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1. 发明授权

US3997648A Fibril formation process 失效
标题翻译：纤维形成过程
公开(公告)号：US3997648A
公开(公告)日：1976-12-14
申请号：US214925
申请日：1972-01-03
申请人： Joseph Calvin Davis , Francis Ross Galiano , Robert William Hill
发明人： Joseph Calvin Davis , Francis Ross Galiano , Robert William Hill
IPC分类号： D01F6/04 , C04B16/06 , D01D5/40 , D01F6/00 , D21H13/14 , B02C18/00
CPC分类号： D01D5/40 , D21H13/14 , D21H5/202
摘要： An improvement in the fibril formation process which includes dissolving at an elevated temperature an olefin polymer having an inherent viscosity of at least 3.5 in a hot hydrocarbon solvent, shearing the hot polyolefin solution to thereby orient the polymer molecules therein, passing the sheared solution through a cooling zone maintained at a temperature well below the precipitation temperature of the solution while maintaining the orientation of the polymer molecules within the solution to thereby precipitate by thermal means the polymer solute of the solution in the form of a solvent swollen fibrous strand, separating a substantial portion of the polymer solvent from the fibrous strand, chopping and then beating the chopped fibrous strand in a liquid which is a nonsolvent for the polymer and which is soluble in the polymer solvent for a time sufficient to break down the fibrous strand into a plurality of fibrils, and separating the fibrils from the nonsolvent liquid. The improvement consists of homogenizing the hot polyolefin/hydrocarbon solvent solution by passing same through a device, such as a gear pump, which imposes a high shear on the solution to thereby remove any small, invisible globules of partially dissolved polyolefin that may be present in the solution prior to the fibril formation steps of the process whereby paper sheets fabricated from the resultant fibrils are free of small knots and lumps and possess a completely smooth surface.
摘要翻译：原纤维形成方法的改进，其包括在高温下将热固性烃溶剂中特性粘度至少为3.5的烯烃聚合物溶解，剪切热聚烯烃溶液，从而使聚合物分子在其中定向，使剪切溶液通过冷却区保持在远低于溶液的沉淀温度的温度，同时保持聚合物分子在溶液中的取向，从而通过热法沉淀出溶剂溶胀的纤维束形式的溶液的聚合物溶质，部分聚合物溶剂从纤维链中切割，然后将该切碎的纤维束以对于聚合物为非溶剂的液体进行打浆，该液体可溶于聚合物溶剂中足以将纤维束分解成多个原纤维，并将原纤维与非溶剂液体分离。该改进包括将热的聚烯烃/烃溶剂溶液通过使其通过诸如齿轮泵的装置来均匀化，该装置在溶液上施加高剪切，从而除去可能存在的部分溶解的聚烯烃中的任何小的不可见小球在该方法的原纤维形成步骤之前的溶液，由此由所得原纤维制成的纸张不具有小结和块状并且具有完全光滑的表面。

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