Screen plate

Abstract

To provide a screen plate having excellent printing accuracy.SOLUTION: A screen plate for screen printing comprising: a plate frame; a screen for support having an outer peripheral portion fixed to the plate frame; and a printing screen having an outer peripheral portion fixed to the screen for support, wherein the screen for support is made of an n / m twill woven fabric, and n and m are each independently an integer of 2 or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a screen printing plate used in the field of precision pattern formation related to electronics, such as the phosphor printing process in the manufacture of PDPs (plasma displays), electrode printing for solar cells, liquid crystal seal printing, hole filling printing for substrates, printing of capacitor electrodes and dielectrics, and resist printing for TAB (Tape Automated Bonding) and COF (Chip on Flexible). [Background technology]

[0002] Generally, a screen printing plate used in screen printing is constructed by forming openings of a predetermined shape (openings corresponding to the print pattern) in a mesh screen fixed to a frame under a predetermined tension using a photosensitive resin (emulsion) or a metal plate, and then filling the openings with ink (paste). The ink-filled screen is placed at a certain distance (clearance) from the surface to be printed, and the screen's elastic deformation is used to temporarily bring it into contact with the surface to be printed, and then it is immediately separated from the surface based on its restoring force, thereby applying the ink (paste) that fills the print pattern to the surface to be printed. In a screen printing plate, a certain tension is applied to the screen fixed to the frame in order to ensure the screen's ability to quickly separate from the surface to be printed (plate releasability).

[0003] The screen plates used in this screen printing include "full-surface plates," in which a single type of screen made of synthetic or metal fibers is fixed to a frame, as well as "combination screen plates" and "metal mask plates."

[0004] "Combination screen plates" and "metal mask plates" are screen plates that have two screens: a support screen whose outer periphery is fixed to a screen frame, and a printing screen whose outer periphery is fixed to the support screen. "Combination screen plates" use fabric for both the support screen and the printing screen, while "metal mask plates" use fabric for the support screen but a metal plate for the printing screen.

[0005] "Combination screen plates" and "metal mask plates" can be manufactured, for example, by stretching a woven fabric, which is the raw material for the support screen, onto a frame, adhering a printing screen to the center of the frame, and then removing the central portion of the woven fabric (the raw material for the support screen) that overlaps the printing screen. "Combination screen plates" are used for screen printing by applying a photosensitive resin to a printing screen (a screen made of woven fabric), and then exposing predetermined areas of the applied photosensitive resin to light to form openings of predetermined shapes for filling ink into the photosensitive resin. On the other hand, "metal mask plates" are used for screen printing by forming openings of predetermined shapes in advance in a printing screen (a screen made of a metal plate) using etching or a laser, etc., and using these openings as openings for filling ink.

[0006] In combination screen plates and metal mask plates, the support screen is made of a woven fabric structure made of a material with high elasticity, i.e., a low Young's modulus, so that the support screen bears the stretch caused by the clearance during printing, and the printing screen is made of a woven fabric structure made of metal fibers (Patent Document 1) or a metal plate, etc., which are materials with a high Young's modulus so that deformation of the image pattern is reduced (Patent Document 2). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-177262 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-062225 Summary of the Invention [Problem to be solved by the invention]

[0008] In combination screen plates and metal mask plates, the support screen must bear the elongation caused by clearance during printing, and therefore must have a Young's modulus at least lower than that of the printing screen. However, when a conventional support screen made of nylon fiber, polyester fiber, or the like is used, the Young's modulus of the support screen becomes too low, resulting in a weak resistance to misalignment of the image-forming area caused by frictional forces accompanying the sliding of the squeegee during printing, and there is a problem in that sufficient printing precision cannot be obtained.

