JP2017074757A - Screen mask, screen printing device, and printed matter manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen mask, a screen printing device, and a printed matter manufacturing method, which are capable of achieving highly precise printing with simple structures.SOLUTION: A screen mask of one mode includes: a mesh part that has a main mesh in which size in a first direction is formed larger than size in a second direction that is orthogonal to the first direction and a support mesh that is formed to have a higher elongation rate than the main mesh and is provided in an outer periphery of the main mesh; and a mask film that is provided on the mesh part and has a pattern provided on the main mesh.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a screen mask, a screen printing apparatus, and a printed material manufacturing method.

  The screen printing method, which is one of the printing methods, is a method for forming an arbitrary printed material on a printing material using a screen mask in which a predetermined opening pattern formed of a resin composition is formed on a mesh. This screen printing method is used for various printing such as wiring, electrodes, and fluorescent material printing, and is used in various fields including electronic components.

  In recent years, high precision of screen masks has been demanded due to miniaturization and high quality of electronic components.

  In such a screen mask, a technique using a so-called combination type mesh in which a main mesh holding a mask film on which a pattern is formed and a support mesh arranged on the outer periphery of the main mesh is fixed with an adhesive is known. ing. Usually, the main mesh of the screen mask is designed to have a similar shape to the frame. For example, in many cases, the shape of the frame, the outer shape of the support mesh, and the outer shape of the main mesh are a square shape in which the dimensions in the moving direction of the squeegee at the time of printing are the same as the dimensions in the width direction perpendicular to the moving direction. It has become.

JP 2013-169783 A

  However, when the screen is printed, the mesh portion is stretched as the squeegee is pressed and moved, so that the pattern stretches and spreads or distorts like a bow, so that there is a problem that the printing shape becomes non-uniform and the printing accuracy decreases.

  A screen mask according to an aspect of the present invention includes a main mesh having a dimension in a first direction larger than a dimension in a second direction orthogonal to the first direction, and a higher elongation than the main mesh. A mesh portion including a support mesh provided on an outer periphery of the main mesh, and a mask film provided on the mesh portion and having a pattern disposed on the main mesh.

  According to the embodiments of the present invention, it is possible to provide a screen mask, a screen printing apparatus, and a printed matter manufacturing method capable of printing with high accuracy with a simple configuration.

The top view which shows the structure of the screen printing apparatus concerning 1st Embodiment. The side view of the screen printing apparatus. The side view of the screen printing apparatus. Explanatory drawing which shows the dimension setting of the main mesh of a screen mask, and the maximum amount of elongation in a 1st direction. Explanatory drawing which shows the dimension setting of the main mesh of a screen mask, and the minimum elongation amount in a 1st direction. Explanatory drawing which shows the amount of elongation in the 2nd direction and the main mesh dimension setting of a screen mask. Explanatory drawing of the dimension setting of the screen mask which concerns on the same embodiment. Explanatory drawing which shows the relationship between the size of the 1st direction of the main mesh of the screen mask which concerns on the embodiment, and a 2nd direction. Explanatory drawing which shows the ratio of the size of the 1st direction of the main mesh of the screen mask which concerns on the embodiment, and a 2nd direction. Explanatory drawing which shows the printing shape by the screen mask concerning the embodiment and a comparative example. Explanatory drawing which shows the structure of the screen mask concerning 2nd thru | or 4th embodiment and a comparative example. Explanatory drawing which shows the printing shape by the screen mask concerning 2nd thru | or 4th embodiment and a comparative example. Explanatory drawing which shows the elastic strength ratio and the printing result in the screen mask concerning 2nd thru | or 5th Embodiment. Explanatory drawing which shows the relationship between the elastic strength ratio in the screen mask concerning 2nd thru | or 5th Embodiment, and the elongation amount at the time of printing. Explanatory drawing which shows the relationship between the elastic strength ratio in the screen mask concerning 2nd thru | or 5th Embodiment, and the distortion amount at the time of printing. Explanatory drawing which shows the relationship between the size of the 1st direction of the main mesh of the screen mask which concerns on other embodiment, and a 2nd direction. Explanatory drawing which shows the ratio of the size of the 1st direction of the main mesh of the screen mask which concerns on the embodiment, and a 2nd direction. Explanatory drawing which shows the relationship between the size of the 1st direction of the main mesh of the screen mask which concerns on other embodiment, and a 2nd direction. Explanatory drawing which shows the ratio of the size of the 1st direction of the main mesh of the screen mask which concerns on the embodiment, and a 2nd direction.

