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What is the surface treatment process of plastic parts?

July 18, 2022

Summary and classification of common plastic surface treatment agents:
1、 Frosting
Frosted plastic generally refers to plastic film or sheet. When extruding the formed sheet, there is a frosted pattern on the surface of the forming roller, so that the frosted pattern will naturally form in the process of plastic cooling. This method is simple and fast, especially for transparent products
2、 Polishing
Using mechanical, chemical or electrochemical functions to reduce the surface roughness of the workpiece, so as to obtain a bright and flat surface. Plastic products are usually rolled up with frosted paper to polish plastic products, which is usually the first step before spraying!
3、 Spraying
Plastic spraying is mainly to apply a layer of plastic paint on metal equipment or plastic products, and then coax them to dry. Generally, it is dried for about 10 minutes. Thanks to the progress of paint, to achieve the same effect, there is no need to paste paper as before. Spray paint can isolate the air, and spray paint is an insulator, so it can play the role of anti-aging and anti-static of plastic products. The most important thing is to have the appearance effect that plastic products themselves do not have
。 In the spraying process of plastic surface, the effective method to solve the problem of poor adhesion between substrate and coating and paint falling off is Jingchuan chemical adhesive treatment agent, which improves the adhesion between substrate and coating and solves the problem of paint falling off, with an adhesion of 5B.
4、 Silk screen printing
The printing plate is usually square and in a fine mesh. During printing, the ink on the printing plate leaks from the through hole of the plate to the substrate under the extrusion of the ink scraper. There are many kinds of materials for making screen version, such as nylon (PA), polyacetic acid (CA), silk or metal mesh. If PC (polycarbonate) adopts this surface treatment, the color performance will be very ideal.
5、 Pad printing
First, the designed pattern is etched on the printing plate, and then the etched plate is coated with ink, and then most of the ink is transferred to the printed object through the silicone head.
6、 Heat transfer printing
The pattern is pre printed on the surface of the transfer film, and the exquisite pattern on the transfer film is transferred on the product surface through one-time processing (heating and pressurization) of the heat transfer machine. After forming, the ink layer and the product surface are dissolved into one, which is lifelike and beautiful, and greatly improves the grade of the product. However, due to the high technical content of this process, many materials need to be imported. Heat transfer process is applied to the surface of various ABS, PP, plastic, wood, coated metal and other products
7、 Water transfer:
It is a kind of printing that uses water pressure to hydrolyze the transfer paper / plastic film with color patterns.
8、 Laser engraving
The energy of laser is used to treat the surface into a "trace", exposing a layer of material under the surface, which can be engraved or patterned as needed.
9、 Electrophoresis (water electroplating)
One of the metal electrodeposition technologies, which usually uses chromium, zinc and other metals to obtain a deposition layer on the surface of the workpiece by electrochemistry. The plastic parts have a metallic texture outside, and the materials are corrosion-resistant and wear-resistant, with decorative and electrical, magnetic and optical properties. ABS and PC are common materials in the electroplating process. However, during the injection molding process, if mold release agent or mold oil stains are used on the surface of the material, resulting in oil spots, oil pits and oil spots, the effective solution is Jingchuan chemical electroplating oil stain treatment agent to cover the oil stains on the surface of the material, replace white oil immersion cleaning, improve the adhesion, and solve the problems of oil spots, oil pits and oil spots.
10、 Vacuum coating
In the vacuum chamber, the atoms of the material are separated from the heating source and hit the surface of the plated object. This method can obtain a dazzling effect, which is suitable for ABS and PC plastic products. At the same time, because of its complex process, high requirements for environment and equipment, it is generally suitable for large quantities of products.
11、 Biting (pitting, dermatoglyphics) for plastic molds
Concentrated sulfuric acid is used to corrode the inside of the plastic forming mold, forming snake lines, etched lines, ploughing, wood lines and other forms of lines. After the plastic is formed through the mold, the surface has corresponding lines.

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