| 摘要 |
PURPOSE: To obtain a tubular formed article having excellent filtration performance, pressure resistance and water-permeability and suitable as a filter or a draining material by winding a spun-bonded web composed of a multi-component conjugate filament around a core while heating the web above the heat-welding temperature of the web. CONSTITUTION: A conjugate spun-bonded web composed of two components having a fineness of 0.2-300d/f or 17-70,000d/f and the maximum/minimum fineness ratio of >=1.5 is produced by the conjugate spinning of 10-90wt.% of a low-melting resin component selected from polyethylene, a crystalline copolymer ofα-olefins such as propylene and butene-1 and a low-melting polyester and 90-10wt.% of a high-melting resin component (the melting point difference between the low-melting resin and the high-melting resin is >=10 deg.C) such as polypropylene or polyethylene terephthalate in such a manner as to form at least a part of the fiber surface with the low-melting resin component and taking-up the spun fiber through an air sucker at a take-up speed of 500-20,000m/min under quenching at a rate of 0.1-5m/sec. The web or the web and other fibers such as polyamide are laminated or mixed in layers and the formed web is wound around a core under heating at or above the welding temperature of the low-melting component to obtain the objective tubular formed article.
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