In the process of using the liquid filter bag, the filtering mechanism of the filtration system that requires effective understanding of its equipment is preferred. The liquid flows from the filter bag to the outside of the bag, and the filtered particles are trapped in the bag. The liquid filter bag The working principle is pressure filtration. The bag filter system mainly includes three parts: a filter container, a support basket, and a filter bag.
Filter bag material selection
Filter bag in the process of selecting the first need to be in accordance with the chemical name of the fluid to be filtered, according to the chemical fit taboo to find the available filter material, and then use the filter medium temperature and operating pressure, type of impurities, Viscosity, pH value and other operating conditions.
Filter bag accuracy selection
Filter bags to remove visible particles, use 20 or 25 micron filter bags; to remove liquid clouds, use 1 or 5 micron filter bags; to filter out the smallest bacteria you need 0.2 micron filter bags. The problem is that there are two units of filtering accuracy: absolute accuracy/nominal accuracy.
First, according to the chemical name of the fluid to be filtered, find the available filter material according to the chemical compatibility taboo. Commonly used PE, PP, PTFE, NMO, and then its operating temperature, operating pressure, pH, operating conditions (eg, whether Must be resistant to steam, hot water, or chemical sterilization, etc.), and evaluate and reject unsuitable filter materials one by one. Use is also an important consideration. For example, filters for pharmaceuticals, food, or cosmetics must be FDA-approved materials; ultrapure water must be selected for pure, non-exposed materials that will affect specific impedance; filtered gases must be Choose a hydrophobic material and whether it requires a “hygienic filter” design.