Biaxially oriented polypropylene film
A polypropylene film, biaxially oriented technology, applied to other household appliances, flat products, household appliances, etc., can solve the problems of easy wrinkles in the sealing part, low film orientation, insufficient rigidity, etc., and achieve excellent strength and rigidity , Excellent effect of heat resistance
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Embodiment 1
[0233] As the polypropylene resin, a propylene homopolymer PP-1 (manufactured by Sumitomo Chemical Co., Ltd., Sumitomo Noblen FLX80E4) of MFR=7.5 g / 10 minutes, Tc=116.2° C., and Tm=162.5° C. was used. It was extruded in a sheet form from a T-die at 250° C., brought into contact with a 20° C. cooling roll, and directly dropped into a 20° C. water tank. Then use two pairs of rollers to stretch to 4.5 times at 145°C along the length direction, then clamp both ends with clamps, introduce it into a hot air oven, preheat at 170°C, and then stretch it at 160°C along the width direction as the first stage. It stretched 6 times, and then stretched 1.36 times at 145 degreeC as a 2nd stage, and stretched 8.2 times in total. Immediately after stretching in the width direction, it was cooled at 100°C in a state fixed to a jig, and then heat-set at 163°C. The film thus obtained had a thickness of 18.7 µm. Table 1 shows the structure of the polypropylene resin, and Table 2 shows the film f...
Embodiment 2
[0235] As the polypropylene resin, 80 parts by weight of PP-1 and 20 parts by weight of propylene homopolymer PP- 2 (Sumitomo Chemical Co., Ltd., EL80F5) was used. The stretching temperature in the longitudinal direction was 142° C., the stretching temperature in the first step in the width direction was 162° C., and the heat setting temperature was 165° C., in the same manner as in Example 1. The thickness of the obtained thin film was 21.3 μm. Table 1 shows the structure of the polypropylene resin, and Table 2 shows the film forming conditions. The physical properties are as shown in Table 3, and a film having high rigidity and low heat shrinkage at high temperature was obtained.
Embodiment 3
[0237] It carried out similarly to Example 2 except having implemented 3% relaxation at the time of heat fixing. The thickness of the obtained thin film was 21.1 μm. Table 1 shows the structure of the polypropylene resin, and Table 2 shows the film forming conditions. The physical properties are as shown in Table 3, and a film having high rigidity and low heat shrinkage at high temperature was obtained.
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