JP2829004B2 - Silk screen film sheet - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a film sheet used for a cutting method in a silk screen plate making method.

[Prior art] Silk screen plate making methods include direct method, indirect method,
There are direct method and cutting method.

Conventionally, the cutting method in silk screen printing is to paste what is called varnish base paper on the original drawing, cut the outline with a cutter, remove the characters and image lines of the part you want to print on the silk screen mesh, and from the back The plates were stuck together by heating with an iron.
However, this method requires a long operation for close contact.

The silk screen mesh is usually made of silk, tetron, nylon or the like. In this method, when the varnish base paper is bonded to the screen mesh, the temperature of the iron is as high as 120 ° C to 150 ° C, so meshes such as nylon and tetron are used to cause deformation at this temperature. No, it is necessary to use silk for the mesh in principle. In addition, since the adhesive strength between the mesh and the varnish is weak and the ability to follow the mesh is poor, the printing durability is weak and reinforcement or the like is required for printing many sheets.

As a technology other than varnish base paper, a method using a thermoplastic resin instead of shellac varnish impregnated in varnish base paper (Japanese Patent Publication No. 54-38679), a method using a heat-fusible adhesive having a softening point of 70 ° C to 150 ° C (JP-A-58-112797) has been proposed. A method using a film sheet instead of varnish base paper (JP-A-59-91094 and JP-A-55-164161) has been proposed.

The film sheet is a plate (a seal on the screen)
The film that constitutes is attached to the mount via an adhesive or the like, cuts the necessary pattern shape into the film and the layer of the adhesive, peels the film inside or outside the pattern from the mount, and removes the remaining film sheet JP-A-55-164161 discloses a film sheet in which an adhesive layer is sandwiched between a water-soluble film and a backing paper.

[Problems to be Solved by the Invention] However, even in the method using a thermoplastic resin or the method using a heat-fusible adhesive having a specific softening point, the work of bonding still requires a long time, It is necessary to use a mesh with a characteristic.

On the other hand, in the method using a film sheet, although the bonding operation does not require much time, the adhesive force with the mesh is weak because the adhesive or the water-soluble film is dissolved in water for bonding to the silk screen mesh and bonded. However, there is a disadvantage that the sharpness of the edge is inferior, the printing durability is weak, and it is difficult to print many sheets.

Also, since it is manufactured by forming a water-soluble resin film in advance and bonding this film to the mount,
There is a disadvantage that it takes time to manufacture the film sheet.

The object of the present invention is to solve the above-mentioned conventional disadvantages, shorten the long-time work for adhesion during the bonding operation, further reduce the bonding temperature, can be used with meshes other than silk, and An object of the present invention is to provide a silk-screen plate making film sheet having good printing durability and a method for producing a silk-screen printing plate using the same.

[Means for Solving the Problems] A film sheet of the present invention that achieves the above object is obtained by forming a peelable film made of a resin having a low melting point on a support, or by forming a polymer on the support. A layer and a film made of a resin having a low melting point are sequentially laminated, and polycaprolactone and / or a polycaprolactone derivative are used as the resin having a low melting point. The polymer layer has a higher melting point than the coating. Preferably, the molecular weight of polycaprolactone and its derivatives is between 8000 and 100,000. The method of manufacturing a silk screen printing plate using such a film sheet, the film sheet after cutting a predetermined pattern on the film sheet, and removing the film on the support corresponding to the pattern is the film. A silk screen plate making is performed by laminating and heat-bonding so as to face the screen mesh and then peeling off the support.

First, the film sheet for silk screen of the present invention will be described. The silk screen film sheet 4 of the present invention has a structure in which a specific film 2 (or a high-melting polymer layer 2 ′ and a film 2) is laminated on a support 1 as shown in FIG. 1 or FIG. Have.

As the support 1, for example, a plastic film such as a polyester film, a polyethylene film, a polycarbonate film, and a polypropylene film, a synthetic paper, a resin-impregnated paper, a polyethylene laminated paper, and the like can be used. It is preferable to use a plastic film in consideration of the properties, adhesion to printed matter such as paper, and dimensional stability.

