Method for press molding thermoplastic resin
US5130075A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1991 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Sep 25, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/563
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A molded article of a thermoplastic resin having good appearance is molded with a pair of molds having a conduit for supplying a resin melt in one of the molds by closing the molds till a mold cavity clearance in a closing direction reaches a specific distance, opening the molds at a specific rate while starting supply of the resin melt into the mold cavity before the clearance reaches the thickness of the finally produced article, continuing opening of the molds while supplying the resin melt till the cavity clearance becomes larger than the thickness of the finally produced article, and closing the molds at a specific rate before or when resin supply is finished to mold and cool the supplied resin melt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.