JP2022107073A - Screen printing plate and method for manufacturing the same - Google Patents

Abstract

To provide a screen printing plate that enables high-resolution micropattern printing and has excellent durability.SOLUTION: Provided are: a screen printing plate including a frame, a screen stretched on the frame, and a resist pattern layer having an opening part arranged on the screen. The resist pattern layer includes an outer edge region having relatively low piercing strength, extending along the opening part, and besides the outer edge region, a central region having relatively high piercing strength; and a method for manufacturing the screen printing plate.SELECTED DRAWING: Figure 1

Description

The present invention relates to a screen printing plate capable of high-resolution fine pattern printing and having excellent durability.

Generally, there is a screen printing method as a method for forming a desired image or pattern in a large amount and efficiently, and is widely used for forming wiring patterns, electrodes, and the like of various electronic components, for example. In recent years, in response to demands for miniaturization and high performance of electronic parts, etc., screen printing has been required to have higher accuracy, and at the same time, it has high durability in order to maximize the advantages of the screen printing method. More and more sought after.

However, if the thickness and rigidity of the resist layer are increased to improve durability, it tends to be difficult to print a high-resolution fine pattern, while the resist layer is used to facilitate printing of the fine pattern. If the thickness is reduced or the flexibility of the resist layer is increased, the durability may be insufficient.

In order to improve the accuracy and durability of the resist layer of the screen printing plate, many improvements have been made to the photosensitive resin forming the resist layer. For example, a photosensitive resin composition obtained by blending an ethylenically unsaturated compound and a photoradical polymerizable initiator with polyvinyl alcohol to which a stillvazolium group is added as a photosensitive group, or polyvinyl alcohol to which a diazonium salt or dichromic acid is added (Japanese Patent Laid-Open No. (Showa 60-10243), a photosensitive resin composition (International Publication No. 2007/132532) in which a radically polymerizable monomer having an anionic dissociation ability is blended with polyvinyl alcohol also added with a stillvazolium group, and further radically polymerized with polyvinyl alcohol. A sensitive energy ray resin composition (Japanese Patent Laid-Open No. 2005-208070) in which a sex monomer and a cationically polymerizable monomer are used in combination has been proposed.

In order to realize printing of fine patterns in screen printing, it is extremely important that the resist layer of the screen printing plate and the printed matter are firmly adhered to each other, and for that purpose, it is necessary to increase the flexibility of the resist layer. On the other hand, in order to increase the durability of the screen printing plate, a certain level of strength is required. Therefore, there is a trade-off relationship between increasing the fine lines of screen printing and increasing the strength of the resist layer.

In order to overcome this situation, efforts have also been made in the structure of screen printing plates. For example, a printing plate for screen printing provided with a second resist layer is disclosed so as to protect the first resist layer of the screen printing plate (Japanese Unexamined Patent Publication No. 2017-10067).

Japanese Unexamined Patent Publication No. 2017-100367

In Patent Document 1, it is proposed that the first screen layer and the second screen layer are appropriately changed according to the type of printed matter and print paste, the type and size of foreign substances that are likely to be generated, and the like. , A screen printing plate in which the thickness of the first screen layer is 20 μm and the thickness of the second screen layer is 30 μm is presented. However, with the thicknesses presented, it is extremely difficult to form high resolution fine patterns. Furthermore, reducing the thickness to form a fine pattern diminishes the meaning of the second layer as a protective layer, as the second screen layer may be thinner than the first screen layer. As a result, the durability of the resist layer will be insufficient.

The present invention has been made to solve the above-mentioned problems, and relates to a screen printing plate having both high-resolution fine pattern printing suitability and high durability of a resist layer, and a method for manufacturing the same. Is.

