# US 2012/0071309 A1 · Method of manufacturing a top sheet or back sheet of a disposable absorbent article

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- Number: US 2012/0071309 A1
- Document ID: US20120071309A1
- Status: Published application
- Kind: A1
- Application number: 13/375,694
- Filed: 2009-06-04
- Published: 2012-03-22
- Earliest claimed: 2009-06-04
- Assignees: SCA Hygiene Products AB
- Inventors: Lucas Bäck; Ulrika Carlson
- Web page: https://patentgrep.com/patent/US20120071309A1

## CPC

- A61F 13/15723: {Partitioning batts; Cutting}
- A61F 13/15699: {Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs}
- Y10T 156/1015: Folding
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of manufacturing a top sheet material or back sheet material for use in the manufacture of disposable absorbent articles, including the steps of: a) splitting a continuous first web of sheet material having substantially straight side edges into a second and third continuous web by an alternating concave-convex cutting line cut in a longitudinal direction along the continuous first web, the cutting line being distanced from both side edges of the continuous first web; b) shifting the second continuous web in a lateral direction in relation to the third continuous web so that the substantially straight edges of the second and third continuous webs are parallel to and adjacent to each other and longitudinally shifting the second continuous web so that the series of concave edge portions and the series of convex edge portions of the second and third continuous webs are longitudinally aligned with each other: c) directly or indirectly joining the substantially straight edges of the second and third continuous webs to each other, thereby forming a composite fourth web. The cutting line is made in the first continuous web so that all portions of the cutting line are distanced from a longitudinal centre line of the first continuous web.

## Claims

### Claim 1

A method of manufacturing a top sheet material or back sheet material for use in the manufacture of disposable absorbent articles comprising the steps of:
a) splitting a continuous first web of sheet material having substantially straight side edges into a second and third continuous web by an alternating concave-convex cutting line cut in a longitudinal direction along said continuous first web, said cutting line being distanced from both side edges of said continuous first web;
b) shifting the second continuous web in a lateral direction in relation to the third continuous web so that the substantially straight edges of the second and third continuous webs are parallel to and adjacent to each other and longitudinally shifting the second continuous web so that the series of concave edge portions and the series of convex edge portions of the second and third continuous webs are longitudinally aligned with each other;
c) directly or indirectly joining the straight edges of the second and third continuous webs to each other, thereby forming a composite fourth web,
wherein the cutting line is made in said first continuous so that all portions of said cutting line are distanced from a longitudinal centre line of said first continuous web.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said cutting line is formed by a series of a straight line an outwardly inclined line a straight line an inwardly inclined line.

### Claim 3 (depends on 1)

The method according to claim 1, wherein said first continuous web is made of top sheet material.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the straight edges of the second and third webs are overlapping each other after the shifting of the second web.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the straight edges of the second and third webs lie edge-to-edge after shifting of the second web.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the straight edges of the second and third webs are distanced from each other or lie edge-to-edge after shifting of the second web and are indirectly joined to each other by a splicing strip.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the splicing strip forms part of a standing gather.

### Claim 8 (depends on 1)

The method according to claim 1, wherein a standing gather is attached to the composite fourth web along the joining line between the second and third webs.

### Claim 9 (depends on 3)

The method according to claim 3, wherein the longitudinal centre line of the alternating concave-convex cutting line is distanced from the longitudinal centre line of the first web by 40-120 mm, when a top sheet material for an adult diaper is manufactured and by 40-80 mm, when a top sheet material for a baby diaper is manufactured.