Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1983-09-19
1985-08-06
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264 37, 4251311, 4251335, 425462, B29F 304
Patent
active
045335109
ABSTRACT:
An apparatus and method for continuously producing a sheet composed of a plurality of materials co-extruded in segments along the width of the sheet are provided. The extrusion die has a slit extending along the width of the die, the slit being divided into a plurality of adjacent sections along the length of the slit. The widths of each of the segments are variable and can be accurately controlled. Feeding means for feeding material to each of the separate adjacent sections is provided. The method and apparatus are effective to produce a thermoplastic sheet having two or more layers in a central portion of the sheet and only a single layer at the edge portions of the sheet.
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