Molding machine for injection foaming
US7150615B2 · kind B2 · utility
20Cited by
13References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2004 |
| Grant date | Dec 19, 2006 |
| Priority date | — |
| Expiry date | Sep 15, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D35/148
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for injection-foaming a thermoplastic resin by using an injection molding machine with a two-stage-compression screw, injecting a physical foaming agent into the cylinder of the machine at a pressure lower than the storage pressure of the physical foaming agent, mixing it with a melted resin and expanding the volume of the cavity of the mold at the time of injection, and an injection molding machine and resin composition suitable therefore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.