JPH0890894A - Screen printing method and printing screen for use in this and its production - Google Patents

Abstract

PURPOSE: To obtain print gradation, by varying the thickness of a coating of a printing material in screen printing as onto a tile. CONSTITUTION: In screen printing using a printing screen 14 with a mask material 18 in a specified pattern, the thickness of a coating of a printing material 20 spread over the surface of a tile 10 is varied with the thickness of the mask material 18. In this printing method, the thickness of the coating of the printing material 20 is gradually changed by gradually changing the thickness of the mask material 18, and thus varying print gradation from high to low gradually or in succession.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing method, a printing screen used therefor, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a printing material is placed on a printing screen 102 formed by applying a mask material 100 in a predetermined pattern, and the printing material is passed through an opening of a screen gauze 104 with a squeegee. A screen printing method in which the printing material 108 is extruded and the printing material 108 is applied in a predetermined pattern on the surface of the printing target 106 is widely used. For example, such a screen printing method is widely used also when forming a predetermined decorative pattern on the surface of a tile.

By the way, in the conventional screen printing, the thickness of the mask material 100 applied to the screen 102 is uniform, so that the thickness of the printing material 108 applied to the surface of the object 106 to be printed by one screen printing is also uniform. However, there is a problem in that it is not possible to give a shade to printing due to the change in the coating thickness.

Therefore, in the prior art, the density is increased or decreased by increasing or decreasing the number of halftone dots. In this method, however, there are few halftone dots in the light portion. In addition to the problem that halftone dots are visible to the naked eye, the coating thickness of the printing material is uniform, resulting in a three-dimensional effect.
There was a problem that the volume was poor.

Further, in the case of the conventional screen printing, it is difficult to apply the printing material 108 thicker than a certain amount in each printing, and particularly when thick printing is performed, the same printing operation is repeated many times. The printing thickness is made thicker in this case, and in this case, there is a problem in that printing takes a lot of time.

[0006]

The invention of the present application has been made to solve such a problem. Thus, the invention of the present application relating to the screen printing method, when performing the screen printing using the printing screen formed by applying the mask material in a predetermined pattern, to give the mask material a change in thickness in the same printing screen, Thus, the coating thickness of the printing material on the surface of the material to be printed is changed (claim 1).

Another invention of the present application is characterized in that, in the screen printing method according to claim 1, the thickness of the mask material is changed stepwise, whereby the coating thickness of the printing material is changed stepwise. Claim 2).

Yet another invention of the present application is the printing method according to claim 1 or 2, characterized in that the material to be printed is a tile (claim 3).

Still another invention of the present application relates to a printing screen, which is a printing screen used for screen printing, wherein a mask material is applied in a predetermined pattern and the thickness of the mask material is changed. (Claim 4).

Yet another invention of the present application is the printing screen according to claim 4, wherein the thickness of the mask material is changed stepwise (claim 5).

Still another invention of the present application relates to a method for manufacturing a printing screen, comprising: (a) coating a photosensitive emulsion on a screen gauze, overlaying a mask film and exposing it to cure the exposed part. After the reaction, the step of removing the unexposed portion is performed, and the step of applying a printing mask material having a predetermined pattern composed of the exposed and cured portion to the screen, and And a step of repeating the operation of increasing the thickness of the mask material once or twice or more (claim 6).

In still another invention of the present application, in the manufacturing method of claim 6, the mask film is used in the first or second and subsequent repeated operations in the step (b) for increasing the thickness of the mask material. As above (a)
It is characterized in that a pattern different from the above operation is used to change the thickness of the mask material of the printing screen.

[0013]

As described above, according to one aspect of the present invention, when the screen printing is performed, the thickness of the mask material in the printing screen is changed. It is possible to change the thickness of the printing material applied to the printing material, and thus it is possible to easily realize the shade of printing.

Since this light and shade is due to the change in the coating thickness of the printing material, there is no inconvenience that the halftone dots are visible to the naked eye in the light portion as in the conventional method, and the printing material is used. It is possible to give a three-dimensional effect and a volume effect to the printing based on the change in the coating thickness.
As a result, the texture of printing can be improved (claims 1 and 4).

