Valve to valve melt transfer device
US6955534B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 2003 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Apr 2, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/322
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A stack or tandem injection molding apparatus includes a first melt transfer nozzle coupled to a stationary platen and a second melt transfer nozzle coupled to a movable platen. A melt transfer device includes a first valve pin extending through a first melt transfer channel of the first melt transfer nozzle and a second valve pin extending through a second melt transfer channel of the second melt transfer nozzle. At least one groove is provided in the outer surface of the first valve pin. The first valve pin is movable relative to the first and second melt transfer nozzles to selectively locate the groove across a portion of the first melt transfer channel and a portion of the second melt transfer channel to allow melt to flow therebetween in the mold closed position and to prevent drooling in the mold open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.