Method of manufacture of foamed thermo-plastic extruded shapes
US4049760A · kind A · utility
22Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1976 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Mar 31, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/17
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a method of manufacture of profile-sections of any shape, including complex shapes, of structural foamed thermo-plastic material, having a density of between 0.4 and 0.9 with respect to the corresponding bulk or solid thermo-plastic material, the said method consisting in slowing-down and/or stopping the expansion at the immediate outlet of a conventional extrusion machine, at predetermined zones by blowing or spraying, in a differential manner at the periphery of the extruded product, a fluid at a temperature lower than the softening temperature of the said thermo-plastic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.