PREPARATION OF POLYAMIDE MONOFILAMENT

    公开(公告)号:JPS57139513A

    公开(公告)日:1982-08-28

    申请号:JP2223281

    申请日:1981-02-19

    Abstract: PURPOSE:To obtain the titled monofilament having a high knot strength, by heat-treating a drawn polymaide monofilament under no tension, drawing the heat-treated monofilament in the second stage, and heat-treating the secondarily drawn monofilament under specific conditions successively. CONSTITUTION:A polyamide monofilament, having a diameter of 0.05-2mm., and drawn at a draw ratio of 3-5 in the first drawin stage is led to a pressurized chamber fed with saturated steam at a pressure >=1kg/cm .G, and heat-treated at a draw ratio of 0.70-1.0 for 0.05-5sec under no tension. The resultant heat- treated monofilament is then drawn at a draw ratio of 1.1-2.5 while being passed through a gas at 200-800 deg.C and/or a liquid at 150-265 deg.C for the total time of 0.05-5sec in the second stage. The secondarily drawn monofilament is further heat-treated in an inert gas at 150-700 deg.C at a draw ratio of 0.85-1.0 under no tension to give the aimed monofilament having an orientation degree of amorphous molecules in the surface layer =50X10 .

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