  Hereinafter, a screen printing apparatus 10 and a screen mask 20 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a plan view of the screen printing apparatus 10 according to the present embodiment as viewed from the Z direction, FIG. 2 is a side view as viewed from the X direction, and FIG. 3 is a side view as viewed from the Y direction. In each figure, for the sake of explanation, the configuration is appropriately enlarged, reduced, and omitted. In the figure, arrows X, Y, and Z indicate three directions orthogonal to each other, the first direction is the Y direction, and the second direction is the X direction.

  As shown in FIG. 1, the screen printing apparatus 10 includes a screen mask 20, a holding member 12 that holds a printing medium 30 facing one surface (front surface) that is the printing surface side of the screen mask 20, and a screen mask. The squeegee 13 is configured to be movable while being in contact with the other surface (back surface) opposite to the printing surface side, the moving means for moving the squeegee 13, and the screen mask 20 facing the printing medium 30. And supporting means for supporting.

  The screen printing apparatus 10 forms various printing materials in a predetermined pattern on the surface of the printing medium 30. The screen printing apparatus 10 includes, for example, chip components (capacitors, chip resistors, inductors, thermistors, etc.), touch panels, liquid crystal substrates (LCD) seals, LTCC (Low Temperature Co-fired ceramics) substrates, and solar cells. Used for manufacturing electrodes and other electronic components.

  As shown in FIGS. 1 to 3, the screen mask 20 includes a frame 21, a mesh portion 22 stretched on the frame 21, and a mask film 23 formed on the mesh portion 22. In the screen mask 20, the side facing the surface of the print medium 30 when performing printing is the front side, and the opposite side, the side to which the coating material 32 is supplied, is the back side.

  The frame 21 has two pairs of sides parallel to each other, and is configured in a frame shape having a square opening of a desired size, for example. The frame 21 supports the outer peripheral edge of the mesh portion 22 and stretches the mesh portion 22 in the opening. In this embodiment, as an example, the Y-direction dimension Fy of the opening of the frame 21 is 275 mm, and the X-direction dimension Fx is 275 mm.

  The frame 21 also functions as a frame that holds a predetermined amount of the coating material 32 on the back side of the mask film 23. The frame 21 and the mesh part 22 are joined at the joining part 22a by, for example, a synthetic rubber-based or cyanoacrylate-based adhesive.

  The mesh portion 22 is a so-called combination type in which an inner main mesh 26 and an outer support mesh 27 having different elongation rates are fixedly connected with a UV curable adhesive. The mesh portion 22 holds the mask film 23 in the opening portion of the frame 21.

  The main mesh 26 is a woven fabric formed by knitting warps 26a and wefts 26b, and has a large number of holes 26c that are open to allow the coating material 32 to pass therethrough. The warps 26a and the wefts 26b are fibers made of a metal wire such as stainless steel or a resin such as polyester. The warps 26a and the wefts 26b extend obliquely with respect to the moving direction of the squeegee 13 along the arrow A, for example.

  The main mesh 26 is configured in a rectangular shape whose dimension in the Y direction is larger than that in the X direction. In the present embodiment, as an example, the dimension My in the Y direction is 230 mm, and the dimension Mx in the X direction is 200 mm.

  The support mesh 27 is joined to the outer periphery of the main mesh 26 with an adhesive 24. The support mesh 27 is a woven fabric formed by knitting warps 27a and wefts 27b. The support mesh 27 is configured to have a higher elongation rate than the main mesh 26.

  For example, in this embodiment, the tensile elastic modulus (Young's modulus) of the support mesh 27 is set to be 20% or less of the tensile elastic modulus of the main mesh 26. Further, an elastic strength ratio, which is a ratio of the tensile elastic strength of the support mesh 27 and the tensile elastic strength of the main mesh 26, is set within a range of 10% to 25%.

