JP2011194830A - The reinforcement method of screen printing plate, and screen printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement method of a screen printing plate which excels in plate durability and enables to print excellent images.SOLUTION: The reinforcement method of a screen printing plate includes; a mask treatment process which fills up and masks a mask member 2 having thixotropy at an opening 11 a thermoplastic resin film 10b and a part of a porous support 10a corresponding to the opening 11 from the thermoplastic resin film 10b side; a reinforcement member coating process which impregnates the reinforcement member 3 onto the porous support 10a which applies coating of the reinforcement member 3 from the porous support 10a side of the thermal stencil original paper 10 and which corresponds to the non-opening of the thermal stencil original paper 10; a reinforcement curing process which cures the reinforcement member 3 impregnated to the porous support 10a which corresponds to the non-opening of the thermal stencil original paper 10; and a mask member removal process which removes the mask member 2 which is filled up in the mask treatment process.

Description

  The present invention relates to a thermal screen printing plate reinforcing method and a screen printing plate that not only have excellent printing durability but also provide a good image.

  Conventionally, screen printing plates used in screen printing have a non-image portion formed by applying a photosensitive emulsion on a framed ridge and drying it, and then exposing it with a mask provided with an image pattern. While being cured, the uncured photosensitive emulsion in the image area was washed to remove the plate. However, this plate-making method has the disadvantages that it requires equipment such as a dedicated exposure apparatus and a dark room, and that it also requires processing of the waste liquid generated when washing and removing the uncured photosensitive emulsion.

  On the other hand, conventionally, an opening corresponding to an image is obtained by selectively heating and melting a thermoplastic resin film of a heat-sensitive stencil sheet obtained by laminating a thermoplastic resin film on a porous support with a heating device such as a thermal head. The thermosensitive plate making is also used as a method for easily obtaining a screen printing plate. This thermal plate making does not require equipment such as a dark room, can be made in a normal environment, and does not require a washing process or waste liquid treatment, and has an advantage that the environmental load is small.

  However, in order to obtain good perforation by heat-sensitive stencil, the thickness of the thermoplastic resin film of the heat-sensitive stencil sheet must be reduced. If this thickness is too thin, the film will be easily broken by impact or friction. There is a drawback that the printing durability of the printing plate is lowered. In particular, for display applications such as posters and signboards, it is necessary to print on a variety of substrates such as resin plates, metal plates, ceramic plates, and concrete in addition to paper, but screen printing plates obtained by thermal plate making are hard and uneven. When printing on a large number of base materials, burrs, crepes, sand grains, etc. rub against the plate, and the film of the non-opening portion is torn, pinholes are generated, and the durability of the plate is significantly reduced. Further, if there is a burr, a pinhole may be generated in the plate by only one printing, and the strength of the plate itself is low, so that the plate is stretched by printing and the image is deformed. Therefore, in order to solve such a problem, a thermal screen plate disclosed in Patent Document 1 below is provided.

  In the thermal screen plate disclosed in the following Patent Document 1, a resin solution is applied to the entire surface of the screen printing ridge in the thermal screen sheet in which the screen printing ridge and the hot melt pierceable film are bonded together. The resin solution in the region corresponding to the perforated region is removed and then dried. By making the plate in this way, the unprinted portion is reinforced with resin, and the printing durability, dimensional stability, alignment workability, etc. of the screen printing plate are improved.

Japanese Patent No. 3471186

  As described above, in the screen printing plate disclosed in Patent Document 1, the reinforcing material in the portion corresponding to the opening is removed by impregnating the resin solution as a reinforcing material on the side of the screen printing ridge which is a support after the film is perforated. Thereafter, the reinforcing material remaining in the non-opening is dried to reinforce the film.

  However, since it is difficult to completely remove unnecessary reinforcing material from the opening and the support layer, the coating film pressure due to a change in ink passage resistance of the support layer is blocked by the opening being blocked by the reinforcing material. Deterioration of the image such as reduction and color unevenness has been a problem. In particular, when the opening is formed of a fine character portion or a fine wire portion, the occlusion may cause a lack of fine characters or a skip of the fine wire. Further, further improvement in printing durability has been demanded.

  Therefore, the present invention has been made in view of the above problems, and provides a method for reinforcing a screen printing plate and a screen printing plate that provide not only excellent printing durability but also good images using a heat-sensitive stencil sheet. It is intended to do.

In order to achieve the above object, the method for reinforcing a screen printing plate according to claim 1 is a method of selectively heating the thermoplastic resin film in a heat-sensitive stencil sheet in which a thermoplastic resin film is laminated on a porous support. A method for reinforcing a screen printing plate formed by forming an opening corresponding to an image,
From the thermoplastic resin film side, a mask processing step of filling and masking a mask member having thixotropy in a portion corresponding to the opening of the opening and the porous support of the thermoplastic resin film; and
A reinforcing member applying step of applying a reinforcing member from the porous support side of the heat-sensitive stencil sheet and impregnating the reinforcing member into the porous support corresponding to a non-opening portion of the thermoplastic resin film;
A reinforcing member curing step for curing the reinforcing member impregnated in the porous support corresponding to the non-opening;
A mask member removing step of removing the mask member filled in the mask processing step;
It is characterized by including.

