Vacuum assisted method and equipment for preventing outflow of rubber by screw extrusion continuous dehydration drying

Abstract

The invention discloses a vacuum assisted method and equipment for preventing outflow of rubber by screw extrusion continuous dehydration drying for achieving the purpose of preventing rubber leakage in dehydration and exhausting by people using an outflow preventing exhaust device with a motor-controlled shaftless spiral device. Compared with a screw thread, the motor-controlled shaftless spiral device can generate higher downward thrust to rubber, so that the rubber slowly fills shaftless space and a spiral to reinforce the outflow preventing effect; water in the rubber escapes by being subjected to mechanical extrusion and two-time negative pressure; water escapes by two-time negative pressure, so that the rubber is dried more sufficiently; and a circuit control device does not need to be connected, so that the operation is convenient.

Description

technical field [0001] The invention belongs to the post-treatment field of synthetic rubber or wet mixing rubber, and relates to a vacuum-assisted screw extrusion dehydration drying method and equipment. Background technique [0002] The drying of rubber is an important process in the rubber production process, which occupies a considerable proportion in the total production energy consumption, equipment investment, and operating costs. At the same time, the drying process also directly affects the color, volatile content, and polymer content of rubber products. Parameters such as degradation and degree of crosslinking. [0003] In the early 1940s, the United States developed the production flow field of the emulsion method of styrene-butadiene rubber. In the post-processing, the drying process of vacuum drum suction and filtration of water and then pulverization into the drying box was adopted; in the 1950s, the mechanical extrusion dehydrator It replaced the vacuum drum ...

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Problems solved by technology

The reference document and this technical solution belong to the same technical field, among which 201420373553.7 is the closest prior art, but the use of the screw thread can also generate downward extrusion force on the upwelling plastic material, and the upwelling or The overflow plays a certain role in restraining, but there is no disclosure of the anti-spill shaftless screw device with motor control and an angle with the axis of the present invention. The technical solution disclosed in the above reference document needs to be connected with a more complicated circuit control device, and the operation is cumbersome. , and the exhaust port of the extruder is easy to emit material, there is no public use of equal-depth variable-pitch screw to increase the compression ratio in the compression section, so that the temperature and pressure are also gradually increased so that the moisture in the rubber is extruded, and When the rubber is used to reach the exhaust section, due to the deep groove of the screw and the large pitch, a lower pressure is formed, so that the water molecules, air and low molecular volatiles in the rubber escape, and are drawn out by a vacuum pump through the exhaust hole, thereby realizing The technical scheme of dehydration and drying of rubber has no anti-flush exhaust device, so it is not practical in actual production

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