Here, the tensile elastic modulus is the ratio of the tensile stress of the meshes 26 and 27 to the elongation of the length per unit, and is expressed by the following equation. The tensile elastic modulus changes depending on various conditions such as material properties, weaving, density, and wire diameter of the mesh. The tensile elastic modulus is measured using a general Young's modulus measuring device. As an example, Shimadzu Autograph AGS-100A manufactured by Shimadzu Corporation is used.
Tensile elastic modulus [N / mm2] = dp / dl × L / A
Here, dp = the amount of change in load, dl = the amount of change in elongation, L = the gauge distance to be measured, and A = the total sectional area of the strands.

  The mesh elastic strength is a numerical value obtained by dividing the amount of change in load (dp) in the elastic deformation region when a test piece having a width of 50 mm is pulled at a gauge distance of 200 mm by the amount of change in elongation (dl). Mesh elastic strength [N / mm] = dp / dl.

  The elastic strength ratio is a numerical value obtained by dividing the mesh elastic strength of the support mesh 27 by the mesh elastic strength of the main mesh 26.

  In this embodiment, the tensile elastic modulus of the support mesh 27 is set to 20% or less of the tensile elastic modulus of the main mesh 26, and the elastic strength ratio is set within a range of 10% to 25%. That is, when the tensile elastic strength ratio is less than 10%, the tension of the mask film 23 cannot be maintained, the printing position cannot be controlled, and the shape collapses. On the other hand, when the tensile elastic strength ratio is 25% or more, the main mesh 26 is excessively stretched and the printed shape is destroyed. Therefore, in this embodiment, the tensile elastic strength of the support mesh 27 is 10% of the tensile elastic strength of the main mesh 26. By setting the content to 25% or less, distortion and elongation of the printed shape are suppressed.

The outer shape of the support mesh 27 is a shape corresponding to the shape of the opening portion 21a of the frame 21, and is configured in a square shape in which the dimension in the X direction is the same as the dimension in the Y direction. In this embodiment, as an example, the width dimension Sy in the Y direction is 45 mm, and the width dimension Sx in the X direction is 75 mm.
The outer periphery of the support mesh 27 is joined to and supported by the frame 21 with an adhesive or the like.

  The warp yarns 27a and the weft yarns 27b of the support mesh 27 are fibers made of a metal wire such as stainless steel or a resin such as polyester.

  The mask film 23 is a layer made of a photocurable resin composition, for example, PVA, PVAc, silicon resin, acrylic resin, epoxy resin or the like. The mask film 23 is formed on the mesh portion 22 and is disposed in the opening portion of the frame 21. A predetermined opening pattern 23 a for printing is formed on the mask film 23 by exposure using the photomask 25. The opening pattern 23a is formed in the main mesh 26 portion.

  The mask film 23 forms a printing part in which the photosensitive resin does not exist in the opening pattern 23a, and the coating material 32 can pass from the back surface to the front surface through the holes of the mesh part 22. A portion other than the opening pattern 23a of the mask film 23 and where the hole portion of the mesh portion 22 is blocked with a photosensitive resin constitutes a non-printing portion that does not transmit ink as the coating material 32.

  The mesh portion 22 on which the mask film 23 is formed is configured to be elastically deformable so as to be bent and deformed by the pressing force of the squeegee 13, for example, and restored when the pressing force is released. In a state where the coating material 32 is held in the opening pattern 23a of the mask film 23, the coating film 32 is brought into contact with and separated from the printing medium 30 by elastic deformation of the mesh portion 22, so that the coating material 32 is moved from the opening pattern 23a to the printing medium 30. Is transcribed.

  The squeegee 13 is made of a material such as urethane rubber, silicon rubber, synthetic rubber, metal or plastic, for example, in a thin plate shape. For example, the squeegee 13 is chamfered so that the thickness of the tip is reduced. The squeegee 13 is configured to be able to reciprocate with respect to the frame 21. For example, the squeegee 13 has a length extending over the entire length of the mask film 23 in a direction orthogonal to the moving direction. The tip portion 13a of the squeegee 13 is in contact with the back surface of the screen mask 20 and is pressed to the front side, so that the squeegee 13 moves in the moving direction along the Y direction, thereby pressing the entire surface of the mask film 23, and the coating material 32 is previously applied. The coating material 32 is extruded to the front side from the filled opening pattern 23a.

  The support means supports the frame 21 in parallel with the print medium 30 with a predetermined gap G1. The moving means moves the squeegee 13 along the first direction at a predetermined speed.

