| 摘要 |
PROBLEM TO BE SOLVED: To provide a canister filter structure body of which equipment is simple as a canister filter structure body for a small engine, through which activated carbon particles does not pass but ventilation can be done easily, and which prevents gasoline vapor from flowing out to the atmosphere. SOLUTION: This canister filter comprises non-woven fabric 1, 2 which are layered bodies of two or more short fiber layers, have density difference, have a layer structure containing hydrophilic fiber as a main body in at least a dense layer part 1a and have resin treatment applied on whole bodies of the layered bodies, and have 40 Pa or higher ventilation resistance, 5.0 kPa or higher burst strength, and 1.0 N/cm<SP>2</SP>(100%) or higher initial compression coefficient of elasticity, and the same can be attached to a fuel tank as a structure body A with putting activated carbon 3 between the non-woven fabric. The fabric constructing the short fiber layer comprises single or mixed fiber of hydrophobic fiber or hydrophilic fiber. Mixed fiber of fibers having different fineness is suitable. COPYRIGHT: (C)2008,JPO&INPIT
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