Therefore, the screen printing plate according to the present invention includes a frame, a screen stretched on the frame, and a resist pattern layer arranged on the screen and having an opening through which printing ink can pass. It's a screen print version
The resist pattern layer has an outer edge region having a relatively low piercing strength along the opening, and a central region having a relatively high piercing strength as a region other than the outer edge region. Includes those characterized by that.
Such a screen printing plate preferably includes a screen printing plate in which the piercing strength of the central region is at least 0.1 N or more higher than the piercing strength of the outer edge region (where, the piercing strength is: According to JIS Z1707: 1997).

In such a screen printing plate, as a preferred embodiment, the piercing strength of the central region is 1.2 times or more higher than the piercing strength of the outer edge region (where, the piercing strength is JIS Z1707: By 1997).
In such a screen printing plate, as a preferred embodiment, the outer edge region and the central region are both exposed on the surface of the resist pattern layer on the printing surface side, and both come into contact with the printed matter during screen printing. , Includes screen-printed plates.

Such a screen printing plate preferably includes a screen printing plate in which the thickness of the central region is the same as or thinner than the thickness of the outer edge region.
Such a screen printing plate preferably includes a screen printing plate in which the thickness of the central region is 25 to 100% of the thickness of the outer edge region.
In such a screen printing plate, as a preferred embodiment, when the screen printing plate is observed from the printing surface side, the area of the outer edge region is 1 to 50%, and the area of the central region is 50 to 99%. , Screen printing plate (here, the total area of the outer edge region and the central region is 100%).
Such a screen printing plate preferably includes a screen printing plate in which the central region has a higher wear resistance than the outer edge region.
Such a screen printing plate preferably includes a screen printing plate in which the central region has higher chemical resistance than the outer edge region.

Further, the method for producing a screen printing plate according to the present invention is characterized in that the resist pattern layer is formed with a resist layer in an outer edge region and then a resist layer in the central region.
Further, the method for producing a screen printing plate according to the present invention is characterized in that the resist pattern layer is formed with a resist layer in a central region and then a resist layer in an outer edge region.
Such a method for producing a screen printing plate includes, as a preferred embodiment, a method in which one or both of the resist layer in the outer edge region and the resist layer in the central region are formed by a photoengraving method.
A method for producing such a screen printing plate includes, as a preferred embodiment, a method in which one or both of the resist layer in the outer edge region and the resist layer in the central region are formed by a laser cut or a laser ablation method.

In the screen printing plate of the present invention, the resist layer forming a pattern on the screen surface has a central portion having a relatively high piercing strength and an outer edge portion having a relatively lower piercing strength than the central portion. In addition to being able to print fine patterns with high resolution, it is highly durable. That is, both high-resolution fine pattern printing and high durability are compatible.

1A is a bottom view of the screen printing plate of the present invention, and FIG. 1B is a cross-sectional view. FIG. 2A is a bottom view of the screen printing plate of the present invention, and FIG. 2B is a sectional view. FIG. 3A is a bottom view of the screen printing plate of the present invention, and FIG. 3B is a sectional view. The figure which shows the outline of the manufacturing method of the screen printing plate of this invention. The figure which shows the outline of the manufacturing method of the screen printing plate of this invention. The figure which shows the outline of the manufacturing method of the screen printing plate of this invention. The figure which shows the outline of the manufacturing method of the screen printing plate of this invention. The figure which shows the outline of the manufacturing method of the screen printing plate of this invention. The figure which shows the outline of the manufacturing method of the screen printing plate of this invention. The figure which shows the outline of the manufacturing method of the screen printing plate of this invention.

Hereinafter, the present invention will be described with reference to the drawings as necessary.

[Screen printing version]
1 to 3 are schematic views showing an outline of a preferable specific example included in the screen printing plate according to the present invention, and FIGS. 1A, 2A and 3A are in contact with a printed matter when performing screen printing. It is a bottom view seen from the surface side, and FIGS. 1B, 2B and 3B are cross-sectional views of the screen printing plate shown in FIGS. 1A, 2A and 3A.

