CN106132370B

CN106132370B - Absorbent article

Info

Publication number: CN106132370B
Application number: CN201580014050.8A
Authority: CN
Inventors: 中尾佑马; 神山泉; 铃木阳一; 福田优子
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2014-03-25
Filing date: 2015-03-17
Publication date: 2020-03-17
Anticipated expiration: 2035-03-17
Also published as: JP2015192862A; JP6442331B2; RU2016140596A; CN106132370A; WO2015146704A1; RU2016140596A3; RU2674845C2

Abstract

An absorbent article (1) of the present invention has a stomach-side section (A) disposed on the stomach-side of a wearer, a back-side section (B) disposed on the back-side of the wearer, and a crotch section (C) located therebetween, wherein at least one of the stomach-side section (A) and the back-side section (B) has stretchable sections (G1, G2) that stretch in the article transverse direction (Y). The stretchable sections (G1, G2) have an outer sheet (22) disposed on the side farther from the skin of the wearer and an inner sheet (23) disposed on the side closer to the skin of the wearer than the outer sheet, the outer sheet (22) and the inner sheet (23) are joined at joining sections (26) disposed in a dispersed manner so as to form a plurality of joining section rows (26S, 26P) along the longitudinal direction X of the article, the outer sheet (22) and/or the inner sheet (23) between adjacent joining section rows (26S, 26P) are deformed so as to project in the thickness direction of the stretchable section, so that a hollow section (30) is formed between the two sheets (22, 23), and an opening section (m) is formed so as to overlap the joining section (26) entirely or partially.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

Conventionally, there is known a pants-type disposable diaper having an outer cover and an absorbent body fixed to the outer cover, in which elastic members are arranged in the transverse direction of the diaper to form gathers at the peripheral edge portions of waist openings of the abdomen-side portion and the back-side portion or at positions lower than the peripheral edge portions in order to improve the fit of the diaper to a wearer.

It is also proposed to form a flexible stretchable and contractible portion by disposing the elastic member for forming wrinkles without being fixed to either of the two sheets sandwiching the elastic member.

For example, the present applicant has proposed an absorbent article such as a disposable diaper in which first two sheets constituting an outer covering are joined at joint portions formed discretely in the longitudinal direction and the lateral direction of the diaper, and an elastic member for wrinkle formation is disposed between the two sheets so as not to pass through the joint portions (see patent document 1).

Documents of the prior art

Patent document

Patent document 1 (Japanese patent application laid-open No. 2011-78477)

Patent document 2 (Japanese unexamined patent publication) No. Hei 3-251245

Disclosure of Invention

The present invention provides an absorbent article including: a ventral portion disposed on the ventral side of the wearer; a back side portion disposed on a back side of a wearer; and a crotch portion located between the front and back portions, and having an extensible portion that extends and contracts in the article transverse direction on at least one of the front and back portions. The expansion part comprises: an outer sheet disposed on a side farther from the skin of the wearer; and an inner layer sheet disposed on the side closer to the skin of the wearer than the outer layer sheet, wherein the outer layer sheet and the inner layer sheet are joined at a joint portion, and the joint portion is discretely disposed so that a plurality of rows are formed in the article transverse direction along a joint portion row in the article longitudinal direction. At least one of the outer layer sheet and the inner layer sheet between the adjacent joint line rows is deformed so as to project in the thickness direction of the stretchable part, so that a hollow part is formed between the two sheets, and a hole part is formed in the joint part so as to overlap the joint part entirely or partially.

Drawings

Fig. 1 is a perspective view showing a use state (wearing state) of a pants-type disposable diaper according to an embodiment of the present invention.

Fig. 2 is a developed plan view showing a state in which the diaper shown in fig. 1 is developed and extended as viewed from the skin contact surface side.

Fig. 3 is an enlarged plan view showing a joint line of the diaper shown in fig. 1 and a joint constituting the joint line in an enlarged manner.

Fig. 4 is an enlarged sectional view showing a cross section of the waistline stretch unit of the diaper shown in fig. 1 along the article transverse direction.

Fig. 5 is an enlarged sectional view showing a section of the waist stretch unit of the diaper shown in fig. 1 in the transverse direction of the article.

Fig. 6(a) to 6(h) are partially enlarged plan views showing a junction and an opening portion formed in the junction according to another embodiment of the present invention.

Fig. 7 is a sectional view showing a main part of still another embodiment of the present invention.

Fig. 8(a) and 8(b) are partially enlarged plan views of a ventral portion or a dorsal portion showing a joint line and a joint formation method according to still another embodiment of the present invention.

Detailed Description

According to the absorbent article proposed in patent document 1, the elastic member for wrinkle formation is disposed so as not to be fixed to the two sheets sandwiching the elastic member in whole or in part, and thereby the flexibility and the touch of the exterior body can be improved. Further, according to the technique of patent document 1, the two sheets sandwiching the elastic member form pleats having excellent flexibility by contraction of the elastic member, the skin touch of the exterior body is improved, and the concave portions between the pleats function as air passages, and the air permeability is also good. Further, patent document 1 describes that by forming a hole in a fold portion formed by contraction of an elastic member, air permeability and a heat seal property can be further improved.

However, when fine wrinkles having narrow arrangement pitches of the joint portions in the lateral direction of the article are formed in order to improve smoothness when the surface is touched with a hand, the exterior body is easily hardened because the joint portions are densely present even if the surface is smooth. Further, the performance required for commercial products such as disposable diapers has been increasing year by year, and it is desired to provide absorbent articles having further improved flexibility in addition to the skin touch. Patent document 2 describes that openings are provided near the waist opening or at the side portions of a pants-type diaper, but no proposal is made as to where the openings should be formed in relation to the joints or the gathers of the outer covering that form the hollow gathers.

The invention provides an absorbent article which is less likely to feel stuffy and has excellent skin touch and softness.

Hereinafter, an absorbent article according to a preferred embodiment of the present invention will be described with reference to the drawings.

A disposable diaper 1 according to an embodiment of the present invention will be described with reference to fig. 1 to 3. As shown in fig. 1, a disposable diaper 1 of the present embodiment is a pants-type disposable diaper and includes an outer package 2 and an absorbent body 3 fixed to the outer package 2. The diaper 1 has a front side portion a disposed on the front side of the wearer and a back side portion B disposed on the back side of the wearer when worn, and both ends in the article transverse direction Y in the front side portion a and both ends in the article transverse direction Y in the back side portion B are joined to form a pair of

side seals

4, 4. Further, a waist opening 5 and a pair of leg openings 6 are formed by this joining. The diaper 1 has a crotch portion C disposed in the crotch of the wearer between the stomach-side portion a and the back-side portion B.

The outer package 2 in the diaper 1 of the present embodiment includes a front sheet member 2A forming a front side portion a and a back sheet member 2B forming a back side portion B, and the front sheet member 2A and the back sheet member 2B are joined to a pair of

side seals

4, 4. As shown in fig. 2, the absorbent body 3 is stretched and fixed between the center portion of the front sheet member 2A in the article transverse direction Y and the center portion of the back sheet member 2B in the article transverse direction Y. The portions of the absorbent main body 3 overlapping the abdomen-side sheet member 2A and the back-side sheet member 2B are joined to the both

sheet members

2A, 2B entirely or partially by a known joining means such as an adhesive.

The outer package 2 may have a narrow region, for example, a region of 10mm or less, at both ends of the front-side or back-side sheet member in the article transverse direction Y, where the front-side and back-

side sheet members

2A and 2B are not joined to each other, and this case also includes a case where the front-side and back-side portions a and B are joined at both ends of the article transverse direction Y.

