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A slot die apparatus for the coextrusion of an endless sheet having a thickness of about 0.1-5 mm with an optionally dyed edge strip made from a narrower, optionally colored, melt stream of a width of about 100-500 mm and from a broader melt stream of a width of about 1,000-3,000 mm of a thermoplast

A slot die apparatus for the coextrusion of an endless sheet having a thickness of about 0.1-5 mm with an optionally dyed edge strip made from a narrower, optionally colored, melt stream of a width of about 100-500 mm and from a broader melt stream of a width of about 1,000-3,000 mm of a thermoplastic synthetic resin is provided by means of two parallel-operating extruders and associated melt pumps, with merging of the two melt streams. The apparatus is also provided by flanging together, by means of a flange, two dies at their end faces, these dies having identical cross sections and a corresponding width, comprising a spreader block, deckle, bottom lip, and top lip, and a flow channel made up from these components.

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A process for the production of an endless color wedge sheet from a thermoplastic synthetic resin with a colored edge strip, the color intensity of which passes over continuously into an undyed zone, in a region adjoining the colored edge strip, which comprises injecting, into a die composed of two

A process for the production of an endless color wedge sheet from a thermoplastic synthetic resin with a colored edge strip, the color intensity of which passes over continuously into an undyed zone, in a region adjoining the colored edge strip, which comprises injecting, into a die composed of two parts of identical cross section, (1) a stream of undyed melt having a predetermined width and (2) a stream of dyed melt having a width narrower than the stream (1), as well as (3) a partial stream having a quantity Y of dyed melt and a partial stream having a quantity (X-Y) of undyed melt, in a width, starting from the parting line between dyed melt and undyed melt, less than the width of the stream of the dyed melt, into the die part for the undyed melt with a continuously decreasing proportion Y of the dyed melt with respect to the undyed melt X, by means of a probe lying in the transverse direction to the flow direction of the melt and exhibiting a groove gradually ending in cross section; effecting coextrusion with merging of the undyed melt stream with the dyed melt stream in the zone of the color wedge whereby, in sheet cross section, an overlapping line, extending obliquely at an ascension angle a5°-30°with respect to the horizontal, separates the undyed sheet material from the dyed sheet material. A slot die apparatus for coextrusion of a partially colored endless thermoplastic sheet having an undyed edge portion, a dyed color-wedge and a dyed edge portion which comprises a feed port for the introduction of an undyed melt of a thermoplastic synthetic resin, a feed port for the introduction of a dyed melt of a thermoplastic synthetic resin, a distributing flow channel including a deckle bar, bypass means for diverting a portion of the dyed melt from the feed port, and means for defining an outlet nozzle in communication with the distributing flow channel for extruding the partially colored sheet; said means defining the flow channel comprising two die slot elements connected together in side-by-side adjacent relationship which are geometrically identical in longitudinal cross-section and vertical cross-section, one of said die elements effecting the extrusion of the dyed melt and the other of the die slot elements effecting extrusion of the undyed melt, the one die slot element in a zone immediately adjacent to the other die slot element having an injection feed port fed by said bypass means with a portion of said dyed melt, an injection nozzle arranged downstream of the injection feed port, said nozzle extending perpendicular to the extrusion direction of the melt into a portion of the flow channel containing the undyed melt from a parting line extending between the one die slot element and the other die slot element; said injection nozzle having a longitudinal section in a wedge-shape with a wedge angle of about 5°-30°for the formation of the color-wedge of the sheet.