The bipyramid highly effective and high thick skim gate uses the difference that between the txtile fiber and the impurity to cause the heavy impurity separate from the paper pulp and achieves the goal of the purification paper pulp.This skim gate area is small,productivity is big,the ease of operation,it does not stop up a row of slag thick liquid handling equipment,the textile fiber outflow is the zero,the cone wear-resisting pressure resistance and the service life is long.