JP2008043444A - Absorbent article and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which is equipped with a leakage-proof wall excellent in leakage-proofness and dispenses with another member. <P>SOLUTION: This absorbent article comprises: a pair of first leakage-proof walls which contain a liquid-permeable top sheet, a liquid-impermeable back sheet and a core superposed between the top sheet and the back sheet, and are provided at both the side edges of the core, respectively; and a pair of second leakage-proof walls which are provided outside the first leakage-proof walls. At least two folded portions are provided along the longitudinal direction of both the side edges of the cover sheet which is provided on the skin non-abutting surface side of the back sheet, so that the first leakage-proof wall can be formed on a width-direction inside and so that the second leakage-proof wall can be formed on a width-direction outside. Since both edges of the back sheet are held in a sandwiched state by the folded portions of the first leakage-proof walls, the absorbent article has the excellent leakage-proofness and dispenses with another member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an absorbent article and a method for producing the same.

Regarding the absorbent article, which is an absorbent article that enhances the leak-proof property of the flap and suppresses the leakage of excrement, articles disclosed in Patent Documents 1 and 2 below are known.
Patent Document 1 discloses a disposable diaper that is improved in leakproofness by connecting a composite sheet made of a water-impermeable sheet and a nonwoven fabric, which are separate members, to both side edges of the barrier sheet.
Patent Document 2 discloses a disposable diaper that is provided with an inner cuff that holds a back sheet made of a liquid-impermeable material and that has a pocket for accommodating an elastic member at an edge portion, thereby improving leakage resistance. ing.

JP-A-7-213555 Special table hei 9-504977

However, in patent document 1, in order to connect a composite sheet, it is necessary to form the composite sheet which consists of a water-impermeable sheet and a nonwoven fabric which are members different from a top sheet and a barrier sheet. That is, in order to form a composite sheet of different members, it is necessary to separately prepare the material raw material, and it is necessary to supply and process these materials separately in the manufacturing process, which is complicated. Furthermore, since a water-impermeable sheet which is a separate member from the barrier sheet is used, there is a possibility that side leakage may occur from a gap generated between the barrier sheet and the water-impermeable sheet.
Further, in Patent Document 2, since the front sheet forms the inner cuff and extends to the outside, the absorbed liquid may travel along the front sheet and diffuse to the outside of the inner cuff, resulting in absorption. There is a problem of leaking liquid. Furthermore, Patent Document 2 does not disclose any manufacturing method.

Therefore, the present invention is a leak-proof wall that functions as a so-called three-dimensional cuff or inner cuff, is excellent in leak-proof properties, and is a simplified absorbent article that does not require a separate fabric for forming. And it aims at providing the manufacturing method.

In order to solve the above problems, the present invention includes a liquid-permeable top sheet, a liquid-impervious back sheet, and a core laminated between the top sheet and the back sheet. An absorbent article comprising a pair of first leakage prevention walls provided and a pair of second leakage prevention walls provided outside the first leakage prevention wall, on the non-skin contact surface side of the back sheet A cover sheet is further provided, and by providing at least two bent portions along the longitudinal direction at both side edges of the cover sheet, a first leak-proof wall is formed on the inner side in the width direction and a second leak-proof wall is formed on the outer side in the width direction. The absorbent article is characterized in that both side edges of the back sheet are held by the bent portion of the first leak-proof wall.

The present invention also provides a liquid-permeable top sheet, a liquid-impervious back sheet, a core laminated between the top sheet and the back sheet, and a cover sheet laminated on the non-skin contact surface side of the back sheet. And a pair of first leak-proof walls provided on both sides of the core, and a pair of second leak-proof walls provided on the outside of the first leak-proof wall. A step of bending the side edges of the cover sheet that is continuously conveyed along the longitudinal direction, holding the side edges of the back sheet, and forming a pair of first bent portions that serve as first leakage barriers; A step of bending the cover sheet to be conveyed along the longitudinal direction inside the pair of first bent portions in the width direction to form a pair of second bent portions serving as a second leak-proof wall. A method for manufacturing an absorbent article is provided.

