Screen printing of plastic parts is one of the secondary mechanics (or reprocessing) of plastic products. The so-called secondary processing is after the plastic injection molding, and then a surface decorative treatment, such as: plastic plating, plastic spraying, plastic hot stamping, plastic screen printing and so on. The secondary processing of plastic products, therefore, is mainly determined by the properties of the plastic itself, such as its relatively uniform dyeability, and the poor lightfastness of the colors. In order to make up for these disadvantages and improve the appearance of plastic products, secondary processing is required.

A wide variety of plastic products, but for the silk screen method, the sheet and flat body with a flat screen printing method; can be developed into a flat curved surface curved screen printing method; special-shaped products are used indirect silk screen method. The differences in the surface properties of plastic products, including the solid resins, additives, and molding methods, are especially the smoothness, polarity, and static electricity of the surface, which is the root cause of the failure of plastic screen printing.

1. PVC screen printing Polyvinyl chloride (PVC) was put into industrial production in 1931. PVC plastic has bright color, not easy to break, acid, alkali, low cost and so on. However, due to the fact that some auxiliary materials that are added during the manufacture of PVC plastics are often toxic, it is inappropriate for PVC products to hold foods. Polyvinyl chloride film variety of colors, commercially available colorful plastic cloth, artificial leather, etc. are mostly PVC products.

2. ABS plastic screen printing ABS resin plastic, is an engineering plastic. In recent years, it has been widely used in televisions, calculators and other products and in many areas of the national economy. ABS plastics are terpolymers of acrylonitrile, butadiene, and styrene. Because ABS plastics are terpolymers, they share the common characteristics of three components. Acrylonitrile can make the copolymer chemically resistant and have a certain surface hardness; butadiene can make polymers have rubbery toughness; styrene can be The polymer has easy processing and shaping properties. ABS plastics have a variety of colors, products have a glossy appearance, low water absorption, good impact strength and surface hardness within a certain temperature range, and good dimensional stability. Most ABS resins still have considerable impact strength at -40°C and exhibit toughness. The service temperature of the products ranges from -40°C to 60°C. ABS plastics have high molecular weight, good physical properties, easy processing, and printing. Suitability is good.

3. Polyethylene and Polypropylene Plastics Screen Printing Polyethylene (PE) Plastics: Polyethylene plastics are widely used and can be manufactured into various finished products by extrusion, injection, and other molding processes. The polyethylene molecule is a long chain of methylene groups containing a certain amount of pendant groups. The more and more side groups in the polymer chain, the lower the crystallinity of the polymer. That is, the higher the density of polyethylene, the more unfavorable the surface finish. Polyethylene is not clear in many solvents, but when the temperature exceeds 70°C, the polyethylene can be dissolved in a small amount in solvents such as toluene and amyl acetate. The nature of polyethylene provides conditions for surface finishing. The plastic can be soaked with a heating solvent to swell the surface and destroy part of the crystallization to increase the adhesion of the ink film on the plastic surface. The mixture of fuming sulfuric acid, concentrated nitric acid, chromic acid and sulfuric acid can slowly act on polyethylene at room temperature; sulfuric acid and nitric acid can quickly destroy polyethylene at 90-100°C; use heavy lead potassium, sulfuric acid and distilled water The mixed liquid, soaked in polyethylene plastic at 70~75°C, is beneficial to enhance the adhesion of the ink film on the plastic surface.

Polypropylene (PP) Plastics: Polypropylene has been one of the important varieties of plastics for many years. Suitable for all molding methods. Can do all kinds of pipe, all kinds of box and film, fiber and so on. Industrial polypropylene has a high degree of spatial regularity, a high degree of crystallinity, and an isotropic index in the range of 89 to 95%. It also contains a small amount of amorphous atactic and low crystalline macromolecular block macromolecular chains. The melting point is in the range of 170 to 175°C, the glass transition temperature isotactic polymer is -13~0°C, and the syndiotactic polymer is O°C. Concentrated nitric acid and fuming sulfuric acid are capable of attacking polypropylene. At higher temperatures, they can be dissolved in aromatics and chlorinated hydrocarbons. At room temperature, they can only swell. Acids and esters also have some dissolution effects on them, and as the content of isotactic polymers increases, the solvent resistance increases accordingly.

