JPH07214746A - Screen printing plate making apparatus and production of screen printing plate - Google Patents

Abstract

PURPOSE:To inexpensively and simply produce a screen printing plate and enable high-grade printing in proper printing density even when the number of printing papers is increased. CONSTITUTION:A printing base plate 1 consisting of a support layer 2 composed of a sheet excellent in resin absorbability and an image forming layer 3 on which a specific image pattern is drawn by a screen plate using a thermal element or the like is brought into close contact with the screen gauze 5 bonded to a printing frame 6 and a resin soln. 7 is spread over screen gauze 4 in uniform film thickness from the screen gauze 5 by a squeegee 8. The resin soln. 7 remains on the non-plate making part 3b of the printing base plate 1 as it is but penetrates into the expossed support layer 2 at a plate making part 3a to be absorbed therein. The resin soln. remaining on the non-plate making part 3b is irradiated with UV rays, exposed to light or naturally dried to be cured and the resin film of the pattern of the non-plate making part 3b is formed on the screen gauze 5 to form a screen printing plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing plate making apparatus for forming a screen printing plate and a method for manufacturing a screen printing plate.

[0002]

2. Description of the Related Art As a method for forming a plate for screen printing, a surface of a screen cloth stuck to a printing frame is coated with a photosensitive resin and dried, or a photosensitive film is stuck to the screen cloth. Thus, by exposing through a positive film on which an image of a predetermined pattern is formed to cure only the exposed portion and washing away the unexposed portion, a resin image pattern is formed on a screen gauze. Widely known.

[0003]

By the way, in the above-mentioned prior art, printing is performed by forming a positive film, laminating a photosensitive resin on a screen mesh surface, and performing each step of exposure and washing. The disadvantage is that it requires a very complicated process to form a printing plate. Therefore, in order to simplify the creation of screen printing plates,
The Applicant has developed a personal computer which enables direct production of a screen printing plate from an image produced by the personal computer. That is, a flexible laminated sheet is formed by laminating a thermosensitive resin film on a screen gauze, and the laminated sheet is mounted on a thermal printer connected to a personal computer to form a print head of this printer. The plate is produced by bringing the elements into contact with each other and punching the resin film portion of the laminate sheet by the heat of the heat-sensitive element. According to this method, a screen printing plate can be formed extremely easily, but it is still free from problems. First of all, since the resin film is attached to the screen gauze and perforated in the laminated film that is integrated, it is necessary to dispose of it once the image pattern is formed, and the screen gauze cannot be reused. There is a point. Further, the film slag generated at the time of heat perforation is easily entangled with the mesh of the screen gauze to easily cause clogging, and thus the printing ink is deteriorated at the time of printing, and when the number of printed sheets increases, the printing quality deteriorates, In addition, there is a drawback that uneven printing occurs.

The present invention is a screen printing plate making apparatus which is cheaper, can easily make a screen printing plate, and can perform high quality printing with an appropriate printing density even if the number of printed sheets is increased. And a method for producing a screen printing plate.

[0005]

In order to achieve the above-mentioned object, a screen printing plate making apparatus according to the first aspect of the present invention is characterized in that a resin-impermeable material is used in a support layer made of a sheet material having good resin absorbability. Of a printing material laminated with an image forming layer on which a desired image pattern is formed, a screen mesh superposed on the image forming layer side of the printing original plate, and a screen superposed on the printing original plate. It is characterized in that it is composed of a film-forming member which is coated on the gauze side, has good absorbability to the support layer, and is made of a resin liquid curable on the screen gauze surface.

Further, in the screen printing plate making apparatus according to the second aspect of the present invention, an image is formed by forming a desired image pattern by forming an adhesive impermeable member on a support layer made of a sheet material having good adhesive absorbency. A printing original plate in which forming layers are laminated,
A screen gauze that is superposed on the image forming layer side of the printing original plate, and an adhesive that coats the screen gauze side that is superposed on the printing original plate to adhere the image forming layer to the screen gauze. Is its characteristic.

