초록 ▼

The group of particles for air filter inspection consists of a plurality of aggregate particles having a particle size of not less than 0.1 .mu.m, each aggregate particle being constituted by solid primary particles having an average particle size of less than 55 nm. Further, the inspection method f

The group of particles for air filter inspection consists of a plurality of aggregate particles having a particle size of not less than 0.1 .mu.m, each aggregate particle being constituted by solid primary particles having an average particle size of less than 55 nm. Further, the inspection method for an air filter has the steps of: producing the group of particles by atomizing and drying a suspension containing the solid primary particles having the average particle size of less than 55 nm, introducing the group of particles into the upstream side of the air filter, and detecting any of the group of particles leaked out of the downstream side of the air filter with a particle detector.

대표청구항 ▼

[ What is claimed is:] [12.]12. An inspection method for an air filter comprising the steps of:Generating a group of particles containing a plurality of aggregate particles each constituted by a plurality of solid primary particles by atomizing and drying a suspension containing the plurality of sol

[ What is claimed is:] [12.]12. An inspection method for an air filter comprising the steps of:Generating a group of particles containing a plurality of aggregate particles each constituted by a plurality of solid primary particles by atomizing and drying a suspension containing the plurality of solid primary particles having an average particle size of less than 55 nm and each of the aggregate particles having a major-minor axis ratio within a range of 1.0 to 1.4; introducing the group of particles thus generated into an upstream side of said air filter; and detecting any of the group of particles which are leaked out of a downstream side of the air filter by using a particle detector.