Non-woven fiber surface treatment method of needle felt: Non-woven fiber layer, especially needle felt, after the completion of processing, the surface will have many prominent villi, which is not conducive to the dust from the surface of the fiber filter material. Therefore, the surface treatment is required. The purpose of the surface treatment of the non-woven filter material of the needle felt filter bag is to improve the filtration efficiency and the cleaning effect; to improve the heat resistance, acid and alkali resistance, and corrosion resistance; to reduce the resistance of the filter material and to prolong the use. Life expectancy. There are many methods for surface treatment, but generally they can be divided into physical methods or chemical methods. In physical methods, the most commonly used method is heat treatment. The
Singeing
The singeing can burn away the fibers on the surface and help the filter to remove dust. The singeing fuel is coal gas. If the singeing process is not well controlled, it may cause the surface of the filter material to be unevenly melted, which is not conducive to dust filtration. Therefore, the singeing process is rarely used.
2, heat setting
The purpose of heat-setting the felt in the dryer is to eliminate the residual stress in the felt during processing and to prevent the deformation of the filter material such as shrinkage or bending during use. The
3, hot rolling light
Hot-rolled light is a more commonly used method in the surface treatment of non-woven fibers. By hot rolling, the surface of Chenzhou can be smooth, flat and uniform in thickness. The hot rolling mill can be generally divided into two types of rolls, three rolls and four rolls.
4, coating
The coating treatment can change the single-sided, double-sided or overall appearance, feel and intrinsic quality of the nonwoven filter media.
5, hydrophobic treatment
Generally, the hydrophobicity of the felt is poor. In order to avoid the dust adhesion on the surface of the filter material when the condensation phenomenon occurs in the dust collector, it is necessary to improve the hydrophobicity of the felt. Frequently used hydrophobic paraffin emulsions, silicones, aluminum salts with long chain fatty acids, etc.