DEODORIZING FILTER MATERIAL AND PREPARATION THEREOF

摘要

PURPOSE:To obtain a deodorizing filter material having good air permeability by forming the deodorizing filter material containing 50-97wt.% of an activated carbon fiber based on the weight of sheet and having a basis wt. of 50-300g/m<2> and density of 0.08g/cm<3> or less by a wet papermaking process. CONSTITUTION:A conjugate fiber consisting of a core component composed of a high m.p. synthetic resin and a sheath component composed of a low m.p. synthetic resin and an activated carbon fiber are used as essential components and an aqueous slurry containing these fibers is formed into a sheet by a wet papermaking process and the sheet is dried at temp. higher than the m.p. of the sheath component but lower than the m.p. of the core component to fuse the activated carbon fiber and the conjugate fiber. The obtained sheet is heat- treated at temp. higher than the drying temp. and lower than the m.p. of the core component of the conjugate fiber to obtain a deodorizing filter material containing 50-97wt.% of activated carbon fiber based on the weight of the sheet and having a basis wt. of 50-300g/m<2> and density of 0.08g/cm<3> or less. Since this filter material is formed by a wet papermaking process, the yield of the material is well and excellent air permeability is obtained.