Further, a third invention is a method for producing a screen printing plate, which comprises a support layer made of a sheet material having good resin absorbency and a resin impermeable member,
A printing plate forming step of forming a printing plate precursor comprising a laminate with an image forming layer on which a desired image pattern is formed, and a screen gauze bonding in which a screen gauze is superposed on the image forming layer side of this printing plate in a close contact state. A step, a uniform coating of the resin liquid from the screen side, the resin liquid of the plate-making portion of the image forming layer is absorbed by the support layer, and a film-forming step of forming a resin film-forming body in the non-plate-making portion, And a peeling step of peeling the printing original plate from the screen cloth.

A fourth invention relating to a method for producing a screen printing plate is an image in which a supporting layer made of a sheet material having a good adhesive absorbency and an adhesive impermeable member are formed to form a desired image pattern. A printing plate forming step of forming a printing plate by laminating a forming layer, a screen screen bonding step of superimposing a screen screen on the image forming layer side of the printing plate in a close contact state, and a bonding process from the screen screen side It is characterized in that it comprises an adhesion step of uniformly coating the agent and adhering the image forming layer to the screen cloth, and a peeling step of peeling the support layer.

[0009]

In the present invention, basically, a printing original plate comprising a support layer and an image forming layer is used, and an image pattern is formed on the screen cloth from the printing original plate. By using the printing original plate, by forming a resin film on the screen mesh surface of the pattern plate portion (film forming method), or by transferring the pattern plate portion in the image forming layer to the screen mesh (transfer method), Form a screen printing plate.

In the film forming method, the printing original plate is composed of a support layer and an image forming layer, and the support layer is a sheet-like member having good resin absorbency, such as Manila hemp, sisal hemp, kenaf, It is formed by weaving or paper-making fibers such as pulp, polyester, vinylon, rayon, polypropylene, and glass fiber, and is also formed by a porous sheet material such as sponge. In addition to these, various materials can be used as long as they have good resin absorbency.

The image forming layer has an image pattern consisting of a plate-making portion and a plate-making portion, and is made of a material which resin does not penetrate. This image pattern includes infrared stencil, thermal element stencil,
It can be formed by a laser beam stencil or the like. Infrared stencil, a thermosensitive resin film is attached to the support layer, or a flexible laminate sheet is formed by coating a thermosensitive resin, and the thermosensitive resin is used as an image forming layer, The plate-making portion is formed by irradiating the image forming layer with infrared rays and punching. Further, in the heat-sensitive element stencil, the plate-making portion is formed by bringing the heat-sensitive element constituting the image forming layer of the laminate sheet formed as described above into contact therewith and punching. Further, the laser beam stencil uses a laser beam to perforate a plate making portion. These are stencil plates using thermal energy, and the heat-sensitive element stencil plate and the laser beam stencil plate can form an image by using, for example, a personal computer and perform the stencil plate based on the image. That is, stencil printing can be performed by punching a resin film of a laminated sheet with a print head of a thermal printer connected to a personal computer.

In the case of stencil making use of heat energy, a laminated sheet is formed by adhering a resin film to a support layer. Examples of the resin film include polyester film, polyester copolymer film and vinyl chloride film. , Polypropylene film, vinyl chloride-vinylidene copolymer film, etc., which are heat-sensitive perforation and which do not penetrate resin. The thickness thereof varies depending on the mesh of the screen gauze and the like, but is usually 0.5 μm to 7.0 μm.
The degree.

As the adhesive for bonding the support layer and the resin film in the above-mentioned laminated sheet, 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, polyvinyl alcohol resin, etc. can be used.

Here, the unprinted portion in the image forming layer is for curing the resin on the screen gauze to form a film, so that the image forming layer can be easily peeled from the screen gauze. It is preferable to form a release layer on the surface. As the release layer, for example, a surfactant, a silicone resin, a fluorine resin, or the like is suitable. When the heat sensitive element is used for perforation, the release layer exerts the stick preventing function of the heat sensitive element.

