WO2023002691A1

WO2023002691A1 - Absorbent article

Info

Publication number: WO2023002691A1
Application number: PCT/JP2022/012088
Authority: WO
Inventors: 由美則元
Original assignee: 大王製紙株式会社
Priority date: 2021-07-21
Filing date: 2022-03-16
Publication date: 2023-01-26
Also published as: JP2023016093A

Abstract

This absorbent article comprises: side sheets 7 respectively disposed on both lateral sections of a skin-contacting surface side and having double sheet parts formed inward in the width direction; and a thread-like elastic stretchable member 9 disposed between the double sheet parts. A three-dimensional gather where an inward-side section 7a of the side sheet stands on the skin side is formed due to a contractive force of the thread-like elastic stretchable member 9. An aligning junction portion 10 is provided at least to the rear side of the three-dimensional gather forming section, and is formed by a plurality of protrusions 11 that are disposed along the longitudinal direction and cause the double sheet parts of the side sheets 7 to integrally bulge toward the skin side, and adhesive sections 12 adhering the side sheets 7, 7 together so as to fill in gaps between the protrusions 11, 11. The thread-like elastic stretchable member 9 is provided along the longitudinal direction at a site other than the aligning junction portion 10 in a state not joined to the side sheets 7.

Description

absorbent article

The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads. More specifically, the present invention relates to three-dimensional gathers that stand up against the skin due to the contractile force of thread-like elastic stretchable members on both sides of the skin-contacting side. It relates to an absorbent article in which is formed.

Conventionally, as an absorbent article N, for example, as shown in FIGS. It is known to interpose an absorbent body 52 made of cotton-like pulp or the like between it and a liquid surface sheet 51, and to arrange

side sheets

53, 53 made of nonwoven fabric on both sides of the skin-contacting side. there is In the absorbent article N, the inner portion 53a of the side sheet 53 is folded back in the width direction to form a folded portion, and one or more strips are formed between the

side sheets

53, 53 of the folded portion along the longitudinal direction. By arranging the thread-like elastic stretchable members 54 in a stretched state, three-

dimensional gathers

55, 55 that stand up on the skin side due to the contractile force of the thread-like elastic stretchable members 54 are formed over a predetermined section in the longitudinal direction.

The side sheets 53 of the absorbent article N form three-dimensional gathers 55 over a predetermined longitudinal section (three-dimensional gather forming section) including at least a section corresponding to the bodily fluid discharge region H of the wearer. By bringing the tip of the three-dimensional gathers 55 into close contact with the body, the body fluid can be dammed up and side leakage can be prevented. In addition, in the section (fixed section) on the front and rear end sides of the section where the three-dimensional gathers are formed, the thread-like elastic stretchable member 54 is attached to the side sheet 53 so that the contractile force of the thread-like elastic stretchable member 54 does not act on the side sheet 53 . The side sheet 53 is folded and laminated on the side of the absorbent body 52 and joined.

Many improvements have been made to this type of absorbent article. For example, Patent Document 1 below discloses an absorbent article having a pleated structure with high alignment and excellent appearance. According to Patent Document 1, the disclosed pleated structure has a compound stretchable part that can stretch in one direction, and the compound stretchable part comprises two sheet materials and is disposed between the two sheet materials. The plurality of elastic members extend along the one direction and are spaced apart in a direction orthogonal to the one direction. At least one of the two sheet materials has a plurality of high-density portions in which the two sheet materials are not directly joined together, and the high-density portions include a plurality of high-density portions. of the elastic members, and is intermittently formed in plurality in the extending direction of the one elastic member. In addition, in the contracted composite stretchable portion, one sheet material has a fold structure deformed so as to have a plurality of recessed streaks having a high-density portion at the bottom and protruding streaks located between the recessed streaks. is formed.

By adopting such a structure, the appearance of the three-dimensional gathers is excellent in the three-dimensional gathers forming section where the fold structure is formed in the side sheets by the contractile force of the thread-like elastic elastic members. However, in the fixed section on the front and rear ends, that is, in the section where the side sheet is not joined to the side sheet and the side sheet is folded and fixed to the absorbent body side, the thread-shaped elastic stretchable member is not attached during the manufacturing process, for example. At the time of cutting, the end portions of the thread-like elastic stretchable members were vigorously contracted, and as shown in FIG. 9, the side sheets were entangled or twisted, and the appearance was poor. Such a phenomenon tends to occur on the rear side where the length of the fixed section is longer than on the front side. In particular, when using a thread-like elastic elastic member of a color other than white (for example, light blue), the state of tangling or twisting can be clearly seen from the outside, and the user feels that the quality of the absorbent article is inferior. can make an impression.