[0009] The present invention has been made to solve such conventional problems, and has an object to provide a screen printing plate having excellent printing accuracy. [Means for solving the problem]

[0010] The gist of the present invention is as follows. [1] A screen printing screen comprising a frame, a support screen whose outer periphery is fixed to the frame, and a printing screen whose outer periphery is fixed to the support screen, wherein the support screen is made of an n / m twill fabric, and the n and m are each independently an integer of 2 or greater. [2] The screen plate according to [1], wherein n and m are each independently an integer of 5 or less. [3] The screen plate according to [1] or [2], wherein n and m are the same integer. [4] A screen plate according to any one of [1] to [3], characterized in that the support screen is a woven fabric made of synthetic fibers. [5] A screen plate according to any one of [1] to [4], characterized in that the printing screen is a woven fabric made of metal fibers and the screen plate is a combination screen plate. [6] A screen plate according to any one of [1] to [4], characterized in that the printing screen is made of a metal plate and the screen plate is a metal mask plate. [Effects of the Invention]

[0011] According to the present invention, a screen printing plate having excellent printing accuracy can be provided. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram of a screen plate (combination screen plate). [Figure 2] FIG. 1 is an explanatory diagram illustrating how to use a screen plate (combination screen plate). [Figure 3] FIG. 1 is a schematic diagram of a screen plate (metal mask plate). [Figure 4] FIG. 2 is a diagram illustrating an opening formed in a glass substrate. [Figure 5] 10 is a graph showing the amount of misalignment for the tenth printed item. [Figure 6] 10 is a graph showing the amount of misalignment for the 3000th print. [Figure 7] This is a partial enlargement of a 2 / 1 twill weave fabric (a) and a plain weave fabric (b). DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described in detail.

[0014] First, the screen plate of this embodiment will be described with reference to Fig. 1. The screen plate 100 shown in Fig. 1 is a combination screen plate in which woven fabrics are used for both the support screen 103 and the printing screen 102.

[0015] The screen plate 100 of this embodiment has a plate frame 101, a support screen 103, and a printing screen .

[0016] The support screen 103 has an outer periphery 103a fixed to the frame 101. The printing screen 102 has an outer periphery 102a fixed to the support screen 103. More specifically, the area where the outer periphery 102a of the printing screen 102 is fixed is the inner periphery 103b of the support screen 103. Here, the outer periphery refers to the peripheral area including the outer periphery, and the inner periphery refers to the peripheral area including the inner periphery.

[0017] 1, the printing screen 102 is disposed in the center of the area surrounded by the frame 101, and the support screen 103 is disposed around the printing screen 102 within the area surrounded by the frame 101. In other words, the screen printing plate 100 of this embodiment has a structure in which the printing screen 102, which is an inner mesh, is supported by the frame 101 via the support screen 103, which is an outer mesh.

[0018] The screen frame 101 has the important function of applying and maintaining tension (for example, 21 N / cm to 36 N / cm) to the screens 102 and 103, and is formed rectangular so that the screens 102 and 103 can be tensioned. The screen frame 101 is also attached to the printing press and plays a role in preventing ink from leaking during printing. The screen frame 101 is generally made of wood, resin, or a square pipe or die-cast metal made of aluminum, aluminum alloy, steel, iron alloy, or other metal. Of these, aluminum alloys are particularly widely used because they are lightweight and have improved strength, chemical resistance, and processability.

[0019] The frame 101 used in this embodiment can be made of any material, but to achieve excellent printing precision, it is desirable to use metals such as aluminum alloys or iron alloys, which are stable against high tension, have high strength, and are less likely to deform when exposed to changes in temperature and humidity.If a frame made of joined metal square pipes is used, it is desirable to use pipes that are thicker or have ribs on the inside for reinforcement.

[0020] The printing screen 102 is made of a mesh (woven fabric) made of woven fibers (warp and weft). For particularly high-definition printing, i.e., for screen printing to form a fine print pattern, it is preferable to use a metal mesh made of woven metal fibers with a thread diameter of 20 μm or less as the printing screen 102. In this specification, the fine print pattern includes, for example, electrode wiring.

[0021] The fiber density of the printing screen 102 is not particularly limited, but is preferably 400 mesh or more from the viewpoint of improving resolution. Metal fibers that can be used for the printing screen 102 include stainless steel and high-strength tungsten fibers. The fibers (warp and weft) that make up the printing screen 102 are not limited to metal fibers, and high-strength synthetic fibers, glass fibers, combinations or composites of these materials, and materials that can be made into fibers may also be used.

[0022] The Young's modulus of the printing screen 102 is not particularly limited, but from the viewpoint of improving printing accuracy, it is preferably 2000 N / mm 2 In this specification, the Young's modulus can be determined from an SS curve (stress-strain curve) obtained by a tensile test using the printing screen 102 or the support screen 103.

