nanning news: the prevention of general rubber sheathed cable conductor oxidation method-非凡电子娱乐

general rubber sheathed cable with 5 copper conductor as a conductor, in its production process, often found that copper oxide conductor discoloration, which seriously affect the quality of the products, become a difficult technical problem of many domestic cable manufacturers.

copper is a transition metal, easily oxidized by oxygen in the air under acidic conditions into black cuo. when the copper conductor surface water film or water, because the atmosphere contains large amounts of dust, such as smoke, coal, automobile exhaust, chloride and other acid, alkali, salt and other dust particles, these harmful substances dissolved in water or water film can be formed in the electrolyte, thus exacerbating the discoloration of the copper conductor. will affect the appearance of the product quality and the quality of the products, or affect the use of copper conductors, resulting in the cost of production waste. therefore, the copper conductor must be properly preserved, pay attention to anti oxidative discoloration.

cable with copper from the principle of the main physical barrier method of copper contact with moist air cathode protection, oxidation reduction method and chemical method to prevent oxidation of copper conductor to prevent oxidation in the formation of copper conductor surface passivation film, or to protect the conductor special surface spraying liquid. taking the production of general rubber sheathed cable as an example, the main methods of anti oxidation control in each process are introduced.

1, copper rod into the factory before transportation, testing and storage

most of china's copper cable enterprise purchased, should choose the quality of copper rod, transportation, delivery process and supplier specification system, copper rod into the factory inspection in accordance with gb/t 3048.2 or a cable enterprise enterprise standard implementation. the storage of copper rod can be covered with plastic cloth or plastic film covered copper rod, which is the simplest physical barrier to prevent the copper rod and wet air contact. workshop of copper rod copper rod must be one by one volume to visually inspect the blackening phenomenon, should be controlled from the source of production.

2, copper rod drawing process control

drawing 0.4mm monofilament is generally used in the continuous annealing copper wire drawing machine and tensile machine, need to pass through the line, wire drawing and annealing, cooling, drying and coiling process. first of all, we should choose the appropriate mold, must not be too small, otherwise it will be forced to make metal copper lattice variation, increase the sharp rise in metal temperature. second, check the ph of the emulsion, that is alkaline solution, at the same time should be added antioxidants in oil drawing, forming a passivation film on the copper conductor surface, prevent oxidation; put the line, keep the line tension stable and uniform, not excessive fibrillation; operation drawing process should ensure the proper level and guarantee the degree of uniformity of annealing, annealing to avoid insufficient or excessive annealing; take-up, copper conductor surface should not have residual liquid, can be placed in a dry place in front of the take-up felt (often change), to ensure that the monofilament drying. finally, with transparent plastic film in the footwall drawing after sealing, stored in a dry environment, pending the transfer, otherwise it will because of the risk of the conductor surface temperature is higher and the easy and wet air oxidation.

3, copper wire stranded (stranded) and insulating rubber, rubber sheathed extrusion process

the copper wire stranded for example, stranded conductors in the process, after the die making copper lattice structure change, in a strong external force, die after copper conductor temperature is too large to improve before the model, so the outer oxidized copper conductor. so it can be in the ground and in the process of transfusion hose antioxidant (0.3% benzene and three triazole alcohol solution) drops into the wire, drops into the standard by just infiltrating the surface of copper wire as the standard, to avoid local oxidation are too small or too much waste, in all the anti oxidation preparation work steadily, and then boot operation. the receiving line shall ensure that the receiving plate is dry, and the sealing plate is sealed with a transparent plastic film after the take-up reel is filled.

the conductor shall be wrapped longitudinally or wrapped around the polyester tape before being extruded and insulated. rubber insulation and sheath rubber in the extrusion process, should avoid thread water, and thread black oxide phenomenon.

we observed in daily production, through the selection of high-quality copper rod, effectively control the drawing process and emulsion concentration and temperature, annealing process, stranded copper conductor strand or surface passivation and prevent thrum water and other means, in addition, the operators should establish quality awareness, strengthen business training, adverse consequences to see clearly the copper oxide, strict quality control, can effectively control the quality of the copper conductor cable, prevent oxidation, which greatly improves the work efficiency, reduce rework frequency, thereby reducing into the beneficial effect and improve the intrinsic product quality.