JP2000255175A - Screen printing mesh material and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the elongation and distortion of a meshy material and make it possible to maintain the dimensional accuracy of a printed image high by a method wherein the meshy material for a screen printing is formed by weaving a wire material made of a metal fine wire or a synthetic resin into a meshy material so as to integrally bond together wire materials adjacent to each other at their intersecting part. SOLUTION: A stainless steel wire as a wire material 2 is woven in a plain fabric structure. After being degreased and cleansed, the obtained meshy material is pinched by molybdenum plates 3 from above and below so as to keep on giving predetermined pressing forces P to the meshy material by placing weights 4 on the molybdenum plates 3. By heat-treating the meshy material under the above state in a heating oven adjusted under N2 gas atmosphere, the wire materials are diffusibly bonded together, resulting in completing a required meshy material 1 for screen printing. After a flexible photosensitive resin film is uniformly applied on the surface of the meshy material 1 for the screen printing, a printing screen plate is formed by exposing and developing an image. By employing the screen plate, the screen printing is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh material for screen printing and a method for producing the same, and in particular, there is little deformation, distortion and bleeding even when used for a long time.
The present invention relates to a screen printing mesh material capable of maintaining high dimensional accuracy of a fine print image and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a screen printing method in which ink is extruded from openings of a screen (mesh material) formed with predetermined openings and printing is performed, a screen plate is manufactured by crushing the openings of the screen other than a printing pattern. It is easy to use and has the advantage of forming a relatively thick printing ink film. Therefore, it is widely used as a pattern printing method for various electronic parts such as printed circuits, IC circuits, liquid crystal displays, and plasma displays. Have been.

[0003] As the screen (mesh material),
Usually, a mesh material formed by weaving (braiding) a wire material such as a stainless steel wire or a synthetic fiber such as polyester or nylon in addition to a silk cloth has been used.

[0004]

However, the conventional silk mesh material has a drawback of low durability, while the mesh material prepared by knitting synthetic fibers or the like has a disadvantage.
Since a mesh size of only about 00 mesh was obtained, there was a problem that it was difficult to obtain a printed image having a high dimensional accuracy particularly required for circuit printing of electronic components and the like.

[0005] Even when a printed image with sufficient dimensional accuracy is obtained in the early stage of use, the intersection of the wires constituting the mesh material shifts as the number of printings increases with long use, and the screen plate is shifted. There has also been a problem that the dimensional accuracy of the printed image is reduced with time due to elongation and distortion of the whole.

Further, there is also a problem that an ink pool is easily formed in a knitted portion of the wire, and a blur occurs in a printed image. This problem is also observed in a mesh material formed by knitting a metal wire such as a stainless steel wire, and in any case, the high dimensional accuracy required for the electronic component as described above is maintained for a long time. It is necessary to replace the mesh material at a high frequency, which requires a great deal of labor for maintenance and management of the printing apparatus, and lowers the production efficiency of electronic components and the product yield.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to maintain high dimensional accuracy of a fine printed image with less occurrence of deformation, distortion and bleeding even when used for a long time. It is an object of the present invention to provide a screen printing mesh material and a method for manufacturing the same.

[0008]

Means for Solving the Problems In order to achieve the above object, the present inventors reduced the elongation and distortion of the mesh material,
In addition, various measures were taken to prevent ink from being formed on the mesh material. As a result, particularly when the adjacent wires are integrally joined and fixed by diffusion bonding or resin joining at a portion where the wires constituting the mesh intersect, the elongation, deformation and distortion of the mesh material can be effectively reduced, and It has been found that the formation of ink pools is effectively eliminated. The present invention has been completed based on the above findings.

That is, the mesh material for screen printing according to the present invention is made of a mesh material formed by weaving a wire made of a thin metal wire or a synthetic fiber in a net shape, and integrally joining adjacent wires at a portion where the wires intersect. It is characterized by being joined.

It is preferable that the wire is made of a thin metal wire and adjacent wires are integrally joined by diffusion bonding. Further, the wire is preferably made of a thin metal wire, and a nickel plating layer having a thickness of, for example, 1 to 5 μm is preferably formed on the surface of the thin metal wire. Further, the wire is desirably a stainless steel wire. When a metal layer made of a metal having a lower melting point than Ni, such as solder, is formed on the surface of the fine wire, the joining temperature can be reduced, and a decrease in the strength of the wire can be prevented.

On the other hand, it is also possible to form a structure in which adjacent wires are integrally joined with a resin. Further, the wire may be composed of at least one of polyester and nylon.

