formed by folding the sheets forming the laminate. By constructing the laminate with folded sheets, the number of parts can be reduced compared to a laminate in which separate sheets are laminated. In addition, the stacked sheets are not misaligned at the edges of the stacked body where the folds are provided. Positional displacement of the sheets constituting the laminate is suppressed, and the accuracy of the absorbent article can be improved. In addition, it is difficult for the air between the sheets constituting the laminate to escape. A gap is easily formed between the sheets, the cushioning property of the laminate is improved, and the cushioning property of the composite sheet can be further improved.

According to a preferred aspect, the sheets constituting the laminate are bonded together via an adhesive, and the stretchable member is disposed between the first sheet and the second sheet via the adhesive. The basis weight of the adhesive that joins the laminate may be lower than the basis weight of the adhesive that joins the first sheet and the second sheet. Since the basis weight of the adhesive provided between the first sheet and the second sheet is high, the bonding strength of the elastic member to the first sheet and the second sheet is high, and the shrinkage of the elastic member is reduced by the first sheet and the second sheet. It becomes easy to be transmitted to 2 seats. In addition, since the basis weight of the adhesive in the laminate is low, the sheets forming the laminate are easily deformed flexibly, and folds are easily formed in the laminate. Therefore, the cushioning property of the laminate is improved, and the cushioning property of the composite sheet obtained by the manufacturing method can be improved.

According to a preferred aspect, a plurality of the elastic members are provided at intervals in a second direction orthogonal to the first direction, and a plurality of the joint portions are provided at intervals in the second direction. and the pitch of the joints in the second direction may be shorter than the pitch of the elastic members in the second direction. Since a plurality of joint portions are arranged at intervals in the second direction, folds extending in the second direction can be formed. Also, since the pitch of the joints is short, finer folds can be formed in an intended manner.

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. and an absorbent body disposed across the crotch region, the front waist region, and the back waist region, and the absorbent body and the thickness direction in at least one of the front waist region and the back waist region and a waistbelt overlying the waistbelt, wherein the waistbelt may comprise a composite sheet as described above. By providing a waist belt having a composite sheet with high cushioning properties, the feel around the waist can be improved.

According to a preferred aspect, the first sheet of the composite sheet may be positioned closer to the skin than the second sheet. Since the folds can be formed more easily in the first sheet, the cushioning property of the side that comes into contact with the skin can be improved, and the wearer's touch can be improved.

According to a preferred aspect, the first sheet and the second sheet are composed of a nonwoven fabric or a woven fabric having fibers, and the basis weight of the fibers of the first sheet is the basis weight of the fibers of the second sheet. It can be higher than the quantity. Since the basis weight of the first sheet is high, folds formed in the first sheet are less likely to be crushed, and the wrinkles are easily maintained. Therefore, the cushioning property of the first seat can be further improved, and the touch can be improved.

According to a preferred aspect, the outer edge of the first sheet in the front-rear direction is provided along the width direction with a first crease formed by folding the sheets forming the laminate. The fold line may be arranged outside in the front-rear direction of the outer edge of the absorbent main body in the front-rear direction. In the region of the first sheet in the vicinity of the first fold, gaps are likely to be formed between the sheets folded down through the first fold, and the thickness of the first sheet tends to increase. In the area outside the outer edge of the absorbent main body in the front-rear direction, a difference in thickness is more likely to occur than in the area where the absorbent main body is arranged. It can be padded by the thickness of the neighboring regions. Therefore, the thickness difference in the waist belt is reduced, and the touch can be improved.

According to a preferred aspect, a second crease formed by folding the second sheet is provided along the width direction at the outer edge of the second sheet in the front-rear direction, and the second crease is: The first fold of the first sheet is arranged outside the outer edge of the absorbent body in the front-rear direction in the front-rear direction, and the first fold of the first sheet is placed between the second sheets folded via the second fold. may be placed.

In the area outside the outer edge of the absorbent main body in the front-rear direction, a difference in thickness is more likely to occur than in the area where the absorbent main body is arranged. It can be further padded by the thickness of the neighboring regions. In addition, since the first fold of the first sheet is arranged between the second sheets folded via the second fold, the second fold overlaps the bulge of the sheet in the vicinity of the first fold. A nearby bulge can be provided. The thickness difference in the waist belt is further reduced, and the texture can be improved.

