Process for preparing thermoinsulating and/or structural double-walled molded bodies and products thereby obtained
US5387452A · kind A · utility
1Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Dec 22, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/239
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing thermoinsulating and/or structural double-walled molded bodies, which comprises the following steps: PA1 (a) heating two sheets made of thermoplastic polymer to a temperature equal or slightly higher than their softening point; PA1 (b) inserting between the two sheets a pre-mold made of an expanded polymeric material; PA1 (c) thermoforming in a mold the two sheets on the pre-mold; PA1 (d) soldering together the two sheets on their rims by means of a pressure applied on them by the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.