  Next, a printed material manufacturing method for manufacturing the printed material 31 by the screen printing method using the screen printing apparatus 10 according to the present embodiment will be described. First, the surface side of the screen mask 20 is arranged to face the surface of the print medium 30 held by the holding member 12.

  Then, a high-viscosity paste-like coating material 32 is supplied from the back side of the screen mask 20, that is, the surface opposite to the printing medium 30, and the coating material 32 is filled into the opening pattern 23a.

  Next, the squeegee 13 is disposed on the back surface of the screen mask 20, that is, the surface opposite to the printing surface side. At this time, for example, the squeegee 13 is arranged at a predetermined angle θ with respect to the surface on the front side of the print medium 30. The squeegee 13 is moved at a predetermined speed v along the Y direction while pressing the squeegee 13 on the back surface of the mesh portion 22 and the mask film 23 toward the print medium 30 with a predetermined printing pressure.

  For example, the squeegee 13 presses the mask film 23 in an area covering the entire back surface of the mask film 23. By the pressing of the squeegee 13, the mask film 23 is deformed so that the pressed portion is displaced to the front side, and comes into contact with the printing medium 30. The coating material 32 that has passed through the squeegee 13 is pushed out from the opening pattern 23a to the print medium 30 side.

  After the squeegee 13 passes, the mask film 23 and the mesh portion 22 are deformed so as to be restored and separated from the print medium 30, and a part of the coating material 32 is transferred onto the print medium 30 and remains. Pattern printing is performed on 30, and printed matter 31 is completed. The coating material 32 is a variety of materials including, for example, a metal material or a resin material, and various materials are used depending on the type of print target, for example, an electronic component, a display, or the like.

  Here, the configuration of the mesh portion 22 and the amount of elongation will be described with reference to FIGS.

  During printing, the squeegee 13 that is long in the X direction is moved in the Y direction by a predetermined amount while being pressed in the Z direction. By this movement and pressing, the mesh portion 22 is deformed and stretched.

  Here, the screen mask 20 according to the present embodiment and a combination-type screen mask 100 having a similar shape as a comparative example will be described in comparison.

  As shown in FIG. 10, the screen mask 100 is a so-called combination type, and is a mesh in which a main frame 112 and a support mesh 113 provided on the outer periphery of the main mesh 112 are joined to a square frame 111. Part 114 is provided. The main mesh 112 has an external shape similar to that of the frame 111, and is configured in a square shape, for example. The support mesh 113 has an outer shape similar to that of the frame 111, for example, a square outer shape, and is configured to surround the main mesh 112. The support mesh 113 is configured to have a higher elongation rate than the main mesh 112. A mask film 115 is formed on the mesh portion 114. An opening pattern 115 a is formed at a predetermined portion of the mask film 115 in the main mesh 112. The mesh part 114 extends while being elastically deformed by pressing the squeegee 13 during printing.

  As shown in FIG. 2, the amount of elongation in the Y direction of the mesh portion 22 varies depending on the position of the squeegee 13. Specifically, when the squeegee 13 is positioned at the end of the movement range that is the start point and end point of the movement, the amount of elongation in the Y direction is the largest. Further, when the squeegee 13 is located at the center of the movement range, the amount of elongation in the Y direction is the smallest.

  The amount of elongation in the Y direction of the mesh portions 22 and 114 varies depending on the position of the squeegee 13. The amount of elongation is minimized when the squeegee 13 is in the center of the movement range, and is expressed by the following formula 1.

  The amount of elongation is minimized when the squeegee 13 is in the center of the movement range, and is expressed by the following formula 2.

  On the other hand, the amount of elongation in the X direction of the mesh portions 22 and 114 is constant, and is expressed by the following Equation 3.

  Here, in the screen masks 20 and 100, the elongation amount of the mesh portions 22 and 114 is the sum of the elongation amounts of the main meshes 26 and 111 and the elongation amounts of the support meshes 27 and 112.

  For example, when the shape of the main mesh 112 is similar to the shape of the mesh portion 22 as in the screen mask 100 according to the comparative example, when the amount of elongation in the X direction is larger than the amount of elongation in the Y direction of the mesh portion 22, In proportion to this, the extension amount in the X direction of the main mesh 26 is also larger than the extension amount in the Y direction. In addition, when the amount of elongation in the Y direction is larger than the amount of elongation in the X direction of the mesh portion 22, the amount of elongation in the Y direction is larger than the amount of elongation of the main mesh 26 in the X direction.