(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. FIGS. 2 and 3 show a stretched state in which the absorbent article 10 is stretched to a state where wrinkles are not 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 first front exterior sheet 25, the second front exterior sheet 26, and the stretchable exterior sheet 28 may constitute the composite sheet 70 of the present invention. The front cover sheet 27 and the front first exterior sheet 25 constitute the first sheet 71 of the present invention, the front second exterior sheet 26 constitutes the second sheet 72 of the present invention, and the exterior stretchable sheet 28 constitutes the present invention. The elastic member 73 of the invention may be constructed. 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 second exterior sheet 36, and the rear rubber thread 38 may constitute the composite sheet 70 of the present invention. The rear first exterior sheet 35 constitutes the first sheet 71 of the present invention, the front second exterior sheet 26 constitutes the second sheet 72 of the present invention, and the rear rubber thread 38 constitutes the stretchable sheet of the present invention. Member 73 may be configured.

As shown in FIG. 1 , side joints 60 may be provided that join an end of the front waist region S1 in the width direction W and an end of the rear waist region S2 in the width direction W. The side joint portion 60 is defined by a portion where an end portion of the front waist region S1 in the width direction W and an end 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 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 polymer (SAP), or mixtures thereof. The absorbent core 50 is arranged at least in the crotch region S3. Preferably, the absorbent core 50 may extend from the front waist region S1 to the rear waist region S2 in the front-rear direction L. 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 surface 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 .

In the absorbent main body 40 of the present embodiment, in the region on the front side of the absorbent core, the skin surface sheet 42A, the liquid impermeable sheet 41, and the main body sheet 42B are arranged in order from the skin surface side T1 toward the non-skin surface side T2. are placed in In the region overlapping the absorbent core 50, the skin sheet 42A, the absorbent core 50, the liquid impermeable sheet 41, and the body sheet 42B are arranged in this order from the skin side T1 toward the non-skin side T2. . The skin sheet 42A and the liquid-impermeable sheet 41 may be arranged with the absorbent core 50 sandwiched in the thickness direction T. The liquid-impermeable sheet 41 may be liquid-impermeable, and may be made of a film, for example. The skin sheet 42A and the main body sheet 42B may be liquid-permeable, and may be made of, for example, nonwoven fabric.

(3) Configuration of Composite Sheet Next, the configuration of the composite sheet 70 will be described in detail with reference to FIGS. 3 to 5. FIG. 4 is a plan view of the composite sheet at portion B shown in FIG. 2, and FIG. 5 is a cross-sectional view taken along line CC shown in FIG. Figures 4 and 5 show the composite sheet in a stretched state. FIGS. 4 and 5 show the composite sheet in the B portion, and the rear cover sheet 37 and the rear third exterior sheet 39 among the members constituting the rear waist belt 30 are omitted. In addition, in the following description, the composite sheet in the rear waist belt will be described. However, as noted above, the front waistbelt 20 may also have a composite sheet, and the composite sheet configuration in the rear waistbelt is also applicable to the composite sheet in the front waistbelt 20 .

The composite sheet 70 includes a first sheet 71 having a laminated body 76 in which two or more sheets are laminated, a second sheet 72 arranged to overlap the first sheet 71, and the first sheet 71 and the second sheet 72. and a stretchable member 73 disposed between and stretchable in the first direction D1. As described above, the rear first exterior sheet 35 constitutes the first sheet 71, the rear second exterior sheet 36 constitutes the second sheet 72, and the rear rubber thread 38 constitutes the elastic member 73. is doing.

The rear first exterior sheet 35 as the first sheet 71 has a laminate 76 in which two or more sheets are laminated. A sheet forming the first sheet 71 is not limited, but non-woven fabric can be exemplified, for example. The rear first exterior sheet 35 may be composed only of the laminate 76, or may include other sheets. The laminated body 76 may be formed by stacking the same or different sheets, and may have three or more layers. The first sheet 71 may be provided with a joining portion 75 for joining the sheets forming the laminate 76 . The joint portion 75 may be provided so as not to reach the second sheet 72 , and may be provided over the entire thickness direction T of the first sheet 71 . may be provided in the department. Specifically, a welded portion in which the sheets constituting the first sheet 71 are welded together by heat or ultrasonic waves, an embossed portion in which the sheets are compressed in the thickness direction, and a bonded portion in which the sheets are bonded together with an adhesive can be exemplified. A plurality of joint portions 75 are provided at intervals in plan view. That is, the joint portions 75 are spaced apart in at least one of the front-rear direction L and the width direction.

