Laboratory filler metal triangle screw filler wire packing industry packing, packing main loading in the smaller diameter tower, due to the filler particle size, specific surface area is big, the amplification effect of the tower, under normal circumstances, small particle packing tower in small diameter can achieve high separation efficiency, but after the tower diameter bigger, its separation efficiency will fell sharply, So when using small particles packing tower does not exceed 150 mm in diameter, and this is the use of this kind of packing should pay special attention to the problem in order to improve the separation efficiency of small particles packed tower, the packing list in three different mass transfer efficiency of the tower diameter surface degreasing treatment or surface corrosion by chemical methods, to improve the wettability on the surface of the packing. During the operation of the column, the method of pre-flooding can be used to wet the packing surface to improve the separation efficiency of the column. Previously, the small particle packed column is not only used in laboratory separation research, has been applied to the purification and separation process of fine chemical products. The packed column with small particles has become an important means for the separation of small batch and high purity products. Laboratory filler metal triangle screw filler wire packing industry packing Finn, out by the former Soviet union, the packing each lap was positively triangle, is to use wire winding and become, is winding each circle is not round but triangle, circle between each about 60 degrees, from transverse direction is a cross-sectional is six star polygon and filler particles.