In order to prevent such tangling and twisting of the ends of the thread-like elastic stretchable member due to cutting, the following Patent Document 2 discloses an elastic body in which a leak-proof portion is arranged along the longitudinal direction of the absorbent article. and a sheet arranged along the longitudinal direction to wrap the elastic body and at least a part of which is fixed to the surface sheet. The leak-proof part has a central region in the longitudinal direction and a pair of end regions located outside the central region in the longitudinal direction, and the elastic body comprises at least the boundary between the central region and the end regions, It has a fixed portion fixed to the sheet while the elastic body is stretched in the longitudinal direction, and a free end which is located outside the fixed portion in the longitudinal direction and is not fixed to the sheet. The end region has a bonded portion subjected to bonding processing for bonding portions of the sheets facing each other and a non-bonded portion not subjected to bonding processing, and the free end is connected to the non-bonded portion. are arranged.

JP 2020-195504 A JP 2010-264161 A

In Patent Document 2, as shown in paragraph [0073] of the specification of Patent Document 2 and FIG. It is described that they may be provided on all parts other than the contacting parts. By adopting this configuration, it is believed that the ends of the elastic body can be prevented from being entangled or twisted.

However, in the absorbent article described in Patent Literature 2, since the bonded portions are formed by embossing, when the bonded portions are provided in all areas other than the portion where the elastic body and the sheet come into contact with each other, the sheet is compacted by the embossing. There is a problem that the welded portion directly contacts the skin surface of the wearer, resulting in poor touch feeling.

Accordingly, an object of one aspect of the present invention is to provide an absorbent article that improves the alignment of the end portions of the thread-like elastic stretchable members and has a good touch.

As one aspect for solving the above-mentioned problems, a side seat is arranged along the longitudinal direction on both sides of the skin contact surface side, and a double seat portion is formed on the inner side in the width direction; and a thread-like elastic stretchable member arranged along the longitudinal direction between the double sheet portions, and the side sheet is stretched in a predetermined longitudinal section including the wearer's bodily fluid discharge part by the contractile force of the thread-like elastic stretchable member. A three-dimensional gather that stands up on the skin side is formed in the inner side part of the double sheet part integrally bulging to the skin side at least behind the section in which the three-dimensional gather is formed. a plurality of portions are arranged along the longitudinal direction, and an alignment joint portion is provided in which a bonding portion for bonding the side sheets of the double sheet portion is arranged so as to fill the gap between the convex portions. The absorbent article is provided, wherein the thread-like elastic stretchable member is provided along the longitudinal direction at a portion other than the alignment joint portion in a state in which the thread-like elastic stretchable member is not joined to the side sheet.

According to one aspect of the present invention, it is possible to provide an absorbent article that prevents tangling and twisting of the end portions of the thread-like elastic stretchable member and has a good touch.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially broken development view of the sanitary napkin 1 which concerns on this invention. FIG. 2 is a view taken along line II-II of FIG. 1; FIG. 2 is a view taken along line III-III in FIG. 1; 4 is an enlarged plan view of a portion provided with alignment joints 10. FIG. FIG. 5 is a view taken along line VV in FIG. 4; FIG. 11 is a plan view showing a modified example of the convex portion 11; FIG. 8 is an enlarged plan view of a portion provided with alignment joints 10 according to a modification; Fig. 10 is an exploded view of a sanitary napkin 1 according to another embodiment; FIG. 2 is a development view showing a conventional absorbent article N; FIG. 10 is a view taken along line XX of FIG. 9;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
The sanitary napkin 1 according to the present invention comprises, as shown in FIGS. ), an absorbent body 4 made of cotton-like pulp or synthetic pulp, etc., interposed between the two

sheets

2, 3; A side seat 7 is provided over substantially the entire length in the longitudinal direction. Around the absorber 4, the outer edges of the backsheet 2 and the topsheet 3 are joined at the front and rear edges thereof by a joining means such as hot-melt adhesive, heat sealing, or ultrasonic sealing. In addition, the back sheet 2 extending laterally beyond the absorbent body 4 and the side sheets 7 are joined to the side sheets 7 by a joining means such as a hot-melt adhesive, heat sealing, or ultrasonic sealing. Thus, a flap portion is formed in which no absorber is interposed. In the illustrated example, the absorbent body 4 is surrounded by an enveloping sheet 5 made of crepe paper, non-woven fabric, or the like in order to retain the shape of the absorbent body 4 and improve diffusibility, but the enclosing sheet 5 is not provided. may Although not shown, a second sheet made of hydrophilic non-woven fabric or the like having substantially the same shape as the topsheet 3 may be disposed adjacent to the non-skin side of the topsheet 3 .

