Method of producing thermoplastic resin film and apparatus...

B - Operations – Transporting – 29 – C

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B29C 47/88 (2006.01) B29C 33/04 (2006.01) B29C 39/38 (2006.01) B29C 55/00 (2006.01)

Patent

CA 2264554

A method of producing a thermoplastic resin film capable of giving a biaxially oriented polyester film at a speed of as high as at least 400 m/min and an apparatus therefor. Specifically, a method of producing a thermoplastic film, wherein a molten thermoplastic resin film is closely bonded to, and cooled and solidified, on a cooling medium to prepare a cast film, characterized in that the surface temperature of the medium immediately before the melt is brought into contact therewith is higher than a glass transition temperature Tg of the thermoplastic resin but is lower than a melting point Tm thereof. The apparatus has a heater device and a cooler provided in the cooling medium so that the surface temperature of the medium immediately before the melt is brought into contact therewith is higher than the glass transition temperature Tg of the thermoplastic resin but is lower than the melting point Tm thereof, and the surface temperature of the medium immediately before being peeled off is maintained to be lower than the glass transition temperature Tg of the thermoplastic resin.

L'invention concerne un procédé de production d'un film de résine thermoplastique qui permet de produire un film polyester orienté biaxialement, à une vitesse au moins aussi élevée que 400 m/min, ainsi qu'un appareil de production associé. Ce procédé comprend les étapes consistant à lier étroitement un film de résine thermoplastique fondue et un support de refroidissement, puis à refroidir ce film, lequel se solidifie sur le support, le procédé étant caractérisé en ce que la température de surface du support, immédiatement après sa mise en contact avec la matière en fusion, est supérieure à une température de transition vitreuse Tg de la résine thermoplastique, mais inférieure à un point de fusion Tm de celle-ci. L'appareil de l'invention comprend un dispositif de chauffage et un dispositif de refroidissement placés dans le support de refroidissement, de façon que la température de surface de ce support, immédiatement avant sa mise en contact avec la matière en fusion, soit supérieure à la température de transition vitreuse Tg de la résine thermoplastique, mais inférieure au point de fusion Tg de celle-ci, la température de surface du support, immédiatement avant l'arrachage du film, étant maintenue à un niveau inférieur à la température de transition vitreuse Tg de la résine thermoplastique.

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