Process and apparatus for producing a synthetic resin sheet havi

Details Process and apparatus for producing a synthetic resin sheet havi Process and apparatus for producing a synthetic resin sheet havi

1983-10-25

1985-12-31

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Random variegated coloring during molding

By extrusion

264171, 264245, 4251311, 4251335, 425146, 425462, B29F 310

Patent

active

045620237

ABSTRACT:
Process and apparatus for producing a sheet or film exhibiting a colored band of varying color intensity, with an extruder for melting a stream of a thermoplastic synthetic resin and with a slot die tool (e.g. a fishtail die) having a distributor duct with a throttle zone arranged upstream thereof, a back pressure plate or restrictor bar, and a nozzle orifice, wherein a colorless melt stream and a dyed melt stream are respectively shaped into a sheet having the desired width and are melted together prior to exiting from the die tool along a lateral edge to form one sheet; and wherein along a predetermined width, calculated from a transition line of the dyed sheet, a wedge-like extending color band made up of a partial stream of the dyed melt stream is introduced into the zone of the colorless sheet by way of a slot die having a wedge-like orifice and being arranged in the extrusion direction upstream of the back pressure plate and downstream of the distributor duct, with a corresponding displacement of the colorless melt stream.

REFERENCES:
patent: 1603812 (1926-10-01), Stein
patent: 2696640 (1954-12-01), Wienand
patent: 2709834 (1955-06-01), Johnson
patent: 3354025 (1967-11-01), Aykanian et al.
patent: 3405425 (1968-10-01), Buckley et al.
patent: 3443278 (1969-05-01), Nauta
patent: 3770357 (1973-11-01), Gibney
patent: 3799718 (1974-03-01), Kiyono et al.
patent: 4128386 (1978-12-01), Wissinger et al.
patent: 4185951 (1980-01-01), Webermeier et al.
patent: 4316868 (1982-02-01), Esposito et al.

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