Cause 1: Excessively fast feeding speed, resulting in insufficient residence time of materials in the drum.
Solution: Reduce the feeding speed to ensure materials have enough drying time.
Cause 2: Too low temperature of the heat source or insufficient heat supply.
Solution: Increase the temperature of the heat source, check whether the heat source system works normally, and ensure sufficient heat supply.
Cause 3: Excessively fast drum rotation speed, leading to short contact time between materials and the heat source.
Solution: Reduce the drum rotation speed to increase the turning and contact time of materials in the drum.
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