[0023] The function of the support screen 103 in the screen plate 100 of this embodiment is to bear the external forces applied to the printing screen 102 during printing, thereby minimizing deformation of the printing screen 102 and achieving highly accurate printing.

[0024] The support screen 103 used in the screen printing plate 100 of this embodiment is a woven fabric composed of warp and weft threads. Synthetic fibers are preferably used for the warp and weft threads to ensure sufficient elongation to withstand the external forces applied to the printing screen 102 during printing. The synthetic fibers are not particularly limited, and examples include fluorine-based fibers, polyethylene terephthalate, polypropylene, 6-nylon, 66-nylon, polyethylene, ethylene-vinyl acetate copolymer, polycarbonate, polyphenylene sulfide (PPS), polyethylene naphthalate, polyether ether ketone, and modified polyphenylene ether (PPE). Other examples include aramid, polyarylate, ultra-high molecular weight polyethylene, polyparaphenylene benzobisoxazole (PBO), polyparaphenylene benzobisthiazole (PBT), polyparaphenylene benzobisimidazole (PBI), carbon fiber, other liquid crystal polymers, and two or more materials, such as core-sheath composite fibers. Alternatively, the woven fabric may be laminated with one or more synthetic resin films to form a film or sheet-like woven fabric composite in which the woven fabric and the synthetic resin are integrated together.

[0025] The synthetic fibers that can be used in the support screen 103 may be monofilament or multifilament, or may be a combination of multifilament warp and monofilament weft. The cross-sectional shape of the synthetic fibers that can be used in the support screen 103 may be any shape, including the usual round cross section, as well as flat, hollow, porous, triangular, cross, or other irregular cross sections.

[0026] The diameter of the fibers (warp and weft) constituting the support screen 103 is not particularly limited, but can be, for example, 20 μm to 100 μm, and from the viewpoint of adhesion to the inner mesh, it is preferably 35 μm to 70 μm. The density of the fibers in the support screen 103 is not particularly limited, but from the viewpoint of adhesion to the inner mesh, it is preferably 100 to 300 mesh.

[0027] The fabric constituting the support screen 103 is an n / m twill fabric, where n and m are each independently an integer of 2 or greater. Here, the n / m twill refers to a twill weave in which the warp threads pass over n weft threads and then repeatedly pass under m weft threads (or the weft threads pass over n warp threads and then repeatedly pass under m warp threads). Note that the twill weave is characterized by the fact that the areas 103c where the warp threads pass over the weft threads (or the weft threads pass over the warp threads) are offset by a predetermined distance in the vertical direction between adjacent warp threads (or in the horizontal direction between adjacent weft threads), forming a linear (strip-like) pattern called a twill that is inclined relative to the warp and weft threads.

[0028] The support screen 103 shown in Fig. 1 is made of a 2 / 2 (n = 2, m = 2) twill fabric. As shown in the partially enlarged view of Fig. 1, in a 2 / 2 twill fabric, the warp threads pass over two weft threads and then under two weft threads, repeatedly (or the weft threads pass over two warp threads and then under two warp threads, repeatedly).

[0029] By constructing the support screen 103 from an n / m (n and m are independently integers greater than or equal to 2) twill fabric, the Young's modulus of the support screen 103 is increased compared to a plain weave (a weave in which n and m are 1) or a 2 / 1 twill fabric. A higher Young's modulus of the support screen 103 reduces the support screen 103's resistance to deformation (i.e., the support screen 103 is less likely to stretch) even when an external force is applied to the printing screen 102 during printing. Therefore, with the screen printing plate 100 of this embodiment, the printing screen is less likely to shift in a direction parallel to the surface to be printed during screen printing, making it easier to form a print pattern in the desired position and suppressing deformation of the print pattern due to shifting of the printing screen on the surface to be printed. Additionally, a higher Young's modulus of the support screen 103 allows the printing screen 102 to more quickly separate from the surface to be printed during printing, thereby enabling a smaller distance (clearance) between the printing screen 102 and the surface to be printed. Therefore, the screen plate 100 of this embodiment enables highly accurate printing.

[0030] As shown in Figure 7(a), a 2 / 1 twill fabric is a twill fabric (n=2, m=1) in which the warp thread passes over two weft threads and then under one weft thread (or the weft thread passes over two warp threads and then under one warp thread), while a plain weave is a fabric (n=1, m=1) in which the warp thread passes over one weft thread and then under one weft thread, as shown in Figure 7(b).

