FILTER MEDIUM FOR AIR FILTER

摘要

PROBLEM TO BE SOLVED: To provide a filter medium for an air filter which has an extremely low pressure loss, is most suitable for air filtration treatment at a high air flow and can collect fine dust at a high efficiency.

SOLUTION: The filtering medium for the air filter has a nano fiber structure layer composed of three-dimensionally entangling nano fibers with a fiber diameter of 300 nm or smaller, and the nano fiber structure layer satisfies the condition of a following expression 1: 0.0004×D+0.0944≤W≤0.0004×D+0.1944, wherein D is the average fiber diameter (nm) of the nano fiber structure layer and W is the basis weight (g/m2) of the nano fiber structure layer.

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