Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Coating or impregnating workpiece before molding or shaping...
Patent
1989-06-20
1992-01-28
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Coating or impregnating workpiece before molding or shaping...
264171, 264257, 264294, 156180, B29C 4322
Patent
active
050842226
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.
REFERENCES:
patent: 3529050 (1970-09-01), Smith
patent: 4154634 (1979-05-01), Shobert
patent: 4168194 (1979-09-01), Stiles
patent: 4252696 (1981-02-01), McQuarrie
patent: 4296060 (1981-10-01), Killmeyer
patent: 4394338 (1983-07-01), Fuwa
patent: 4445957 (1984-05-01), Harvey
patent: 4588538 (1986-05-01), Chung
Causier Alain
Glemet Michel
Gourdon Bernard
Atochem
Durkin II Jeremiah F.
Woo Jay H.
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