The rear rubber thread 38 as a stretchable member is configured to be stretchable in the width direction W as the first direction. The rear rubber thread 38 is stretched in the width direction and placed between the rear first exterior sheet 35 (the first sheet 71) and the rear second exterior sheet 36 (the second sheet 72). 35 and the rear second exterior sheet 36 are joined. The means for fixing the rear rubber thread 38 is not limited, but for example, an adhesive can be used. Further, the stretchable member 73 may be made of thread rubber, or may be sheet-like like the exterior stretchable sheet 28 . The rear rubber thread 38 of the embodiment is composed of a plurality of rubber threads, which are arranged at intervals in a second direction D2 (front-rear direction L) orthogonal to the first direction D1.

A rear second exterior sheet 36 as the second sheet 72 covers the elastic member 73 . The first sheet 71 is arranged on one side of the elastic member 73 in the thickness direction T, and the second sheet 72 is arranged on the other side. The sheet forming the second sheet 72 is not limited, but non-woven fabric can be exemplified, for example. The second sheet 72 does not have the joint portion 75 formed in the first sheet 71, and is joined to the first sheet 71 and/or the elastic member 73 by a joining means other than the joint portion 75. .

A deformation mode of the composite sheet 70 configured in this manner during contraction will be described. FIG. 6 is a diagram for explaining a modified mode of the composite sheet 70, and is based on a cross section taken along line DD in FIG. FIG. 6(a) shows the stretched state, and FIG. 6(b) shows the contracted state in which the elastic member is contracted. In the composite sheet 70, the first sheet 71 and the second sheet 72 contract in the first direction D1 due to contraction of the elastic member 73. As shown in FIG. Due to the contraction of the stretchable member 73 , the region between the joints 75 in the first sheet 71 is deformed so as to swell in the thickness direction T, and folds of the first sheet 71 can be formed between the adjacent joints 75 . In addition, the contraction of the elastic member causes the second sheet 72 to contract, forming folds in the second sheet 72 . Therefore, the composite sheet 70 has pleats on its surface, and the cushioning property is improved. In addition, since the joint portion of the first sheet 71 is not formed in the second sheet, the folds formed in the first sheet 71 and the folds formed in the second sheet are formed at different positions and in different manners. be. Compared to the configuration in which the folds formed in the first sheet 71 and the folds formed in the second sheet are integrated, the cushioning property is further improved.

Composite sheet 70 may have an abutment region 77 where first sheet 71 and second sheet 72 abut. The contact area 77 is an area that does not overlap with the elastic member 73 and is an area where no other member is arranged between the first sheet 71 and the second sheet 72 . In FIG. 5 the abutment area 77 is shown. Since no sheet or the like other than the stretchable member 73 is arranged between the first sheet 71 and the second sheet 72, the contractile force of the stretchable member 73 is lower than that in the case where a member other than the stretchable member is arranged. can be easily transmitted, and the cushioning property of the composite sheet 70 can be further enhanced.

The edge of the laminate 76 may be provided with a fold line FL76 obtained by folding the sheets forming the laminate 76 . By configuring the laminate 76 with folded sheets, the number of parts can be reduced compared to the laminate 76 in which separate sheets are laminated. In addition, at the edge of the stack 76 where the folding line FL76 is provided, the stacked sheets are not misaligned. Positional displacement of the sheets constituting the laminate 76 is suppressed, and the accuracy of the absorbent article 10 can be improved. In addition, it is difficult for the air between the sheets forming the laminate 76 to escape. A gap is easily formed between the sheets, the cushioning property of the laminate 76 is improved, and the cushioning property of the composite sheet 70 can be further improved.