[0031] The Young's modulus of the support screen 103 may be in a range capable of withstanding the external force applied to the printing screen 102 during printing (i.e., in a range lower than the Young's modulus of the printing screen 102), and the higher the Young's modulus within the range capable of withstanding the external force applied to the printing screen 102 during printing, the more preferable it is. From the viewpoint of plate release, the Young's modulus of the support screen 103 is 800 N / mm 2It is preferable that the breaking strength of the support screen 103 is 500 N / 5 cm or more from the viewpoint of making it less likely to break due to tension applied to the screens 102, 103 or external forces applied to the printing screen 102 during printing. The higher the breaking strength of the support screen 103, the more preferable it is, but the upper limit can be set to, for example, 1000 N / 5 cm. In this specification, the breaking strength can be obtained from a tensile test in accordance with JIS L1096.

[0032] The fabric constituting the support screen 103 may be an n / m (n and m are independently integers of 2 or greater) twill fabric, where n and m may be the same or different integers, but more preferably n and m are the same integer. When n and m are the same integer, there is no distinction between the front and back of the support screen 103, improving handleability.

[0033] In the woven fabric constituting the support screen 103, the larger the values ​​of n and m, the less bending of the threads, and therefore the mechanical properties such as Young's modulus and strength of the support screen 103 are improved. For this reason, the larger n and m are, the better; however, if n and m are too large, thread misalignment, in which the warp threads are displaced horizontally or the weft threads are displaced vertically, is more likely to occur. For this reason, n and m are preferably integers of 5 or less. Note that thread bending refers to the bending of the warp threads in the vertical direction as they pass through the weft threads, or the bending of the weft threads in the vertical direction as they pass through the warp threads.

[0034] From the viewpoint of further improving printing accuracy, particularly preferred combinations of n and m are the combination of 2(n) and 2(m) and the combination of 3(n) and 3(m).

[0035] The screen printing plate 100 of this embodiment is used in screen printing to form a print pattern on a surface to be printed. The method of using the screen printing plate 100 of this embodiment in screen printing is the same as that of a conventionally known screen printing plate, and is not particularly limited, but for example, the following method can be used.

[0036] First, as shown in Fig. 2, photosensitive resin 200 is applied to the printing screen 102 of the screen plate 100. Then, predetermined regions of the applied photosensitive resin are exposed to light to harden the photosensitive resin 200 and form openings 200a in the photosensitive resin 200. Note that the photosensitive resin 200 may be a negative photosensitive resin in which the exposed regions are more likely to dissolve in a developer, or a positive photosensitive resin in which the exposed regions are less likely to dissolve in a developer.

[0037] Next, ink I is filled into the openings 200a formed in the photosensitive resin 200, and the ink I is held on the printing screen 102 exposed from the openings 200a. Then, the squeegee S is pressed against the printing screen 102 and moved so that the printing screen 102 holding the ink I comes into contact with the printing surface P. As the squeegee S moves, the printing screen 102 that was pressed against the printing surface P moves away from the printing surface P, and the ink I held on the printing screen 102 is transferred to the printing surface P. Through these processes, a printing pattern PT can be formed using the screen printing plate 100 of this embodiment.

[0038] Next, a method for manufacturing the screen plate 100 of this embodiment will be described.

[0039] The screen printing plate 100 of this embodiment can be manufactured by a manufacturing method including a first fixing step of fixing the outer periphery (the portion corresponding to the outer periphery 103a of the support screen 103) to the printing frame 101 while applying a predetermined tension to an n / m (n and m are independently integers of 2 or greater) twill fabric (the raw material of the support screen 103); a second fixing step of overlapping the printing screen 102 on the twill fabric stretched on the printing frame 101 and fixing the outer periphery 102a to the twill fabric; and a removal step of removing a portion of the twill fabric overlapping the printing screen 102.

[0040] In the first fixing step, a tensioning machine can be used to apply a predetermined tension to the twill fabric (the raw material of the support screen 103). Specifically, the four sides of the twill fabric are clamped by the clamps of the tensioning machine, and these clamps are pulled mechanically or by using air pressure to adjust the tension and bias angle to a predetermined level, and the outer periphery of the twill fabric (the portion corresponding to the outer periphery 103a of the support screen 103) is fixed to the frame 101. The bias angle refers to the acute angle between the warp threads 3a or weft threads 3b and the frame 2.

