高密度聚乙烯熔纺纤维的拉伸工艺

相对分子质量为１４万的高密度聚乙烯（ＨＤＰＥ）通过螺杆挤出机熔纺成形，然后经过高温超拉伸可制成强度为９．７ｃＮ／ｄｔｅｘ的中强聚乙烯纤维。讨论了拉伸温度、拉伸比对纤维力学性能的影响，并通过声速取向、热分析（ＤＳＣ）、广角Ｘ射线衍射（ＷＡＸＤ）和纤维力学性能的测试研究了拉伸过程中聚乙烯纤维结构与性能的变化。结果表明：拉伸温度对纤维稳定拉伸影响较大，最佳温度为１０５～１１５℃；且初生纤维的纤度越小，高倍拉伸纤维强度越大，随拉伸倍数的提高，纤维的强度和声速取向都显著提高并改善了纤维的热性能和力学性能，但断裂伸长却呈下降趋势。

DRAWING PROCESS OF MELT\|SPUN HDPE FIBERS

High density polyethylene(MW=14105) is melt\|spun by screw extruder and then super\|drawn at high temperature to produce media strength PE fibers with the tensile strength of 97cN/dtex. The effects of drawing temperature and draw ratio on the mechanical properties of PE fibers were discussed. Moreover, the changing of structure and properties of PE fibers during drawing were studied by means of sound pulsimeter, DSC, WAXD and tensile tester.The results showed that drawing temperature greatly influenced the steady drawing of fibers;the optimal drawing temperature was 105￣115;the thinner the fineness of as\|spun fibers were,the higher the tensile strength of PE fibers drawn at high ratio were;as the draw ratio increased,the tensile strength and sound orientation were increased and the thermal and mechanical properties of PE fibers were improved,but the breakage elongation decreased.