In the case of a mesh material made of a metal material, the method of manufacturing a mesh material for screen printing according to the present invention comprises forming a mesh material by weaving a wire material made of fine metal wires into a net shape, and obtaining the mesh material. In a non-oxidizing atmosphere or in a vacuum in a state where
By heating in a temperature range of up to 1200 ° C., adjacent wires are diffusion-bonded at a portion where the wires intersect.

On the other hand, another method of manufacturing a mesh material for screen printing according to the present invention using a metal wire or a synthetic fiber as a wire material comprises forming a mesh material by weaving a wire material made of a metal wire or a synthetic fiber into a net shape. The obtained mesh material is immersed in a resin solution, pulled up, air-dried, and the dried mesh material is heated to cure the adhered resin, and the adjacent wires are integrally joined by the resin. And

Here, as a wire constituting the mesh material according to the present invention, a wire made of a fine metal wire or a synthetic fiber is used. Stainless steel wire (SUS3
04, SUS316) and brass wire. In particular, a stainless steel wire having excellent corrosion resistance and good diffusion bonding properties is particularly preferable.

In some cases, the mechanical strength of the stainless steel wire tends to decrease depending on the heat treatment temperature (800 to 1200 ° C.) for performing diffusion bonding. Therefore, it is preferable to use an age hardening type metal wire as the thin metal wire, and to further perform an age hardening heat treatment after the diffusion bonding to recover the mechanical strength.

Further, by forming a nickel plating layer having a thickness of 1 to 5 μm on the surface of the fine metal wire, the corrosion resistance of the mesh material is further improved, and the conformability (affinity) between the intersecting wires is improved. Further, it is possible to further increase the bonding strength between the two, and it is possible to further improve the durability and reliability of the mesh material.

The procedure for producing a mesh material from a thin metal wire is specifically as follows. First, wire diameter 20-40μ
200-300 metal fine wire with plain weave
A mesh material having mesh openings is formed, and the mesh material is degreased and washed with a solvent or the like. Next, the obtained mesh material is made of a high melting point metal material such as molybdenum (Mo) or tungsten (W) or alumina (Al).
₂ O ₃ ) and the like, and sandwiched by a plate material formed of a ceramic material. The pressure at this time is preferably about 0.01 to 0.3 MPa.

Next, the mesh material pressed between the plates is pressed in a non-oxidizing atmosphere such as argon (Ar) gas or nitrogen gas (N ₂ ) or in a vacuum of 1.3 × 10 ⁻² Pa or less. 30-180 at ~ 1200 ° C
Heat for about a minute. By this heating operation, adjacent wires are joined together by diffusion bonding at a portion where the wires intersect, and the mesh material for screen printing according to the present invention is manufactured.

It is also possible to use a wire made of synthetic fiber in place of the above-mentioned thin metal wire. Instead of the method of joining adjacent wires by the above-mentioned diffusion bonding, a method of joining wires together by a resin is used. Can also be adopted.

That is, in the case where a mesh material is manufactured using a thin metal wire or a synthetic resin as the wire, a wire such as polyethylene, nylon, or polyester fiber can be used as the synthetic resin.

In the mesh material using the thin metal wire or the synthetic resin wire, adjacent wires may be integrally joined by a resin. As the joining resin,
Although there is no particular limitation, a thermosetting resin such as an epoxy resin, a melamine resin, an unsaturated polyester resin, or a silicone resin can be used, and an epoxy resin is particularly preferable.

A specific procedure for producing a mesh material according to the above-described resin joining method is as follows. First, wire diameter 20
Weave a wire of ~ 40μm with plain weave etc.
A mesh material having openings of about 00 mesh is formed, and the mesh material is degreased and washed with a solvent or the like. Next, the obtained mesh material is immersed (dipped) in an inorganic or organic resin solution, or a resin solution is sprayed (sprayed) on the surface of the mesh material to adhere the resin to the mesh material. As the resin solution, a solution obtained by dissolving an epoxy resin in a solvent such as methyl isobutyl ketone is preferable, and a dipping time of about 10 to 40 seconds is sufficient.

After the adhering resin is naturally dried, the mesh material is put into a thermostat at a temperature of 110 to 130 ° C.
By performing the thermosetting treatment for 0 to 140 minutes, the cured resin film is fixedly formed on the surface of the wire, and the adjacent wires are integrally joined at the intersection of the wires, and the mesh for screen printing according to the present invention. The material is manufactured.

