Friction coefficient ( f_0) of bulk solids ( G) on the surface of belt is determined by their characteristics. Lateral forces beared by bulk solids in trough belt make the friction forces in crease. 散料G在平面胶带上的摩擦系数f0决定于二者之间的特性,散料在各种槽形胶带间受有侧压力,使得摩擦力增大。