Two material three/five layer preform

Details Two material three/five layer preform Two material three/five layer preform

1988-12-30

1990-09-04

Seidleck, James J.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

215 1C, 215 121, 428 367, 4285428, B65D 100

Patent

active

049543768

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: 4609516 (1986-09-01), Krisnakumar
patent: 4725464 (1988-02-01), Collette
patent: 4728549 (1988-03-01), Shimizu et al.

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