According to the mesh material for screen printing and the method of manufacturing the same according to the above-described structure, adjacent wires are fixedly joined together by diffusion bonding or resin bonding at a portion where wires made of fine metal wires or synthetic fibers intersect. Therefore, even when the mesh material is used for a long period of time, the deformation, elongation, and distortion of the mesh material are small. In particular, the formation of ink pool due to a change in the size of the opening can be effectively prevented, and the durability of the mesh material is excellent. The dimensional accuracy can be maintained for a long time.

[0025]

Next, an embodiment of the present invention will be described.
This will be specifically described with reference to the accompanying drawings and the following embodiments.

Embodiment 1 FIG. 1 is a sectional view showing an embodiment of a mesh material for screen printing according to the present invention, together with a method for producing the same.

That is, the mesh material 1 for screen printing according to the present embodiment is obtained by weaving a stainless steel wire (SUS304) having a wire diameter of 30 μm as a wire 2 in a plain weave structure.
The openings are formed so as to be equivalent to 250 mesh. After the obtained mesh material is degreased and washed,
The molybdenum (Mo) plate material 3 sandwiches it from above and below, and the weight 4 is further placed on the molybdenum (Mo) plate material 3.
Is held so as to receive a predetermined pressing force P (0.05 MPa). In this state, a large number of screen printing mesh materials 1 according to Example 1 were prepared by diffusion bonding of the wires by performing a heat treatment at a temperature of 800 to 1200 ° C. for 120 minutes in a heating furnace adjusted to an N ₂ gas atmosphere. .

The wire material (stainless steel wire) 2 joined to each screen printing mesh material 1 thus prepared was peeled off, and the intersection of the wire materials was observed with a stereoscopic microscope and a scanning electron microscope. Traces (broken sections) welded to the surface of the wire were confirmed, and it was found that the intersections of the wires were integrally joined by the diffusion joining layer 5. Also, despite the pressing operation at the time of manufacturing, no large shift in the aperture size was observed.

After uniformly applying a photosensitive resin film having flexibility to the surface of the mesh material for screen printing according to Example 1, an image is exposed and developed to form a printing screen plate. Screen printing was performed using the plate, and its characteristics were compared and evaluated. That is, a mesh material having the same dimensions as in Example 1 was prepared as Comparative Example 1 except that the diffusion bonding operation was not performed, and the characteristics were compared.

As a result, according to the respective screen printing mesh materials according to the first embodiment, since the adjacent wires are integrally fixed and bonded by diffusion bonding, even when the mesh material is used for a long period of time, the elongation and the distortion of the mesh material can be improved. Was suppressed, and high-precision screen printing could be continued for a long period of time. Incidentally, in each mesh material according to Example 1 as compared with Comparative Example 1 in which the wire was not diffusion-bonded,
It has been found that the usable period can be extended 5.4 to 7.8 times, and the maintenance management of the printing press and the manufacturing efficiency of the electronic device can be greatly improved.

Embodiment 2 FIG. 2 is a sectional view showing another embodiment of the mesh material for screen printing according to the present invention.

That is, the mesh material 1a for screen printing according to this embodiment is formed by weaving a stainless steel wire (SUS304) having a wire diameter of 30 μm (SUS304) as a wire material 2 in a plain weave structure so that the mesh size is equivalent to 250 mesh. Have been. After the obtained mesh material was degreased and washed, it was immersed in a resin solution obtained by diluting an organic epoxy resin 10-fold with methyl isobutyl ketone as a solvent for 30 seconds, pulled up, air-dried, and further dried at a temperature of 12 ° C.
A large number of screen printing mesh members 1a according to Example 2 were prepared by performing a curing process in a thermostat at 0 ° C. for 120 minutes to bond the wires to each other.

As a result of observing the surface of each screen printing mesh material 1a thus prepared with a stereoscopic microscope and a scanning electron microscope, an epoxy resin layer 6 was formed on the surface of the stainless steel wire, and the intersection of the wire was epoxy. It was found that they were integrally joined by the resin layer 6. In addition, despite the immersion operation in the resin solution at the time of production, no large deviation of the aperture size and no clogging of the aperture portion were observed.

After uniformly applying a flexible photosensitive resin film to the surface of the mesh material 1a for screen printing according to Example 2, an image is exposed and developed to form a printing screen plate. Screen printing was performed using a screen plate, and its characteristics were compared and evaluated. That is, a mesh material having the same dimensions as in Example 2 was prepared as Comparative Example 1 except that the resin joining operation was not performed, and the characteristics were compared.

