Chipper Rotary Dryer And Ore Mill. Thickness of wood chips rotary dryer: 18-20mm. advantage: long using life. strong bearing base of rotary dryer, run steadily. the stove of sawdust rotary drum dryer consists of 3 sectors of fire-proof wall, 2 layer brick of every fire-proof wall. reasonable design can avoid open flame. so rotary dryer runs steadily, safely and have long life.