Apparatus for the manufacture of thin-walled shaped articles of

Details Apparatus for the manufacture of thin-walled shaped articles of Apparatus for the manufacture of thin-walled shaped articles of

1976-08-25

1978-08-08

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

With means to gather excess or rejected stock material

Dynamic gatherer

4253241, 4253261, 425327, 425378R, 425367, 4253871, 425DIG201, B29C 2900

Patent

active

041053869

ABSTRACT:
Thin-walled articles of thermoplastic material are formed in a continuous apparatus starting with heating and extruding granular thermoplastic raw material in the form of a continuous web which is immediately stabilized by rapid cooling of its opposite surfaces and the stabilized web wherein the material sandwiched between the precooled outer surface layers remains at or near extrusion temperature is fed into a thermal forming station wherein shaping tools form the articles in the web without the need for further heating of the web. Adjustments are provided for correlating the cooling action to different materials and web feed rates, for varying the web feed rates and increments, and for varying the shaping tool movements to adapt for different materials and sizes of articles. After the formed articles are separated from the web the web residue is fed back to be mixed with incoming raw material at the extrusion station.

REFERENCES:
patent: 2541203 (1951-02-01), Canfield
patent: 3161915 (1964-12-01), Thiel
patent: 3333032 (1967-07-01), Dickinson
patent: 3335927 (1967-08-01), Zwiebel
patent: 3454693 (1969-07-01), Crenshaw
patent: 3667885 (1972-06-01), Shelby
patent: 3733160 (1973-05-01), Neil
patent: 3830611 (1974-08-01), Irwin
patent: 3904338 (1975-09-01), Straumanis

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