PROBLEM TO BE SOLVED: To provide a filter material which has rigidity such that a sheet, having a low pressure loss, high deodorizing performance and high dust retention, maintains adequate adhesion strength and also can be processed in pleated shape by a pleating machine.SOLUTION: A filter material is produced by laminating granular active carbon and a granular binder between two layers of nonwoven fiber, wherein the tensile strength of the filter material in both the longitudinal direction and the lateral direction is ≥50 N/5 cm and the ratio of the tensile strength in the longitudinal direction and the lateral direction is 1.0:1.5 to 1.5:1.0.COPYRIGHT: (C)2013,JPO&INPIT【課題】低圧力損失、高脱臭性能、高粉塵保持量であるシートを充分な接着強力を維持し、かつ、プリーツ加工機によってプリーツ形状に加工できる剛性を有するフィルターろ材を提供する。【解決手段】2層の不織布の間に粒状活性炭及び粒状バインダーを積層してなるフィルターろ材であって、フィルターろ材の縦方向および横方向の引張強度が共に50N/5cm以上であり、縦方向と横方向の引張強度の比が1.0:1.5~1.5:1.0であるフィルターろ材。【選択図】なし
