Process and apparatus for producing hollow bodies from thermopla

Details Process and apparatus for producing hollow bodies from thermopla Process and apparatus for producing hollow bodies from thermopla

1987-02-05

1989-05-09

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264296, 264323, 425393, 425398, B29C 5522, B29C 5530

Patent

active

048287830

ABSTRACT:
In the production of hollow bodies from oriented thermoplastic material, a cylindrical portion of a heated hollow preform is stretched, with a simultaneous reduction in the wall thickness thereof, at a starting temperature below the vitreous transition temperature of the material. A mandrel is positioned in the preform to support it during stretching, the outside diameter of the mandrel corresponding to the inside diameter of the preform. Directly before the mandrel is inserted into the preform the preform is subjected to re-alignment to adapt at least the cross-sectional shape of the mouth opening of the preform to the cross-section of the mandrel. The re-aligning operation is effected by inserting the preform into a sleeve adjoining a drawing ring for carrying out the stretching operation.

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