Is the water filter element surface or depth when filtering?

The water filter element is divided into two filtration methods, namely surface filtration and depth filtration. Different filtration methods use different filter materials and achieve different filtration effects. Surface filtration mainly uses screen material, while deep filtration uses felt material. The differences are as follows: 1. Screen material (nylon monofilament, metal monofilament) directly traps impurities in the filter on the surface of the material. The advantage is that the monofilament structure can be cleaned repeatedly and the consumption cost is low; the disadvantage is that the surface filtration mode is easy to cause the surface of the filter bag to be blocked. This type of product is suitable for coarse filtration with lower precision, and the filtration accuracy is 25-1200μm. 2. Felt materials (needle punched cloth, melt-blown non-woven cloth) are common deep-layer three-dimensional filter materials, which are characterized by loose fiber structure and high porosity, which increases the amount of impurity interception. This type of fiber material belongs to the compound retention mode , That is, larger particles and impurities are trapped on the surface of the fiber; while the fine particles are captured in the deep layer of the filter material, so the filtration has a higher filtration efficiency. In addition, high-temperature surface heat treatment, that is, the application of instant sintering technology, can effectively prevent the filtration The fiber is dissipated by the high-speed rush of the fluid; the felt material is disposable (one-time use), and the filtration accuracy is 1-200μm. The main material properties of hydraulic oil filter element filter felt are as follows: Polyester-commonly used filter material fiber, good chemical resistance, working temperature less than 170-190 ℃; polypropylene-used for liquid filtration in the chemical industry, some Anti-acid and alkali function, the working temperature is less than 100-110℃; wool-good solvent resistance function, but not suitable for acid and alkali filtration; nylon-good chemical resistance function (except acid resistance) , The working temperature is less than 170-190℃; fluoride-has the function of temperature resistance and chemical resistance, and the working temperature is less than 250-270℃.

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