The method of reinforcing according to claim 2 screen printing plate in that in the reinforcing method of a screen printing plate of claim 1 wherein the relationship between the hardness H _R of the mask member and the hardness H _M of the reinforcing member, the reinforcing member cured step H _M <H _R becomes, H _M is after the reinforcing member curing step> in front, characterized in that the H _R.

  The method of reinforcing a screen printing plate according to claim 3 is the method of reinforcing a screen printing plate according to claim 1 or 2, wherein the surface of the mask member opposite to the thermoplastic resin film side in the reinforcing member application step. However, the reinforcing member is applied so as to maintain a state in which the reinforcing member protrudes beyond the surface of the reinforcing member opposite to the thermoplastic resin film side.

The method for reinforcing a screen printing plate according to claim 4 is the method for reinforcing a screen printing plate according to any one of claims 1 to 3, wherein an ink having thixotropy is used as the mask member in the mask processing step.
As the mask member removing step, a squeegeeing operation using a squeegee is performed on the ink filled in the mask processing step.

  A screen printing plate according to claim 5 is made by the reinforcing method according to any one of claims 1 to 4, and an inner peripheral wall perpendicular to the surface of the thermoplastic resin film on a reinforcing member layer in which the reinforcing member is cured. A through hole having a shape corresponding to the opening is formed.

  According to the method for reinforcing a screen printing plate of the present invention, the screen printing plate using the reinforcing member in a state where the opening formed in the thermoplastic resin film in the heat-sensitive stencil sheet and the porous support corresponding to the opening are protected by the mask member. This eliminates problems such as a decrease in coating film pressure due to a change in ink passage resistance of the support caused by the opening being blocked by a reinforcing material, and image deterioration such as color unevenness. be able to. In particular, even when the opening is formed of a fine character portion or a fine line portion, no fine character chipping or fine line skipping occurs, so that higher-accuracy screen printing can be realized.

  Further, since the screen printing plate obtained by the reinforcing method of the present invention is sufficiently reinforced, the plate can be reused unlike the conventional thermal screen printing plate, and the same plate can be used for a long time. High-quality printing.

  Further, the hardness of the mask member and the reinforcing member is such that the hardness of the mask member is higher than that of the reinforcing member during the reinforcing member application step, and the hardness of the reinforcing member is higher than that of the mask member after the reinforcing member curing step. Therefore, the mask processing of the opening can be reliably performed without damaging the mask member when applying the reinforcing member.

  Further, by applying the reinforcing member so that the surface of the mask member opposite to the thermoplastic resin film side is protruded from the surface of the reinforcing member opposite to the thermoplastic resin film side, the opening is applied. Thus, the mask member can be reliably removed without the mask member remaining.

  Further, by using a thixotropic ink as a mask member in the mask processing step, and performing a squeegeeing operation using a squeegee on the ink filled in the mask processing step as a mask member removing step, a mask removing step Since the printing process can be the same process, the ink used as the mask member is not wasted, and the printing process can be performed from the first printing process.

It is explanatory drawing which shows the reinforcement process in the reinforcement method of the screen printing plate which concerns on this invention. It is explanatory drawing which shows the other method in the reinforcement method. (A) It is a conceptual diagram after the reinforcement member application | coating in the method. (B) It is a conceptual diagram after the mask member removal in the method.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited by this embodiment, and all other forms, examples, operation techniques, etc. that can be implemented by those skilled in the art based on this form are included in the scope of the present invention. .

  First, a method for reinforcing a screen printing plate according to the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, the reinforcing method of the screen printing plate 1 of this example includes (1) a thermal plate making process, (2) a mask processing process, (3) a reinforcing member application process, (4) a reinforcing member curing process, 5) Reinforcing treatment is performed through the steps in the order of the mask member removing step. It should be noted that other processes may be added before and after or in the middle of these processes as long as the process contents do not hinder the process of each process.

(1. Thermal plate making process)
In the heat-sensitive plate making process of the present invention, a heat-sensitive stencil sheet 10 formed by laminating a thermoplastic resin film 10b (hereinafter also simply referred to as “film”) on a porous support 10a (hereinafter also simply referred to as “support”). This is a process of preparing and forming the opening 11 corresponding to the image by selectively heating the thermoplastic resin film 10b.

  The heat-sensitive stencil sheet 10 is not particularly limited as long as it is formed by laminating a thermoplastic resin film 10b on a porous support 10a, and even if both are bonded via an adhesive, both of them are heated. It may be directly bonded by bonding or the like.

  The thermoplastic resin film 10b is not particularly limited as long as it is heat-piercing or heat-shrinkable so that the opening 11 is formed by heating. For example, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate, Polybutylene terephthalate, polynaphthalene terephthalate, polysulfone sulfide, polystyrene, polyurethane, polycarbonate, polyvinyl acetate, acrylic resin, silicone resin and the like are used. These resin components may be used alone or in combination or as a copolymer. Among these, a polyester film such as polyethylene terephthalate is preferably used. The thickness of the thermoplastic resin film 10b is preferably in the range of 0.5 to 50 μm, and more preferably in the range of 1 to 20 μm.

