<section data-role="outer" class="article135" label="edit by 135editor"><section class="_135editor" data-tools="135编辑器" data-id="115440"><section style="margin: 20px auto;"><section style="background-color: rgb(243, 251, 255); padding: 15px;"><section style="display: flex;justify-content: flex-start;"><section class="assistant" style="width: 15px; height: 15px; background-color: rgb(128, 206, 255); overflow: hidden;"></section><section class="assistant" style="width: 15px; height: 15px; background-color: rgb(255, 213, 213); margin-left: 5px;"><br></section></section><section style="padding: 15px 0px 20px; border-bottom: 1px solid rgb(128, 206, 255);"><section data-autoskip="1" class="135brush" style="text-align: justify; line-height: 1.75em; letter-spacing: 1.5px; color: rgb(51, 51, 51); background: transparent;"><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-indent: 32px; line-height: 1.75em; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; word-wrap: break-word !important; overflow-wrap: break-word !important;" align="justify"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; line-height: 24px; font-size: 14px; font-family: 宋体; word-wrap: break-word !important; overflow-wrap: break-word !important;">胶辊直接对纱线质量有显著影响，大直径胶辊纺纱性能要优于小直径胶辊，这是因为在同等压力条件下，胶辊直径越大，胶辊与罗拉的接触面积会增大，对纤维的控制就得到加强，这是由于胶辊与罗拉的接触面积增大之后所产生的摩擦力界变大，缩小了浮游纤维的活动区域，使得变速点向前转移，纱线条干<em style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; word-wrap: break-word !important; overflow-wrap: break-word !important;">CV</em>值因此得到改善。胶辊直径越大，牵伸过程中对须条的握持就越充分、越稳定；采用大直径胶辊其成纱质量得到了明显改善，建议在生产中使用大直径胶辊，且不宜采用表面硬度过高的胶辊，通常情况下选择表面硬度在邵氏硬度65度左右的软弹性胶辊。</span></p><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-indent: 32px; line-height: 1.75em; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; word-wrap: break-word !important; overflow-wrap: break-word !important;" align="justify"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; line-height: 24px; font-size: 14px; font-family: 宋体; word-wrap: break-word !important; overflow-wrap: break-word !important;">可以发现：在细纱过程中，前区牵伸里面被控制截面的纤维数量较少，因此细纱牵伸区对纤维的控制都集中在有限的截面上，对纤维运动状态具有较强的控制力，因此改变前区牵伸倍数的大小对纱线的成纱均匀性影响相对小一些，实验中我们重点考虑如何对后区牵伸进行工艺优选和配置。</span></p><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-indent: 32px; line-height: 1.75em; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; word-wrap: break-word !important; overflow-wrap: break-word !important;" align="justify"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; line-height: 24px; font-size: 14px; font-family: 宋体; word-wrap: break-word !important; overflow-wrap: break-word !important;">后区牵伸工艺参数的合理配置对纱线质量具有较大影响，目前生产中普遍采用小的后区牵伸倍数，机织用纱后区牵伸倍数一般为1.20倍～1.40倍，针织用纱后区牵伸倍数一般为1.04倍～1.30倍。本文所用后区罗拉中心距为55 mm，其中中、后罗拉直径均为25 mm，中后罗拉隔距30 mm，粗纱捻系数114，此种工艺设置所得到的纱线不仅成纱条干好、还可以减小车间工人的改车时间；当后区牵伸倍数在小范围内变动或棉纤维长度变化不大时，不需要调整隔距，这便于日常生产管理。</span></p><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); font-size: 17px; letter-spacing: 0.544px; text-indent: 32px; line-height: 1.75em; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; word-wrap: break-word !important; overflow-wrap: break-word !important;" align="justify"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; line-height: 24px; font-size: 14px; font-family: 宋体; word-wrap: break-word !important; overflow-wrap: break-word !important;">随着后区牵伸倍数变小，纱线条干<em style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; word-wrap: break-word !important; overflow-wrap: break-word !important;">CV</em>值呈现出先变小后变大的趋势，后区牵伸倍数与细纱机本身固定的牵伸牙齿轮有直接联系，实际生产中应根据不同型号的细纱机配置以及粗纱捻系数合理选择牵伸倍数，一般实际生产中建议选择较小的后区牵伸倍数。</span></p><p style="vertical-align: inherit; line-height: 1.75em;"><br></p></section></section></section></section></section><section data-role="paragraph" class="_135editor"><p><br></p></section></section>