JPH081080A - Gradation coating method - Google Patents

Abstract

PURPOSE:To enable various shaped gradation coating and to show high gradation even when the film is thick by changing continuously or stepwisely coating quantity vertically to the coating direction. CONSTITUTION:A coating solution supply surface 3 is horizontally planar and the gradation coating is executed so that the coating surface is inclined to a medium to be coated as shown by the arrow by inclining a slide type coating device 1 at the angle of theta in the vertical direction (x) to the coating direction (z) and sliding the coating device 1 in the direction of (z). Where, a low viscosity coating solution possibly arises the uniformization of the surface after coating and then, is rapidly hardened by the use of an EB setting resin or the like. As a result, the various shaped gradation coating is executed and high gradation is shown even when the film is thick, which is difficult in gravure system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a printing field for light control films for lighting, windows, etc., wallpaper, molded products, designing of home appliances, etc., continuously or in the direction perpendicular to the coating direction. The present invention relates to a gradation coating method in which the coating amount is changed stepwise.

[0002]

2. Description of the Related Art Conventionally, when gradation coating is applied to a medium to be coated such as paper or resin film, it is general to use a plate having gradation. However, this method has various drawbacks. First, in the coating method that requires a plate, one plate is required to print one gradation pattern, and therefore, in order to perform several types of gradation coating, that number of plates is required, It was very uneconomical. Further, the offset printing is a method of controlling the dot size to form an area gradation, and is not suitable for gradation expression. Also, the gravure method is a method that controls the amount of ink adhered per unit area by the depth of the cell, so it is a method that is more suitable for gradation expression than the offset method, but there is a limit to the coating amount, It has a drawback that the resolution decreases as the coating amount increases.

The present invention solves the above problems and provides a gradation coating method which enables gradation coating of various shapes and enables high gradation expression even with a considerably thick film thickness. That is the purpose.

[0004]

Therefore, the gradation coating method of the present invention is characterized in that the coating amount is changed continuously or stepwise in the direction perpendicular to the coating direction. As an embodiment, a slide type coating device may be used, and the coating liquid supply surface may be inclined, or a shape having gradation may be provided on the coating liquid supply surface, or a slot type It is also possible to use a coating device so that the coating liquid supply port can be provided with a gradational shape.

[0005]

According to the present invention, various gradation coatings can be performed by making the coating liquid supply surface of the conventionally used slide type coating device inclined or changing the shape of the liquid supply port of the slot type coating device. I'm trying to get a face.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining one embodiment of a gradation coating method of the present invention, FIG. 1 (A) is a perspective view of a coating apparatus, and FIG. 1 (B) is a front view. In the figure, 1 is a slide type coating device, 2 is a coating liquid supply pipe provided below the coating device 1, 3 is a coating liquid supply surface provided above the coating device 1, and 4 is a coating liquid.

In this embodiment, the coating liquid supply surface 3 is a horizontal surface, and the slide type coating apparatus 1 is tilted at an angle θ in the vertical direction x with respect to the coating direction z, and the coating apparatus 1 is moved to z.
By sliding in the direction, gradation coating is performed on the medium to be coated so that the coating surface is inclined as shown by the arrow in the figure. Therefore, by changing the tilt angle, a coating surface having a considerably large film thickness, which was difficult in the gravure method, can be formed by using this method, and thus high gradation expression can be performed. It should be noted that with a coating liquid having a low viscosity, there is a possibility that the surface may become uniform after coating.
Immediate curing using a B-curing resin or the like is also effective. In addition, it is preferable to perform design printing or vapor deposition on or below the obtained gradation coating layer to enhance the design.

FIG. 2 is a front view of a coating apparatus for explaining another embodiment of the gradation coating method of the present invention. In this embodiment, the coating liquid supply surface 3 has a spherical shape as shown in FIG. 2 (A) or a stepwise shape as shown in FIG. 2 (B) to have a gradational shape. As a result, gradation coating with a spherical or stepped coating surface is performed on the medium to be coated. In addition, the coating liquid supply surface 3 may be provided with an inclined surface so that the same gradational gradation coating as in FIG. 1 may be performed, and the coating liquid supply surface 3 may be uniform or non-uniform. It is also possible to perform stripe-shaped gradation coating by forming a convex portion on.

FIG. 3 is a front view of a coating apparatus for explaining another embodiment of the gradation coating method of the present invention. In this embodiment, an example of the slot type coating device 5 is shown, in which the manifold 6 is connected to the liquid supply pipe 2 and the manifold 6 is rotated as shown by an arrow in the figure. By making the cross-sectional shape of the liquid supply port 7 of the manifold 6 inclined, gradation coating with an inclined coating surface is performed on the medium to be coated. The liquid supply port 7
It is also possible to perform gradation coating in a spherical shape, a step shape, or a stripe shape by forming the cross-sectional shape of (1) to have a gradation as in the above-described embodiment.

