Injection molding process
US7754134B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Nov 8, 2007 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Apr 30, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/575
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to an injection molding process that improves recovery limited productivity. The present invention advantageously applies pressurized fluid within the nozzle of an injection molding machine to improve the machine's productivity. In accordance with one aspect of the invention, an existing or new injection molding machine is outfitted with a pressurized fluid system at the nozzle between the plasticizer barrel and the melt manifold. The use of a specialized nozzle and isolation valve allows the pressurized fluid to displace material within the nozzle and runner, ensuring the proper pressure is applied to the plastic resin within the mold during pack and hold while the plasticizing screw can begin its recovery cycle. Finally, the pressurized fluid can be evacuated from the nozzle melt stream area either via the fluid entrance or a fluid pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.