Another invention of the present application is such that the thickness of the mask material is changed stepwise, and according to the present invention, the shade of printing can be changed stepwise. That is, the tone of printing can be a gradation tone, and therefore, according to the present invention, the touch of a brush can be faithfully transferred and expressed. Such a decorative pattern can be formed, and the texture of the decorative pattern can be effectively enhanced (claims 2 and 5).

Conventionally, in applying a decorative pattern to the surface of a tile by screen printing, a method for imparting a shade and a three-dimensional effect to the decorative pattern has been researched, but a sufficient method has not been provided, and therefore a book has not been provided. The invention is highly effective when applied to screen printing on such tiles (Claim 3).

Still another invention of the present application relates to a method for manufacturing a printing screen, which comprises coating a screen with a photosensitive emulsion, curing the photosensitive emulsion by exposing it with a mask film overlaid, By repeating the process including the removal of the unexposed portion at least twice, the thickness of the mask material in the printing screen is increased. In other words, the present invention is to increase the thickness of the mask material by stacking the mask material in each step, and by increasing the number of repetitions of the mask material, the mask material of the desired thickness is finally obtained. Can be formed.

In the present invention, it is also possible to increase the thickness of the mask material to a uniform thickness. In this case, the thickness of the printing material applied to the printing material can be increased to a certain level or more by one printing operation. Is possible. That is, thick screen printing can be performed by one screen printing.

According to claim 7, when the mask film used in the second and subsequent repeating steps has a different pattern from that of the first step, the number of times the mask material is laminated on the same printing screen is increased. Can be made different, and thus the thickness of the mask material can be changed. That is, by such a method, the thickness of the mask material on the printing screen can be easily changed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 3, reference numeral 10 is a tile having a decorative pattern 12 formed by screen printing on its surface. In this decorative pattern 12, the coating thickness of the printing material is gradually changed in the order of A → B → C → D → E → F, so that the printing density is gradually increased from A → F. Has changed from light to light.

FIG. 1 shows a tile 1 for forming a decorative pattern 12.
The screen printing method on the 0 surface is specifically shown.
In FIG. 1, 14 is a screen for printing and 16 is a screen.
The screen gauze 18 is a mask material fixed to the screen gauze 16. Here, the mask material 18 is a → b → c → d → e → f →
g and the thickness thereof is gradually changed from left to right in the figure.

Next, the screen printing method of this embodiment will be described. First, in the method of this example, the printing screen 14 is applied to the surface of the tile 10, and the printing material 20 (paste glaze in this example) is placed on the printing screen 14 and is screened by a squeegee. Mask material 18 and 1 of gauze 16
The printing material 20 is applied to the surface of the tile 10 by extruding through the openings between the tiles 10.

At this time, the coating thickness of the printing material 20 is set according to the thickness of the mask material 18. Specifically, the thickness decreases in the order of A → B → C → D → E → F.

Then, by firing it,
The decorative pattern 12 in which the printing density gradually changes from A to F from dark to light is obtained.

FIG. 2 shows an example of a method of manufacturing the printing screen 14 described above. First, in (I), a photosensitive film 22 is entirely applied to the screen gauze 16, and a positive film having a transparent portion 23 of a pattern corresponding to the decorative pattern 12 thereon is used as a mask film 24. Overlap
It is exposed to light.

Then, the photosensitive emulsion 22 in the transparent portion 23 undergoes a curing reaction upon exposure. Then, by removing the photosensitive emulsion 22 in the unexposed portion (uncured portion) with a solvent or the like, the mask material 18 is fixed on the screen gauze 16 in a predetermined pattern (II).

Next, the photosensitive emulsion 22 is again applied to the screen mesh 16 to which the mask material 18 is fixed by the first operation.
Is applied over the entire surface, a mask film 24 having a pattern different from that described above is superposed thereon and exposed, and then the photosensitive emulsion 22 in the unexposed portion is removed. In the second step ((III), (IV)), that is, in the second repeated operation, only a part of the mask material 18 can be laminated to increase the thickness.

By repeating this series of steps many times ((V), (VI) ...) The thickness of the mask material 18 can be changed stepwise, and finally the mask material 18 is formed.
It is possible to obtain a printing screen 14 in which the thickness of the printing ink changes from a → b → c → d → e → f → g.

