How to choose the liquid filter bag and his material

First of all, you need to understand the filtration mechanism of the bag filter system: the liquid flows from inside the filter bag to outside the bag, and the filtered particles are trapped inside the bag, and the working principle of the bag filter is pressure filtration. Bag filter system mainly includes three parts: filter container, support mesh basket and filter bag.

2, the precision of the filter bag selection:

First, according to the chemical name of the fluid to be filtered, according to the chemical compatibility taboo to find the available filter media, commonly used PE, PP, PTFE, NMO, and then for its operating temperature, operating pressure, acid and alkali values, operating conditions (for example, whether it must withstand steam, hot water or chemical sterilization, etc.), one by one to evaluate and eliminate the unsuitable filter media. Application is also an important consideration, such as pharmaceutical, food or cosmetic filter media must be FDA-approved materials; ultra-pure water must be selected pure, does not contain released material will affect the impedance of the filter media; filtration of gases must be selected hydrophobic materials and the need for "sanitary filtration" design, etc.

Polyester fiber (polyester, PE): special polyester fiber at room temperature has very good performance, is the main filter media in the bag filter. Can withstand the operating temperature of 130 ℃ under dry conditions; continuous work above 130 ℃ will become hard; fading; brittle, the temperature will also make its strength weakened. Accuracy range: 1 - 300 microns.

Nylon wire mesh (NMO): Nylon wire mesh, also known as nylon screen, nylon mesh, nylon screen, is made of nylon 6 (PA6) monofilament by flexible rapier loom plain weave, dyeing (if needed), heat-setting treatment. It is made from chemical synthetic fibers and belongs to the polyamide family. Nylon wire mesh has high strength, good abrasion resistance, chemical resistance, water resistance, and elasticity, and excellent ink penetration due to uniform wire diameter and smooth surface. The shortcoming is that the stretching of nylon wire mesh is larger. This screen in a period of time after the taut screen, the tension has been reduced, so that the screen printing plate relaxation, precision decline. Therefore, it is not suitable for printing circuit boards with high dimensional accuracy requirements, etc.