Multilayer filter material of filter element for liquid filtration, has main portion that is provided with pre-filter layer, main filter layer and absolute hydrophilic or hydrophobic filter layer

摘要

The multilayer filter material has a main portion provided with a pre-filter layer, a main filter layer and an absolute hydrophilic or hydrophobic filter layer. The pre-filter layer is made of wet or dry non-woven fabric material. The main filter layer is made of wet non-woven fabric material comprising cellulose fiber, synthetic fiber, inorganic fiber or a mixture of fibers. The absolute filter layer is made of melt-blown non-woven fabric material. The pre-filter layer is provided with a filter paper.