Method for the production of low orientation thermoplastic...

B - Operations – Transporting – 29 – C

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B29C 47/90 (2006.01) B32B 31/30 (2000.01)

Patent

CA 2487046

The invention relates to a process for producing films in the thickness range from 20 µm to 1 000 µm from thermoplastics through extrusion of the plastic through a slot die and smoothing the melt film emerging from the slot die in a polishing stack, composed of at least three or four rollers, where a first roller pair (1, 2) forms a polishing nip to receive the melt film and, downstream of this polishing stack nip, the melt film is passed through a subsequent polishing nip or through a subsequent pressure nip, characterized in that the ratio between the width of the die gap and the film thickness is in the range from 1 : 1 to 6 : 1, and in that the quotient obtained by dividing the film web speed in the subsequent polishing nip or in the subsequent pressure nip by the film web speed in the polishing nip formed by the roller pair (1, 2) is in the range from 0.8 to 1.05.

L'invention concerne un procédé de fabrication de feuilles d'une épaisseur comprise entre 20 ñm et 1 000 ñm à partir de plastiques thermoplastiques. Ces feuilles sont fabriquées par extrusion du plastique à travers une filière plate (4) et lissage du film fondu (5) issu de cette filière plate dans une lisseuse composée d'au moins trois ou quatre rouleaux (1, 2, 3), une première paire de rouleaux (1, 2) formant une fente de lissage destinée à recevoir le film fondu et ce film fondu étant guidé, après cette fente de lissage, à travers une fente de lissage ou de pression suivante. La présente invention se caractérise en ce que le rapport de la largeur de la fente de filière sur l'épaisseur des feuilles est compris entre 1: 1 et 6: 1 et le quotient de la vitesse des feuilles dans la fente de lissage ou de pression suivante divisé par la vitesse des feuilles dans la fente de lissage, formée par la paire de rouleaux (1, 2), est compris entre 0,8 et 1,05.

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