Method of molding a mechanically frothed urethane resin foam and an open-top injection mold therefore
US4412962A · kind A · utility
9Cited by
12References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1982 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Aug 30, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/83
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improved mold structure and method of molding for mechanically frothed urethane foams is presented. The mold is filled from the bottom via an annular runner which communicates with the mold cavity. The connection between the annular runner and the mold cavity is restricted to create a back pressure in the circumferential runner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.