Process for producing an elastic multilayer web of material
US5769993A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1994 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Oct 26, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24446
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Process for producing an elastic multilayer web of material consisting of a flexible elastic backing film made of a thermoplastic elastomer and a web of nonwoven material bonded in a crepe-like manner to both the top and bottom sides of the backing film, whereby the webs of nonwoven material are welded together and the weld bonds are distributed over the web of material in the form of a grid arrangement of spot welding points and at the same time yield areas of increased air permeability through the web of material. The following process steps are carried out: PA1 a) guiding and stretching the backing film to at least (100+a) % of the unstretched length, PA1 b) separately guiding and stretching two webs of nonwove (11 and 12) to certain dimensions (100+b) % and (100+c) % while maintaining the following conditions: PA2 b <c<a, PA1 where the difference in the extent of stretching is great enough to produce a crepe-like appearance of the webs of nonwoven material and they are guided together to form a sandwich arrangement consisting of a backing film in the middle and webs of nonwoven material on the outside, PA1 c) the webs of nonwoven material are welded to the backing film with hel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.