Method for the production of rigid foam sheets
US4755250A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1985 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Dec 10, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1084
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The process and the appropriate apparatus for producing rigid foam elements, in particular of polyurethane, operate with a double-belt unit, in which the rigid foam elements produced are provided with upper and lower cover sheets. A parting agent is applied on the lower cover sheet in a particular region in order to permit subsequent removal of the upper cover sheet and the ridge foam in this region, so that the lower cover sheet projects, and foams an overlapping section during subsequent use as a roofing element or the like. The invention permits a very precise cut to be made by means of the sawing apparatus at the end of the double-belt unit, taking into account the application of parting agent at the beginning and, if necessary, the movement of the sawing apparatus itself. This is carried out in principle by a method in which the position at which the parting agent is applied, and the path covered after this application, are input into a computer, which initiates the specified transverse cut after the section provided with parting agent has reached the transverse cut position. When the sawing apparatus itself is movable relative to the foam strand, an additional signal relating…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.