Method for imparting elasticity to a non-woven material / elastomer laminate

Patent metadata

Field	Value
Publication number	US-2016229168-A1
Application number	US-201615133816-A
Country	US
Kind code	A1
Filing date	Apr 20, 2016
Priority date	Apr 28, 2006
Publication date	Aug 11, 2016
Grant date	—

Abstract

Method for imparting elasticity to a laminate comprising at least one elastic film having a width and at least one ply of non-woven material secured to the film, particularly through interposition of a bonding material, particularly glue, which comprises the following steps in which:
the laminate is unrolled in the form of a web in order to pass it between two sets of toothing, of which the teeth engage in each other in a direction perpendicular to the plane of the laminate in order to thus stretch the laminate in the direction of its width, characterised in that: a tension is imparted to the web in the longitudinal direction or machine direction during its unrolling between the toothing, particularly by providing a tensioner roll, particularly downstream of the sets of toothing.

First claim

What is claimed is:

1 . A method for manufacturing an elastic laminate having a laminate length in a longitudinal direction (MD) and a laminate width in a transverse direction (CD) and comprising at least one elastomeric film and at least one ply of non-woven material, comprising the steps of:
extruding an elastomeric material on a conveying belt so as to form at least one elastomeric film; conveying said at least one elastomeric film through a cooling unit so as to cool said elastomeric material; securing together said at least one elastomeric film with at least one ply of non-woven material; conveying the resulting composite constituted of the at least one elastomeric film and of said at least one ply of non-woven material into an activation unit so as to stretch said composite in said transverse direction CD to impart elasticity thereto and to obtain said elastic laminate.

2 . The method of claim 1 , comprising the further step of:
securing together said at least one elastomeric film and said at least one ply of non-woven material is done by interposing of a bonding layer.

3 . The method of claim 2 , wherein there is provided two plies of non-woven material and two bonding layers, said bonding layers having a width equal to said laminate width.

4 . The method of claim 2 , wherein said bonding layer is a glue layer.

5 . The method of claim 3 , wherein said bonding layers are glue layers.

6 . The method of claim 1 , wherein said at least one elastomeric film has a width in said transverse direction which is smaller than said laminate width.

7 . The method of claim 2 , wherein said at least one elastomeric film has a width in said transverse direction which is smaller than said laminate width.

8 . The method of claim 4 , wherein said at least one elastomeric film has a width in said transverse direction which is smaller than said laminate width.

9 . The method of claim 6 , wherein there is provided two elastomeric films, and the sum of their respective widths being less than said laminate width.

10 . The method of claim 1 , wherein stretching the composite in the CD direction in the activation unit is done by conveying said composite between two sets of teeth.

11 . The method of claim 1 , wherein said at least one elastomeric film is deposited on said at least one ply of non-woven material in a softened state.

12 . The method of claim 1 , wherein said at least one ply of non-woven material is a mechanically consolidated non-woven material.

13 . The method of claim 1 , wherein the securing together of said at least one elastomeric film and said at least one ply of non-woven material is done while said at least one ply of non-woven is unrolled from a reel.

Assignees

• Aplix Sa

Inventors

• Ducauchuis Jean-Pierre
• Marche Thierry

Classifications

• B32B5/022

  Non-woven fabric · CPC title

• B32B2535/00

  Medical equipment, e.g. bandage, prostheses or catheter · CPC title

• B32B38/0012

  Mechanical treatment, e.g. roughening, deforming, stretching · CPC title

• B32B2555/02

  Diapers or napkins · CPC title

• B29C65/48

  using adhesives {, i.e. using supplementary joining material; solvent bonding} · CPC title