The structure of the sanitary napkin 1 will be further detailed below. A sheet material having at least water impermeability such as polyethylene is used for the back sheet 2, but it is desirable to use a material having moisture permeability from the viewpoint of preventing stuffiness. The water-impermeable/moisture-permeable sheet material is produced by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. A sheet is preferably used. One or a plurality of adhesive layers (not shown) are formed along the longitudinal direction of the napkin on the non-skin side (outer surface) of the back sheet 2 of the main body portion where the absorbent body 4 is interposed, and when worn on the body The napkin 1 for use is fixed to the shorts. As the back sheet 2, a polylaminated nonwoven fabric obtained by laminating a plastic film and a nonwoven fabric may be used.

For the surface sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used. Materials constituting the nonwoven fabric include olefin-based, polyester-based, polyamide-based synthetic fibers such as polyethylene or polypropylene, recycled fibers such as rayon and cupra, and natural fibers such as cotton. In addition, a nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is superior in flexibility and drapeability, and the thermal bond method is superior in bulkiness and compression recovery. When a large number of through-holes are formed in the surface sheet 3, body fluids are rapidly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but preferably short fibers are used in order to produce the feel of a terry cloth. In order to facilitate the embossing process, it is preferable to use olefin fibers such as polyethylene or polypropylene having a relatively low melting point. In addition, composite fibers of core-sheath type fibers, side-by-side type fibers, and split type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath can also be preferably used.

The absorbent body 4 interposed between the backsheet 2 and the topsheet 3 is made of, for example, cotton pulp and a water-absorbent polymer. The water-absorbing polymer is mixed in the pulp constituting the absorbent body, for example, as granular powder. Pulp includes chemical pulp obtained from wood, cellulose fiber such as dissolving pulp, and artificial cellulose fiber such as rayon and acetate, and softwood pulp with long fiber length is more functional and expensive than hardwood pulp. is preferably used in terms of

Synthetic fibers may also be mixed in the absorber 4. Synthetic fibers may be, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof. There may be. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a high-melting-point fiber as a core and a low-melting-point fiber as a sheath can also be used. If the synthetic fiber is a hydrophobic fiber, it is preferably surface-treated with a hydrophilizing agent so as to have affinity for body fluids.

In the illustrated example, the width dimension of the surface sheet 3 is slightly longer than the width of the absorbent body 4, as shown in the cross-sectional views of FIGS. A side sheet 7 different from the surface sheet 3 is arranged on the outer side. The side sheet 7 is made of a nonwoven fabric material that has undergone an appropriate water-repellent treatment or hydrophilic treatment in order to prevent permeation of menstrual blood, vaginal discharge, etc., or to improve the feel of the skin. configured as follows. The side sheet 7 may be made of natural fiber, synthetic fiber, regenerated fiber, or the like, and may be formed by an appropriate processing method. In addition, it is preferable to use a nonwoven fabric with a reduced basis weight and air permeability. Specifically, it is desirable to use a non-woven fabric with a basis weight of 13 to 23 g/m ² , and in order to reliably prevent permeation of bodily fluids, silicone-based, paraffin-based, alkylchromic chloride-based water repellents, etc. A water-repellent nonwoven fabric coated with is preferably used.

As shown in FIGS. 2 and 3, the side sheet 7 is formed by applying an adhesive such as a hot-melt adhesive over a range from a predetermined inner position to the outer edge of the back sheet 2 in a portion outside the intermediate portion in the width direction. It is at least partially adhered to the backsheet 2 . The laminated sheet portions of the side sheets 7 and the back sheet 2 form side flap portions on both sides of the absorbent body 4 in which the absorbent body 4 is not interposed.

The side flap portions are a pair of left and right wing-shaped flap portions which extend from the side edge of the absorbent body 4 at a side portion position substantially corresponding to the bodily fluid discharge portion H of the wearer. W, forming W. Further, the side flaps include a pair of left and right hip hold flaps _WB , _WB , which extend from the side edges of the absorbent body 4 to a position on the buttock side (rear side). Form. An adhesive layer (not shown) is provided on the outer surface side (the outer surface side of the back sheet 2) of these wing-shaped flap portions W, W and the hip hold flap portions W _B , W _B . When worn on shorts, the wing-shaped flap portions W, W are folded back to the opposite side (back sheet 2 side) at the folding line RL position (FIG. 1) of the base end portion, and wrapped around the crotch portion of the shorts and fastened. In addition, the hip hold flap portion _WB is attached to the inner surface of the shorts and covers the wearer's buttocks when worn.

