JPS621830B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing all rotary and flat screens, including mesh screens containing images for printing, by the plating method, and is based on the invention of the earlier patent application No. 59395/1983. This is a supplement to the above. To be more specific, regarding a method of manufacturing a printing screen with a good porosity by performing plating in multiple steps, the method involves applying a non-conductive resin and scraping off the non-conductive resin from the convex portions of the plating metal. The present invention relates to a method in which the non-conductive resin on the plated metal protrusion is simultaneously pushed into the screen mesh hole using a doctor or a flat metal plate and scraped off at the same time using a doctor.

The method of the invention of Japanese Patent Application No. 52-59395 mentioned above is that when a screen (including a mesh screen with an image) is made by a plating method (including an electroforming method), 1.
Rather than obtaining the required thickness in one plating process, the required thickness is divided into multiple plating steps, a non-conductive resin is evenly applied between the platings, and the undried metal is plated in multiple steps. During this state, the resin is brought into contact with a receptive non-metal, the non-conductive resin on the protrusions of the plated metal is removed, the side walls and other parts of the plated metal are coated with a non-conductive resin, and after drying, the plating process begins. The purpose is to manufacture a screen with nearly vertical openings and a good porosity ratio.

The outline of the steps of this method of the invention of the prior application is as follows.

After filling the metal surface with resin to create a non-conductive part, for example, when making a nickel screen, the first nickel plating is performed.

Next, apply the resin liquid evenly over the entire surface. This state diagram is shown in the attached FIG. 1. 1 is a master roll, 2 is a non-conductive resin, and 3 is a plating metal. The application method is spray application,
Any method such as doctor coating or roll coating may be used.

If a roller or flat plate made of a non-metal, such as rubber, which has good ink retention is rolled on the resin-coated surface at a constant pressure while it is not yet solidified, that is, after application and before the crown dries, the result shown in Fig. 2 is obtained. As a result, only the resin on the plated metal protrusions is transferred to a non-metal roller etc. with good ink retention. 5 indicates a rubber roller.

Next, it is dried and then plated again in a plating bath.

The above steps are repeated to obtain a screen with a predetermined thickness.

Furthermore, almost all kinds of non-conductive resins are used in the method of the prior application, and those having a boiling point range of 100 to 300°C are used as solvents.

The present invention will be explained below while comparing it with the invention of the earlier Japanese Patent Application No. 52-59395.

This will be explained based on the process of the prior invention. The steps are exactly the same in the method of the present invention. As for the process, that is, the coating method, in the case of the previous application, spray coating, doctor coating, roll coating, etc. are mentioned, but in all cases, there is a drawback that the coating must be applied uniformly over the entire surface. However, in the method of the present invention, non-uniformity is acceptable, and as a result, a dipping method can also be used as a coating method. Also, this coating step and the next step, the step of removing the resin from the plated metal protrusions, can be performed at the same time (when performed at the same time, both steps are limited to cases where a normal doctor is used. In other words, a metal plate-like doctor is used) (except in case of use). The process is largely different between the prior invention and the method of the present invention, and the feature of the method of the present invention lies in this step. That is, in the prior invention, after applying the resin,
The ink is transferred to the non-metallic roll or flat plate by pressurizing and contacting a well-inked non-metallic roll or a non-metallic flat plate with the resin coated on the plated metal convex part while it is not dry. to expose.
Therefore, it was necessary to apply the resin uniformly over the entire surface.

In the method of the present invention, a non-metallic roll or flat plate with good ink is used as a substitute, and the resin on the plated metal convex portions, which is applied using a metal or non-metallic doctor or a metal flat plate while the resin is in an unsolidified state, is transferred by transfer. Instead of removing and exposing the metal protrusions, the metal protrusions are exposed by scraping them or pushing them into the screen mesh holes and scraping off some of the excess resin at the same time. Therefore, even if the resin is applied unevenly, it will not be a problem in the end. To explain in more detail, this process can be roughly divided into the following two steps. When removing the non-conductive resin from the plated metal protrusion using a doctor: The doctor used in this process is similar to the doctor for ink scraping used in gravure printing, etc., and is made of steel. , stainless steel, nylon, and other metal and non-metal doctors can be used. For example, those made of the following materials can be used.