The method of joining the sheets forming the laminate 76 is not limited, and examples thereof include welding by heat or ultrasonic waves, embossing, and adhesives. The bonding between the sheets constituting the laminate and the bonding between the first sheet 71 and the second sheet 72 may be performed with an adhesive. In this embodiment, the basis weight of the adhesive that joins the laminate may be lower than the basis weight of the adhesive that joins the first sheet 71 and the second sheet 72 . Since the basis weight of the adhesive provided between the first sheet 71 and the second sheet 72 is high, the bonding strength of the elastic member 73 to the first sheet 71 and the second sheet 72 is high, and the elastic member 73 shrinks. is easily transmitted to the first sheet 71 and the second sheet 72 . Further, since the basis weight of the adhesive in the laminate 76 is low, the sheets forming the laminate 76 are easily deformed flexibly, and folds are easily formed in the laminate 76 . Therefore, the cushioning property of the laminate 76 is improved, and the cushioning property of the composite sheet 70 obtained by the manufacturing method can be improved.

As shown in FIG. 5, a plurality of elastic members 73 are provided at intervals in a second direction D2 orthogonal to the first direction D1, which is the stretching direction, and the joint portions 75 are provided at intervals in the second direction D2. may be provided more than once. In this form, the pitch P275 of the joints 75 in the second direction D2 may be shorter than the pitch P273 of the elastic members 73 in the second direction D2. Since a plurality of joint portions 75 are arranged at intervals in the second direction D2, folds extending in the second direction D2 can be formed. Further, since the pitch of the joints 75 is short, finer folds can be formed.

(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. In this embodiment, a composite sheet 70 is arranged on the front waist belt 20 and the rear waist belt 30 . By providing the waist belt 15 having the composite sheet 70 with high cushioning properties, the feel around the waist can be improved. Alternatively, the composite sheet 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 first sheet 71 of the composite sheet may be positioned closer to the skin surface side T1 than the second sheet 72 is. It is possible to improve the cushioning properties of the side that comes in contact with the skin, and to improve the wearer's touch. More preferably, the first sheet 71 of the composite sheet 70 may be provided on the surface of the absorbent article 10 closest to the skin, that is, the surface that comes into direct contact with the wearer. According to such a configuration, it is possible to improve the feel on the wearer's skin. In the present embodiment, the front cover sheet 27 that constitutes the first sheet 71 in the front waist belt 20 is provided on the surface that comes into direct contact with the wearer.

The first sheet 71 and the second sheet 72 are made of nonwoven fabric or woven fabric having fibers, and the basis weight of the fibers of the first sheet 71 may be higher than the basis weight of the fibers of the second sheet 72 . Since the basis weight of the first sheet 71 is high, the folds formed in the first sheet 71 are less likely to collapse, and the wrinkles are easily maintained. Therefore, the cushioning property of the first seat 71 is further improved, and the touch can be improved. Also, in a modification, the basis weight of the fibers of the first sheet 71 may be lower than the basis weight of the fibers of the second sheet 72 . Since the basis weight of the first sheet is relatively low, the first sheet is easily deformed and creases are easily formed in the first sheet. Therefore, the cushioning property of the first seat 71 is further improved, and the touch can be improved.

A first fold line FL71 where the sheet is folded may be provided along the width direction at the outer edge of the first sheet 71 in the front-rear direction L. As shown in FIG. The first fold line FL71 may be arranged outside in the front-rear direction of the outer edge of the absorbent main body in the front-rear direction. Specifically, the rear first exterior sheet 35 is provided with a fold line FL76 formed by folding the sheets forming the laminate. The fold FL76 constitutes the first fold FL71. The first fold FL71 is positioned at the trailing edge 71R of the first sheet 71 and extends along the width direction W. As shown in FIG. The first fold line FL71 is separated from the rear edge 40R of the absorbent main body 40 and positioned rearward of the rear edge 40R of the absorbent main body 40 . In the region of the first sheet 71 near the first fold line FL71, a gap is likely to be formed between the sheets folded down via the first fold line FL71, and the thickness of the first sheet 71 is likely to be increased. A region outside the outer edge of the absorbent main body 40 in the front-rear direction is more likely to have a difference in thickness than the region where the absorbent main body is arranged. It can be filled by the thickness of the area near the crease. Therefore, the thickness difference in the waist belt is reduced, and the touch can be improved.