Next, the screen gauze may be any one that allows the ink to pass during printing, and for example, polyester, silk, cotton, nylon, rayon, stainless steel and the like commonly used in screen printing can be used.

A resin solution is used for forming a film on an unprinted portion of an image pattern on a screen cloth. Examples of the resin solution include an ultraviolet curable resin, a diazo type photosensitive emulsion, and a dichromic acid type photosensitive material. Resin solutions such as emulsions, acrylic monomer-based photosensitive emulsions, stibazole-based photosensitive emulsions are suitable. Other than this, for example, vinyl acetate, vinyl chloride-vinyl acetate copolymer resin, polyester resin, urethane resin, polyamide resin, chlorinated polypropylene resin,
It may have an adhesive function such as acrylic resin, styrene resin, styrene-maleic acid resin, polyvinyl alcohol resin, carboxymethyl cellulose resin, starch and epoxy resin. If necessary, additives such as colorants such as pigments and dyes, antistatic agents, lubricants and the like can be added. By adding a colorant, the image pattern can be clearly seen, and by adding an antistatic agent or a lubricant, the squeegee can be operated smoothly during printing and the influence of static electricity can be prevented. Here, the viscosity of the resin is 100 CPS to 50.
It is possible to use one in the range of 000 CPS, and preferably to use a liquid in the range of about 300 CPS to 20000 CPS.

As described above, the printing original plate composed of the laminate of the image forming layer and the support layer can be formed by stencil by infrared rays, heat sensitive elements or laser light as described above. Place them on top of each other and bring them into close contact. Then, the resin liquid is supplied from the side of the screen surface and is uniformly coated with a squeegee or the like. Since the supporting layer is exposed on the screen side of the printing plate for the printing plate precursor, the coated resin liquid permeates and is absorbed by the supporting layer and is released from the screen side. The resin liquid in the plate-making portion remains attached to the screen gauze. Therefore, when it is cured with this resin liquid and the printing plate precursor is peeled from the screen gauze, a resin film of the unmade plate portion is formed on the screen gauze surface, thereby forming a screen printing plate.

The film-forming type screen printing plate making apparatus and the method for producing a screen printing plate as described above form a resin film of an unmade plate portion on the screen gauze, but by the method of transferring the image forming layer to the screen gauze. Can also form a screen printing plate.

In this case, the printing original plate comprises a support layer and an image forming layer, and the materials of the support layer and the image forming layer and the method of forming an image pattern in the image forming layer are the same as those of the printing original plate described above. Is. The image forming layer forms a laminate sheet by adhering the resin film and the supporting layer, and in this case, the adhesive has a relatively weak adhesive force and is preferably capable of being peeled off relatively easily. A colorant such as a pigment or a dye, an antistatic agent, a lubricant and other additives may be added to the adhesive.

Adhesives to be coated on the screen gauze in close contact with each other and coated from the side of the screen gauze include vinyl acetate, vinyl chloride / vinyl acetate copolymer resin, polyester resin, urethane resin, polyamide resin, Chlorinated polypropylene resin, acrylic resin, styrene resin, styrene maleic acid resin, polyvinyl alcohol resin, carboxymethyl cellulose resin, starch,
Epoxy resin or the like is preferably used. Here, since the image forming layer constituting the printing original plate is transferred to the screen side by adhering it to the screen side,
It is preferable that stronger adhesive force acts between the image forming layer and the support layer.

Then, a printing original plate composed of a laminate of an image forming layer formed by stencil by infrared rays, a heat sensitive element or a laser beam and a supporting layer is superposed on the screen cloth in a close contact state. Then, an adhesive is supplied from the side of the screen surface and is uniformly coated with a squeegee or the like.
Since the supporting layer is exposed on the screen side of the printing plate for the printing plate precursor, the coated adhesive permeates and is absorbed by this supporting layer and is released from the screen side. The adhesive of the plate-making part remains attached to the screen gauze, and the unmade plate part of the image forming layer is adhered to this screen gauze. After that, the support layer in the printing original plate is peeled off from the image forming layer by using a solvent or the like to form a screen printing plate having the image forming layer transferred to the screen surface.

