Thermoplastic film for graphical applications and method for...

B - Operations – Transporting – 29 – C

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B29C 47/88 (2006.01) B29C 43/24 (2006.01)

Patent

CA 2630879

In one embodiment, a method for making a film comprises: heating thermoplastic to above a glass transition temperature of the thermoplastic; passing heated thermoplastic through a die and onto a polished calendaring roll and a resilient calendaring roll, and passing the heated thermoplastic between the polished calendaring roll and the resilient calendaring roll to form the film. The resilient calendaring roll has an average roll surface roughness of about 0.5 ~m to about 0.9 ~m. A nip pressure between the calendaring rolls is about 100 kPa to about 2,000 kPa. The film has an average film surface roughness of about 0.5 ~m to about 0.9 ~m, a gloss of less than or equal to about 10, an average stress of less than or equal to about 60 nm, and a stress spread of less than or equal to about 50.

La présente invention concerne, dans un mode de réalisation, un procédé de production d'un film consistant à: chauffer un thermoplastique jusqu'à une température supérieure à sa température de transition vitreuse, passer le thermoplastique chauffé à travers une filière et sur un cylindre de calandrage poli et un cylindre de calandrage résilient, et passer le thermoplastique chauffé entre le cylindre de calandrage poli et le cylindre de calandrage résilient pour former le film. Ce dernier cylindre possède une rugosité de surface moyenne comprise entre 0,5 ?m et 0,9 ?m environ. Une pression de contact entre les cylindres de calandrage est comprise entre 100 kPa et 2000 kPa environ. Le film possède une rugosité de surface moyenne comprise entre 0,5 ?m et 0,9 ?m environ, un brillant inférieur ou égal à 10 environ, une contrainte moyenne inférieure ou égale à 60 nm environ et un écart de contrainte inférieur ou égal à 50 environ.

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