Extrusion molding process
US7090791B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2002 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7178
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A molding process is disclosed in which an extruded column of plastic is introduced into a mold cavity having a predetermined surface profile. A region of negative air pressure is created inside the mold cavity, exterior to the extruded column. The negative air pressure is applied to the exterior of the extruded column to draw the extruded column into contact with the entire surface profile of the mold cavity, to produce a molded article. The invention can also include a step of co-extruding multiple types of plastic resulting in an extruded column having multiple layers, to produce a molded article having multiple layers. The present method also includes a step of internally inserting a component into the extruded column at a predetermined position so that it will end up at a predetermined position of the molded article after the molding process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.