Apparatus and method for feeding a powdery material to a plastic

Details Apparatus and method for feeding a powdery material to a plastic Apparatus and method for feeding a powdery material to a plastic

1975-01-14

1976-10-12

Feldman, Peter

Plastic article or earthenware shaping or treating: apparatus

Projection

259 25, 425203, A21C 106, B29B 110, B29H 110

Patent

active

039853489

ABSTRACT:
Means and method are provided for feeding through a feed port, to a plasticized polymer mass, a powdery material which contains entrapped air. An extruder is used having an entrance for feeding the polymer, and having a rotating worm, transporting the polymer from its entrance to a polymer exit; means are provided forming an entrance port for the powdery material downstream of the polymer entrance, and positive vent means are provided in the housing upstream of the powdery material entrance but downstream of the polymer entrance for drawing out the air, to prevent entrapped air or volatiles from fouling the powder feed port.

REFERENCES:
patent: 2633074 (1953-03-01), Davis
patent: 3114930 (1963-12-01), Oldham et al.
patent: 3183553 (1965-05-01), Slater

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