<br><div><section class="_135editor" data-role="paragraph" style="font-size: medium; max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><section style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-size: 14px; 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;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">　　答 涤纶是一种热塑性纤维，在染色等一系列加工过程中，由于受多次机械作用和多次拉伸，使织物原来的门幅和线圈几何形状有所变化，因而产生变形和收缩，甚至横直丝缕歪斜，严重影响产品的质量。热定形目的主要是使涤纶针织物在有张力状态下加热，织物在规定温度下焙烘，使纤维分子问的次价键和分子链段的热运动加剧，从而可使分子重新组合、排列，内应力相对稳定。因此可提高织物的尺寸稳定性，增强抗皱性能，同时对织物表面光洁度、强力、抗起毛起球等性能也有一定的改善。涤纶针织物在热定形过程中关键是控制定形温度和定形时间，如果热定形温度过低，时问过短均能造成织物表面不平整、不挺括、门幅收缩等疵病，失去定形作用；如定形温度过高或时间过长，会造成织物发硬变脆，强力下降，弹性降低并能使某些分散染料升华而产生色差，严重的甚至能使纤维熔融。</span></p></section><section style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-size: 14px; 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;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">　　实践证明，涤纶针织物的合适定形温度为l80～210℃，定形时间20～90s，冷却温度为50℃左右。并可按下式计算(按不同定形机构造计算)：</span></p></section><section style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-size: 14px; 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;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">　　</span><img src="http://dayaotex-img.gz.bcebos.com/article/fffspic/yrjcdez001.dib" _src="http://dayaotex-img.gz.bcebos.com/article/fffspic/yrjcdez001.dib" data-ratio="0.16619718309859155" data-w="355" style="max-inline-size: 100%; margin: 0px; padding: 0px; max-width: 100%; overflow-wrap: break-word !important; outline: none 0px !important; height: auto !important;"></p></section><section style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-size: 14px; 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;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">　　各类涤纶针织物在Z921型针板拉幅定形机上，当定形温度为l85～190℃时，其线速度为：涤纶经编蚊帐布10～15m／min，涤纶经编衬衫布l2～18m／min，涤纶经、纬编外衣布l2～20m／min，涤纶色织提花布7～lOm／min。</span></p></section><section style="max-inline-size: 100%; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); font-size: 14px; 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;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">　　另外，定形时也不可忽视织物的“张力”和“超喂”应相互配合恰当。如果拉幅的幅宽超过织物所具有的门幅，将造成缩水率增大，强力下降等现象；如果超喂过大或张力大小不等则容易造成纬向波浪形(俗称“木耳边”)，反之则会在经向产生条纹。总之，在操作过程中要严格控制幅宽、张力、超喂等工艺条件。</span></p></section><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></section><section class="_135editor" data-role="paragraph" id="autoparagraph" style="font-size: medium; 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; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; font-family: 微软雅黑, &quot;Microsoft YaHei&quot;, sans-serif; font-size: 17px; caret-color: rgb(255, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"></p></section></div>