The porous support 10a is not particularly limited as long as the dimensions do not change by heating at the time of plate making and the ink can pass at the time of printing, in addition to thin paper, papermaking, non-woven fabric, woven fabric, screen wrinkles, Examples thereof include continuous pores such as sponge sheets. Among these, it is preferable to use cocoons such as polyester, silk, cotton, nylon, rayon, and stainless steel. Japanese paper, the basis weight in the case of non-woven fabric is preferably in the range of from 1 to 20 g / m ^2, further is more preferably in the range of 5 to 15 g / m ^2, number of meshes in the case of gauze, 50 mesh to 450 A mesh range is preferable, and a range of 70 to 200 mesh is more preferable.

  As the heat-sensitive stencil sheet 10, a commercially available one can be used. Examples of such commercially available products include RISO Master Z Type 37, Z Type 77 or RISO Digital Screen Master 200P-32ASHQ, 200P-32, 70P-32 (all are trade names) manufactured by Riso Kagaku Corporation.

  As a method for selectively heating the thermoplastic resin film 10b of the heat-sensitive stencil sheet 10 to form the opening 11 corresponding to the image, it is possible to use a usual method used for making the heat-sensitive stencil sheet 10. it can.

  As such a plate making method, for example, an image formed of a substance that absorbs light such as carbon black or toner and generates heat is superimposed on the heat-sensitive stencil sheet 10, and an infrared lamp is used as the light source to form the heat-sensitive stencil sheet 10 In addition to the so-called flash plate making which irradiates light, there is a method of punching the heat-sensitive stencil sheet 10 corresponding to an image using a laser beam or a thermal head as a heat source. Among these, the thermal plate-making process of the present invention is preferably performed using a heating means that forms an aggregate of independent perforations corresponding to images on the thermoplastic resin film 10b, such as a thermal head.

(2. Masking process)
In the mask processing step of the present invention, as shown in FIG. 1 (a), the mask member 2 is filled from the opening 11 of the heat-sensitive stencil sheet 10 made by the heat-sensitive plate making step and mask processing is performed.

  When the opening 11 of the heat-sensitive stencil sheet 10 is filled with the mask member 2, as shown in FIG. 1A, the mask member 2 is projected upward from the surface of the support 10a using a screen printing operation from the film 10b side. Fill to maintain the state.

  The mask member 2 is particularly a non-curable fluid that is liquid at room temperature (25 ° C.), is filled in the opening 11 of the thermoplastic resin film 10 b of the heat-sensitive stencil sheet 10, and can be removed from the opening 11. It is not limited. Therefore, the mask member 2 desirably has flow characteristics suitable for screen printing so that the application operation to the heat-sensitive stencil sheet 10 can be easily performed, and does not hinder the curing of the reinforcing member 3 in the reinforcing member curing step. If it is.

  The physical properties required of the mask member 2 are the same as the printing using the squeegee 20 with the heat-sensitive stencil sheet 10 held in a hollow state, and filling the support 10a from the film 10b side of the heat-sensitive stencil sheet 10 Therefore, when passing through the support 10a, the viscosity in a state where a force is applied to the mask member 2 must be low. On the other hand, if the viscosity is too high, it will be difficult to pass through the opening 11 of the heat-sensitive stencil sheet 10, and a mask cannot be formed uniformly. Furthermore, after filling, it is necessary to quickly lose the fluidity and maintain the shape so that the mask 10 is deformed and the protection performance is not impaired by permeating and diffusing into the support 10a due to surface tension, causing bleeding, flow and deformation. That is, a material in which the three-dimensional shape of the mask member 2 is a material that is swept in the direction perpendicular to the film surface after filling from the opening 11 and corresponding to the shape of the opening 11 is appropriate.

  From this point of view, the physical properties of the mask member 2 include thixotropy sufficient to maintain the state in which the opening 11 is not mixed with the reinforcing member 3 during the reinforcing member application step. It must be a non-Newtonian fluid. Accordingly, it is preferable that the thixotropic condition has a higher viscosity and yield value than the reinforcing member 3. The viscosity of the mask member 2 is 10 to 1000 (Pa · s), preferably 10 to 100 (Pa · s). The yield value is 30 (Pa) or more, preferably 50 (Pa) or more.

  As such a mask member 2, for example, W / O emulsion ink can be used. Such W / O emulsion ink may or may not contain a coloring material. The viscosity and / or yield value of the W / O emulsion ink can be easily adjusted by changing the blending ratio of the oil phase and the water phase of the ink.

  Moreover, the mask member 2 may contain a viscosity modifier for adjusting the viscosity and / or the yield value. As a viscosity modifier, what was mentioned above regarding the reinforcing member 3 can be used. Further, the mask member 2 may contain a cleaning agent component such as a surfactant and a solvent so as to promote the removal of the film residue during the replacement operation. In order to make it easy to confirm replacement with the mask member 2, the reinforcing member 3 and the mask member 2 may be colored differently.

