| 摘要 |
A nonwoven fabric air filter for internal combustion engine produced by forming multiple layers composed mainly of polyester binder fibers of 1 to 10 mm fiber length according to airlaid nonwoven fabric production process and effecting thermal bonding thereof. In particular, a thin uniform nonwoven fabric air filter for internal combustion engine with pleats configuration, having an upper layer side (fluid inflow side) composed of thick fibers, having a lower layer side (fluid outflow side) composed of thin fibers, and having a last fluid outflow side layer composed 100% of polyester binder fibers, which thin uniform nonwoven fabric air filter is comprised of airlaid nonwoven fabrics whose weight per square meter, apparent density and dry- heat shrinkage factor after 300 hr at 100°C are 100 to 350 g/m 2, 0.04 to 0.3 g/cm3 and 3% or less, respectively. This thin uniform nonwoven fabric air filter is free from environmental pollution, realizes high dust collection efficiency and ensures prolonged life.
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