Method for producing polybutylene terephthalate film

Details Method for producing polybutylene terephthalate film Method for producing polybutylene terephthalate film

B - Operations, Transporting

29

C

B29C 55/06 (2006.01) B29C 47/88 (2006.01)

Patent

CA 2507430

In the method of the present invention, a molten polybutylene terephthalate resin is extruded from a T-die in the form of a film, the thus-obtained substantially undrawn film is slowly cooled so as to crystallize the polybutylene terephthalate resin, and then the thus-obtained crystallized film is drawn.

Selon le procédé de l'invention, une résine en fusion de poly(butylène téréphtalate) est extrudée à partir d'une matrice en T sous forme de film. Le film sensiblement non étiré ainsi obtenu est lentement refroidi de manière à faire se cristalliser la résine de poly(butylène téréphtalate), puis le film cristallisé est soumis à étirage.

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