JPS624234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a cylindrical nickel screen used for printing on cloth or paper with improved porosity.

The manufacturing process for cylindrical nickel screens used for printing on fabric or paper begins with mill engraving of a mother roll.

In other words, 60 meshes, usually in the shape of a tortoise shell, are placed on the surface of a copper or iron roll polished to a predetermined size.
Performed 80 mesh and 100 mesh mill carvings,
Finish by performing surface treatments such as degreasing, acid treatment, polishing, and buffing.

Then, chrome plating of approximately 10μ is applied to the mill-engraved roll surface. This makes it possible to peel off the nickel screen without sticking to it when the roll surface is plated with nickel, and also protects the mother roll surface from corrosion.
Necessary for wear resistance.

Furthermore, after applying an electrically insulating paint such as resin to the chrome-plated mother roll surface and drying it, use a doctor to remove the excess paint adhering to the surface and fill only the recesses formed by the mill engraving with the paint. .

The mother roll made as described above is immersed in an electrolytic bath for nickel plating (generally a nickel sulfamic acid bath) to perform nickel plating.
This nickel plating layer is removed from the mother roll to obtain a cylindrical nickel screen.

General cylindrical nickel screens are
60 mesh screen, thickness 95±5μ, pore diameter 160
±5μ, opening rate 17%, 80 mesh screen thickness 95±5μ, pore diameter 100±5μ, pore size 13%, 100 mesh screen thickness 80±5μ, pore diameter 70±5μ,
Manufactured with a porosity of 9%.

However, the fate of screens made by electrodeposition is that the thickness of the electrodeposition is T, as shown in Figure 1.
As the thickness increases from t to t, the electrodeposited metal layer grows to cover the non-conductive resin P filling the pores of the mother roll with a diameter D, and the pore diameter decreases from D to d.

When the holes become small in this way, the ink or dye does not come out easily during printing, the dyeability is reduced, and the pattern or line pattern formed by the holes is cut. To prevent this, it is necessary to increase the printing doctor pressure and increase the squeezing of ink or dye, which has various adverse effects on the print.

This invention proposes a manufacturing method for obtaining a nickel screen with a high porosity that eliminates such drawbacks.The effect is to improve the dyeing property and to produce clear prints by improving the flow of ink or dye. It's about what you get.

In this invention, a cylindrical nickel screen made by mill engraving the surface and electrodepositing and punching out the recesses resulting from the engraving using a mother roll filled with non-conductive resin is held almost horizontally and rotated, while the inside of the screen is rotated. Etching is completed by spraying etching liquid uniformly over the entire inner peripheral surface of the cylinder from a spray pipe having a large number of spray holes extending through the cylinder.

That is, this invention creates a screen with a good porosity by etching a cylindrical nickel screen made by electrodeposition from the inner circumferential surface by preferentially etching the pore diameter portion rather than etching in the thickness direction of the screen. It is characterized by

Therefore, since the screen is etched in the thickness direction and its thickness becomes thinner, it is desirable that the screen used in this invention be electrodeposited so that it is slightly thicker than a normal screen.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows an example of an apparatus for carrying out the present invention, in which an etching tank 5 is mounted on a frame 4 housing a washing tank 1, a degreasing tank 2, and an etching tank 3. The etching tank 5 has a top plate and one end plate (on the left side in the drawing) that can be removed or opened and closed, and a cylindrical nickel screen 6 is placed at the bottom of the tank, and a pair of drive rollers 7 rotate the screen.
7 are arranged opposite each other and are configured to be rotated in the same direction by a motor 8. Further, in the upper part of the tank, there is provided an injection pipe 10 which is supported by support rollers 9, 9 provided on both end plates and vibrates slightly in the longitudinal direction of the tank. This injection pipe 10
As shown in the drawing, a large number of injection holes 11 are arranged diagonally downward, and a vibration generating device 12 consisting of a cylinder or a solenoid is connected to generate slight vibrations. And drive rollers 7, 7
A water washing pipe 13 is provided above the cylindrical nickel screen 6 placed above. This flush pipe 1
Numeral 3 is provided with a large number of injection holes similar to the injection pipe 10, and is used to wash the screen with water from the outer circumferential surface after it has been degreased or etched.

The water tank 1 and the washing pipe 13, the degreasing liquid tank 2 and the injection pipe 10, and the etching liquid tank 3 and the injection pipe 10 are connected by pipes having pumps 14, 15, and 16 so that water and liquid can be supplied, Also, piping will be provided so that the degreasing liquid and etching liquid can be recovered after use.

A cylindrical nickel screen whose surface is mill-engraved and a nickel plating layer formed by electrodeposition on the circumferential surface of the mother roll filled with a non-conductive resin in the recesses created by the engraving is removed is used in the above-mentioned apparatus. Remove the end plate of the etching tank 6, insert it into the tank, place it on the drive rollers 7, 7, put the end plates together again, and support the injection tube 10 on the support rollers 9, 9 so that it can vibrate slightly. Then, put the washing water, degreasing liquid, and etching liquid into each tank to complete the preparation.

First, start the motor 8 and rotate the cylindrical nickel screen through the drive rollers 7, 7 at a rotation speed of 10~
While rotating at 20 rpm, as a pre-degreasing process, the pump 14 is operated to uniformly wet the entire surface of the screen, and the pump 15 is operated to spray the degreasing liquid heated to approximately 40°C from the injection hole of the injection pipe 10 onto the inner peripheral surface of the screen. After degreasing by spraying for about 5 to 10 minutes, the pump 14 is operated to spray water onto the outer circumferential surface of the screen from the washing pipe 13 for washing, and then the pump 16 is operated to spray the etching solution from the spray pipe 10 onto the inner circumferential surface of the screen. Etching is performed by spraying on At this time, the vibration generator 12 is moved to slightly vibrate the injection tube 10 in the axial direction so that the etching liquid is uniformly sprayed over the entire screen. Then, once the etching is finished, the water washing device is operated again to perform water washing and finish.

The etching solution used is basically a mixed solution of 10 parts of nitric acid, 20 parts of hydrogen peroxide, and 70 parts of water.

According to the implementation of this invention, since etching of the screen is carried out with priority given to the pore diameter portion, the pore diameter is enlarged without damaging the wall thickness of the screen, and the pore diameter size is increased by 40 to 60% compared to the conventional screen, and the pore size is significantly increased. The rate has been improved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the change in pore diameter as the nickel plating layer electrodeposited on the mother roll becomes thicker, and Fig. 2 is a longitudinal sectional view showing an example of an apparatus for carrying out the method of the present invention. , and FIG. 3 is a sectional view of the inside of the etching bath. In the figure, 1... Water tank for washing, 2... Degreasing liquid tank, 3... Etching liquid tank, 4... Frame, 5... Etching tank, 6
...Cylindrical nickel screen, 7...Drive roller, 8
...Motor, 9...Support roller, 10...Ejection pipe, 11
...Injection hole, 12...Vibration generator, 13...Water pipe,
14, 15, 16...pump.

Claims (1)

[Claims] 1. A cylindrical nickel screen formed by mill-engraving the surface and electrodepositing the carved recesses on a mother roll filled with non-conductive resin is held almost horizontally and rotated, while a large number of injection holes are penetrated into the screen. 1. A method for manufacturing a cylindrical nickel screen with a good porosity, characterized in that etching liquid is uniformly injected over the entire inner circumferential surface of the cylinder from an injection pipe having a jet tube, thereby preferentially etching the pore diameter portion to increase the porosity.