<section data-role="outer" class="article135" label="edit by 135editor"><section class="_135editor" data-tools="135编辑器" data-id="113597"><section style="margin: 20px auto;"><section><section style="margin: 0 15px;"><section style="background-color: #fffcf2;"><section style="padding: 20px 0px 0px 15px;"><section style="width: 15px;"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 66.2 50.05" style="display: block;" xml:space="default"><g><g><path class="cls-1" style="fill:#ffc635;" d="M16.2,18.05h0c-1.07,0-1.54-.95-1.58-2-.31-8,6.69-13,12.92-13.94C28.58,1.92,28.08,0,27,0-2.55,0-.22,30.43.23,34.59a16,16,0,0,0,16,15.46h0a16,16,0,0,0,16-16h0A16,16,0,0,0,16.2,18.05Z"></path><path class="cls-1" style="fill:#ffc635;" d="M50.2,18.05h0c-1.07,0-1.54-.95-1.58-2-.31-8,6.69-13,12.92-13.94C62.58,1.92,62.08,0,61,0,31.45,0,33.78,30.43,34.23,34.59a16,16,0,0,0,16,15.46h0a16,16,0,0,0,16-16h0A16,16,0,0,0,50.2,18.05Z"></path></g></g></svg></section></section><section><section style="padding: 10px 15px 20px;"><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="vertical-align: inherit; line-height: 1.75em;">1对断头率的影响<br>&nbsp;&nbsp;&nbsp;&nbsp;经丝从经轴出来到织成织物，要经过导辊、综丝、钢筘的几千次拉伸和摩擦，丝线上机张力增大，容易引起疲劳，在经丝的薄弱环节发生断裂，所以过大的上机张力是引起经丝断头的主要原因。有人曾对某一织物做过试验，调整经丝上机张力、综平度、经位置等相关因素，使经丝的断头率从0.839根/台·时，降低到0.175根/台·时。是否可以认为：上机张力越小，则断头率越低呢？经分析，一般织物上的打纬不是90°，因而其打纬力可分解为沿织物方向的力F和垂直织物方向的力f，当打纬力不变时，若经丝张力减小，则绸面方向的打纬力F势必降低，因而织物形成区及打纬区都将增加。这样，既增大了经丝在筘与综丝间的摩擦，又使经丝在钢筘前面产生了“臃塞”现象，从而导致断头增加，所以，过小的经丝上机张力对织造也是不利的。<br>2对织物缩率的影响<br>&nbsp;&nbsp;&nbsp;&nbsp;若经丝张力大，经、纬交织时，由于经丝压迫纬丝，致使纬丝的屈曲增大，因而纬丝的内应力增大。当织物卷入卷取辊，特别是下机后，经丝的张力消失，纬丝由于内应力的“抵抗”作用，将对经丝产生较大的反压力，从而形成经向缩率增大，纬向缩率减小的情况。<br>3对织物手感、外观的影响<br>&nbsp;&nbsp;&nbsp;&nbsp;经丝上机张力的大小，对织物的手感和外观效果的影响较大，若经丝上机张力控制恰当，织物的绸面平挺，织纹清晰，手感良好；而经丝张力过大由于伸长过度，绸面就不够丰满，而且经丝上机张力过大，织物很有可能产生“稀口档”。</p></section></section><section style="margin-top: -5px;"><section class="assistant" style="width: 100%; max-width: 100% !important;" data-width="100%"><img class="assistant" style="vertical-align: inherit; width: 100%; display: block; max-width: 100% !important;" src="https://bcn.135editor.com/files/images/editor_styles/bfa992962ff0f1e090ec959ab3290dfa.png" data-width="100%" draggable="false" data-ratio="0.024955436720142603" data-w="561"></section></section></section></section><section><section style="width: 100%; max-width: 100% !important;" data-width="100%"><img style="vertical-align: inherit; width: 100%; display: block; max-width: 100% !important;" src="https://bcn.135editor.com/files/images/editor_styles/956813c69a524c6ecdea262148955815.png" data-width="100%" draggable="false" data-ratio="0.5581395348837209" data-w="559"></section></section></section><section style="display: flex;justify-content: flex-end;align-items: flex-start;margin-top: -35px;"><section style="width: 30px;"><img style="vertical-align: inherit; width: 100%; display: block; max-width: 100% !important;" src="https://bcn.135editor.com/files/images/editor_styles/f76ccfbb235d422d0d33b573e7dbd115.gif" data-width="100%" draggable="false" data-ratio="1.4615384615384615" data-w="52"></section></section></section></section></section><section data-role="paragraph" class="_135editor"><p style="vertical-align:inherit;"><br></p></section></section>