Process for metering color concentrates to thermoplastic...

Details Process for metering color concentrates to thermoplastic... Process for metering color concentrates to thermoplastic...

B - Operations, Transporting

29

C

18/588, 18/798

B29C 47/10 (2006.01) B29B 7/88 (2006.01)

Patent

CA 1335234

Continuous strands of color concentrate are metered into the feed zone of a screw-melter polymer extruder where they are cut into pellets by the shearing action of the flights of a rotating screw against the extruder housing. These pellets are mixed within the extruder with a thermoplastic polymer to be colored and this mixture is then melted and extruded into a useful article, for example, a fiber for textile or carpeting end-use. Additionally, color concentrates can be first formed into continuous strands and stored conveniently on a spool for subsequent metering into the polymer extruder.

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