Hot runner system for coinjection molding
US6062840A · kind A · utility
53Cited by
27References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1997 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Sep 2, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/2725
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A coinjection molding system for injecting skin and core material into a mold cavity. The system includes a three position actuator for moving a valve pin into a closed position in which neither skin nor core flow is permitted, a middle position in which only skin flow is permitted, and an open position in which skin and core flow is permitted. The actuator includes a first piston slidably mounted in an actuator housing, and a second piston, attached to the valve pin, slidably mounted within the first piston. A shut-off is provided in the manifold for preventing skin flow to a particular nozzle during sequential gating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.