Wire and cable product testing project
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Second, in the production process, the copper wire must be grounded and kept in line with the spark machine's grounding to ensure that the spark test is effective, and at the same time, to ensure the production personnel's protection against electric shock, the pay-off wire or take-up reel can be used to prevent the copper wire from being grounded. The problem occurred.
Again, extrusion is the key link, and the appropriate melting temperature should be chosen based on the different compounds. Usually, the temperature of the nozzle of the extruder is low, the temperature in the middle section is basically the same, and the head temperature is the highest. During the production process, the temperature of each section should be monitored and recorded regularly to prevent excessive or under-melting of the rubber material. Over-melting and under-firing can lead to a decrease in the insulation of the wire and cable.
The last is the spark test. Currently, after wire and cable extrusion, the factory uses water to cool the wire. Therefore, before the spark test, the moisture on the surface of the wire and cable must be removed to avoid the flashover caused by moisture. For example, the air is removed by wind blowing. Moisture.
Spark test is a key link in the production of wire and cable. Select the appropriate test voltage according to the insulation thickness of the wire. Because too low voltage does not ensure that the quality of the wire meets the requirements, and if it is too high, the insulation performance of the wire is damaged. The spark test must ensure that the wire and cable stay in the high voltage test area for not less than 5 seconds, can be controlled by adjusting the take-up speed. During the test, static electricity is usually generated on the surface of the wire and cable. Therefore, static electricity on the surface of the wire and cable should be removed immediately after the spark test to avoid damage to the production personnel. At the same time, in order to ensure that the test results are valid, the spark test must be periodically calibrated and checked for effective operation.
In addition, linear adjustment is also essential. Adjust the production equipment to ensure that the wires and cables are in a straight line in the production process. In particular, the conductors at the head should be as concentric as possible between the conductor and the inlet and outlet, so that the average insulation thickness of the wire is closer to the thinnest point, which is beneficial to Improve wire and cable insulation and save raw materials.
There are thousands of domestic wire and cable manufacturers, and the quality is uneven. A large number of black manufacturers produce inferior wires and cables, and even counterfeiting famous brands to defraud commercial interests. Fire and other safety accidents due to quality problems of electric wires and cables have occurred from time to time. Therefore, the inspection of wires and cables is extremely important.
In view of this, as early as in previous years, China has established detailed standards for wire and cable from production to application and testing. Currently, the quality agencies of all electrical testing projects in China have basically carried out wire and cable product testing projects. At present, the unqualified wire and cable on the market involves all aspects of the standard requirements, including the unqualified dimensions and signs, and has not passed the electrical performance test, especially the DC resistance and insulation resistance test. 
