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What are the factors that cause appearance defects such as visible scars on the Heat Resistant Conveyor Belt?

Dec. 11, 2019

Conveyor belts are important short-distance conveyor belt equipment in industrial production. They are widely used and with the development of conveyor belt industry technology, conveyor belts with various characteristics are produced and applied. Therefore, in the process of using the conveyor belt, daily maintenance measures must be done to ensure the efficiency of the production line and the service life of the conveyor belt itself.

Heat Resistant Conveyor Belt

Heat Resistant Conveyor Belt

Heat resistant conveyor belt is a kind of conveyor belt used for conveying high-temperature materials. The heat-resistant conveyor belt is made of multi-layer rubber cotton canvas or polyester canvas covered with high-temperature or heat-resistant rubber. It is vulcanized and bonded together at high temperature. It is suitable for transporting hot coke, cement, slag and hot castings below 175 ° C.

Heat Resistant Conveyor Belt is mainly used in metallurgy, construction and other industries to transport sintered ore, coke, cement clinker and other high-temperature materials. The material temperature does not exceed 800 ° C, and the belt surface temperature does not exceed 220 ° C. Features: EPDM rubber is used as the cover layer, and the skeleton material is made of domestic high-temperature resistant canvas. The unique formula design solves the key problems of high saturation of ethylene-propylene rubber, poor adhesion, and low interlayer adhesion. It has the characteristics of light belt, long life (about 2-4 times) and good heat resistance. 

Some heat-resistant conveyor belts will have scars during the production process. If the surface of the covering rubber is slightly concave, which is the most common appearance defect of heat-resistant conveyor belts, then why heat-resistant conveyor belts have scars? What about appearance defects? The following Fabric Conveyor Belt Manufacturer will give you a detailed understanding of the reasons.

1. The plasticity of the rubber material is too small, resulting in poor fluidity. If the combination of the covering material of ethylene-propylene rubber is unreasonable, especially if the softener is used improperly, the plasticity of the rubber material is low, and the fluidity may cause scarring.

Solution: Use the softener and plasticizer in a reasonable amount, strictly control the plasticity of the compounded rubber and the uniformity of the compounded rubber, so that the compound meets the process requirements.

2. When the flat vulcanizing machine is closed, if the rubber vulcanization speed is too fast and the rubber has not completely flattened, the rubber has been vulcanized, and the unfilled area is a scar.

Solution: Properly control the vulcanization speed of the rubber. For ethylene-propylene rubber, the heat-resistant cover rubber vulcanization speed is very slow, and the crosslinking agent of neoprene is zinc oxide and magnesium oxide. If magnesium oxide absorbs moisture and agglomerates, Deterioration, insufficient activity, and poor anti-scorch performance, and the phenomenon of sulfur speed is often too fast, so controlling the quality of magnesium oxide is the key to solving this problem. The rubber is too plastic or too viscous, which can cause entrainment when vulcanized.

3. If the glue is too viscous, when the flat vulcanizing machine closes the film, it is not easy to squeeze out the air by squeezing, which will often cause air scars. Therefore, the plasticity of the covering rubber cannot be too large, and it is generally not ideal for operations above 0.4, especially for neoprene. Due to the poor adhesiveness of ethylene-propylene rubber and styrene-butadiene, if the plasticity of the covering rubber is a little larger, it will rarely appear scar.

Our company is Pattern Conveyor Belt on sale, welcome to consult.


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