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AIR FILTER MATERIAL

20190184317 ยท 2019-06-20

    Inventors

    Cpc classification

    International classification

    Abstract

    Spun bond nonwoven fabric comprises, as constituting filament, conjugate polyester continuous filaments having a cross-sectional shape of a nearly Y4-like shape. The continuous filament is composed of a nearly V-shape portion 6 in the nearly Y4-like shape, formed from low melting point polyester, and the other nearly+shape portion 5 therein, formed from high melting point polyester. The continuous filaments are heat-bonded with each other by the low melting point polyester. The spun bond nonwoven fabric is bonded by a powder type or spider web type hot melt adhesive agent with the melt blown nonwoven fabric.

    Claims

    1-3. (canceled)

    4. A process for producing an air filter comprising: applying a powder type or spider web type hot melt adhesive agent in solid form on ultrafine fiber nonwoven fabric formed from ultrafine fibers having a fiber diameter of 1 to 5 micrometers; and placing polyester nonwoven fabric on the powder type or spider web type hot melt adhesive agent, the polyester nonwoven fabric formed from polyester continuous filaments having a fineness of not less than 10 dtex, a shape of the polyester continuous filament in a cross section has four parts, each part having: a first portion with a first end and a second end, and two convex portions that each extend from the first end of the first portion, the convex portions extending in different directions such that a concavity is formed between the convex portions, wherein the second ends of the four parts are interconnected, and the four parts are connected together such that a concavity is formed between each adjacent pair of the parts, and the polyester continuous filaments are heat-bonded with each other; and bonding the ultrafine fiber nonwoven fabric with the polyester nonwoven fabric by the powder type or spider web type hot melt adhesive agent, wherein the powder type or spider web type hot melt adhesive agent has a melting point lower than the melting points of the ultrafine fiber and the polyester continuous filament.

    5. The process according to claim 4, wherein the polyester continuous filament is a conjugate polyester continuous filament in which the convex portions are formed from low melting point polyester and the first portions are formed from high melting point polyester.

    6. The process according to claim 4, wherein the conjugate polyester continuous filaments are bonded to each other by heat bonding of the low melting point polyester.

    Description

    BRIEF DESCRIPTION OF DRAWINGS

    [0044] FIG. 1 is a cross sectional view of a continuous filament used in the invention.

    [0045] FIG. 2 is one nearly Y part in the nearly Y4 shape which is the cross sectional view of the continuous filament used in the invention.

    [0046] FIG. 3 is the Y4 figure of the nozzle orifice.

    [0047] FIG. 4 is one Y part in the Y4 figure of the nozzle orifice.

    REFERENCE SIGNS LIST

    [0048] 1 Bottom end of the nearly Y shape in a cross sectional shape of the continuous filament, [0049] 2 Concave portion formed in the nearly Y4 shape, [0050] 3 Convex portion formed in the nearly Y4 shape, [0051] 4 Small concave portion formed in the nearly Y4 shape, [0052] 5 Nearly+shape portion formed in the nearly Y4 shape, [0053] 6 Nearly V shape portion formed in the nearly Y4 shape, [0054] 7 Bottom end in the Y4 shape being a nozzle orifice when melt spinning, [0055] 8 custom-character part of the Y shape, [0056] 9 custom-character parts of the Y shape, [0057] 10 V part in the Y shape, [0058] 11 + part in the Y shape.