Gas injected compression molding
US6602460B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 30, 2001 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Apr 19, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2043/5053
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for the compression molding of a plastic article is provided. The method includes the steps of loading plastic material, that is preferably unheated, into a two piece molding chamber having at least one heating element, closing the molding chamber, and heating the plastic element. The method further includes the step of injecting fluid, for example air, into the plastic material to create at least one cavity within the plastic material. The air may be injected directly into the plastic material, or it may be injected along an upper surface of the chamber. Upon injection of air into the at least one cavity, a portion of the plastic material is forced to exit the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.