During the operation of the liquid filter bag, the filtered out surface of the liquid filter bag undergoes a special singeing treatment, so that it can effectively prevent the fibers from detaching from the contaminated filtrate to some extent, so that the conventional roller press can be effectively avoided to some extent. The over-blocking of the filter pores caused by the treatment results in the shearing of the life of the filter bag. All the raw materials are white, completely free from any special bleaching treatment, and fully meet the environmental protection standards. The three-dimensional filter layer of the needle felt makes the liquid flow through the filter. In the bag, the particles are retained on the inner wall surface and the deep layer of the liquid filter bag due to the deep filtration mechanism, and have high trapping efficiency for solid or colloidal particles.
The thickness of the needle felt of the liquid filter bag is uniform and to a certain extent, the stable hole opening rate and sufficient strength make the efficiency of the filter bag more stable, and the application time is longer, and is mainly adopted during the production process. Its five-wire twin needles are the most closely stitched, ensuring that each liquid filter bag achieves the best filtration protection. Widely used, suitable for liquid filtration in various industries.
In a certain degree, the liquid filter bag mainly uses its porous medium to effectively separate its suspension. During the filtration work, under the action of its external force, the liquid in the suspension passes through. The outflow channel of the medium, so that the solid particles will be directly trapped, so that it can effectively achieve its separation to a certain extent, generally the suspension to be filtered is called filter; the porous media used is called filter media; The liquid that passes through the media pores is called the filtrate; the solids that are retained are called filter cakes or filter residue.
There are several ways to produce pressure difference in the liquid filter bag
1. Use the filter head itself.
2. Pressurize the surface of the filter.
3. Vacuum on the downstream side of the filter media.
4. Use inertial centrifugal force.
Filtering operation can be divided into two categories according to the principle of action
The pore size of the sieve filter media is smaller than the diameter of the solid particles, and the solid particles are removed from the suspension by means of sieve analysis.
The liquid filter bag is filtered out in the initial stage of filtration and the fine particles flow out, so that the filtrate is relatively cloudy in a certain degree, and the filtrate gradually becomes clear with the formation and thickening of the cake layer during the operation. As the mesh is gradually blocked, the filtration rate tends to decrease. Filtration process When the cake layer is formed, the screening effect is generated by the cake layer, the filter medium loses the screening effect, and only plays the role of supporting the cake layer, which means that the cake layer is filtered.