JPH06344532A - Screen printing plate engraving method - Google Patents

Abstract

PURPOSE:To obviate the necessity of laminating a heat fusion perforable film with a screen gauze at each time and carry out the bonding in a short time by impregnating with an adhesive through a solid engraved position, curing it and tensioning fixedly a sheet to a screen frame. CONSTITUTION:When a printing image is perforated, a position to be bonded to a peripheral screen frame is solidly engraved in the same shape as that of the frame. An adhesive is impregnated from a film surface side to the frame and cured in a state that the engraved screen sheet is brought into tension contact with the frame, and the sheet is fixed to the frame. The used suitable adhesive is, for example, vinyl acetate resin, polyester resin, or urethane resin. The adhesive spreading amount is of the degree which may laminate a heat fusion perforable film with a screen gauze by a strength without actual problem. Normally, it is sufficiently 2g/m<2> or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to screen printing and screen printing, and more particularly to a heat-sensitive screen printing using infrared rays or a thermal head and screen printing using the same.

[0002]

2. Description of the Related Art Usually, a screen plate is made by tensioning a screen gauze made of polyester or the like on a screen frame,
After the photosensitive resin is coated on the gauze and dried, or after the photosensitive resin film is attached to the gauze, a positive film having a printing pattern is superposed thereon and photocured (exposure step),
Then, the photosensitive resin in the unexposed portion is washed and removed with water (developing step).

Alternatively, after screen-making the photosensitive resin film or the heat-meltable perforable resin film by the above-mentioned exposure and developing process or the process of perforating with a thermal head, the plate is attached to a screen gauze which is fixed in tension to a screen frame in advance. Methods are also known.

[0004]

However, in the above-mentioned conventional method, there is a problem that the work is complicated because it is necessary to attach the film and the gauze to each plate making.

That is, in order to simplify the plate-making process, it is preferable to use a sheet in which a film and a gauze are bonded together in advance, but in that case, since the film has no air permeability, the above sheet is used as an adhesive. When fixing to the screen frame, there is a problem that it takes time to dry the adhesive and workability is poor. In addition, since the gauze is pasted with the adhesive applied to the screen frame in advance, it is difficult to replenish the adhesive when it is too much or when it sticks out of the frame when there is too much adhesive. There is a problem that is.

[0006]

The present invention provides a heat-sensitive screen sheet comprising a screen gauze and a hot-melt pierceable film laminated, and a stick-preventing layer on the film, and a screen frame of the sheet. The part to be attached to the printed image is solid-printed by heat-sensitive perforation around the printed image, and then the film side of the sheet is made to be the printed product side so that tension is applied to the screen frame and the adhesive is permeated and cured through the solid plate-making part. The present invention provides a screen plate making method characterized by a screen plate making method characterized by tensioning and fixing the sheet to the screen frame, thereby solving the above problems.

[0007]

In the present invention, a heat-sensitive screen sheet prepared by laminating a screen gauze and a hot-melt perforating film in advance is prepared. Since this screen sheet can be manufactured collectively, it is not necessary to bond the screen gauze and the heat-meltable film each time the plate is made.

The hot melt perforable film may be, but not limited to, a polyester film, a polyester copolymer film, a vinyl chloride film, a polypropylene film, a vinyl chloride / vinylidene copolymer film and the like. The thickness of the film is 1.0μ
It is preferably about 7.0 μm.

On the other hand, it is necessary that the screen gauze has substantially no piercing property when heated and allows the ink to pass during printing. For example, gauze such as polyester, silk, cotton, nylon, rayon, and stainless steel having a mesh size of about 50 to 300 mesh can be preferably used.

The screen gauze and the hot-melt perforable film are
Usually, they are bonded together with an adhesive. Adhesives used for this purpose include, for example, vinyl acetate resin, vinyl chloride / vinyl acetate copolymer resin, polyester resin, urethane resin, polyamide resin, chlorinated polypropylene resin, acrylic resin, styrene resin, styrene / maleic acid. resin,
Some are made of polyvinyl alcohol resin or the like. The resin is not limited to these, but it is necessary to select a resin that does not dissolve in the solvent of the screen printing ink used. The amount of adhesive to be applied may be such that the heat-meltable perforated film and the screen gauze can be bonded to each other with practically no problem. Usually, a sufficient 2 g / m ² or less, generally in the range of 0.3g / m ² ~1.6g / m ² is preferred.

The screen sheet on which the screen gauze and the hot-melt perforable film are laminated is perforated by perforating a predetermined printed image with infrared rays or a thermal head. In the case of perforating with a thermal head, it is preferable to provide a stick preventing layer having releasability on the hot-melt perforating film that comes into contact with the thermal head. The stick-preventing layer can be formed by applying a stick-preventing agent such as a surfactant-based, silicone-based, or fluorine-based stick-resistant agent to the hot-melt pierceable film. If necessary, other additives such as a heat-sensitive colorant, a colorant, an antistatic agent and a lubricant may be added to the stick prevention layer.

