JPH10315647A - Screen printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing plate formed without defect or disconnection of a fine pattern by incorporating high dimensional stability in the plate used for screen printing a thick film pattern. SOLUTION: In the screen printing plate comprising at least a screen frame 6 and stencil in such a manner that the stencil is made of a screen mesh and a plate film 30 for limiting a printing pattern, the mesh has two or more. And, interstices of at least the two meshes 10A, 10B are superposed at an oblique angle to be symmetrical to a printing direction, and the two meshes 10A, 10B are fixed by the film 30 or plating film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing plate used for screen printing, and more particularly to a screen printing plate for forming a pattern on an electronic industrial component requiring a fine pattern.

[0002]

2. Description of the Related Art Pattern formation by screen printing is performed by:
There are advantages in that the plate making and printing method of the pattern to be formed are simple, equipment costs and expenses are low, and a thick and fine pattern of the ink layer can be formed. For this reason, conventionally, in addition to ordinary commercial printed matter, it has been widely used in the field of the electronics industry, such as circuit formation by a resist etching method, circuit formation using conductive ink, and passive element formation.

[0003] A method of producing a screen plate used in screen printing includes a method of forming a pattern portion by using a photosensitive resin or the like on a stainless steel wire or a synthetic fiber mesh (shape) stretched over a plate frame. It is generally known that a stencil is formed by providing a non-opening portion that becomes a non-pattern portion by a plate film and a stencil by forming an opening portion by etching only a pattern portion on a thin metal plate. I have.

The characteristics required for the screen plate include printing durability, dimensional stability, organic solvent resistance, water resistance, acid resistance, alkali resistance and elasticity, and the mesh is opened so that the printing ink is easily removed. It is desirable that the porosity be large.

In the recent application of screen printing to the electronics industry, particularly in the manufacturing process of plasma display panels and plasma addressed liquid crystals, high-level printing with a fine pattern having a fine pattern is performed in printing an electrode paste or a glass paste on a large-area glass substrate. Printing accuracy is required.

Conventionally, it has been known that screen printing as a method for forming a fine pattern has a larger pattern thickness than a printing method such as gravure printing or offset printing. In order to form a print pattern having a large thickness, for example, when forming a barrier rib (partition wall) of a plasma display panel or a plasma addressed liquid crystal panel by printing, a method of performing overprinting or a method disclosed in Japanese Patent Application Laid-Open No. 7-81262 is used. There is known a method of using a screen printing plate in which two or more screen meshes are overlapped and fixed to a plate frame as proposed in Japanese Patent Application Laid-Open No. 7-276838.

Particularly, in the case of using a screen printing plate in which two or more screen meshes are overlapped and fixed to a plate frame, the tension applied to each screen mesh is greater than that of a normal screen mesh. Therefore, the number of screen meshes and the wire diameter can be reduced, and a finer pattern can be formed.

Further, in screen printing in which a fine pattern is formed as a thick film, the print pattern is a fine line, and the mesh cross portion of the screen mesh blocks the ink discharge, so that the print pattern becomes uneven, missing, broken, etc. When the screen mesh is likely to occur, especially when the stripe pattern such as the barrier ribs of the electrodes of the plasma display panel or the plasma addressed liquid crystal panel has irregularities or defects such as interference fringes of the screen mesh, the screen mesh may be shifted in the line direction of the print pattern. It is known that by inclining the eyes by 22.5 degrees, the pattern to be printed is not easily affected by the mesh cloth of the screen mesh, and a clear printed pattern having no unevenness, omission or disconnection is formed. .

[0009] The angle at which the eyes of the screen mesh are inclined is, in practice, in the range of 10 to 45 degrees, depending on the relationship between the width of the original screen mesh and the size of the plate frame and the design and layout of the printing pattern. It has been appropriately selected.

However, in screen printing, when the ink on the stencil is transferred onto the printing material, the stencil composed of the screen mesh and the plate film is stretched by a squeegee. On the other hand, when the eyes of the screen mesh have an inclination, a force is applied to the screen mesh in the direction of the warp and the weft, which compose the screen mesh, and the screen mesh tends to extend in that direction. There is a problem in that the pattern is deformed into a shape elongated in a direction inclined with respect to, and a rectangular print pattern is deformed into a parallelogram to form a pattern.

