JP2002119902A - Coating method and coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating method and a coating apparatus capable of preventing productivity from being lowered due to the work for changing the doctor blade upon a change in physical properties of ink when stripe coating is performed by metering a coating fluid by means of a transfer roll and a doctor blade. SOLUTION: The unevenness of the thickness in the direction of width is controlled by using a doctor blade 3 having a notch A for adjusting the total coating weight and in addition a notch B for controlling the unevenness of the thickness of a stripe in the direction of width and regulating the angle of the doctor blade. The doctor blade does not need to be changed even when the ink physical properties of ink are changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of applying ink to a running film or sheet-like base material in the form of stripes, and is mainly used for magnetic recording such as admission tickets and air tickets for automatic ticketing. The present invention relates to a coating technique suitably used for applying a magnetic ink in a process of manufacturing a medium.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Sho 56-2406 discloses a coating method for performing such a stripe-shaped coating.
Japanese Patent Application Laid-Open No. 4 (1999) -175 discloses a method in which a coating solution is measured by a transfer roll and a doctor blade, and the coating solution is applied to a support in a stripe shape. In the method described in this publication,
In order to suppress the swelling of the coating liquid at the periphery of the stripe, a doctor blade having such a shape that both end portions can be thinly measured in advance is used in the coating liquid measuring section of the doctor blade and the transfer roll.

[0003]

In the coating method described in the prior art, when the ink properties such as viscosity change due to a change in product specifications or the like, the shape of the notch of the doctor blade is newly adjusted. There was a problem that it had to be fixed.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to measure a coating liquid with a transfer roll and a doctor blade to perform coating in the form of a stripe when performing coating in a stripe form. An object of the present invention is to provide a coating method and a coating apparatus which can prevent a decrease in productivity due to a replacement operation of a doctor blade even when physical properties are changed.

[0005]

In order to solve the above-mentioned problems, a coating method of the present invention measures a coating liquid by a transfer roll and a doctor blade, and applies the coating liquid to a running film or sheet base material. In the coating method of applying in a stripe shape, in addition to the notch for adjusting the entire application amount, use a doctor blade with a notch for adjusting the thickness unevenness in the width direction of the stripe, and adjust the doctor blade angle By doing so, the thickness unevenness in the width direction is adjusted.

The coating apparatus used in the above-mentioned coating method is a coating apparatus which measures a coating liquid with a transfer roll and a doctor blade and applies the coating liquid to a running film or sheet substrate in a stripe form. A doctor blade having a notch for adjusting the thickness unevenness in the width direction of the stripe in addition to the notch for adjusting the entire coating amount is used for the doctor blade, and a doctor blade is provided near a boundary between both the notches. The rotation center of the blade is provided.

[0007]

1 and 2 show an example of a coating apparatus for carrying out a coating method of the present invention. FIG. 1 is a side view showing a schematic configuration of the coating apparatus.
FIG. 2 is a perspective view showing a schematic configuration of a doctor blade and its installation state.

As shown in FIG. 1, in this coating apparatus, the coating liquid of the ink pan 1 adheres to the transfer roll 2,
The excess coating solution adhering to the transfer roll 2 is measured by a doctor blade 3 and then transferred to the transfer roll 2 and the support roll 4.
The coating liquid is transferred to a film-shaped or sheet-shaped substrate 5 traveling between the substrates.

As shown in FIG. 2, the doctor blade 3 has a notch B for adjusting the thickness unevenness in the width direction of the stripe, in addition to a notch A for adjusting the entire coating amount. The center of rotation C of the doctor blade 3 is provided near the boundary between the notches A and B.

Next, a method of adjusting the thickness in the width direction of the coating liquid applied in a stripe shape will be described. FIG.
FIG. 4A shows a case where the vicinity of the center in the width direction of the coating solution I applied in a stripe shape is thin. In such a case, FIG.
The doctor blade 3 is rotated around the rotation center C from the position shown in FIG. 4 to the position shown in FIG. Thereby, the projection area Sa of the notch A in the radial direction of the transfer roll 2 is obtained.
Is maintained, the projected area Sb of the notch B in the radial direction of the transfer roll 2 can be changed, and the thickness in the width direction can be corrected as shown in FIG. If the thickness near the center is too large, the reverse operation may be performed.

The shape of the notch A for adjusting the entire coating amount is rectangular, but the shape of the notch B for adjusting thickness unevenness is not limited to the rectangular shape shown in FIG. 5 (b), (c), etc., can be appropriately selected from various shapes.

FIG. 6 is a perspective view showing a specific example of the coating apparatus. In this coating apparatus, the doctor blade 3 is moved in the direction of arrow D by the doctor holder 6 to adjust the reference coating amount. 3 is rotated about its rotation center C to correct the thickness in the width direction.

[0013]

As described above, according to the present invention,
Even if the ink properties such as viscosity change due to changes in product specifications, etc., the width of the coating liquid applied in a stripe pattern can be adjusted by adjusting the angle with the doctor blade attached. In addition, it is possible to prevent a decrease in productivity due to the replacement work of the doctor blade.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a coating apparatus for performing a coating method of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of a doctor blade and its installation state in a coating apparatus.

FIG. 3 is an explanatory diagram showing a coating state of a coating liquid before and after adjusting a thickness in a width direction.

FIG. 4 is an explanatory diagram of a method for adjusting a thickness of a coating liquid in a width direction.

FIG. 5 is an explanatory view showing an example of a notch provided in a doctor blade.

FIG. 6 is a perspective view showing a specific example of a coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink pan 2 Transfer roll 3 Doctor blade 4 Support roll 5 Base material 6 Doctor holder A, B Notch C Rotation center Sa, Sb Projection area

Claims (2)

[Claims] 1. A coating method for measuring a coating liquid with a transfer roll and a doctor blade and applying the coating liquid in a stripe shape to a running film-like or sheet-like base material. In addition, a coating method using a doctor blade with a notch for adjusting the thickness unevenness in the width direction of the stripe, and adjusting the width direction thickness unevenness by adjusting the angle of the doctor blade. 2. A coating apparatus for measuring a coating liquid by a transfer roll and a doctor blade and applying the coating liquid in a stripe shape to a running film-like or sheet-like base material. In addition to the notch for adjusting the width, the doctor blade with a notch for adjusting the thickness unevenness in the width direction of the stripe is used, and the center of rotation of the doctor blade is provided near the boundary between both notches. Coating equipment.