  Therefore, when the shape of the main mesh 112 is similar to the shape of the mesh portion 22 as in the screen mask 100, the pattern 112a is stretched or distorted depending on how the main mesh 112 is stretched.

  FIG. 4 is an explanatory diagram showing the size of the main mesh of the screen mask and the maximum elongation in the first direction. FIG. 5 is an explanatory diagram showing the size of the main mesh of the screen mask and the minimum amount of elongation in the first direction. FIG. 6 is an explanatory diagram showing the dimensions of the main mesh of the screen mask and the amount of elongation in the second direction.

  As shown in FIGS. 4 to 6, in both the X direction and the Y direction, the extension amount of the main mesh decreases as the size of the main mesh increases.

  Therefore, in the combination mask, even if the amount of elongation of the mesh portion 22 is constant, if the amount of the support mesh 27 having a large elongation rate is increased, the amount of elongation of the main mesh 26 is reduced, and the amount of the support mesh 27 is reduced. Decreasing it will increase the amount of elongation of the main mesh.

  For this reason, if the amount of the main mesh 26 in the mesh portion 22 in the Y direction is increased, for example, the extension amount of the main mesh 26 can be decreased only in the Y direction. On the contrary, if the amount of the main mesh 26 in the X direction is increased, the extension amount of the main mesh 26 can be decreased only in the X direction.

  That is, even if the elongation of the mesh portion 22 varies depending on the direction, it is considered that the difference in the amount of elongation of the main mesh 26 can be suppressed by adjusting the amount of the main mesh 26 and the support mesh 27. .

  Further, when the pattern 23a of the mask film 23 is formed on the main mesh 26 having a small elongation rate, it is considered that the elongation of the main mesh 26 mainly affects the printing shape and printing accuracy.

  Considering the above, the screen mask 20 according to the present embodiment was designed under the following conditions so as to reduce the difference in the amount of extension of the main mesh 26 in the X direction and the Y direction.

  As an example, in the screen mask 20, the dimension of the main mesh 26 in the Y direction is set larger than the dimension of X. On the other hand, the outer shape of the mesh portion 22, that is, the outer shape of the support mesh 27 is a shape corresponding to the opening portion of the frame 21, and is configured in a square shape here.

  Further, the screen mask 20 is set so that the size ratio of the main mesh to the size of the mesh portion is larger than the size ratio in the X direction where the elongation amount is small in the Y direction where the elongation amount is larger. That is, the amount of the main mesh 26 in the mesh portion 22 is larger in the Y direction than in the X direction. For example, in the X direction, the size ratio of the main mesh 26 to the size of the mesh portion 22 is set to be 40% or more and 90% or less of the size ratio in the Y direction.

  In the screen mask 20 in the present embodiment, the dimensions of the main mesh 26 and the support mesh 27 are set so that the ratio between the amount of elongation in the Y direction and the amount of elongation in the X direction during printing is close.

  Specifically, the extension amount A1 of the main mesh 26 in the X direction is set to a value within the change range of the extension amount of the main mesh 26 in the Y direction. That is, as shown in FIG. 7, the extension amount A1 in the X direction is located between the maximum extension amount A2 and the minimum extension amount A3 in the Y direction, and is set so as to satisfy the formula A2 ≦ A1 ≦ A3. Here, A1 is the amount of elongation of the main mesh 26 in the X direction, and is obtained by the following equation 4.

  The minimum elongation amount A2 in the Y direction of the main mesh 26 is obtained by the following formula 5. A2 is, for example, the amount of elongation when the squeegee 13 is arranged at the end of the movement range.

  The maximum elongation A3 in the Y direction of the main mesh 26 is obtained by the following formula (6). A3 is, for example, the amount of elongation when the squeegee 13 is arranged at the center of the movement range.

  Here, as shown in FIG. 1, the dimensions of the opening of the frame 21 in the X and Y directions are Fx and Fy, respectively, and the outer dimensions of the main mesh 26 in the X and Y directions are Mx and My, respectively. The outer dimensions of the support mesh 27 in the X and Y directions are Sx and Sy.

