Stretchable structure with striped adhesive, method for producing, and absorbent article comprising the stretchable structure

Patent metadata

Field	Value
Publication number	US-10492958-B2
Application number	US-201515124482-A
Country	US
Kind code	B2
Filing date	Mar 20, 2015
Priority date	Mar 31, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

The present invention provides an underpants-type disposable diaper that has pleats formed in an outer body, which vertically and straightly extend, is excellent in appearance and air permeability, and is excellent in drawing preventing performance of a resilient and elastic member. The above-mentioned object is solved by a method for producing an underpants-type disposable diaper including, in forming stretchable regions, applying an adhesive to both an external surface of an inside layer and an internal surface of an outside layer in the same vertical striped pattern intermittent in an MD direction while transporting the inside layer and the outside layer, and then, fixing resilient and elastic members to the inside layer and the outside layer by bonding the inside layer and the outside layer to each other such that a position of the adhesive on the inside layer in the MD direction and a position of the adhesive on the outside layer in the MD direction are made to match with each other and sandwiching the resilient and elastic members between the inside layer and the outside layer continuously along the MD direction.

First claim

The invention claimed is:

1. A method for producing a stretchable structure of an absorbent article,
the stretchable structure including a plurality of elongated resilient and elastic members provided with spaces left therebetween along an extending direction, and a first layer and a second layer facing one side and the other side of the resilient and elastic members, respectively, wherein
the first layer and the second layer are joined together with an adhesive applied in a striped pattern intermittent in the extending direction so as to form sheet joined sections,
the resilient and elastic members are fixed to the first layer and the second layer with the adhesive at positions intersecting with the sheet joined sections, and
the first layer and the second layer contract with contraction of the resilient and elastic members and portions of the first layer and the second layer between the sheet joined sections swell to directions opposite to each other so as to form pleats, the method comprising:
applying the adhesive to both an external surface of the first layer and an internal surface of the second layer in the same striped pattern intermittent in an MD direction while transporting the first layer and the second layer in the MD direction, and then, fixing the resilient and elastic members to the first layer and the second layer by bonding the first layer and the second layer to each other such that a position of the adhesive on the first layer in the MD direction and a position of the adhesive on the second layer in the MD direction are made to match with each other and sandwiching the resilient and elastic members between the first layer and the second layer continuously along the MD direction,
wherein the position of the adhesive on the first layer in the MD direction and the position of the adhesive on the second layer in the MD direction are made to match with each other by dividing any one of the first layer and the second layer into a plurality of portions at intermediate positions in the CD direction and individually adjusting positions of these divided portions in the MD direction before the first layer and the second layer are bonded to each other.

2. The method for producing the stretchable structure of the absorbent article according to claim 1 , wherein
the first layer and the second layer are a one-side portion and another-side portion of one continuous belt-shaped sheet material, which is transported in the MD direction, relative to an intermediate position in a CD direction, and
the adhesive is applied to both the external surface of the first layer and the internal surface of the second layer in the striped pattern such that the positions of the adhesive in the MD direction are the same, and then, the resilient and elastic members are fixed to the first layer and the second layer with the adhesive by folding back the sheet material in the CD direction to bond the first layer and the second layer to each other and sandwiching the resilient and elastic members between the first layer and the second layer.

3. A method for producing an underpants-type disposable diaper,
the underpants-type disposable diaper including an outer body constituting a front panel and a back panel and an inner body having an absorber and fixed to an internal surface of the outer body, wherein
both side portions of the outer body in the front panel and both side portions of the outer body in the back panel are joined together to form side seal portions, thereby forming a waist opening and a pair of right and left leg openings, and
the outer body in at least one of the front and back panels includes an elongated resilient and elastic member along a width direction, an inside layer and an outside layer facing an inner side and an outer side of the resilient and elastic member, respectively, and sheet joined sections formed by joining the inside layer and the outside layer together with an adhesive applied in a vertical striped pattern intermittent in the width direction, and has stretchable regions in which the resilient and elastic member is fixed between the inside layer and the outside layer with the adhesive in portions intersecting with the sheet joined sections in a state of being extended in the width direction, and
in the stretchable regions, the inside layer and the outside layer contract with contraction of the resilient and elastic member, so that portions of the inside layer and the outside layer, which are located between the sheet joined sections, swell to directions opposite to each other so as to form pleats, the method comprising:
in forming the stretchable regions, applying the adhesive to both an external surface of the inside layer and an internal surface of the outside layer in the same vertical striped pattern intermittent in an MD direction while transporting the inside layer and the outside layer in the MD direction, and then, fixing the resilient and elastic member to the inside layer and the outside layer with the adhesive by bonding the inside layer and the outside layer to each other such that a position of the adhesive on the inside layer in the MD direction and a position of the adhesive on the outside layer in the MD direction are made to match with each other and sandwiching the resilient and elastic member between the inside layer and the outside layer continuously along the MD direction,
wherein the position of the adhesive on the inside layer in the MD direction and the position of the adhesive on the outside layer in the MD direction are made to match with each other by dividing any one of the inside layer and the outside layer into a plurality of portions at intermediate positions in the CD direction and individually adjusting positions of these divided portions in the MD direction before the inside layer and the outside layer are bonded to each other.

4. The method for producing the underpants-type disposable diaper according to claim 3 , wherein
the underpants-type disposable diaper has a non-stretchable region formed in a region for fixing the inner body in the outer body, the stretchable regions are provided at respective sites between the non-stretchable region and the side seal portions at both sides in the width direction, and the inside layer and the outside layer are continuous from the stretchable region at one side in the width direction to the stretchable region at the other side through the non-stretchable region,
in forming the stretchable regions and the non-stretchable region, the adhesive is applied to both the external surface of the inside layer and the internal surface of the outside layer in the same vertical striped pattern intermittent in the MD direction at sites corresponding to the stretchable regions while transporting the inside layer and the outside layer in the MD direction whereas the adhesive is applied to any one of the external surface of the inside layer and the internal surface of the outside layer in the vertical striped pattern continuous from the stretchable regions and the adhesive is not applied to the other of the external surface of the inside layer and the internal surface of the outside layer in the vertical striped pattern at a site corresponding to the non-stretchable region, and then,
the resilient and elastic member is fixed to the inside layer and the outside layer with the adhesive by bonding the inside layer and the outside layer to each other such that the position of the adhesive on the inside layer in the MD direction and the position of the adhesive on the outside layer in the MD direction at the sites corresponding to the stretchable regions are made to match with each other and sandwiching the resilient and elastic member between the inside layer and the outside layer continuously along the MD direction, and subsequently,
the resilient and elastic member

Assignees

• Daio Seishi Kk

Inventors

• Matsui Tomotsugu
• Mori Yosuke
• Seno Shunji
• Fujima Kento

Classifications

• A61F13/15707

  Mechanical treatment, e.g. notching, twisting, compressing, shaping · CPC title

• A61F13/496

  in the form of pants or briefs · CPC title

• B32B2307/728

  Hydrophilic · CPC title

• A61F13/15593 Primary

  having elastic ribbons fixed thereto; Devices for applying the ribbons · CPC title

• A61F13/15739

  Sealing, e.g. involving cutting · CPC title