湿法纺丝是化学纤维的主要纺丝方法之一,简称湿纺。湿法纺丝包括以下步骤:(1)制备纺丝原液;(2)将原液从喷丝孔挤出形成细流;(3)原液流动并固化成初生纤维;(4)初生纤维被卷绕或直接后处理。
将成纤聚合物溶解在适当的溶剂中,得到一定组成、一定粘度、可纺性好的溶液,称为纺丝原液。也可以通过均相溶液聚合直接获得。聚合物溶解前溶胀,即溶剂先渗入聚合物,使大分子之间的距离不断增大,然后溶解形成均匀的溶液。整个过程耗时较长,溶胀过程的速度对溶出速率有重要影响。在纺丝之前,聚合物溶液必须经过混合、过滤和消泡程序,以使纺丝原液的性能均匀,去除其中夹带的凝胶块和杂质,并去除溶液中的气泡。在粘胶纤维的生产中,纺丝前的准备也包括熟化过程,使粘胶具有必要的可纺性。
湿法纺丝的特点是喷丝板孔多,但纺丝速度慢,适合纺短纤维,而干法纺丝适合纺长丝。一般同品种化学纤维干纺比湿纺结构更均匀,质量更好。
DW7091A小型湿法纺丝机适用于实验室生产各种化纤材料。是专为纺织领域新材料研究而设计的、高分子等材料。
仪器特性
- 该设备主要由原料罐、计量泵、过滤器、喷丝板组件、凝固浴、拉伸浴、卷绕机构组成;
- 料罐、计量泵、凝固浴、拉伸浴温度实时采集与控制;
- 不锈钢原料罐,使物料受热更均匀;
- 用千分表测量原料罐中的压力;
- 计量泵压力、流量实时显示;
- 调节手轮,调节喷丝组件的高度;
- 滚筒速度可调;
- 触摸屏控制显示界面。
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