Method for rotational moulding of a workpiece comprising a thermoplastic foam layer
US7785506B2 · kind B2 · utility
0Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2003 |
| Grant date | Aug 31, 2010 |
| Priority date | — |
| Expiry date | Jan 28, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C41/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A foam layer is formed by rotomoulding including heating a foaming polymer, and wherein the heating is interrupted before the foaming temperature is reached. A thermal inertia of the system also composed of the mold and previously placed layers assures completion of heating, but not sufficient to cause disorderly foaming. The foam layer is uniform and bonding. Dense layers surrounding the foam layer may be different.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.