Screw designs having improved performance with low melting...

Details Screw designs having improved performance with low melting... Screw designs having improved performance with low melting...

B - Operations, Transporting

29

C

B29C 45/60 (2006.01) B29C 47/60 (2006.01)

Patent

CA 2726638

Disclosed is a process for a melt processing a polyethylene terephthalate. The polyester particles have at least two melting peaks. The polyester particles may have an It. V. at their surface which is less than 0.25 dL/g higher than the It. V. at their center. The polyester particles may have not been solid stated. The melt processing device comprises a screw with a total length (9), L, a feed zone length (3) in the range from 0.1 SL and 0.45L, a taper angle, in the range from 0.5 degrees and 5.0 degrees and a compression ratio, CR, in the range from 2.0 and 5Ø

La présente invention concerne un procédé pour le traitement à chaud de polyéthylène-téréphtalate. Les particules de polyester ont au moins deux pics de fusion. Les particules de polyester peuvent avoir un It. V. à leur surface qui est inférieure à 0,25 dl/g supérieure à la It. V. à leur centre. Les particules de polyester peuvent ne pas avoir été amenées à létat solide. Le dispositif de traitement à chaud comprend une vis ayant une longueur totale (9), L, une longueur de zone dalimentation (3) dans la plage de 0,15L et 0,45L, un angle conique, dans la plage de 0,5 degré et 5,0 degré et un taux de compression, CR, dans la plage de 2,0 et 5,0.

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