In general, polyethylene and polypropylene are high-molecular materials with high crystallinity and low surface tension and non-polar molecular structures. There is no polar group such as carbon group, carboxyl group or hydroxyl group in their molecular structure, and the surface finish of polypropylene is easier to be compared with polyethylene.

4. Screen printing of plastic parts for electronic products Electronic products, especially radio products such as radios, tape recorders, televisions, etc., have very high requirements for appearance. The designers of the art design attach great importance to the appearance and decoration of the products. However, the current technology used for exterior decoration in our country is limited, which limits the thinking of the artists and enables them to pass only the size of the products and the use of various lines. The plastic itself is limited. The color to change the appearance of the product. Since the development of plastic screen printing has brought convenience to the decoration of electronic products, plastic screen printing of various electronic products in China has been widely used in recent years.

5. Screen Printing of Plastic Signage In recent years, plastic signage and plastic molding components for silkscreen graphic characters have developed rapidly. For example, the screen printing on polyvinyl chloride rigid board (PVC board), polycarbonate, ABS, plexiglass, modified polystyrene plastic parts, has been widely used, and achieved a good decorative effect and economy benefit.

6. Screen printing of soft and hard plastic parts Screen printing of 1 plastic hose. There are several methods of printing plastic hoses, the main method of which is thermal transfer printing. The thermal transfer method uses sublimation dye ink or other materials to print the image on the transfer paper first, and then paste it together with the substrate and heat it from the back of the transfer paper to sublimate the paper surface dye. Graphic transfer to the substrate. After the plastic hose is surface-treated, it is passed between the sun gas and the transfer paper from the hose and a heated iron plate. The heated iron plate pushes the transfer paper to the hose and heats up the transfer. After transfer, the hose enters the drying device and the drying temperature is generally about 65°C. 2 soft plastic screen printing. Soft plastics are used to make toys, such as inflatable cartoon toys. When the production is usually first on the soft sheet plastic screen printing pattern, then cut, hot synthesis type. The thickness of the material used is generally 0.8~3.0mm. If screen printing with more than two colors is performed, most of the plastics will expand and contract, resulting in color misregistration between the second color and the first color. This trapping error causes the product to lose its original value and cannot be placed on the shelf as a good product. For this reason, multi-color printing can only be achieved with long presses that can hold flexible plastics. For long printing, the substrate should be fixed with an adhesive. It is worth noting that toy printing must use non-toxic and harmless inks in accordance with relevant standards. 3 Screen printing of hard plastic products. Hard plastic products are two kinds of hard plates and molded products. Tickets, signs, instrument dials, cosmetic containers, etc. are all made of hard plastic.

7. The screen printing surface of the instrument panel The surface material of the panel may be metal, various plastics, and paint. The appropriate ink is used to print some text and graphics on the panel, indicating some functions of the instrument and equipment, and also beautifying the panel. Screen printing text and graphics require clear, good adhesion, wear resistance, but also requires soft and elegant colors, giving people a sense of beauty. Here we mainly discuss how to use screen printing process to improve the quality of the panel.

8. The screen printing polyester label with color polyester labels is a new type of label that has rapidly developed in China in recent years. Because it has the advantages of colorful, decorative, easy to paste, simple manufacturing methods, low cost, etc., it is welcomed by the majority of users, and quickly obtained in high, medium and low-grade electronic products, household appliances, and stationery. Popular applications. At present, there are many specialized factories in the country that produce such signs. However, because the production processes of these factories are all designed in accordance with the needs of high-volume label processing, it is impossible for those polyester brand products with many varieties and small quantities to be viewed either in terms of processing technology or production cost. adapt. Here is a process technology that uses screen printing to print colored polyester labels for reference in the production of small-lot, multi-colored colored polyester signage producers.

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