| abstract |
(57) [Problem] To provide an inexpensive filter having high smoke adsorption efficiency. SOLUTION: An alternate adsorption film 2 is placed on a glass fiber piece 30. 0 is formed. The alternating adsorption film 20 has a cavity structure (porous structure) into which the colloidal smoke particles S can enter, and has a PAH film (A1, A3, A5) having a positive charge and a PAA film having a negative charge. It has a structure in which films (B2, B4, B6) are alternately laminated. The smoke particles S that have entered the alternating adsorption film 20 are physically adsorbed by the Coulomb force of the PAH film or the PAA film, and the aldehyde molecules are chemically adsorbed on the PAH film. If the adsorption effect is reduced, washing with hot air or warm water can remove the physically adsorbed particles and substantially recover the filter. |