Molding process utilizing a mold release membrane
US4956141A · kind A · utility
43Cited by
2References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1989 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Apr 7, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C33/68
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Molded plastic articles are prepared by disposing a mold release membrane across a mold section, closing the mold, injecting polymeric precursor materials behind the membrane causing it to conform and adhere to the mold cavity surface, and thereafter parting the mold sections and parting the molded plastic article away from the release membrane which remains adhered to the mold cavity surface. Subsequent injections may be used to prepare additional molded plastic articles, thereby reusing the release membrane which at all times remains adhered to the mold cavity surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.