<p><br></p><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;"><p style="max-inline-size: 100%; clear: both; min-height: 1em; cursor: text; font-size: 14px; 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;">&nbsp; &nbsp; (二)棉纤维含水的基本概念<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;">&nbsp;&nbsp;&nbsp; 1.含水率与回潮率<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;">&nbsp;&nbsp;&nbsp; 含水率是指在规定条件下测得的棉纤维水分的重量对棉纤维湿重的比值,以试验试样的湿重与干重的差值对湿重的百分率表示。回潮率是指在规定条件下测得的棉纤维水分的重量对棉纤维干重的百分率,以试验试样的湿重与干重的差值对干重的百分率表示。</span></p><p style="max-inline-size: 100%; clear: both; min-height: 1em; cursor: text; font-size: 14px; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><img src="http://dayaotex-img.gz.bcebos.com/article/fffspic/gongsi006.png" _src="http://dayaotex-img.gz.bcebos.com/article/fffspic/gongsi006.png" draggable="false" data-ratio="0.5020979020979021" data-w="715" style="max-inline-size: 100%; margin: 0px; padding: 0px; max-width: 100%; cursor: pointer; width: 464px; overflow-wrap: break-word !important; outline: none 0px !important; height: auto !important;"></p><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; clear: both; min-height: 1em; cursor: text; font-size: 14px; 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;">&nbsp;&nbsp;&nbsp;&nbsp;<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;">&nbsp;&nbsp;&nbsp; 2.标准状态下的回潮率与公定回潮率<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;">&nbsp;&nbsp;&nbsp; 棉纤维的实际回潮率随环境温湿度的变化而变化。据有关资料介绍:空气温度为20℃时,若空气相对湿度是65%,棉纤维的回潮率为7%～8%;若空气相对湿度是95%,棉纤维的回潮率为12%～14%;若空气相对湿度是100%,棉纤维的回潮率为23%～27%。为了比较棉纤维与其他纺织纤维的吸湿能力,将它们放在同一标准大气条件下,一定时间后,它们的回潮率达到一个稳定的值,这时的回潮率叫标准状态下的回潮率。国际上,对标准状态的规定是一致的,而允许的误差,各国略有出入。我国棉纤维试验所规定的标准温湿度及允许误差为:温度20℃±2℃,相对湿度65%±3%。<br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;">&nbsp;&nbsp;&nbsp; 在贸易和成本计算中,棉纤维并不处于标准状态。即使在标准状态下,它的实际回潮率也与纤维本身的质量和含杂等因素有关。为了计重和核算价格的需要,必须对棉纤维的回潮率规定相应的标准,称为公定回潮率。公定回潮率的值纯属是为了工作方便并根据纤维材料吸湿能力的大小选定的,各国往往根据自己的实际情况确定棉纤维的公定回潮率。目前国际标准规定的棉纤维公定回潮率为8.5%,我国规定的棉纤维公定回潮率也为8.5%。</span></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></section><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;"><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" 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>