Mixer single screw CPE rubber cable material granulator

Chlorinated polyethylene rubber (cm or CPE) is an elastic polymer made of polyethylene by chlorine substitution reaction. Its properties are similar to that of chlorosulfonated polyethylene rubber, which is characterized by good fluidity, easy processing, excellent weather resistance, ozone resistance, corona resistance, heat resistance, acid and alkali resistance and oil resistance. The disadvantages are poor elasticity, large compression deformation and low electrical insulation. Operating temperature range: about - 20 ℃ ~ + 120 ℃. Wire and cable sheath, rubber tube, tape, rubber roller chemical lining, etc.

Mixing process

Mixing refers to the process of mixing all kinds of admixture evenly into raw rubber in the rubber mixer. The quality of mixing has a decisive influence on the further processing of rubber compound and the quality of finished products. Even if the rubber compound with a good formula is not well mixed, the mixture will be unevenly dispersed, the plasticity of rubber compound will be too high or too low, it is easy to scorch, spray frost, etc., so that the calendering, extrusion, coating and vulcanization processes cannot be carried out normally, and the performance of products will be reduced.

The mixing method is usually divided into open mixer mixing and internal mixer mixing. Both methods are batch mixing, which is a widely used method at present.

Generally, CPE with rubber resin for cable has The fixed crystallinity and high viscosity have the disadvantages of high Mooney viscosity, difficult rubber processing and extrusion, which affect its application in the wire and cable industry. In recent years, the elastic chlorinated polyethylene (CM) has been successfully developed in China, solving the long-term high price import of cm from abroad or the use of CPE which is difficult to process in the domestic cable industry. Cm is a kind of special rubber with good fire resistance and weather resistance, which is especially suitable for cable sheath and home appliance cable.

The internal mixing single screw CPE cable material granulator is designed with unique building block type screw block on the screw core shaft, which is disconnected three times in a pitch, which is called the mixing screw block. Corresponding to these gaps, there are three rows of mixing pins arranged on the inner sleeve of the machine barrel. During the radial rotation of the screw, the axial reciprocating motion is performed at the same time. The material is not only sheared between the mixing pin and the irregular trapezoid mixing block, but also transported to and fro. The counter current movement of the material adds an unusual axial mixing motion to the radial mixing. The melt is constantly cut off, turned over, kneaded and stretched according to the rules The simple laminar shear mixing is interrupted regularly, which is different from the common single screw and twin screw extruders. Because of mixing at the same time in radial and axial direction, the mixing effect is enhanced, and the dispersion mixing and distribution mixing are ensured, so the homogenization time is short. In addition, the engagement of the mixing pin and the screw block improves the self cleaning ability of the barrel. Through proper screw block combination, stable working pressure can be ensured, uncontrollable pressure and temperature fluctuation can not be generated, and degradation of materials in the barrel can be prevented. Because the thread of kneading element is interrupted, the pressure acting on the polymer is very small, and no obvious temperature rise is produced. Single screw extruder and twin screw extruder are used to shear thin polymer under high shear and high radial pressure, which will inevitably cause large temperature rise of melt and affect the principle of low-temperature extrusion of materials, compared with other machines. Under the same diameter. Its length and diameter are relatively short, and the torque is transmitted in a short distance. Therefore, the screw twist deformation is small.