When the printed image is perforated, the surrounding area to be attached to the screen frame is simultaneously or separately formed into a solid plate with the same shape as the frame. With this, the adhesive can be permeated and cured from the film surface side into the screen frame in a state where the screen sheet produced by plate making is brought into tension contact with the screen frame, and the sheet can be fixed to the frame. If you make only the printed image and paste it on the screen frame, it is necessary to apply the adhesive to the frame in advance and bond the sheet, and the air permeability of the sheet is poor, so the adhesive dries slowly. In addition, there is a drawback that the adhesive sticks out of the frame and spreads to unnecessary parts, and it cannot be added when the adhesive is insufficient, but when the adhesive is permeated from the film surface side as described above. Does not suffer from these drawbacks.

The adhesive for adhering the heat-sensitive screen sheet to the screen frame as described above is water-soluble, solvent-based,
Any adhesive such as a hot melt type, a thermosetting type, or an ultraviolet curing type can be used, and it can be used without particular limitation as long as it has an adhesive force capable of holding the tension applied to the heat-sensitive screen sheet. .

[0014]

【Example】

Example 1 A heat-shrinkable polyester film having a thickness of 2.0 μ and a polyester 23 denier, 120 mesh screen printing gauze were used as a non-volatile component of vinyl chloride / vinyl acetate copolymer system at 0.5 g / m ^{2 was} used and pasted together. Furthermore, on the heat-shrinkable polyester film, a silicone acrylic graft copolymer resin of 0.05 g /
A thermal sensitive screen sheet was obtained by coating so as to have a deposition amount of m ² . An EL5500 thermal printer manufactured by Silver Seiko Co., Ltd. was used to make a plate on the printed image portion and a solid plate having the same shape as the screen frame around the printed image on this thermal screen sheet. A screen frame was prepared by permeating and curing an acrylic adhesive of 20 g / m ² from the solid plate-made part in the same shape as the printing frame, while pulling it with an air cylinder at a tension of 1.0 kg / cm in both the vertical and horizontal directions. To obtain a heat-sensitive screen plate. Ten minutes after the adhesive was applied and penetrated, practically sufficient adhesive strength was obtained. As a result of attaching this thermal screen plate to a simple screen base and applying pressure to the PVC plastic sheet with water-based screen ink with squeegee,
A clear printed image was obtained.

Comparative Example 1 A heat-shrinkable polyester film having a thickness of 2.0 μ, a polyester 23 denier, 120 mesh screen printing gauze was used as a non-volatile component of a vinyl chloride / vinyl acetate copolymer adhesive. It was stuck using 0.5 g / m ² . Furthermore, on the heat-shrinkable polyester film, a silicone acrylic graft copolymer resin of 0.05 g /
A thermal sensitive screen sheet was obtained by coating so as to have a deposition amount of m ² . This heat-sensitive screen sheet was subjected to plate making of a print image portion with an EL5500 heat printer manufactured by Silver Seiko Co., Ltd. This was adhered to a screen frame preliminarily coated with an acrylic adhesive of 20 g / m ^{2 in} a state of being pulled by an air cylinder at a tension of 1.0 Kg / cm both in the longitudinal direction and the lateral direction to obtain a heat-sensitive screen plate. Ten minutes after the adhesive was applied to the screen frame, sufficient adhesive strength could not be obtained yet, and it took about 120 minutes to obtain the strength practically no problem. When this heat-sensitive screen plate was attached to a simple screen base and pressure was applied to the vinyl chloride plastic sheet with a water-based screen ink with squeegee pressure, the screen plate was found to be loose and the printed image was unclear.

[0016]

According to the present invention, it is not necessary to bond the hot-melt perforable film and the screen gauze each time, and the heat-sensitive screen sheet can be adhered to the screen frame in a short time, thus improving workability. Is good. In addition, since the tension applied to the sheet can be easily adjusted, the sheet can be attached to the frame in an optimal state, and there is an advantage that clear printing can be obtained. Further, there is an advantage that the conventional equipment for producing a screen printing plate can be used as it is.

Claims (3)

[Claims] 1. A heat-sensitive screen sheet, comprising a screen gauze and a heat-meltable perforated film laminated, and having a stick-preventing layer on the film, is prepared, and a portion where the sheet is attached to a screen frame is printed as an image. Of the sheet by heat-sensitive perforation, and then the film side of the sheet is applied to the printed matter side to bring it into contact with a screen frame by tension, and the adhesive is permeated and cured through the solid plate-making site to form the sheet on the screen frame. A screen plate making method characterized in that the screen plate is tensioned and fixed. 2. A screen printing method using the screen printing plate obtained by the method according to claim 1. 3. A heat-sensitive screen sheet for use in the method according to claim 1, comprising a screen gauze and a hot-melt pierceable film laminated, and having a stick-preventing layer on the film.