Method and apparatus for forming a multi-layer preform

Details Method and apparatus for forming a multi-layer preform Method and apparatus for forming a multi-layer preform

1995-10-13

1997-11-18

Loney, Donald

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 3691, 428167, 428213, 4285428, 425500, 425522, 425525, 425532, 264513, 264515, 264537, 264539, 215 122, B29D 2200, A21C 300, B29C 3902

Patent

active

056885709

ABSTRACT:
A preform mold assembly for the injection molding of a multi-layer preform for use in the blow molding of container. The preform mold assembly comprises a preform mold having a gate for receiving molten plastic material. The preform mold has a cavity with longitudinal axis and defines an inner surface. A core-pin is situated within the cavity and spaced from said inner surface. A preform cavity is formed between the inner surface of the cavity and the core-pin for receiving molten plastic from the gate. A threadsplit portion is situated within the cavity at a location remote from said gate. The inner surface of the cavity defines a plurality of flutes formed generally parallel to the cavity longitudinal axis and extend longitudinally along the inner surface of the mold to the threadsplit portion.

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