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1. (WO2018033354) DEVICE AND METHOD FOR PRODUCING A DYED AND AN UNDYED PLASTIC MELT

Pub. No.:    WO/2018/033354    International Application No.:    PCT/EP2017/068948
Publication Date: Fri Feb 23 00:59:59 CET 2018 International Filing Date: Fri Jul 28 01:59:59 CEST 2017
IPC: B29B 7/74
B29B 7/40
B29B 7/48
B29B 7/60
B29B 7/72
B29B 7/80
B29B 7/88
B29C 47/08
B29C 47/10
B29C 47/36
B29B 9/06
B29B 9/12
Applicants: COPERION GMBH
Inventors: CONRAD, Ulrich
KERN, Norbert
SCHMUDDE, Markus
STÖHRER, Bernhard
HORNBERGER, Heiko
Title: DEVICE AND METHOD FOR PRODUCING A DYED AND AN UNDYED PLASTIC MELT
Abstract:
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.