After the singeing treatment of the filtrate surface of the liquid filter bag, the fiber can be prevented from escaping from the contaminated filtrate, and the filter can be prevented from being excessively blocked by the conventional rolling treatment, thereby shortening the life of the filter bag. The raw material is white, has not been bleached and dyed, and meets environmental protection standards. Due to the three-dimensional filter layer of the needle felt, when the liquid flows through the liquid filter bag, the particles will stay on the inner wall surface and deep layer of the liquid filter bag due to the deep filtration mechanism. Solid or colloidal particles have higher capture efficiencies.

The uniform thickness and stable opening ratio and strength of the needle felt make the efficiency of the liquid filter bag stable and the operation time is relatively long. The five-wire double needle is a relatively tight sewing process designed to achieve filtration standards for each liquid filter bag. More use, suitable for liquid filtration in various industries.