Process for preparing thermoinsulating and/or structural double-walled molded bodies
US5308557A · kind A · utility
4Cited by
12References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1992 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Jun 26, 2012 |
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 includes 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.