  Further, the support meshes of the mesh unit 22 are Cx = Sx / Mx and Cy = Sy / My, respectively. The elongation rate of the wire material of the main mesh 26 is Em, the elongation rate of the wire material of the support mesh 27 is Es, and the elongation rate ratio E = Es / Em of the wire material of the mesh portion 22. The elongation ratio of the mesh part 22 is Ex = Cx * E and Ey = Cy * E. The gap size during printing is G, the squeegee width is W, and the printing stroke is P.

  FIG. 8 is an explanatory diagram showing the relationship between the sizes of the main mesh 26 of the screen mask 20 in the first direction and the second direction. In FIG. 8, the curves indicated by the solid lines indicate the lower limit and the upper limit of the preferred range of the dimensions of the main mesh 26, respectively. In FIG. 8, the case where the main mesh 26 is square is shown by a broken line as a comparative example. FIG. 9 is an explanatory diagram showing dimensional ratios of the main mesh 26 of the screen mask 20 in the first direction and the second direction. A curve indicated by a solid line in FIG. 9 indicates an upper limit and a lower limit of a preferable range of the dimensional ratio. In FIG. 9, as a comparative example, a dimensional ratio when the main mesh 112 is a square, that is, a similar shape to the frame 111 is indicated by a broken line.

  That is, it is preferable to set the size ratio of the main mesh 26 in the XY direction or the amount ratio of the main mesh 26 in the XY direction so as to be within the range between the solid lines in FIGS. In the present embodiment, as an example, the dimension in the Y direction is 230 mm, whereas the dimension in the X direction is 200 mm.

  According to the screen mask 20, the screen printing apparatus 10, and the screen printing method configured as described above, high-precision printing can be performed with a simple configuration.

  That is, in the screen mask 20, the amount of elongation can be controlled by adjusting the amount of the main mesh 26. Therefore, by increasing the size or amount of the main mesh 26 in the printing direction that is more easily stretched during printing, the elongation and distortion of the pattern 23a can be suppressed. For this reason, the influence which the elongation of the mesh part 22 exerts on the printing shape can be suppressed, and the distortion and deformation of the printing shape due to the deformation and elongation of the mesh part 22 are suppressed. As a result, the printed fine line pattern shape is uniform.

  In addition, according to the screen mask 20, a more uniform pattern shape can be realized by setting the X-direction extension amount within the change range of the Y-direction extension amount that varies depending on the position.

  FIG. 10 is an explanatory diagram showing the printed shapes of a printed matter 31 printed using the screen mask 20 in this embodiment and a printed matter 131 printed using the screen mask 100 as a comparative example. In FIG. 10, for the sake of explanation, positions corresponding to the columns of the opening patterns 23a are indicated by broken lines. That is, the broken line intersection is a position corresponding to the opening pattern 23a, and the deviation between the position of the intersection and the position of the coating material 32 is the position deviation of the pattern printing.

  As can be seen from FIG. 9, in the screen mask 20 according to the present embodiment, the displacement of the patterned coating material 32 is small and the distortion is reduced.

  Further, according to the present embodiment, since the amount of elongation in each direction can be controlled simply by adjusting the shape of the main mesh 26 in the combination type mesh structure, the versatility is high. Therefore, for example, an existing frame can be used.

  Furthermore, according to the screen mask 20 according to the present embodiment, the support mesh 27 is appropriately stretched because the tensile elastic modulus of the support mesh 27 is 40% or more and 70% or less of the tensile elastic modulus of the main mesh 26, and the main mesh is expanded. Since the stress applied to the sheet is relieved, printing distortion can be suppressed.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage.

  For example, in the above embodiment, the shape of the frame 21 is 320 mm × 320 mm, and the square frame 21 and the support mesh 27 are used. However, the shape is not limited to this, and the rectangular frame 21 and the support mesh 27 may be used. . Also in this case, by adjusting the amount and shape of the main mesh 26 as a dimensional ratio different from the similar shape of the support mesh 27, the amount of the main mesh 26 can be varied depending on the direction, and the amount of extension of the main mesh 26 can be controlled. . Therefore, printing distortion can be achieved by suppressing the difference in the amount of elongation of the main mesh depending on the direction.

