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It was designed based on Raschig Ring by German BASF Company in 1940s. Pall ring is made of a metal thin sheet and have a special structure, there are two row window with ligules towards inside on the ring wall, each row window has five ligules bend to inside of the ring and point to the center, at which the ligules touch each other, the position of up and down window is stagger, usualy the area of window is about 30%of the whole ring area. The window on the ring wall let distribution and mass transfer effieiency of liquid and gas, inside packing, better than Raschig Rings.
Metal Pall Ring
