Method for making a preform consisting of at least three layers

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece

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Details

264322, 264323, 264512, 264515, B29C 3108, B29C 4320, B29C 4706, B29C 5710

Patent

active

047190698

ABSTRACT:
A method and an apparatus for making blow-moulded bottle from a preform consisting of at least three layers. For making the preform a tube section heated at one end is shaped by pushing into a closed bottom mould to form a bottom and pressure is exerted in the axial direction on the center bottom region to close the still present gaps in an outer layer as soon as an inner layer has flowed together.

REFERENCES:
patent: 3832437 (1974-08-01), Taylor
patent: 3929943 (1975-12-01), Klimaszewski, Jr.
patent: 4219525 (1980-08-01), Greenspan
patent: 4424182 (1984-01-01), Cerny

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