PROBLEM TO BE SOLVED: To provide a filter medium for a pleat filter having low ventilation resistance, having excellent peeling strength and combustibility, and having no peeling and breaking upon pleat working.SOLUTION: Provided is a filter medium for air cleaning including active carbon and a thermoplastic resin between cover layers on the upstream side and on the down stream side, in which the stocks of fibers composing the cover layers on the upstream side and on the downstream side are different, the thermoplastic resin is made of two or more kinds of stocks, and at least one kind of the stocks of the fibers and the thermoplastic resin is made of a polyester resin.COPYRIGHT: (C)2014,JPO&INPIT【課題】低通気抵抗で剥離強度、燃焼性に優れプリーツ加工時の剥離や破れが無いプリーツフィルタ用濾材を提供する。【解決手段】上流側と下流側のカバー層間に活性炭と熱可塑性樹脂を含む空気清浄用濾材であって、上流側と下流側のカバー層を構成する繊維の素材が異なり、熱可塑性樹脂が2種類以上の素材からなり、カバー層を構成する繊維の素材および熱可塑性樹脂の少なくとも1種がポリエステル系樹脂である空気清浄用濾材。【選択図】なし
