Method and device for extrusion of a double wall plastics pipe

Details Method and device for extrusion of a double wall plastics pipe Method and device for extrusion of a double wall plastics pipe

1988-12-12

1990-06-12

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

264514, 264515, 264167, 264173, 264245, 4251311, 4251331, 425190, 425192R, 4253261, 4253871, 425462, 425467, B29C 4704

Patent

active

049331345

ABSTRACT:
Method in extruding a double-walled plastic tube by using plastic materials of different colors for the inner layer and the outer layer, a portion of the material for the inner layer being diverted to form a longitudinal strip of the outer layer on the outside surface of the tube. The invention also relates to an extrusion tool for working the method, wherein an element (21) is provided inside the tool to divert material from a passage (19) for material for the inner layer to a passage (16) for material for the outer layer.

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