In cutting, an appropriate adhesion between the film 2 or the polymer layer 2 'and the support 1 is required. Depending on the support used for this purpose, it is preferable to apply an appropriate release treatment or undercoating treatment to the support. In particular, when a natural or synthetic rubber system having low tackiness is used to perform the undercoating treatment, the coating 2 does not fall off after cutting the coating 2,
If the film is accidentally peeled off, it can be re-adhered.

The film 2 has a certain film property in order to have releasability from the support 1 and to have printing durability as a printing plate, and has a melting point in order to thermally adhere to a gauze such as Tetron or nylon. Is low, for example, a resin of about 50 ° C. to 70 ° C., and polycaprolactone or a polycaprolactone derivative is used as such a resin. Polycaprolactone is a polyester resin and is a ring-opened polymer of ε-caprolactone. Its characteristic is that it has a low melting point and equilibrium at 60 ° C to 70 ° C despite its high degree of polymerization compared to conventional polyethylene terephthalate-based polyesters. In addition, it has low blocking properties despite its low melting point. As polycaprolactone that satisfies such conditions, in the case of polycaprolactone alone, it is particularly preferable to use those having an average molecular weight of 8,000 to 100,000. Further, as the derivative thereof, a copolymer of polycaprolactone with an aliphatic dicarboxylic acid and an aliphatic diol (JP-A-58-81042), a polycaprolactone-poly (dimethylsiloxane) block copolymer, and the like can also be used.

Polycaprolactone and polycaprolactone derivatives can be used alone or as a mixture.

Further, in order to improve the printing durability of the film 2, a plasticizer and other additives can be appropriately added as long as the properties of these compounds are not impaired.

The polymer layer 2 'gives the plate a predetermined thickness when making the plate,
And it is provided in order to improve the physical properties such as printing durability.

If the coating 2 itself has sufficient thickness and printing durability, it may be omitted.

Here, a high-melting polymer refers to any natural or synthetic polymer that has a melting point higher than the melting point of the resin constituting the film, has good adhesion between layers, has film properties, and is not water-soluble. But can be used.

Specifically, polyvinyl resins, copolymers of (meth) acrylates and (meth) acrylic acid, copolymers of styrene and butadiene with (meth) acrylates, saturated or unsaturated polyesters , Synthetic resins such as polyurethane, styrene-butadiene copolymer,
Synthetic rubber resins such as acrylonitrile-butadiene copolymer, polyisoprene, polybutadiene, and polychloroprene are exemplified.

The laminate composed of the coating 2 and the polymer layer 2 'is a plate on a screen mesh. For example, when the plates are thermally bonded, polycaprolactone acts as an adhesive with the mesh, and the laminate thickness of the high-melting polymer is reduced. Always a constant thickness.
Therefore, there is an advantage that the thickness of the printing ink can be freely changed by changing the film thickness.

The coating 2 such as polycaprolactone and / or the high-melting polymer layer 2 ′ may contain a coloring agent. By coloring these laminates, it is convenient to confirm the pattern after cutting and peeling.

The film sheet for a silk screen of the present invention is formed by coating a support 1 with a low-melting resin such as polycaprolactone with a suitable solvent and drying to form a predetermined film 2 or forming a polymer layer 2 ′ on the support 1. After providing the polymer layer 2 'by applying and drying with a suitable solvent or laminating a high melting point polymer film, the film 2 made of a low melting point resin such as polycaprolactone is formed as described above (No. 1).

