Method for gas assisted injection molding with pin and sleeve mechanism
US5302339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Jun 23, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/1735
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for injecting a viscous fluid and a non-viscous fluid into a mold cavity of a mold body includes the step of regulating a flow of viscous fluid through a nozzle body discharge end and into a mold cavity with a valve element. The valve element is mounted for reciprocation in a nozzle body flow passage and includes a barrel having a first end, which selectively engages a portion of the nozzle body discharge end to prevent a flow of viscous fluid therepast, and a second end. A bore extends longitudinally through the barrel and a pin is positioned in the bore. A non-viscous fluid flow passage is defined between the pin and the barrel wherein the non-viscous fluid flow passage is annular in shape and has a substantially constant diameter at and adjacent the barrel first end. A viscous fluid flows through the nozzle body flow passage around the barrel and into the mold cavity. A non-viscous fluid flows through the non-viscous fluid flow passage around the pin and into the mold cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.