Screen printing methods and requirements for the h

Silk printing methods and requirements for special products

I. lottery silk printing

in the past 10 years, the need for masking ink has increased year by year. In the offset text, numbers, marks and then use masking ink for silk thick film printing, so that it is completely covered, and then made into cards, that is, lottery tickets. There are many forms of lottery, such as sports lottery, social welfare fund-raising lottery, etc. This kind of lottery ticket, scrape off the covered ink with coins or nails, and you can see the words and numbers printed below. In addition, through masking images, words and numbers can be combined into a variety of interesting entertainment, which is very popular

1. The composition of lottery tickets. Because most lottery tickets are disposable, they are printed with paper, usually 150 ~ 200g/m2 coated paper. First, offset printing is used to print words, numbers, images, etc. the printing surface of offset printing is flat, which is very beneficial to the final masking silk printing. After offset printing, the substrate must be coated with a transparent outer layer, which not only makes the masking ink peelable, but also makes the offset graphics and texts stable. Then, the final screen printing is carried out on this coating with masking ink. Generally, local masking thick film printing is carried out only on words and numbers

2. Performance requirements of lottery tickets. ① After the stable masking ink is printed on the lottery ticket, it should be easier to peel off with nails or coins. As a commodity, the lottery printed with this ink should remain stable for at least one year. ② After stripping the masking ink, the exposed words and numbers cannot be polluted by the ink. ③ Masking ink should have sufficient masking. ④ The ink film covering the ink must have a certain toughness, that is, in the drying, cutting and other operations of the lottery, the surface of the ink film cannot be damaged by some external force. As a commodity, it also has the same requirements in circulation

from the above points, ③ and ④ are almost determined by the performance of masking ink, so it is very important to choose the right ink. And ① and ② are determined by the degree of adhesion between coating paper and masking ink. In the past experiments, the main faults are ① and ②, so this is a very key problem

second, the silk screen printing of the electric decoration advertising board

the electric decoration advertising board generally projects light from the inner side of the advertising board to make the surface more beautiful. The materials used mainly include Propylene plate and glass plate. In addition to printing, the board is also decorated with cut words and lines. The main processes of silk printing electric decoration advertising board include surface printing, inside printing, full shading printing, etc

the most commonly used is the electric decoration advertising board printed inside. Generally, silk printing is carried out inside the acrylic board, and finally white field printing is carried out. Its surface can be formed into a shiny and bright decorative pattern. If the light inside disappears, the light from other directions will be reflected on the surface, and various colors will also appear

when printing on the surface, the translucent board in milky white is generally used. Because there is no need for all white printing, uneven quality rarely occurs, but scratches are easy to appear because of surface printing

when shading, it can be printed by two methods: inside and outside. If the surface wants to use full red shading, before printing full red, the same printing plate can be used for the purpose of shading, printing a silver or gray, and then printing full red on it. When electric decoration is carried out, only the text or pattern part protrudes, which is very clear and beautiful, so it is often used for the printing of road signs or guide plates

when printing with propylene, due to its charged nature, it is easy to attach dust, so pay great attention

because the dust is obviously attached to the electric trim panel, in order to eliminate the dust and prevent static electricity, the substrate should be wiped with alcohol before printing. Because the light is emitted from the inside, the scratch mark of printing is also very obvious. Therefore, pay attention to the grinding of the scraper, printing pressure, printing speed, etc., and try to reduce the uneven phenomenon of printing. Due to the use of ink with good light transmittance, the color tone seems to have changed completely after printing and electrical decoration. When combined with other colors, if light transmission observation is not carried out, it is possible to make products different from customer requirements. Four color the experimental machine is simple and reasonable in structure. When printing, if you color without light transmission observation, sometimes a very light and fuzzy image will be formed

III. silk screen printing of metal billboards

metal billboards refer to guide boards and billboards made of metal plates, whose predecessors are enamel billboards, melamine billboards, etc. The metal materials are mainly aluminum and stainless steel. Stainless steel surface has the advantage of non rusting. After silk printing, the surface can be coated with hardener for processing. Aluminum can be embossed by using its plasticity and pressure method to make its surface have concave convex patterns, strengthen the three-dimensional sense and improve the visual effect

the earliest metal billboards were enamel billboards, which were made of galvanized iron plate and used enamel to prevent rust. They were mostly used for billboards, place name boards, etc. Although this brand has strong adaptability to the climate, it takes time to process and coloring is not easy. With the development of spraying technology, melamine billboards began to appear, which improved the rust resistance. The power of the selected Electromechanical is only 46 energy, which can be colored by digging and cutting plate making silk printing. Since billboards began to use hard plastic as the main material, melamine billboards give people a feeling that they have become obsolete. Iron billboards are obsolete. Due to their own weight, the processing is affected, and it is also very difficult in commodity circulation

the main material of metal advertising board has changed to aluminum plate or thin zinc plate. These are lightweight materials with good processability, which are easy to handle even if they are large in size. In order to increase the strength of the metal sheet, part of it can be raised into ribs, and its material consumption is roughly the same as that of the flat plate

