Plastic jet ring, also called alpha ring, is mainly made of PP, reinforced PP and other plastic materials. Mainly on the basis of pall ring filler by mold processing improvement, and pall ring chamber than its ring wall opening way is different. It extends to the fin in the ring, so that the window forms two open cones in opposite directions. As the cone leads the liquid flow and air flow to gather and disperse in the ring, strong disturbance is generated. Therefore, the ring has the advantages of high mass transfer efficiency and good liquid distribution, especially in a relatively large range of gas velocity separation efficiency can remain constant.

After special treatment, the surface of the packing of the Alfa ring has the advantages of good wettability and gas-liquid contact. It is widely used in the occasions requiring high heat and mass transfer efficiency, such as the air cooling tower and water cooling tower in the air pre-cooling system of air separation equipment and the packing tower in chemical equipment.