Particularly, in the process of weaving the screen mesh, if there is a difference between the warp tension and the weft tension of the screen mesh made of stainless steel wire or synthetic fiber, the elongation of the screen mesh is different between the warp direction and the weft direction. However, there has been a problem that the deformation of the printed pattern becomes remarkable.

[0012]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a screen printing plate used for screen printing of a thick film pattern with high dimensional stability. An object of the present invention is to provide a screen printing plate that has a fine pattern and can be formed without missing or breaking.

[0013]

In order to achieve the above-mentioned object, the present invention firstly comprises a plate frame and a stencil, wherein the stencil defines a screen mesh and a printing pattern. A screen printing plate comprising a film, wherein the screen mesh comprises two or more sheets, and at least two screen meshes are superposed at an inclination angle so as to be symmetric with respect to a printing direction. It is a print version.

Further, in the invention of claim 2, the at least two screen meshes are screen printing plates fixed by a plate film for limiting a printing pattern.

Further, in the invention of claim 3, the at least two screen meshes are screen printing plates fixed by a plating film.

[0016]

Embodiments of the present invention will be described below. The screen printing plate of the present invention, as shown in FIG.
In a screen printing plate (1) comprising at least a plate frame (6) and a stencil, wherein the stencil comprises a screen mesh and a plate film (30) for limiting a printing pattern, the screen mesh comprises two or more sheets. As shown in FIG. 3, at least two screen meshes (1
0A, 10B) are superimposed at an inclination angle (θ) such that the eyes are symmetrical with respect to the printing direction (Y).

Specifically, as shown in FIG. 3, the eyes of the upper screen mesh (10A) are inclined counterclockwise (θ) with respect to the printing direction (Y) and the lower screen mesh (10B). Are superimposed such that the clockwise inclination angle (θ) is the same as the printing direction (P).

As described above, in the screen printing plate of the present invention, when the screen mesh is stretched by a squeegee at the time of printing, the warp and the weft constituting the screen mesh are compared with the conventional screen printing plate. Is applied in the direction of, at least two screen meshes (10A, 10B) are superposed at an inclination angle (θ) that is symmetrical with respect to the printing direction (Y). Mesh (1
0A, 10B) tends to extend in a direction symmetrical with respect to the printing direction (Y), thereby canceling out the distortion of each other's screen meshes (10A, B) and eliminating the distortion of the printing pattern. It is.

At this time, as a material of the screen mesh, a general polyester-based material, a metal material such as stainless steel, and also a carbon fiber can be applied. In addition, one or more screen meshes are further superimposed on the two screen meshes to be superimposed here, and
May be fixed. Furthermore, as for the plurality of screen meshes to be overlapped, the material, the number of meshes, and the wire diameter of the screen meshes may be different as long as the combination is such that the distortion of the printing pattern during actual printing is smaller than desired.

Further, as shown in FIG. 1, at least two screen meshes (10A, 10B) are fixed by a plate film (30) for limiting a printing pattern to form a screen printing plate which is integrated. It is.

The plate film (30) is generally made of a resin that has not been eluted in the development of the photosensitive resin, but is a plate film (30) formed by a lift method.
In the case of, various resins can be used. At this time, one or more superimposed screen meshes may be further superimposed on the two screen meshes and fixed to the plate frame (6). In addition, as for the plurality of screen meshes to be overlapped, the material, the number of meshes, and the wire diameter of the screen meshes may be different as long as the combination is such that the distortion of the printing pattern at the time of actual printing is smaller than desired.