The inner side portion 7a of the side seat 7 is folded back in the width direction to form a double seat portion (a portion where the side seats are double stacked). Between the double sheet portions, one or a plurality of thread-like elastic

stretchable members

9, 9, . . . are arranged along the longitudinal direction. The thread-like elastic

stretchable members

9, 9... are joined to the

side sheets

7, 7 in a stretched state at the intermediate portion in the longitudinal direction including the bodily fluid discharge portion H of the wearer at both ends of the section or at appropriate positions in the longitudinal direction. ing. On the other hand, the thread-like elastic

stretchable members

9, 9, . The double sheet portion of the side sheet 7 is an intermediate portion in the longitudinal direction including the bodily fluid discharge portion H of the wearer, and in the section where the thread-like elastic

elastic members

9, 9 . . . 2, they are arranged in a state in which they can protrude toward the wearer's skin side without being joined to each other. In the section where the thread-like elastic

elastic members

9, 9... are not joined to the side sheets, which are on the end side in the longitudinal direction of the section, as shown in FIG. , and is adhered to the absorbent body 4 side. As a result, the section where the thread-like elastic

stretchable members

9, 9 . . . It becomes a three-dimensional gather formation section in which three-dimensional gathers BS, BS in which the side sheet 7 stands up on the skin side due to contractile force are formed in a left and right pair. On the other hand, the side sheet 7 is fixed to the absorber 4 on the longitudinal end side of the three-dimensional gathers forming section. The "inner side portion 7a" of the side seat 7 is a portion on the inner side in the width direction of the side seat 7, and as described above, the portion including the double sheet portion for forming the three-dimensional gathers BS. is.

As shown in FIG. 1, the skin-contacting surface side of the topsheet 3 is formed with compressed grooves 6 in a predetermined form. The pressed grooves 6 are recessed grooves formed by pressing the topsheet 3 from the skin-contacting surface side so that the topsheet 3 and the absorbent body 4 are integrally recessed toward the backsheet 2 side. The compressed grooves 6 are provided in pairs along the longitudinal direction on both sides of at least the area corresponding to the bodily fluid discharge portion H of the wearer.

[Joint for alignment]
In the present sanitary napkin 1, as shown in FIGS. 4 and 5, the double sheet portion of the side sheet 7 is integrated with the fixed section at least on the rear side of the three-dimensional gather forming section, that is, the double sheet A plurality of projections 11 are arranged along the longitudinal direction, the entirety of which bulges toward the skin. Alignment joints 10 are formed by arranging bonding portions 12 for bonding the

side sheets

7, 7 of the double sheet portion so as to fill the gaps between the

convex portions

11, 11, and are spaced apart in the width direction. Multiple are arranged side by side. Furthermore, thread-like elastic

stretchable members

9, 9, . . .

In the joint portion 10 for alignment, the

side sheets

7, 7 forming the double sheet portion are joined together by the convex portion 11 and the adhesive portion 12, so that the joint portion 10 for alignment contains the thread-like elastic elastic member 9. It is designed not to let you in. On the other hand, since the

side sheets

7, 7 forming the double sheet portion are not joined to each other in other parts, the thread-like elastic stretchable member 9 can enter.

Therefore, by arranging a plurality of alignment joints 10 at intervals in the width direction at least on the rear side of the three-dimensional gather forming section, when the thread-like elastic stretchable member 9 is cut, the ends of the thread-like elastic stretchable member Even if the aligning joint 10 suppresses waviness in the width direction, the end portions of the thread-like elastic elastic members 9 are arranged in a longitudinally aligned state, and that arrangement is maintained. Therefore, alignment can be improved.

In particular, since the joint portion 10 for alignment is formed by combining the convex portion 11 and the bonding portion 12, and the bonding portion 12 is provided so as to fill the gap between the convex portions 11, the thread-like elastic elastic member 9 is formed by the bonding portion 12. The room for entering the alignment joint 10 is completely or almost blocked, and the alignment of the thread-like elastic stretchable member 9 can be more reliably improved. If the adhesive portion 12 were not provided, the end portion would contract vigorously when the filamentous elastic stretchable member 9 was cut, and the end portion would undulate due to the shrinkage force at that time, and the gap between the

convex portions

11, 11 would be formed. likely to enter. Further, when the heat sealing of the projections 11 (for example, embossing by an embossing roll to be described later) is incomplete, the undulation of the thread-like elastic stretchable member 9 causes the

side sheets

7, 7 to be disconnected from each other, resulting in alignment bonding. There is a risk that the thread-like elastic elastic member 9 may enter the portion 10 .