Next, a method of manufacturing a silk-screen printing plate using the silk-screen film sheet 4 configured as described above will be described. As shown in FIG. 2, desired cuts such as characters and figures are cut on the film sheet 4 by a cutter or a plotter. Next, the laminate (coating 2 and polymer layer 2 ') of the portion of the pattern to be printed is peeled off and removed from the support 1 (FIG. 3), so that the coating surface is attached to the screen mesh 5 and is thermally bonded (see FIG. 3). 4
FIG. 5). Here, the film 2 is made of a resin having a low melting point, for example, polycaprolactone or a derivative thereof.
The film 2 can be adhered to the screen mesh 5 at a low temperature of 60 ° C. to 70 ° C. in a short time, and the adhesion to the mesh 5 is strong. After thermal bonding, the silk screen printing plate 6 can be obtained by peeling the support 1.
Figure).

 Hereinafter, the present invention will be described in more detail with reference to examples.

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

Film formulation Polycaprolactone (Aldrich Chemical Company In
c.) 20 parts by weight Toluene 80% by weight Undercoat prescription 5 parts by weight of isoprene rubber 95 parts by weight of toluene Dissolve each component with a stirrer, apply an undercoat layer on a 75 μm polyester film, and dry to a thickness of 1 μm. Further, a film layer was laminated thereon, dried and dried to a film thickness of 35 μm to obtain a film sheet for silk screen printing by a cutting method. The film portion of this film sheet was cut by a plotter, and the portion to be printed was peeled off. This is further placed on a screen frame with polyester mesh # 270
The printing plate was attached by using an iron heated to 5 ° C., and after cooling, the polyester film was peeled off. Then, printing was performed using a water-based ink (Aqua Asset Ink (manufactured by Jujo Kako)), and the printing of several hundred sheets was satisfactory without any plate collapse.

Example 2 The coating and the undercoat layer had the same formulation as in Example 1, and were prepared by stirring and dissolving a coating solution for a high-melting polymer layer having the following formulation.

High melting point polymer layer formulation Vinylite VYHH (Union Carbide, vinyl chloride-vinyl acetate resin) 20 parts by weight Methyl ethyl ketone 80 parts by weight Subbing layer 1μ, high melting point polymer layer 20μ, coating layer 20μ on 75μ polyester film in order Lamination coating was performed to obtain a film sheet. Using this film sheet, a printing plate was prepared and printed in the same manner as in Example 1. The results were good, as in Example 1, with no plate collapse observed. Further, since the melting point of the high-melting polymer layer was high, the cut edge was sharp, and a film thickness of 20 μ was uniformly formed on the screen mesh regardless of the sticking time, and no printing unevenness was observed.

[Effects of the Invention] As is clear from the above examples, the film sheet for a silk screen of the present invention has a coating made of a specific low-melting substance formed on a support, so that the bonding operation can be performed in a short time. It can be performed easily and easily, can keep the bonding temperature low, and can be used for meshes other than silk, such as nylon and tetron.

In addition, since the adhesiveness with the mesh after bonding is good, a silk screen plate having excellent printing durability can be obtained.

Further, by providing the high melting point polymer layer on the support, the uniformity of the thickness of the plate is improved, so that good printing without printing unevenness can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing one embodiment of a film sheet for silk screen of the present invention, and FIGS. 2 to 6 are silk screen printing plates using the film sheet of FIG. It is a figure which shows the manufacturing method of. DESCRIPTION OF SYMBOLS 1 ... Support 2 ... Film 2 '... High melting point polymer layer 4 ... Film sheet 5 ... Screen mesh 6 ... Printing plate

Claims (4)

(57) [Claims] 1. A film sheet for a silk screen, comprising a support having thereon a releasable film formed of a resin having a low melting point, wherein the resin is polycaprolactone and / or a polycaprolactone derivative. 2. A polymer layer and a film comprising a low melting point resin are sequentially laminated on a support, wherein said low melting point resin is polycaprolactone and / or a polycaprolactone derivative, and said polymer layer is A film sheet for silk screen characterized by having a higher melting point than the film. 3. The film sheet for a silk screen according to claim 1, wherein the polycaprolactone and the polycaprolactone derivative have a molecular weight in the range of 8,000 to 100,000. 4. The film sheet for a silk screen according to claim 1, wherein the film and / or the polymer layer contains a coloring agent.