Whether the film forming method or the transfer method is adopted, the printing original plate has a support layer made of a sheet material having a good resin absorbability, and is made of a resin impermeable member or an adhesive impermeable member. Since the image forming layer is formed by laminating an image forming layer having a desired image pattern and the image forming layer is not directly formed on the screen gauze, the printing plate cannot be reused. If the film-formed and transferred member is peeled off with a solvent or the like, it can be reused. Therefore, since the screen gauze, which is an expensive member, can be repeatedly used, the screen printing plate can be manufactured at low cost.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. First, FIGS. 1 and 2 show the configuration of a screen printing plate making apparatus. Here, in the method of forming a film on the screen gauze surface using the printing original plate and the method of transferring the image forming layer of the printing original plate to the screen gauze, the image forming layer is peeled off together with the supporting layer, or only the supporting layer is formed. Although the image forming layer is peeled off and the image forming layer is left on the screen side, the other configurations are substantially the same. Therefore, the screen printing plate making apparatus for the film forming method will be described here, and the transfer method will be described. The description of the configuration of the screen printing plate making apparatus for use is omitted.

In the figure, 1 is a printing original plate,
In this printing original plate 1, an image forming layer 3 in which a predetermined image pattern is drawn by a stencil is adhered to a support layer 2 made of a sheet having excellent resin absorption performance. Further, a release layer 4 such as a surfactant is laminated on the surface of the image forming layer 3. The image forming layer 3 is composed of a plate-making portion 3a and a non-plate-making portion 3b, and the support layer 2 is exposed at the plate-making portion 3a. Reference numeral 5 denotes a screen gauze, and the screen gauze 5 is attached to the printing frame 6 with a predetermined tension. Then, as shown in FIG. 2, the printing original plate 1 is superposed so that its image forming layer 3 side is in close contact with the screen cloth 5, and the resin liquid 7 is applied from the screen cloth 5 side. The resin liquid 7 is stretched on the screen cloth 5 using a squeegee 8 so as to have a uniform film thickness. In the film-forming type screen printing plate making apparatus, the resin liquid 7 may have an adhesive function, but, for example, an ultraviolet curable resin or a photosensitive resin can be used, while a transfer liquid can be used. In the case of the screen printing plate making apparatus of the system, an adhesive is used.

The screen printing plate making apparatus is constructed as described above. Next, a method for producing a screen printing plate using this plate making apparatus will be explained.

First, a method of manufacturing a screen printing plate by a film forming method will be described. The image forming layer 3 which constitutes the printing original plate 1 draws a predetermined image pattern by a stencil by infrared rays, a heat sensitive element or laser light. A personal computer and its printer are used to form this image pattern. First, the personal computer creates desired image data. This image data may be created by using a data input device, or image data may be captured by using an image scanner. Further, the data read by the image scanner may be processed by a personal computer. , A pattern for plate making can be easily obtained. Therefore, the laminate sheet including the indicator layer 2 and the resin film forming the image forming layer 3 is mounted on a printer connected to a personal computer. Here, the printer is a thermal printer using a heat-sensitive element as a print head, and the heat-sensitive element is used to perforate the resin film forming the image forming layer 3 so that stencil printing can be performed very easily. Thus, in the image forming layer 3, the portion of the plate-making portion 3a on which the image pattern is drawn is perforated to expose the supporting layer 2, and the portion of the unplate-making portion 3b is not perforated, and the supporting layer 2 forms an image. It is in a state of being covered by the forming layer 3. Here, the heat-sensitive element for perforating the resin film can form a fine image by increasing the number of dots per unit area as much as possible, and can form a high-quality image forming layer 3 with a clear and sharp contour. Can be formed. This printing master 1
Are superposed so that the image forming layer 3 side is in close contact with the screen mesh 5 attached to the printing frame 6.

