Apparatus for making chips of thermoplastic material

Details Apparatus for making chips of thermoplastic material Apparatus for making chips of thermoplastic material

1975-12-10

1978-01-31

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425311, 425382R, 425464, B29F 304

Patent

active

040713075

ABSTRACT:
A die for extruding filaments from molten plastic material such as polyethylene or polypropylene is heated until steady extrusion conditions are reached. The direct heating is then stopped, so that the die is only partially heated from the molten material while it is extruded. The extruded filaments are sheared by a blade interacting with the die. The resulting chips are cool enough for flowing to an outflow hopper without sticking to one another or to the blade. Sticking is further prevented by maintaining a strong cooling air stream within the hopper and around the blade and by making the extrusion holes in the die diverge at their output ends and by arranging them near the periphery of the die for maximum mutual distance.

REFERENCES:
patent: 2914005 (1959-11-01), Gorozpe
patent: 3177820 (1965-04-01), Pazar et al.
patent: 3304578 (1967-02-01), Clute
patent: 3415917 (1968-12-01), Watanabe et al.
patent: 3564650 (1971-02-01), Irving
patent: 3578740 (1971-05-01), Redding et al.
patent: 3727308 (1973-04-01), Ross

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