Method of preparing polyamide

A technology of polyamide film and manufacturing method, applied in metal processing and other directions, can solve problems such as difficulties, various physical property deviations, difficulty in tension control, etc., and achieve the effect of reducing losses and fewer core wrinkles

Active Publication Date: 2007-10-24
UNITIKA LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the method described in Patent Document 1, it is difficult to uniformly and rapidly cool the film with a spray gun, and therefore there is a problem that various physical properties of the film vary.
In addition, the slipperiness decreases due to moisture absorption, and various defects may occur in the slitting process or conversion process
[0009] The method described in Patent Document 2 is effective when the width is very small after being cut into strips like a tape, but there is a problem that it is difficult to control each tension when it has a certain width like a packaging film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The strip cutter room was adjusted to an absolute humidity of 0.013 kg / kg (temperature: 25° C., relative humidity (RH): 65%). Using a center-driven drum contact type cutting machine, the cutting conditions are set as follows: take 800mm wide x 5 strips, the winding tension is 98N / m (10kgf / m), and the winding pressure is 196N / m (20kgf / m), the winding speed is 300m / min.

[0051] The original roll A was set at the unwinding section of the slitter, and the paper was fed to the winding section, and wound for 100 m to remove the surface affected by moisture absorption during storage. Then, the winding side was replaced with a new paper tube, the film was attached, and winding was started, and a product roll of 4000 m was wound. Thereafter, a product roll of 4000 m was wound up four times in the same manner. At this time, the time from the stop of winding to the restart of winding was 6 minutes.

[0052] In this way, since the original roll A with low moisture content and ...

Embodiment 2

[0054] The absolute humidity of the slitter room was changed to 0.009 kg / kg (temperature: 23° C., relative humidity (RH): 50%). Furthermore, the time from the stop of winding to the restart of winding was changed to 12 minutes. Other than that, it carried out similarly to Example 1. In this way, because the time until rewinding becomes longer, wrinkles are slightly seen on the winding core, but due to the use of the original roll A with low moisture content and small hygroscopic elongation, and due to the absolute The humidity is adjusted to the specified conditions, so that the wrinkle hardly reaches the surface layer, and there is no charge, and high-quality rolled products can be obtained.

Embodiment 3

[0056] Change the original roll to C, and change the winding speed to 150m / min. Other than that, it carried out similarly to Example 1. In this way, since the original roll with small hygroscopic elongation is used to adjust the absolute humidity of the environment when the strip is cut, it is possible to obtain a high-quality rolled product with no wrinkles from the core to the surface, no electricity, and no electricity. However, since the raw roll C has a high moisture content, the slipperiness is lowered, and thus the winding speed cannot be increased.

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Abstract

When the polyamide film is slit and wound, moisture absorption of the polyamide film in the slitting process is controlled, thereby preventing wrinkles from being mixed into the product roll, and obtaining a polyamide film roll with less wrinkles on the winding core . When slitting a rolled polyamide film into strips, use a polyamide film with a hygroscopic elongation of 2.0% or less, and control the environment at the time of slitting to an absolute humidity of 0.006 to 0.018 kg/kg.

Description

technical field [0001] The present invention relates to a method for the manufacture of polyamide membranes. Background technique [0002] Polyamide films containing polyamide resins generally have excellent mechanical properties, optical properties, thermal properties, gas barrier properties, and toughness, and are widely used mainly for packaging purposes, especially food packaging applications. [0003] Polyamide membranes are generally manufactured as follows. That is, after the polyamide resin is extruded from a T-die or a circular die to form a film, it is biaxially stretched by a flat simultaneous biaxial stretching method, a flat sequential biaxial stretching method, a blow molding stretching method, etc. After stretching and heat setting, it is temporarily wound up into a wide and long original roll (original roll) with a winder. Then, the film fed out from the original roll is cut into a desired width and length by a slitter, and shipped and sold as a finished ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L77/00B26D5/00
Inventor 南条一成
Owner UNITIKA LTD
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