As shown in fig. 2, the diaper 1 of the present embodiment is formed symmetrically about an article longitudinal center line CL extending in the article longitudinal direction X. Therefore, in the following description, the right side in fig. 2 will be mainly described with respect to the left-right symmetric portion, and the left side and the right side have the same configuration except for the point of left-right symmetry.

The article longitudinal direction X is a direction from a portion disposed on the stomach side of the wearer, through a portion disposed on the crotch portion, to a portion disposed on the back side, and generally coincides with the longitudinal direction of the absorbent main body 3. On the other hand, as shown in fig. 2, the article transverse direction Y is a direction perpendicular to the article longitudinal direction X in a state where an absorbent article such as a diaper is unfolded and extended, and as shown in fig. 1, in a tubular waistline portion D formed by connecting the abdomen-side portion a and the back-side portion B, the direction coincides with the circumferential direction thereof. In addition, since the article longitudinal direction X is the vertical direction in the front-side portion a and the back-side portion B when worn, the waist opening 5 side is also referred to as the upper side or the upper side and the crotch portion C side is also referred to as the lower side or the lower side in each of the front-side portion a and the back-side portion B.

In the diaper 1 of the present embodiment, as shown in fig. 2, the front-side sheet member 2A and the back-side sheet member 2B constituting the outer package 2 each have: an outer sheet 22 forming the outer surface of the diaper; an inner layer sheet 23 disposed on the inner surface side of the outer layer sheet 22; and a plurality of linear elastic members 24 disposed between the two

sheets

22, 23 in an extended state, and each having a waist stretch section G1 and a lower waist stretch section G2. In the diaper 1 of the present embodiment, the outer sheet 22 forming the outer surface of the diaper is an outer sheet disposed on the side farther from the skin of the wearer, and the inner sheet 23 is an inner sheet disposed on the side closer to the skin of the wearer than the outer sheet in the outer package 2. The inner sheet 23 is the "inner sheet disposed closer to the skin of the wearer than the outer sheet" according to the present invention.

The waist stretch units G1 are formed on the outer side of each of the

longitudinal ends

3a, 3b of the absorbent main body 3 in the longitudinal direction X of the diaper 1. The waist stretch unit G1 is formed at the peripheral edge of the waist opening 5 and is disposed at the waist of the wearer when worn. The waist lower stretchable zone G2 is formed below the waist stretchable zone G1 and above the lower end of the side seal 4 in each of the abdomen-side sheet member 2A and the back-side sheet member 2B.

The outer sheet 22 and the inner sheet 23 are joined at a plurality of joints 26 formed discretely (discretely, dispersedly) in the waist stretch section G1 and the lower waist stretch section G2.

More specifically, as shown in fig. 2, the joint portions 26 formed by welding the outer sheet 22 and the inner sheet 23 are formed at intervals so as to form a line along the article longitudinal direction X in the waist stretch units G1 of the side sheet member 2A and the back sheet member 2B, and a plurality of lines of joint portion rows 26S formed by the plurality of joint portions 26 are formed at intervals in the article transverse direction Y.

The joint 26 formed by fusion-bonding the outer layer sheet 22 and the inner layer sheet 23 is also formed at intervals so as to form a line along the article longitudinal direction X in the waistline lower stretch units G2 of the abdomen-side sheet member 2A and the back-side sheet member 2B, and a plurality of lines of joint lines 26P formed by a plurality of joint lines 26 are formed at intervals in the article transverse direction Y.

In the article side region S, S in each of the side panel member 2A and the back panel member 2B, the joint line 26S of the waist stretch unit G1 and the joint line 26P of the lower waistline stretch unit G2 are formed in a continuous line in the article longitudinal direction X. The article side regions S, S are regions located on the outer side in the article transverse direction Y than the positions of the

side edges

3c, 3c of the absorbent main body 3.

In the waist stretch units G1 of the diaper 1 of the present embodiment, the positions of the joint portions 26 in the article longitudinal direction X are substantially the same in all the joint portion rows 26S. The plurality of elastic members 24 are arranged so as to extend in the article transverse direction Y through gaps between the joint portions of the joint portion rows 26S. These plural elastic members 24 are disposed between the outer sheet 22 and the inner sheet 23.

Similarly, in the waistline lower stretch units G2, G2, the positions of the joints 26 in the article longitudinal direction X are substantially the same in all the joint rows 26P. The plurality of elastic members 24 are arranged so as to extend in the article transverse direction Y through gaps between the joint portions of the joint portion rows 26P, respectively. These plural elastic members 24 are disposed between the outer sheet 22 and the inner sheet 23.

In the diaper 1 of the present embodiment, as shown in fig. 2, the stomach-side sheet member 2A and the back-side sheet member 2B each have a pair of outer fastening regions 27 each formed by joining the outer sheet 22 and the inner sheet 23 to each other with an adhesive therebetween on both sides of the longitudinal centerline CL of the article, and further have a main body-side fastening region 28 formed by joining the outer sheet 22 and the inner sheet 23 to each other with an adhesive therebetween in the vicinity of the position of the side edge 3c of the absorbent main body 3. The pair of outer fastening regions 27 are formed at locations spaced outward (side seal) from the main body side fastening region 28 in the article transverse direction Y of the abdominal sheet member 2A (abdominal portion a) and the back sheet member 2B (back portion B), respectively, more specifically, at or near the ends in the article transverse direction Y. The lateral securing region 27 preferably overlaps the side seal 4 in whole or in part.

In the waist stretch unit G1, a plurality of elastic members 24 are disposed across the pair of outer fixing regions 27, and these elastic members 24 are fixed between the

sheets

22 and 23 in each of the pair of outer fixing regions 27, but are not fixed to either of the

sheets

22 and 23 between the outer fixing regions 27.

In the lower waistline stretch unit G2, the elastic members 24 are disposed across the space between the outer fastening region 27 and the main body side fastening region 28, and these elastic members 24 are fastened between the

sheets

22 and 23 in each of the outer fastening region 27 and the main body side fastening region 28, but are not fastened to either of the

sheets

22 and 23 between the outer fastening region 27 and the main body side fastening region 28.

As shown in fig. 2, the main body side fixing region 28 may be formed so that the entire region overlaps the absorbent main body 3, or may be formed so as to extend over the inside and outside of the side edge 3c of the absorbent main body 3. The main body side fixing regions 28 may be formed at positions outside the side edges 3c of the absorbent main body 3 in the diaper transverse direction. The form in which the entire main body side fastening region 28 overlaps the absorbent main body 3 includes both a form in which the position of the diaper outer side end portion of the main body side fastening region 28 coincides with the position of the side edge 3c of the absorbent main body 3, and a form in which the main body side fastening region 28 is formed with a predetermined space between the side edges 3c of the absorbent main body 3.

In the waist stretch units G1, the joint line 26S is formed in a plurality of lines at substantially equal intervals in the article transverse direction X. More specifically, a plurality of the fastening regions are arranged at substantially equal intervals from the vicinity of one of the outer fastening regions 27 to the vicinity of the other outer fastening region 27. In the hip lower stretch unit G2, although a plurality of lines of the joint line 26P are formed at substantially equal intervals from the vicinity of one outer fastening region 27 to the vicinity of the other outer fastening region 27, the elastic member 24 is not disposed between the pair of main body side fastening regions 28, or the elastic member 24 is disposed in a state where a process such as cutting is performed so as not to exhibit elastic stretchability.

The joint 26 formed between the waist stretch unit G1 and the lower waist stretch unit G2 will be described.

As shown in fig. 3, both the joint 26 forming the joint line 26S formed in the waist stretch unit G1 and the joint 26 forming the joint line 26P formed in the lower waist stretch unit G2 have the opening portion m formed to entirely or partially overlap the joint 26.