IV. silk screen printing of stainless steel products

there are many methods of processing on the surface of stainless steel, which can be roughly divided into two kinds. One is to make stainless steel have surface gloss through treatment, and the artistic processing of using gloss contrast to form patterns; The other is the artistic processing of giving color to the composition of patterns. Among them, typical examples of using silk printing method include etching processing and color spraying processing

etching process is to print acid resistant protective film on the surface of stainless steel with colored silk, and then etch it with ferrous chloride solution to form artistic patterns. Spray color method is to spray pigment particles after silk printing to form the surface of pear skin sample and form artistic patterns

in recent years, in order to adapt to the diversity of uses of stainless steel and the increasingly high artistic requirements, the "color art" processing method with color has been developed and has become the mainstream in this field. Among the methods of giving color to stainless steel, there are methods of burning after printing color ink with silk and chemical coloring

the process of chemical coloring art processing of stainless steel products is: stainless steel products → screen printing → oxidation coloring → alkali treatment → finished products

the process of etching art processing of stainless steel products is: stainless steel products → screen printing → etching → alkali treatment → oxidation coloring → finished products

the process of spray color art processing of stainless steel products is: stainless steel products → screen printing → etching → alkali treatment → screen printing → oxidation coloring → alkali treatment → finished products

the chemical coloring method of stainless steel does not use pigments and dyes, but immerses stainless steel in heated concentrated chromium sulfate solution for chemical coloring, which is characterized by good food resistance. The inks used in this processing method should have very strong acid resistance. Generally, UV vulcanized inks with special properties suitable for the treatment process are used

v. silk screen printing of light reflector

light reflector is a kind of silk screen printing that is illuminated by the headlights or other lights of the car, and the illuminated object reflects light towards the direction of the light source, which is not affected by the irradiation angle or climate. The reflection is formed by a diameter of 40 μ M hollow glass particles, and other centers have reflective layers. The surface of its film like support is provided with an adhesive layer and a stripping layer. Generally, a reflective layer is set on the propylene resin board. The reflective layer is printed by silk printing method with a certain amount of hollow glass particles added with resin with strong transparency. When printing, carefully select the mesh number of wires, hole width (opening) and the type of hollow glass particles. The hollow glass particles are regularly arranged

this kind of printing is mostly used in various signs and commercial advertisements, which still focus on tightening the purchase cost, so that it can be confirmed in darker occasions. In addition, it can also be used for the printing of road signs, aviation channel signs, life-saving appliances, safety helmets for security, etc

VI. transfer anodized aluminum with silk plate

gorgeous and beautiful, bright colored anodized aluminum is displayed on the substrate after hot stamping by the bronzing machine, and its beautiful color has won wide appreciation. However, sometimes the bronzing machine will also encounter products that are not suitable for mechanical bronzing, and customers stubbornly do not use silk screen gold. In a dilemma, the unique silk screen plate transfer anodized aluminum shows its advantages. Bronzing machine hot stamping anodized mainly depends on temperature and pressure, while silk transfer anodized depends on the role of adhesive. The reason why the adhesive can transfer anodized is that the outermost layer of anodized is composed of adhesive layer

in the electrochemical aluminum transfer operation, first of all, the printed graphics and text should be made into a silk plate, and the graphics and text on the plate should be clear. Then use the silk plate to print a layer of adhesive on the substrate, and then stick the anodized aluminum on it, and then use cotton or sponge to gently press the image and text part, wait for it to dry, and tear off the anodized aluminum (if the viscosity is strong, you don't have to wait for it to dry, and the tearing time should be fast). The parts with adhesive show clear and bright anodized images and texts

adhesive formula is the key to transfer printing. The formula should be formulated according to the nature of the substrate, the nature of the anodized adhesive layer and the adaptability of the silk plate. The viscosity and concentration of the formula should be properly prepared. For example, when transferring cloth and PVC, polystyrene plastic products and wood products, the adhesive formula is:

perchloroethylene resin 100g

xylene 50ml

cyclohexanone 350ml

perchloroethylene resin can also be used instead of PVC resin or by blending the two. Low molecular weight PVC resin. When transferring Celluloid Plastic products, the xylene in the above adhesive formula can be changed to acetone. When transferring plexiglass products, add some chloroform. When transferring metal, ceramic and glass products, the adhesive formula is: epoxy resin 100%. (o) dibutyl benzoate 3% - 5%, ethylenediamine 12% - 15% (diluent can be added if the concentration is too high)

VII. Silk screen prints

in recent years, silk screen prints have been popularized in China, and many high-level works have appeared. The artistic level of silk engraving is close to wood engraving, but the production of silk engraving is much simpler than that of wood engraving. In addition to the commonly used paper, the substrate of silk screen prints also includes cloth, plexiglass, wood, porcelain plate, metal plate, etc. This widens the way for the development of silk screen prints in practical art, such as making posters, decorative paintings, clothes, headscarves, etc. in the form of silk screen prints. Printmakers can fully invest in the design and production of practical art to improve their artistic level. Wall hangings, screens, curtains, sofa covers, cushions, etc. are all areas where silk screen prints can play a role. On the one hand, making pure artistic prints, on the other hand, developing