1, coated with corrosion-resistant photosensitive ink

 

First select a 200 mesh screen. The screen screen must be clean and medium in size. Fix it firmly on the professional manual screen printing platform shelf, place the stainless steel plate in the center of the screen screen, and keep the edge of the stainless steel plate and the corresponding screen mesh inner frame at a distance of about 6 cm. Near and too far are not suitable. After being placed in the proper position, use a transparent tape to stick it around. When you stick it, be sure to carefully press it with your hand, so that no bubbles will be left between the transparent tape and the screen to allow them to fully contact. The photosensitive ink is not applied to the outside of the stainless steel plate. The portion of the non-stick transparent tape in the middle coincides with the size of the stainless steel plate, so that the position is accurate when the corrosion-resistant photosensitive ink is applied. After all the glue is applied, the surface is cleaned again to keep the screen surface of the screen clean.

 

We choose a 1 cm thick pad and place it behind the screen screen and the back panel of the screen printing platform. This distance between them is the mesh distance. Generally, it is better to make the screen screen tension and the mesh distance small, so that the ink can be bounced in time after the ink is printed.

 

Corrosion-resistant photographic inks should be adjusted for consistency before use. In winter, the inks are easily solidified. You can put it in the oven for a while. The temperature of the oven is set at 88 degrees, let it be automatically controlled, take it out after 5 minutes, stir well, no air bubbles, and use it like this.

 

Prepare a rubber scraper with a beveled surface that is elastic, flat, unnotched, and clean.

 

Put a proper amount of photosensitive ink on the surface of the screen screen to form a strip. You can start scraping with the scraper. When scraping, the force should be appropriate and the speed should be just right. After 1 or 2 times. , the screen screen is opened, if the thickness of the photosensitive ink printed on the stainless steel plate is very uniform, you can hold it on the opposite side of the hand and take it out, taking care not to stain the surface coated with the photosensitive ink.

 

It should be noted that this situation is often encountered. After 2 times of shaving, the effect is still not good, then you have to give up. Otherwise the ink is too thick and it will not work.

 

In a warm water of about 30 degrees, add an appropriate amount of industrially weakly alkaline sodium carbonate, the ratio is about 20:1, stir evenly and put into the photosensitive ink without evenly coating the stainless steel plate, the coating will soon leave the stainless steel surface. Then wipe the photosensitive ink thoroughly with a clean cloth, then rinse with water, blow dry with a hair dryer, and then reprint it.

 

2, drying

 

The stainless steel plate coated with the photosensitive ink was placed in an oven at a temperature of 88 degrees and a baking time of 15 to 20 minutes. After drying, adjust the hair dryer to the cold air file to cool the stainless steel plate, and let it cool naturally.

 

Second, the sign etching pre-treatment, image transfer

 

A. Determine the type

 

The model design of the signage is the premise of the signboard production. It requires the engineer to design the drawings, which is not only suitable for typesetting, but also suitable for the production of the subsequent processes.

 

We use the title of “Foshan Xin Hengli Corrosion Machinery Factory” to make a silver sign with sand shading and a gold sign with laser shading. In order to understand the production process more clearly, we will process the two signs synchronously.

 

B. Determine the size

 

Open the coreldraw drawing software and use the rectangular tool to draw the outermost outline of the sign according to the size required by the customer. The setting length is 184 mm and the width is 133 mm. Use the same method to draw another one, input the appropriate size, adjust the position, and drag the pre-selected decorative lace to the appropriate position in the rectangular box.

 

C. Select the shading

 

The shading is applied a lot in the sign. We use two kinds of shading, one is the laser shading and the other is the sand shading. If the pattern of the shading is too large, you can drag the shading to the appropriate position on the screen before deleting the excess part.

 

D. Determine the content

 

The content of the sign is relatively simple. Put the company logo in the upper left corner, adjust the size, and then input the text. The font should be solemn, clear and beautiful, accurate and easy to identify. After the typesetting is completed, check the overall effect. The golden signage of this laser shading. It's finished.

 

Just replace the laser shading with a sand shading, which becomes a silver sign for the sand shading.

 

(2) Out of the film

 

The film is output to the professional film output company, which is obtained by laser printing, exposure, and fixing. The thing we have to do is to take the film back and check it carefully to see if it is consistent with the original, and whether the film is clean and the edges are very clear.

 

(3) Cutting

 

1, choose the plate

 

The metal plates for making signs are: copper plates, stainless steel plates, titanium plates, etc. Each metal plate has different characteristics, and the appropriate plate can be selected for different styles of the sign. Stainless steel has the advantage of rust resistance and is a commonly used plate for making metal signs. Now we choose a thickness of 0.3 mm.

 

2, cutting and trimming

 

According to the designed size, on the selected stainless steel plate, put a margin of a few millimeters on each side, make the mark points, and cut it. The cut stainless steel plate often has burrs on all four sides, and it should be smashed with a file. After touching it, touch it with your hand and the edge is smooth, you can.

 

3, remove oil stains

 

After soaking the stainless steel plate in clean water, put some washing spirit on the surface, scrub the oil on the surface of the stainless steel plate with a clean cloth for three to four times, then rinse with water, and clean the surface of the stainless steel plate. Will affect the smooth progress of the subsequent process.

 

4, blow dry

 

Dry the water droplets on the surface of the cleaned stainless steel plate with a hair dryer, leaving no water stains.

 

Third, the sign etching machine corrosion

 

The production of stainless steel plate signs is mainly done by the etching process of the etching machine. Its etching principle is:

 

This represents the thickness of the stainless steel plate. We first apply a layer of corrosion-resistant photosensitive ink on its surface, put a film on it, expose it with ultraviolet light, and pass the ultraviolet light on the transparent part of the film. It will react with the photosensitive ink to form a weakly alkaline coating. The photosensitive ink under the black part of the film is not resistant to weak alkali. Take the film of the film and soak the stainless steel plate in the weakly alkaline sodium carbonate solution. The coating that is not resistant to the weak alkali part will chemically react with the sodium carbonate solution and fall off. The metal in these places is bare, stainless steel plate The pattern will appear on it. Put a layer of anti-corrosion protective film on the opposite side, put it into the etching machine, and wash the exposed surface of the stainless steel plate with ferric chloride solution. The ferric ions in the ferric chloride solution will be quickly oxidized and used. eclipse

 

 

Engraving this part of the stainless steel plate, we can clearly see with macro shooting, the local stainless steel plate is corroded by the etching machine.