15 years in a Shandong Chemical Co., Ltd. Changzhou Drying equipment purchase a 40 m² vacuum hollow paddle drier in the debugging process very smoothly, feeling good, the drying time soon, two days after problems emerged. vacuum how to spare on routine more than a year commissioning, modification and more have not been effective. 
Cause: The expansion coefficient of the spindle and the device is not considered a good, spindle runout destroyed the seal. 
Solution: change the form of the sealing means and sealing solve expansion coefficient.