METHOD OF EXTRUDING LAMINATES
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Abstract
A METHOD IS DESCRIBED WHEREBY PLASTIC FILM OR SHEET HAVING A PLURALITY OF LAYERS IS FORMED BY DEFORMING A FLOWING STREAM HAVING LAYERS OF DIVERSE THERMOPLASTIC MATERIAL WHEREIN THE CROSS-SECTIONAL DONFIGURATION OF THE PLURALITY OF FLOWING STREAMS IS ALTERED BY REDUCING THE DIMENSION OF THE STREAM IN A DIRECTION GENERALLY PERPENDICULAR TO THE INTERFACES BETWEEN THE INDIVIDUAL STREAMS AND BY INCREASING THE DIMENSION OF THE STREAM IN A DIRECTION GENERALLY PARALLEL TO THE SAID INTERFACE TO PROVIDE A SHEET OR FILM HAVING A LAMINAR STRUCTURE. OPTIONALLY, ALTERNATING FOAMED AND UNFOAMED LAYERS MAY BE OBTAINED.
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