<section data-role="outer" class="article135" label="edit by 135editor"><section class="_135editor" data-role="title" data-tools="135编辑器" data-id="113455"><section style="margin: 20px auto;"><section style="display: flex;justify-content: center;align-items: center;"><section><section style="display: flex;justify-content: flex-start;align-items: flex-end;"><section style="width: 35px; margin-bottom: -1px;"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 58.77 20.5" style="display: block;" xml:space="default"><g><g><path class="cls-1" style="fill:none;stroke:#ddba76;stroke-miterlimit:10;" d="M.5.5H48.1c3.5,0,6.34,2,6.34,4.5h0c0,2.49-2.84,4.5-6.34,4.5H6.85C3.34,9.5.5,11.51.5,14v1.5C.5,18,3.34,20,6.85,20H58.77"></path><path class="cls-1" style="fill:none;stroke:#ddba76;stroke-miterlimit:10;" d="M3.5.5H51.1c3.5,0,6.34,2,6.34,4.5h0c0,2.49-2.84,4.5-6.34,4.5H9.85c-3.51,0-6.35,2-6.35,4.5v1.5C3.5,18,6.34,20,9.85,20H53.77"></path></g></g></svg></section></section><section style="padding: 0px 6px;"><section style="padding: 5px 0px; border-top: 1px solid rgb(221, 186, 118); display: flex; justify-content: center; align-items: center; border-bottom: 1px solid rgb(221, 186, 118);"><section class="box-edit _135editor" style="font-size: 16px; color: rgb(40, 100, 50); text-align: center; padding: 2px 5px;"><strong class="135brush" data-brushtype="text">氨 纶 包 覆 纱</strong></section></section></section><section style="display: flex;justify-content: flex-end;align-items: flex-start;"><section style="width: 35px; margin-top: -1px;"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 58.77 20.5" style="display: block;" xml:space="default"><g><g><path class="cls-1" style="fill:none;stroke:#ddba76;stroke-miterlimit:10;" d="M.5.5H48.1c3.5,0,6.34,2,6.34,4.5h0c0,2.49-2.84,4.5-6.34,4.5H6.85C3.34,9.5.5,11.51.5,14v1.5C.5,18,3.34,20,6.85,20H58.77"></path><path class="cls-1" style="fill:none;stroke:#ddba76;stroke-miterlimit:10;" d="M3.5.5H51.1c3.5,0,6.34,2,6.34,4.5h0c0,2.49-2.84,4.5-6.34,4.5H9.85c-3.51,0-6.35,2-6.35,4.5v1.5C3.5,18,6.34,20,9.85,20H53.77"></path></g></g></svg></section></section></section></section></section></section><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><span style="font-size: 15px;">&nbsp; &nbsp; &nbsp; &nbsp;氨纶包覆纱(Covered Spandex Yarn)，一般有单包、双包等包覆形式。其中锦氨、涤氨多以单包的方式包覆居多。</span></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><br></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><span style="font-size: 15px;">　　空气包覆纱（简称空包，英文缩写为ACY）是将外包纤维长丝与氨纶丝同时牵伸经过一定型号喷嘴，经高压缩的空气规律性的喷压形成节律性的网络点的纱线。其织物手感柔软滑爽；机械包覆纱（简称机包，英文缩写为SCY）是将外包纤维长丝不断的旋转并缠绕在被匀速牵伸的芯丝氨纶上，是经加捻而具有捻度（英文缩写为TPM）的，织物风格平整挺括是其主要特点。</span></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><br></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><span style="font-size: 15px;">　　空包机包纱线在下游织厂织造各有优劣。空包在喷气织机上整经时一般需要上浆，否则织物易起毛断丝等，但打纬就可以直接使用。单从成本考虑，空包产能大大高于机包产能使得价格比机包更低，便于降低下游织厂的成本。机包尽管不外露芯丝，一般除捻度不匀外不易产生纺纱和织造时的质量问题，但产量低，价格因此比同规格的空包高RMB5000/T以上，细旦包覆纱的价格甚至高于同规格的空包RMB10000/T以上，因此大大增加了使用机包的成本。</span></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><br></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><span style="font-size: 15px;">　　在纺纱过程中，氨纶的预牵伸倍数（Spandex?Stretch）是一项重要的工艺参数，它影响包覆纱（Covered?Yarn）及织物的弹性，又影响包覆纱的强伸度，条干均匀度和蠕变性能。氨纶的预牵伸倍数过小，不能充分发挥弹力织物面料弹性好的优势，牵伸过高时纺纱困难，又容易引起断丝，产品质量随之下降；另外氨纶丝的百分含量也影响包覆纱的弹性，含量高，弹性好。在氨纶丝规格一定的情况下，增大牵伸倍数，氨纶丝的百分含量降低，即氨纶的预牵伸倍数与成纱氨纶的百分含量成反比。</span></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><br></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><span style="font-size: 15px;">　　包覆纱的强伸度随氨纶预牵伸倍数增大而增大，在牵伸到一定数值后，氨纶丝的回缩性使外包纤维呈卷曲状态，氨纶芯丝被拉直；适当增大预牵伸倍数，氨纶百分含量降低，外包纤维卷曲程度大。但当牵伸过大，氨纶丝变形幅度接近变形的临界值，就会使包覆纱强伸度下降，但有利于包覆纱条干均匀。</span></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><br></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><span style="font-size: 15px;">　　在恒定牵伸力作用下变形随时间变化的现象我们称之为蠕变。包覆纱在氨纶丝预牵伸3.5倍时，抗蠕变性能最好。</span></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><br></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><span style="font-size: 15px;">　　机包的捻度影响纱的质量，强伸度和条干均匀度。增大捻度，可以增加外包纤维与氨纶丝之间的抱合力，使得包覆纱强力提高。机包的伸长率主要由氨纶芯丝性能所决定，捻度过大，外层纤维包覆过于紧密，氨纶丝的弹性效果反而不能充分发挥，使伸长率下降。随着捻度增加，条干均匀度有所改善。捻度过小，外包纤维松散，在纺纱过程中，由于摩擦等原因纤维沿纱线轴向会微微移动，故条干有所恶化。</span></p><p style="vertical-align: inherit; margin-bottom: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;"><br></p><section style="margin: 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; color: rgb(47, 45, 45); font-family: Arial, 微软雅黑, &quot;Microsoft yahei&quot;;" class=""><span style="font-size: 15px;">　　机包中氨纶丝的存在会削弱外包纤维丝之间的抱合力，捻度过低，外包纤维松散，影响包覆效果，出现露芯现象，因此机械包覆时捻度应偏高。但捻度过高，织物手感发硬，悬垂性差。一般捻度随纱的旦尼数的变化要有所调整，比如N40D+20D机包，捻度为600捻为好，而N70D+40D或T150D+40D机包捻度控制在480左右就可以了，有些小型纺纱厂出于交期和降低生产成本考虑，会采用降低捻度或提高设备转速从而提高产量，是不利于包纱质量的。</span></section><section class="_135editor" data-role="paragraph"><p style="vertical-align:inherit;"><br></p></section></section>