Biaxial stretching polyamide film and preparation method thereof
A polyamide film and biaxial stretching technology, which is applied in packaging, wrapping paper, flexible coverings, etc., can solve the problems of increased thermal shrinkage rate and ease of heat treatment effect in the heat treatment process, and achieves reduced thermal shrinkage rate and reduced size. Improved stability and uniform physical properties
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 Dry nylon 6 with a relative viscosity of 3.0, put the nylon 6 into an extruder, melt it in a cylinder heated to 260°C, and melt and extrude it in a sheet form from a T-die. The unstretched sheet with a thickness of 150 μm was obtained by attaching it to a rotating drum with a surface temperature of 10° C. by an air knife casting method and quenching it. Next, this unstretched sheet was MD stretched at a temperature of 53 to 62° C. and a stretch ratio of 2.7 times using an MD stretching machine including a heating roll group having different peripheral speeds. Next, this MD stretched film was introduced into a tenter and preheated at 60°C. Tg of the film at this point was 44°C, Tcc was 70°C, Tc was 181°C, and Tm was 221°C. Thereafter, the film was adjusted so that the film temperature T1 was 80° C. until the stretch ratio in the transverse direction was 2 times, and the temperature was raised when the stretch ratio exceeded 2 times, and stretched until the stretch ratio...
 Except having set the film temperature T1 to 70 degreeC, it carried out similarly to Example 1, and obtained the biaxially stretched nylon 6 film. Table 1 shows the properties of the obtained biaxially stretched nylon 6 film.
 Except having changed the film temperature T2 to 160 degreeC, it carried out similarly to Example 1, and obtained the biaxially stretched nylon 6 film. Table 1 shows the properties of the obtained biaxially stretched nylon 6 film.
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