Method and apparatus for manufacturing compression molded articles from thermoplastic material
US4943405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1989 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Feb 13, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2023/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for manufacturing compression molded articles from a thermoplastic material blank comprising heating the material, and compression molding the blank by means of a die. The material forming the blank is deposited on the surface of an intermediate support which forms a part of the compression molding mold and extends under and is separated from the die. The blank is separated from the die, which may be accomplished using a heated stream of gas surrounding the die and directed at the point of separation. The blank is introduced into the mold which is closed as the intermediate support is lowered, followed by compression molding the blank by the application of compression molding pressure, and cooling the molded article at least partly under pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.