As shown in FIGS. 4 and 5, at least two screen meshes (10A, 10B)
Is a screen printing plate fixed by a plating film (60). As this plating method, electroplating or electroless plating is useful. As shown in FIG. 4, two screen meshes (10A, 10B) are plated with a plating film (6).
Alternatively, the plate film (30) may be formed after fixing at 0), or as shown in FIG. 5, a plate film (30) made of resin may be formed and then fixed at the plating film (60). Alternatively, a plate mesh (30) is applied to a screen mesh (10A) as shown in FIG.
Screen mesh (10B) on the stencil
Various combinations are possible so that may be fixed by a plating film (60). At this time, superimpose here 2
One or a plurality of screen meshes may be further superimposed and fixed to the plate frame (6). In addition, as for the plurality of screen meshes to be overlapped, the material, the number of meshes, and the wire diameter of the screen meshes may be different as long as the combination is such that the distortion of the printing pattern at the time of actual printing is smaller than desired.

As described above, by firmly integrating at least two screen meshes (10A, 10B), the fixing is further strengthened, and the force for suppressing the displacement of the screen mesh is limited by a printing film that limits the printing pattern. (3
0), it is excellent in durability, eliminates displacement between screen meshes, further improves dimensional stability, and obtains a high-precision printed fine pattern.

Although two screen meshes have been described above, a plurality of screen meshes can be used in combination.

[0025]

Next, the present invention will be described more specifically with reference to examples and comparative examples. <Embodiment 1> As shown in FIG. 2 and FIG.
4mm to the aluminum pipe frame (6)
A stainless steel upper screen mesh (10A) that has been subjected to a calendar process of 00 mesh and a wire diameter of 18 μm,
The warp was fixed at a tilt angle (θ) of 17 degrees counterclockwise with respect to the printing direction (Y). At this time, in order to make the two opposite sides of the plate frame (6) parallel to the printing direction (Y), the warp of the screen mesh (10) has two sides parallel to the plate frame (6) and the printing direction (Y). It has an inclination of 17 degrees.

Next, the screen mesh (10
A) On top of the above, a negative photosensitive emulsion was applied by a bucket and dried to obtain a 20 μm negative photosensitive resin coating film.

Next, a rectangle of 280 mm × 220 mm having a line width of 100 μm was formed on the coating film of the negative photosensitive resin obtained above.
m, 280 mm long stripe pattern
A positive type mask having 1101 masks was closely attached at regular intervals of μm, and was exposed to ultraviolet rays. At this time, the stripe fine line pattern was closely adhered so as to be parallel to the printing direction (Y). Next, the unexposed portion of the negative photosensitive resin is removed with an alkaline developing solution, and an opening (40) having a shape corresponding to the positive pattern portion of the positive mask and a plate film corresponding to the other portion ( A stencil having 30) was obtained.

Next, the second lower screen mesh (10B) made of stainless steel and subjected to calendering with a mesh size of 400 μm and a wire diameter of 18 μm is passed through the tilt angle (θ) of the warp clockwise with respect to the printing direction (P). The stencil was fixed to the stencil (6) so as to overlap the stencil at 17 degrees. In this embodiment, the screen printing plate has a form in which the stencil is directly fixed to the plate frame (6). However, a combination in which the stencil is fixed to the plate frame (6) via a screen mesh (10), a metal thin film or the like. It may be a version.

Using the screen printing plate obtained above,
Printing was performed on a glass substrate under the following conditions to form a pattern.

Comparative Example 1 As shown in FIG.
0mm x 950mm aluminum pipe frame (6)
400 mesh, a stainless steel upper screen mesh (10) subjected to calendering with a wire diameter of 18 μm,
As shown in FIG. 3, the warp was fixed so that the inclination angle was 17 degrees counterclockwise with respect to the printing direction. At this time, in order to make the two opposite sides of the plate frame (6) parallel to the printing direction (Y), the warp of the screen mesh (10) has two sides parallel to the plate frame (6) and the printing direction (Y). It has an inclination of 17 degrees.

Next, the screen mesh (10)
A screen printing plate consisting of one screen mesh (10) as shown in FIG. 8 is formed by coating a negative photosensitive emulsion, drying, exposing through a positive mask, and developing in the same manner as in Example 1. I got The printing conditions were the same as in Example 1, and a pattern was formed on the glass substrate.