As shown in fig. 3, the joint 26 of the diaper 1 of the present embodiment has left and right joint regions a, b on both sides of the opening portion m in the article transverse direction Y, and also has joint regions c, d above and below the opening portion m in the article longitudinal direction X. As a result, the opening portion m of the joint portion 26 of the diaper 1 of the present embodiment is surrounded by the joint regions a to d over the entire circumference.

In the joining regions a to d, the constituent resins (heat-fusible components constituting fibers, etc.) of the sheets constituting the outer layer sheet 22 and/or the inner layer sheet 23 are melted and solidified to join the two

sheets

22 and 23 to each other. The joint 26 of the diaper 1 of the present embodiment is formed by a joint forming step of superposing the outer sheet 22 and the inner sheet 23 and applying a thermal embossing process to the laminated portion, and the perforated portion m is formed by perforating the joint of the two

sheets

22 and 23 formed in the joint forming step. In the entire range of the joint portion formed in the joint portion forming step, portions other than the portion to be the hole portion m by the hole forming process are joint regions a to d.

In the joint portion forming step, for example, a thermal embossing device having an embossing roller and an anvil roller, that is, a device having a convex portion having a tip end surface on the outer peripheral surface of the embossing roller, the shape of which is the same as the contour of the joint portion 26, or the like can be used, and in the hole forming process, for example, a cutting device having a cutting roller and an anvil roller, that is, a device having a cutting blade on the outer peripheral surface of the cutting roller, the shape of which corresponds to the contour of the hole portion m, or the like can be used. When the hole forming process is performed simultaneously with the joint portion forming process, the above-described hot embossing device may be one in which the outer peripheral surface of the embossing roller has a protruding portion having a cutting edge or a protrusion with a tip end surface having a shape similar to the contour of the joint portion 26 and a shape corresponding to the contour of the hole portion m.

Further, a belt-shaped laminate body formed by laminating a belt-shaped outer layer sheet 22 and a belt-shaped inner layer sheet 23 may be subjected to a joint forming step or a perforation process simultaneously with the joint forming step alternately for each of the adjacent joint rows by 2 hot embossing devices separately disposed on the upstream side and the downstream side of the conveyance path while continuously conveying the laminate body in the longitudinal direction in the direction corresponding to the transverse direction of the diaper.

In the case where the periphery of the opening portion m is surrounded over the entire circumference by the joining regions where the outer layer sheet 22 and the inner layer sheet 23 are joined as described in the present embodiment, or in the case where the joining regions a, b are present on both the left and right sides of the opening portion m in the article lateral direction Y as shown in fig. 6(a) and 6(b), or in the case where the joining regions a, b, C surround three sides of the opening portion m as shown in fig. 6(C), or the like, the portion surrounded by the joining regions on the entire circumference or three sides, or the portion sandwiched between the joining regions a, b on both the left and right sides is regarded as a part of the joining portion 26, and it is determined whether or not the opening portion m overlaps the entire or part of the joining portion 26.

In addition, when the opening portion m is formed so as to overlap the whole or part of the joint portion of the semi-finished product formed in the joint portion forming step, the portion of the entire range of the joint portion which is lost by the formation of the opening portion m is also regarded as a part of the joint portion 26 of the finished diaper (absorbent article), and it is determined whether or not the opening portion m overlaps the whole or part of the joint portion 26. For example, in the joint 26 shown in fig. 6(d) and 6(e), although a part 26 'of the joint formed in the joint forming step disappears when the opening portion m is formed, the disappeared part 26' is also regarded as a part of the joint 26, and a part of the opening portion m overlaps the joint 26.

In the waistline lower stretch unit G2 of the diaper 1 of the present embodiment, as shown in fig. 4, contraction of the elastic member 24 (see fig. 2) disposed between the outer sheet 22 and the inner sheet 23 in an extended state deforms the sheet 22 and the sheet 23 between the adjacent joint line rows 26P so as to bulge in the thickness direction of the outer body 2, and a pleat 29 formed by the sheet 22 or the sheet 23 is generated between the adjacent joint line rows 26S, and a hollow portion 30 surrounded by the pleat 29 and the pleat 29 is formed between the two

sheets

22, 23.

As shown in fig. 5, in the waist stretch units G1 of the diaper 1 of the present embodiment, the elastic members 24 (see fig. 2) disposed between the outer sheet 22 and the inner sheet 23 in an extended state contract, whereby the

sheets

22 and 23 between the adjacent joint line rows 26S are deformed so as to protrude in the thickness direction of the outer body 2, respectively, whereby the gathers 29 formed of the sheets 22 or the

sheets

23 and 22R are generated between the adjacent joint line rows 26S, and the hollow portion 30 surrounded by the gathers 29 and the gathers 29 is formed between the two

sheets

22 and 23.

In the diaper 1 of the present embodiment, the sheet material constituting the outer sheet 22 of each of the front side portion a and the back side portion B is folded along the peripheral edge portion 51 of the waist opening 5 toward the skin contact surface side of the inner sheet 23, and the folded portion 22R covers the skin contact surface side of the inner sheet 23 of the waist stretch portion G1 (see fig. 5). The folded portion 22R is joined to the inner sheet 23 and/or the skin contact surface of the absorbent main body 3 by an adhesive applied to the entire surface or a part thereof, but is not welded at the joint portion 26.

The perforated portion m of the present invention preferably penetrates through the two

sheets

22 and 23 joined to form the hollow portion 30 and penetrates through the entire exterior body 2 (the stomach-side sheet member 2A or the back-side sheet member 2B) as shown in fig. 4, but may penetrate through the two

sheets

22 and 23 joined to form the hollow portion 30 as shown in fig. 5, and the through hole thereof may be covered with another sheet and does not penetrate through the exterior body 2 (the stomach-side sheet member 2A or the back-side sheet member 2B).

In addition, as the joint of the present invention, a joint in which three layers of the outer sheet 22, the inner sheet 23, and the folded portion 22R are integrated by hot embossing may be formed in the waist stretch portion G1, and an opening portion penetrating through the three layers may be formed in the joint.

According to the diaper 1 of the present embodiment, since the

joint lines

26S and 26P are formed by the joints 26 formed at intervals in the article longitudinal direction X, and the pleats 29 having a hollow interior are formed between the

joint lines

26S and 26P, the concave portions between the

pleats

29 and 29 formed on the outer surface side or the inner surface side of the diaper 1 or the hollow portions 30 when the inner sheet 23 is air-permeable function as air ducts, and moisture in the diaper 1 is easily emitted to the outside without being stuffy. The above description of "between the

joint lines

26S, 26P" means that the joint lines 26S in the waist stretching portion G1 and the joint lines 26P in the lower waist stretching portion G2 are connected to each other. Such a pleat 29 is preferably formed in at least a natural state in the waist stretch section G1 and/or the lower waist stretch section G2, and it is preferable that a space formed between the pleat 29 and the pleat 29 be maintained even in a worn state of the article.

Moreover, since the pleats 29 are flexibly deformed against a load in the thickness direction of the exterior body 2, the skin feel of the exterior body 2 is also good. In addition, in the waist stretch unit G1 and/or the lower waist stretch unit G2 of the diaper 1, since the elastic members 24 are disposed between the joint portions 26 adjacent in the article longitudinal direction and the joint portions 26 are not fixed to the

sheets

22 and 23, the outer cover 2 is more flexibly deformed against a load applied in the thickness direction in the pleats 29 formed by the

sheets

22 and 23, and the feel of the skin and the like is more excellent.

Further, in the diaper 1 of the present embodiment, since the opening portions m are formed in the joint portions 26 constituting the

joint portion rows

26S, 26P so that the entire opening portions m overlap the joint portions 26, the hardness of the joint portions 26 is reduced as compared with the case where the opening portions m are not present. This increases the flexibility of the waist stretch unit G1 and/or the lower waist stretch unit G2 and the flexibility of the outer body 2, and the outer body 2 is easily bent in the article longitudinal direction X or the article transverse direction Y.