Since the alignment joints 10 are formed with protrusions 11 formed by bulging the side sheets 7 toward the skin, the tips of the protrusions 11 come into contact with the wearer's skin. Therefore, the outline of the convex portion 11 hardened by heat sealing, the adhesive portion 12 hardened by the adhesive, and the like are structured so as to be less likely to come into contact with the skin surface, and a good touch can be realized.

Furthermore, at least on the rear side of the three-dimensional gather forming section, the thread-like elastic stretchable member 9 is arranged in a state in which it is not joined to the side sheet 7, so that the contractile force of the thread-like elastic stretchable member 9 bends the end of the sanitary napkin 1. Extreme inward curving is suppressed, and deterioration of wearing comfort is suppressed.

In order to form the convex portion 11, the inner side of the side sheet 7 in the width direction is folded back in the width direction with the thread-like elastic

elastic members

9, 9, . . . The side sheet 7 is placed between a first embossing roll having protrusions corresponding to the protrusions 11 and a second embossing roll having surface depressions corresponding to the protrusions of the first embossing roll. and applying heat or ultrasonic waves to at least the contoured portion when the protrusions of the first embossing roll and the depressions on the surface of the second embossing roll are engaged with each other.

The convex portion 11 has a contour line formed by a closed curve, and a plurality of such convex portions 11 are arranged along the longitudinal direction. In the form example shown in FIG. 4, the planar shape of the convex portion 11 is circular, but as shown in FIG. etc. In this way, by forming the outline of the convex portion 11 with a closed curve, even if the side sheet 7 is stretched during the manufacturing of the sanitary napkin 1 or the wearing of the sanitary napkin 1, the convex portion 11 can be It is easy to maintain the state of protruding to the skin side, and the feeling of wearing can be improved more reliably. When a plurality of protrusions 11 having outlines formed by closed curves are arranged in the longitudinal direction, there is a gap in the width direction between the

adjacent protrusions

11, 11 at least on both sides. A depression is formed. A bonding portion 12 is provided so as to fill this recess. For example, when the

protrusions

11, 11 adjacent in the longitudinal direction are in contact with each other in the longitudinal direction, the depression in the width direction is a continuous contour line on one side of the

protrusions

11, 11 in the width direction, It may be a region in a plan view surrounded by a straight line connecting the side edges of the

protrusions

11 , 11 on one side in the width direction (positions protruding to one side in the width direction most). Further, when the

convex portions

11, 11 adjacent in the longitudinal direction are not in contact with each other in the longitudinal direction, the center line passing through the width direction center of the

convex portions

11, 11 . It may be a region in a plan view surrounded by a contour line and a straight line connecting the side edges of the

protrusions

11 , 11 on one side in the width direction.

The dimensions of the projections 11 are preferably 5 mm or less in each of the longitudinal direction and the width direction in order to reduce the contact area with the skin surface when worn. Also, the height of the convex portion 11 is preferably set to a height such that the outline of the convex portion 11 and the adhesive portion 12 are less likely to come into contact with the skin surface when worn. Specifically, the height is 1.5 to 5 mm. It's okay.

The

convex portions

11, 11 adjacent to each other in the longitudinal direction may be arranged in a row so that their outlines are connected to each other, or may be intermittently arranged with a predetermined distance therebetween. As shown in FIG. 4, when the contour lines of the projections 11 adjacent in the longitudinal direction are connected to each other, the shape of the projections 11 can be adjusted when the sanitary napkin 1 is manufactured or worn. It is preferable because it becomes easier to hold. In any case, the adhesive portions 12 are arranged on at least both side portions between the adjacent

convex portions

11, 11, respectively.

The adhesive part 12 can be formed by applying a hot-melt adhesive or the like between the double sheet parts of the side sheet 7 . The adhesive portion 12 is provided by applying an adhesive to at least one of the surfaces of the side sheet portions that are to form the double sheet portion, which face each other due to the formation of the double sheet portion. can be done.

The adhesive portions 12 are arranged so as to fill at least the gaps on both sides between the

convex portions

11, 11 adjacent to each other in the longitudinal direction so that both side edges of the joint portion 10 for alignment are substantially straight along the longitudinal direction. there is For example, a longitudinal straight line extending along the alignment of the right edges (positions protruding to the rightmost side) of the

projections

11, 11, . . . The adhesive part 12 is arranged so as to fill at least the area without the

convex parts

11, 11 ... in the area between the left edge (the position that protrudes leftmost) and the longitudinal straight line extending along the line. It is The bonding portion 12 is preferably arranged at a position not overlapping the convex portion 11, but may overlap the convex portion 11 to some extent. However, if the adhesive portion 12 overlaps the top portion of the convex portion 11, the adhesive may harden and the top portion of the convex portion 11 in contact with the skin surface may become hard. be arranged so that they do not overlap.