A second fold line FL72 where the second sheet 72 is folded may be provided along the width direction at the outer edge of the second sheet 72 in the front-rear direction. The second fold line FL72 may be arranged outside the front-rear direction L outer edge of the absorbent main body 40 in the front-rear direction. The outer side in the front-rear direction of the outer edge of the absorbent main body 40 in the front-rear direction L means the area between the rear edge 40R of the absorbent main body 40 and the rear edge 10R of the absorbent article, It is the area between the front edge 40F and the front edge 10F of the absorbent article.

In the present embodiment, the rear second exterior sheet 36 is folded in the front-rear direction at the fold line FL36. The folded portion constitutes the rear third exterior sheet 39 . A fold line FL36 of the rear second exterior sheet 36 constitutes a second fold line FL72. The second fold line FL72 is positioned at the trailing edge of the second sheet 72 and extends along the width direction W. As shown in FIG. The second fold line FL72 is spaced apart from the rear edge 40R of the absorbent main body 40 and positioned rearward of the rear edge 40R of the absorbent main body 40 . A trailing edge 72</b>R of the second sheet 72 constitutes the trailing edge of the composite sheet 70 and may be positioned at the trailing edge of the rear waist belt 30 . In the area outside the outer edge of the absorbent main body 40 in the front-rear direction L, a difference in thickness is more likely to occur than in the area where the absorbent main body 40 is arranged. Additional padding can be provided by the thickness of the region near the second fold.

Preferably, the first fold of the first sheet 71 may be arranged between the second sheets 72 folded via the second fold FL72. Specifically, a first fold line FL71 is arranged between the rear second exterior sheet 36 and the rear third exterior sheet 39 . Since the first fold line of the first sheet 71 is arranged between the second sheets 72 folded via the second fold line FL72, the second fold line FL72 overlaps the bulge of the sheet near the first fold line FL71. A bulge in the vicinity of the can be provided. The thickness difference in the waist belt is further reduced, and the texture can be improved.

(5) Method for Manufacturing Composite Sheet Next, a method for manufacturing the composite sheet configured in this way will be described with reference to FIG. The composite sheet manufacturing method S100 may include a first sheet forming step S11, a second sheet conveying step S21, an adhesive applying step S31, and an elastic member placing step S41. In the first sheet forming step S11, a first sheet continuous body C71 is formed using a laminated continuous body C76 in which sheets continuous in the transport direction MD are stacked. The laminated continuum C76 is formed by laminating two or more layers of sheets, which are continuous in the transport direction MD.

In the first sheet forming step S11, a plurality of joints 75 are formed in the laminated continuous body C76 at intervals in plan view. The joint portions 75 may be spaced apart in a plan view, may be spaced apart in the transport direction MD, or may be spaced apart in the orthogonal direction CD orthogonal to the transport direction MD. They may be arranged, or they may be arranged at intervals in the transport direction MD and the orthogonal direction CD.

The second sheet conveying step S21 conveys a second continuous sheet C72 that continues in the conveying direction MD. The adhesive application step S31 applies an adhesive for adhering the elastic member 73 provided between the first continuous sheet C71 and the second continuous sheet C72 to the first continuous sheet C71 and the second continuous sheet C72. It is applied to at least one of C72 and elastic members. The order of the first sheet forming step S11, the second sheet conveying step S21, and the adhesive applying step S31 is not limited as long as the adhesive applying step S31 is performed after the first sheet forming step S11.

The elastic member arranging step S41 is performed after the first sheet forming step S11, the second sheet conveying step S21, and the adhesive application step S31. The elastic member 73 in a stretched state is adhered via an adhesive. The direction of expansion and contraction of the elastic member 73 is not limited, but preferably along the transport direction MD. Since the stretching direction of the elastic member 73 is along the conveying direction MD of the first continuous sheet C71 and the second continuous sheet C72, the manufacturing process and equipment can be simplified.