Next, the resin liquid 7 is applied to the screen cloth 5, and the squeegee 8 stretches the resin liquid 7 so as to be uniform throughout. Here, as shown in FIG. 3, the resin liquid 7 remains as it is in the unpressurized portion 3b of the printing original plate 1, but is exposed in the prepressed portion 3a.
Will be penetrated and absorbed by. And unprinted part 3
The resin liquid remaining in b is irradiated with ultraviolet rays or exposed to light,
Alternatively, a resin film having a pattern of the unprinted plate portion 3b is formed on the screen mesh 5 by curing the resin liquid by natural drying or the like.

After that, as shown in FIG. 4, the printing original plate 1 is peeled off from the screen cloth 5. Here, since the release layer 4 is laminated on the surface of the unprinted portion 3b of the printing original plate 1, the cured resin does not adhere to the printing original plate 1 and can be peeled off very easily. it can. As a result, the screen plate 5 has an unprinted portion 3b.
A screen printing plate having a resin film having a pattern of is formed.

On the other hand, in the case of the transfer method, an adhesive is applied to the screen cloth in a state where the printing cloth is brought into close contact with the screen cloth so that the unmade plate portion in the image forming layer of the printing cloth is screened. To adhere to. Here, in the case of the transfer method, the release plate is not provided on the printing original plate. Then, when the support layer is peeled off after the adhesive is cured, the image forming layer which is an unprinted portion is transferred to the screen gauze,
It becomes a screen printing version.

As described above, by using the printing original plate comprising the laminate sheet of the supporting layer and the image forming layer,
A desired image pattern on the image forming layer can be mounted on a thermal printer or a laser printer that outputs image data created by a personal computer, and can be formed by a method similar to normal printing. Then, using this printing original plate, a printing plate is formed by forming a resin film corresponding to the unprinted portion on the screen gauze or by transferring the image forming layer. Since excess resin and adhesive are absorbed and removed by the support layer of the original plate, film formation and transfer can be performed extremely easily, quickly and accurately. Moreover, since the film residue generated during stencil does not adhere to the screen gauze at all, there is no risk that the mesh will be clogged, the ink will fall well during printing, and the printing quality can be maintained high even after repeated printing. , And maintain a sufficient print density. In addition, although the printing original plate cannot be reused, the screen gauze itself can be repeatedly reused by dissolving the film-forming resin and the transfer adhesive with a solvent, etc. It is also possible to reduce.

Experimental Example A heat-shrinkable polyester film having a thickness of 1.5 μm was used as an image forming layer, and a Manila hemp paper having a thickness of 100 μm was used as a supporting layer, and an adhesive made of a vinyl chloride-vinyl acetate copolymer was used. Both were adhered so that the nonvolatile content was 0.5 g / m ² . Then, 0.05 g of a silicone-acryl graft copolymer resin is formed on the surface of the image forming layer.
A laminated sheet is formed by coating so that the coating amount becomes / m ² , and this laminated sheet is used for a thermal printer EL for a personal computer.
Plate making was performed using 5500 (manufactured by Silver Seiko). Then, a 23-denier, 150-mesh screen gauze made of polyester was attached to a printing frame with a gauze pasting machine and the printing plate was assembled so that the image forming layer side of the printing plate was brought into contact, and the space between the two was placed. I made them stick. Then, a urethane emulsion (ICI
Company name NeoTac R-9619) was coated with a squeegee from the side of the gauze (the side that supplies the printing ink during printing) and dried with warm air at 40 ° C. to cure the resin liquid. During this period, the excess resin is removed from the screen gauze by permeating and absorbing the support layer. After that, by peeling the printing plate,
A screen printing plate having a resin film on an unprepared portion was formed.

