乙纶单丝捻线延伸性的研究

本项试验是研究乙纶(PE之一种)单丝捻制成的网线在外力小于断裂强力作用下所产生的变形特性(即延伸性)。网线的延伸性包括伸长、韧性和弹性三方面。本文的主要内容有：1．通过对乙纶网线结节(单死结)和无结拉伸断裂测试，得到了乙纶网线在1／2结节断裂强力作用下的伸长值；2．通过乙纶网线拉伸断裂试验时的拉伸曲线用三次样条函数(自然样条函数)插值法计算了网线的韧度和系数Q值，并编制了计算机程序；3．通过对乙纶网线定伸长弹性试验，计算在不同恢复时间下的弹性恢复率，从而得到定伸长弹性恢复率与网线直径和恢复时间的关系．

THE EXTENSIBILITY OF YILUN(POLYTHYLENE)MONOFILAMENT NETTING YARNS

This paper deals with the study of extensibility of netting yarnsmade of Yilun folded monofilaments under the load below its breaking strength. Theextensible charateristic of these netting yarns includes elongation, toughness andelasticity. The results of experiment are as follows: 1. By breaking test, the elongation value of Yilun monefilament netting yarnsof the weaver's knot and the straight (knotless) acted under half knot breakingstrength is obtained. 2. The toughness and coeffecient (Q) by load-elongation curves were obtainedfrom breaking tests and by the insert value procedure of natural spline function. 3. The dergee of elasticity at various relaxed time is obtained by the elasticitytests under fixed elongation, then to get the relationships among the degree ofelasticity, diameter and relaxed time of the Yilun monofilament netting yarns.