B - Operations – Transporting – 29 – B
Patent
B - Operations, Transporting
29
B
B29B 7/48 (2006.01) B29B 7/46 (2006.01) B29C 47/60 (2006.01)
Patent
CA 2191860
Multi-screw, extrusion-compounding machines (20) having co-rotating screw assemblies (21, 22) incorporating sets of modular mixing elements (51, 52, 53, 54) of non-symmetrical geometries with relatively large wing tip clearances are disclosed. These sets of non-symmetrical modular mixing elements (51, 52, 53, 54) are removably mountable at any suitable axial locations along their respective rotationally-driven screw shafts (30) for optimizing performance in relationship to particular plastic material and particular additives being compounded. The non-symmetrical geometries provide dynamic wedging pressurization for repeatedly propelling relatively large circumferential flows of the plastic material through large shear clearances. Due to the relatively large shear clearances, the plastic material is mixed at less elevated and more uniform temperatures than usually occurs with use of prior symmetrical kneading blocks or kneading discs. At less elevated temperatures most plastic materials exhibit increased viscosities. Thus, the resultant increased viscosities enable the plastic material to be processed at higher shear stresses for enhancing dispersive mixing, in spite of the relatively large clearances.
L'invention concerne des machines (20) d'extrusion-compoundage multivis présentant des ensembles vis co-rotatifs (21, 22) comprenant des batteries d'éléments de mélange modulaires (51, 52, 53, 54) à géométries non symétriques, comportant des espacements de bout d'aile relativement grands. Ces batteries d'éléments de mélange modulaires non symétriques (51, 52, 53, 54) sont montables de manière amovible en n'importe quel emplacement axial approprié le long de leur axes de vis (30) respectifs mis en rotation, afin d'optimiser le rendement par rapport à la matière plastique particulière et aux additifs particuliers malaxés. Les géométries non symétriques assurent une mise sous pression de malaxage dynamique destinée à propulser de façon répétée des flux circonférentiels relativement importants de la matière plastique dans de grands espaces de cisaillement. Du fait des espaces de cisaillement relativement grands, la matière plastique est mélangée à des températures moins élevées et plus uniformes ayant cours usuellement avec les blocs ou disques de malaxage symétriques actuels. A des températures moins élevées la plupart des matières plastiques présentent des viscosités supérieures. Ainsi, les viscosités supérieures obtenues permettent de traiter la matière plastique à des contraintes de cisaillement supérieures avec un mélange dispersif accru, malgré les espacements relativement grands.
Canedo Eduardo L.
Pereira Jose M.
Poscich Douglas V.
Valsamis Lefteris N.
Farrel Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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