Patent ID: 7416585

Claim:
A fuel vapor adsorption filter for mounting within an intake air channel connected to an engine and extending across the intake air channel in order to absorb a fuel vapor within the intake air channel when the engine has been stopped, the fuel vapor adsorption filter comprising: an adsorbing agent for adsorbing the fuel vapor; a holding layer comprising a first non-woven fabric and arranged and constructed to contain and hold the adsorbing agent wherein the first non-woven fabric is formed of thermoplastic resin fibers; a cover layer comprising a second non-woven fabric and arranged and constructed to cover at least one side of the holding layer opposing the downstream side of the intake air channel, wherein the second non-woven fabric is formed of thermoplastic resin fibers; wherein the thermoplastic resin fibers forming the second non-woven fabric of the cover layer have an average diameter between 100 μm and 330 μm; wherein an average diameter of the thermoplastic resin fibers of the second non-woven fabric is between 110 μm and 150 μm; and wherein a weight per unit area of the second non-woven fabric is between 180 g/m 2 and 270 g/m 2 .