PROBLEM TO BE SOLVED: To provide a filter material for a pleated filter with a low ventilation resistance and a large dust holding amount, and with a small amount of dropping activated charcoal in a pleating process.SOLUTION: The air cleaning filter material includes activated charcoal and thermoplastic resin between cover layers. The air cleaning filter material is made from palm shell activated charcoal whose average particle size is 400-800 μm and whose hardness by JIS K 1474 is at least 90%. The average fiber diameter of fibers constituting a cover layer on the upstream side is 20-100 μm.COPYRIGHT: (C)2013,JPO&INPIT【課題】低通気抵抗でダスト保持量が大きく、プリーツ加工時の活性炭脱落が小さいプリーツフィルタ用濾材を提供する。【解決手段】カバー層間に、活性炭及び熱可塑性樹脂を含む空気清浄用用濾材であって、活性炭が平均粒径400~800μm、かつJIS K 1474による硬さが90%以上のヤシ殻活性炭からなり、上流側カバー層を構成する繊維の平均繊維径が20~100μmである空気清浄用濾材。【選択図】なし
