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Filtration is dispersed in an operating trapping gas or liquid particulate matter is heterogeneous material separation. Filtering through the filter media and filtration equipment to complete, the company said filter media for the filter material goods, it is textiles categories very important part. Plays an important role by filtering pollution control, protection of the atmospheric environment, play to ensure product quality in industrial production, improve the technical accuracy of the product, recover valuable raw materials and reduce costs.

1, the filter in the form of classification: the fiber products for the filtration filter material can be broadly divided into dry and wet filtration filter two categories. Dry Filtration is the process of the gas floating style suspended solid particles, dust in the air separation, also known as gas-solid separation. Industrial processes, bag filter, building ventilation air filters in, belong to the gas - solid separation (filter) category. Wet process liquid filtration is floating or suspended solids removed from the liquid. 1. Dry Filtration: the density of the material to be filtered by size, can be divided into storage type filter (disposable filter) and a clean filter (recycling filter). 1) storage type filter is the case for low-density dust, air-conditioning and ventilation systems supporting the filter material, generally with fluffy fiber batt, a porosity of more than 90% to 99%, occurred in only isolated particles inner fibrous layer, these materials once they reach the dust filter saturation would need to be replaced to resolve the problem of increased resistance. 2) Clean the filter: it applies to separate high density of dust, that dust concentration of solid particles of magnitude up to several hundred grams per cubic meter occasion, generally used in the non-woven fabric filter porosity between 70% to 90% It occurs in the initial stage of filtration of particles inside the fiber layer separated into surface soon after the occurrence of particle separation, dust layer cake formation itself plays the role of an efficient filtration, filtration efficiency up to 99.9%, because the cake the formation of resistance increased, the need for periodic cleaning.

2. Wet filter: wet filter surface of the filter material can be divided by the cross-sectional bar of solid particles, and the formation of a cake within the filter cake and the filtration process trapped solid particulate material depth filtration process. Driving force can be divided according to gravity filtration, vacuum filtration, pressure filtration and centrifugation several species. 1) belt filter supporting acupuncture rolling non-woven mat and woven filter, belt filter medium to high strength, small elongation, peel cake is good. At present, China in the belt filter medium for use in woven class-based. 2) there is a continuous vacuum filter vacuum filter and non-continuous type. 3) pressure filtration type many, frame, box-type, pressure blades and other forms, which have manual and automated operation, this kind of filtration equipment filter material requirements for high strength, stiffness appropriate for the cake The peel is better. 4) The screw extrusion press filter includes a filter press and squeeze belt filter. 5) centrifugal filter required filter must have a high abrasion resistance, the general fiber composite article of thick twill woven filter.