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Biaxial stretching polyamide film and preparation method thereof

A polyamide film, biaxial stretching technology, applied in the directions of packaging, wrapping paper, flexible covering, etc., can solve the problems of softening the heat treatment effect in the heat treatment process and increasing the thermal shrinkage rate, and achieves the reduction of thermal shrinkage rate and physical properties. Uniform, dimensional stability improvement effect

Active Publication Date: 2007-10-24
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these methods, the effect of the heat treatment in the heat treatment step is moderated, and the thermal shrinkage rate is increased. Therefore, although the bow is reduced, the physical property difference in the TD direction is not reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Dry nylon 6 with a relative viscosity of 3.0, put the nylon 6 into an extruder, melt it in a barrel 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 w...

Embodiment 2

[0107] 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.

Embodiment 3

[0109] 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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PUM

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Abstract

The invention relates to the excellent feature of biaxial pull and stretch polyamide film with stable dimension, small heat extraction rate, consistence in magnitude direction. Along the random position of the horizontal direction of the film, the moisture absorption rate is 0. 5% or less. Treating the film under 100-degree hot water for five minutes, we find that the max. hot water extraction rate of the film is 3. 7% or even less, with their difference being 2. 5% or even less.

Description

technical field [0001] The present invention relates to a biaxially stretched polyamide film which can be favorably used as a food packaging material by laminating it with a polyolefin resin sheet such as polyethylene or polypropylene, and a method for producing the same. Background technique [0002] Biaxially stretched polyamide films have excellent mechanical properties, optical properties, dimensional stability, gas barrier properties, printing properties, and the like, and are therefore used in various fields as films for food and other packaging materials. [0003] The biaxially stretched polyamide film used for bag packaging materials is usually printed on the surface, laminated with polyethylene or polypropylene sheets, and the polyamide film is placed on the outside, and folded so that the creases are aligned with the longitudinal direction of the film during manufacture. (Generally also referred to as the direction of travel, machine direction, etc., hereinafter ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D65/02B65D65/38B29C55/14B29C71/02
Inventor 植田敦子志波智子
Owner UNITIKA LTD
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