Annular extrusion head for the production of blown tubular...

B - Operations – Transporting – 29 – C

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Details

B29C 47/20 (2006.01) B29C 47/28 (2006.01) B29C 47/70 (2006.01)

Patent

CA 2229627

An annular extrusion head for the production of tubular films, of a type comprising at least one cylindrical body (2) fitted on its surface with a number of adduction channels (6) for the molten material, esternally closed by a sleeve (1) inserted over said cylindrical body and ending in an extrusion chamber (4) equipped in its upper section with an annular gap (5) from which the product exits, in which the molten material is fed to said channels by a feeding conduit (3) wherein said feeding conduit is connected to the said adduction channels by a series of connecting channels (7) having a symmetrical tree-shaped structure leading to each branching off point, where said tree-shaped structure extends to the point of attaining a number of branches equal to the said adduction channels, so that the path of the material coming from the said feeding conduit is identical for all channels.

Tête d'extrusion annulaire utilisée pour fabriquer des feuilles tubulaires. Elle est du type comprenant au moins un corps cylindrique (2) pourvu à sa surface de plusieurs canaux d'adduction (6) pour la matière en fusion; elle est fermée à l'extérieur par un manchon (1) inséré sur le corps cylindrique et se termine dans une chambre d'extrusion (4) munie dans sa partie supérieure d'un espace annulaire (5) à partir duquel le produit sort. La matière en fusion est envoyée aux canaux par un conduit d'alimentation (3); le conduit d'alimentation est relié aux canaux d'adduction par une série de canaux de connexion (7) possédant une structure symétrique en forme d'arbre menant à chaque point de dérivation, et cette structure s'étend jusqu'à atteindre un nombre d'embranchements égal au nombre de canaux d'adduction, afin que le trajet de la matière provenant du conduit d'alimentation soit identique pour tous les canaux.

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