Heat Resistant Conveyor Belt appearance defects and formation reasons, the surface of the cover rubber dimple becomes alum, alum is the most common appearance defect of heat-resistant conveyor belt, the main reasons are:
The plasticity of the rubber is too small to be poor in fluidity. If the blending composition of the ethylene-acrylic rubber is unreasonable, especially if the softener is used improperly, the plasticity is small and the fluidity is poor, which may cause alum. Solution: rational use of softener And the amount of plasticizer, 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 flat vulcanizing machine is closed, if the vulcanization speed of the rubber material is too fast, the rubber compound has not completely gone. In normal times, the rubber compound has been vulcanized, and the unfilled area is alum. Solution: Properly control the vulcanization speed of the rubber compound. For ethylene-propylene rubber, the heat-resistant cover rubber vulcanization rate is very slow, and the neoprene The cross-linking agent is zinc oxide and magnesium oxide. If the magnesium oxide moisture-absorbing agglomeration deteriorates, the activity is not enough, and the anti-coke performance is poor. The sulfur speed is too fast, so controlling the quality of magnesium oxide is the key to solve this problem. . The rubber is too plastic or too viscous to cause a gas swell during vulcanization.
If the viscosity of the rubber is too large, when the flat vulcanizing machine is combined with the film, the extrusion does not easily discharge the air, and the air will often cause alum. Therefore, the plasticity of the cover rubber should not be too large. Generally, the operation above 0.4 is not ideal, especially the neoprene. Because of the poor adhesion of ethylene propylene rubber and styrene butadiene rubber, if the plasticity of the cover rubber is large, it is rare.疤. The demand is also increasing, the quality requirements are getting higher and higher, not only the product performance is excellent, durable and the appearance is also beautiful. There is no clear and explicit regulation on the appearance quality of conveyor belts, but the provisions of GB/T7894-2001 ordinary conveyor belts, the chemical industry standard HC 2297-92 for heat-resistant conveyor belts, and the appearance quality of GB-526 fabric core conveyor belts Appearance quality standards, the appearance quality of heat-resistant conveyor belts is an important indicator, and the appearance quality is not only an appearance problem, but also a research on products.
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