Next, specific examples of the present invention will be described. [Example 1] Coating liquid Sumipec MHO (manufactured by Sumitomo Chemical Co., Ltd.) 15 parts by weight MEK 84.85 parts by weight KAYASET BLUE 714 (manufactured by Nippon Kayaku Co., Ltd.) 0.15 parts by weight Coating liquid viscosity 14 cP PET using the slide type coating device of No. 1
A film (50 μm thick) was coated under the following conditions and dried. Liquid supply amount 200 ml / min Coating speed 10 m / min Width direction inclination angle 1 degree Coating width 160 mm As a result, a coating film with an average coating amount of about 10 g / m ² showing a stepwise color difference in the width direction was obtained. I was able to get it.

Example 2 Coating liquid Gelatin 13.64 parts by weight LIONOL BLUE ES 1.36 parts by weight PEREX OT-P (manufactured by Kao) 0.20 parts by weight water 84.8 parts by weight Coating liquid viscosity 40 cP (50 ° C.) This coating liquid was applied to PET using the slide type coating device of FIG.
A film (50 μm thick) was coated under the following conditions and dried. Coating liquid temperature 50 ° C. Liquid supply amount 400 ml / min Coating speed 10 m / min Width direction inclination angle 2 degrees Coating width 260 mm As a result, there is a gradual color difference in the width direction, average coating amount about 25 g / m A coating film of ² could be obtained.

[Example 3] Coating liquid KAYARAD DPHA (manufactured by Nippon Kayaku Co., Ltd.) 30 parts by weight Aronix M-120 (manufactured by Toagosei Co., Ltd.) 69.70 parts by weight KAYASET BLUE 714 (manufactured by Nippon Kayaku Co., Ltd.) 0.30 parts by weight Coating liquid viscosity 10 cP This coating liquid was applied to PET using the slide type coating device of FIG.
A film (50μm thick) is coated under the following conditions and EB is applied using a curtain beam type EB irradiation device.
And cured. Liquid supply amount 200 ml / min Coating speed 10 m / min Width direction inclination angle 0.5 degree Coating width 260 mm EB condition 175 KV, 5 Mrad As a result, stepwise color difference in width direction is seen, average coating amount about 10 g / A coating film of m ² could be obtained.

[Example 4] Coating liquid Sumipec MHO (manufactured by Sumitomo Chemical Co., Ltd.) 20 parts by weight MEK 79.80 parts by weight KAYASET BLUE 714 (manufactured by Nippon Kayaku Co., Ltd.) 0.20 parts by weight Coating liquid viscosity 40 cP The liquid is PET coated using the slot type coating device of FIG.
A film (50 μm thick) was coated under the following conditions and dried. Liquid supply amount 300 ml / min Coating speed 20 m / min Liquid supply port shape Sloping surface with 0.5 mm height on one side and 0.25 mm height on the other side Coating width 300 mm As a result, there is a stepwise difference in color tone in the width direction. It was possible to obtain a coating film with an average coating amount of about 10 g / m ² .

[0014]

As is apparent from the above description, according to the present invention, gradation coating of various shapes is possible, and
High gradation expression is possible even with a considerably thick film thickness, which was difficult with the gravure method.

[Brief description of drawings]

FIG. 1 is a view for explaining one embodiment of a gradation coating method of the present invention, FIG. 1 (A) is a perspective view of a coating apparatus, and FIG.
(B) is a front view.

FIG. 2 is a front view of a coating apparatus for explaining another embodiment of the gradation coating method of the present invention.

FIG. 3 is a front view of a coating apparatus for explaining another embodiment of the gradation coating method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sliding type coating device, 2 ... Coating liquid supply pipe, 3 ... Coating liquid supply, 4 ... Coating liquid 5 ... Slot type coating device, 6 ... Manifold, 7 ... Liquid supply port

Claims (4)

[Claims] 1. A gradation coating method characterized in that the coating amount is changed continuously or stepwise in the direction perpendicular to the coating direction. 2. The gradation coating method according to claim 1, wherein the coating liquid supply surface is inclined by using a slide type coating device. 3. A slide type coating device is used, and a gradational shape is provided on the coating liquid supply surface.
The gradation coating method described in. 4. A slot type coating device is used, and the coating liquid supply port is provided with a gradational shape.
The gradation coating method described in.