What is the principle behind liquid filter bags?

The core principle of the liquid filter bag's application isPhysical interception based on filter material pore size and medium adaptation mechanismEfficient solid-liquid separation is achieved through structured design. The key lies in the precise construction of the filter material: polyester, polypropylene, nylon, and other corrosion and wear-resistant materials are processed through needle punching, weaving, or coating techniques to form a three-dimensional filtration structure with controllable pore sizes (1-200 micrometers), which serves as the core barrier for impurity interception. When the liquid to be treated flows through the filter bag under the action of pressure difference, the fluid can pass through the filter material pores smoothly, while solid particles, suspended matter, colloids, and other impurities, due to their particle sizes being larger than the pore sizes or being adsorbed by the filter material fibers, are retained on the surface of the filter bag (surface filtration type) or within the internal pores (deep filtration type), thereby achieving the separation of clean liquid from impurities.

To ensure filtration stability, the filter bags are designed with seamless stitching and folded edge sealing to prevent liquid short-circuiting and contamination leakage, ensuring that all fluids are processed through filtration. Additionally, different filter materials are matched to various medium characteristics: coated filter materials have a smooth surface, suitable for sticky contaminants, and prevent clogging; polypropylene filter materials are acid and alkali-resistant, ideal for chemical solvent filtration. By precisely matching the filter material pore size to the medium characteristics, liquid filter bags can achieve full-scenario purification from coarse filtration to fine filtration, meeting the solid-liquid separation needs of various fields such as industrial production and environmental protection.