Plastic surface treatment is the use of physical, chemical, mechanical and other methods in the plastic surface processing, surface treatment is to meet the special characteristics of the product, such as corrosion resistance, wear resistance, decoration or other special requirements, called secondary processing; plastic surface secondary processing is divided into four categories of printing, laser, painting, electroplating.
A, printing
Plastic surface printing are screen printing, pad printing, heat transfer, hot stamping, etc..
The principle of screen printing printing: screen printing is through the extrusion of the scraper, so that the ink is transferred to the substrate through the mesh of the graphic part, forming the same graphic as the original.
The principle of pad printing printing: pad printing is also called surface printing, is the first ink into the engraved text or pattern intaglio plate, followed by the text or pattern copy to the rubber, and then use the rubber to transfer the text or pattern to the surface of the plastic molding, and finally through heat treatment or ultraviolet light irradiation and other methods to make the ink curing.
The principle of heat transfer printing: the pattern is printed on special release paper with sublimation ink beforehand, and then the pattern is transferred to plastic film. The advantage of heat transfer printing is that heat is used to transfer the pattern or design from the rubber or paper film to the work surface. Transfer or stamping process, only need to be stamped once on the printed material, it can be a variety of color patterns transferred on the plastic parts. This can reduce the bad rate of the rubber parts, beautiful pictures, with ordinary stamping machine, heat transfer machine can be completed. Simple operation, exquisite printing work, low production costs. Small loss of products, high added value, strong decorative process. High covering power, strong adhesion. Meet the green printing standards, no environmental pollution.
The principle of hot stamping printing: hot stamping is the use of special foil, at a certain temperature to transfer text and patterns to the surface of plastic products; the advantage is that the method does not require treatment of the surface, the use of a simple device can be color printing. In addition, it can also be printed with gold, silver and other metallic luster products.
Second, laser
Laser engraving, also known as laser printing technology, is a printing method that uses the high energy held by the laser to print text and patterns directly onto the surface of the material. According to the different printing methods, it can be divided into scanning laser machine and shielding laser machine.
The principle of scanning laser machine: Scanning laser machine is a method that uses two lenses equivalent to X-axis and Y-axis to control the laser light and print out the desired pattern or text on the substrate; the advantage is that it is good at printing small text; the drawing data is controlled by the computer, and it is suitable for less mass production.
The principle of shielded laser machine: when using shielded laser machine, the pattern or text to be printed must be made on the template in advance, and then the laser is made to pass through the template and engrave according to its projection; the advantage is that the time required for each print is extremely short, which is suitable for mass production.
Three, painting
Coating is the construction of paint on the object to be coated to form a solid coating film. The protective film formed can stop or delay the damage to the object from the outside, so that the life of the material can be extended. Coating also has a decorative role, giving the surface of the object to be coated with color, you can get a variety of effects of the appearance; coating also has a special, such as anti-static, anti-corrosion, insulation, etc.
Fourth, plating
In simple terms, plastic plating refers to the role of external direct current, electrolytic reaction in the solution, so that the surface of the plastic deposited a metal layer or alloy layer. Vacuum plating is a product that is coated under a high vacuum degree. The substrate of the film to be plated is mounted in a vacuum evaporation machine and vacuum pumped to make the vacuum degree in the coating reach 1.3×10-2~1.3×10-3Pa, and the crucible is heated to make the high purity aluminum wire (99.99% purity) dissolve and evaporate at a temperature of 1200℃~1400℃. gaseous aluminum. The gaseous aluminum particles are deposited on the surface of the moving film substrate, and are reduced by cooling to form a continuous and bright layer of metallic aluminum.
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Post time: Nov-18-2022