Food supplies spices. 
Reason: In Case material leakage too low drying effect. 
Solution: change the whole bed into the wind segment, segment operating temperature.

General Vacuum Dryer mostly drying heat-sensitive materials, which is the low-temperature drying. Calcination temperature generally in the 250°C above this called calcination, calcination select Rotary Vacuum Dryer benefits are: 
A, the same temperature in a high vacuum state affirmative; 
B, which is the closed type; 
C, and a solution of hazardous gas may be recycled. 
So again it comes to solving coefficient of expansion coefficient of expansion is the key, Yuntai took six months to put the expansion coefficient of the cylinder resolved.

Yuntai manufacture of high temperature oven can ensure that the outer wall of the normal temperature, room temperature to ensure that only two ways to solve. 
A, increasing the thickness of the insulation layer; 
B, is the key to solve the heat transfer. 
General manufacturing oven is manufactured outside inside, Yuntai manufacture indeed the opposite is really out there in manufacturing.