B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/70 (2006.01) B29C 47/14 (2006.01) B29C 47/28 (2006.01) B29C 47/92 (2006.01) B29C 47/04 (2006.01)
Patent
CA 2603513
A method and apparatus for extrusion of flat or tubular films from thermoplastic material is described. Improvements concern equalisation of the lateral distribution of the flow velocity achieved in combination with elimination in part or in full of die- lines formed at interfaces where part flows join each other. The improvement involves the provision of edges (100) of the ends of die-walls which separate the part-flows from one another being slanted to form a lateral displacement over the length of said edge, or are provided with screw shaped vanes.
Cette invention concerne un procédé et un appareil d'extrusion de films plats ou tubulaires à partir de matière thermoplastique. Les améliorations concernent l'égalisation de la répartition latérale de la vitesse d'écoulement obtenue en association avec l'élimination partielle ou totale des lignes de filière formées aux interfaces où les écoulements partiels se rejoignent. Ces améliorations consistent à concevoir les bords des extrémités des parois de filière qui séparent les écoulements partiels avec une inclinaison pour former un décalage latéral sur la longueur desdits bords ou à les doter de vannes en forme de vis.
Borden Ladner Gervais Llp
Rasmussen Ole-Bendt
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