Plastic article or earthenware shaping or treating: apparatus – Preform severing means – Cutter guided by or cooperating with peripheral edge of...
Patent
1976-12-06
1980-12-30
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Preform severing means
Cutter guided by or cooperating with peripheral edge of...
264163, 264321, B29C 1700, B29C 1714
Patent
active
042420741
ABSTRACT:
A thermoplastic material, such as a sheet of polystyrene or polyethylene foam, is placed between a trim guide, which may be a die mold or press, and is in the form of at least two heat-conducting metal pieces, one of which is movable towards the other. The trim guide is pressure-operated to pressurize the material along the area to be trimmed. This may be an edge of a plastic sheet, the perimeter of an article produced from the material, or may be holes or slots to be cut in the material. A knife or other tool, heated to a temperature high enough to melt the material, is then moved along the trim guide. The knife vaporizes the pressurized material along the trim guide, which creates a definitive point at which melting or vaporization of the material stops. The trim guide is made from metal having high heat-conductivity, such as aluminum which has sufficient heat-conductivity to create a point at which melting, caused by the knife vaporizing the material, stops.
REFERENCES:
patent: 3362043 (1968-01-01), Langdon et al.
patent: 3475526 (1969-10-01), Seto
patent: 3572424 (1971-03-01), Byrne
patent: 3684633 (1972-08-01), Haase
patent: 3707102 (1972-12-01), Huppenthal et al.
Creative Industries, Inc.
Lazarus Richard B.
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