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Surface modification polyamide film and its manufacturing method

A polyamide film and surface modification technology, applied in the field of surface-modified polymer film and its manufacturing, can solve the problems of difficult operation, easy to cause adhesion or electric sparks, small processing spots, etc., and achieve the effect of difficult electrostatic obstruction

Active Publication Date: 2007-11-21
UNITIKA LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional corona discharge treatment, there are problems such as generation of fine treatment unevenness and occurrence of off-printing in recent halftone printing under severe conditions.
[0006] However, these methods have a problem in that, when the web is charged with a high electric field strength and the charge amount is uniformized, the absolute value of the charge amount of the web becomes large, and electrostatic disturbances such as sticking and electric sparks are likely to occur.
In addition, in the method of bringing it into contact with water or an aqueous solution, the device becomes complicated, which is industrially disadvantageous
Moreover, there is a disadvantage that plasma discharge treatment is difficult to handle compared with corona discharge treatment
As mentioned above, a simple and uniform surface modification method that can be applied to halftone printing under severe conditions in recent years has not been proposed so far.

Method used

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  • Surface modification polyamide film and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] As additives, a nylon 6 raw material containing 0.2% by mass of silica particles with an average particle diameter of 1.5 μm and 0.05% by mass of ethylene bis-octadecamide was prepared, and melt-extruded using an extruder and a T-die. The unstretched sheet was produced by winding this on a cast cylinder and cooling and solidifying it. This unstretched sheet was sent to a warm water tank whose temperature was adjusted to 70° C., and subjected to a humidity-conditioning treatment for 1 minute. Then, the end of the sheet in the width direction is held by the clips of a flat simultaneous biaxial stretching machine, and simultaneously biaxially stretched at a stretch ratio of 3.0 times in length and 3.3 times in width at 195°C. . Then, the relaxation rate in the transverse direction was set to 5%, heat treatment was performed at 200° C. for 3 seconds, and a cooling step was performed to obtain an original biaxially stretched polyamide film having a width of 4 m and a thickn...

Embodiment 2～4 and comparative example 1～5

[0058] Compared with Example 1, the number of times of corona treatment and the average electric field intensity were changed. Other than that, it carried out similarly to Example 1, and obtained the surface-modified polyamide film. Table 1 shows the measurement results of the obtained polyamide film. In addition, when the number of times of corona discharge treatment was 1 time, corona discharge treatment was performed without using the discharge electrode 4 in FIG. 1. When the number of times of the corona discharge treatment was three times, after the treatment was performed twice in the same manner as in Example 1, the discharge electrode 4 was not used, and the corona discharge treatment was further performed once more.

[0059] corona discharge

Processing times

(Second-rate)

average electric field strength

(kV / cm)

θ1max-θ1min

(deg)

θ1av

(deg)

θ2max-θ2min

(deg)

wetting tension

(mN / m)

halftone printa...

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PUM

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Abstract

Surface modification polyamide film and its manufacturing method. The mentioned method can implement symmetrical corona discharge treatment to the film simply and generating electrostatic disorder hardly as well as without jerkwater treatment spot when changing the surface performance of the polyamide film. The mentioned polyamide film takes measuring point with interval of 10cm in width direction, and takes the mentioned measuring point as center, and to measure the contacting angle of the polyamide film relative to water with interval of 2mm in width direction using ten measuring points, setting the temporality maximum as Theta 1 max and minimum as Theta 1 min and average as Theta 1 av, moreover, setting the maximum of Theta 1 av of all measuring points as Theta 2 max and the minimum as Theta 2 min, all the measuring points meet the following formula 1 and formula 2, and formula 3. Theta 1 max -Theta 1 min <= 5deg (formula 1); 45deg <= Theta 1 av <= 55deg (formula 2); Theta 2 max-Theta 2 min <=5deg (formula 3).

Description

technical field [0001] The invention relates to a surface-modified polyamide film and its manufacturing method, in particular to a surface-modified polymer film through corona discharge treatment and its manufacturing method. Background technique [0002] In polymer films, characters and patterns are frequently printed on the surface, and printability of the surface is required. However, in general, the surface of a polymer film is mostly hydrophobic, and therefore, the surface of the polymer film can be modified by surface treatment. [0003] Conventional surface treatment methods for polymer thin films include methods of imparting hydrophilicity to the surface by discharge treatment such as plasma discharge treatment, corona discharge treatment, and flame treatment to improve printability. Alternatively, a method of forming a drug coating having a hydrophilic group on the surface of a film, etc. may be mentioned. Among them, plasma discharge treatment and corona discharg...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L77/00B29C71/04
Inventor 木原澄人
Owner UNITIKA LTD