The advantage of the improved flexibility of the outer body is that the outer body can be brought into contact with the skin over a large area, thereby providing a softer feel.

When the pitch P of the

joint line

26S, 26P is reduced to reduce the size of the pleats 29, the package 2 is easily hardened. Therefore, the effect of softening the exterior body by the opening portion m overlapping the joint portion 26 is more advantageous in this case.

The pitch P (see fig. 3) of the

joint rows

26S, 26P in the article transverse direction Y is preferably 5mm or more, more preferably 7mm or more, from the viewpoint of forming the concave portions between the pleats 29 and the pleats 29 to improve air permeability, is preferably 15mm or less, more preferably 13mm or less, from the viewpoint of forming the visually attractive pleats, and is preferably 5mm or more and 15mm or less, more preferably 7mm or more and 13mm or less, from the viewpoint of achieving both of these.

The pitch P is measured in a state where the stretchable portion is stretched in the article transverse direction (non-contracted state).

In the diaper 1 of the present embodiment, in each of the

joint rows

26S and 26P, the joints 26 constituting the plurality of joint rows are arranged in the article lateral direction Y, and the interval L2 (see fig. 3) between the adjacent joints in the article lateral direction Y is wider than the total width W (see fig. 3) of the joints 26. By widening the interval L2 between the joining portions 26, the pleats 29 of a size that covers the joining portions 26 when pressed are easily formed between the joining portions adjacent to each other in the article transverse direction Y, and when the exterior body 2 is brought into contact with the skin, the skin is less likely to directly contact the joining portions 26 and the opening portions m. This can provide a soft feeling without further discomfort. From this viewpoint, the ratio (L2/W) of the interval L2 between adjacent joint sections in the article transverse direction Y to the total width W of the joint sections is preferably 2 or more, and more preferably 2 or more and 10 or less.

The above-mentioned interval L2 between the adjacent joined portions in the lateral direction Y of the article is preferably 4mm or more, more preferably 6mm or more, from the viewpoint of forming the pleats 29 and the recesses between the pleats to improve air permeability, is preferably 14mm or less, more preferably 12mm or less, from the viewpoint of forming the pleats that are aesthetically pleasing, and is preferably 4mm or more and 14mm or less, more preferably 6mm or more and 12mm or less, from the viewpoint of achieving both of these two advantages.

The distance L2 between the joining portions adjacent in the article transverse direction is measured in a state where the stretchable portion is stretched in the article transverse direction (non-contracted state).

In the diaper 1 of the present embodiment, as shown in fig. 3, the opening portion m is formed so as to be accommodated within the width W in the article lateral direction Y of the joint portion 26 in which the opening portion is formed.

This prevents the opening portions m from extending to the pleats 29 and being conspicuous. The perforated portion m is not conspicuous when viewed from the outer surface side of the diaper, and has an advantage of not causing leakage or having a weak tensile strength, for example.

Further, the perforated portion m is formed so as to be accommodated within the width W in the lateral direction Y of the article in which the joint portion 26 of the perforated portion is formed when viewed from the inner surface side of the diaper, and for example, there is an advantage that the cut end portion of the sheet having the perforated portion does not directly contact the skin.

Here, the opening portion m is accommodated within the width W of the joining portion 26 in the article transverse direction Y, meaning that the opening portion m does not extend from both ends of the joining portion 26 in the same direction in the article transverse direction Y. In the joint portions 26 shown in fig. 6(a), 6(b), 6(c), 6(f), 6(g), and 6(h), respectively, the opening portion m is also accommodated within the width of each joint portion 26.

When the perforated portion m is not accommodated within the width W of the article transverse direction Y of the engaging portion 26 as shown in fig. 6(d) or 6(e), the length of the perforated portion m in the article transverse direction Y is preferably 40% or less, more preferably 30% or less, of the pitch P of the engaging

portion rows

26S, 26P.

As shown in fig. 3, the joint 26 of the present embodiment has joint regions a and b on both sides of the opening portion m in the article transverse direction Y.

In the diaper 1 of the present embodiment, the pleats 29 formed by the outer sheet 22 and the pleats 29 formed by the inner sheet 23 intersect with the plurality of elastic members 24, respectively, and extend continuously in the article longitudinal direction X, respectively, to provide aesthetic appearance, but by providing the joining regions a, b on both sides across the opening portion m, deformation of the opening portion m when the opening portion m extends in the lateral direction can be suppressed, and the aesthetic appearance of the pleats can be further improved.

From the viewpoint of accommodating opening portion m within width W of joining portion 26, and from the viewpoint of forming joining regions a, b on both sides of opening portion m, respectively, width W1 (length in the lateral direction of the article) of opening portion m is preferably 95% or less, more preferably 90% or less, and further preferably 20% or more, and more preferably 30% or more of total width W (length in the lateral direction of the article) of joining portion 26.

When the joining regions a and b are present on both the left and right sides of the opening portion m, the lengths La and Lb of the joining regions a and b in the article transverse direction Y are preferably 2.5% or more, more preferably 5% or more, and further preferably 47.5% or less, and more preferably 45% or less of the total width W of the joining portion 26 (the length in the article transverse direction), respectively.

The joint 26 having the joint regions a and b on both sides of the opening portion m may not have a joint region at a position above or below or both above and below the opening portion m as in the joint 26 shown in fig. 6(a) and 6(b) other than the joint 26 shown in fig. 3 in which the opening portion m is surrounded by the joint regions a to d over the entire circumference.

As shown in fig. 3, the joined portion 26 in which the opening portion m is surrounded by the joined region over the entire circumference is excellent in the tensile strength and the opening portion m is not easily deformed, in addition to the formation of the pleats extending in the longitudinal direction of the article.

On the other hand, like the joint portions 26 shown in fig. 6(a) and 6(b), the joint portions 26 having the joint regions a and b formed only on the left and right sides across the opening portion m are excellent in flexibility in bending in the lateral direction in addition to the formation of the pleats extending in the longitudinal direction of the article.

Further, in the joint portion 26 shown in fig. 6(a), the opening portion m extends from the upper and lower ends of the joint portion 26, but from the viewpoint of shape stability of the opening portion when the opening portion is not easily deformed and the stretchable portion is stretched in the lateral direction, it is preferable that the opening portion m does not extend from any of the upper and lower ends of the joint portion 26 as in the joint portion 26 shown in fig. 6 (b).

In addition, from the viewpoint of the formation of beautiful pleats extending in the article longitudinal direction X, the joining portion 26 is preferably long in the article longitudinal direction X. More specifically, the ratio (L1/W) of the length L1 in the article longitudinal direction X of the joint 26 to the total width W (the length in the article transverse direction Y) of the joint 26 is preferably 1.5 or more, more preferably 2 or more, and further preferably 12 or less, more preferably 10 or less.

As in the joint portions 26 shown in fig. 6(f) and 6(g), the length of the perforated portion m in the article longitudinal direction X may be substantially the same as the length of the article lateral direction Y, or the length of the article lateral direction Y may be longer than the length of the article longitudinal direction X, but as shown in fig. 3 and the like, the perforated portion m is also preferably shaped such that the length Lm in the article longitudinal direction X is longer than the length W1 in the article lateral direction Y, and is also preferably longer in the article longitudinal direction X, as in the joint portions 26. More specifically, the ratio (Lm/W1) of the length Lm in the article longitudinal direction X of the perforated portion m to the length W1 in the article transverse direction Y is preferably 1.0 or more, more preferably 1.5 or more, further preferably 2 or more, and further preferably 12 or less, more preferably 10 or less.

