Annular co-extrusion die

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/26 (2006.01) B29C 47/06 (2006.01) B29C 47/20 (2006.01)

Patent

CA 2485454

An annular co-extrusion die for extruding multi-layer tubular plastic film has inner die members stacked one upon another, with respective radially outwardly extending helical passages defined between respective pairs of inner die members. An annular outer die member surrounds the stacked inner die members and forms a longitudinally extending annular passage therebetween for conveying plastic material from the helical passages to an annular extrusion orifice. Feed passages in the inner die members carry plastic materials to the respective helical passages, so that each helical passage can provide a layer in a multi-layer plastic film extruded into the annular passage and from the annular extrusion orifice.

Filière pour co-extrusion annulaire visant à extruder le film plastique tubulaire à plusieurs couches et comportant des filières superposées les unes sur les autres, avec des canaux hélicoïdaux respectifs s'étendant sur le radial et définis entre les paires respectives des filières intérieures. Une filière annulaire extérieure entoure les filières intérieures superposées et forme un canal annulaire s'étendant longitudinalement entre ces dernières pour transporter le matériel plastique des canaux hélicoïdaux à un orifice d'extrusion annulaire. Les canaux d'alimentation dans la filière intérieure transportent le matériel plastique aux canaux hélicoïdaux respectifs, de sorte que chaque canal hélicoïdal peut fournir une couche de film plastique à plusieurs couches extrudées dans le canal annulaire, à partir de l'orifice d'extrusion annulaire.

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