(3. Reinforcing member application process)
In the reinforcing member application step of the present invention, the film surface of the heat-sensitive stencil sheet 10 with the opening 11 masked by the mask member 2 as shown in FIG. In this process, the reinforcing member 3 is applied to the non-opening.

  When applying the reinforcing member 3 to the heat-sensitive stencil sheet 10, in order to prevent the mask member 2 from being removed in the mask member removing step, the surface of the mask member 2 opposite to the thermoplastic resin film 10b side is the reinforcing member. It is necessary to adjust the thickness of the reinforcing member 3 so as to maintain a state of protruding from the surface opposite to the surface opposite to the thermoplastic resin film 10b side in FIG.

The reinforcing member 3 is not particularly limited as long as it is liquid at room temperature (25 ° C.) and is impregnated into the porous support 10a and cured in the reinforcing member curing step. Furthermore, it is preferable that the reinforcing member 3 has a flexibility to withstand an impact at the time of printing after curing and a high elasticity and a tensile strength that do not cause elongation. In addition, the reinforcing member 3 is required to penetrate the support 10a quickly without deforming the mask member 2 at the time of application. That is, the relationship between the hardness H _M of the reinforcing member 3 and the hardness H _R of the mask member 2 is such that H _M <H _R in the reinforcing member 3 and the mask member 2 before curing in the reinforcing member curing step, which will be described later, and reinforcement after the curing step. In the member 3 and the mask member 2, H _M > H _R is satisfied.

  From this point of view, the characteristic condition of the reinforcing member 3 is that it is a Newtonian fluid having no structural viscosity, and specifically, 0.01 (Pa · s) or more and less than 10 (Pa · s) is preferable.

  As the reinforcing member 3, an ultraviolet reinforcing member, an infrared curable resin, a heat reinforcing member, a moisture curable resin, a thermoplastic resin, paraffins, a high frequency radio wave, a resin curable by various electron beams, or the like can be used. The reinforcing member 3 may appropriately contain a photoinitiator, a viscosity modifier, a polymerization initiator, and the like.

  Among these, the preferable reinforcement member 3 is mainly comprised from the oligomer or monomer of an ultraviolet curable resin. Examples of the oligomer or monomer include various oligomers and monomers of urethane-based, epoxy-based, polyester-based, and polyol-based (meth) acrylic acid-modified resins. As the oligomer, for example, epoxy acrylate, epoxy oil acrylate, urethane acrylate, unsaturated polyester, polyester acrylate, polyether acrylate, vinyl acrylate and the like can be preferably used. Monomers include monofunctional acrylates such as dicyclopentenyl ethyl acrylate, isobornyl acrylate, and phenol / ethylene oxide modified acrylate, tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, and bisphenol A diglycidyl ether diacrylate. Polyfunctional acrylates such as tetraethylene glycol diacrylate, trimethylylpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, and dipentaerythritol hexaacrylate can be preferably used.

  Another preferable reinforcing member 3 is a moisture curable silicone resin. The moisture curable silicone resin is not particularly limited as long as it is cured by chemically reacting with moisture in the air or OH groups on the surface of the substance. Examples of the moisture curable silicone resin include moisture curable silicone rubber. Specific examples of moisture-curing silicone rubber include “TSE-399 (trade name)” manufactured by Momentive Performance Materials Japan GK.

  The application of the reinforcing member 3 is not particularly limited as long as the reinforcing member 3 can be uniformly applied to the entire surface of the porous support 10a and the mask member 2 is not damaged. After the reinforcing member 3 is uniformly impregnated on the entire surface of the porous support 10a, it is preferable to remove the excess reinforcing member 3.

(4. Reinforcing member curing process)
In the curing step of the present invention, as shown in FIG. 1 (c), the reinforcing member 3 applied to the non-opening portion of the heat-sensitive stencil sheet 10 in the reinforcing member application step is a process of curing.

  The reinforcing member curing step can be performed by irradiating the heat-sensitive stencil sheet 10 with ultraviolet rays, infrared rays, heat or the like according to the reinforcing member 3 to be used. Further, when the reinforcing member 3 is a moisture curable silicone resin, it is cured in the porous support 10a of the heat-sensitive stencil base paper 10 in the air or in the support 10a or the mask member 2 and cured. This step can be performed by impregnating the porous support 10a with the resin and leaving it alone.

(5. Mask member removal step)
The mask member removing step according to the present invention is a process of removing the mask member 2 filled in the opening 11 after the reinforcing member 3 is cured as shown in FIG.

  In the mask member removing step, it can be removed by washing. The cleaning agent used at that time can be appropriately selected from water, an organic solvent, and the like. At that time, a drug such as a surfactant may be used in combination. Further, depending on the hardness of the reinforcing member 3, the reinforcing member 3 can be cleaned using a brush or a scrubber. The screen printing plate 1 obtained by the plate making method of the present invention has a non-opening portion reinforced and has improved solvent resistance. Therefore, the screen printing plate 1 can be sufficiently washed with an organic solvent. High-quality printing can be performed over a long period of time using a plate.

