Method of injection-molding thermoplastic resins
US5902534A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 5, 1995 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Sep 5, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C37/0028
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of injection-molding a thermoplastic resin, which involves the steps of PA1 (a) injecting a molten resin of a thermoplastic resin into a cavity provided in a mold composed of a fixed mold member and a movable mold member, PA1 (b) introducing a predetermined amount of a coating material into between the resin in the cavity and the cavity wall after the injection of the molten resin is completed, to allow the resin in the cavity to be compressed with the introduced coating material and/or to allow the movable mold member to move in the mold-opening direction, and PA1 (c) maintaining a molding pressure before the mold releasing at a level higher than 0 kgf/cm.sup.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.