FILM POLIESTER YANG MUDAH DICETAK DAN PEMBUATANNYA

摘要

A double-axis elongated polyester film for dyeing which simultaneously satisfies following formulas:The polyester film is prepared by melt-extruding polyester chips and cooling the extrudate in a cooling drum to prepare a non-crystalline sheet; elongating said sheet at a temperature between 80 and 100° C. which is higher than glass transition temperature (Tg) to make 3.0 to 3.6 folds of length in machine direction to obtain single-axis elongated film; further elongating the film to 3.0-4.2 folds of length in transverse direction at 120-140° C.; thermally treating the obtained film in Tenter's thermal treatment zone at 210-240° C. with at least 5 stages; and rolling the double-axis elongated film obtained by releasing 0.01-10% of the film in machine and/or transverse direction. The film obtained above must satisfy both formulas (1) and (2).