The production process of COTS generally follows the following procedures: rubber preparation, cot forming, cot vulcanization and surface treatment. Up to now, rubber roll forming and vulcanizing equipment has gradually stepped onto the fast lane of mechanization and automation, and most enterprises are still manual intermittent unit production. In recent years, with the continuous development of injection, extrusion and winding technology. Thus, the continuous production from rubber material to molding and vulcanization process is realized, and the production efficiency is doubled. As the rubber surface of the cot is not allowed to have any impurities, sand holes and bubbles, not to mention scars, defects, grooves, cracks, local sponges and different soft and hard phenomena. Therefore, only in the whole production process of cots, can the quality of batch products be guaranteed, the operation can be unified, and the cleaning, meticulous work and technical standardization be maintained.
Molding of industrial Cots and cots
Rubber roll molding is mainly to stick coated rubber on the metal core. The commonly used methods include wrapping method, extrusion method, molding method, injection method and so on. At present, most of the domestic enterprises are mainly mechanical or manual adhesive molding. Most of the foreign enterprises have realized the mechanical automation, which is produced by continuous bonding of extruded film or continuous winding of extruded rubber strip. Large and medium-sized manufacturing enterprises basically adopt profiling extrusion. At the same time, in the process of forming, the size and appearance of the products can be controlled automatically by microcomputer, and some of them can be formed by right angle extrusion and special-shaped extrusion.
For small and micro cots, a variety of production processes, such as manual placement, extrusion and casing, injection, injection and pouring, can be used. In order to improve the production efficiency, the molding method is mostly used, and the precision is far higher than the non molding method. The injection and injection of solid rubber and pouring of liquid rubber have become the main production methods
The use of profiling extrusion can eliminate the bubbles that may be produced and the molding method controlled by microcomputer automatically. At the same time, the labor intensity is greatly reduced. In order to prevent the deformation of COTS during vulcanization and to prevent the generation of bubbles and sponges, the flexible pressure method should be adopted for the package forming process. Usually, several layers of cotton or nylon cloth are wrapped on the surface of the cot, and then fixed and pressurized with steel wire or fiber rope.
Preparation of rubber compound for industrial Cots
After the rubber mixture reaches uniform mixing, it is necessary to filter the rubber with a rubber filter to eliminate the impurities in the rubber compound. Then, the calender, extruder and laminating machine are used to make films or strips without bubbles and impurities for forming cots. Before molding, keep fresh surface to prevent adhesion and extrusion deformation, and strictly inspect the appearance of these films and adhesive strips. There should be no impurities and bubbles on the surface of the film and rubber strip, otherwise sand holes may appear when grinding the surface after vulcanization.
For cots, rubber mixing is the key link. There are more than 10 kinds of rubber materials for cots, ranging from natural rubber, synthetic rubber to special materials. The rubber content is 25% - 85%, and the hardness is 0-90 degree, which spans a wide range. The conventional method is to use an open mixer to mix and process in the form of a variety of master compounds. The so-called rubber mixing machine is a kind of rubber mixing machinery with exposed rollers, which is used in rubber factory to prepare mixing rubber or carry out hot refining, plastic refining and molding of rubber materials. But these are plastic mixing machines. In recent years, more and more enterprises use meshing internal mixer to prepare rubber compound by subsection mixing.