JPH0299393A - Film sheet for silk screen and manufacture of silk screen plate form using same - Google Patents

Abstract

PURPOSE:To shorten working time for lamination, to lower laminating temperature, and besides to improve plate wear by a method wherein a film composed of polycaprolactone and/or polycaprolactone derivative is formed on a base material. CONSTITUTION:A silk screen film sheet 4 is constructed by forming a film 2 composed of polycaprolactone and/or polycaprolactone derivative on a base material 1, or by laminating a macromolecular layer 2' of which melting point is higher than that of the film 2 on the base material 1 and further laminating the film 2 composed of polycaprolactone and/or polycaprolactone derivative thereon. In order to manufacture of silk screen form plate 6 using the film sheet 4 like this, a specific pattern is cut on the film sheet 4, and the film sheet after removing the film 2 on the base material 1 corresponding to said pattern is so laminated that the film faces a screen mesh 5 to be bonded by heating. Then, the silk screen plate form is manufactured by peeling the base material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film sheet used in a cutting method in a silk screen plate making method.

[Prior Art] Silk screen plate making methods include a direct method, an indirect method, a direct method, and a cutting method.

Traditionally, the cutting method for silk screen printing involves pasting something called varnish base paper onto the original image, cutting the outline with a cutter, removing the characters and drawing lines from the part you want to print, and applying it to a silk screen mesh. They were pasted together to form a plate by heating them with an iron or the like. However, this method requires long hours of work to achieve close contact.

In addition, silk screen mesh is usually made of silk, Tetoron,
Materials such as nylon are used. In this method,
When pasting the varnish base paper onto the screen mesh, the temperature of the iron reaches a high temperature of 120℃ to 150℃, so meshes made of nylon, Tetron, etc. cannot be used at this temperature because they will deform, and as a general rule, meshes cannot be used. It is necessary to use silk as a material. Furthermore, since the adhesive force between the mesh and the varnish is weak and the followability with the mesh is poor, the printing durability is low and reinforcement is required for printing a large number of sheets.

Techniques other than varnished paper include the use of thermoplastic resin instead of shellac varnish impregnated into varnished paper (Japanese Patent Publication No. 54-38679), and the use of a heat-fusion adhesive with a softening point of 70°C to 150'C. Method (Japanese Unexamined Patent Publication No. 58-11279
No. 7) has been proposed. In addition, a method using a film sheet as a support instead of varnish paper (Japanese Patent Application Laid-Open No. 59-9
No. 1094 and JP-A-55-164161) have been proposed.

[Problems to be Solved by the Invention] However, even with methods using thermoplastic resins or heat-sealing adhesives with a specific softening point, the bonding process still takes a long time, and the heat-resistant It is necessary to use a suitable mesh.

On the other hand, with the method of using film sheets, it does not take much time to bond them together, but because the adhesive or water-soluble film is dissolved in water and bonded to the silk screen mesh, the adhesive strength with the mesh is poor. It has the drawbacks of being weak, having poor edge sharpness, and poor printing durability, making it difficult to print a large number of sheets.

The purpose of the present invention is to solve the above-mentioned conventional difficulties, shorten the long work required for adhesion during lamination, keep the lamination temperature low, and be able to use meshes other than silk. The present invention provides a film sheet for silk screen plate making that has good printing durability and a method for manufacturing a silk screen printing plate using the same.

[Means for Solving the Problems] The film sheet of the present invention that achieves these objects has the following features:
A film made of polycaprolactone and/or a polycalolactone derivative is formed on a support, or a polymer layer having a higher melting point than the film is laminated on the support, and then polycaprolactone and/or a polycarolactone derivative is formed on the support. The method for producing a silk screen printing plate of the present invention using such a film sheet involves cutting a predetermined pattern on the film sheet, and cutting the film sheet corresponding to the pattern. After removing the film on the support, the film sheets are stacked and thermally bonded so that the film faces the screen mesh, and then the support is peeled off to perform silk screen printing.