According to the present invention, since the leak-proof wall is formed by bending the cover sheet, a separate member for the leak-proof wall is not required. Moreover, the both-sides edge part of a liquid-impermeable back seat | sheet is clamped by the bending part of the 1st leak-proof wall. At this time, the back sheet is continuous from the lower part of the core to the both side edges, and no gap is generated, so that the leakage prevention property of the leakage prevention wall can be improved.

In addition, according to the present invention, by forming the first leak-proof wall and the second leak-proof wall by bending the cover sheet, there is no need to separately supply and process another member for the leak-proof wall, The manufacturing process can be simplified.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In addition, the width direction of the absorbent article 1 indicates the SD direction, and the longitudinal direction indicates the direction toward the back with respect to the paper surface or the LD direction in FIG.

FIG. 1 is a schematic sectional view showing a first embodiment of an absorbent article 1 according to the present invention.
The absorbent article 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 4, and a core 3 laminated between the top sheet 2 and the back sheet 4. A cover sheet 5 is provided on the skin contact surface side.

The liquid-permeable top sheet 2 only needs to be a material that allows liquid to pass through the core 3, and more preferably has a good texture. Such a liquid-permeable top sheet 2 may be a woven fabric, a non-woven fabric such as spunbond or melt blown, a porous film, and one or two or more of these materials bonded together.

The liquid-impermeable back sheet 4 may be a material that does not allow liquid to pass, and may be a thermoplastic resin film or the like. Moreover, if the back sheet 4 is liquid-impermeable, what is moisture-permeable is more preferable.

The core 3 may be a layer composed mainly of defibrated pulp, an airlaid nonwoven fabric, or the like, and more preferably used in combination with a polymer water-absorbing polymer.

The cover sheet 5 preferably has a good texture, and may be a woven fabric, a non-woven fabric such as spunbond or melt blown, a porous film, and one or two or more of these materials bonded together.

The absorbent article 1 includes a pair of first leakage prevention walls 6 on both sides in the width direction of the core and a second leakage prevention wall 7 provided outside the first leakage prevention wall 6. Here, the first leak-proof wall 6 is formed by providing first bent portions 8 along the longitudinal direction at both side edges of the cover sheet 5 as described later, and the second leak-proof wall 7 is formed by the cover sheet 5. It is formed by providing the 2nd bending part 9 along a longitudinal direction in a both-sides edge part.

Furthermore, the absorbent article 1 has both side edges 4 e of the liquid-impermeable back sheet 4 sandwiched inside the first bent portion 8 provided on the cover sheet 5. As a result, the leakage preventing property of the first leakage barrier 6 is improved by the sandwiched both side edges 4e, and the side leakage of excrement can be effectively prevented.

At this time, if the material of the cover sheet 5 is hydrophilic, side leakage can be more effectively prevented by performing water-repellent treatment on at least a part of the portion forming the first leak-proof wall 6. Furthermore, if the material of the cover sheet 5 is hydrophobic, side leakage can be prevented more effectively.

Moreover, since the 1st leak-proof wall 6 and the 2nd leak-proof wall 7 are integrally formed by bending the cover sheet 5, the absorbent article 1 does not require another member for a leak-proof wall.

FIG. 2 is a schematic sectional view showing a second embodiment of the absorbent article 1 according to the present invention, and FIG. 3 is a partial perspective view showing the second embodiment. In the figure, the same reference numerals as those in the first embodiment indicate the same configuration, and the description thereof is omitted.
In the present embodiment, the first elastic member 10 is disposed in an expanded state inside the first bent portion 8 that forms the first leak-proof wall 6, and the second bent portion 9 that forms the second leak-proof wall 7. Inwardly, the second elastic member 11 is arranged in an extended state.

