Methods and apparatus for extruding a tubular film

Details Methods and apparatus for extruding a tubular film Methods and apparatus for extruding a tubular film

B - Operations, Transporting

29

C

B29C 47/06 (2006.01) A23G 3/20 (2006.01) A23L 1/00 (2006.01) A23P 1/12 (2006.01) B29C 47/16 (2006.01) B29C 47/20 (2006.01) B29C 47/22 (2006.01) B29C 47/28 (2006.01)

Patent

CA 2430810

Processes and apparatus for extruding a tubular film of polymer material. The apparatus comprises a circular coextrusion die having an inlet (10) for the or each component and having an exit channel (18) ending in a circular exit orifice (21) which is located radially outwardly from the die axis compared to the inlet (10). The die comprises several planar or conical die parts (5, 6, 7, 28, 29) clamped together, with surfaces supplied with grooves (14) shaped to form channels (11, 12, 13) for the flow polymer material. The shape of the channels is adapted to equalize the flow over the circumference of the exit orifice (21), and the flow of material is divided between the inlet (10) and the exit (21) into a number of part flows (13) of generally helical form with space (15) provided for overflow of material between said part flows, whereby the part are adapted so that they join to one common, circular flow.

L'invention concerne des procédés et un appareil permettant d'extruder un film tubulaire à partir d'un matériau polymérique. Cet appareil est composé d'un moule de coextrusion circulaire pourvu d'une entrée (10) pour le ou chaque composant et d'un canal de sortie (18) terminé par un orifice de sortie circulaire (21), placé radialement vers l'extérieur à partir de l'axe du moule par rapport à l'entrée (10). Le moule est doté de plusieurs parties de moule coniques ou planes (5, 6, 7, 28, 29) fixées ensemble, dont les surfaces sont pourvues de rainures (14). La forme des canaux est adaptée pour égaliser le passage par la circonférence de l'orifice de sortie (21) et le passage du matériau se divise entre l'entrée (10) et la sortie (21) en un certain nombre de passages partiels (13) généralement de forme hélicoïdale avec un espace (15) prévu pour le surplus de matériau circulant entre les passages partiels, ainsi les parties sont adaptées de manière à se rejoindre en un seul passage circulaire commun.

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