Sendemory Metal Products Co., Ltd.

Cable material granulator, granulator manufacturer
Tests and test results show that the cable material does not contain heavy metals such as cadmium, chromium, mercury, and harmful substances such as polybrominated biphenyls and polybrominated diphenyl ethers that are harmful to the human body and the environment. The lead content is, Comply with standard mechanical properties and electrical properties to meet national standards/requirements for PVC cable materials. Ordinary soft PVC cable materials are easy to process, have superior performance, and have excellent electrical insulation properties. They are widely used in low-voltage wires and cables. However, ordinary cable materials contain a certain amount of harmful substances such as lead and cadmium, which has become an important factor restricting their application in electrical equipment, infrastructure and other occasions. At present, there is a huge demand for environmentally friendly cable materials at home and abroad. Developed countries such as Europe and the United States have successively formulated environmental protection standards for heavy metal elements such as lead, cadmium, and mercury, and environmentally harmful substances such as polybrominated biphenyls. Lead-free and non-toxic soft cable materials have become the general trend, and the development of environmentally friendly cable materials has become the main variety in the current development and production of cable materials. This article studies the formula, process and performance of environmentally friendly flexible cable materials.
The process flow of using waste cable materials to produce special lining materials and deep processing is as follows: collection, sorting, screening, crushing, cutting, mixing, sampling, testing, demagnetization, bagging, proportioning, mixing, high-speed mixing, extrusion, granulation, cooling Air conveyor bagging sampling test and extruded lining sampling test. , Production control points Process parameters are the core elements of extrusion granulation. If the process parameters are incorrect, it will be difficult to produce qualified products even with excellent formulas. Whether the process parameters are set reasonably will directly affect whether the semi-finished product is fully mixed and plasticized evenly, and whether it can achieve the preliminary pre-molding effect. Otherwise, it will not only cause problems with the appearance and performance of the product, but will also easily cause problems during deep processing (extruded cable lining). Quality anomalies occur. During the collection, crushing, demagnetization and sorting process of waste cable materials, foreign matter should be carefully selected and cannot be mixed with materials such as copper, aluminum and cable tape. Metals such as copper and aluminum and wood chips must be separated to ensure that the waste cable materials are clean and free of debris. The crushed and bagged waste cable materials are stirred and mixed at a mixing temperature of ~℃~, and then the uniformly mixed materials are added to the double-stage twin-screw extrusion granulation unit for extrusion and granulation. The extrusion temperature is ()℃. The granulated pellets need to be dispersed and cooled to prevent the pellets from sticking. When re-pelletizing waste cable materials, the filter screen must be replaced regularly in strict accordance with the process requirements, and the exhaust device must be checked regularly. Generally, the stainless steel filter screen (or copper filter screen) with a layer of mesh holes (~ mesh) should be replaced every ~ to prevent the filter screen from being broken by impurities and coke materials in the waste cable materials, and causing damage due to the mixing of impurities when extruding the lining layer. As a result, the spark rate of the cable sheath is high and voltage breakdown occurs. It is necessary to strengthen the inspection of the exhaust device to avoid air leakage in the exhaust device, which will reduce the vacuum pressure and make it difficult to discharge decomposition products and water vapor, resulting in pores and pinholes in the lining layer, poor process release performance, and a rough and rough appearance of the cable product. Not smooth. The special lining materials produced by secondary granulation should be used in time and should not be placed for too long to avoid the material absorbing moisture. It is recommended that the placement time should not exceed one month.
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