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5. slice residence time (drying time): absolute retention time of PET recommended not less than 4 hours, preferably 6 to 8 hours. This is done by the theoretical calculated.6. Special Note: To comply with the dryer manufacturer's operating instructions.Dryer planned maintenance Daily checks:dry air dew point control; ? the right to check the drying temperature;Check the return air temperature before and after the after cooler; ? Check the hopper material level, ie the load operation; ? Clean return air filter, the other filters.