FIGS. 11 and 12 are explanatory diagrams comparing the characteristics of the screen mask 20A according to the second embodiment, the screen mask 20B according to the third embodiment, and the screen mask 20C according to the fourth embodiment. In these screen masks 20A, 20B, and 20C, the shape of the frame 21 was set to 550 mm × 650 mm. FIG. 11 is an explanatory diagram illustrating the configuration of the screen masks according to the second to fourth embodiments and the comparative example, and FIG. 12 compares the print shapes of the screen masks according to the second to fourth embodiments and the comparative example. It is explanatory drawing shown.
11 and 12, a screen mask 110A in which the main mesh 26 is configured to be similar to the frame 21 is shown as a comparative example.

  In the screen mask 20A according to the second embodiment, the frame 21 and the support mesh 27 are formed in a rectangular shape. In the present embodiment, the dimensional ratio between the main mesh 26 and the support mesh 27 is configured within the range of A2 ≦ A1 ≦ A3 as in the first embodiment. Specifically, the shape of the support mesh 27 is 170 mm × 120 mm, and the shape of the main mesh 26 is 300 × 450 mm. The tensile elastic modulus is 50%. The rest is the same as the screen mask 20 according to the first embodiment.

  In the screen mask 20B according to the third embodiment, the frame 21 and the support mesh 27 are configured in the same rectangle as that in the second embodiment. In the present embodiment, the dimensional ratio between the main mesh 26 and the support mesh 27 is configured within the range of A2 ≦ A1 ≦ A3 as in the first embodiment.

  Specifically, the shape of the support mesh 27 is 170 mm × 120 mm, and the shape of the main mesh 26 is 300 × 450 mm.

  In the screen mask 20C according to the fourth embodiment, the frame 21 and the support mesh 27 are formed in the same rectangle as that in the second embodiment. In the present embodiment, the dimensional ratio between the main mesh 26 and the support mesh 27 is configured within the range of A2 ≦ A1 ≦ A3 as in the first embodiment.

  The screen mask 110A according to Comparative Example 1 has a main mesh that is similar to the frame, and a tensile elastic modulus ratio of 58%. That is, the shape of the support mesh 27 is 70 mm × 70 mm, and the shape of the main mesh 26 is 400 × 500 mm (similar to the frame).

  FIG. 12 is a graph showing the displacement of the printing shape at the initial printing and the 1000th printing for the screen masks 20A, 20B, 20C, and 110A. FIG. 10 shows, as a comparative example, the displacement of the printed shape of the screen mask 110A in which the main mesh 26 and the support mesh 27 are similar and the tensile elastic modulus ratio is 58%. As shown in FIG. 10, the screen masks 20A, 20B, and 20C can suppress the elongation and distortion during printing smaller than the screen mask 110A according to the comparative example.

  As shown in FIGS. 11 and 12, the screen masks 20A, 20B, and 20C can achieve the same effects as those of the first embodiment. That is, even if the frame 21 and the support mesh 27 are rectangular, the dimensional ratio of the main mesh 26 to the support mesh 27 is set in the range of 40% to 90% of the dimensional ratio in the Y direction in the X direction. Compared to the comparative example 110A, it is possible to suppress the deviation and distortion of the printed shape.

  Furthermore, in the screen masks 20A and 20B, it is possible to suppress the deviation of the printed shape by setting the tensile elastic modulus ratio in the range of 40% to 70% and the elastic strength ratio in the range of 10% to 25%. Recognize.

  FIGS. 13 to 15 are explanatory diagrams showing the elastic strength ratios and printing results of the screen masks 20A, 20B, 20C, and 20D according to the second to fifth embodiments and the screen masks 110A and 110B according to the comparative example. FIG. 14 shows the relationship between the elastic strength ratio and the amount of elongation during printing, and FIG. 15 shows the relationship between the elastic strength ratio and the amount of strain during printing. FIG. 16 is an explanatory diagram showing the relationship between the size of the main mesh in the first direction and the second direction of the screen mask according to the embodiment, and FIG. 17 shows the ratio between the first direction and the second direction of the main mesh. It is explanatory drawing which shows a relationship.

  In the screen mask 20D, the elastic strength ratio was 21%. The rest is configured in the same manner as the screen mask 20A.

