Pultrusion process
US5084222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1989 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Jun 20, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C70/521
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the process for manufacturing thermoplastic polymer articles reinforced with long continuous fibers by pultrusion, including impregnating tufts of fibers with thermoplastic resin, circulating an assemblage of said impregnated tufts in a heat assembly so as to melt the resin, and then hot shaping the article in an appropriate die to give it essentially its final shape before passing it through a second cooling die, the improvement including compressing the assemblage of impregnated tufts in the heated assembly consisting essentially of a flat die having an inlet zone and an exit zone, the inlet being wide enough to allow the initial volume of the impregnated tufts to pass through and a horizontal gap adapted to be varied in thickness, and allowing the emerging assembly of impregnated tufts to be brought to the shape of a sheet of minmimium thickness before shaping, and the flat die and rigid polyvinyl chloride article prepared by the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.