  By removing the mask member by the mask member removing step, the reinforcing member layer 3 in the screen printing plate has a through hole portion 4 having an inner peripheral wall perpendicular to the film surface in a shape corresponding to the opening portion 11 (that is, The shape of the filled mask member 2 is shaped like an outer peripheral surface in the three-dimensional shape), whereby the boundary portion between the opening 11 and the non-opening is reinforced.

  Further, when the ink used at the time of printing is used as the mask member 2, the screen printing operation is performed by placing the ink used at the time of printing on the support 10a side. Accordingly, the mask member 2 can be removed by transferring the ink functioning as the mask member 2 to the printing medium simultaneously with the printing process, and thus the mask member removing step can be omitted.

  The screen printing plate 1 thus obtained has a durability equal to or higher than that of the screen printing plate 1 obtained by using the photosensitive emulsion, and therefore screen printing can be performed using the same method and equipment. . Moreover, since the solvent resistance is superior to the screen printing plate 1 obtained by the conventional thermal plate making, it is possible to perform printing by selecting a wider range of inks than conventional ones such as solvent-based inks and UV inks.

  As described above, the method for reinforcing the screen printing plate 1 according to the present invention selectively heats the thermoplastic resin film surface of the heat-sensitive stencil sheet 10 in which the thermoplastic resin film 10b is laminated on the porous support 10a. Then, the opening 11 corresponding to the image is formed to make the heat-sensitive stencil sheet 10, and the non-opening portion of the heat-sensitive stencil sheet 10 is filled with the mask member 2 to perform mask processing. Next, after arranging the film surface of the heat-sensitive stencil sheet 10 with the opening 11 masked by the mask member 2 to be the back surface, applying the reinforcing member 3 to the non-opening from the support 10a side and curing it. Then, a process of removing the mask filled in the opening 11 is performed.

  Thereby, in order to reinforce the screen printing plate 1 by the reinforcing member 3 in a state where the opening 11 is protected by the mask member 2, the opening 11 is formed by closing the opening 11 with the reinforcing material. Problems such as a decrease in coating film pressure due to a change in ink passage resistance and image degradation such as occurrence of color unevenness can be solved. In particular, even when the opening 11 is formed of a fine character portion or a fine wire portion, no chipping of fine characters or skipping of the fine wire does not occur, so that higher-accuracy screen printing can be realized.

  Further, since the screen printing plate 1 obtained by the reinforcing method of the present invention is sufficiently reinforced, the plate can be reused unlike the conventional thermal screen printing plate, and the same plate is used for a long time. High-quality printing can be performed. Furthermore, since the portion of the opening 11 is reinforced by the reinforcing member 3, even if the film 10b is peeled (delaminated) from the support 10a, the shape of the opening 11 is maintained, Printing without image quality deterioration can be performed.

  Further, the hardness of the mask member 2 and the reinforcing member 3 is higher in the mask member 2 than in the reinforcing member 3 during the reinforcing member application step, and the reinforcing member 3 is higher in hardness than the mask member 2 after the reinforcing member curing step. Therefore, the mask processing of the opening 11 can be reliably performed without damaging the mask member 2 when applying the reinforcing member.

  Further, the reinforcing member 3 is applied so that the surface of the mask member 2 opposite to the thermoplastic resin film 10b side is protruded from the surface of the reinforcing member 3 opposite to the thermoplastic resin film 10b side. Thus, the mask member 2 can be reliably removed without the mask member 2 remaining in the opening 11.

  By the way, in the mask processing step in the reinforcing method of the screen printing plate 1 described above, the mask member 2 is projected upward from the surface of the support 10a as shown in FIG. 1, but the reinforcing member 3 is not necessarily provided in the support 10a. It is not necessary to impregnate the entire thickness. That is, the method for reinforcing the screen printing plate 1 according to the present invention can provide a reinforcing effect if the reinforcing member 3 is applied even in a small amount in the vicinity of the boundary between the film 10b and the support 10a in the opening 11, and therefore at least the mask member. The surface on the opposite side to the thermoplastic resin film 10b side in 2 should just protrude rather than the surface on the opposite side to the thermoplastic resin film 10b side in the reinforcement member 3.

  As a specific example of this method, for example, as shown in FIG. 2 (a), next, as shown in FIG. 2 (b), the reinforcing member 3 is sprayed on the support 10a with a sprayer 30 such as a spray. About half of the reinforcing member layer 3 is formed. At this time, the spray amount is adjusted as appropriate so that the surface of the mask member 2 protrudes upward from the surface of the reinforcing member layer 3. Then, after the reinforcing member 3 is cured as shown in FIG. 2C, the mask member 2 is removed as shown in FIG.

