Method to improve apparent mass of film coating

A technology of surface quality and thin film coating, which is applied to the surface coating liquid device, coating, etc., can solve the problems of gravure roll surface groove and mesh clogging, paste roll, uneven coating thickness, etc. Achieve the effects of improving coating stability, lowering temperature, and good wetting effect

Inactive Publication Date: 2015-01-28
HEFEI LUCKY SCI & TECH IND +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to reduce the adverse impact on the environment, the current coating liquid tends to develop towards water-based coating liquid. During the gravure roll coating process, the gravure roll rotates at high speed to apply the coating liquid to the surface of the film. With the extension of production time, The temperature of the gravure roller surface continues to rise, which accelerates the volatilization of the water in the residual coating solution inside the groove of the gravure roller, and part of the solid components in the coating solution are separated out and agglomerated, resulting in clogging of the gravure roller surface grooves and meshes. Paste roller phenomenon occurs, which will lead to local or most of the coating film appearance, and the thickness of the coating film is uneven and fluctuates greatly, which makes the coating production unable to continue. In order to eliminate this effect, it is necessary to treat the surface of the gravure roll Cool and moisten

Method used

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  • Method to improve apparent mass of film coating
  • Method to improve apparent mass of film coating
  • Method to improve apparent mass of film coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present invention adopts known methods to prepare the coating liquid, and the water-based coating liquid is coated on the support body PET by a coating gravure roll, dried, and wound to obtain a coating film with a functional layer.

[0028] An ultrasonic humidifying device is arranged on the side where the coating gravure roll 6 returns to the liquid supply chamber, and the spray pipe of the device is arranged in front of the coating gravure roll 6 in the direction of motion, and the angle between the horizontal direction a of the gravure roll is 30°, and the distance h is 10 mm. place; the inner diameter of the spray pipe 4 is 20mm, and spray nozzles 5 with an aperture of 5mm and a hole spacing of 60mm are distributed on its surface. When the coating starts, turn on the power, adjust the frequency of the ultrasonic oscillator 2 to 1.0 MHz, and spray the water mist from the spray nozzle 5 to the surface of the coating gravure roll 6 through the spray tube 4 .

Embodiment 2

[0030] A coating liquid is prepared, and the water-based coating liquid is coated on a support PET by a coating gravure roll, dried, and wound to obtain a coating film with a functional layer.

[0031] An ultrasonic humidifying device is arranged on the side where the coating gravure roll 6 returns to the liquid supply chamber, and the spray pipe of the device is arranged in front of the coating gravure roll 6 in the direction of motion and at an angle of 40° to the horizontal direction a of the gravure roll, and the distance h is 15mm The inner diameter of the spray pipe 4 is 30 mm, and spray nozzles 5 with an aperture of 7 mm and a spacing of 70 mm are distributed on its surface. When the coating starts, turn on the power, adjust the frequency of the ultrasonic oscillator 2 to 1.2 MHz, and spray the water mist from the spray nozzle 5 to the surface of the coating gravure roll 6 through the spray tube 4 .

Embodiment 3

[0033] A coating liquid is prepared, and the water-based coating liquid is coated on a support PET by a coating gravure roll, dried, and wound to obtain a coating film with a functional layer.

[0034] An ultrasonic humidifying device is arranged on the side where the coating gravure roll 6 leaves the liquid supply chamber, and the spray pipe of the device is arranged in front of the coating gravure roll 6 in the moving direction, and the angle between the horizontal direction a of the gravure roll is 45°, and the distance h is 20 mm. The inner diameter of the spray pipe 4 is 35 mm, and spray nozzles 5 with an aperture of 9 mm and a spacing of 80 mm are distributed on its surface. When the coating starts, turn on the power, adjust the frequency of the ultrasonic oscillator 2 to 1.4 MHz, and spray the water mist from the spray nozzle 5 to the surface of the coating gravure roll 6 through the spray tube 4 .

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Abstract

A method to improve apparent mass a film coating includes the steps of: coating, drying and rolling. A humidifying device is arranged on at least one side of a gravure roller in the coating process; the device is composed of a water storage tank, an ultrasonic oscillator, a wind feeding device, a spray pipe and a spray nozzle; and the spray pipe and the gravure roller have a distance of 10-50 mm, and the ligature of the spray pipe axis and the gravure roll axis has an included angle with the horizontal direction of 30 to 60 DEG. The invention solves the problem that temperature rise of the roller surface causes accelerated volatilization of local coating liquid aqueous solution on the roller surface, which further causes solid precipitation; the method plays good wetting effect, avoids the phenomenon of paste roller caused by clogging of precipitated solid on the gravure roller surface groove and mesh, and improves the coating stability and apparent mass of film coating.

Description

technical field [0001] The invention relates to the technical field of thin films, in particular to a method for improving the apparent quality of thin film coating. Background technique [0002] In order to increase the use of optical films and broaden the field of application, it is necessary to endow or improve certain properties of the film material. One of the effective methods is to coat the surface of the film with a specially formulated functional coating, which is generally coated with a gravure roll. The grooves of the coating gravure roller are filled with a certain amount of coating liquid, the film is in contact with the surface of the gravure roller, and the two run in reverse to make the coating liquid in the groove of the gravure roller evenly coated on the surface of the film. After drying and curing, Made of functional membrane materials with specific functions. [0003] In order to reduce the adverse impact on the environment, the current coating liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C11/00
CPCB05C1/0808B05C11/00
Inventor 聂芳芳刘长丰王会荣
Owner HEFEI LUCKY SCI & TECH IND
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