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Thermal transfer technology is widely used in electrical appliances, daily necessities, building materials and so on. Due to its resistance to corrosion, impact, aging, abrasion, fire, and non-discoloration for 15 years in outdoor use, almost all products are manufactured in this way. For example, when you open the phone case, you can see the dense barcode label inside. Many label requirements can stand the test of time, no deformation for a long time, no fading, no wear due to contact with solvents, no discoloration due to high temperature, etc. Therefore, it is necessary to use a special material printing medium and printing materials to ensure these characteristics, generally Inkjet and laser printing technologies are not available.
The pad printing process is a special printing technology that was transmitted to China in the 1980s. Because of its obvious advantages in printing on small-area and uneven-surface products, it makes up for the shortcomings of the screen printing process. In the early 1990s, with the further opening of the Chinese market, a large number of foreign-invested enterprises with traditional industries such as electronics, plastics, gifts, and toys entered the Chinese market one after another. Printing technology and screen printing technology as the main decoration methods were even more Extraordinary development, according to incomplete statistics, the application of printing technology and screen printing technology in the above industries reached 27%, 64%, 51%, 66%.
Pad printing means that the substrate is an irregular shaped surface (such as instruments, electrical parts, toys, etc.), and a copper or steel gravure is used to cast a hemispherical print head through silicone rubber to press the layout. The way in which the ink is transferred to the substrate to complete the transfer printing.
Pad printing machine for the industry:
Plastics, toy industry, glass industry, metal industry, electronics industry, sporting goods, stationery industry, optical industry, IC packaging industry, etc
Ruler, pen, ball, doll eye, watch, camera, hair dryer shell, ceramic, medical equipment, racket, audio tape, electronic parts, IC, CPU, DRAM, computer case, buttons, decorative signs, big brother's case, etc. .
Generally speaking, the technical content of the printing process is not high. It is very difficult to continue to develop in the case of high production costs in developed countries, so the printing industry is transferred to developing countries with low labor costs like China. It is an inevitable trend. At present, in addition to a few companies that also manufacture high-precision printing production lines, most companies have moved their production bases to China.
How to fix our PCB:
1: Our extrusion enclosure have slots for installation easierly.
2: We could offer the rivet to fix.
3: The stud nut could be taking into consideration.
Copper plating: The copper plating layer is pink, soft, has good ductility, electrical conductivity and thermal conductivity, and is easy to be polished. Appropriate chemical treatment can obtain decorative colors such as bronze, copper green, black and natural color. Copper plating is easy to lose its luster in the air. It reacts with carbon trioxide or chloride to form a layer of basic copper carbonate or copper chloride film on the surface. It is brown or black copper sulfide by the action of sulfide. Therefore, as a copper The decorative copper plating layer needs to be coated with an organic coating on the surface.
Cadmium plating: Cadmium is a silvery white shiny soft metal. Its hardness is harder than tin, softer than zinc, good plasticity, easy to forge and crush. Cadmium is chemically similar to zinc, but does not dissolve in lye, dissolves in nitric acid and ammonium nitrate, and dissolves slowly in dilute sulfuric acid and dilute hydrochloric acid. Cadmium vapors and soluble cadmium salts are toxic and must be strictly prevented from cadmium contamination. Because cadmium contamination is very hazardous and expensive, galvanized or alloy coatings are often used to replace the cadmium-plated layer. At present, there are many types of cadmium plating solutions used in domestic production: cadmium plating with ammonia carboxyl complex, cadmium plating with acid sulfate, and cadmium plating with cyanide. In addition, there are pyrophosphate cadmium plating, alkaline triethanolamine cadmium plating and HEDP cadmium plating.
Tin plating: Tin has a silver-white appearance with an atomic weight of 118.7, a density of 7.3 g/cm3, a melting point of 2320 C, and an valence of divalent and tetravalent, so that the electrochemical equivalents are 2.12 g/A.h and 1.107 g/A.h, respectively. Tin has the advantages of corrosion resistance, non-toxicity, easy iron welding, softness and good ductility. The tin plating has the following characteristics and uses: 1. High chemical stability; 2. In the electrochemical sequence, the standard potential of tin is positive, and for the steel is cathodic coating, the substrate can be effectively protected only when the coating has no pores; 3, tin conductivity is good, easy to weld; 4, tin from the beginning of -130C crystallization began to mutate, to -300C will be completely converted into a crystalline isoform, commonly known as "tin 瘟", at this time Completely lose the properties of tin; 5, tin and zinc, cadmium coating, can grow into whiskers under high temperature, humidity and airtight conditions, called long hair; 6, after tin plating, re-dissolve in hot oil above 2320C A glossy tin layer can be obtained, which can be used as a decorative coating for daily necessities.
Electroplated single metal is also lead-plated, iron-plated, silver-plated, gold-plated, and the like. Electroplating alloys include: electroplated copper-based alloys, electroplated zinc-based alloys, cadmium-plated, indium-based alloys, electroplated lead-based, tin-based alloys, electroplated nickel-based, cobalt-based alloys, electroplated palladium-nickel alloys, etc. Composite plating includes: nickel-based composite plating, zinc-based composite plating, silver-based composite plating, and diamond inlaid composite plating.
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