As shown in FIG. 4, when the convex portion 11 is formed in a circular shape, the adhesive portion 12 is a triangle that tapers toward the center in the width direction, or a side facing the contour line of the convex portion 11 is inward. It can be formed in a substantially triangular shape with a bulging curve.

As shown in FIG. 4, the bonding portions 12 are arranged in pairs on both sides between the

convex portions

11, 11 adjacent in the longitudinal direction. In addition, when the

projections

11, 11 adjacent to each other in the longitudinal direction are separated from each other, the bonding portion that connects the left and

right bonding portions

12, 12 between the

projections

11, 11 adjacent to each other in the longitudinal direction is positioned at the center. By providing in the width direction, the integral bonding portion 12 may be formed. In any case, the adhesive portions 12 may be arranged on both sides between the

convex portions

11, 11 adjacent in the longitudinal direction so as not to create any recesses or gaps without the adhesive.

A plurality of alignment joints 10 consisting of the convex portions 11 and the adhesive portions 12 described above are arranged side by side at predetermined intervals in the width direction, three in the illustrated example. The separation width of the alignment joints 10 is defined by the straight line extending along the longitudinal alignment of the side edges of the protrusions included in one alignment joint and the alignment joints adjacent to the one alignment joint. It can be the distance between a straight line extending along the longitudinal alignment of the side edge of the convex portion included in the portion facing the one alignment joint. The separation width between the adjacent alignment joints 10, 10 is formed to be larger than the thickness of the front elastic elastic member 9, and is preferably about 1.5 to 3 times the thickness of the thread-like elastic elastic member 9. preferable. If it is less than 1.5 times the thickness of the thread-like elastic stretchable member 9, the separation width is too small, making it difficult to manufacture. , 10 . Therefore, there are cases where the thread-like elastic stretchable member 9 continues to be stretched even after cutting, making it impossible to form a desired three-dimensional gather. On the other hand, if it is larger than 3 times the thickness of the filamentous elastic stretchable member 9, when the filamentous elastic stretchable member 9 is cut and the ends of the filamentous elastic stretchable member 9 are vigorously contracted, the alignment joints 10, 10 will not be in contact with each other. There is a risk that undulations and twists will occur at the edges and the alignment will be degraded.

The length of the alignment joint 10 in the longitudinal direction is obtained when the ends of the thread-like elastic elastic members 9 are arranged substantially straight along the longitudinal direction from immediately behind the gather forming section in a natural state where no tensile force acts. Specifically, it is preferable to form the sanitary napkin 1 with a length of about ⅓ of the total length of the sanitary napkin 1 from the immediately rear portion of the gather forming section. By forming the aligning joints 10 in this range, the end portions of the thread-like elastic stretchable members 9 are well aligned, and the fit around the legs is not affected.

In the embodiment shown in FIG. 4, the alignment joints 10, 10, which are arranged side by side in the width direction, are located at different positions in the width direction, specifically, between the adjacent alignment joints 10, 10. Although the

projections

11, 11 . At a portion where the

convex portions

11 and 11 are adjacent to each other, the side sheet 7 on the upper layer side is pressed toward the lower layer side at the contour portion of the convex portion 11, thereby narrowing the space between the

side sheets

7 and 7 on the upper and lower layers. , the braking force when the thread-like elastic stretchable member 9 contracts (suppressing the shrinkage of the thread-like elastic stretchable member 9) compared to the portion where the adhesive portion 12 where the upper and

lower side sheets

7, 7 are simply laminated is adjacent. force) will increase. Considering this point, in the embodiment shown in FIG. 4 , although the left and right arrangements are reversed on both sides of the thread-like elastic elastic member 9 , the state in which the convex portions 11 and the adhesive portions 12 are respectively arranged on the left and right is continuous. Therefore, it is considered that the filamentous elastic member 9 contracts while receiving a substantially uniform braking force in the section where the alignment joint 10 is provided. On the other hand, in the embodiment shown in FIG. 7, on both sides of the thread-like elastic stretchable member 9, a plurality of regions where the

convex portions

11 and 11 face each other and regions where the

adhesive portions

12 and 12 face each other are arranged alternately. It is considered that the thread-like elastic elastic member 9 contracts while being repeatedly subjected to increasing and decreasing braking forces. In this way, although the mode of braking force action is different, both act with appropriate braking forces to reduce the momentum of the contractile force of the thread-like elastic stretchable members 9 and align the ends of the thread-like elastic stretchable members 9. It improves sexuality.

