Process for molding of a foamed article
US4952365A · kind A · utility
14Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1987 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Mar 18, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/83
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for producing a foamable thermoplastic resin article having a relatively thin non-foamed outer shell with a smooth surface and a foamed core portion, which has excellent dimensional stability, by pressurizing a mold cavity under a pressure of gas less than the foaming pressure and not less than the surface smoothing pressure of the foamable resin and permitting the pressure of the gas simultaneously with completion of the injection to be communicated to an atmospheric pressure or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.