筛药是制药工作中的一个重要操作步骤。筛药方法主要有机械筛药和手工筛药两种,在实际工作中对于80目以上的细粉,特别是具有一定粘性或吸附性的药粉,无论是机械筛还是手工筛,都存在着不同程度的药粉滞留、阻塞网眼现象,是筛药过程中的一个难题,一般靠撞击筛壁或软毛刷扫下滞留在网眼中的药粉来 Sieving drugs is an important operating step in pharmaceutical work. There are two kinds of screening methods: mechanical screening drugs and manual screening drugs. In practice, fine powders of more than 80 mesh, especially powders with certain viscosity or adsorption, are different whether they are mechanical sieves or manual sieves. The degree of drug powder retention and obstruction of the mesh phenomenon is a problem in the screening process. Generally, the powder that is retained in the mesh is swept away by percussive screening wall or soft brush.