In these figures and the following, the resist pattern layer 5 collectively refers to the resist pattern layers 51 to 58, the outer edge region 6 collectively refers to the outer edge regions 61 to 68, and the central region 7 refers to the central region 7. , Central regions 71 to 78 are collectively referred to.

<Screen printing plate (Fig. 1A and Fig. 1B)>
The screen printing plate 1 shown in FIGS. 1A and 1B has a frame 2, a screen 3 stretched on the frame 2, and an opening 4 arranged on the screen 3 through which printing ink can pass. A screen printing plate including the resist pattern layer 5 and the like.
The resist pattern layer 5 has an outer edge region 6 having a relatively low piercing strength along the opening 4, and a center having a relatively high piercing strength as a region other than the outer edge region 6. A screen-printed plate in which the region 7 exists.

In a preferred embodiment shown in FIGS. 1A and 1B, a resist pattern layer 5 having an opening 4 through which printing ink can pass is arranged on the screen 3, and the resist pattern layer 5 is formed by a plurality of resist patterns. It is composed of an aggregate of layers 51 to 58 (or the resist pattern layer 5 is divided into a plurality of resist pattern layers 51 to 58). At this time, the portion of the screen 3 between each resist pattern layer 51 to 58 and another resist pattern layer adjacent thereto, and the portion of the screen 3 between each resist pattern layer 51 to 58 and the frame 2 are screens. It can function as an opening 4 through which printing ink can pass during printing.

The shape, area, and number of resist pattern layers of each of the resist pattern layers 51 to 58, as well as the shape, width, area, and number of openings 4 through which printing ink can permeate, are, for example, desired screen printing. It goes without saying that it can be appropriately changed according to the pattern, and that the screen-printed plate in which these are changed is included in the scope of the present invention.

The resist pattern layer 5 (resist pattern layers 51 to 58) has an outer edge region 6 (outer edge regions 61 to 68) having a relatively low piercing strength along the opening 4. As a region other than the outer edge region 6, there is a central region 7 (central regions 71 to 78) having a relatively high piercing strength.

Here, "relative" means "a state that holds true in relation to and comparison with others." Therefore, the "outer edge region having a relatively low piercing strength" specifically means "the piercing strength is low in comparison with the central region". Further, the "central region having a relatively high piercing strength" specifically means "a high piercing strength in comparison with the outer edge region".

Here, the "piercing strength" is defined by JIS Z1707: 1997. Specifically, both the outer edge region 6 of the resist pattern layer and the central region 7 of the resist pattern layer are pierced with a needle having a diameter of 1 mmΦ and a tip shape radius of 0.5 mm at a piercing speed of 50 mm / min, and the needle penetrates. The load (N) at the time of piercing was measured and used as the piercing strength. However, the thickness of the measurement film was unified to 10 to 30 μm.

In the screen printing plate according to the present invention, the piercing strength of the central region 7 is preferably 0.1N or more higher than the piercing strength of the outer edge region 6, and more preferably 0.5N or more, more preferably 1.0N or more. Higher ones are particularly preferred (where the piercing strength is according to JIS Z1707: 1997).

In the screen printing plate according to the present invention, the piercing strength of the central region 7 is preferably 1.2 times or more higher than the piercing strength of the outer edge region 6, and more preferably 1.3 times or more. Those that are 1.5 times or more higher are particularly preferable (here, the piercing strength is based on JIS Z1707: 1997).

In the preferred screen printing plate according to the present invention, the outer edge region 6 and the central region 7 are both exposed on the surface of the printing surface side X of the resist pattern layer 5, and both come into contact with the printed matter when performing screen printing. Is what you do. Specifically, as shown in FIGS. 1A and 1B, the outer edge regions 61 to 68 and the central regions 71 to 78 are both exposed on the surface of the resist pattern layers 51 to 58 on the print surface side, and screen printing is performed. It is preferable that the printed matter can be in contact with the printed matter at the same time. The screen printing plate according to the present invention is not limited to a plate in which all the central regions and the outer edge regions of all the resist pattern layers come into contact with the printed matter at the time of screen printing. A screen printing plate in which the central region and / or the outer edge region of the resist pattern layer does not partially contact the printed matter can also be included.