The length Lm of the opening portion m in the article longitudinal direction X is preferably 50% or more, more preferably 70% or more, further preferably 100% or less, further preferably 95% or less, further preferably 50% or more and 100% or less, further preferably 70% or more and 95% or less of the length L1 of the joining portion 26 in the article longitudinal direction X.

When the joining regions c and d are present above and below the opening portion m, the lengths Lc and Ld in the article longitudinal direction X of the joining regions c and d are preferably 1% or more, more preferably 5% or more, and further preferably 25% or less, and further preferably 20% or less, of the length L1 in the article longitudinal direction X of the joining portion 26, respectively.

In the case where the joining regions a, b are present on both the left and right sides of the article transverse direction X of the opening portion m and the joining regions c, d are present on both the upper and lower sides of the opening portion m, the total length (Lc + Ld) in the article longitudinal direction X of the joining regions c, d located above and below the opening portion m is preferably equal to or smaller than the total length (La + Lb) in the article transverse direction Y of the joining regions a, b located on both the left and right sides of the opening portion m, from the viewpoint of formation of beautiful pleats extending in the article longitudinal direction X and improvement of flexibility of the pleats. This reduces the hardness of the joint 26, makes the outer package 2 more likely to bend in the article transverse direction Y, improves flexibility, and makes it easier to form the pleats 29 extending in the article longitudinal direction X. The expression "equal" includes, for example, a case where the total length (Lc + Ld) is 80% to 120% of the total length (La + Lb). The total length (Lc + Ld) is preferably 120% or less, more preferably 110% or less, further preferably 100% or less, and further preferably 5% or more, more preferably 10% or more, and further preferably 20% or more of the total length (La + Lb). In each of the joining portions 26 illustrated in fig. 6(g) and 6(h), the total length (Lc + Ld) in the article longitudinal direction X of the joining regions c, d located above and below the opening portion m is smaller than the total length (La + Lb) in the article transverse direction Y of the joining regions a, b located on both the left and right sides of the opening portion m.

Fig. 7 shows the main part of another embodiment of the present invention. In the embodiment shown in fig. 7, in any of the stretchable and contractible portions G1 and the lower waistline stretchable and contractible portion G2, the outer sheet 22 disposed on the side farther from the skin of the wearer includes a stretchable sheet, and the inner sheet 23 disposed on the side closer to the skin of the wearer than the outer sheet 22 includes a non-stretchable sheet. In the embodiment shown in fig. 7, the outer layer sheet 22 and the inner layer sheet 23 in an elongated state are stacked, and the stacked portion is subjected to hot embossing to form a joint portion 26, and simultaneously with or after the step of forming the joint portion, opening processing is performed to form the perforated portion m. In the embodiment shown in fig. 7, the inner layer sheet 23 is bulged by contraction of the outer layer sheet 22 to form pleats 29, and a hollow portion 30 is formed between the two

sheets

22 and 23 at the portion where the pleats 29 are formed.

As the stretchable sheet, for example, a stretchable nonwoven fabric (hereinafter referred to as a stretchable composite nonwoven fabric) in which a substantially inelastic fiber layer is disposed on at least one surface of an elastic fiber layer and both fiber layers are joined by thermal fusion in a state where the constituent fibers of the elastic fiber layer maintain the fiber form, can be used.

When the stretchable composite nonwoven fabric described above is used as the outer layer sheet 22 and/or the inner layer sheet 23, thermoplastic elastomers such as styrene elastomers, polyolefin elastomers, polyester elastomers, polyurethane elastomers, and the like, and fibers made of elastic resins such as rubbers, can be used as the constituent fibers of the elastic fiber layer. As the constituent fibers of the inelastic fiber layer, fibers made of Polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide, or the like can be used.

As the stretchable composite nonwoven fabric, various known nonwoven fabrics can be used, and for example, a stretchable sheet described in japanese patent application laid-open No. 2008-179128, a stretchable sheet described in japanese patent application laid-open No. 2007-22066, a stretchable nonwoven fabric produced by the method for producing a stretchable nonwoven fabric described in japanese patent application laid-open No. 2007-22066, a laminate sheet described in japanese patent application laid-open No. 10-29259, and the like can be used.

By forming one of the outer layer sheet 22 and the inner layer sheet 23 from a stretchable sheet and forming the pleats 29 including the other sheet, the elastic body is not conspicuous in the appearance of a diaper or the like, and a three-dimensional contour like underwear can be provided.

In the diaper 1 described above, the side seal 4 is formed by overlapping the outer fastening region 27 on the front side portion a side and the outer fastening region 27 on the back side portion B side after the joint 26 is formed, and then hot embossing the portions. As the processing for forming the joint portion 26, ultrasonic sealing, laser, or the like may be used instead of the hot embossing processing, and as the processing for forming the side seal portion 4, ultrasonic sealing, laser, adhesive, or the like may be used instead of the hot embossing processing.

The absorbent body 3 has a liquid-permeable front sheet 31, a liquid-impermeable back sheet 32, and an absorbent body 33 disposed between the two sheets 31, 32. The liquid impermeability includes liquid impermeability and liquid impermeability. Further, a pair of leg

hole forming sheets

34, 34 are disposed on both side portions of the absorbent body 3. The sheet 34 for forming a three-dimensional barrier has an elastic member 35 for forming a three-dimensional barrier in the vicinity of an end edge near the article longitudinal center line CL, and when the diaper is worn, a portion having a predetermined width from the end edge rises by a contraction force of the elastic member 35 so as to be separated from the topsheet 31 to form a three-dimensional barrier.

The materials for forming the respective parts of the diaper 1 are not particularly limited, and the front sheet 31, the back sheet 32, the absorber 33, the three-dimensional barrier formation sheet 34, and the like may be the same materials as those conventionally used for such absorbent articles. For example, a liquid-permeable nonwoven fabric, an apertured film, a laminate of these, or the like can be used as the front sheet 31, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 32. As the absorber 33, an absorbent core including a fiber aggregate of a fiber material such as pulp or an absorbent core having a super absorbent polymer supported therein, and an absorber formed by coating a core sheet including tissue paper or a water-permeable nonwoven fabric, or the like can be used. As the sheet 34 for forming the three-dimensional enclosure, a stretchable film, a waterproof nonwoven fabric, a woven fabric, a laminate sheet thereof, or the like can be used.

The sheet materials constituting the outer layer sheet 22 and the inner layer sheet 23 are not particularly limited, and various sheet materials conventionally used for such articles can be used, but a nonwoven fabric is preferable, and a single-layer nonwoven fabric or a laminated nonwoven fabric having 2 or more layers including a hot-air nonwoven fabric, a hot-roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric and the like is preferable particularly from the viewpoint of flexibility and the like. Further, the nonwoven fabric and the film may be integrated into a sheet. Further, an exterior sheet including a nonwoven fabric, a film, or the like may be disposed on the non-skin contact surface side of the back sheet 32 in the crotch portion C.

The material for forming the

elastic members

24 and 35 is not particularly limited, and various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used. Examples of the material for forming the elastic material include synthetic rubbers such as styrene-butadiene, isoprene, and chloroprene rubber, natural rubber, EVA, elastic polyolefin, and polyurethane. As the form of the elastic member, a linear form (rubber thread or the like), a belt form (rubber sheet or the like), a multifilament linear form, or the like having a rectangular, square, circular, polygonal or the like cross section can be preferably used.

The present invention has been described above based on preferred embodiments thereof, but the present invention is not limited to the above embodiments and can be modified as appropriate.

