Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1975-03-18
1976-04-13
Annear, R. Spencer
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
425388, 425DIG40, B29D 720
Patent
active
039501213
ABSTRACT:
The invention is a drive mechanism for a rotary vacuum forming multifaced drum to essentially match the surface speed of said drum to the constant speed of a web of film issuing from a film die. The instant invention provides apparatus to continuously vary the rotational speed of a multifaced vacuum forming drum with any number of faces, such that if a web of hot film were extruded at a constant rate, the rotational speed of the drum would vary as required to accept the film at a constant rate to provide an essentially uniform thickness of material on the surface of the drum for thermoforming.
REFERENCES:
patent: 3323274 (1967-06-01), Justus
patent: 3421964 (1969-01-01), Arbit
patent: 3518725 (1970-07-01), Donofrio
Annear R. Spencer
Hercules Incorporated
Peterson James W.
Rosenbaum Mark
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