Metal materials for doctors Meitetsu Steel Polished steel strip (JIS G3308) SPMA, SPMB, SPMC, SPMD, SPME Special polished steel strip (JIS G3311) SK2, 3, 4, 5, 6, 7, SKS5A,
SKS5B Stainless Steel (JIS G4303~4309) SUS21, 22, 23, 24, 27, 28, 29, 32, 33,
35, 36, 37, 38, 39, 40, 41, 42, 43, 44 Spring steel (JIS G4801) SUP3, 4, 6, 7, 9, 10, 11 Non-ferrous Phosphor bronze plate (JIS H3731) PBP1-O , PBP1−1/4H, PBP1−1/2H,
PBP1-H, PBP1-EH PBP2-O, PBP2-1/4H, PBP2-1/2H,
PBP2-H, PBP2-EH, PBP3-O, PBP3-1/4H, PBP3-1/2H,
PBP3-H, PBP3-EH, German silver plate for springs (JIS H3702) NSS-1/2H, NSS-H, NSS-EH, NSS-
SH Name of non-metal for doctor 6 nylon 66 nylon Urea resin Lime acid resin Bakelite In order to carry out the method of this application, the thickness of the cutting edge is 0.1
The width and length of the blade can be freely selected as long as it is ~0.5m/m, and the way of applying the doctor can range from parallel to almost vertical as shown in 6 ¹ and 6 ² in Figure 3. You can choose freely. Furthermore, regarding the angle of application of the doctor, see 6 in Figure 4.
You can freely choose as shown in ³ , 6 ⁴ , and 6 ⁵ . In addition, in the method of removing the resin from the plated metal protrusions using a doctor, the process can be performed at the same time as the previous step of applying the resin using the doctor. That is, as long as an ordinary doctor is used in the two steps of applying the resin and exposing the metal protrusion, it is possible to perform the two steps simultaneously in one step.

The resin must be in an unsolidified state during the two steps of application and removal. It is a feature of the prior invention that the material is removed in this undried, unsolidified state, and a feature of the present invention is that this method is partially modified. Therefore, in the prior invention, the boiling point of the resin solvent was set at 100 to 300°C, but in the method of the present invention, the two steps can be combined into one and performed simultaneously using a doctor, so the boiling point range is further expanded. It is now possible to use alcohol, xylol, and other substances with temperatures below 100℃. The fact that a solvent with a low boiling point can be used means that the subsequent drying step can be carried out instantaneously or can be omitted, which is of great significance to the method of the present invention.

In the method of the present invention, the doctor may be of the usual type used for coating paint, or may be of a flat metal type. When removing the resin from the plated metal protrusions using a flat metal doctor: In this case, the resin may be applied by any of the methods described above. After applying the resin and while it is still in an unsolidified state, a flat metal plate is placed on top of it as shown in Figure 5, and pressure is applied strongly with a rubber roll, etc., thereby pushing the resin on the convex part of the plating metal into the screen mesh hole and partially forming the metal plate. It is removed with a flat plate. Therefore, the thickness of the metal flat plate must be 0.1 to 1 m/m. The flat plate can also be used in the form of a belt.

In the method of the prior invention, a solvent such as MEK is used to wipe off the ink that has adhered to the surface of the roll or flat plate, which is performed in a separate process to adhere ink to a non-metallic roll or flat plate. However, the method of the present invention, which uses a flat metal plate, can completely overcome the drawbacks of the method of the prior invention.

The subsequent steps are the same as the method of the prior invention.

The method of the present invention will be described in more detail below with reference to non-limiting examples.

