Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1988-12-28
1990-12-11
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642105, 264235, 264346, B29C 4788
Patent
active
049769081
ABSTRACT:
A poly(arylene sulfide) sheet excellent in planarity and smoothness is formed of a composition composed at least principally of a substantially linear, high molecular poly(arylene sulfide) having a melt viscosity of at least 1,000 poises. It has an elongation at break of at least 10% at 23.degree. C. and a Young's modulus of at least 5 kg/mm.sup.2 at 200.degree. C., and per area of 1 cm.times.2 cm on at least one of its surfaces, contains not more than 1 convexity or concavity whose angle of elevation or depression is at least 2.degree. and whose height or depth is at least 10 .mu.m. The sheet is produced by melting the composition, extruding the melt through a slit die, cooling and solidifying the extrudate into a sheet, preheating the sheet for 3-100 seconds in a temperature range of from a temperature 20.degree. C. lower than the glass transition temperature of the polymer to a temperature 25.degree. C. higher than the glass transition temperature, and then causing the thus-preheated sheet to pass between a heating roll heated at a temperature in a range of 120.degree.-200.degree. C. and a pinch roll under a pinch pressure of 0.05-10 kg/cm, whereby the sheet is continuously pressed under linear pressure, is subjected to a heat treatment for 3-100 seconds and is crystallized.
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Mizuno Toshiya
Saito Takeshi
Teramoto Yoshikichi
Wakabayashi Juichi
Kureha Kagaku Kogyo K. K.
Thurlow Jeffery
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