If it is the said absorbent article 1, since the 1st leak-proof wall can stand up to predetermined | prescribed height with the contraction force of the 1st elastic member 10, it can prevent the side leakage of excrement more effectively. it can.
In addition, the contraction force of the second elastic member 11 improves the fit around the legs, so that side leakage of excrement can be prevented very effectively.

Note that only one of the first elastic member and the second elastic member may be provided. Further, the number of elastic members may be one or a plurality, and any elastic members such as thread rubber, flat rubber, elastic hot melt, elastic film, etc. may be used. Good.

Next, the manufacturing method of the absorbent article 1 according to the second embodiment will be described.
In FIG. 4, the process of forming the continuous 2nd bending part 19 is shown. FIG. 5 shows a stacking step and a step of forming the continuous first bent portion 18.
4 and 5 are schematic cross-sectional views in the width direction orthogonal to the longitudinal direction of the manufacturing process.

Fig.4 (a) shows the cross section of the width direction of the continuous cover sheet 15 conveyed along a longitudinal direction. As shown in FIG. 4B, at the predetermined position on the right side in the width direction of the continuous cover sheet 15, the right continuous second elastic member 21R is arranged and fixed along the longitudinal direction in the stretched state.

At this time, the right continuous second elastic member 21R may be fixed by an adhesive, or may be fixed by a known joining means such as a heat seal or a sonic seal.

Next, the right side edge is folded inward (FIG. 4 (c)) so that the right continuous second elastic member 21R is held by the continuous cover sheet 15, and then the right side edge is folded back again. A continuous second bent portion 19R to be the second leakage preventing wall 7 is formed (FIG. 4D).

Further, with respect to the center line CL, the left continuous second elastic member 21L is disposed along the longitudinal direction in the stretched state at the location where the right continuous second elastic member 21R is disposed and the target location, and is similarly fixed. (FIG. 4D).
Then, the left side edge is bent inward (FIG. 4 (e)), and the left side edge is folded back again to form a second continuous bent part 19L that becomes the other second leak-proof wall 7 (FIG. 4). 4 (f)).

With respect to the continuous cover sheet 15 in which the continuous second bent part 19 is formed by the process shown in FIG. A pair of continuous first elastic members 20 (20R and 20L) are respectively disposed and fixed at the positions (FIG. 5A).
Note that the pair of continuous first elastic members 20 may be disposed and fixed to the liquid-impervious continuous backsheet 14 described later, instead of the continuous cover sheet 15.
The pair of continuous first elastic members 20 may be fixed by an adhesive similarly to the continuous second elastic member 21 or may be fixed by a known joining means such as a heat seal or a sonic seal.

Next, the liquid-impermeable continuous backsheet 14 is supplied in the longitudinal direction and laminated on the continuous cover sheet 15 (FIG. 5B). Here, the continuous backsheet 14 may be laminated so that the side edge portions 14e cover the continuous first elastic member 20, or may be laminated without being covered.

Thereafter, the left and right extending portions 22R and 22L of the continuous cover sheet 15 are bent inward in the width direction (FIG. 5B), and the continuous first bent portions 18 (18R and 18L) are formed.
At this time, by making the width of the continuous back sheet 14 narrower than the width of the continuous cover sheet 15 and wider than the distance between the pair of continuous second elastic members 19, the continuous first elastic members 20 and A continuous composite sheet 23 in which both side edge portions 14e of the continuous back sheet 14 are held is formed (FIG. 5C).

And the core 13 is arrange | positioned in the center of the width direction of the continuous composite sheet 23, and the liquid-permeable continuous top sheet 12 conveyed along a longitudinal direction is laminated | stacked so that the core 13 may be pinched | interposed with the continuous composite sheet 23, and it joins. As a result, the continuous laminate 24 is formed.
Here, the bonding between the layers may be performed using any means as long as it is a known bonding means such as an adhesive, embossing, heat sealing, and sonic sealing.

