**Liquid filtration needle-punched material** is a robust non-woven fabric produced by mechanically interlocking and reinforcing fibers through needle-punching technology. Its core function is **depth filtration**, utilizing a three-dimensional, bulky structure to capture solid particles in liquids through multiple mechanisms such as **adsorption, interception, and deposition**. It is characterized by **extremely high dirt-holding capacity, excellent strength, and reusable/washable properties**. **Main applications include:** 1. **Industrial filter bags and cartridges** – used for filtering slurries, wastewater, and circulating water in chemical, metallurgical, and cement industries; 2. **Deep oil purification** – regeneration of cutting fluids, rolling oils, and transformer oils; 3. **Food and beverage pre-treatment** – removal of impurities from syrups, beer, and beverages; 4. **Environmental water treatment** – filtration of suspended solids in rivers, lakes, and industrial wastewater. This material is particularly suitable for **complex liquid conditions with high solid content, high viscosity, and large flow rates**, making it a reliable choice for handling "dirty, concentrated, and viscous" liquids in industrial filtration.