Further, the screen mask 110B according to the comparative example has an elastic strength ratio of 28%. The rest is configured in the same manner as the screen mask 20A. That is, the shape of the support mesh 27 is 170 mm × 120 mm, and the shape of the main mesh 26 is 300 × 450 mm.
According to FIGS. 13 to 17, the support mesh 27 is stretched by about 50% with respect to the main mesh, so that the printing width elongation and distortion are suppressed. It can be seen that it is.

  That is, by setting the elastic strength ratio, which is the ratio of the elastic modulus of the support mesh 27 and the main mesh 26, to 10% or more and 25% or less, the print width elongation can be suppressed as compared with the case where it is less than 10%. Therefore, it is possible to obtain an effect that the distortion is reduced as compared with the case where it is larger than 25%.

  Further, as shown in FIGS. 15 and 16, by setting the dimensions within a range satisfying A2 ≦ A1 ≦ A3, it is possible to suppress the deviation or distortion of the printed shape.

  In the second to fifth embodiments, the shape of the support mesh 27 is rectangular as an example. However, the shape of the support mesh 27 is not limited to this. For example, as shown in FIGS. Even if 27 is used, the same effect can be obtained. 18 and 19 are explanatory views showing dimensional ratios when, for example, a 450 mm × 450 mm frame is used and the support mesh 27 is a square as another embodiment. Even in this case, it is possible to suppress the deviation or distortion of the printing shape by setting the dimensions within a range satisfying A2 ≦ A1 ≦ A3.

  Further, in each of the above embodiments, the example in which the mask film 23 is formed over the entire area of the mesh portion 22 has been shown, but the present invention is not limited to this, and the mesh portion 22 or the main mesh 26 may be part of the central portion. Only the mask film 23 may be formed.

  In addition, each component illustrated in the above embodiment may be deleted, and the shape, structure, material, and the like of each component may be changed. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment.

DESCRIPTION OF SYMBOLS 10 ... Screen printer, 12 ... Holding member, 13 ... Squeegee, 13a ... Tip part, 20, 20A, 20B, 20C, 20D, 20E, 20F ... Screen mask, 21 ... Frame, 21a ... Opening part, 22 ... Mesh part 22a ... joining part, 23 ... mask film, 23a ... opening pattern, 24 ... adhesive, 25 ... photomask, 26 ... main mesh, 26a ... warp, 26b ... weft, 26c ... hole, 27 ... support mesh, 27a ... warp, 27b ... weft, 30 ... print medium, 31 ... printed matter, 32 ... coating material.

Claims (7)

A main mesh formed with a dimension in the first direction larger than a dimension in the second direction orthogonal to the first direction, and a support mesh configured to have a higher elongation rate than the main mesh and provided on the outer periphery of the main mesh And a mesh part comprising:
A mask film provided in the mesh portion and having a pattern disposed on the main mesh;
A screen mask comprising: A mesh portion comprising a main mesh and a support mesh having a higher elongation than the main mesh and provided on the outer periphery of the main mesh;
A mask film provided in the mesh portion and having a pattern disposed on the main mesh;
With
In the first direction, the size ratio of the main mesh to the size of the mesh portion is larger than the size ratio in the second direction orthogonal to the first direction.   3. The screen mask according to claim 2, wherein the size ratio in the second direction is not less than 40% and not more than 90% of the size ratio in the first direction.   4. The screen mask according to claim 1, wherein an elastic strength ratio, which is a ratio of a tensile elastic modulus of the support mesh and a tensile elastic modulus of the main mesh, is 10% or more and 25% or less. The first direction is a moving direction of the squeegee,
The screen mask according to claim 1, wherein an extension amount in the second direction at the time of printing the main mesh is set within a change range of the extension amount in the first direction. A screen mask according to any one of claims 1 to 5;
A frame that supports the mesh portion facing the print medium;
A squeegee configured to come into contact with a surface opposite to the printing surface side of the screen mask and be movable in the first direction;
The mesh portion is elastically deformable, and the coating material is brought into contact with and separated from the printing medium while the coating material is held in the opening pattern of the mask film. A screen printing apparatus which is transferred to a medium.   7. The screen printing apparatus according to claim 1, wherein a coating material is held on the mask film, and the coating is applied from the pattern of the mask film to a printing medium disposed to face the surface of the mask film. A method for producing a printed material, comprising applying a material.