The continuous top sheet 12 and the core 13 may be laminated at the stage of FIG. 5B before the continuous composite sheet 23 is formed. After the lamination, the left and right extending portions 22R of the continuous cover sheet 15 are provided. 22L may be bent inward in the width direction.

FIG. 6 shows a folding process of the continuous first bent portion 18 and the continuous second bent portion 19.
The continuous laminated body 24 is constructed such that the continuous first bent portion 18 and the continuous second bent portion 19 are bent along the base end portion BP, so that the continuous first bent portion 18 stands on both sides of the core 13 and The two bent portions 19 extend outward in the width direction.

Thereafter, the continuous laminated body 24 is cut into individual absorbent articles 1 by being cut in the width direction at predetermined intervals in the longitudinal direction.
Simultaneously with the cutting, or before and after the cutting, both end portions EP in the longitudinal direction of the first bent portion 8 serving as the first leakage prevention wall 6 may be joined to the surface of the absorbent article 1 as shown in FIG. By joining both end portions EP, the first leak-proof wall 6 in the substantially central region in the longitudinal direction forms a pocket-shaped space.
In addition, as long as the said joining is well-known joining means, such as an adhesive agent, embossing, a heat seal, a sonic seal, you may join using any means.

In addition, the continuous laminate 24 may be cut into individual absorbent articles 1 before being bent along the base end portion BP. At this time, due to the contraction force of the first elastic member 10, the first bent portion 8 rises at the base end portion BP on both sides of the core 3, and the first leakage prevention wall 6 is formed. Further, the second bent portion 9 follows the standing operation of the first bent portion 8 and is displaced so as to extend outward in the width direction, whereby the second leakage preventing wall 7 is formed.

As a result, the side edges 4e of the liquid-impermeable back sheet 4 are held inside the first bent portion 8 of the cover sheet 5. At this time, the back sheet is continuous from the lower side of the core to the side edge portions, and no gap is generated. The 1st leak-proof wall 6 formed by standing up of the 1st bending part 8 is excellent in leak-proof property, and can prevent the side leakage of excrement effectively.

Further, by bending the cover sheet 5, the first leak-proof wall 6 and the second leak-proof wall 7 can be integrally formed, and a separate member for the leak-proof wall is not required.

FIG. 7 shows another example of the step of forming the continuous second bent portion 19.
The continuous cover sheet 15 shown in FIG. 7A is held by the central conveyance pad 25C and the two-side conveyance pads 25R and 25L, and is conveyed in the longitudinal direction.
Here, the transport pad 25 has holding means (not shown) such as a suction hole, a pin, and a presser.

Here, the both-side transport pads 25R and 25L are arranged with a space having a predetermined width from the central transport pad 25C. Then, the second continuous elastic member 21 is disposed and fixed in a stretched state at a position that is symmetrical with respect to the center line CL at a portion facing the space of the continuous cover sheet 15 (FIG. 7B). )).

Both-side conveyance pads 25R and 25L convey the continuous cover sheet 15 and move toward the center in the width direction. Thereby, slack occurs in the portion facing the space so that the continuous second elastic member 21 is held by the continuous cover sheet 15 (FIGS. 7C and 7D).
In addition, the movement of the both-side conveyance pad 25 may be performed by any conveyance means such as a belt conveyor or a drum, and any mechanism such as a cam mechanism or a link mechanism may be used as the movement mechanism.

When the transport pads 25R and 25L on both sides further move and the continuous second elastic member 21 is held by the continuous cover sheet 15, the right continuous second bent portion 19R is formed between the central transport pad 25C and the right transport pad 25R. The left continuous second bent portion 19L is formed between the central transport pad 25C and the left transport pad 25L (FIG. 7E).

The continuous cover sheet 15 in which the continuous second bent portion 19 is formed by the process shown in FIG. 7 is conveyed to the process shown in FIGS. 5 and 6 to form the absorbent article 1.

