Process for fabricating bodies of polymeric material with foamed core
US5811039A · kind A · utility
4Cited by
13References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1994 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Jul 6, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process is presented for fabricating composite bodies of thermoplastic material including a foamed core bonded to a compatible thermoplastic sheet. A sheet of thermoplastic material is first preheated and then thermoformed on a first half-mould. The first half-mould with the thermoformed sheet is positioned opposite a second half-mould to form a hollow chamber therebetween. A foamable thermoplastic material containing one or more liquid hydrocarbons is injected into the hollow space at a temperature sufficiently high to permit the foamable material to expand and bond to the thermoformed sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.