Here, as the screen gauze 16, tetron thread, nylon thread, stainless thread, tetron-nylon coating thread, etc. can be used. Also screen
The mesh number of the mesh 16 may be 10 to 400 mesh. Furthermore, the tension of the screen 16 is 5
It can be 30 N / cm ² and also screen 1
Both normal tension and bias tension can be used for tensioning 6.

The photosensitive emulsion 22 is an aqueous emulsion,
Various materials such as oil-based diazo emulsions and oil-based resin emulsions can be used, and the mask material 18 has a thickness of 40 to 6
It can be set to 00 μm. Further, the viscosity of the printing material 20 used for screen printing is 50 to 30000 C · P (B
Type viscometer).

According to this example, the printing material 2 on the tile 10 is
It is possible to change the coating thickness of 0, which makes it possible to easily realize the shade of printing. Moreover, since the shading is based on the change in the coating thickness of the printing material 20, it is possible to give a three-dimensional effect and a volume feeling to the printing, thereby improving the printing quality.

In the present example, the thickness of the mask material 18 is changed stepwise, whereby the shade of printing can be changed stepwise. That is, the tone of printing can be a gradation tone, and therefore, according to this example, the touch of a brush can be faithfully transferred and expressed on the surface of the tile 10 to effectively enhance the texture of the decorative pattern 12. You can

Further, according to the method of manufacturing the printing screen 14 in this example, the photosensitive emulsion 2 on the screen mesh 16 is
The mask material 18 is laminated on the printing screen 14 by repeating at least two times the steps including the coating of 2, the curing reaction of the photosensitive emulsion 22 by the exposure with the mask films 24 stacked, and the removal of the unexposed portions. However, since the thickness is increased, the thickness of the mask material 18 can be freely changed in the same printing screen by increasing the number of repetitions of the process.

In the present invention, it is also possible to increase the thickness of the mask material 18 to a uniform thickness. In this case, the coating thickness of the printing material 20 on the tile 10 is set to a certain value or more in one printing operation. It can be thickened. That is, thick screen printing can be performed with one screen printing.

Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied to screen printing on a printing material other than tiles, and the above decorative pattern. Needless to say, it can be applied to the printing of various patterns and patterns other than No. 12, and various changes can be made without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing the steps of a screen printing method which is an embodiment of the present invention.

FIG. 2 is a diagram schematically showing the steps of a method for producing a printing screen used in the same example.

FIG. 3 is a perspective view of a tile provided with a decorative pattern by the screen printing method shown in FIG.

FIG. 4 is a diagram illustrating a conventional screen printing method.

[Explanation of symbols]

 10 Tile 14 Screen for Printing 18 Mask Material 20 Printing Material 22 Photosensitive Emulsion 24 Mask Film

Claims (7)

[Claims] 1. When performing screen printing using a printing screen formed by applying a mask material in a predetermined pattern,
A screen printing method characterized in that the mask material is changed in thickness in the same printing screen, and thus the coating thickness of the printing material on the surface of the printing object is changed. 2. The screen printing method according to claim 1, wherein the thickness of the mask material is changed stepwise, and thus the coating thickness of the printing material is changed stepwise. 3. The screen printing method according to claim 1, wherein the printing object is a tile. 4. A printing screen used for screen printing, wherein the mask material is applied in a predetermined pattern and the thickness of the mask material is changed. 5. The printing screen according to claim 4, wherein
A printing screen, wherein the thickness of the mask material is changed stepwise. 6. A method of manufacturing a printing screen, comprising:
(A) After coating the screen gauze with a photosensitive emulsion, the mask film is overlaid and exposed to cure the exposed part, and then the unexposed part is removed to give a predetermined part composed of the exposed cured part. Including a step of applying a pattern printing mask material to the screen, and (b) a step of repeating the same operation again to increase the thickness of the screen printing mask material once or twice or more. A method for manufacturing a printing screen, comprising: 7. The manufacturing method according to claim 6, wherein in the first or second and subsequent repeating operations in the step (b) for increasing the thickness of the mask material, the mask film of (a) is used. A method for manufacturing a printing screen, characterized in that a pattern having a pattern different from that of the operation is used, and thereby the thickness of the mask material of the printing screen is changed.