Process for continuously producing foamed sheets
US4213925A · kind A · utility
11Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1978 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Aug 14, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/053
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plastic foamed sheet of excellent quality is produced by preheating in a chamber including a conveyor means for continuously conveying a thermoplastic resin sheet containing a heat-decomposable blowing agent in the horizontally supported state and a heating means for heating the sheet to a temperature lower than the decomposition temperature of the blowing agent, and foaming in a foaming chamber connected to the preheating chamber and including a heating means for heat-foaming the sheet as it is continuously conveyed while being perpendicularly suspended from the terminal of the conveyor means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.