<section data-role="outer" class="article135" label="edit by 135editor"><section data-role="outer" label="Powered by 135editor.com" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; color: rgb(34, 34, 34); letter-spacing: 0.544px; text-align: justify; font-size: 16px; visibility: visible; font-family: 微软雅黑; overflow-wrap: break-word !important;"><section data-id="us158593" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; border-color: currentcolor; border-style: none; border-width: 0px; visibility: visible; overflow-wrap: break-word !important;" class="_135editor"><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; line-height: 2em; visibility: visible; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; visibility: visible; overflow-wrap: break-word !important;">要做到细纱前罗拉钳口握持稳定不打滑，即不出“硬头”，似乎在现有条件下很难做到。从牵伸理论角度看，不出“硬头”就是处理好握持力与牵伸力或者引导力与控制力的矛盾。在牵伸过程中只要做到最小握持力始终大于最大牵伸力，前钳口线上浮游纤维引导力始终大于控制力，即属于比较理想的牵伸状态。高弹性是胶辊低硬度的基础，否则会产生塑性变形；但按现有技术，丁腈橡胶无法做到更小硬度（目前无法做到低于邵尔A60度）下的弹性恢复。聚氨酯胶辊硬度可以做到邵尔A55度，弹性恢复好于现有丁腈橡胶胶辊且更加耐磨，回磨周期可提高3～4倍，表面粗糙度可适当偏高且不影响条干和抗绕效果。对集聚纺而言，这种性能要求更高，因为集聚纺设备没有清洁辊，所以绕花对其成纱质量影响较大。</span></p></section></section><p style="margin-bottom: 0.1px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; letter-spacing: 0.544px; text-align: justify; text-indent: 0em; font-size: 16px; color: rgb(62, 62, 62); line-height: 24px; font-family: 微软雅黑; overflow-wrap: break-word !important;" align="justify"><br></p><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); letter-spacing: 0.544px; text-align: justify; font-size: 16px; font-family: 微软雅黑; overflow-wrap: break-word !important;" align="justify"><br></p><section data-custom="rgb(255, 235, 240)" data-color="rgb(255, 235, 240)" data-tools="135编辑器" data-id="85690" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; color: rgb(34, 34, 34); letter-spacing: 0.544px; text-align: justify; font-size: 16px; border-width: 0px; border-style: none; font-family: 微软雅黑; overflow-wrap: break-word !important;" class="_135editor"><section style="margin: 0px auto; padding: 0px; outline: 0px; max-width: 100%; overflow-wrap: break-word !important;"><section style="margin: 0.8em 0px 0.5em; padding: 0px 6px 0px 0px; outline: 0px; max-width: 100%; border-width: medium; border-style: none; text-align: center; color: inherit; overflow-wrap: break-word !important;"><section data-bgless="darken" data-bglessp="10%" style="margin: 0px; padding: 0px 0px 6px; outline: 0px; max-width: 100%; display: inline-block; color: rgb(184, 0, 47); background-color: rgb(255, 184, 202); overflow-wrap: break-word !important;"><section style="margin: -6px -6px 0px 6px; padding: 5px 15px; outline: 0px; max-width: 100%; display: inline-block; vertical-align: top; font-size: 1.2em; text-decoration: inherit; color: inherit; border-color: transparent; background-color: rgb(255, 235, 240); font-family: inherit; overflow-wrap: break-word !important;"><section data-brushtype="text" style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; color: inherit; border-color: rgb(255, 235, 240); overflow-wrap: break-word !important;">实际生产中如何强化前罗拉与胶辊的握持？</section></section></section><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; width: 0px; height: 0px; clear: both; color: inherit; overflow-wrap: break-word !important;"><br style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; overflow-wrap: break-word !important;"></section></section></section></section><p style="margin-bottom: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; color: rgb(34, 34, 34); letter-spacing: 0.544px; text-align: justify; font-size: 16px; font-family: 微软雅黑; overflow-wrap: break-word !important;" align="justify"><br></p><p style="margin-bottom: 0.1px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; letter-spacing: 0.544px; text-align: justify; text-indent: 0em; font-size: 16px; color: rgb(62, 62, 62); line-height: 2em; font-family: 微软雅黑; overflow-wrap: break-word !important;" align="justify"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; overflow-wrap: break-word !important;">目前，广泛采用的低硬度高弹性胶辊在柔性工艺下基本能够满足要求。但某些厂采取过紧的隔距以平衡牵伸力，使前胶辊过度加压，出现某些论文中提到的涂料配比越浓条干反而越好的反常现象。这种握持力增加过多而牵伸力并未同步增加，反而造成胶辊弹性恢复不良，反包围弧延伸使变速点位移变化，破坏条干<em style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; overflow-wrap: break-word !important;">CV</em>值，增加锭差。此外，现有牵伸装置工艺上往往存在喂入定量过大，牵伸倍数过大，导致纱疵、毛羽相应增加；隔距块或者隔距块控制棒过小也会造成短粗竹节相应增加。</span></p><p style="margin-bottom: 0.1px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; letter-spacing: 0.544px; text-align: justify; font-size: 16px; color: rgb(62, 62, 62); text-indent: 32px; line-height: 24px; font-family: 微软雅黑; overflow-wrap: break-word !important;" align="justify"><br></p><p style="margin-bottom: 0.1px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; letter-spacing: 0.544px; text-align: justify; text-indent: 0em; font-size: 16px; color: rgb(62, 62, 62); line-height: 2em; font-family: 微软雅黑; overflow-wrap: break-word !important;" align="justify"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; overflow-wrap: break-word !important;">较为理想的握持状态是在前上胶辊做到“光、滑、爽、燥”的前提下，表面粗糙度可以偏大掌握，以表面粗糙度<em style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; overflow-wrap: break-word !important;">Ra</em>值小于1.0&nbsp;<em style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; overflow-wrap: break-word !important;">μ</em>m为准，即胶辊硬度满足牵伸中弹性恢复要求，如采用低硬度聚氨酯胶辊。此外，如果前罗拉制造技术获得突破：即将现有斜齿改为人字交叉齿使前胶辊摩擦传动力得到左右平衡，或者在钳口工作面覆盖耐磨半弹性体，使上下均为弹性握持，可使前档压力在更小的条件下实现可靠握持。保持前钳口稳定的另一个重要条件是上、下胶圈控制纤维的稳定性，即运用可靠的器材做到上、下胶圈运行同步、无滑溜，即可满足纺纱牵伸稳定性要求。</span></p></section>