Process and apparatus for manufacturing foamed structures with integral skin
US4747983A · kind A · utility
16Cited by
9References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1985 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Dec 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/05
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A foamed thermoplastic article having an integral outer unfoamed skin layer is formed from a mixture of thermoplastic resin containing a blowing agent by removing at least a portion of the blowing agent in the die of the extruder. The blowing agent is removed, e.g., by modifying the die so that it incorporates a porous section whcih allows the blowing agent to be removed from the mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.