Method of making apertured film fabrics
US5207962A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Jun 25, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D28/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apertured thermoplastic fabric is formed by extruding a molten thermoplastic polymer film having a secant modulus of no greater than 50,000 psi, embossing the film in a nip provided between a smooth surfaced roll and a patterned roll, wherein the patterned roll includes a plurality of discrete, raised projections disposed in a pattern and each of which includes a sharp distal end; applying sufficient pressure at the nip of the patterned and smooth surfaced rolls for causing a plurality of small apertures to be formed in the extruded film in substantially the same pattern as the pattern of discrete, raised projections; orienting the apertured film in both the cross-machine direction and in the machine-direction, and thereafter embossing the oriented film on at least one surface with a plurality of raised members spaced closer to each other than the spaces between the apertures in the oriented film, to thereby provide a matte-type finish on at least one surface. The formed fabric also forms a part of the present invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.