PROCESS FOR PRODUCING A THERMOPLASTIC RESIN SHEET HAVING A COLOR BAND

摘要

A process is disclosed for producing a thermoplastic resin sheet having a band of color by feeding a molten thermo-plastic resin by an extruder into a sheet-forming flat die having a manifold and extruding said molten resin from an extrusion opening of said flat die, while forcing a stream of a colored molten thermoplastic resin through at least one injection port opened into the manifold of the flat die into a main stream of the molten resin extruded from the extruder and fed to the manifold, associating the main stream of the molten thermoplastic resin and the stream of the colored molten thermoplastic resin within the manifold while the main stream is flowing in the extrusion and widthwise directions in said manifold, and extruding the associated streams from the extrusion opening of said flat die.