Polyamide resin film roll, and production method therefor

A polyamide and resin film technology, which is used in thin material processing, winding strips, flat products, etc., to achieve the effects of excellent pinhole resistance, low crystallization degree and uniform thickness

Inactive Publication Date: 2007-09-26
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot be said to be a decisive method as a method of suppressing changes and deviations in physical properties such as boiling water shrinkage and refractive index of a film wound into a film roll.

Method used

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  • Polyamide resin film roll, and production method therefor
  • Polyamide resin film roll, and production method therefor
  • Polyamide resin film roll, and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] The above flakes A and B were pre-dried while raising the temperature to about 120° C. with a 15 kl stirring device over about 8.0 hours. A certain amount of each flake was collected from the blender, and its water content was measured. The water content of flakes A and B were both 800 ppm. In addition, the measurement of the water content was performed using a Karl Fischer moisture meter (MKC-210 manufactured by KYOTO Electronics Co., Ltd.), under the conditions of a sample weight of 1 g and a sample heating temperature of 230°C.

[0125] Then, the flakes in each mixer are continuously supplied to the hopper directly above the extruder respectively by a quantitative screw feeder. In addition, the supply amount of the sheet A was 5.0% by weight, and the supply amount of the sheet B was 95.0% by weight. The hopper had a capacity of 150 kg of raw material flakes, and the discharge of the extruder was 450 kg per hour. In addition, adjust the inclination angle of the hopp...

Embodiment 2

[0153] The polyamide-based resin film of Example 2 was obtained in the same manner as in Example 1, except that the stretching speed of the molten sheet was changed to 75 m / min, and the heat setting temperature after biaxial stretching was changed to approximately 216°C. roll. Then, the properties of the obtained film roll were evaluated by the same method as in Example 1. The evaluation results are shown in Tables 4-8.

Embodiment 3

[0155] After the unstretched film obtained by the same method as in Example 1 is stretched (the first longitudinal stretch) to about 2.2 times with a roll made of Teflon at a stretching temperature of about 90° C., the roll is stretched at about 70 with a roll made of ceramics. Lengthwise stretching (second longitudinal stretching) at about 1.5 times at °C. Furthermore, in the same manner as in Example 1, the longitudinally stretched sheet was continuously introduced into a tenter, stretched horizontally to approximately 4.0 times at approximately 130° C., heat-set at approximately 213° C., and cooled after performing a 5% transverse relaxation treatment. , by cutting both edge portions, continuous film formation to produce a biaxially stretched film of about 15 μm over 2000 m. In addition, the range of change in the surface temperature of the film during the continuous production of the film was the same as in Example 1. The polyamide-based resin film roll of Example 3 was o...

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Abstract

The invention provides a process for efficiently producing a biaxially oriented polyamide-based resin film roll capable of bag-making processing through laminating smoothly with high yield. The process for producing a polyamide-based resin film roll of the invention comprises the melting extruding cooling step of conducting melt extrusion of a polyamide-based resin in the form of a sheet and cooling of the extrudate on the surface of a moving cooling body to thereby obtain an unoriented sheet; the biaxial drawing step of biaxially drawing the unoriented sheet in the lengthwise direction and lateral direction; and the take-up step of winding in roll form the biaxially oriented film resulting from the biaxial drawing. In the melting extruding cooling step, during the melt extrusion of the polyamide-based resin and cooling of the extrudate on the surface of the moving cooling body, streamer corona discharge is carried out between an electrode having a direct current high voltage applied thereto and a molten polyamide-based resin sheet to thereby realize application of satisfactory charges for bringing the molten polyamide-based resin sheet into close contact with the surface of the moving cooling body.

Description

technical field [0001] The present invention relates to a method for producing, at high productivity, a high-quality film roll having uniform physical properties in the longitudinal direction. The film roll is formed by winding a polyamide-based resin film. A method for producing a roll of a polyamide-based resin film having good processability when the olefin-based resin film is laminated and used for packaging of retort food and the like. Background technique [0002] Because the biaxially oriented polyamide resin film with nylon as the main component is relatively tough, and has excellent air resistance, pinhole resistance, transparency, and printability, it is widely used in various liquid foods and water-containing foods. , Frozen food, steamed food, pasty food, livestock meat, aquatic food and other food packaging materials, especially in recent years, it has been widely used in the packaging of steamed food. This polyamide-based resin film is laminated with polyolefi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/16B29C47/14B29C71/04B65H18/00B29K77/00B29L7/00B29C48/305
Inventor 西忠嗣长田敏文宫口义纪小田尚伸野濑克彦
Owner TOYOBO CO LTD
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