Wide variety of plastic products, but the silk screen method, the sheet material and the plane body with flat screen printing method; the arc to expand into the flat surface of body and screen printing method; shaped products are screen printing using an indirect method. Solid plastic resins, additives and molding method of different, very different surface properties, especially surface smoothness, polarity and electrostatic problems, becoming plastic screen printing have problems and root causes.
PVC screen printing polyvinyl chloride (PVC) in 1931 put into industrial production. PVC has a brightly-colored and difficult to rupture, acid, alkali, low price and so on. However, when the manufacture of PVC by adding some of the supporting materials, often with toxic, so PVC products should not be in full bloom food. Many varieties of PVC film, commercially available in colorful plastic sheets, PVC artificial leather, etc. are mostly products. 2. ABS plastic screen printing ABS resin plastic, is a kind of engineering plastics. In recent years, is widely used in televisions, calculators and other products as well as the national economy in many areas. ABS plastic is acrylonitrile, butadiene, styrene terpolymer. As the ABS plastic is a copolymer, so both the common characteristics of three groups yuan, acrylonitrile copolymer can have a certain resistance to chemical corrosion and surface hardness; butadiene polymer can have a rubber-like toughness; styrene can be with the easy processing of the polymer forming characteristics. ABS plastic with a variety of colors, products with a shiny appearance, low water absorption, to a certain temperature range, has good impact strength and surface hardness, there is a better dimensional stability. Most of ABS resin in the temperature -40 ℃ still have a considerable impact strength, showing resilience, its products, the use of the temperature range of -40 ~ 60 ℃, ABS plastic, high molecular weight, physical performance, ease of processing molding, printing fitness is better. 3. Polyethylene, polypropylene, polyethylene plastic screen printing (PE) Plastic: Polyethylene plastic wide range of uses, by extrusion, injection molding made of a variety of finished products. Polyethylene molecules formed by the methylene-long-chain, which contains a certain amount of side group. Polymer side chain, the more the longer the base, then the lower the polymer crystallinity. In other words the more the higher the density of polyethylene is not conducive to the surface coating. Polyethylene in a variety of solvents is unclear, but when the temperature exceeds 70 ℃, polyethylene can be dissolved in a small amount of toluene, amyl acetate and other solvents. Polyethylene this nature, provided the conditions
for the surface finish. Solvent-soaked plastic can be heated so that the surface swelling, destruction of part of the crystal to increase the ink film in the plastic surface of adhesion. Fuming sulfuric acid, concentrated nitric acid, chromic acid Inflatable and sulfuric acid mixture, at room temperature can be slow and acting on the polyethylene; in 90 ~ 100 ℃ when the sulfuric acid and nitric acid, can rapidly destroy polyethylene; heavy lead-acid potassium, sulfuric acid, distilled water The mixture, in the 70 ~ 75 ℃ under the soaking of polyethylene plastic, is conducive to strengthening the surface of ink film in the plastic adhesion. Polypropylene (PP) Plastic: Polypropylene plastic over the years, one of the development of important species. Applies to all molding method. Do all kinds of tubes, all kinds of box and thin films, fibers, etc.. Industrial Polypropylene has a high degree of spatial regularity, there is a high degree of crystallinity, and so is the index range of 89 ~ 95%, while a small amount of non-crystalline and low crystalline random Isotactic block of three-dimensional structure of macromolecular chains. Melting point of 170 ~ 175 ℃ within the glass transition temperature of isotactic polymer is -13 ~ 0 ℃, while the syndiotactic polymer of O ℃. Concentrated nitric acid, fuming sulfuric acid to polypropylene erosion at higher temperatures, soluble in aromatic hydrocarbons and chlorinated Inflatable hydrocarbons at room temperature, so that expansion only. Acids and esters also have some of its dissolution, with the higher content of isotactic polymer, solvent resistance is also increased accordingly. Overall crystallinity of polyethylene and polypropylene are the high and low surface tension non-polar molecular structure of the polymer material. In their molecular structure is not like a carbon-based, carboxyl, hydroxyl polar groups such as, compared with polyethylene, polypropylene, surface finishing easier.
Electronics plastic parts, screen printing of electronic products, particularly wireless products such as radios, tape recorders, television sets, for the appearance of demand is very high. Graphic designer decorated the appearance of the product is a very great importance, while China's current process for the exterior decoration Inflatablerestrictions on the art staff of the ideas, so that they can only be the product size, the use of a variety of lines, plastic itself, is limited color, to change the product appearance. After the plastic screen printing development for electronic products, decorative brings convenience, so a variety of electronic products in recent years, the domestic plastic screen printing is widely used.
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