Process for molding a substantially isotropic isocyanate-based polymer foam bun
US4104346A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1976 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Jul 29, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/84
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mold is described for the molding of substantially isotropic isocyanate-based polymer foam buns. The mold is a box mold which has sidewalls of which at least one pair disposed in parallel relationship is adapted to move outwardly when subjected to pressure exerted by the expanding foam during the molding operation. The outward movement of the sidewalls is controlled by stops provided on the periphery of the mold floor, said sidewalls being free to slide over the surface of the floor. The lid of the mold is supported in sliding engagement with the upper edges of the sidewalls. The mold and the process of fabricating foam buns therewith is particularly suitable for use in situations (e.g. operation in the field) in which it is not possible or practicable to employ continuous bunstock machines. The mold is relatively inexpensive and readily dismantled for transportation to a fabrication site.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.