Effect of draw process on the structure and properties of fishery polyethylene fibers

High density polyethylene produced by Qilu Petrochemical Engineering Co.Ltd was melt-spun by screw extruder and then multi-step drawn at high temperature to fabricate high performance fishery PE fibers.It was showed that when the draw ratio was 8.17 in the one-step process,the breaking strength and knot strength of the PE fiber were 5.71cN/dtex and 4.56cN/dtex,respectively; but when the first and total draw ratio were 8.17 and 9.52 in the two-step process,the breaking strength and knot strength were 7.91cN/dtex and 5.24cN/dtex,which were 41.3% and 34.4% higher than the high-class products specified in the national standard,respectively.It was found that the PE fibers fabricated by two-step process showed more regular macromolecular chains,higher orientation and better fishery properties than those fabricated by one-step process.In addition,with the total draw ratio increased,the breaking strength,sound orientation and thermal properties were improved,but the knot strength increased first and subsequently decreased.