The alignment joints 10 may be arranged on both sides of the thread-like elastic elastic member 9 . However, in the case of the thread-like elastic stretchable member 9 arranged at the standing tip portion in the three-dimensional gather forming section, the alignment joint portion 10 may be arranged only on one side of the thread-like elastic stretchable member 9 . This is because the upright tip side serves as the folded portion of the side sheet 7, and undulations and twists of the thread-like elastic stretchable members 9 do not occur or hardly occur on the upright tip side. More specifically, as shown in FIGS. 4 and 7, an alignment joint is provided on the left side (opposite to the standing tip side) of the thread-like stretchable elastic member 9 on the rightmost side (outer side in the width direction) of the drawing. 10 is arranged, but the joint part 10 for alignment is not arranged on the right side (upright tip end side) of the thread-like stretchable elastic member 9 .

Among the manufacturing steps of the sanitary napkin 1 having the above configuration, the manufacturing process of the portion related to the alignment joints 10 will be described. After that, at a predetermined position of the side sheet 7, thread-like elastic

elastic members

9, 9, . The side portion 7a is folded back in the width direction to form a double sheet portion. After that, the side sheet 7 is passed between the first embossing roll and the second embossing roll to form the protrusions 11 , and then joined to both sides of the top sheet 3 . After that, it is cut along the outline of the product. Simultaneously with this cutting, the thread-like elastic

elastic members

9, 9, . . .

The thread-like elastic

elastic members

9, 9... may have the same white color as that of the side sheet 7, but may have a color other than white, such as light blue, in order to clearly see the state in which the ends are aligned. .

[Other form examples]
(1) In the above embodiment, the alignment joint 10 is provided only on the rear side of the three-dimensional gather forming section, but it can also be provided on the front side of the three-dimensional gather forming section.

(2) In the above embodiment, a plurality (three) of thread-like elastic elastic members 9 are arranged, and a plurality (three) of alignment joints 10 are arranged side by side at intervals in the width direction. As shown in , one line of thread-like elastic stretchable member 9 is arranged at the standing tip end of the three-dimensional gather forming section, and the alignment joint 10 is located on the side opposite to the standing tip side (the folded end side of the side sheet 7). One may be provided.

Specific embodiments of the present invention are described below.

(Appendix 1)
As an aspect according to Supplementary Note 1, a side seat is arranged along the longitudinal direction on both sides of the skin contact surface side, and a double sheet portion is formed on the inner side in the width direction, and the double sheet portion and a thread-like elastic stretchable member arranged along the longitudinal direction between the side sheets, and the inner side of the side sheet in a predetermined longitudinal section including the wearer's bodily fluid discharge part due to the contractile force of the thread-like elastic stretchable member. A three-dimensional gather is formed so that a portion of the sheet stands upright on the skin side, and at least on the rear side of the section in which the three-dimensional gather is formed, a convex portion formed by integrally swelling the double sheet portion toward the skin is formed in the longitudinal direction. a plurality of aligned joints are arranged along the ridges and are arranged so as to fill the gaps between the convex portions for bonding the side sheets of the double sheet portion to each other. An absorbent article is provided, wherein an elastic stretchable member is provided along the longitudinal direction at a portion other than the alignment joint portion in a state in which it is not joined to the side sheet.

In the aspect of Supplementary Note 1, at least behind the three-dimensional gathers forming section in which the three-dimensional gathers standing upright on the skin side are formed, the convex portion integrally bulging toward the skin side of the double sheet portion is formed in the longitudinal direction. a plurality of joints for aligning are arranged along the line and are arranged so as to fill the gaps between the convex portions for bonding the side sheets of the double sheet portion to each other, and the filamentous elastic A stretchable member is provided along the longitudinal direction at a portion other than the alignment joint portion in a state in which it is not joined to the side sheet. As a result, even if the ends of the thread-like elastic stretchable members are vigorously contracted when the thread-like elastic stretchable members are cut, the aligning joints suppress waviness in the width direction, so that the ends of the thread-like elastic stretchable members can be cut. Alignment of parts can be improved.

In addition, at the alignment joints, not the entire surface of the side sheet, but the tip of the protrusion formed by swelling the side sheet toward the skin comes into contact with the wearer's skin. can.

