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|1. (WO2018033354) DEVICE AND METHOD FOR PRODUCING A DYED AND AN UNDYED PLASTIC MELT|
|Title:||DEVICE AND METHOD FOR PRODUCING A DYED AND AN UNDYED PLASTIC MELT|
The invention relates to a device (1) and a method for producing a dyed (S1) and an undyed (S2) plastic melt, comprising a multiple screw extruder (2), a first metering device (3) and a second metering device (4), and a control device (5) for selecting between a first operating mode (B1) for producing the dyed plastic melt and a second operating mode (B2) for producing the undyed plastic melt. The first metering device is used to feed an undyed plastic material (M) through a first feed opening (16) into a housing (6) of the multiple screw extruder, whereas the second metering device is used to feed at least one dye granulate (G) through a second feed opening (17) into the housing. To produce the undyed plastic melt, the plastic material is fed exclusively via the first feed opening so that any dye granulate or dyeing agent (F) therein still remaining in the second metering device or in the region of the second feed opening does not contaminate the undyed plastic melt.