Example 1 of the screen printing plate of the present invention
In FIG. 6, as shown in FIG.
For the rectangular mask pattern (50), the distortion (W) of the print pattern (20) was 30 μm on the print end side (22) at the lower end of the print pattern. On the contrary,
In the conventional screen printing plate of Comparative Example 1, FIG.
As shown in FIG. 1, the distortion (V) of the conventional print pattern is 1
It was 20 μm. Further, the print pattern (20) in Example 1 had no unevenness, lack, or disconnection, and had a clear outline. In Comparative Example 1, unevenness, chipping, and breakage were not observed because the warp had a 17-degree inclination. However, when the warp was parallel to the printing direction with one conventional screen mesh, unevenness, chipping, and breakage occurred. What happens.

Example 2 As shown in FIGS. 1 and 3, a stainless steel plate frame (6) having an outer dimension of 950 mm × 950 mm and calendered with a mesh of 400 mesh and a wire diameter of 18 μm was used. The upper screen mesh (10A) was fixed so that the warp had a tilt angle (θ) of 17 degrees counterclockwise with respect to the printing direction (Y). Further, a second lower screen mesh (10B) made of stainless steel which has been subjected to calendering with a mesh of 400 mesh and a wire diameter of 18 μm so as to be superimposed on the screen mesh (10) is passed through the warp in the printing direction (Y). Plate frame (6) with a clockwise tilt angle (θ) of 17 degrees
Fixed to.

Next, a negative photosensitive emulsion was applied on the above-mentioned superposed screen meshes (10A, 10B) with a bucket and dried to obtain a coating film of a negative photosensitive resin having a thickness of 20 μm. ) And the screen mesh (10B) were integrated.

Next, a rectangle of 280 mm × 220 mm having a line width of 100 μm was formed on the negative photosensitive resin coating film obtained above.
m, 280 mm long stripe pattern
A positive type mask having 1101 masks was closely attached at regular intervals of μm, and was exposed to ultraviolet rays. At this time, the stripe fine line pattern was closely adhered so as to be parallel to the printing direction (Y). Next, the unexposed portion of the negative photosensitive resin was eluted with the same developing solution as in Example 1, and as shown in FIG. 2, an upper screen mesh (10A) and a lower screen were formed with a plate film (30) made of resin. The screen printing plate (1) to which the mesh (10B) was fixed was obtained. Using the screen printing plate obtained above, a pattern was formed on a glass substrate under the same printing conditions as in Example 1.

Example 2 of the screen printing plate of the present invention
In FIG. 6, as shown in FIG.
For the rectangular mask pattern (50), the distortion (W) of the printing pattern (20) is 10 μm or less in the direction (X) perpendicular to the printing direction (Y) on the printing end side (22) at the lower end of the printing pattern. there were. Further, the print pattern in Example 2 had no unevenness, omission, or disconnection, and had a sharper outline. In this embodiment, the screen printing plate has a form in which the stencil is directly fixed to the plate frame (6). However, a combination in which the stencil is fixed to the plate frame (6) via a screen mesh (10), a metal thin film or the like. It may be a version.

Example 3 As shown in FIGS. 4 and 3, a stainless steel plate frame (6) having an outer dimension of 950 mm × 950 mm and calendered with a mesh of 400 mesh and a wire diameter of 18 μm was used. The upper screen mesh (10A) was fixed so that the warp had a tilt angle (θ) of 17 degrees counterclockwise with respect to the printing direction (Y). Further, a second lower screen mesh (10B) made of stainless steel which has been subjected to calendering with a mesh of 400 mesh and a wire diameter of 18 μm so as to be superimposed on the screen mesh (10) is passed through the warp in the printing direction (Y). Plate frame (6) with a clockwise tilt angle (θ) of 17 degrees
Fixed to.

Next, electroplating is applied to the two screen meshes (10A, 10B) which are superposed, and the two screen meshes (10A, 10A,
OB).

Next, in the same manner as in Example 1, a negative photosensitive emulsion was applied, dried, exposed through a positive mask, developed, and a pattern was formed on a glass substrate under the same printing conditions.