According to such a composite sheet manufacturing method, the elastic member in a stretched state is adhered between the first sheet continuous body C71 and the second sheet continuous body C72, and the first sheet continuous body is formed by contraction of the stretchable member. The body C71 and the second sheet continuous body C72 contract. Due to the contraction of the stretchable member, the region between the joints in the first sheet deforms so as to swell in the thickness direction, so that folds made of the first sheet can be formed between the adjacent joints. In addition, folds are formed in the second sheet by contraction of the elastic member. Therefore, the composite sheet obtained by the manufacturing method has pleats on the surface thereof, and the cushioning property is enhanced. In addition, since the first sheet continuous body C71 in which the joints 75 are formed and the stretchable member 73 are adhered, the stretchability of the stretchable member is not hindered due to the process of forming the joints 75 . Therefore, restrictions on the arrangement of the joints and the elastic member are reduced, and the degree of freedom in arrangement of the joints and the elastic member can be improved. Folds can be formed in intended positions and in intended shapes, and a composite sheet having desired cushioning properties can be obtained.

Also, the first sheet forming step S11 may form the joint portions 75 with a gap in the transport direction MD, and the stretchable member placement step S41 may bond the stretchable members 73 stretched in the transport direction MD. By arranging the joint portions 75 of the first sheet continuous body C71 at intervals in the conveying direction MD, folds can be alternately formed in the conveying direction MD depending on the presence or absence of the joint portions 75 . In addition, since the elastic member 73 contracts in the conveying direction MD, the pleats of the first sheet continuous body C71 can be formed more finely.

In the modified example, in the first sheet forming step S11, joint portions 75 extending in the orthogonal direction CD are formed in a region straddling a plurality of elastic members 73 arranged at intervals in the orthogonal direction CD orthogonal to the transport direction MD. may be formed. FIG. 8 is a plan view of a composite sheet 70X manufactured by a manufacturing method according to a modification. The joint portion 75X according to the modification is provided across stretchable members that are arranged at intervals in the orthogonal direction. Therefore, folds extending in the orthogonal direction can be formed by contraction of a plurality of stretchable members, and the precision of the folds can be improved and the shape of the folds can be easily maintained.

The joining means of the joining portion 75 in the first sheet forming step S11 is not particularly limited. In one embodiment, the joint may be formed by ultrasonic welding or embossing. Ultrasonic welding and embossing can form the joints 75 while conveying the laminated continuous body C76 at high speed. In addition, the degree of freedom in arranging the joints 75 is high, and the degree of freedom in design and the accuracy of the position of the folds can be improved.

As another form, the first sheet forming step S11 may apply an adhesive by a coater to form the joint portion. Coater coating is a contact coating and allows the adhesive to be placed on the surface compared to non-contact coating methods. The area to which the adhesive is applied by the coater application has increased rigidity due to the adhesive. By increasing the rigidity of the first sheet, it is possible to prevent the first sheet from bunching up, making it easier to form the intended folds.

The adhesive applying step S31 may apply an adhesive to the elastic member 73 . Compared to the mode in which the adhesive is applied to the first continuous sheet C71 and the second continuous sheet C72, the adhesive is less likely to seep out to the outer surface of the composite sheet 70, and the adhesive adheres to the transport path of the composite sheet 70. can be suppressed. In addition, the adhesive hardly oozes out onto the surface of the composite sheet 70 obtained by the manufacturing method, and the feel of the absorbent article 10 having the composite sheet 70 can be improved.

In the stretchable member arranging step S41, the first sheet continuous body C71 and the second sheet continuous body C72 may be brought into contact with each other in a region that does not overlap the stretchable member 73 in the thickness direction T. That is, no sheet or the like other than the elastic member 73 is arranged between the first continuous sheet C71 and the second continuous sheet C72. Compared to a configuration in which a member other than the stretchable member is arranged, the contractile force of the stretchable member 73 can be easily transmitted, and the cushioning properties of the composite sheet 70 can be further enhanced.

The composite sheet manufacturing method may have a laminate forming step S51 before the first sheet forming step S11. In the laminated body forming step S51, the continuous laminated body C76 is formed by folding the sheet continuous in the transport direction MD about the folding line along the transport direction MD. By folding the sheets to form the laminated continuous body C76, it is possible to reduce the number of parts and man-hours for managing the parts, compared to the configuration in which separate sheets are laminated to form the laminated continuous body. In addition, the laminated continuum formed by folding the sheets has a folding line at one end in the orthogonal direction, and the stacked sheets are not misaligned in the orthogonal direction at the one end. Therefore, compared with a structure in which separate sheets are laminated to form a laminated continuous body, misalignment of the laminated sheets in the orthogonal direction can be suppressed. In addition, it is difficult for the air between the sheets constituting the laminated continuous body to escape, the gaps are easily formed between the sheets, the cushioning property of the laminated continuous body is improved, and the cushioning property of the composite sheet obtained by the manufacturing method is further improved. can improve.

