Metal Pall ring packing is developed by the German company BASF sheet metal punching, ring wall with two rows within Shenshe leaves fenestrae. The each row fenestrae five lingula, each lingula bending toward the ring, pointing to the ring center at the center is almost the ride, the position of the upper and lower levels of fenestrae staggered, the total area of the openings in general about the whole ring about 35% of the wall area, many fenestrae Pall ring packing ring wall, making the the tower gas and liquid through freedom from the window, Pall ring packing is one of the main ring packing.