Example 3 of the screen printing plate of the present invention
In FIG. 6, as shown in FIG.
For the rectangular mask pattern (50), the distortion (W) of the printing pattern (20) is 10 μm or less in the direction (X) perpendicular to the printing direction (Y) on the printing end side (22) at the lower end of the printing pattern. there were. Further, the printed pattern in Example 3 had no unevenness, omission, or disconnection, and had a sharper outline. In this embodiment, the screen printing plate has a form in which the stencil is directly fixed to the plate frame (6). However, a combination in which the stencil is fixed to the plate frame (6) via a screen mesh (10), a metal thin film or the like. It may be a version.

<Embodiment 4> As shown in FIGS. 5 and 3, the stencil obtained in Embodiment 1 and the screen mesh (10B) below the stencil were subjected to electroplating. Screen mesh (10A,
B) was integrated. In this embodiment, the screen printing plate has a form in which the stencil is directly fixed to the plate frame (6). However, a combination in which the stencil is fixed to the plate frame (6) via a screen mesh (10), a metal thin film or the like. It may be a version.

Embodiment 4 Using Screen Printing Plate of the Present Invention
In FIG. 6, as shown in FIG.
For the rectangular mask pattern (50), the distortion (W) of the printing pattern (20) is 10 μm or less in the direction (X) perpendicular to the printing direction (Y) on the printing end side (22) at the lower end of the printing pattern. there were. Further, the print pattern in Example 4 had no unevenness, lack, or disconnection, and had a sharper outline.

[0043]

As described above, the present invention has the following effects. That is, in a screen printing plate comprising at least a plate frame and a stencil, and the stencil comprises a screen mesh and a plate film for limiting a printing pattern, the screen mesh comprises two or more sheets,
Since at least two screen meshes are overlapped at an inclination angle that is symmetrical with respect to the printing direction to form a screen printing plate, the printed fine pattern has high dimensional stability, and the fine pattern is missing or broken. It is possible to form a fine pattern without the like.

Further, since the at least two screen meshes are fixed by a plate film for limiting a printing pattern, a fine pattern having higher dimensional stability can be obtained.

Further, since the at least two screen meshes are more firmly fixed by the plating film, the force for suppressing the displacement of the screen mesh is excellent in the durability because it is not applied to the plate film for limiting the printing pattern. It is possible to provide a screen printing plate capable of forming a fine pattern with minimal distortion and a higher dimensional stability, and without forming a fine pattern missing or disconnection.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a screen printing plate according to an embodiment of the present invention in a side cross section.

FIG. 2 is an explanatory view showing a screen printing plate according to another embodiment of the present invention in a side cross section.

FIG. 3 is a schematic diagram illustrating a tilt angle of a screen mesh according to an embodiment of the present invention.

FIG. 4 is an explanatory view showing a screen printing plate according to another embodiment of the present invention in a side cross section.

FIG. 5 is an explanatory view showing a screen printing plate according to another embodiment of the present invention in a side cross section.

FIG. 6 is an explanatory diagram schematically showing an example of a printing pattern obtained by the screen printing plate of the present invention.

FIG. 7 is an explanatory diagram schematically showing an example of a print pattern obtained by a conventional screen printing plate.

FIG. 8 is an explanatory view showing a screen printing plate according to a conventional embodiment in a side cross section.

[Explanation of symbols]

 1 Screen printing plate 6 Plate frame 10 Screen mesh 10A Upper screen mesh 10B Lower screen mesh 20 Printing pattern 22 Lower end printing end 30 Plate film θ ‥ Tilt angle P ‥‥ Printing direction X ‥‥ Direction perpendicular to printing direction 40 方向 Opening 50 ‥‥ Mask pattern 60 ‥‥ Plating film

Claims (3)

[Claims] 1. A screen printing plate comprising at least a plate frame and a stencil, wherein said stencil comprises a screen mesh and a plate film for limiting a printing pattern, wherein said screen mesh comprises two or more sheets, and at least two screen meshes. A screen printing plate characterized in that the eyes are superimposed at an inclination angle such that the eyes are symmetric with respect to the printing direction. 2. A screen printing plate according to claim 1, wherein said at least two screen meshes are fixed by a plate film for limiting a printing pattern. 3. The screen printing plate according to claim 1, wherein the at least two screen meshes are fixed by a plating film.