The thickness T of the resist pattern layer 5 including the central region 7 and the outer edge region 6 of the resist pattern layer 5 is not limited as long as screen printing is possible, but is preferably 10 to 1000 μm, respectively. It is more preferably ~ 100 μm, particularly preferably 15-50 μm (where T is the total thickness of the resist pattern layer 5 as shown in FIG. 1B).

The thickness of the central region 7 is preferably the same as or thinner than that of the outer edge region 6. For example, the thickness of the central region 7 is preferably 25 to 100%, more preferably 50 to 100%, and particularly preferably 70 to 100% of the thickness of the outer edge region 6 (). Here, the thickness of the outer edge region 6 is 100%). When the thickness of the central region 7 is thicker than the thickness of the outer edge region 6, adhesion to the printed matter is poor and high-definition printing may be difficult. On the other hand, if the thickness of the central region 7 is thin, the piercing strength may not be sufficiently obtained.

The thickness of the resist pattern layer (that is, the distance between the surface of the mesh 3 and the surface of the resist pattern layer) t1 at the squeegee surface (that is, the surface on the side where the squeegee contacts during screen printing) Y of the screen printing plate is 0. It is preferably 1 to 10 μm, more preferably 0.5 to 3 μm, and particularly preferably 1 to 2 μm.

The ratio of the area of the outer edge region 6 to the area of the central region 7 on the surface X of the resist pattern layer 5 on the print surface side (that is, the surface that comes into contact with the printed matter during screen printing) can be appropriately determined. .. For example, when the resist pattern layer 51 is observed from the printed surface side (that is, the contact surface side with the printed matter), the area of the outer edge region 61 is 1 to 99%, and the area of the central region 71 of the resist pattern layer is 1. It can be in the range of ~ 99%. Preferably, the area of the outer edge region is 1 to 50%, and the area of the central region can be 50 to 99% (here, the total area of the outer edge region 61 and the central region 71 is 100%). ..

The larger the area ratio of the outer edge region 61, the more advantageous in terms of high resolution and printability, while the larger the area ratio of the central region 71, the more advantageous in terms of durability. In consideration of the balance between the characteristics of high resolution, printability and durability, it is preferable that the area of the outer edge region is 1 to 50% and the area of the central region is 50 to 99%.

In the preferred screen printing plate according to the present invention, in consideration of the durability of the resist pattern layer, it is preferable that both the resist layer in the outer edge region 6 and the resist layer in the central region 7 have high wear resistance. In the present invention, the central region 7 may have higher wear resistance than the outer edge region 6, and in the same case, the wear resistance may be lower. In order to further enhance the durability during screen printing, it is preferable that the central region 7 has higher wear resistance than the outer edge region 6. Here, the wear resistance is such that both the resist layer in the outer edge region 6 and the resist layer in the central region 7 are reciprocated 100 times with a waste cloth immersed in a solvent under the same wear conditions (for example, while applying a load of 1 kg / cm ² ). It can be confirmed from the degree of decrease in the layer thickness of the resist layer in the outer edge region 6 and the resist layer in the central region 7 when the resist layer is attached to the outer edge region 6.

In the screen printing plate according to the present invention, in consideration of the durability of the resist pattern layer, it is preferable that both the resist layer in the outer edge region 6 and the resist layer in the central region 7 have high chemical resistance. In the present invention, the central region 7 may have higher chemical resistance than the outer edge region 6, and in the same case, the chemical resistance may be lower. In order to further enhance the durability during screen printing, it is preferable that the central region 7 has higher chemical resistance than the outer edge region 6. Here, the chemical resistance can be confirmed by the weight change when the sections of each layer are immersed in the same type of solvent for 24 hours.

