Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Noninterengaged fiber-containing paper-free web or sheet...
Patent
1986-10-30
1990-08-21
Woo, Jay H.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Noninterengaged fiber-containing paper-free web or sheet...
428285, 428300, 264257, 264258, 264325, 264327, 264DIG65, B29C 4302, B29C 6714
Patent
active
049505327
ABSTRACT:
Fiber reinforced thermoplastic parts having good surface characteristics are produced by a process involving: preheating fiber reinforced composite to achieve at least a flowable viscosity of the polymer, and (2) molding under controlled rheological conditions. The preheating is conducted on composites that are predominantly amorphous thermoplastic polymers, copolymers, polyblends or alloys reinforced with continuous glass fiber strand reinforcing mat. The amount of the mat present in the laminate is less than around 40 weight percent of the composite. The temperature of preheating is at least greater than the glass transition temperature of the polymer and less than the degradation temperature of the polymer to expand the composite. The preheated composites are compression molded in an effective charge and at a pressure of at least around 500 to 6,000 psi, where at least one die surface of the mold is maintained at a temperature in the range of the glass transition temperature of the polymer to a temperature of 70.degree. F. (39.degree. C.) below the glass transition temperature of the polymer.
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Azdel Reinforced Thermoplastic Moldable Sheet brochure.
Das Balbhadra
Raghupathi Narasimhan
Thimons Thomas V.
Azdel, Inc.
Durkin II Jeremiah F.
Stachel Kenneth J.
Woo Jay H.
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