Example 1 80 mm on a metal surface with a circumference of 640 m/m and a surface length of 400 m/m.
After plating the surface of the master roll, which is packed with epoxy resin to a line per inch, in a nickel sulfamate bath to a thickness of 40 microns, it is removed from the plating bath, dried, and printed with printing ink TG70 (manufactured by Takahashi Ink Manufacturing). Spread it with a rubber roller and apply it evenly on the master roll surface. Next, before the ink dries, the shower hardness is 90, the thickness is 0.15m/m, and the width is
A steel doctor with a blade length of 100 m/m and a blade length of 6.0 m/m is brought into contact with the ink-coated master roll, and the pressure between the doctor and master roll is set to 2 kg/m.
In ^addition , the contact angle between the doctor and the master roll is as shown in Figure 6. While the master roll is rotating at a rotational speed of 10 rpm, the doctor is fed uniformly from the right end to the left end of the master roll at a speed of 1 m/min. The ink on the plating metal protrusions was scraped off at the same time as it was pushed in. Thereafter, precipitated lime carbonate was dissolved in water on a sponge, applied with resin, and after washing with water, a 5% aqueous nitric acid solution was applied and plated again in a nickel plating bath to a thickness of 40 microns. Result 1
The pore diameter of 80 micron pores can be changed to 160 micron by two-part plating, and it is possible to create a screen that does not reduce the pore diameter by plating. did it. Therefore, a high mesh screen could be easily produced and the purpose of the method of the present invention could be fully achieved.

Example 2 Plating was carried out in the same manner as in Example 1, the plating process was divided into three parts, and a 20% solution of novolac type phenolic resin in isopropyl alcohol was applied as a coating solution by a spray method, and the shower hardness was determined.
40゜, thickness 0.5m/m, width 80m/m, cutting edge length 6.0
m/m, using a 66 nylon doctor, the doctor load is 2Kg/cm ² The contact angle of the doctor is (6th
As shown in the figure), while rotating the master roll at a speed of 100 rpm, feed the doctor at a uniform speed (1 m/min) from the right end to the left end, remove the resin from the convex part of the plating metal, and then repeat the same operation to re-plate. I did this. Pore diameter after 2 coatings and 3 plating
200 microns, and the purpose of this method was more fully achieved than in Example 1.

Example 3 A stainless steel plate (300 m/m x 300 m/m) was coated with photosensitive resin (7% of TPR201 polysilicate vinyl resin).
After coating with ethyl cellosolve acetate solution (manufactured by Tokyo Ohka) and printing a mesh image, it was developed and washed with water to a thickness of 20 mm in the same plating bath as in Example 1.
Nickel plating was performed to obtain a micron size, and the surface was then removed from the plating bath and dried. Next, 20% polysilicate vinyl resin was dissolved in ethyl cellosolve acetate, and a nickel-plated stainless steel plate was placed in the solution and pulled out. Next, width 400m/
Contact it with a stainless steel endless belt with a thickness of 0.5 m/m and a length of 4 m as shown in Figure 7. At this time, the contact pressure was 6 kg/cm ² and the endless belt rotated at a rotational speed of 30 m/min while pressurizing the stainless steel plate. At that time, the resin applied to the plating convex portions of the stainless steel plate was pushed into the plating concave portions, and the resin on the convex portions was removed.

Thereafter, degreasing and activation treatments were performed in the same manner as in Example 1, and plating of 20 microns was performed in a plating bath. As a result of 3 coatings and 4 platings, a screen with a pore diameter of 220 microns was obtained, fully satisfying the purpose of this method.

Example 4 A stainless steel plate (300 m/m x 300 m/m) was coated with photosensitive resin (7% of TPR201 polysilicate vinyl resin).
After coating with ethyl cellosolve acetate solution (manufactured by Tokyo Ohka) and printing a mesh image, it was developed and washed with water to a thickness of 20 mm in the same plating bath as in Example 1.
Nickel plating was performed to obtain a micron size, and the surface was then removed from the plating bath and dried. Next, using the same doctor as in Example 1, under the same conditions as in Example 1, the same ink as in Example 1 was pushed into the holes and scraped off at the same time, and then degreased and activated as in Example 1. After treatment, 20 minutes in the bath
Performed micron plating. As a result of embedding three times and plating four times, a screen with a pore diameter of 220 microns was obtained, fully satisfying the purpose of this method.