In the preferred screen printing plate 1 according to the present invention shown in FIGS. 1A and 1B, a plurality of resist pattern layers are arranged on the same screen 3, and the outer edge region and the central region existing in the same resist pattern layer The above relationship is established in the relative relationship regarding the piercing strength between the two. For example, as shown in FIGS. 1A and 1B, the outer edge region 61 and the central region 71 existing in the same resist pattern layer 51 have a relationship that the central region 71 has higher piercing strength. ..

The outer edge regions (outer edge regions 61 to 68) existing in each of the plurality of resist pattern layers (for example, resist pattern layers 51 to 58) have the same absolute value of the "piercing strength" and different cases. There is. Similarly, the plurality of central regions (central regions 71 to 78) may have the same absolute value of "piercing strength" or may differ from each other.

The shape and size (area) of each of the plurality of resist pattern layers (for example, resist pattern layers 51 to 58) may be the same or different, and the plurality of outer edge regions (outer edge regions) may be different. The shapes and sizes (areas) of 61 to 68) or a plurality of central regions (central regions 71 to 78) may be the same or different, and the area of the outer edge region and the central region may be different. The ratio to the area of the above, the thickness of the outer edge region and / or the central region, and the thickness ratio thereof may be the same or different, but both are included within the scope of the present invention.

However, when manufacturing a screen printing plate in which a plurality of resist pattern layers are formed, or when the screen printing plate is used for screen printing, the plurality of resist pattern layers have an outer edge region or a central region thereof. If the absolute value of the piercing strength and the special effect and convenience of positively different thicknesses cannot be expected, the absolute value and thickness of the piercing strength of each resist pattern layer, outer edge region and central region. Are usually the same or similar, and are preferred.

According to the preferred method for producing a screen printing plate of the present invention, which will be described later, it is easy to produce a screen printing plate in which a plurality of resist pattern layers having the same or similar puncture strength and thickness in a plurality of outer edge regions and central regions are formed. It can be manufactured efficiently and efficiently.

<Screen printing plate (Fig. 2A and Fig. 2B)>
In the screen printing plate 1 shown in FIGS. 1A and 1B, no resist layer is formed in the portion between the resist pattern layers 51 to 58 and the frame 2, but the resist pattern layers 51 to 58 and the resist pattern layers 51 to 58 are formed. Another resist layer may be present in the portion between the frame 2 and the frame 2.

2A and 2B are diagrams showing an outline of a preferable specific example of the screen printing plate 11 of the present invention in which such another resist layer is present.

In the screen printing plate 11 shown in FIGS. 2A and 2B, another resist pattern layer 59 is formed on the inner portion of the frame 2, and the other resist pattern layer 59 is the inner portion of the frame 2. In addition, a region 79 having a high piercing strength exists, and a region 69 having a low piercing strength exists inside the region 79.

Here, the configuration other than the resist pattern layer 59 including the region 69 and the region 79 is the same as that of the screen printing plate 1 shown in FIGS. 1A and 1B.

The region 79 of the other resist pattern layer 59 is not particularly limited, but is preferably the central region 7 (71 to 78) having a relatively high piercing strength, which is adopted in the screen printing plate 1 of FIGS. 1A and 1B. It can be formed using the same material as. The region 69 is also not particularly limited, but is preferably the same material as the outer edge region 6 (61 to 68) having a relatively low piercing strength, which is adopted in the screen printing plate 1 of FIGS. 1A and 1B. Can be formed.

<Screen printing plate (Fig. 3A and Fig. 3B)>
In the screen printing plate 1 shown in FIGS. 1A and 1B, no resist layer is formed in the portion between the resist pattern layers 51 to 58 and the frame 2, but the resist pattern layers 51 to 58 and the resist pattern layers 51 to 58 are formed. Another resist layer may be present in the portion between the frame 2 and the frame 2.