For example, the outer covering may not be divided into the abdomen-side sheet member 2A and the back-side sheet member 2B. For example, the outer package may be configured such that the outer layer sheet 22 and the inner layer sheet 23 are each formed of one sheet that is continuous over the front side portion a, the crotch portion C, and the back side portion B, or the outer layer sheet 22 is formed of one sheet that is continuous over the front side portion a, the crotch portion C, and the back side portion B, and the inner layer sheet 23 is disposed only on one of the front side portion a and the back side portion B.

The waist lower stretchable part G2 may be configured to exhibit stretchability continuously from one side region S to the other side region S. The absorbent article of the present invention may be configured to include only one of the waist stretch units G1 and the lower waist stretch units G2. In the absorbent article of the present invention, instead of having the waist stretchable panel G1 and the underbody stretchable panel G2 in both the abdomen-side portion a and the back-side portion B, one or both of the waist stretchable panel G1 and the underbody stretchable panel G2 may be provided in only one of the abdomen-side portion a and the back-side portion B.

The absorbent article of the present invention may be configured such that the joint 26 having the opening m is provided only on one of the front side portion a and the back side portion B. From the viewpoint of air permeability, it is preferable that such a joint portion 26 is formed at least on the back side portion B.

As shown in fig. 8(a) and 8(B), a joint 26 having an opening m and a joint 26N having no opening m may be formed regularly on both or one of the ventral portion a and the dorsal portion B. In addition, both may be irregularly formed.

In the case where both the joining portions 26K having the opening portions m and the joining portions 26N not having the opening portions m are formed in the front side portion a or the back side portion B, the proportion of the joining portions 26K having the opening portions m in the number of all the joining portions 26 formed in the front side portion a or the back side portion B is preferably 10% or more, more preferably 30% or more, and preferably 50% or less from the viewpoint of not making a person think of leakage or the like, from the viewpoint of improving the feeling of softness or the like.

From the viewpoint of preventing leakage and the like, it is preferable that the joint portion 26 having the opening portion m is formed in the vicinity of the side seal 4, and the joint portion 26 having the opening portion m is not formed in the vicinity of the absorbent main body 3, and for example, when the article-side region S of the front-side sheet member 2A (the front-side outer covering) or the article-side region S of the back-side sheet member 2B (the back-side outer covering) is divided into the side of the absorbent main body 3 and the side of the side seal 4 so as to halve the length in the article transverse direction Y, it is preferable that the joint portion 26 having the opening portion m is formed more on the side of the side seal 4, and it is more preferable that the joint portion 26 having the opening portion m is formed on the side of the side seal 4 and the joint portion 26 having the opening portion m is not formed on the side of the absorbent main body 3.

The joint 26 may be rectangular as shown in fig. 3, or may be formed in other shapes such as a square, an oblong, and an oval as shown in fig. 6(f) to 6 (h). In addition, the opening portion m may be formed in other shapes such as a square, a rectangular circle, an oblong circle, or an oval shape instead of the rectangular shape.

It is preferable that a portion of one of the two sheets in opening portion m that is joined through joined portion 26 and a portion that passes through the other sheet overlap each other in the same shape and the same size, but not limited thereto.

The outer package 2 of the stomach side portion a or the back side portion B may be configured such that only the sheet constituting the outer layer sheet is folded at the peripheral edge portion of the waist opening as in the diaper 1 described above, but may be configured such that the sheet constituting the outer layer sheet and the sheet constituting the inner layer sheet are integrally folded, or may be configured such that neither the outer layer sheet nor the inner layer sheet has a folded portion. The folded portion of the outer sheet or the inner sheet may be joined to the opposing surface in a different form from the diaper 1, for example, joined to the opposing surface over the entire area.

The absorbent article of the present invention is not limited to a pants-type absorbent article, and may be a so-called open-type disposable diaper. As the pants-type absorbent article, pants-type sanitary napkins and the like can be cited in addition to pants-type disposable diapers for infants and adults. In a typical open-type disposable diaper, a fastener tape having a fastening portion including an adhesive portion or a male surface member (hook surface member) for mechanical surface fastening is provided on both side portions of a back side portion, and the diaper is worn by being brought into contact with an attachment buckle provided on an outer surface of a stomach side portion.

The hole forming process may be performed before or after the joint forming process. From the viewpoint of forming the opening portion m at a predetermined specific position with high accuracy in the relationship with the joining portion 26, particularly from the viewpoint of forming the opening portion m with high accuracy within the width W in the lateral direction of the article accommodated in the joining portion 26, the opening process is preferably performed simultaneously with or after the joining portion forming step, and more preferably performed simultaneously with the joining portion forming step.

The contents of the omitted part of the above-described embodiment and only one embodiment can be appropriately applied to other embodiments, and the contents of the respective embodiments can be appropriately substituted for each other between the embodiments.

The present invention further describes the following pants-type absorbent articles and the like in relation to the above-described embodiments of the present invention.

＜1＞

An absorbent article having a stomach-side portion disposed on the stomach-side of a wearer, a back-side portion disposed on the back-side of the wearer, and a crotch portion located between the stomach-side portion and the back-side portion,

an extensible part which is extensible in the transverse direction of the article is provided on at least one of the ventral part and the dorsal part,

the stretchable part has an outer sheet disposed on a side farther from the skin of the wearer and an inner sheet disposed on a side closer to the skin of the wearer than the outer sheet, the outer sheet and the inner sheet are joined at a joint part, the joint part is disposed in a dispersed manner such that a plurality of rows are formed in a transverse direction of the article along a joint part row in a longitudinal direction of the article, at least one of the outer sheet and the inner sheet of the adjacent joint part rows is deformed so as to be convex in a thickness direction of the stretchable part, so that a hollow part is formed between the two sheets, and an opening part is formed in the joint part so as to overlap the joint part entirely or partially.

＜2＞

The absorbent article according to the above < 1 >, wherein the opening portion is formed so as to be accommodated within a width of the joint portion in the lateral direction of the article.

＜3＞

In the absorbent article according to < 1 > or < 2 >, the width (W1) of the opening part is preferably 95% or less, more preferably 90% or less, still more preferably 20% or more, and even more preferably 30% or more of the total width (W) of the joint part.

＜4＞

The absorbent article according to any one of the above < 1 > to < 3 >, wherein the joint portion has joint regions on both sides of the opening portion in the article transverse direction.

＜5＞

In the absorbent article according to the above < 4 >, the lengths (La, Lb) of the joining regions on both sides of the hole portion in the transverse direction of the article are preferably 2.5% or more, more preferably 5% or more, and still more preferably 47.5% or less, more preferably 45% or less of the total width (W) of the joining region having the hole portion.

＜6＞

The absorbent article according to the above < 4 > or < 5 >, wherein the joint portion has a joint region also above and below the opening portion in the longitudinal direction of the article, and the opening portion is surrounded by the joint region over the entire circumference.

＜7＞

In the absorbent article according to < 6 >, the lengths (Lc, Ld) in the longitudinal direction of the article in the joined regions above and below the opening portions are preferably 1% or more, more preferably 5% or more, and further preferably 25% or less, and even more preferably 20% or less of the length L1 in the longitudinal direction X of the article in the joined portions, respectively.

＜8＞

The absorbent article according to any one of the above < 1 > -7 >, wherein a plurality of elastic members are disposed between the outer layer sheet and the inner layer sheet in the stretchable part, and the plurality of elastic members are disposed in the transverse direction of the article by the joining parts adjacent to each other in the longitudinal direction of the article.

＜9＞

The absorbent article according to any one of the above < 1 > to < 8 >, wherein the stretchable portion includes a waist stretchable portion,

in the waist stretch unit, a plurality of elastic members are disposed between the pair of outer fixing regions, and these elastic members are fixed between the outer sheet and the inner sheet in each of the pair of outer fixing regions, but are not fixed to either of the outer sheet and the inner sheet between the outer fixing regions.

