The structure of the Pall ring is very special. If the inner ribs are divided according to its shape and structure, it can be divided into: the inner ribs are in the shape of a cross, which is generally called a plastic Pall ring (well), and the inner ribs are of the Yonzi type, called Plastic Pall ring (m). The structural design of the Pall ring allows the liquid or gas inside and outside to circulate better, and is more evenly distributed around. Now all aspects of the Pall ring are being improved. Therefore, under the same pressure reduction conditions, its liquid phase distribution is very uniform, and the processing capacity is 50% higher than that of the Raschig ring.