Various screen printing and its application (2)

Screen printing of glass

Glass screen printing is the use of screen printing plates, the use of glass glaze, decorative printing on glass products. Glass glaze is also called glass ink and glass printing material. It is a paste-like printing material that is mixed and stirred by coloring material and linking material. The coloring material consists of inorganic pigments and low-melting fluxes (lead glass powder); the linking material is commonly referred to as linoleum oil in the glass screen printing industry. After printing, the glass products are placed in a stove and fired at a temperature of 520 to 600°C. The glaze printed on the glass surface can be consolidated on the glass to form a colorful decorative pattern. If you use silk screen printing with other processing methods, you will get better results. For example, by polishing, engraving, etching, etc., the glass surface is processed before or after printing, and the printing effect can be doubled.

1. Glass products etch 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.

2. 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. Silk screen 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 glass flux layer. 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. For example, if the silk screen is printed with a colored flux, and the micro-ice is transparent, the flux layer of the glass ice pattern is discolored by the high-temperature eutectic, and a transparent, embossed relief pattern is formed on the glass surface.

3. Frosted screen printing of glass. The frosted sand is on the product glass and adheres to a certain size of glass glaze powder. After baking at a high temperature of 580-600° C., the glass glaze coating is melted on the glass surface, and shows a different color from the glass body. A decorative method. 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.

4. 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 represented by the simple scale of the experiment, 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.

5. 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.

6. Glass matte silk screen. 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.

7. Screen printing of electrothermal demisting 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.

8. Screen printing of liquid crystal display elements. The liquid crystal digital display element is about 10μn apart. The two thin glass sheets are sealed around and injected into the liquid crystal, sealed 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 the numbers (0 to 5). 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. $Page break $

Screen printing in the manufacture of electronic products

In the production of electronic products, screen printing has become an indispensable process. Such as the product shell decoration, printed circuits, thick film integrated circuits, solar cells, electricity; Ju, capacitance, piezoelectric elements, photosensitive elements, thermal elements, liquid crystal display elements, etc., are used in varying degrees in the production process Screen printing process.

Other screen printing methods

1. Lottery silk screen printing. In the past decade, the need for masking inks has increased year by year. In the offset text, numbers, symbols and then use screen ink thick screen printing film, so that it is completely covered, and then made of cards is a lottery ticket. Lottery tickets come in many forms, such as sports lotteries, social welfare fund-raising lottery tickets and so on. This type of lottery ticket can be seen by using coins or nails to scrape off the masked ink, and the printed text, numbers, etc. can be seen below. In addition, it is very popular for people to combine various kinds of interesting entertainment by masking images, words and numbers.

2. Screen printing of electrical decoration billboards. The electric advertisement board generally projects light from the inside of the advertising board to make the surface more beautiful. The main materials used are acrylic plates and glass plates. In addition to printing, the board is also decorated with cutout text and lines. The main processes of screen printing electrical decoration advertising board are surface printing, inside printing, full shading printing and so on. The most commonly used electric advertisement boards printed inside are electric screens printed on the inside of an acrylic board, and finally printed in solid white, and the surface of the board can be formed into a glossy decorative pattern. If the light inside disappears, light from other directions will reflect on the surface and various colors will appear.

3. Screen printing of metal advertising boards. Metal advertising boards refer to guide plates and billboards whose materials are metal plates. Their predecessors were billboards and melamine billboards. Metal materials are mainly made of aluminum and stainless steel. The surface of stainless steel has the advantage of no rust. After screen printing, hardener can be applied to the surface for processing. Aluminum can use its plasticity, embossed by the pressure method, so that its surface has a concave and convex pattern, enhance three-dimensional, and improve visual effects.

4. Screen printing of stainless steel products. There are many methods of processing on stainless steel surfaces, which can be roughly divided into two types. One is to treat stainless steel with surface gloss, and to use art processing to form a pattern using luster contrast; the other is to assign color to the composition of patterns. Art processing. Typical examples of screen printing methods include etching and spray color processing.

5. Screen printing of light reflectors. The light reflector is a kind of silk screen that is irradiated by the headlights or other lights of a car and the light is reflected by the irradiated object in the direction of the light source without being affected by the angle of irradiation or the weather. Reflective is a hollow glass particle with a diameter of about 40 μm, with a reflective layer at the other heart. Its flexible sheet-like support has an adhesive layer and a release layer on its surface as shown in Figure 4-32. A reflection layer is generally provided on an acrylic resin plate, and a reflection layer is formed by adding a certain amount of hollow glass particles with a transparent resin and printing by a screen printing method. The mesh number, hole width (opening degree), and type of hollow glass particles should be carefully selected during printing, and the hollow glass particles are regularly arranged.

6. Transfer the aluminum foil with a silk screen plate. Gorgeous and beautiful, bright aluminum color hot stamping through the hot stamping machine, on the substrate, its beautiful color has won wide appreciation. However, sometimes the bronzing machine will also encounter products that are not suitable for mechanical bronzing. However, the customers are stubbornly not using screen printing gold. In the dilemma, the unique screen printing plate transfer galvanized aluminum shows its superiority. Hot foil stamping stamping is mainly based on temperature and pressure, while screen transfer stamping is based on the role of adhesive. The reason why adhesives can transfer anodized aluminum is because the outermost layer of anodized aluminum consists of a glue layer.

7. Screen printing. In recent years, silk screen printing has been promoted and popularized in China, and many high-level works have appeared. The artistic level of silk screen printing is close to the woodcut print, but the production of screen printing is much simpler than the production of woodcut prints. In addition to the commonly used paper, silk screen printing substrates include cloth, plexiglass, wood, porcelain, and metal plates. This has broadened the road for the development of practical use of silk screen printing, such as the production of posters, decorative paintings, clothing, headscarves and the like in the form of screen printing. The printmaker can fully design and produce practical art and improve its artistic level. Wall hangings, screens, umbrellas, curtains, sofa covers, *mats, etc. are all areas where screen printing prints can play a role. On the one hand, pure artistic prints are produced. On the one hand, it is of great significance to open up positions for prints in practical art and to play a role in beautifying people's lives.

8. Lacquer screen printing. Screen printing has been introduced into the traditional industry, one of which is the lacquerware industry. Representative lacquerware products such as bowls, drawers and boxes can also be adapted to modern lifestyles