Multifilament and braid

Multifilament and braid

  • CN 106,133,215 B
  • Filed: 03/13/2015
  • Issued: 10/23/2020
  • Est. Priority Date: 03/28/2014
  • Status: Active Grant
First Claim
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1. A method for producing a multifilament is characterized by comprising:

  • a dissolving step of dissolving polyethylene in a solvent to prepare a polyethylene solution;

    a spinning step of ejecting the polyethylene solution from a nozzle at a temperature of the melting point of the polyethylene or higher, and cooling the ejected yarn with a refrigerant of 10 ℃

    or higher and 60 ℃

    or lower;

    a drawing step of drawing while removing the solvent from the ejected undrawn yarn; and

    a winding step of winding the steel sheet at 50 ℃

    or lower with a tension of 5cN/dtex or lower,in the spinning step, the difference between the maximum temperature and the minimum temperature of each fine hole of the nozzle is 8 ℃

    or less, the coefficient of variation CV'"'"' of the discharge amount of each fine hole, i.e., (standard deviation of the discharge amount of all fine holes provided in the spinneret)/(average value of the discharge amount of all fine holes provided in the spinneret) ×

    100 is 20% or less,the number of times of stretching in the stretching step is 1 to 3 times, the stretching ratio is 7.0 to 60 times, and the total of the stretching time is 0.5 to 20 minutes,the multifilament is a multifilament formed of 5 or more single yarns,the multifilament has an intrinsic viscosity [ eta ] of 5.0dL/g or more and 40.0dL/g or less and comprises a polyethylene having a repeating unit substantially composed of ethylene,the difference between the maximum value and the minimum value of the ratio of the intensity of the diffraction peak of the orthorhombic (200) plane to the intensity of the diffraction peak of the orthorhombic (110) plane in the cross section of the single yarn is 0.22 or less.

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