Pall ring has make great improvement on raschig ring . It can improve the gas and liquid distribution, make full use of inside surface of the ring. Compared with raschig ring, it can improve processing load and reduce the pressure by 50%.

Step Ring absorbs advantages of short Raschig ring and improves PALL ring. Height diameter ratio of the ring is 1:2 and taper rolled edge is added to one end. It reduces resistance when the gas goes through the machine bed and increases flow rate. The intensity of the filling is quite high. Due to its structural characteristics, gas and liquid are distributed evenly and contact area of gas and liquid is increased, thus improving mass transfer efficiency.

Web corrugated Packing is a important milestone of the development of clear and neat filling. This kind of filling consists of arranged web pieces pressed into corrugation. Obliquity of corrugation is 30 or 45 and the neighbor two pieces are of opposite directions. When filling into the column, upper and lower filling trays cross by 90. It has advantages of high effectiveness, low pressure drop and large flow rate. This product includes BX.CY types, generally used in vacuum distillation, normal pressure distillation and absorption processes of matters hard to separate or thermal sensitive.