Method of molding rigid foamed polyurethane articles
US3970732A · kind A · utility
46Cited by
12References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1973 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Sep 26, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/812
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for molding plastic materials, particularly foamed plastic materials, in which the materials are introduced into a mold cavity together with a foaming agent with the mold cavity being evacuated not later than immediately after the molding material is supplied thereto. The reduced pressure in the mold cavity causes the material to foam extremely quickly so as completely to fill the cavity while, at the same time, the mold is held closed by the pressure differential between the inside and outside thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.