Heat-shrinkable polyester film and process for producing the same
A manufacturing method and heat-shrinking technology, which can be used in thin material processing, flat products, and other household appliances, etc., can solve the problems of low mechanical strength and easy breakage, and achieve the effect of high shrinkage characteristics
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Embodiment 1
[0112] The above-mentioned polyester 1 and polyester 2 were mixed at a weight ratio of 75:25, and charged into an extruder. Then, the mixed resin was melted at 280° C., extruded from a T die, wound on a rotating metal roll cooled to a surface temperature of 30° C., and quenched to obtain an unstretched resin with a thickness of 200 μm. film. The take-up speed (rotational speed of the metal roll) of the unstretched film at this time was about 20 m / min. In addition, Tg of the unstretched film was 76°C. Then, the unstretched film was guided to a tenter (first tenter) in which a transverse stretching zone, an intermediate zone, and an intermediate heat treatment zone were successively provided. In addition, in this tenter, the length of the intermediate region located between the transverse stretching region and the intermediate heat treatment region was set to about 40 cm. In addition, in the middle region, when the elongated paper sheet is hung down without passing the film, ...
Embodiment 2
[0117] In the same manner as in Example 1 except that the final heat treatment temperature in the second tenter was changed to 135°C, a biaxially stretched film (heat-shrinkable film) of about 30 μm was obtained. Winding film rolls. In addition, the properties of the obtained thin film were evaluated by the method described above. The evaluation results are shown in Table 3.
Embodiment 3
[0119] Except that the transverse draw ratio in the first tenter was changed to 3.7 times, and the final heat treatment temperature in the second tenter was changed to 130° C., by the same method as in Example 1, the obtained A film roll in which a biaxially stretched film (heat-shrinkable film) of about 30 μm is wound through a predetermined length. In addition, the properties of the obtained thin film were evaluated by the method described above. The evaluation results are shown in Table 3.
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