Foam in the pulp will affect the progress of pulp production, resulting in reduced productivity, but also reduce the density of the pulp, resulting in an increase in the cost of pulp; too much foam will make the fibers in the pulp float to produce floating pulp, foam and flocculation, resulting in uneven dispersion of pulp on the Internet, so that the quality of the paper is lowered; in addition, the generation of foam will also make the quality of the pulp and the performance of the pulp, resulting in pinholes on the surface of the paper produced, White spots and other defects.