[0041] In the first fixing step, an adhesive can be used to fix the outer periphery of the twill fabric to the frame 101, and in the second fixing step, to fix the outer periphery 102a of the printing screen 102 to the twill fabric. Examples of adhesives include rubber-based, epoxy-based, urethane-based, and cyanoacrylate-based adhesives, but there are no particular limitations in this embodiment, and the adhesive can be selected taking into consideration the fiber material used in the screens 102 and 103, the material of the frame 101, the components of the solvent contained in the ink used, and the like.

[0042] In the second fixing step, the position where the printing screen 102 is overlapped with the twill fabric is not particularly limited as long as it overlaps with the twill fabric, but from the viewpoint of further improving printing accuracy, it is preferable to place it in the central part of the twill fabric stretched over the printing frame 101.

[0043] In the removal step, a cutter or a laser can be used, for example, to remove a portion of the twill fabric overlapping the printing screen 102. In the removal step, a portion of the twill fabric overlapping the printing screen 102 is removed, but as long as the twill fabric does not overlap the area of ​​the printing screen 102 where ink will be filled, it is not necessary to remove the twill fabric from all areas that overlap the printing screen 102. Note that by removing a portion of the twill fabric in the removal step, the twill fabric becomes the support screen 103.

[0044] The screen printing plate 100 of this embodiment can be manufactured by the manufacturing method described above. In this manufacturing method, a portion of the twill fabric is removed, which may reduce its tension, but if the twill fabric is stretched over the screen frame 101 with high tension in advance, it is possible to prevent a decrease in printing accuracy due to a decrease in tension.

[0045] The method for manufacturing the screen printing plate 100 of this embodiment is not limited to the above-described method. For example, a method may be used in which, before tensioning the screens 102 and 103 on the printing frame 101, a support screen 103 is obtained in advance, in which the outer peripheral portion 102a of the printing screen 102 is fixed to the inner peripheral portion 103b, and the outer peripheral portion 103a is fixed to the printing frame 101 while a predetermined tension is applied to the support screen 103.

[0046] The screen printing plate 100 of this embodiment uses an n / m (n and m are independently integers of 2 or greater) twill fabric as the support screen 103, and as such, the Young's modulus of the support screen 103 can be made larger than that of a screen printing plate using a plain weave fabric or a 2 / 1 twill fabric as the support screen 103. This makes it possible to provide a screen printing plate 100 with excellent printing accuracy.

[0047] In the embodiment described above, a combination screen plate (screen plate 100) using a woven fabric as the printing screen 102 was described, but the screen plate 100 of this embodiment may also be a metal mask plate using a metal plate as the printing screen 102.

[0048] Fig. 3 shows an example of a metal mask plate (screen plate 300) using a metal plate as the printing screen 102. In the screen plate 300 shown in Fig. 3, the same components as those in the screen plate 100 shown in Fig. 1 are denoted by the same reference numerals and will not be described.

[0049] 3, in the screen plate 300, a metal plate is used as the printing screen 302. Similar to the printing screen 102 of the screen plate 100, the printing screen 302 has an outer periphery 302a fixed to the inner periphery 103b of the support screen 103.

[0050] The metal plate constituting the printing screen 302 is not particularly limited in terms of its material, but metals such as stainless steel, phosphor bronze, nickel, copper, aluminum, etc. can be used. The thickness of the metal plate constituting the printing screen 302 can be appropriately set depending on the film thickness of the printing pattern to be formed, and is not particularly limited, but can be, for example, 20 μm to 1000 μm.

[0051] Openings 302b having a shape corresponding to the print pattern to be formed are formed in the metal plate that constitutes the printing screen 302. When performing screen printing, the openings 302b are filled with ink.

[0052] The method for obtaining the metal plate having the opening 302b formed therein is not particularly limited, and any conventionally known method can be used, such as a method for forming the opening in the metal plate by etching or laser processing, or a method for obtaining the metal plate having the opening 302b formed therein by electroforming.

