Apparatus for injecting plastics and elastomers

Details Apparatus for injecting plastics and elastomers Apparatus for injecting plastics and elastomers

1981-05-28

1983-12-27

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With accumulator, trap chamber, or serially arranged valves...

366 76, 366 78, 425586, B29F 100

Patent

active

044228422

ABSTRACT:
An injection apparatus for plastics materials containing glass reinforcing fibers includes a fixed sheath 5, a movable sheath 7 slidably disposed within the fixed sheath, a mixing screw 9 rotatable within the movable sheath, a pressurized supply hopper or funnel 8 for feeding material to the mixing and conveying screw, and a piston/cylinder unit 14-16 for advancing the movable sheath and screw to inject a charge of plastics material within a chamber 26 to a mold M. The supply funnel is coupled to the movable sheath and includes a compression plate 35 controlled by a jack 38 mounted on a sliding plate 39, whereby the compression plate may be retracted into abutment with the sliding plate and laterally withdrawn to enable the reloading of the supply funnel. The mixing screw may be slightly retracted from the movable sheath to form a passage 25 for the plastics material to minimize the shearing of the fibers therein during mixing and conveyance, and the entire apparatus may be separated from the mold by a jack V to avoid undesired thermal transfers between the mold and the injection material.

REFERENCES:
patent: 2881477 (1959-04-01), Triulzi
patent: 3021561 (1962-02-01), Reifenhauser
patent: 3698845 (1972-10-01), Paulson
patent: 3706827 (1972-12-01), Nott et al.
patent: 4043728 (1977-08-01), Holly

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