Injection molding system with gas flow through valve gate
US4917594A · kind A · utility
41Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1989 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Aug 28, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/2862
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A valve gated injection molding system for making hollow plastic products. A fixed pin extends through an elongated hollow valve member which is reciprocated between a retracted open position and a forward closed position in which the forward end of the valve member is seated in the gate. The fixed pin has a hollow portion for the flow of pressurized gas to a porous portion at the forward end which is centrally located in the gate. In the open position, gas from the fixed pin flows into the hollow center of a stream of melt which flows into the cavity around the forward end of the fixed pin to form a melt bubble in the cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.