JP2770589B2 - Embossing printing method by screen printing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emboss printing method by screen printing. More specifically, the present invention relates to a screen printing method which performs multi-color screen printing using a main plate having a fine mesh and then performs screen printing for multi-color printing using a sub-plate having a coarse mesh, which is excellent in a swelling effect.

[0002]

2. Description of the Related Art Conventionally, a screen printing method has been known as a printing method having a swelling effect. As a printing method for providing a swelling effect by this printing method, (1) printing in which multicolor printing such as four-color printing is performed using process ink on a printing plate having the same mesh, and further multicolor printing is performed using the same printing plate thereon. (2) There is known a printing method in which spot printing is performed on a picture portion of an offset print (multicolor printing using process ink) using a clear printing ink on a screen printing plate.

However, in a screen printing method using a printing plate having the same mesh, the amount of ink discharged by the used screen printing plate hardly changes. Further, in the screen printing method of performing spot printing on a picture portion, the glossiness of the picture portion is improved, but the effect of raising the height is not satisfactory.

A double tone method is known as a printing method. This printing method is a method in which two types of printing plates having different gradations, that is, different halftone dot ratios, are prepared from the same document, and printing is performed using different inks for each printing plate. Although this method is excellent in the tone reproduction effect, it is not satisfactory as the excitement effect.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screen printing method by screen printing which can obtain a printed material which is clear, has a raised effect and is excellent in a three-dimensional effect by improving the screen printing method.

[0006]

According to the present invention, multicolor screen printing is performed using a fine screen plate of 250 mesh or more, preferably 300 mesh or more as a main plate,
Next, there is provided a raised printing method by screen printing, which comprises performing multicolor screen printing using a coarse screen plate having a mesh size of 150 mesh or less, preferably 100 mesh or less as a sub-plate.

In the stencil printing method of the present invention, it is usual to perform three-color printing of yellow, red, and indigo for each of the main and sub-plates, and four-color printing with black ink as necessary.
The invention is not limited to these, and any multicolor printing may be performed.

[0008] In the plate making of the main plate and the sub plate, a positive film is prepared for each color using a plate making scanner.
Using the positive film, a main plate and a sub plate are prepared by a usual plate making method. The photosensitive emulsion used in plate making is not particularly limited, such as a light-sensitive emulsion and a diazo-type light-sensitive emulsion.However, a light-sensitive emulsion is preferable in terms of easy uniform coating of a thick screen on a coarse mesh screen. It is preferably used. Photopolymerizable emulsions are particularly preferred for subplates which play an important role in exhibiting the swelling effect.

The ink used for printing is not particularly limited as long as it is usually used for screen printing, such as an ultraviolet curable ink and a thermopolymerizable ink.
In addition, it is preferable to use a process ink as the main plate ink, and a subplate ink that can exert a swelling effect without impairing the halftone gradation of the printed matter.For example, pale color yellow, red, indigo is there. As a pale color ink, usually 20% by weight compared to the process ink
Hereafter, preferably 5% by weight or less of a pigment or dye is contained.

The printing substrate is not particularly limited as long as ordinary screen printing is applied, and is generally paper, plastic, metal or the like. Printing may be performed by a normal automatic or semi-automatic printing machine.

[0011]

The present invention will be described in more detail with reference to the following examples.

[0012]

EXAMPLE 1 A manuscript was photoengraved using a scanner to produce a printing plate film for a main plate of four colors and a sub-plate for yellow, red and indigo. From this film, a main plate of 305 mesh and a sub-plate of 70 mesh were prepared. Main plate and process ink (Toyo Ink Mfg. Co., Ltd., No. 21)
000 UV-curable ink) to produce a color print with a semi-automatic screen printer. Next, 2% by weight of the process ink was added to the transparent curable ink by using
Printing was performed using the added ink. Irradiation with ultraviolet light was carried out for each color to dry and cure.

The obtained printed matter was clear and had a raised effect of a raised thickness of 300 μm or more, and was excellent in three-dimensional appearance.

[0014]

According to the present invention, the normal ink film thickness by screen printing is about 12 .mu.m,
A printed matter having a thickness of 0 μm or more is provided. Further, according to the present invention, there is provided a printed matter which is clear and has a three-dimensional effect excellent in a swelling effect.

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Claims (2)

(57) [Claims] 1. A screen printing process in which multicolor screen printing is performed using a fine screen plate of 250 mesh or more as a main plate, and then multicolor screen printing is performed using a coarse screen plate of 150 mesh or less as a sub plate. Printing method. 2. The method according to claim 1, wherein the screen printing is performed by using a main plate and a sub plate composed of three or four plates of yellow, red, indigo and, if necessary, black.