Glass special screen printing process

※ Glass etching screen printing

For a long time, the etched decoration of glass products is to heat-coat the wax layer and other reinforcement materials on the glass surface as a resist layer. Then the patterns on the coating are etched with needles, knives, etc. to expose the glass surface, and then This part is etched with hydrogen fluoride. This process has continued to be used by manufacturers, but its processing methods are time-consuming, laborious, and inefficient.

The silk screen etching process makes the etching and decoration of glass products simple, time-saving, and labor-saving. Glass etching screen printing, hot and cold printing two methods.

Thermoplastic etching screen printing is the preparation of paraffin wax, asphalt, stearic acid and other adhesives, adding a small amount of anti-corrosion powder modulation anti-corrosion printing materials, through the hot-printed silk screen, according to the design of the pattern, the printing material scraped To the glass surface, the formation of a resist film. The part of the resist film exposed to glass is the pattern that needs to be etched. Etching is performed with fluorfluoric acid. After etching, the resist printed on the glass is rinsed with boiling water.

Glass stencil etching can also be performed using cold stamping methods. Anti-corrosion printing material can use special asphalt paint and anti-corrosion powder, and can also buy commercially available ink-resistant ink. After the printing is completed, the hydrofluoric acid corrosion can be performed until the resist film is completely dried.

Hot stamping is suitable for the etching of continuous, tetragonal pattern patterns on two sides, and cold stamping is applied to the etching of individual patterns.

※ glass ice silk screen printing

Ice flower commonly known as orange peel, it is actually a very small low-melting glass particles. The fine glass particles have high lead content, and are colored and colorless. The color hue can be red, yellow, blue, green, white, etc., and can also be used to prepare intermediate shades.

Screen printing ice decoration, elegant and elegant, mostly used for architectural glass decoration and art glass decoration, such as advanced glassware, lamps and other decoration.

Screen printing glass ice decoration, first in the glass surface silk screen color or colorless glass flux layer (flux), and then sprinkle ice glass particles on the layer of glass flux. By sintering at 500 to 590° C., the flux layer and the ice particle layer on the surface of the glass are eutecticized to produce an embossed effect. If the screen is printed with a colored flux on the glass, and the ice flower is transparent, through the high-temperature eutectic, the flux layer of the glass ice pattern is faded, and a colored, bulging transparent relief pattern is formed on the glass surface.

Frosted screen printing of glass A small area of ​​glass enamel powder is baked at a high temperature of 580 to 600° C., so that the glass enamel coating is melted on the glass surface, and a decoration method having different colors from the glass body is shown. Adhesion glass glaze powder can be brushed with a brush, roller roller can also be coated.

Through the screen printing process, you can get a frosted surface of the floor pattern. The method is: on the surface of a glass product, a pattern of a pattern formed by a flux is screen printed. After the pattern pattern to be printed is dried, the frosted surface is processed again. Then, after baking at high temperature, the frosted surface without pattern pattern will be melted on the glass surface, and the surface of the screen printing pattern will not be melted on the glass surface due to the effect of the fluxing agent. After baking, the transparent floor pattern is revealed through the translucent sand surface, forming a special decorative effect.

Frosted screen printing flux agent, composed of ferric oxide, talcum powder, clay, etc., was ground with a ball mill and had a fineness of 350 mesh. The adhesive was blended before screen printing.

※ Screen printing ion exchange coloring of glass

The tinted glass can be obtained by exchanging sodium ions in the silver and the glass, and then reducing it to a metallic colloid. In the transparent glass plate, only the portion to be colored was printed with the screen ink containing silver ions. After the firing, only the printed portion turned from yellow to brown. Different firing conditions will change the color tone and density. Since there is no reflection difference between the non-colored portion and the colored portion, there is no unnatural feeling at all, just as the glass is melt-colored. The coloration of the characters and marks on the glass and the heat-resistance of the rear window glass of the car, as well as the brown color of the simple scale used in chemical experiments, were obtained in this way.

The screen printing ink (printing material) of this decoration process is mostly composed of silver carbonate, copper sulfate (burned powder), iron dioxide, talcum powder, etc., and a small amount of zinc powder is used as a catalyst.

※ Silk screen contact control panel

In designing the microwave oven temperature program, a switch combined with a microcomputer was used. This kind of switch is different from the usual mechanical switch. It is a switch printed on a glass plate. It has no moving parts and no bumps. It is very smooth, easy to remove, and can be opened and closed by touching with the hand. The surface of the control panel is covered with a conductive film, and the periphery thereof is screen-printed with a ceramic ink for decoration and character display. Its advantages are resistance to mechanical wear, chemical resistance, and easy decontamination. In addition, in order to color the glass during the design, the organic paint can be printed on the back surface. Since the back surface cannot be directly contacted, the durability is strong, and the selection of the ink is also large.

※ Extinction screen printing on the glass surface

The glass surface matting ink (made in Belgium) was printed on a soda-lime glass plate with a screen printing plate and washed for several minutes. The effect was similar to that of brown glass. Fluoric acid is usually used to etch glass. This is dangerous. The ink does not contain strong acids and the operation is relatively simple. The extinction effect and etching are similar.

※ Silk screen of electrothermal defogging device

In order to prevent the condensation of water vapor in the rear window glass of automobiles, more and more electrothermal demister devices have been printed. The screen printing method is to apply silver paste to a line on a smooth glass and fire the glass while bending the glass. When the rear window is fogged and fogged, let the lines heat up through the current, increase the temperature of the glass surface, and remove the moisture.

When this electrothermal defogging device is energized, some automobiles are not automatically switched on by manual switching, but are automatically powered off. The sensor of this automatic device is a screen-printed electrode on a thin plate glass with a saw-toothed electrode, and a layer of moisture-sensitive body is covered on the electrode. The power ratio of the humidity is automatically controlled to turn on and off the power.

※ Screen printing of liquid crystal display element

In the liquid crystal digital display device, two thin glass plates spaced approximately 10 μm apart are sealed, injected into the liquid crystal, and sealed. On these two glass surfaces, the silk screen is printed with “8” shaped transparent conductive strands. This “8” character consists of 7 parts, which can be partially increased in voltage to display 0-5 digits. The process of making this "8" pattern is first of all on a field glass with an entire electrically conductive strand. The idle ink is only screen printed on the "8"-shaped portion and then etched with acid to remove it. Printed portion of conductive strands.

Source: China Gift Business Network