Example 5 Using a master roll in which a 150/in mesh was made with the same size as in Example 1 and epoxy resin (Araldite, manufactured by Ciba Geigy) was embedded in the recesses, the same nickel sulfamic acid plating as in Example 1 was carried out. Nickel plating thickness 80μ in one bath
When plating was performed to achieve this, the holes completely disappeared. Next, after plating the first time to a thickness of 20μ, resin was poured into the holes in the same manner as in Example 1, and then plating was performed to a thickness of 30μ, and the same method was applied again. Then resin was poured into the hole and plated to a thickness of 30μ. Nickel thickness is 80μ by plating 3 times
As a result, we were able to obtain a nickel sleeve with a pore diameter of 60μ. Next, it was set in a vertical coating machine and coated with a photosensitive resin liquid (polymethacrylate resin) to a thickness of 30 μm. next
Print a line drawing with a line width of 200μ, run it on a rotary screen printer, use water-based acrylic ink, and squeegee conditions (stainless steel t=0.5,
When printed on printing paper under the conditions of a blade edge length of 30 m/m, a staking pressure of 3 Kg/cm ² ), and a printing speed of 40 m/min, a beautiful line drawing could be reproduced (printed). Line drawings with this line width were completely impossible using conventional methods.

Example 6 Produced in the same manner as in Example 4. 150/in
The sleeve was fitted onto an iron roll with a circumference of 600 m/m and a length of 1500 m/m, a film-like photosensitive resin (Kodack Liston film) having a thickness of 30 μm was wrapped around it, and the sleeve was continuously rolled using an iron heated to 160°C. It was heat-pressed.

Thereafter, an image was produced in the same manner as in Example 4, and when printing was performed using the same ink and under the same conditions as in Example 4, a fine line with a line width of 200 μm could be printed sharply.

Example 7 A stainless steel roll (Japanese Industrial Standard SUS-27) with a circumference of 640 m/m and a surface length of 400 m/m was coated with a photosensitive resin (polyvinyl cinnamate) to a film thickness of 5 μm. Next, a negative line drawing with a line width of 200 μm and a mesh size of 150/in was printed, and then developed with a specified developer mainly containing xylol to expose the unexposed portions of the metal surface.
After degreasing the exposed metal parts and washing with water, the parts were plated to a nickel thickness of 40 μm in a nickel sulfamic acid bath. After taking it out of the bathtub, washing it with water, and drying it, buteral and cellosolve acetate were spread out using a regular rubber roller and applied uniformly to the entire surface of the roll. Next, before the ink dries, remove the resin on the plating protrusions in the same manner as in Example 1, then dry the stainless steel roll with hot air, degrease it with a 2% alkaline aqueous solution, wash it with water, and then take a nickel plating bath again. Inside, plating was further made to a plating thickness of 20μ, and the coating was applied again, and finally, an additional plating of 20μ was made to a total plating thickness of 80μ. Next, after eluting the applied ink using MEK, the plated nickel part was pulled out from the stainless steel roll and examined, and the pore diameter was 60μ. Next, after attaching the end ring, it was printed using a rotary screen printer. the result
I was able to reproduce a 200μ line drawing.

Example 8 Photosensitive resin (product name
Kopierlack PK, 13 WIESBADEN−BIEBRICH
spray coated with 5μ film thickness
And so.

Next, after printing a net negative having a 150/in gradation, it was developed with approximately 5% caustic soda (NaOH) to expose the unexposed metal surface.

After degreasing the exposed metal parts and washing with water, it was plated to a nickel thickness of 40 μm in a nickel sulfamic acid bath.

After taking it out of the plating bath, washing it with water, and drying it, printing ink TG-70 (manufactured by Takahashi Ink) was spread on the entire surface of the roll using a regular rubber roller.

Next, before the ink dried, the resin on the plated metal protrusions was removed in the same manner as in Example 2.

