Extrusion die for two-ply plastic tubing

Details Extrusion die for two-ply plastic tubing Extrusion die for two-ply plastic tubing

1986-01-15

1988-09-13

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4251331, 425224, 4253261, 425378R, 425369, 4253871, 425388, 425392, 425393, 425 3, 425529, 425532, B29C 4706

Patent

active

047706180

ABSTRACT:
An extrusion die for two-ply seamless plastic tubing, includes an extrusion head with a first nozzle provided with a first centering means; a first hollow mandrel placed within said nozzle; an elongate carrier bearing a second mandrel, a second nozzle and a spider in turn supporting a distributor splitting an extrudate. The first nozzle and the distributor define a first annular extrusion orifice for an outer parison of the tubing while the second nozzle and the second mandrel define a second annular extrusion orifice for the inner parison of the tubing. A threaded member longitudinally adjusts said carrier to vary the size of the first extrusion orifice. A coupling means interconnects the carrier and the first mandrel and allows only the axial, without rotation, movement of the carrier. A second centering means mounts the distributor uniformly spaced around the spider.

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