AIR FILTER MEDIUM PRODUCTION METHOD AND AIR FILTER PRODUCTION METHOD

To provide methods for safely producing an air filter medium and an air filter that achieve improved filtering performance, in particular, particle capturing performance.SOLUTION: An air filter medium production method according to the present disclosure comprises: an attachment step of attaching a water-soluble polymer solution which contains a water-soluble polymer and a solvent to a supporting body having fluid permeability; and a reduced-pressure drying step of subjecting the supporting body having undergone the attachment step to reduced-pressure drying. The reduced-pressure drying step is a step of setting temperature in a chamber to 0°C to 50°C inclusive, and forming a mesh network of the water-soluble polymer solution in pores of the supporting body and/or an outer surface of the supporting body.SELECTED DRAWING: Figure 1 【課題】本開示は、フィルタ性能、特に粒子捕集性能を向上させたエアフィルタ用濾材及びエアフィルタを安全に製造する方法を提供することを目的とする。【解決手段】本開示に係るエアフィルタ用濾材の製造方法は、流体透過性を有する支持体に、水溶性高分子と溶媒とを含む水溶性高分子溶液を付着させる付着工程と、該付着工程を経た前記支持体を減圧乾燥させる減圧乾燥工程と、を含み、該減圧乾燥工程は、チャンバ内の温度を０℃以上５０℃以下とし、かつ、前記支持体の孔内及び／又は前記支持体の外表面に前記水溶性高分子の網目状ネットワークを形成する工程である。【選択図】図１