Film die head for the production of blown tubular film

Details Film die head for the production of blown tubular film Film die head for the production of blown tubular film

B - Operations, Transporting

29

C

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

Patent

CA 2577485

The invention concerns a film die head for producing blown tubular film from thermoplastic polymers. Films produced with conventional die heads often have dull streaks or wavy areas, the so-called port lines. The aim of the invention is to avoid these negative film properties by means of a film die head with several melt channels (9, 10, 11) in the form of annular slits arranged concentrically around the centre axis of the film die head, where the spiral distributor (8) of the inside melt channel is located in relation to the centre axis of the die head on the inside delimiting wail and the spiral distributor (6) of the outside melt channel is located in relation to the centre axis of the die head on the outside delimiting wall.

Tête de soufflage de films pour la production de films tubulaires soufflés à partir de matières thermoplastiques. Les têtes de soufflage de films classiques provoquent souvent sur le film des bandes troubles ou des zones ondulées, appelées bandes hélicoïdales. L'objet de la présente invention est d'éviter ces propriétés négatives des films. A cet effet, la tête de soufflage de films possède plusieurs canaux (9, 10, 11) à matière fondue en forme de fente annulaire, situés concentriquement autour de l'axe médian de la tête de soufflage, le distributeur hélicoïdal (8) du canal à matière fondue interne étant situé sur la paroi de délimitation interne par rapport à l'axe médian de la tête de soufflage et le distributeur hélicoïdal (6) du canal à matière fondue externe étant situé sur la paroi de délimitation externe par rapport à l'axe médian de la tête de soufflage.

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