As a result, according to each screen printing mesh material 1a according to the second embodiment, since the adjacent wires are integrally fixed and joined by resin joining, even when the mesh material is used for a long time, the elongation of the mesh material does not increase. It was found that distortion was suppressed and high-precision screen printing could be continued for a long time. Incidentally, in each mesh material according to Example 2 as compared with Comparative Example 1 in which the wire was not diffusion-bonded, the usable period could be extended to 4.2 to 7.5 times, and the printing machine could be used. It has been found that the maintenance management of electronic devices and the production efficiency of electronic devices can be greatly improved.

Example 3 A stainless steel wire (SUS316) having a wire diameter of 30 μm was woven in a plain weave structure, and a thickness of 2 mm was formed on the surface of the obtained mesh material.
A number of screen printing mesh materials according to Example 3 were prepared by performing diffusion bonding under the same conditions as in Example 1 except that a Ni plating layer having a thickness of μm was formed.

A screen plate was similarly prepared from each of the obtained mesh materials, and screen printing was performed using this screen 2 to evaluate its characteristics. As a result, N
It was found that the usable period could be extended by 8 to 26% compared to Example 1 in which the i-plated layer was not formed.

Example 4 A resin bonding treatment was carried out under the same conditions as in Example 2 except that polyester filaments having a wire diameter of 30 μm were woven in a plain weave structure and the openings were formed to be equivalent to 250 mesh. In this way, a number of screen printing mesh materials according to Example 4 were prepared.

A screen plate was prepared from each of the obtained mesh materials in the same manner as in Example 1, and screen printing was performed using the screen plate to evaluate its characteristics. As a result, it was found that the usable period could be extended to 4.2 to 5.1 times as compared with the case where no resin bonding treatment was performed.

[0040]

As described above, according to the screen printing mesh material and the method of manufacturing the same according to the present invention, adjacent wires at the intersections of wires made of fine metal wires or synthetic fibers are bonded by diffusion bonding or resin bonding. Because they are fixedly joined together, even when used for a long period of time, the mesh material is less deformed, stretched and distorted. In particular, the formation of ink pools due to changes in aperture size can be effectively prevented, and the durability is excellent. In addition, the dimensional accuracy of a delicate print image can be maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating the structure of a screen printing mesh material according to an embodiment of the present invention and a method of manufacturing the same.

FIG. 2 is a cross-sectional view showing another embodiment of the mesh material for screen printing according to the present invention.

[Explanation of symbols]

 1,1a Mesh material for screen printing 2 Wire material (SUS304, SUS316) 3 Mo plate material 4 Weight 5 Diffusion bonding layer 6 Resin layer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kozo Yasuda 7-1-1 Nisshin-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term (reference) 2C035 AA01 FF25 FF26 2H114 AB05 DA04 DA26 DA55 DA56 DA72 EA03 GA11 GA36 GA38 5E343 BB72 DD03 FF02 FF14 GG08

Claims (8)

[Claims] 1. A screen printing mesh comprising a mesh material formed by weaving a wire made of a thin metal wire or a synthetic fiber in a net shape, and adjacent wires are integrally joined at a portion where the wires intersect. Wood. 2. The screen printing mesh material according to claim 1, wherein the wire is made of a thin metal wire, and adjacent wires are integrally joined by diffusion bonding. 3. The screen printing mesh material according to claim 1, wherein the wire is made of a thin metal wire, and a nickel plating layer having a thickness of 1 to 5 μm is formed on the surface of the thin metal wire. 4. The screen printing mesh material according to claim 1, wherein the wire material is a stainless steel wire. 5. The screen printing mesh material according to claim 1, wherein adjacent wires are integrally joined by a resin. 6. The screen printing mesh material according to claim 1, wherein the wire is made of at least one of polyester and nylon. 7. A mesh material is formed by weaving a wire made of a thin metal wire into a net shape, and the obtained mesh material is pressed in a non-oxidizing atmosphere or in a vacuum in a state of being uniformly pressed.
A method for producing a mesh material for screen printing, wherein adjacent wires are diffused and joined at a portion where the wires intersect by heating in a temperature range of 00 to 1200 ° C. 8. A mesh material is formed by weaving a wire made of a thin metal wire or a synthetic fiber into a net shape, immersing the obtained mesh material in a resin solution, pulling it up, air-drying, and heating the dried mesh material. A method of manufacturing a mesh material for screen printing, wherein the adhering resin is cured by bonding, and adjacent wires are integrally joined with the resin.