Film, laminated sheet and methods of making same
US6811643B2 · kind B2 · utility
60Cited by
24References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2003 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Feb 24, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2305/30
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of making a microporous laminate sheet having a first film layer and a second layer. The first film layer includes a pore initiator and is bonded to the second layer in order to form a laminate sheet. The laminate sheet is then stretched using at least one CD intermeshing stretcher and at least one MDO stretching unit. Methods of making a microporous film is well as a microporous film laminate are also provided, along with an apparatus for stretching a film or laminate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.