The material of the plastic ladder ring is PP, PE, PP, PVC, CPVC, PVDF and other materials. It is invented by the MTL company in the UK, so it is also called CMR. Plastic step ring packing side increased flanging, not only can increase the mechanical strength of the packing ring, and because the plastic step ring packing has destroyed the symmetry of the packing structure, so increase the directional probability of the packing. In addition, due to the influence of flanging, the contact between the ring gaps of the stepped ring packing is mainly changed from linear contact to point contact. Therefore, the material ladder ring packing not only increases the gap between the packing particles, reduces the resistance of gas passing through the packing layer, and these contact points can also be the convergence and dispersion points of the liquid flowing along the packing surface, thus promoting the surface renewal of the liquid film, which is conducive to the improvement of the mass transfer efficiency of the packing.

● Flux is large and pressure drop is small: because of the packing structure and loading characteristics, the gas channel in the packing layer is more uniform, and the return path is shorter, so the pressure drop of the packing layer is not increased when the gas flux of the coating layer is increased.

Low efficiency: the flanging of the plastic ladder ring packing not only can increase the gap filler layer, and make the gap even, is beneficial to uniform gap liquid form more uniform liquid film on the surface of packing, provide steam, liquid good channel, does not exist in pall ring or saddle packing surface or dry surface, thus ladder ring packing and mass transfer efficiency is higher compared with the above two kinds of packing.

● Large flexibility of operation: because the step ring packing has greatly improved the liquid distribution and gas-liquid contact inside the packing layer, so that the operating range has a longer growth, the L/G can be operated in the range of 50-0.05.