Method and apparatus for trimming and finishing the outer edge o

Details Method and apparatus for trimming and finishing the outer edge o Method and apparatus for trimming and finishing the outer edge o

1984-04-30

1985-05-21

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

264161, 264296, 264322, 425297, 4253051, 425315, 425806, 425810, B29D 1700

Patent

active

045185514

ABSTRACT:
A method and apparatus is provided for trimming flash from the outer edge of thermoplastic molded records and then finishing the outer edge. A molded record having flash on its outer edge is supported on a turntable and then rotated about its center. The flash and the outer edge of the record immediately adjacent the flash are selectively heated, preferably by using a focused infrared lamp, to a temperature above the glass transition temperature. A cutter is then advanced tangentially through the flash to remove the heat-softened flash from the record. The trimmed outer edge is then finished by bringing a shaped surface into contact with the softened edge and holding it there while rotating the record until the outer edge has the desired finished configuration. The heating is discontinued and the trimmed and finished outer edge is allowed to solidify.

REFERENCES:
patent: 3186029 (1965-06-01), Joseph
patent: 3412427 (1968-11-01), Flusfeder et al.
patent: 4005965 (1977-02-01), Roczynski
patent: 4326325 (1982-04-01), Chambers et al.

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