Comparative Example A heat-shrinkable polyester film having a thickness of 2.0 μm and a polyester 23 denier, 150 mesh screen printing gauze with a vinyl chloride-vinyl acetate copolymer adhesive as a non-volatile component were used. Adhesion was performed using 0.5 g / m ² . Then, a silicone-acrylic graft copolymer resin was applied to the film surface side so as to have an adhesion amount of 0.05 g / m ² , to obtain a heat-sensitive screen sheet. This heat-sensitive screen sheet was prepared by the same thermal printer as in the experimental example, and then adhered to a printing frame to obtain a screen printing plate.

Each of the above screen printing plates was attached to a simple screen base, and a water-based screen printing ink was used to press a vinyl chloride sheet with a squeegee while applying pressure, and the printing plate was repeatedly washed. It was As a result, in the screen printing plate of the experimental example, the printing density and the definition were not changed even when the printing was repeated 5,000 times or more, and the washing resistance of the screen printing plate had no problem. On the other hand, in the screen printing plate of Comparative Example 1,
When repeated printing of about 500 sheets was performed, the print quality was slightly lowered, and the washing resistance was lowered to such an extent that it becomes a practical problem.

[0034]

Since the present invention is constructed as described above, it is extremely simple as compared with the plate making process according to the prior art and enables clear plate making and printing at low cost and has good durability. In addition, large-scale printing is possible, and the screen gauze has effects such as being reusable by washing off the resin and adhesive.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view of a screen printing plate making apparatus showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a screen printing plate making apparatus.

FIG. 3 is an explanatory diagram showing a film forming process of a screen printing plate.

FIG. 4 is an explanatory diagram showing a peeling process of a screen printing plate.

[Explanation of symbols]

 1 Printing original plate 2 Support layer 3 Image forming layer 4 Release layer 5 Screen cloth 6 Printing frame 7 Resin liquid 8 Squeegee

Claims (6)

[Claims] 1. A printing original plate in which an image forming layer formed of a resin impermeable member and having a desired image pattern is laminated on a support layer made of a sheet material having good resin absorbability, and this printing original plate. Of the screen gauze to be superposed on the image forming layer side, coated on the screen gauze side superposed on the printing original plate, and having good absorbability to the support layer,
A screen printing plate making apparatus comprising a film forming member made of a resin liquid curable on a screen surface. 2. A printing original plate comprising a support layer made of a sheet material having good adhesive absorbability and an image forming layer formed of an adhesive impermeable member and having a desired image pattern formed thereon,
A screen gauze that is superposed on the image forming layer side of the printing original plate, and an adhesive that coats the screen gauze side that is superposed on the printing original plate to adhere the image forming layer to the screen gauze. A screen printing plate making apparatus characterized by. 3. The image forming layer of the printing original plate,
3. The screen printing plate making apparatus according to claim 1, wherein the screen printing plate making apparatus is one of an infrared ray, a heat sensitive element, and a stencil by laser light. 4. The screen printing plate making apparatus according to claim 1, wherein a release film is formed on the surface of the image forming layer of the printing original plate. 5. A printing method for forming a printing original plate comprising a laminate of a support layer made of a sheet material having good resin absorbency and a resin impermeable member and an image forming layer having a desired image pattern formed thereon. Plate forming step, a screen gauze bonding step of superimposing a screen gauze on the image forming layer side of this printing plate in a close contact state, and a resin solution is uniformly coated from the screen gauze side to form a plate making portion of the image forming layer. Production of a screen printing plate comprising a film forming step of absorbing a resin liquid into a support layer to form a resin film body in an unmade portion on a screen gauze, and a peeling step of peeling the printing original plate from the screen gauze Method. 6. A printing original plate is formed by laminating a support layer made of a sheet material having good adhesive absorbency and an image forming layer made of an adhesive impermeable member and having a desired image pattern formed thereon. A printing plate forming step, and a screen gauze bonding step in which a screen gauze is superposed on the image forming layer side of the printing plate precursor in a close contact state, and an adhesive is uniformly coated from the screen gauze side to screen the image forming layer. A method for producing a screen printing plate, comprising a bonding step of bonding to a gauze and a peeling step of peeling the support layer.