Apparatus and method for forming hollow parisons of variable wal

Details Apparatus and method for forming hollow parisons of variable wal Apparatus and method for forming hollow parisons of variable wal

1990-01-10

1991-10-15

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264167, 2642092, 264313, 425 3, 425381, 425532, 425465, 425466, B29C 4722

Patent

active

050572679

ABSTRACT:
A parison forming device is disclosed for forming hollow polymer extrudes of variable wall thickness in either the circumferential or longitudinal directions, or in any combination thereof. The parison forming device consists of a die-head assembly and mandrel assembly, concentrically arranged, creating an annual opening. The inner or outer circumferential perimeter of the annular opening may be selectively modified at specific radial locations through radially displaceable slides positioned about the annular opening. The slides, attached to either the die-head assembly or mandrel assembly, may be actuated during parison formation via hydraulic or other methods so as to provide suitable wall thickness profiles for later finished polymer products.

REFERENCES:
patent: 3209404 (1965-10-01), Hagen
patent: 3346918 (1967-10-01), Deleuze et al.
patent: 4124351 (1978-11-01), Garbuio
patent: 4171195 (1979-10-01), Klein et al.
patent: 4382766 (1983-05-01), Feuerherm
patent: 4432718 (1984-02-01), Wurzer

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