Blow-extruding a multilayer synthetic-resin tube

Details Blow-extruding a multilayer synthetic-resin tube Blow-extruding a multilayer synthetic-resin tube

1989-06-08

1990-09-11

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4253261, 4253871, B29C 5528

Patent

active

049558021

ABSTRACT:
An apparatus for blow extruding a synthetic-resin tube has a nozzle having an annular mouth generally centered on a longitudinal axis for longitudinally outwardly extruding a tubular synthetic-resin strand, an inner stabilizing tube extending longitudinally outward from the nozzle within the mouth thereof and having an outer end spaced a predetermined longitudinal distance from the mouth, and an outer stabilizing tube surrounding the inner tube and defining a longitudinal passage therewith, extending longitudinally outward from the nozzle within the mouth thereof, and having an outer end lying between the outer end of the inner tube and the mouth. The passage opens outward between the outer ends. Cool air is fed to the passage at the mouth and to a space defined between the strand where it emerges from the mouth and the outer tube for flow of this cooling air longitudinally outward between the strand and the outer tube and from the outer end of the outer tube. Thus the strand is expanded transversely generally at the outer ends of the tubes. The cooling air is withdrawn from within the strand by drawing this cooling air into the outer end of the inner tube and longitudinally backward through the inner tube.

REFERENCES:
patent: 2966700 (1961-01-01), Dyer et al.
patent: 3902832 (1975-09-01), Gregory et al.
patent: 4105380 (1978-08-01), Zimmermann
patent: 4601649 (1986-07-01), Upmeier
patent: 4624823 (1986-11-01), Audureau et al.
patent: 4643657 (1987-02-01), Achelpohl et al.
patent: 4678417 (1987-07-01), Upmeier

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