Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1989-07-13
1990-08-07
Seidleck, James
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
138118, 2642092, 428220, F16L 1100, D01D 524
Patent
active
049463713
ABSTRACT:
Disclosed is a method and apparatus for producing a flexible tube of a thermoplastic resin having poor melt flowability, the tube having an intrinsic viscosity of at least 3.5 dl/g, a tensile strength at break of 150 kg/cm.sup.2, a breaking time at hot internal pressure creep of at least 200 hours, an outer diameter of 50 mm.phi. or less, and a ratio of the outer diameter to the wall thickness of 40 or less.
This tube can be prepared from a thermoplastic resin having poor melt flowability by melting the thermoplastic resin having poor melt flowability in a screw extruder, and melt-extruding the molten thermoplastic resin from a tube die having an L/D of at least 5 provided at a mandrel rotatable with the rotation of the screw.
REFERENCES:
patent: 3500870 (1970-03-01), Ely, Jr. et al.
patent: 4100827 (1978-07-01), Flemming
patent: 4314958 (1982-02-01), Macleod et al.
patent: 4430282 (1984-02-01), Stack
patent: 4478898 (1984-10-01), Kato
patent: 4518552 (1985-05-01), Matsuo et al.
patent: 4655769 (1987-04-01), Zachariades
Shiraki Takeshi
Yoshimura Yoshihiro
Mitsui Petrochemical Industries Ltd.
Seidleck James
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