3A and 3B are diagrams showing an outline of a preferable specific example of the screen printing plate 12 of the present invention in which such another resist layer is present.

In the screen printing plate 12 shown in FIGS. 3A and 3B, a region 69 having a low piercing strength exists in the inner portion of the frame 2, a region 79 having a high piercing strength exists inside the region 69, and a piercing strength region 79 exists inside the region 69. There is a low region 69.

Here, the configuration other than the resist pattern layer 59 including the region 69 and the region 79 is the same as that of the screen printing plate 1 shown in FIGS. 1A and 1B.

The region 79 of the other resist pattern layer 59 is not particularly limited, but is preferably the central region 7 (71 to 78) having a relatively high piercing strength, which is adopted in the screen printing plate 1 of FIGS. 1A and 1B. It can be formed using the same material as. The region 69 is also not particularly limited, but is preferably the same material as the outer edge region 6 (61 to 68) having a relatively low piercing strength, which is adopted in the screen printing plate 1 of FIGS. 1A and 1B. Can be formed.

[Manufacturing method of screen printing plate]
The preferred screen printing plate according to the present invention can be preferably produced by forming a resist pattern layer in the outer edge region 6 and then forming a resist layer in the central region 7. Alternatively, it can be produced by forming a resist layer in the central region 7 and then forming a resist layer in the outer edge region 6.

4 to 10 show an outline of a preferable specific example of the former manufacturing method (that is, a method of forming a resist layer in the outer edge region 6 and then forming a resist layer in the central region 7). Is.

Hereinafter, a method for producing a preferable screen printing plate (particularly, the screen printing plate 11 of FIGS. 2A and 2B) according to the present invention will be described with reference to FIGS. 4 to 10.

First, a frame 2 (FIG. 4) in which the screen mesh 3 is attached to the frame 2 with a constant tension is prepared.

Next, the photosensitive material 6'that forms the resist layer in the outer edge region 6 of the resist pattern layer 5 is applied to the screen mesh 3 to a predetermined thickness, or a sheet-like photosensitive material previously formed to a predetermined thickness. 6 ”is pasted (Fig. 5).

Then, the photosensitive materials 6'and 6 "are exposed through the positive film 8 or the glass mask 8'to cure the exposed portion (FIG. 6). This partially cured product is exposed to the unexposed portion. By subjecting to a development process consisting of removing the sex materials 6'and 6 ", a screen printing plate on which the resist layer of the outer edge region 6 is formed is obtained (FIG. 7).

Next, the photosensitive material 7'that forms the resist layer of the central region 7 is applied to a screen printing plate (FIG. 7) on which the outer edge region 6 is formed to a predetermined thickness, or is formed in advance to a predetermined thickness. The sheet-shaped photosensitive material 7 "is attached (FIG. 8), and then the photosensitive materials 7'and 7" are exposed via the positive film 9 or the glass mask 9'. The exposure at this time can be performed from the direction of the surface side (that is, the lower surface side) in contact with the printed matter, or can be performed from the surface side (that is, the upper surface side) in which the squeegee contacts, or these. It can be done from both sides (Fig. 9).

After that, the screen printing plate according to the present invention can be manufactured by removing the photosensitive materials 7'and 7 "in the unexposed portion by subjecting it to a developing process (FIG. 10).

Here, FIGS. 5 to 7 show a case where a negative type photosensitive material is used as the photosensitive materials 6'and 6 ", and FIGS. 8 to 9 show the photosensitive material. The case where the negative type photosensitive material is used as 7', 7'is shown.

However, the preferred screen printing plate according to the present invention can use a positive photosensitive material as the photosensitive material 6', 6 "and a positive photosensitive material as the photosensitive material 7', 7". Materials can be used.

Further, as a preferable screen printing plate according to the present invention, for example, a direct drawing exposure machine using ultraviolet laser light is used without using the positive film 8 or glass mask 8'and the positive film 9 or glass mask 9'as described above. Therefore, the photosensitive materials 6'and 6 "and the photosensitive materials 7'and 7" can be cured.

