The air stream passes through the surface of raw material only in traditional level chamber drier. The disadvantage is that the coefficient of heat transfer is low and the utilization factor is poor and the drying time is long. Moreover because of the defect of structure, it can not be in conformity with the requirements of "GMP". In order to overcome the shortcoming, we designed and developed the penetrating air stream box type drier on the basis of absorbing abroad advanced technology. The principle of work is shown in the figure listed below:
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