  Even when this method is adopted, as shown in FIG. 3A, the surface of the mask member 2 opposite to the thermoplastic resin film 10b side is the surface of the reinforcing member 3 opposite to the thermoplastic resin film 10b side. Since the reinforcing member 3 is applied so as to maintain a more protruding state, the reinforcing member 3 can be easily removed, and the mask member 2 is removed from the opening 11 as shown in FIG. In this case, the reinforcing member layer 3 is formed with a through hole portion 4 having an inner peripheral wall perpendicular to the film surface in a shape corresponding to the opening portion 11.

  Hereinafter, the reinforcing method of the screen printing plate 1 according to the present invention will be described in detail based on examples. It should be noted that the following examples do not limit the present invention, and any design changes in light of the gist of the preceding and following descriptions are within the technical scope of the present invention.

  In each of the following examples, Examples 1 to 3 are examples using ink as the mask member 2, and Examples 4 to 6 are examples using a member other than ink as the mask member 2. In Examples 1 to 3 and Examples 4 to 6, the same mask member 2 is used, and the type of the reinforcing member 3 is different.

[Example 1]
(1. Thermal plate making process)
Using RISO Digital Plate Making Machine SP400D (Ideal Science) as the plate making machine and RISO Digital Screen Master 200P-32 (made by Ideal Science) as the thermal stencil base paper 10, respectively, and mounting the thermal stencil base paper 10 on the plate making machine according to the procedure of the apparatus . Next, the prepared original was placed on a scanner, and thermal plate making was performed for about 30 seconds to obtain a digital screen plate (heat-sensitive stencil sheet 10) in which the black portion of the original was perforated. This was mounted on a simple screen frame (made by Riso Kagaku).

(2. Masking process)
20 g of screen ink (black) for a litho cloth is taken on the film 10b side of the framed thermal stencil sheet 10 and squeegee processing is manually performed 10 times using a rubber squeegee with a hardness of 40 while the thermal stencil sheet 10 is held hollow. went. After collecting the surplus ink, the heat-sensitive stencil sheet 10 is turned over and the plate surface on the support 10a side is visually confirmed. Black ink is pushed out from the opening 11 to the support 10a side, and the same image as the original is formed. Was confirmed.

(3. Reinforcing member application process)
An ultraviolet curable resin was put into a hand spray and sprayed uniformly over the entire support 10a side of the heat-sensitive stencil sheet 10. At this time, if the spray was excessive, the liquid of the reinforcing material was formed, the plate was uneven, and the mask portion covered and concealed the mask, so the whole was kept wet. In addition, the reinforcement member 3 was applied so that the surface of the mask member 2 opposite to the thermoplastic resin film 10b side was protruded from the surface of the reinforcement member 3 opposite to the thermoplastic resin film 10b side. .

  Moreover, as an ultraviolet curable resin used in this Example, epoxy acrylate oligomer (manufactured by Harima Chemicals Co., Ltd.) 9% by weight, dipentaerythritol hexaacrylate (DPHA: manufactured by Toagosei Co., Ltd.) 38.2% by weight , 38.2% by weight of phenol / ethylene oxide modified acrylate (manufactured by Toagosei Co., Ltd.), Irgacure 369 (manufactured by Ciba Geigy) as a photoinitiator, and Benton 38 (manufactured by RHEOX) as a viscosity modifier 10% by weight, 1% by weight of Solsperse S24000GR (manufactured by Zeneca) as a dispersant, and 0.1% by weight of hydroquinone as a polymerization inhibitor are stirred and mixed with a stirrer, and then mixed with a three-roll mixer and reacted. What adjusted curable resin was used.

(4. Reinforcing member curing process)
After spraying the ultraviolet curable resin, the resin was cured by irradiation with ultraviolet rays for 30 seconds using a handy UV irradiation device (OHD-320: manufactured by ORC).

  In this embodiment, since the ink is used as the mask member 2, a printing process is performed as the mask member removing step.

(Printing performance)
30 g of screen ink (black) for litho cloth was taken and printed on a T-shirt using the rubber squeegee used in the masking process. As a result, a good printed matter without clogging or the like was obtained.

(Durability)
Using the plate produced as described above, printing was performed on a plywood having a size of 10 × 10 cm and a thickness of 7 mm using screen printing ink (black). Although 30 sheets were printed, the image did not deteriorate. Further, printing was performed 100 times while replenishing ink, and the plate surface was confirmed. However, pinholes, plate wear, etc. were not observed.

(Storage performance)
After the printing was completed, excess ink was removed, the plate was washed with a screen cleaner (clean coal), dried, and stored in a room temperature room for 2 weeks. Printing was performed again on this T-shirt using this plate, but no image deterioration such as clogging, chipping or background staining was observed.

(Comparison with conventional products)
As a comparison object, the above-described printing was performed using a screen printing plate in which a digital screen master (200P-32) was made by a conventional method without using the reinforcing method of the present invention. As a result, the third sheet was in contact with the end face of the plywood. The film 10b to be broken was torn and the ink stained the plate. On the 10th sheet, pinholes were found on the entire plywood contact surface, and the image was soiled. From this result, it was proved that the screen printing plate 1 was reinforced without image deterioration by using the reinforcing method of the present invention.