The above-mentioned manufacturing method is a method of forming both the resist layer of the outer edge region 6 and the resist of the central region 7 by a photoplate making method, but the screen printing plate according to the present invention is only based on such a photoplate making method. Instead, both or one of the resist layer in the outer edge region 6 and the resist in the central region 7 can be produced by laser cutting or laser ablation.

The resist pattern layer 59 including the regions 69 and 79 can be formed when each step is performed, as shown in FIGS. 4 to 10.

<Example 1>
Making screen printing plate
A screen printing plate for printing solar cell electrodes having the configuration shown below was prepared.
-Screen frame: outer dimensions 380 mm x 380 mm, inner dimensions 330 mm x 330 mm
-Inner mesh: 280 mm x 280 mm High-strength stainless steel mesh (thread diameter 16 μm, 360 mesh / inch) with calendar processing to a gauze thickness of 20 μm-Outer mesh: polyester mesh (thread diameter 54 μm, 200 mesh / inch)
A photosensitive material (manufactured by Murakami Co., Ltd., "ADVANCE20" (trade name), piercing strength 1.2N) that forms an outer edge region is applied to a region of 250 mm in length × 250 mm in width in the center of the inner mesh. After drying, a photosensitive material layer having a thickness (T) of 35 μm including the thickness of the gauze was formed.
In order to form an electrode pattern on the photosensitive material layer formed above, a positive film on which an electrode pattern having a line width of 30 μm is drawn is attached to the surface thereof, and then exposure and development treatment are performed to obtain a solar cell. A resist pattern layer in the outer edge region suitable for printing the electrode pattern of the panel was prepared.
Next, a photosensitive material (manufactured by Murakami Co., Ltd., "SP-1500" (trade name), piercing strength 1.5N) that forms the central region is applied, dried, and photosensitive with a thickness of T33 μm including the thickness of the gauze. A sex material layer was formed.

A positive film is attached to the front surface of the photosensitive material layer formed above so as to hide the electrode pattern, and a similar positive film is attached to the back surface, and then exposure and development treatment are performed to obtain the solar cell panel. A screen printing plate having a resist pattern layer in an outer edge region and a central region suitable for electrode pattern printing was produced.

A polycrystalline silicon wafer with a rating of 155 mm × 155 mm and a thickness of 180 μm was fixed to the printing stage of a printing machine (“MT-550TV” (trade name) manufactured by Microtech), and the screen printing plate obtained above was used. , Solar cell electrode silver paste ("SOL9641B" (trade name) manufactured by Helius Co., Ltd.) was used for screen printing.
The fine line printability and durability after printing 10000 times were visually observed. The results are as shown in Table 1.
In the printability evaluation in Table 1, those having extremely thin or thick line widths were marked with x, and those with otherwise beautiful prints were marked with 〇.
In the durability evaluation in Table 1, those that were scratched or damaged due to the contact of the wafer edge or foreign matter on the photosensitive resin film portion of the screen printing plate were evaluated as x, and those that were not were evaluated as 〇.

<Comparative Examples 1, 2, 3>
A screen printing plate was produced in the same manner as in Example 1 except as specified in Table 1.
The above screen-printed plate was evaluated in the same manner as in Example 1.
The results are as shown in Table 1.

