Share heat resistance Conveyor belt What about scars?
Appearance defects and their causes: the surface of the covered rubber is slightly concave and becomes the open scar. The open scar is the most common appearance defect of the heat-resistant conveyor belt. The main causes are:
If the plasticity of the rubber compound is too small, the fluidity is poor. If the covering rubber compound combination of ethylene propylene rubber is unreasonable, especially if the softener is used improperly, the plasticity of the rubber compound is small and the fluidity is poor, which may cause scars. The solution is to use the amount of softener and plasticizer reasonably, strictly control the plasticity of the rubber compound and the uniformity of the rubber compound, so that the rubber compound meets the process requirements, When the plate vulcanizer is closed, if the vulcanization speed of the rubber is too fast, the rubber has not yet been fully leveled. The rubber has been vulcanized, and the place that has not been filled is the scar. The solution: properly control the vulcanization speed of the rubber. For ethylene propylene rubber, the vulcanization speed of its heat resistant cover rubber is very slow, while the crosslinking agents of neoprene rubber are zinc oxide and magnesium oxide, If the magnesia moisture absorption agglomeration deteriorates and its activity is not enough, its anti coking performance will be poor, and the sulfur rate will often be too fast. Therefore, the key to solve this problem is to control the quality of magnesia. The rubber material is too plastic or viscous, which may cause cavitation during vulcanization.
Conveyor belt
If the rubber material is too viscous, when the flat vulcanizer closes the film, it is not easy to exhaust the air during extrusion, which often causes cavitation and scars. Therefore, the plasticity of the covering glue should not be too large. Generally, operations above 0.4 are not ideal, especially for neoprene. Due to the poor viscosity of ethylene propylene rubber and styrene butadiene rubber, if the plasticity of the covering glue is larger, there will be few visible scars. The demand is increasing, and the quality requirements are also increasing. The product not only has excellent performance, durability, but also has a beautiful appearance. There are no explicit national regulations on the appearance quality of conveyor belts, but the regulations of GB/T7894-2001 for ordinary conveyor belts and the chemical industry standard HC 2297-92 for heat-resistant conveyor belts are cited. The appearance quality is in accordance with the appearance quality standard of GB-526 fabric core conveyor belts. The appearance quality of heat-resistant conveyor belts is an important indicator, and the appearance quality is not only an appearance problem, The research on products is also a refinement.
