Injection molding apparatus
US3937447A · kind A · utility
14Cited by
5References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1973 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Sep 7, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S366/601
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention is concerned with an injection molding apparatus in which thermoplastic material mixed with an expanding agent is kept in a plastic state below the reaction temperature of the agent and is passed generally continuously through an inter-connecting passage to a transfer cylinder; by flowing through the passage, the mass is heated above the reaction temperature and the built-up pressure prevents foaming of the thermoplastic until it is injected into a mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.