Method of forming two material three/five layer preform

Details Method of forming two material three/five layer preform Method of forming two material three/five layer preform

1989-11-15

1991-07-16

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264513, 425130, B29C 4516

Patent

active

050323415

ABSTRACT:
A plastic preform from which a plastic container is blow molded. The preform replaces a three layer preform by providing a preform which is of a five layer construction in the base forming portion thereof and wherein a secondary material which forms the core layer of the three layer preform construction is divided into an inner intermediate layer and an outer intermediate layer by a third injection of material. The third injected material is preferably the same material as the primary material which is first injected. This results in the reduction of the cost of the preform and also provides remaining in the injection nozzle a quantity of the last injected material which is the same as the first injected material for the following preform in the same preform injection mold cavity.

REFERENCES:
patent: 4459257 (1984-07-01), Baciu
patent: 4550043 (1985-10-01), Beck
patent: 4808101 (1989-02-01), Schad et al.

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