[Example 2]
(1. Thermal plate making process)
The same heat-sensitive stencil making process as in Example 1 was performed to obtain a heat-sensitive stencil sheet 10 in which a desired opening 11 was formed.

(2. Masking process)
The same masking process as in Example 1 was performed to obtain a heat-sensitive stencil sheet 10 in which the opening 11 was masked.

(3. Reinforcing member application process)
A moisture curable liquid silicone resin (TSE399 transparent: Momentive Performance Materials Japan) was poured into the heat-sensitive stencil sheet 10 from the support 10a side of the heat-sensitive stencil sheet 10 using a hand dispenser.

(4. Reinforcing member curing process)
After flowing down the liquid silicone rubber, the plate was left standing for 30 minutes with the plate upright, and the resin penetrated into the support 10a portion of the heat-sensitive stencil paper 10 and cured into a rubber. Excess resin flowed down and was cured at the frame portion.

  In this example, as in Example 1, since ink was used as the mask member 2, a printing process was performed as a mask member removal step.

(Printing performance)
30 g of screen ink (black) for litho cloth was taken and printed on a T-shirt using the rubber squeegee used in the masking process. As a result, a good printed matter without clogging or the like was obtained.

  The same results as in Example 1 were obtained for both durability performance and storage performance. From the above, it is shown that the screen printing plate 1 is reinforced without image deterioration by using the reinforcing method of the present invention.

[Example 3]
(1. Thermal plate making process)
The same heat-sensitive stencil making process as in Examples 1 and 2 was performed to obtain a heat-sensitive stencil sheet 10 having a desired opening 11 formed therein.

(2. Masking process)
The same masking process as in Examples 1 and 2 was performed to obtain a heat-sensitive stencil sheet 10 in which the opening 11 was masked.

(3. Reinforcing member application process)
Using a two-pack type silicone resin for mold making (Quick Silicone: Nissin Resin Co., Ltd.) as the reinforcing member 3, the main agent and the curing agent were sufficiently mixed and then sprayed onto the heat-sensitive stencil sheet 10 by hand spraying.

(4. Reinforcing member curing process)
It was allowed to stand at room temperature for about 30 minutes, and it was confirmed that the reinforcing member 3 was cured into a rubber and became free of touch.

  In this example, as in Examples 1 and 2, since ink was used as the mask member 2, a printing process was performed as a mask member removal step.

(Printing performance)
30 g of screen ink (black) for litho cloth was taken and printed on a T-shirt using the rubber squeegee used in the masking process. As a result, a good printed matter without clogging or the like was obtained.

  The same results as in Examples 1 and 2 were obtained for both durability performance and storage performance. From the above, it is shown that the screen printing plate 1 is reinforced without image deterioration by using the reinforcing method of the present invention.

[Example 4]
(1. Thermal plate making process)
The same heat-sensitive stencil making process as in Examples 1 to 3 was performed to obtain a heat-sensitive stencil sheet 10 having a desired opening 11 formed therein.

(2. Masking process)
20 g of toothpaste (guard halo: Kao) is taken on the film 10b side of the framed heat-sensitive stencil sheet 10 and manually squeegeeed 10 times using a rubber squeegee with a hardness of 40 while the heat-sensitive stencil sheet 10 is held hollow. It was. After collecting the excess paste, when the heat-sensitive stencil sheet 10 is turned over and the master surface on the support 10a side is visually confirmed, the white paste is pushed out from the opening 11 to the support 10a side, and the same image as the original is formed. Was confirmed.

(3. Reinforcing member application process)
The ultraviolet curable resin used in Example 1 was put into the hand spray and sprayed uniformly over the entire support 10a side of the heat-sensitive stencil sheet 10. At this time, if the spray was excessive, the liquid of the reinforcing material was formed, the plate was uneven, and the mask portion covered and concealed the mask, so the whole was kept wet. In addition, the reinforcement member 3 was applied so that the surface of the mask member 2 opposite to the thermoplastic resin film 10b side was protruded from the surface of the reinforcement member 3 opposite to the thermoplastic resin film 10b side. .

(4. Reinforcing member curing process)
After spraying the ultraviolet curable resin, the resin was cured by irradiation with ultraviolet rays for 30 seconds using a handy UV irradiation device (OHD-320: manufactured by ORC).

(5. Mask member removal step)
When the heat-sensitive stencil sheet 10 having been reinforced was washed with a soft sponge, the toothpaste was quickly dissolved and removed. Since the curing agent becomes yellowish brown after UV curing, the transparent opening 11 can be easily visually confirmed, and it has been confirmed that a good production and sales state without clogging is maintained.

(Printing performance)
30 g of screen ink (black) for litho cloth was taken and printed on a T-shirt using the rubber squeegee used in the masking process. As a result, a good printed matter without clogging or the like was obtained.

  Moreover, the result similar to Examples 1-3 was obtained in both durable performance and storage performance. From the above, it is shown that the screen printing plate 1 is reinforced without image deterioration by using the reinforcing method of the present invention.