First, the silk screen film sheet 4 of the present invention will be explained. As shown in FIG. Molecular layer 2' and film 2
) has a laminated structure.

As the support 1, for example, plastic films such as polyester film, polyethylene film, polycarbonate film, polypropylene film, etc., as well as synthetic paper, resin-impregnated paper, polyethylene laminated paper, etc. can be used, but the sharpness of the edge after cutting the printing material may be used. It is preferable to use a plastic film in consideration of adhesion to printed matter such as paper or dimensional stability.

Further, upon cutting, proper adhesion between the film 2 or polymer layer 2' and the support 1 is required. Depending on the support used for this purpose, it is preferable to subject the support to a suitable release treatment or subbing treatment. In particular, when a natural or synthetic rubber system having low adhesiveness is used for the undercoat treatment, the coating 2 will not fall off after cutting, and even if the coating is accidentally peeled off, it can be reattached.

The film 2 is made of polycaprolactone or a polycaprolactone derivative. Polycaprolactone is a polyester resin and is a ring-opening polymer of E-caprolactone. Its feature is that it has a low melting point of 60°C to 70°C despite its high degree of polymerization compared to conventional polyethylene terephthalate polyester.
Equilibrium occurs at °C. In addition, it has little blocking property despite its low melting point. As printing plates, printing durability is required, so a certain level of film physical properties are required, and Tetron,
The melting point is 50℃~7 for thermal adhesion to gauze such as nylon.
It is desirable that the temperature be around 0°C. In order to satisfy this condition, it is preferable to use polycaprolactone having an average molecular weight of 8,000 to 100,000 when used alone. Further, as derivatives thereof, copolymers of polycaprolactone, aliphatic dicarbonane and aliphatic diol (JP-A-58-81042) and polycaprolactone-poly(dimethylsiloxane) block copolymers can also be used.

Polycaprolactone and polycaprolactone derivatives can be used alone or in combination.

Furthermore, in order to improve the printing durability of the film 2, plasticizers and other additives can be added as appropriate within a range that does not impair the properties of these compounds.

The polymer layer 2' is provided to give the plate a predetermined thickness during plate making and to improve its physical properties such as printing durability.

This may be omitted if the coating 2 itself has sufficient thickness and printing durability.

Here, high melting point polymers have a melting point higher than the melting point of the polycaprolactone that is laminated, have good adhesion between layers, have film properties, and can be any natural or synthetic polymer as long as it is not water soluble. can be used.

Specifically, polyvinyl resins, copolymers of (meth)acrylic esters and (meth)acrylic acid, copolymers of styrene and butadiene with (meth)acrylic esters, and saturated or unsaturated polyesters. , synthetic resins such as polyurethane, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, polyisoprene,
Examples include synthetic rubber resins such as polybutadiene and polychloroprene.

The laminate consisting of the film 2 and the polymer layer 2' serves as a plate on the screen mesh, and when the plate is thermally bonded, for example, polycaptolactone acts as an adhesive to the mesh.
The laminated thickness of the high melting point polymer is always constant. Therefore, there is an advantage that the thickness of printing ink can be freely changed by changing this film thickness.

Incidentally, a coloring agent can be contained in the film 2 and/or the high melting point polymer layer 2' made of polycaprolactone or the like. By coloring these laminates, it is convenient to check the pattern after cutting and peeling.

The film sheet for silk screen of the present invention is a support 1
Polycaprolactone or the like is coated on the support 1 with a suitable solvent and dried to form a predetermined film 2, or a polymer layer 2' is coated on the support 1 with a suitable solvent and dried, or a high melting point polymer film is formed. After the polymer layer 2' is provided by lamination, a film 2 made of polycaprolactone or the like is formed as described above (FIG. 1).

