What are the reasons for the blackening of the oxygen-free copper wire of wire and cable?
There are several reasons for the blackening of the wire and cable oxygen-free copper wire. The reason for the blackening of the copper wire is caused by many factors, not only the formulation problem, but also the state of the copper wire itself, the rubber processing technology, the rubber vulcanization process, The structure of the cable, the rubber coating of the jacket, the production environment and many other factors are related. 01 causes the copper wire to blacken 1. The area of ​​the wire drawing emulsified oil pool is small, the return pipe is short, and the sealing is caused, resulting in slow heat dissipation, resulting in high temperature of the emulsion oil. 2. It is caused by the annealing of copper wire. 1 The cooling water that is continuously pulled back is generally made of tap water and ground water. Due to the different water quality, the water quality of some areas is lower, only 5.5~5.0 (normally 7.0~7.5), the original emulsion is resistant. The oxidized oil film is washed away, and the annealed copper wire is easily oxidized and blackened; 2 The finished copper wire drawn by the ordinary wire drawing machine is annealed on the other annealing line, the cooling water is not used with anti-oxidant, the anti-oxidation time is short, and the oxidation blackening phenomenon will soon appear; 3, some old factories also use annealing cylinders to anneal, the following reasons will also cause oxidation, blackening: 1 The annealing cylinder nut is not tightened, and the air leaks after the carbon dioxide or high-purity nitrogen is washed out; 2 The temperature of the copper wire exiting the cylinder is too high, exceeding 30 °C; 3 The drawing emulsion is not well maintained and the pH is too low; 4. In another case, due to the widespread use of high-speed wire drawing, the speed is increased, the relative heat dissipation time is reduced, and the space and time are brought to the oxidation. Therefore, it is recommended that the manufacturer pay more attention to the fat content of the emulsion. Whether the temperature, pH value, etc. are appropriate, the bacteria can multiply rapidly in the spring yellow mold rain season, and the bactericidal fungicide can be used. In the summer, antioxidants can be used to solve the problem of oxidation and blackening. the reason 1. The deformation of the finished mold is too small; 2. The periphery and front of the mold insert are not sealed. Solution Add a rubber pad in the direction of the exit of the finished mold, and then screw the finished mold to solve the problem of oil leakage. 02 causes the coil to black out In life, we often use a variety of products that use coils, such as motors, speakers, hearing aids, remote control toys, wireless chargers, power switches, computers, etc. The blackening of the coil is due to the oxidation of copper wires. The main material of the coil is basically copper wire, and the metal will be oxidized, so we will see the coil black. 2, the material problem of the insulation layer: China's impregnating varnish, insulating oil production process, preparation methods, patent formulation technical information is still relatively backward, the production of processing impregnating lacquer basically only plays a short-term role, for a long time There will be a drop and failure. 3. Problems in use: In the process of using coil copper wire, we have such a problem—collision friction, slower rinsing, a large amount of moisture in contact with the coil, and lubrication with waste engine oil, causing damage to the surface of the conductor and insulation. , causing conductor oxidation during subsequent processing; 4. Copper wire annealing process: Copper wire annealing refers to a metal heat treatment in which the copper wire is slowly heated to a certain high temperature for a certain period of time and then cooled at a corresponding speed. However, once the temperature is higher than 50 °C in the production process, the specified pumping time is insufficient, the SO2 content is high, and the imperfect protective gas will cause insufficient annealing. After a period of time, the copper wire will be easily blackened. The reason why the copper wire of the coil is black is caused by many factors, not only the above four factors, but also the state of the copper wire itself, the coil processing technology, the vulcanization process, the structure of the coil, the formulation, and the coil production environment. And many other factors are related. 03 rubber cable copper wire blackening reason The reason why the copper wire is black is caused by many factors, not only the formulation problem of the rubber, but also the state of the copper wire itself, the rubber processing technology, the rubber vulcanization process, the cable structure, the sheath rubber formula, and the production environment. And many other factors are related. An active substance is the main active ingredient in a drug. Take a simple aspirin for example. Acetyl salicylic acid is synthesized through chemical process and purified to a specified purity. The synthesis of acetyl salicylic acid is made by adding various excipients, such as fillers, adhesives, disintegrating agents, etc., and then pressing it into tablets. The production of apis is generally either pure chemical synthesis, biological fermentation, or semi-synthesis, with biological fermentation followed by extraction followed by synthesis. Not all pharmaceutical enterprises make API by themselves, and many manufacturers do not have the scale to produce API. Even if there is large-scale production, the cost of production may be much higher than that of procurement. Therefore, most manufacturers buy bulk drugs, and then make preparations, so that the production of drugs can be completed without a very large scale. At present, China and India have become the two largest API producers in the world. Many European and American pharmaceutical companies, even some of their own original drugs, will give up the production of API as the patent expires and the market matures, and turn to purchase apis from China and India,API production generally go through laboratory, generated through laboratory bottle container canister, taking after successful, pilot magnification, which is to enlarge the quantity of the production, then no problem tends to be faced with a lot of small scale experiment, a very simple example, the heating process, due to the relatively small amount in the laboratory, uneven heating cases is less, But if it is scaled up to a few tons of pot, at this time the heating may be not hot in this place, where the paste pot, at this time you need to stir, but the speed of mixing is appropriate, this process needs to calculate or grope. Finally from the pilot test, and then to the formal production, the volume of further amplification, and will face a lot of new problems. Therefore, although some drugs are generic, the research and development of the whole process from small test, pilot test to the final mass production is indispensable, so even generic drugs have very high research and development costs. api meaning,api products to buy,best api products,cheap api products,best buy products api,best api products Shaanxi YXchuang Biotechnology Co., Ltd , https://www.peptidenootropics.com
1. Technical reasons: The reason why copper itself is not oxygen-free copper, the surface of copper will inevitably come into contact with air and oxidize during processing. Nowadays, the advanced production technology of oxygen-free copper has been introduced in China, which has undoubtedly greatly improved the blackening problem of copper wire. 
