JPH11222782A - Plate making of thick-film printing plate for screen printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for making a printing plate for screen printing excellent in durability capable of carrying out the thick printing even by using a usual ink regardless of a water-based or an oil-based ink. SOLUTION: A unit photosensitive layer forming step for thinly and uniformly recoating the surface of a gauze 11 supported on a frame 10 so as not to cause slackness with an ultraviolet curing resin plural times in a dark room and subsequently drying the resultant layer is repeated many times and the unit photosensitive layer is laminated until a desired thickness attains. Thereby, photosensitive layers 3 and 4 are formed and an original plate is then superimposed on the photosensitive layers 3 and 4. The superimposed layer is further irradiated with ultraviolet rays to dissolve and remove an uncured part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making a thick printing plate for screen printing, which is used for making a thick print on the surface of cloth, leather or other materials.

[0002]

2. Description of the Related Art When printing a thick print on cloth or leather, conventionally, a printing plate is used in which a plastic thin plate or the like from which a predetermined shape is removed is put on a gauze and the screen is formed by bonding. However, since the thin plate is inferior in durability such as easily peeling off from the gauze, the printing plate itself must be periodically replaced with a new one before the printing plate is damaged,
Since the printing plates have to be made one after another according to the number of printed sheets, there is a problem that the production cost increases.

This printing plate is suitable for printing with water-based ink. However, when this printing plate is used for printing with oil-based ink, the screen rapidly deteriorates depending on the material of the adhesive or thin plate. There was a problem that it became impossible. In the field of screen printing, it is common to produce a printing plate by a photographic method using a photosensitive film.

[0004] In the plate making by this photographic method, an ultraviolet-curable resin is applied to a screen stretched in a frame to form a thin film having a thickness of about several microns, and the original is placed thereon and irradiated with ultraviolet light. The ultraviolet curing resin in a region not cured by the shadow of the original is dissolved and removed with a solvent or the like. Although this printing plate is excellent in practicality, when using this printing plate,
Thick prints cannot be made by ordinary methods.

[0005] Even with this printing plate, a special ink which foams by heating is used, and after the printing, a heat treatment is performed to foam the ink, the printed portion is raised, and a thick print can be obtained. However, there are problems in that the method is special and has many restrictions, and since it must be heated after printing, the production cost increases and the texture of the print is limited.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a print having a large thickness even when ordinary ink is used irrespective of aqueous or oily properties. It is an object of the present invention to provide a method of making a thick film printing plate for screen printing, which is excellent in durability and can be applied.

[0007]

An object of the present invention is to provide a unit photosensitive layer forming step of applying a thin layer of an ultraviolet-ray effect resin in a dark room a plurality of times in a dark room and drying it on the surface of a screen supported by a frame so as not to loosen. Is repeated a number of times to form a photosensitive layer by laminating the unit photosensitive layers until the desired thickness is reached, overlaying the original on the photosensitive layer, irradiating ultraviolet rays, and dissolving and removing the photosensitive layer that has not been photocured with hot water. Achieved by

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory sectional view showing a flow of a plate making method of a thick film printing plate for screen printing according to the present invention. FIG.
Among them, 1 is a mold, 3 and 4 are photosensitive layers, 5 is an original plate, 6 is a mercury lamp, 7 is a nozzle for jet water flow, and 8 is glass for a printing stand.

The mold 1 has a square frame 10 on which one side of a gauze 11 is adhered without loosening. As gauze 11,
Examples include, but are not limited to, meshes made of Tetron or polyester, for example, Hanasasa. In addition, gauze 1
Any means may be used as the means for attaching 1, such as bonding with an adhesive, fusion bonding, and mechanical bonding, as long as the gauze 11 can be easily prevented from coming off the frame 10.

The mold 1 is carried into a dark room, and an ultraviolet curable resin is uniformly and thinly applied to the surface of the gauze 11 with a brush. Examples of the ultraviolet curable resin include the following, but are not limited thereto.

