Evacuation system for injection molding machines
US4573900A · kind A · utility
13Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1984 |
| Grant date | Mar 4, 1986 |
| Priority date | — |
| Expiry date | Dec 6, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/34
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus is disclosed for controlling operating pressure within a mold cavity of an injection molding die. Finely detailed, and parts having thin walls are molded with the invention providing a process for eliminating defects. There is a pressure control apparatus which is preset to provide varying degrees of negative and positive pressure during the mold cycle, and to reset to repeat the procedure for subsequent cycles. The procedure includes a cleaning stage for preparing the mold cavity for the following mold cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.