Next, a method for manufacturing a silk screen printing plate using the silk screen film sheet 4 configured as described above will be explained. As shown in FIG. 2, cut patterns such as desired characters and figures are cut into the film sheet 4 using a cutter or plotter. Next, the laminate (film 2 and polymer layer 2') in the area of the pattern to be printed is peeled off from the support 1 (Fig. 3), and the film surface is attached to the screen mesh 5, and then thermally bonded ( Figures 4 and 5). Since the coating 2 is made of polycaprolactone or its derivatives having a low melting point, the coating 2 can be bonded to the screen mesh 5 in a short time at a low temperature of approximately 60° C. to 70'C, and moreover, the coating 2 can be bonded to the screen mesh 5 in close contact with the mesh 5. Strong sexuality.

After thermal adhesion, a silk screen printing plate 6 can be obtained by peeling off the support 1 (FIG. 6).

A more detailed explanation will be given below with reference to examples.

Example 1 A composition for forming a film used as a printing plate was prepared at the following blending ratio.

Film formulation polycaprolactone (Aldrich Chemica
Company Inc.) 20 parts by weight Toluene 80 parts by weight Isoprene rubber 5 parts by weight Toluene
95 parts by weight of each component were dissolved using a stirrer, and a subbing layer was applied to a 75 μm polyester film and dried to a film thickness of 1 μm. Further, a film layer was applied thereon in a laminated manner and dried to a film thickness of 35 μm to obtain a film sheet for silk screen printing using the cutting method. The film portion of this film sheet was cut using a plotter, and the portion to be printed was peeled off. Further, this was applied to a screen frame covered with polyester mesh #270 using an iron heated to 65°C, and after cooling, the polyester film was peeled off to obtain a printing plate. Then, printing was carried out using a water-based ink (Aquaset Ink (manufactured by Jujo Kako)), and after printing several hundred sheets, the printing plate was in good condition with no deterioration at all.

Example 2 The film and undercoat layer had the same formulation as in Example 1, and the coating liquid for the high melting point polymer layer with the following formulation was stirred and dissolved.
A was set up.

High melting point polymer layer formulation Veracalite VYHH (manufactured by Union Carbide, vinyl chloride-vinyl acetate resin) 20 parts by weight methyl ethyl ketone
80 parts by weight of a 75μ polyester film was coated with a subbing layer of 1μ, a high melting point polymer layer of 20μ, and a film of 520μ in this order to obtain a film sheet. A printing plate was prepared using this film sheet in the same manner as in Example 1, and printing was performed. The results were good, as in Example 1, with no plate collapse observed at all. Furthermore, since the melting point of the high melting point polymer layer is high,
The cut edges were sharp, and a film thickness of 20 μm was uniformly formed on the screen mesh regardless of the adhesion time, and no printing unevenness was observed.

[Effects of the Invention] As is clear from the above examples, the silk screen film sheet of the present invention has a film made of a specific low-melting point substance formed on the support, so the bonding process can be completed in a short time. It can be easily carried out, the bonding temperature can be kept low, and it can also be used for meshes other than silk, such as nylon and Tetron.

Further, after lamination, the sealability with the mesh is good, so a silk screen plate with excellent printing durability can be obtained.

Furthermore, by providing a high melting point polymer layer on the support,
Since the uniformity of the plate thickness is improved, it is possible to perform good printing without printing unevenness.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the film sheet for silk screen of the present invention, and FIGS. 2 to 6 are diagrams showing a method for manufacturing a silk screen printing plate using the film sheet of FIG. 1. . 5...Screen Metsujuro...Print version

Claims (1)

[Scope of Claims] 1. A film sheet for silk screening comprising a support and a film made of polycaprolactone and/or a polycaprolactone derivative. 2. Polymer layer, polycaprolactone and/or on the support
Or a film sheet for a silk screen, characterized in that films made of polycaprolactone derivatives are successively laminated, and the polymer layer has a higher melting point than the film. 3. A predetermined pattern is cut on the film sheet for silk screen according to claim 1 or claim 2, and the film sheet after removing the film or polymer layer and film on the support corresponding to the pattern is A method for producing a silk screen printing plate, which comprises stacking and thermally adhering the film so as to face the screen mesh, and then peeling off the support.