＜10＞

The absorbent article according to any one of the above < 1 > to < 9 >, wherein the stretchable portion includes a lower waistline stretchable portion,

in the lumbar lower stretch unit, a plurality of elastic members are arranged between the outer fastening region and the main body side fastening region, the elastic members are fastened between the outer layer sheet and the inner layer sheet in each of the outer fastening region and the main body side fastening region, and the elastic members are not fastened to either of the outer layer sheet and the inner layer sheet between the outer fastening region and the main body side fastening region.

＜11＞

The absorbent article according to any one of the above < 1 > - < 10 >, wherein the pitch (P) in the transverse direction of the article in the row of joined portions is preferably 3mm or more, more preferably 4mm or more, further preferably 5mm or more, further preferably 7mm or more, further preferably 15mm or less, more preferably 13mm or less, further preferably 10mm or less, further preferably 3mm or more and 15mm or less, more preferably 5mm or more and 15mm or less, further preferably 7mm or more and 13mm or less.

＜12＞

The absorbent article according to any one of the above < 1 > -11 >, wherein the length of the opening portion in the article transverse direction is preferably 40% or less, more preferably 30% or less, of the pitch (P) of the joint line in the article transverse direction.

＜13＞

The absorbent article according to any one of the above < 1 > to < 12 >, wherein the joint portion has a shape that is long in the article longitudinal direction X.

＜14＞

The absorbent article according to any one of the above < 1 > - < 13 >, wherein a ratio (L1/W) of a length (L1) of the joint in the article longitudinal direction to a total width (W) of the joint is preferably 1.5 or more, more preferably 2 or more, and further preferably 12 or less, more preferably 10 or less.

＜15＞

The absorbent article according to any one of the above < 1 > - < 14 >, wherein the perforated portion is preferably longer in the article longitudinal direction X by the length Lm than in the article lateral direction Y by the length W1, more preferably longer in the article longitudinal direction and has a ratio (Lm/W1) of the length Lm in the article longitudinal direction X to the length W1 in the article lateral direction Y of 1.5 or more, more preferably 2 or more, and further preferably 12 or less, more preferably 10 or less.

＜16＞

The absorbent article according to any one of the above < 1 > -15 >, wherein the length (Lm) of the opening part in the longitudinal direction of the article is preferably 50% or more, more preferably 70% or more, further preferably 100% or less, further preferably 95% or less, further preferably 50% or more and 100% or less, further preferably 70% or more and 95% or less of the length (L1) of the joint part in the longitudinal direction of the article.

＜17＞

The absorbent article according to any one of the above < 1 > to < 16 >, wherein the outer layer sheet or the inner layer sheet includes a stretchable nonwoven fabric.

＜18＞

The absorbent article according to any one of the above < 1 > to < 17 >, wherein the joint portion where the opening portion is formed and the joint portion where the opening portion is not formed are regularly formed.

＜19＞

The absorbent article according to any one of the above < 1 > -18 >, wherein the ratio of the joint portion in which the opening portion is formed is 10% or more of the total joint portion formed in the front side portion or the back side portion in which the joint portion is provided.

＜20＞

The absorbent article according to any one of the above < 1 > -19 >, wherein the ratio of the joint portions in which the opening portions are formed among the total number of the joint portions formed in the front side portion or the back side portion is 10% or more, preferably 30% or more, and more preferably 50% or less.

＜21＞

An absorbent article according to any one of the above items < 1 > to < 20 >, wherein the absorbent article has an outer cover and an absorbent body fixed to the outer cover, and is a pants-type absorbent article in which the stretchable section is formed on the outer cover, and wherein the sheet constituting the outer layer sheet in each of the front and back side sections is folded along the peripheral edge of the waist opening section toward the skin contact surface side of the inner layer sheet, and the folded section is joined to the inner layer sheet and/or the skin contact surface of the absorbent body with an adhesive applied entirely or partially, but is not welded at the joined section.

＜22＞

The absorbent article according to any one of the above < 1 > to < 21 >, wherein the absorbent article is a pants-type absorbent article having an outer body and an absorbent main body fixed to the outer body, the outer body being formed with the stretchable portion,

the opening portion penetrates through the two sheets joined to form the hollow portion, and penetrates through the entire exterior body in the thickness direction.

＜23＞

the opening portion penetrates through the two sheets joined to form the hollow portion, but the through hole is covered with the other sheet and does not penetrate through the exterior body.

＜24＞

The absorbent article according to any one of the above < 1 > -23 >, wherein the waist stretch units have all the joint units arranged at substantially the same position in the longitudinal direction of the article.

＜25＞

The absorbent article according to any one of the above < 1 > - < 24 >, wherein the joint portion has joint regions on both sides of the opening portion in the article transverse direction and on the upper and lower sides in the article longitudinal direction, and a total length (Lc + Ld) of the joint regions located above and below the opening portion in the article longitudinal direction is equal to or smaller than a total length (La + Lb) of the joint regions located on both sides of the opening portion in the article transverse direction.

＜26＞

In the absorbent article according to < 25 >, the total length (Lc + Ld) is preferably 120% or less, more preferably 110% or less, further preferably 100% or less, and further preferably 5% or more, more preferably 10% or more, further preferably 20% or more of the total length (La + Lb).

＜27＞

The absorbent article according to any one of the above < 1 > -26 >, wherein the joint portions constituting the joint line are arranged in the article transverse direction, and a space (L2) between adjacent joint portions in the article transverse direction Y is wider than a total width (W) of the joint portions.

＜28＞

The absorbent article according to any one of the above < 1 > -27 >, wherein the joint portions constituting the joint line are arranged in the article transverse direction, and a ratio (L2/W) of an interval (L2) between adjacent joint portions in the article transverse direction Y to a total width (W) of the joint portions is 2 or more, preferably 2 or more and 10 or less.

＜29＞

The absorbent article according to any one of the above < 1 > - < 28 >, wherein the joint portions constituting the joint line are arranged in the article transverse direction, and the interval (L2) between the joint portions adjacent to each other in the article transverse direction Y is preferably 4mm or more, more preferably 6mm or more, further preferably 14mm or less, more preferably 12mm or less, and further preferably 4mm or more and 14mm or less, more preferably 6mm or more and 12mm or less.

＜30＞

The absorbent article according to any one of the above items < 1 > to < 29 >, wherein the absorbent article is a pants-type absorbent article having an outer casing and an absorbent body fixed to the outer casing, the stretchable portion is formed on the outer casing, and the outer casing on the front side portion and the outer casing on the back side portion are joined to each other at a pair of side seals,

when the article side region of the exterior body on the front side portion or the article side region of the exterior body on the back side portion is divided into a side closer to the absorbent main body and a side closer to the side seal portion so as to halve the article lateral length, the joint portion having the opening portion is formed more on the side closer to the side seal portion.

＜31＞

An absorbent article according to any one of the above items < 1 > to < 30 >, wherein the absorbent article is a pants-type absorbent article having a belly-side sheet member, a back-side sheet member, and an absorbent chassis that spans a central portion of the belly-side sheet member in a lateral direction of the article and a central portion of the back-side sheet member in the lateral direction of the article, and the belly-side sheet member and the back-side sheet member are joined to each other at a pair of side seals,

when the article side region of the front side sheet member or the article side region of the back side sheet member is divided into the side closer to the absorbent main body and the side closer to the side seal so as to halve the article transverse length, the joint portion having the opening portion is formed more on the side closer to the side seal.

＜32＞

The absorbent article according to any one of the above < 30 > or < 31 >, wherein a joint portion having an opening portion is formed on a side closer to the side seal portion, and a joint portion having an opening portion is not formed on a side closer to the absorbent main body.

Industrial applicability of the invention

The absorbent article of the present invention does not cause stuffiness and is excellent in touch and softness.