[Example 5]
(1. Thermal plate making process)
The same heat-sensitive stencil making process as in Examples 1 to 4 was performed to obtain a heat-sensitive stencil sheet 10 having a desired opening 11 formed therein.

(2. Masking process)
The same master processing step as in Example 4 was performed to obtain a heat-sensitive stencil sheet 10 in which the opening 11 was masked.

(3. Reinforcing member application process)
A moisture curable liquid silicone resin (TSE399 transparent: Momentive Performance Materials Japan) was poured into the heat-sensitive stencil sheet 10 from the support 10a side of the heat-sensitive stencil sheet 10 using a hand dispenser.

(4. Reinforcing member curing process)
After flowing down the liquid silicone rubber, the plate was left standing for 30 minutes with the plate upright, and the resin penetrated into the support 10a portion of the heat-sensitive stencil paper 10 and cured into a rubber. Excess resin flowed down and was cured at the frame portion.

(5. Mask member removal step)
The mask member 2 was removed in the same manner as in Example 4. The transparent opening 11 was easily visually confirmed, and it was confirmed that a good production and sales state without clogging or the like was maintained.

(Printing performance)
30 g of screen ink (black) for litho cloth was taken and printed on a T-shirt using the rubber squeegee used in the masking process. As a result, a good printed matter without clogging or the like was obtained.

  Moreover, the result similar to Examples 1-3 was obtained in both durable performance and storage performance. From the above, it is shown that the screen printing plate 1 is reinforced without image deterioration by using the reinforcing method of the present invention.

[Example 6]
(1. Thermal plate making process)
The same heat-sensitive stencil making process as in Examples 1 to 5 was performed to obtain a heat-sensitive stencil sheet 10 in which a desired opening 11 was formed.

(2. Masking process)
The same masking process as in Examples 1 to 5 was performed to obtain a heat-sensitive stencil sheet 10 in which the opening 11 was masked.

(3. Reinforcing member application process)
Using a two-pack type silicone resin for mold making (Quick Silicone: Nissin Resin Co., Ltd.) as the reinforcing member 3, the main agent and the curing agent were sufficiently mixed and then sprayed onto the heat-sensitive stencil sheet 10 by hand spraying.

(4. Reinforcing member curing process)
It was allowed to stand at room temperature for about 30 minutes, and it was confirmed that the reinforcing member 3 was cured into a rubber and became free of touch.

(5. Mask member removal step)
The mask member 2 was removed in the same manner as in Examples 4 and 5. The transparent opening 11 was easily visually confirmed, and it was confirmed that a good production and sales state without clogging or the like was maintained.

(Printing performance)
30 g of screen ink (black) for litho cloth was taken and printed on a T-shirt using the rubber squeegee used in the masking process. As a result, a good printed matter without clogging or the like was obtained.

  Moreover, the result similar to Examples 1-5 was obtained in both durability performance and storage performance. From the above, it is shown that the screen printing plate 1 is reinforced without image deterioration by using the reinforcing method of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Screen printing plate 2 ... Mask member (mask member layer)
3. Reinforcing member (reinforcing member layer)
4 ... Through hole part 10 ... Sensitive stencil paper (10a ... porous support, 10b ... thermoplastic resin film)
11 ... opening 20 ... squeegee 30 ... sprayer

Claims (5)

A method for reinforcing a screen printing plate, wherein an opening corresponding to an image is formed by selectively heating the thermoplastic resin film in a heat-sensitive stencil sheet in which a thermoplastic resin film is laminated on a porous support,
From the thermoplastic resin film side, a mask processing step of filling and masking a mask member having thixotropy in a portion corresponding to the opening of the opening and the porous support of the thermoplastic resin film; and
A reinforcing member applying step of applying a reinforcing member from the porous support side of the heat-sensitive stencil sheet and impregnating the reinforcing member into the porous support corresponding to a non-opening portion of the thermoplastic resin film;
A reinforcing member curing step for curing the reinforcing member impregnated in the porous support corresponding to the non-opening;
A mask member removing step of removing the mask member filled in the mask processing step;
A method for reinforcing a screen printing plate, comprising: The relationship between the hardness H _{M of the} reinforcing member and the hardness H _{R of the} mask member is that H _M <H _R before the reinforcing member curing step and H _M > H _R after the reinforcing member curing step. The method for reinforcing a screen printing plate according to claim 1, wherein: In the reinforcing member application step, the surface of the mask member on the opposite side to the thermoplastic resin film side is maintained so as to protrude from the surface of the reinforcing member on the opposite side of the thermoplastic resin film side. 3. The method for reinforcing a screen printing plate according to claim 1, wherein a reinforcing member is applied. Using an ink having thixotropy as the mask member in the mask processing step,
4. The method for reinforcing a screen printing plate according to claim 1, wherein a squeegeeing operation using a squeegee is performed on the ink filled in the mask processing step as the mask member removing step. . A through hole having an inner peripheral wall perpendicular to the surface of the thermoplastic resin film in the reinforcing member layer made by the reinforcing method according to claim 1 and cured by the reinforcing member is formed in the opening. A screen printing plate characterized by being formed in a corresponding shape.

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