[0053] Screen printing using the screen 300 is performed by filling the openings 302b of the printing screen 302 (metal plate) with ink and transferring the ink held in the openings 302b to the printing surface P. The method of transferring the ink to the printing surface P is the same as when using the screen 100, so a detailed explanation will be omitted. In screen printing using the screen 300, the openings 302b in a shape corresponding to the printing pattern are formed in advance in the printing screen 302, so unlike the screen 100, the formation of the openings 200a in the photosensitive resin 200 can be omitted.

[0054] The method for manufacturing the screen plate 300 is the same as the method for manufacturing the screen plate 100 except that a metal plate having openings 302a formed therein is used as the printing screen 302, and therefore a detailed description thereof will be omitted.

[0055] Like the screen stencil 100, the screen stencil 300 described above uses an n / m (n and m are independently integers of 2 or greater) twill fabric as the fabric constituting the support screen 103. Therefore, according to the screen stencil 300 of this embodiment, the Young's modulus of the support screen 103 is greater than that of a screen stencil using a plain weave fabric or a 2 / 1 twill fabric as the support screen 103. As a result, it is possible to provide a screen stencil 300 with excellent printing accuracy. [Example]

[0056] Next, the present invention will be described in more detail with reference to examples, although the present invention is not limited to these examples.

[0057] Example 1 An aluminum frame (external dimensions: 320 mm x 320 mm, internal dimensions: 270 mm x 270 mm, thickness: 15 mm, wall thickness: 2 mm, hollow structure) was prepared as the printing frame. A tungsten screen (W40 430-13, manufactured by NBC Metal Mesh Co., Ltd.) was prepared as the raw material for the printing screen, in which tungsten metal fibers with a fiber diameter of 13 μm were woven into a 430 mesh. A 2 / 2 twill polyester screen (EX225HD2 / 2, manufactured by NBC Meshtec Co., Ltd., trade name: EX Screen) was prepared as the raw material for the support screen, in which polyester fibers with a fiber diameter of 55 μm were woven into a 225 mesh. The tungsten screen used as the raw material for the printing screen had a Young's modulus of 13110 N / mm, as measured by the slope of the SS curve at 100 N and 200 N during a tensile test. 2 The polyester screen, which is the raw material for the support screen, has a Young's modulus of 925 N / mm 2 It was.

[0058] An adhesive was applied to the outer periphery of a prepared polyester screen (support screen), and the outer periphery of the polyester screen was fixed to a printing frame while a predetermined tension was applied to the polyester screen. After applying adhesive to the outer periphery of a prepared tungsten screen (printing screen), the tungsten screen was placed over the center of the polyester screen stretched over the frame, and the outer periphery of the tungsten screen to which the adhesive had been applied was fixed to the polyester screen. The area of ​​the polyester screen (220 mm x 220 mm) that overlapped the tungsten screen was removed, and the screen stencil of Example 1 was obtained. The polyester screen and tungsten screen were fixed so that the warp (or weft) was at an angle of 23° to the frame.

[0059] In the screen printing plate of this example, a 10 μm-thick glass substrate was fixed to a predetermined area of ​​the printing screen (tungsten screen), and a silver emulsion containing photosensitive silver halide was applied to its surface. Next, a predetermined area of ​​the applied silver emulsion was exposed to light (or laser-drawn) to form a cured film of the silver emulsion, and the area where the cured film was not formed was etched with a chemical to form openings in the glass substrate. As shown in FIG. 4, the glass substrate fixed to the printing screen had five cross-shaped openings in the vertical and horizontal directions (25 in total) spaced 30 mm apart in a plan view (when viewed in the thickness direction). The line width of the cross-shaped openings was 130 μm.

[0060] The printing screen was placed facing the surface to be printed, and the printing accuracy was evaluated as described below. The tension at the center of the printing screen was 30 N / cm, as measured using a tension gauge STG-80A (manufactured by Protec Engineering), and the distance (clearance) between the printing screen and the surface to be printed was 1.1 mm.