FIG. 8 is an exploded perspective view of an example in which the absorbent article 1 according to the present invention is applied to a worn article. The outer layer sheet 26 has a front part 26F and a back part 26B, and the absorbent article 1 according to the present invention is disposed at substantially the center in the width direction.
The worn article may be a pants type or a tape type. Further, the front part 26F and the back part 26B may be formed of different members, respectively, and the absorbent article 1 may be disposed so as to straddle between the front part 26F and the back part 26B.

The absorbent article according to the present invention can be applied to infants or incontinence wearing articles, sanitary napkins and the like.

Schematic sectional view showing an embodiment of an absorbent article according to the present invention Schematic sectional view showing another embodiment of the absorbent article according to the present invention Partial perspective view showing another embodiment Schematic sectional view showing the process of forming a bent portion of another embodiment Schematic sectional view showing the lamination process of another embodiment Schematic sectional view showing the state of the absorbent article after cutting Schematic cross-sectional view showing another example of the step of forming the bent portion The exploded perspective view of the example which applied the absorptive article concerning the present invention to the wearing article

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 3 Core 4 Back sheet 5 Cover sheet 6 1st leak-proof wall 7 2nd leak-proof wall 8 1st bending part 9 2nd bending part 10 1st elastic member 11 2nd elastic member 12 Continuous top Sheet 13 Core 14 Continuous back sheet 15 Continuous cover sheet 18 Continuous first bent portion 19 Continuous second bent portion 20 Continuous first elastic member 21 Continuous second elastic member 22 Extending portion 23 Continuous composite sheet 24 Continuous laminate 25 Conveying pad 26 Outer layer sheet CL Center line BP Base end EP Longitudinal end

Claims (7)

A core comprising: a liquid-permeable top sheet; a liquid-impermeable back sheet; a core laminated between the top sheet and the back sheet; and a cover sheet laminated on the non-skin contact surface side of the back sheet. An absorbent article comprising a pair of first leakage barriers provided on both sides of the first and a pair of second leakage barriers provided outside the first leakage barrier,
By providing each pair of the first bent portion and the second bent portion along the longitudinal direction on both side edges of the cover sheet, a first leak-proof wall and a second leak-proof wall are formed,
An absorbent article, characterized in that both side edges of the backsheet are held by the first bent part of the first leak-proof wall.
The absorbent article according to claim 1, wherein a first elastic member is further sandwiched between first bent portions forming the first leak-proof wall.
The absorbent article according to claim 1 or 2, wherein a second elastic member is further sandwiched by the second bent portion forming the second leak-proof wall.
A core comprising: a liquid-permeable top sheet; a liquid-impermeable back sheet; a core laminated between the top sheet and the back sheet; and a cover sheet laminated on the non-skin contact surface side of the back sheet. A method for producing an absorbent article comprising a pair of first leakage barrier walls provided on both sides of the first leakage prevention wall and a pair of second leakage prevention walls provided on the outside of the first leakage prevention wall,
Bending both side edges of the transported cover sheet along the longitudinal direction, sandwiching both side edges of the back sheet, and forming a pair of first bent parts serving as first leakage barriers;
A step of bending the cover sheet to be conveyed along the longitudinal direction on the inner side in the width direction of the pair of first bent portions to form a pair of second bent portions serving as a second leak-proof wall;
A method for producing an absorbent article, comprising:
The method of manufacturing an absorbent article according to claim 4, further comprising a step of displacing the pair of first bent portions inward in the width direction with respect to the pair of second bent portions.
The manufacturing method of the absorbent article of Claim 4 thru | or 5 which further includes the process of conveying a 1st elastic member continuously, and arrange | positioning it in the position used as the said 1st bending part.
The manufacturing method of the absorbent article of Claim 4 thru | or 6 which further includes the process of conveying a 2nd elastic member continuously, and arrange | positioning in the position used as the said 2nd bending part.

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