Apparatus for injection molding of multilayer preforms

Details Apparatus for injection molding of multilayer preforms Apparatus for injection molding of multilayer preforms

1990-10-29

1992-03-24

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

425146, 425147, 425159, 425562, B29C 4516

Patent

active

050982745

ABSTRACT:
An apparatus for forming multiple layer preforms wherein the various layers may be varied as to number, material, thickness and position in the preform by controlling the injection of the specific materials as to timing, quantity and rate of delivery. Most specifically, a featured aspect is the ability to simultaneously deliver to an injection nozzle and through such injection nozzle into a preform mold cavity two or more molten plastic materials simultaneously. This is possible by way of a multiple gate nozzle and a plurality of separately operable metering pots all controlled by way of a timing device. The timing device may also control the rate of the dispensing an individual material from each of the metering pots.

REFERENCES:
patent: 4512730 (1985-04-01), Kudert et al.

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