(Appendix 2)
As a mode according to Supplementary Note 2, there is provided the absorbent article according to Supplementary Note 1, wherein the convex portion has a contour line formed by a closed curve.

In the aspect of Supplementary Note 2, the convex portion has a contour line formed by a closing curve, so that even if the side sheet is stretched during the manufacturing process of the absorbent article or when the absorbent article is worn, a predetermined stress is applied. It is difficult to concentrate on the part of the skin, and the shape of the convex portion bulging toward the skin is easily maintained, so that a good wearing feeling can be obtained more reliably.

(Appendix 3)
As an aspect according to Supplementary Note 3, there is provided the absorbent article according to any one of

Claims

1 and 2, wherein the adhesive portions are arranged in recesses in the width direction between the convex portions adjacent to each other in the longitudinal direction. be.

In the aspect of appendix 3 above, the arrangement of the bonding portions is specifically defined, and the bonding portions are disposed in recesses in the width direction between adjacent convex portions in the longitudinal direction. By arranging the adhesive portions in this way, the space between the projections into which the thread-like elastic stretchable member enters is filled, so that undulation and twisting of the thread-like elastic stretchable member can be prevented. can be further improved.

(Appendix 4)
As a mode according to supplementary note 4, the absorbent according to any one of claims 1 to 3, wherein a plurality of the thread-like elastic elastic members are arranged, and a plurality of the alignment joints are arranged side by side at intervals in the width direction. A sexual item is provided.

In the aspect of appendix 4 above, when a plurality of the thread-like elastic stretchable members are arranged, a plurality of alignment joints are arranged side by side at intervals in the width direction accordingly.

(Appendix 5)
As an aspect according to Supplementary Note 5, the plurality of alignment joints arranged in parallel in the width direction are arranged at the same position in the width direction, or the alignment joints adjacent to each other are arranged at different positions in the width direction. There is provided an absorbent article according to claim 4 positioned in position.

In the aspect of Supplementary Note 5 above, when a plurality of the alignment joints are arranged side by side at intervals in the width direction, the overall pattern for arranging the alignment joints arranged side by side in the width direction is defined. there is

(Appendix 6)
As a mode according to appendix 6, there is provided the absorbent article according to any one of appendices 1 to 5, wherein the filamentous elastic stretchable member has a color other than white.

The aspect of appendix 6 above is intended for cases where a color other than white is used as the thread-like elastic stretchable member, because tangling and twisting of the ends of the thread-like elastic stretchable member are more conspicuous.

This application claims priority based on Japanese Patent Application No. 2021-120157 filed on July 21, 2021, the entire contents of which are incorporated herein.

DESCRIPTION OF SYMBOLS 1... Sanitary napkin 2... Back sheet 3... Top sheet 4... Absorbent body 5... Enveloping sheet 6... Compression groove 7... Side sheet 9... Thread-like elastic stretchable member 10... Alignment joint , 11...
Convex part, 12... adhesion part

Claims

a side seat that is arranged along the longitudinal direction on both sides of the skin contact surface side and has a double seat portion formed on the inner side in the width direction;
A thread-like elastic elastic member arranged along the longitudinal direction between the double sheet portions,
A three-dimensional gather is formed in which the inner side portion of the side sheet stands on the skin side in a predetermined longitudinal section including the bodily fluid discharge part of the wearer by the contractile force of the thread-like elastic stretchable member,
At least on the rear side of the section where the three-dimensional gathers are formed, a plurality of protrusions formed by integrally swelling the double sheet portion toward the skin are arranged along the longitudinal direction, and the gaps between the protrusions are separated. An aligning joint portion is provided in which a bonding portion for bonding the side sheets of the double sheet portion is arranged so as to be buried, and the thread-like elastic elastic member is not joined to the side sheet. An absorbent article provided along the longitudinal direction at a site other than alignment joints.
The absorbent article according to claim 1, wherein the convex portion has a contour consisting of closed curves.
The absorbent article according to any one of claims 1 and 2, wherein the adhesive portions are arranged in recesses in the width direction between the convex portions adjacent to each other in the longitudinal direction.
The absorbent article according to any one of claims 1 to 3, wherein a plurality of said filamentous elastic stretchable members are arranged, and a plurality of said joints for alignment are arranged side by side at intervals in the width direction.
A plurality of the alignment joints arranged side by side in the width direction are arranged at the same position in the width direction, or the adjacent alignment joints are arranged at different positions in the width direction. The absorbent article according to claim 4.
The absorbent article according to any one of claims 1 to 5, wherein the filamentous elastic stretchable member has a color other than white.