<Comparative example 4>
A screen printing plate for printing solar cell electrodes having the configuration shown below was prepared.
-Screen frame: outer dimensions 380 mm x 380 mm, inner dimensions 330 mm x 330 mm
-Inner mesh: 280 mm x 280 mm high-strength stainless steel mesh (thread diameter 16 μm,
360 mesh / inch) with calendar processing to make the gauze thickness 20 μm ・ Outer mesh: Polyester mesh (thread diameter 54 μm, 200 mesh / inch)
The first screen layer is coated with a photosensitive material (Murakami Co., Ltd., "ADVANCE20" (trade name)) in a region of 250 mm in length × 250 mm in width in the center of the inner mesh, dried, and thickened. A photosensitive material layer having a thickness T of 30 μm including the above was formed.
In order to form an electrode pattern on the photosensitive material layer formed above, a positive film on which an electrode pattern having a line width of 30 μm is drawn is attached to the surface thereof, and then exposure and development treatment are performed to form one layer. An electrode pattern for the eyes was made.
Next, the second screen layer is coated with a photosensitive material (manufactured by Murakami Co., Ltd., "SP-1500" (trade name)) on top of the first layer, dried, and has a thickness of 5 μm. Was formed.

In order to form an electrode pattern on the photosensitive material layer formed above, a desired positive film is attached to the surface thereof, and then exposure and development treatment are performed, which is suitable for printing an electrode pattern on a solar cell panel. A screen printing plate was produced.
The screen printing plate was evaluated in the same manner as in Example 1.
The results are as shown in Table 1.

<Comparative Examples 5 and 6>
The screen printing plates of Comparative Examples 5 and 6 were produced in the same manner as in Comparative Example 4 except for the film thicknesses specified in Table 1.
The screen printing plate was evaluated in the same manner as in Example 1.
The results are as shown in Table 1.

1, 11, 12 Screen printing plate 2 Frame 3 Screen 4 Opening 5 Resist pattern layer 6 Outer edge area 7 Central area 6', 6 ", 7', 7" Photosensitive material

Claims (13)

A screen printing plate comprising a frame, a screen stretched on the frame, and a resist pattern layer arranged on the screen and having an opening through which printing ink can permeate.
The resist pattern layer has an outer edge region having a relatively low piercing strength along the opening, and a central region having a relatively high piercing strength as a region other than the outer edge region. A screen-printed version that features that. The screen printing plate according to claim 1, wherein the piercing strength of the central region is at least 0.1N or more higher than the piercing strength of the outer edge region (where, the piercing strength is based on JIS Z1707: 1997). .. The screen printing plate according to claim 1 or 2, wherein the piercing strength of the central region is 1.2 times or more higher than the piercing strength of the outer edge region (where, the piercing strength is based on JIS Z1707: 1997. be). The outer edge region and the central region are both exposed on the surface of the resist pattern layer on the printing surface side, and both come into contact with the printed matter during screen printing, according to any one of claims 1 to 3. The screen-printed version of the description. The screen printing plate according to any one of claims 1 to 4, wherein the thickness of the central region is the same as or thinner than the thickness of the outer edge region. The screen printing plate according to claim 5, wherein the thickness of the central region is 25 to 100% of the thickness of the outer edge region. According to any one of claims 1 to 6, when the screen printing plate is observed from the printing surface side, the area of the outer edge region is 1 to 50% and the area of the central region is 50 to 99%. The screen-printed plate described (here, the total area of the outer edge area and the central area is 100%). The screen printing plate according to any one of claims 1 to 7, wherein the central region has higher wear resistance than the outer edge region. The screen printing plate according to any one of claims 1 to 8, wherein the central region has higher chemical resistance than the outer edge region. The method for manufacturing a screen printing plate according to any one of claims 1 to 9 above.
A method for producing a screen printing plate, which comprises forming a resist layer in an outer edge region of the resist pattern layer and then forming a resist layer in the central region. The method for manufacturing a screen printing plate according to any one of claims 1 to 9 above.
A method for producing a screen printing plate, which comprises forming a resist layer in a central region of the resist pattern layer and then forming a resist layer in the outer edge region. The method for producing a screen printing plate according to claim 10 or 11, wherein one or both of the resist layer in the outer edge region and one or both of the resist layers in the central region are formed by a photoengraving method. The method for producing a screen printing plate according to claim 10 or 11, wherein one or both of the resist layer in the outer edge region and one or both of the resist layers in the central region are formed by a laser cutting or laser ablation method.

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