Heat-resistant foamed polyester articles and process for their manufacture
US8205417B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2007 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Feb 5, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B47/10
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process for thermoforming a foamed polyester sheet of low crystallinity to produce a heat-resistant molded foam article (13). The process comprises the steps of heating a foamed polyester sheet (10) to a preforming temperature by contact with at least one heating plate and molding the heated foamed polyester sheet onto a non-heated mold (30). The present invention further relates to a process for manufacturing a package by thermoforming a foamed polyester sheet of low crystallinity to produce a heat-resistant molded foam container, loading a product (51) into said container and sealing or welding a film of thermoplastic material (61) onto said container to close it.The heat-resistant molded foam articles and the packages thus obtained are excellent in heat resistance and are not thermally distorted even when heated in a microwave or conventional oven. They are particularly useful for the packaging of food products for dual ovenable applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.