PVC cable material granulator, PVC granulator

cable material granulator, C cable material granulator, cable material does not contain cadmium, chromium, mercury and other heavy metals that are harmful to the human body and the environment, as well as harmful substances such as polybrominated biphenyls and polybrominated diphenyl ethers. Meet the national standard B/ requirements for polyvinyl chloride cable materials. Ordinary soft polyvinyl chloride (C) 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 C cable materials contain a certain amount of harmful substances such as lead and cadmium, which has become an important factor restricting the application of C 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 C cable materials have become a general trend, and the development of environmentally friendly C cable materials has become the main variety in the current development and production of C cable materials. This article studies the formula, process and performance of environmentally friendly soft C cable materials.
Process flow: The process flow of using waste C cable materials to produce special lining materials and deep processing is as follows: waste C cable materials collection&rrr sorting and screening&rrr crushing and cutting&rrr mixing sampling test&rrr demagnetization bagging&rrr proportioning mixing &rrr High-speed mixing&rrr Extrusion and mastication&rrr Granulation and cooling&rrr Air conveying and bagging&rrr Sampling test&rrr Extrusion lining&rrr 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 C cable materials, foreign matter should be carefully selected and cannot be mixed with materials such as copper, aluminum and C cable tape. Metals such as copper and aluminum and wood chips must be separated to ensure that the waste C cable materials are clean and free of waste. clutter. The crushed and bagged waste C cable material is stirred and mixed at a mixing temperature of ~℃~, and then the uniformly mixed C material is 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. During the secondary granulation of waste C 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 (mesh) should be replaced every time to prevent the filter screen from being broken by impurities and coke materials in the waste C cable material, which may be mixed in when extruding the lining layer. Impurities cause the cable sheath to have a high spark rate and voltage breakdown. 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 such as C and water vapor, resulting in pores and pinholes in the lining layer, poor process release performance, and rough appearance of cable products. , not smooth. The special C lining material 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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