Claims

1. An absorbent article having a stomach-side portion disposed on a stomach-side of a wearer, a back-side portion disposed on a back-side of the wearer, and a crotch portion located between the stomach-side portion and the back-side portion, the absorbent article characterized in that:

the stretchable part has an outer sheet disposed on a side farther from the skin of a wearer and an inner sheet disposed on a side closer to the skin of the wearer than the outer sheet, the outer sheet and the inner sheet are joined at a joint part, the joint part is disposed in a manner of being separated and dispersed in a manner of forming a plurality of rows in a transverse direction of the article along a joint part row in a longitudinal direction of the article, at least one of the outer sheet and the inner sheet between adjacent joint part rows is deformed in a protruding manner in a thickness direction of the stretchable part so that a hollow part is formed between the outer sheet and the inner sheet, and an opening part is formed in the joint part so as to be overlapped with the joint part wholly or partially,

the stretchable and contractible portion includes a plurality of engaging portions arranged in transverse rows along the transverse direction of the article, the transverse rows having a plurality of engaging portions are formed in a plurality of rows spaced apart in the longitudinal direction of the article,

a plurality of elastic members disposed between the outer layer sheet and the inner layer sheet in the stretchable part, the plurality of elastic members being disposed in the article transverse direction at a space between the rows of transverse joint parts adjacent to each other in the article longitudinal direction,

all or a part of the plurality of rows of the transverse joint portions are arranged such that the joint portions formed with the opening portions are formed in a row in the article transverse direction,

the engaging portion having the opening portion and the opening portion have a shape elongated in the article longitudinal direction,

the ratio of the number of the joint portions in which the opening portion is formed in all of the joint portions of the stretchable portion of the front side portion or the back side portion is 10% or more and 50% or less.

2. The absorbent article of claim 1, wherein:

the opening portion is formed so as to be accommodated within a width of the engaging portion in the article transverse direction.

3. The absorbent article according to claim 1 or 2, characterized in that:

the width of the opening portion is 20% to 95% of the total width (W) of the joint portion.

4. The absorbent article of claim 3, wherein:

the width of the opening portion is 30% to 90% of the total width (W) of the joint portion.

5. The absorbent article of claim 1, wherein:

the engaging portion has engaging regions on both sides of the opening portion in the article transverse direction.

6. The absorbent article of claim 5, wherein:

the length of the joining regions on both sides of the opening portion in the article transverse direction is 2.5% to 47.5% of the total width of the joining portion having the opening portion.

7. The absorbent article of claim 6, wherein:

the length of the joining regions on both sides of the opening portion in the article transverse direction is 5% to 45% of the total width of the joining portion having the opening portion.

8. The absorbent article according to any one of claims 5 to 7, wherein:

the joining portion also has joining regions above and below the opening portion in the article longitudinal direction, and the opening portion is surrounded by the joining regions over the entire circumference.

9. The absorbent article of claim 8, wherein:

the lengths in the longitudinal direction of the article of the joining regions above and below the opening portion are each 1% to 20% of the length (L1) in the longitudinal direction of the article of the joining portion.

10. The absorbent article according to claim 1 or 2, characterized in that:

the telescopic part is provided with a waist telescopic part,

in the waist portion elastic section, a plurality of waist portion elastic section elastic members are arranged between the pair of outer side fixing regions, and the waist portion elastic members are fixed between the outer layer sheet and the inner layer sheet in each of the pair of outer side fixing regions, and are not fixed to either of the outer layer sheet and the inner layer sheet between the outer side fixing regions.

11. The absorbent article according to claim 1 or 2, characterized in that:

the telescopic part is provided with a waist lower part telescopic part,

in the waist lower stretchable panel, a plurality of waist lower stretchable panel elastic members are arranged between the outer side fixing region and the main body side fixing region, and the waist lower stretchable panel elastic members are fixed between the outer layer sheet and the inner layer sheet in each of the outer side fixing region and the main body side fixing region, and are not fixed to any one of the outer layer sheet and the inner layer sheet between the outer side fixing region and the main body side fixing region.

12. The absorbent article according to claim 1 or 2, characterized in that:

the pitch (P) of the joint row in the article transverse direction is 3mm to 15 mm.

13. The absorbent article according to claim 1 or 2, characterized in that:

the length of the opening portion in the article transverse direction is 40% or less of the pitch (P) of the engaging portion row in the article transverse direction.

14. The absorbent article according to claim 1 or 2, characterized in that:

the ratio (L1/W) of the article longitudinal length (L1) of the joint to the total width (W) of the joint is 1.5-12.

15. The absorbent article according to claim 1 or 2, characterized in that:

the length (Lm) of the perforated part in the longitudinal direction of the article is longer than the length (W1) of the perforated part in the transverse direction of the article.

16. The absorbent article according to claim 1 or 2, characterized in that:

the length (Lm) of the perforated portion in the longitudinal direction of the article is 50% to 100% of the length (L1) of the engaging portion in the longitudinal direction of the article.

17. The absorbent article according to claim 1 or 2, characterized in that:

the outer layer sheet or the inner layer sheet includes a stretchable nonwoven fabric.

18. The absorbent article according to claim 1 or 2, characterized in that:

the joint portion where the opening portion is formed and the joint portion where the opening portion is not formed are regularly formed.

19. The absorbent article according to claim 1 or 2, characterized in that:

the absorbent article is a pants-type absorbent article having an outer body and an absorbent body fixed to the outer body, the outer body being formed with the stretchable section,

the sheet constituting the outer layer sheet in each of the front and back side portions is folded along the peripheral edge portion of the waist opening portion toward the skin contact surface side of the inner layer sheet, and the folded portion is joined to the skin contact surface of the inner layer sheet and/or the absorbent main body by an adhesive applied entirely or partially, but is not welded at the joined portion.

20. The absorbent article according to claim 1 or 2, characterized in that:

the perforated portion penetrates the outer layer sheet and the inner layer sheet joined to each other so as to form a hollow portion, and penetrates the entire exterior body in the thickness direction.

21. The absorbent article according to claim 1 or 2, characterized in that:

the perforated portion penetrates the outer layer sheet and the inner layer sheet joined to each other so as to form a hollow portion, but the through hole is covered with another sheet and does not penetrate the outer package.

22. The absorbent article of claim 10, wherein:

in the waist stretch units, the positions of the joint portions in the longitudinal direction of the article are substantially the same for all the joint portion rows.

23. The absorbent article according to claim 1 or 2, characterized in that:

the joining portion has joining regions on both sides of the opening portion in the article transverse direction and on the upper and lower sides of the article longitudinal direction, and a total length (Lc + Ld) of the joining regions located on the upper and lower sides of the opening portion in the article longitudinal direction is equal to or smaller than a total length (La + Lb) of the joining regions located on both sides of the opening portion in the article transverse direction.

24. The absorbent article of claim 23, wherein:

the total length (Lc + Ld) in the longitudinal direction of the article is 5% or more and 100% or less of the total length (La + Lb) in the transverse direction of the article.

25. The absorbent article according to claim 1 or 2, characterized in that:

the joint portions constituting the joint portion row are arranged in the article transverse direction, and the interval (L2) between the joint portions adjacent in the article transverse direction is wider than the total width (W) of the joint portions.

26. The absorbent article according to claim 1 or 2, characterized in that:

the joint sections constituting the joint section row are arranged in the article transverse direction, and the ratio (L2/W) of the interval (L2) between adjacent joint sections in the article transverse direction to the total width (W) of the joint sections is 2 to 10.

27. The absorbent article according to claim 1 or 2, characterized in that:

the joint portions constituting the joint portion row are arranged in the article transverse direction, and the interval (L2) between the joint portions adjacent in the article transverse direction is 6mm to 12 mm.