Next, after drying the stainless steel roll with hot air,
Degreasing liquid (product name A-clean manufactured by Okuno Pharmaceutical)
After degreasing with
It was plated to a plating thickness of 20μ, then ink was applied again, and finally a plating of 20μ was made to a total plating thickness of 80μ.

Next, after eluting the applied ink using MEK and eluting the photosensitive resin (trade name: Kopierlack) with 10% caustic soda (NaOH), the plated nickel part was pulled out from the stainless steel roll and examined. , solid area hole diameter 60μ, highlight area hole diameter
It was 10μ. Next, the end ring was attached and printed on a rotary screen printer.

As a result, we were able to reproduce gradations that were previously unobtainable.

Example 9 Diameter 60 as application to high mesh filter
A circular iron roll with a diameter of 120 m/m and a height of 120 m/m was made, the surface of which was polished, and then copper plated to a thickness of 200 μm in a copper cyanide plating bath. Next, the copper surface was polished to a mirror finish, and then a 150-mesh square hole was drilled using the engraving method, and then the entire surface was plated with chrome to a thickness of 5μ in a chrome plating bath. After chrome plating, thoroughly wash with water and dry, fill the recesses with epoxy resin and polish to make it smooth. The completed matrix was nickel-metalized three times in the same manner as in Example 1, 30μ, 25μ, 25μ.
By applying resin between each layer in the same manner as in the examples, it was determined that the filter could be used satisfactorily as a filter, and experiments were repeated to apply it to a filter.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing a state in which resin liquid is applied to the entire surface of the plating using the method of Japanese Patent Application No. 52-59395. FIG. 2 is a schematic sectional view showing a situation in which only the resin on the plated metal convex portions is transferred to a non-metallic roller or the like with good ink retention using the method of Japanese Patent Application No. 52-59395. Figure 3 is a schematic sectional view illustrating the angle of application of the doctor;
The figure is also a schematic sectional view in a direction perpendicular to FIG. 3, illustrating the angle of application of the doctor. FIGS. 5A and 5B are schematic cross-sectional views showing the relative positions of the master roll and the doctor (Embodiment 1). FIGS. 6A and 6B are also schematic sectional views showing the relative positions of the master roll and the doctor (Embodiment 2). FIG. 7 is a schematic cross-sectional view showing a situation in which a stainless steel endless belt is brought into contact with a nickel-plated stainless steel plate, and the resin applied to the plating convex portion of the stainless steel plate is pushed into the plating concave portion and removed.
FIG. 8 is an explanatory diagram showing the operation of FIG. 7.

Claims (1)

[Claims] 1. When manufacturing a printing screen by the plating method,
To obtain the required thickness of plating metal, plate the metal in multiple steps, and between the platings, apply a non-conductive resin to the plating surface with a roll coater, spray, doctor, etc., or directly apply a screen. The non-conductive resin is immersed in a non-conductive resin liquid to adhere the non-conductive resin to the plating surface, and while the non-conductive resin is in an unsolidified state, it is placed on the convex part of the plating metal with a metal or non-metallic doctor. A method for manufacturing a screen, comprising the step of scraping off only the non-conductive resin or pushing it into the screen mesh holes, and at the same time exposing the scraped metal surface. 2 The metal or non-metal doctor is the same as the doctor for applying the non-conductive resin, and the process of applying and scraping off the non-conductive resin or pushing it into the screen mesh hole and scraping it off at the same time is the same. The method according to claim 1, which is carried out simultaneously by two doctors. 3. The method according to claim 1, wherein applying the non-conductive resin and scraping off the non-conductive resin, or pushing the non-conductive resin into the screen mesh hole and scraping it off at the same time, are carried out using separate doctors. 4. The method according to claim 1, wherein the doctor used in the step of scraping off the non-conductive resin or pushing it into the screen mesh hole and scraping it off at the same time is a flat metal plate. 5. The method according to claim 4, wherein the metal flat plate serving as a doctor used in the step of scraping off the non-conductive resin or pushing it into the screen mesh hole and scraping it off at the same time is belt-shaped.