[0061] (Comparative Example 1) A screen plate for Comparative Example 1 was prepared in the same manner as in Example 1, except that EX225HD2 / 1 (manufactured by NBC Meshtec Co., Ltd.), a 2 / 1 twill weave in which polyester fibers with a fiber diameter of 55 μm were woven into a 225 mesh, was used as the support screen, and openings were formed in predetermined areas of a glass substrate fixed to the printing screen. Here, the tension at the center of the printing screen was 30 N / cm as measured using a tension gauge STG-80A (manufactured by Protec Engineering Co., Ltd.), and the distance (clearance) between the printing screen and the surface to be printed was 1.1 mm. Furthermore, EX225HD2 / 1, the raw material for the support screen, had a Young's modulus of 845 N / mm, as measured by the slope of the SS curve at 100 N and 200 N when subjected to a tensile test. 2 It was.

[0062] (printing accuracy) Screen printing was performed 3,000 times using the screen printing plates of Example 1 and Comparative Example 1. The screen printing was performed by filling ink into openings formed in a glass substrate and holding it on a printing screen, and then moving a squeegee while pressing it against the printing screen, thereby transferring the ink held on the printing screen to the printing surface. The printing accuracy was evaluated using the print patterns on the substrate printed 10 times and 3,000 times using the evaluation method described below.

[0063] <Evaluation method> For each opening formed in the glass substrate, the intersection of the crosshairs was used as the reference point. Each reference point was assigned a number, and coordinates (hereinafter referred to as "reference coordinates") were set according to the distance between the reference points. Specifically, reference point 1 was set as coordinates (0,0), and coordinates according to the distance from reference point 1 were set as reference points 1 to 25. The coordinates in this evaluation were two-dimensional Cartesian coordinates in the horizontal direction (X) and vertical direction (Y), and a length measuring machine SQ-9000 (manufactured by Shashin Kagaku Co., Ltd.) was used to set the coordinates.

[0064] For the 10th and 3000th prints, the intersections of the crosshairs formed as the print pattern were used as evaluation points, and each evaluation point was assigned the same number as the corresponding reference point. The coordinates of evaluation point 11 were set to the coordinates (60,0) of the corresponding reference point 11, and coordinates according to the distance from evaluation point 11 were set to evaluation points 1 to 10 and 12 to 25 (hereinafter, the coordinates of evaluation points 1 to 25 will be referred to as "evaluation coordinates").

[0065] The evaluation coordinates were compared with the reference coordinates, and the positional deviation (deviation width) of the print pattern at each of points 1 to 25 was calculated from the difference in coordinates at each point.

[0066] The evaluation results for the 10th print are shown in FIG. 5, and the evaluation results for the 3000th print are shown in FIG. 6. In FIGS. 5 and 6, the vertical axis represents the amount of misalignment, and the horizontal axis represents the number of each point. In FIGS. 5 and 6, X represents the amount of misalignment in the horizontal direction (hereinafter referred to as "misalignment amount X"), and Y represents the amount of misalignment in the vertical direction (hereinafter referred to as "misalignment amount Y"). In FIGS. 5 and 6, a positive amount of misalignment indicates that the value of the evaluation coordinate has increased relative to the value of the reference coordinate, and a negative amount of misalignment indicates that the value of the evaluation coordinate has decreased relative to the value of the reference coordinate.

[0067] The average values ​​of the misalignment for the 10th and 3000th prints are shown in Table 1. The average values ​​of the misalignment were calculated using the misalignment amounts X and Y shown in Figs. 5 and 6 according to the following formula (1). JPEG2026026291000002.jpg12170 (In the above formula (1), A represents the average value of the deviation amount, xn represents the deviation amount X at point n, and yn represents the deviation amount Y at point n.)

[0068] [Table 1]

[0069] As can be seen from Table 1, the screen stencil of Example 1 was less likely to cause misalignment of the printed pattern after both the 10th and 3000th screen printing, compared to the screen stencil of Comparative Example 1. From these results, it was understood that the screen stencil of Example 1 had excellent printing accuracy.

Claims

1. A screen printing screen plate comprising a frame, a support screen having an outer periphery fixed to the frame, and a printing screen having an outer periphery fixed to the support screen, the support screen is made of an n / m twill fabric, The n and the m are each independently an integer of 2 or more, the support screen is a woven fabric made of synthetic fibers, the printing screen is made of a metal plate, the screen plate is a metal mask plate, A screen printing plate characterized in that the area of ​​the printing screen that is filled with ink during screen printing does not overlap the support screen.

2. 2. The screen plate according to claim 1, wherein n and m are each independently an integer of 5 or less.

3. 3. The screen plate according to claim 1, wherein the n and the m are the same integer.

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