<div><br></div><div><section class="_135editor" data-role="paragraph" style="max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;">　　纱线条干不匀率的测试方法有很多种，这里仅介绍两种常用的简单方法。</p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;">　　1．切断称重法&nbsp; 用缕纱测长器取得一定长度的绞纱若干绞，每一绞称为一个片段，分别称得每一绞纱线的重量，即得到Xi，代入式(2—12)求得重量不匀，代入式(2—13)求得片段间不匀。片段长度按规定棉型纱线为100m，箱梳毛纱为50m，精梳毛纱为20m，苎麻纱49tex及以上为50m、49tex以下为100m，生丝为450m。</p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;">　　2．目光检验法&nbsp; 又称黑板条干法。它是将纱线用绕黑板机以一定密度均匀绕在一定规格的黑板上，然后将黑板放在暗室内规定的光线和位置下，用目光观察黑板的阴影、粗节、严重疵点等情况，与标准样照进行对比，确定纱线的条干级别。棉纱线的条干级别分为优等、一等和二等，二等外的为三等。毛纱线评定条干一级率。目光检验法测试的纱线条干不匀，反映的是纱线的短片段的表现粗细不匀，测试快速、简单，但不能得到定量的数据，而且测试结果会因人而异。图2—7是不同细度纱线的两块黑板，可以看到疵点、毛羽以及条干不匀的差异。图2—8是YG381型摇黑板机。</p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br></p></section></div><div style="text-align: center; "><img src="http://dayaotex-img.gz.bcebos.com/article/fffspic/fzmlsj1399.png"></div><div style="text-align: center; "><br></div>