(1) Trade name: EX220 (AZOFIX)
2200) Characteristics: Solvent resistance, resin type B. A. UV resin, polyvinyl acetate, diazo (2) Trade name: EX200S (Accuret S) Characteristics: solvent resistance, resin type Component: P.S. B. A. UV resin, polyvinyl acetate, diazo (3) Trade name: SD90A Characteristics: water resistance Component: P.I. V. A. , Polyvinyl acetate, diazo (4) Trade name: AF-120 (AZOFIX200) Properties: solvent resistance (vinyl acetate type) Component: P.I. V. A. , Polyvinyl acetate, diazo (5) Trade name: Supercoat (OH-201) (high-sensitivity thick film photosensitive emulsion) Viscosity (25 ° C): solid content 37.5 ± 2.5 WT% PH (25 ° C): 5.0 ± 0.5 Ingredients: water-soluble polymer, polyethylene, vinyl acetate, polyvinyl acetate, acrylic resin, photosensitizer, pigment

When this coating operation is repeated, for example, 10 to 20 times, the applied ultraviolet curable resin is completely dried to form a unit photosensitive layer, and the step of forming the unit photosensitive layer is performed a plurality of times, for example, 10 to 30 times. This process is repeated twice to form photosensitive layers 3 and 4 each having a thickness of about 2 to 3 mm.

When the photosensitive layers 3 and 4 have a predetermined thickness and are completely dried, the master 5 is placed on the glass 8 of the printing stand, and the photosensitive material of the frame 1 is further superimposed thereon. Then, the photosensitive layers 3 and 4 in the exposed portions are cured. This exposure time is usually about 20 to 30 minutes.

When the exposed photosensitive layers 3 and 4 are completely polymerized and cured, the uncured portions are dissolved and removed with hot water and developed.
In this case, various methods can be adopted, but one of the recommended methods is to dissolve and remove the resin in the uncured portion with a brush or the like containing hot water. In this manner, development can be performed without damaging the gauze and the photosensitive portion.

[0015] At least the operation of removing the uncured portion is performed in a dark room. When the removal operation is completed, the photosensitive layers 3 and 4 remaining on the surface of the gauze 11 are sharpened by jet spraying from the jet nozzle 7, and the edges are smoothed. The printing plate obtained by the above method has excellent durability because the gauze 11 and the photosensitive layers 3 and 4 are completely integrated.

In the present invention, a step of forming a unit photosensitive layer by applying a thin layer of an ultraviolet curable resin on the surface of a gauze and drying it is repeated a plurality of times to provide a photosensitive layer having a predetermined thickness, and a screen is formed by a photographic method. It is characterized by comprising. Therefore, the present invention is not limited to the above embodiments. For example, the gauze may be any as long as it can be used for screen printing, and the shape of the frame is not limited to a square, but may be a mercury lamp. May be any light-emitting device that can cure the photosensitive agent used, and the edge of the photosensitive layer left on the surface of the gauze may be trimmed by means other than jet water flow. The type of the ultraviolet curable resin, the number of times of application, the thickness of the photosensitive layer, the ultraviolet irradiation time, and the like can be freely changed within the scope of the object of the present invention. It is intended to cover all modifications that can be easily conceived by those skilled in the art.

[0017]

According to the present invention, the method for making a thick film printing plate for screen printing according to the present invention is constituted as described above. Therefore, according to the present invention, it is used for printing thick prints and has excellent durability. Printing plate can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a flow of a plate making method for a thick film printing plate for screen printing according to the present invention.

[Explanation of symbols]

 1 ... mold 10 ... frame 11 ... gauze 3 ... photosensitive layer 4 ... photosensitive layer 5 ... original plate 6 ... mercury lamp 7 ..... Jet nozzle 8 ..... Glass

Claims (5)

[Claims] 1. A frame (10) is covered with a gauze (11) and a mold (1)
And a step of forming a unit photosensitive layer in which an ultraviolet curable resin is applied thinly and uniformly on the surface of the gauze (11) in a dark room a plurality of times and dried, and the unit photosensitive layer is formed to a desired thickness. A photosensitive layer (3, 4) having a desired thickness, a master layer (5) is superimposed on the photosensitive layer (3, 4), an exposure step of irradiating ultraviolet rays, and photo-curing. A developing step of dissolving and removing the uncured ultraviolet curable resin with hot water, and a method of making a thick film printing plate for screen printing. 2. The method according to claim 1, wherein the developing step includes a step of shaping the edge of the photocured ultraviolet curable resin pattern with a jet stream. 3. The thickness for screen printing according to claim 1, wherein the number of repetitions of thinly coating the surface of the gauze (1) with the ultraviolet curable resin in the unit photosensitive layer forming step is 10 to 20 times. Plate making method of membrane printing plate. 4. The photosensitive layer forming step wherein the number of repetitions of the unit photosensitive layer forming step is 10 or more and 30 or less.
4. The method of making a thick film printing plate for screen printing according to any one of the above items 3 to 3. 5. The photosensitive layer (3, 4) has a thickness of 2 mm on one side.
The method of making a thick film printing plate for screen printing according to any one of claims 1 to 4, which is at least 3 mm or less.