In the laminated body forming step S51, the laminated continuous body C76 may be formed so that the folded sheets can be separated from each other. Specifically, the laminated continuous body C76 may be formed without providing an adhesive between the folded sheets. A gap is easily formed between the sheets constituting the continuous laminated body C76, the cushioning property of the continuous laminated body C76 is improved, and the cushioning property of the composite sheet obtained by the manufacturing method can be further improved. Note that the area where the folded sheets can be separated from each other may be part of the laminated continuous body. However, in order to improve the cushioning property of the entire surface of the continuous laminate, it is preferable not to apply the adhesive over the entire surface of the continuous laminate. The material cost of the adhesive can be reduced, and the process of applying the adhesive becomes unnecessary, thereby simplifying the manufacturing process.

Moreover, in a modification, the laminated body forming step S51 may bond the folded sheets with an adhesive. In the modified example, the sheets constituting the laminated continuous body are joined via an adhesive having a basis weight lower than that of the adhesive provided between the first continuous sheet C71 and the second continuous sheet C72. you can A gap is easily formed between the sheets constituting the continuous laminated body C76, the cushioning property of the continuous laminated body C76 is improved, and the cushioning property of the composite sheet obtained by the manufacturing method can be further improved. Also, the material cost of the adhesive can be reduced, and the manufacturing process can be simplified.

In the elastic member arranging step S41, the thread-like or band-like elastic members 73 may be arranged at intervals in the orthogonal direction CD. The stretchability of the stretchable member 73 is not hindered due to the process of forming the joint portion 75, and the degree of freedom in arrangement of the stretchable member 73 can be increased. By improving the degree of freedom in arranging the stretchable members, folds can be formed in intended positions and in intended shapes, and a composite sheet having desired cushioning properties can be obtained.

(6) Manufacturing Method of Absorbent Article Next, a manufacturing method of the absorbent article 10 including the composite sheet 70 described above will be described. For the steps other than the steps described below, the steps of the conventional manufacturing method for absorbent articles can be used. The absorbent article manufacturing method includes a belt forming step of forming a waist belt using the composite sheet 70 obtained by the composite sheet 70 manufacturing method. By providing a waist belt having a composite sheet with high cushioning properties, the feel around the waist can be improved.

In the belt forming process of the rear waist belt 30 of the present embodiment, in the composite sheet obtained by the manufacturing method of the composite sheet, the second sheet 72 is folded back around the second fold line FL72 to form the rear third exterior sheet 39. Then, the back cover sheet 37 is arranged with the absorbent main body 40 interposed therebetween.

In the belt forming step, the waist belt 15 may be formed by arranging the first sheet continuous body C71 side of the composite sheet on the skin surface side of the absorbent article. It is possible to improve the cushioning properties of the side that comes in contact with the skin, and to improve the wearer's touch. More preferably, the waist belt 15 may be formed so that the first sheet 71 of the composite sheet 70 is positioned on the surface of the absorbent article closest to the skin. According to such a configuration, it is possible to improve the feel on the wearer's skin.

In a modification, in the belt forming step, the waist belt 15 may be formed by arranging the second sheet continuous body C72 side of the composite sheet 70 on the skin surface side of the absorbent article. The feel when the absorbent article 10 is touched from the outside can be improved, and the sense of security when the wearing assistant touches the absorbent article 10 from the outside can be enhanced. More preferably, the waist belt 15 may be formed so that the first sheet 71 of the composite sheet 70 is located on the side of the absorbent article that is closest to the non-skin side. According to such a configuration, it is possible to further improve the feel when the absorbent article is touched from the outside.

