Method and apparatus for injection molding foamed resin products having a smooth finish on their surface
US4201742A · kind A · utility
50Cited by
13References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1978 |
| Grant date | May 6, 1980 |
| Priority date | — |
| Expiry date | Feb 13, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/812
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention substantially improves the surface finish on resin filled foamed molded plastic products manufactured by injection molding by pre-heating the skin surface of that part of the mold in contact with the part prior to the injection cycle of the machine and then subsequently chilling the mold via internal tube connections to shorten the time needed in the manufacturing cycle for solidifying the part sufficiently for release from the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.