1. The pneumatic conveying system is mainly used by the manufacturers with large models of mixers and several units of mixers. At present, most domestic non-tire manufacturers directly unpack the ton bags.

2. The price of the mixer upstream system has little relationship with the size of the mixer model, which mainly depends on the scope, quantity, configuration and etc. Under the conditions of the same scope and quantity, the prices of the mixer upstream systems with two different structures are almost the same.

3. The higher of the mixer upstream system accuracy doesn’t mean the better the system is. On the premise that the product quality is not affected, appropriate accuracy requirements should be selected.

4. The operating stability and reliability of the negative pressure mixer upstream system are lower than those of the stereoscopic mixer upstream system.

5. The negative pressure mixer upstream system is not applicable to large mixers (such as 270L and above).