Extrusion of tubes of fiber-reinforced thermoplastics

Details Extrusion of tubes of fiber-reinforced thermoplastics Extrusion of tubes of fiber-reinforced thermoplastics

1992-03-09

1994-05-03

Thurlow, Jeffery

Pipes and tubular conduits

Reinforced

With embedded element

264108, 2642092, 2642098, 425 97, 425107, 425380, 425467, 428 369, F16L 1108

Patent

active

053078438

ABSTRACT:
Fibre-reinforced tubes made of a thermoplastics material are manufactured using a method of extruding thermoplastics material in a drawplate with a diverging end zone, the end zone of which has a diverging annular flow space which has a ratio A.sub.s /A.sub.e between the exit area and entry area of at least 1.2, and a ratio between the length 1 of the lower edge of the annular exit space of the diverging zone and the width e of the straight section of said annular space which is less than 5; the extrusion operation being carried out in the presence of a liquid lubricant which is incompatible with said thermoplastics material at extrusion temperatures, said lubricant being present at the level of the external wall and at the level of the internal wall of said flow space. Tubes which are manufactured by way of this method are particularly resistant to a high degree of bursting and have an improved surface quality.

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Soviet Inventions Illustrated, Section Ch, Week 9125, 7 Aoot 1991 Derwent Pub. Ltd., London, GB; Class A, AN 91-183765/25.

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