A method for manufacturing an absorbent article may include an absorbent body forming step and a belt joining step. The absorbent main body forming step comprises an absorbent core having a absorbent material, a skin-side sheet arranged on the skin-side side of the absorbent core, and a non-skin-side sheet arranged on the non-skin side of the absorbent core. Lamination to form an absorbent body. The belt joining step joins the absorbent main body obtained by the absorbent main body forming step and the waist belt obtained by the belt forming step. By separately manufacturing the waist belt 15 and the absorbent main body 40, they can be stably manufactured according to their intended specifications. By providing the waist belt 15 having the composite sheet 70 with high cushioning properties, it is possible to obtain an absorbent article with excellent touch.

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.

A composite sheet and an absorbent article having high cushioning properties can be obtained by improving the degree of freedom in arranging joints and elastic members in the composite sheet.

10: Absorbent article 20: Front waist belt 22: Front rubber thread 25: Front first exterior sheet (first sheet)
26: Front second exterior sheet (second sheet)
27: Front cover sheet (first sheet)
28: Exterior stretchable sheet (stretchable member)
30: Rear waist belt 35: Rear first exterior sheet (first sheet)
36: Rear second exterior sheet (second sheet)
37: Rear cover sheet 38: Rear thread rubber (elastic member)
39: Rear third exterior sheet 40: Absorbent main body 40R: Rear edge 41: Liquid-impermeable sheet 42A: Skin sheet 42B: Main body sheet 50: Absorbent core 60: Side joints 70: Composite sheet 71: First sheet 71R: trailing edge 72: second sheet 72R: trailing edge 73: elastic member 75: joint portion 77: contact region C71: first sheet continuum C72: second sheet continuum C76: laminated continuum D1: First direction D2: Second direction FL71: First fold line FL72: Second fold line S1: Front waist region S2: Back waist region S3: Crotch region S100: Composite sheet manufacturing method S11: First sheet forming step S21: Second Sheet conveying step S31: Adhesive application step S41: Elastic member placement step L: Front-back direction T: Thickness direction T1: Skin side T2: Non-skin side W: Width direction

Claims (8)

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 that overlaps the absorbent main body in the thickness direction in at least one of the front waist region and the back waist region,
The waist belt is
a first sheet having a laminate in which two or more sheets are laminated;
a second sheet arranged to overlap with the first sheet;
a stretchable member joined to the first sheet and the second sheet between the first sheet and the second sheet and stretchable in a first direction;
A joint portion for joining the sheets constituting the laminate is provided in the first sheet so as not to reach the second sheet,
A plurality of the joints are provided at intervals in a plan view,
A first crease formed by folding the sheets forming the laminate is provided along the width direction on the outer edge of the first sheet in the front-rear direction,
The first fold line is arranged outside the front-rear direction outer edge of the absorbent main body in the front-rear direction,
A second fold formed by folding the second sheet is provided along the width direction on an outer edge of the second sheet in the front-rear direction,
The second fold line is arranged outside the front-rear direction outer edge of the absorbent main body in the front-rear direction,
The absorbent article , wherein the first fold of the first sheet is arranged between the second sheets folded via the second fold . 2. The absorbent article according to claim 1, wherein said first sheet is positioned closer to the skin than said second sheet. The first sheet and the second sheet are composed of a nonwoven fabric or a woven fabric having fibers,
3. The absorbent article according to claim 1 or claim 2 , wherein the basis weight of the fibers of the first sheet is higher than the basis weight of the fibers of the second sheet. The elastic members are provided in a plurality at intervals in a second direction orthogonal to the first direction,
4. The absorbent article according to any one of claims 1 to 3 , wherein said joining portion is arranged across said plurality of stretchable members. 5. The absorbent article according to any one of claims 1 to 4, having a contact area where said first sheet and said second sheet contact. The absorbent article according to any one of claims 1 to 5 , wherein the edges of the laminate are provided with creases formed by folding sheets forming the laminate. The sheets constituting the laminate are joined together with an adhesive,
The elastic member is joined between the first sheet and the second sheet with an adhesive,
7. The adhesive according to any one of claims 1 to 6 , wherein the basis weight of the adhesive that bonds the laminate is lower than the basis weight of the adhesive that bonds the first sheet and the second sheet. absorbent article. The elastic members are provided in a plurality at intervals in a second direction orthogonal to the first direction,
A plurality of the joints are provided at intervals in the second direction,
The absorbent article according to any one of claims 1 to 7 , wherein the pitch of the joints in the second direction is shorter than the pitch of the elastic members in the second direction.

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