... 5.below 500 mesh Airflow sieving machine for cosmetic powder 1.principle of work WS series airflow sieving machine abandons the working ... energy or imposing vibration force , spring force , impulsive force to work , easily produce flying dust , and very hard to reach the ... to 120—180 meshes light calcium , 300 meshes haw powder , 320-500 meshes zinc powder , 500 meshes black iron oxide , red iron oxide ...