Surface processing flow of plastics and metals Surface processing flow of plastics and metals 1. Surface treatment of plastic products 1 1.1 Printing 1 1.2 Coating: 11 1.3 Hard coating 16 1.4 Metal effect treatment 16 2. Metal surface treatment 25 2.1 Iron and steel 25 2.2 Aluminum and aluminum alloy 28 Surface treatment of plastic products Printing If you need to print words or patterns on the surface of engineering plastics, there are several methods. Screen printing, curved surface printing, penetration printing, etching printing, electrochemical aluminum hot stamping laser printing (laser engraving). A. Screen printing 1. Introduction Screen printing is an ancient and widely used printing method. According to the different printing objects, it can be divided into: fabric printing, plastic printing, metal printing, ceramic printing, glass printing, lottery screen printing, billboard screen printing, stainless steel product screen printing, screen printing and lacquerware screen printing, etc. 2. Screen printing of plastics Screen printing of plastic parts is one of the secondary processes (or reprocessing) of plastic products. There are many types of plastic products, but in terms of printing methods, flat screen printing is used for sheets and flat bodies; curved screen printing is used for curved bodies that can be unfolded into a flat surface; and indirect screen printing is used for special-shaped products. The surface properties of plastic products vary greatly due to different solid resins, additives and molding methods, especially the smoothness, polarity and static electricity of the surface. Application scope of plastic screen printing: 1. Screen printing of ABS plastic. ABS resin plastic is an engineering plastic. In recent years, it has been widely used in products such as televisions, calculators and many fields of the national economy. 2. Screen printing of the appearance of plastic parts of electronic products. Electronic products, especially digital cameras, MP4, televisions, etc., have very high requirements for appearance. After the development of plastic screen printing, it has brought convenience to the decoration of electronic products. 3. Screen printing of plastic signs. In recent years, plastic signs and decorative parts with silk-screen graphics and text after plastic molding have developed rapidly. ……
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