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    • 95. 发明授权
    • Process for the manufacture of fibrils
    • 原纤维制造工艺
    • US4125584A
    • 1978-11-14
    • US812031
    • 1977-07-01
    • Robert E. BoehmeClarence R. Murphy
    • Robert E. BoehmeClarence R. Murphy
    • D01F6/04D01D5/18D01D5/40C08G51/12B24D3/00
    • D01D5/40Y10S264/47
    • Centrifugal spinning apparatus is provided for the manufacture of fibrils from hot viscous hydrocarbon solutions of olefin polymers having an intrinsic viscosity of at least 3.5. The apparatus consists of an impeller which rotates at high speed in a cylindrical cavity having a discharge port. The impeller has a plurality of blades whose narrow dimensions lie substantially in the plane of the impeller's rotation and whose tips come in close proximity to the inner peripheral surface of the cylindrical cavity. The blades are arranged in at least two substantially-identical sets. Within each set, the blades are offset substantially equidistant from one another, both in the rotational plane of the impeller and in the plane transverse thereto. Two inlet ports are provided in the peripheral surface of the cylindrical cavity to feed liquids to the cylindrical cavity, each of which port is narrow in a plane transverse to the plane of the impeller's rotation and extends over substantially the entire peripheral surface. The inlet ports are positioned near the discharge port of the cylindrical cavity and upstream thereof viewed with respect to the impeller's rotation, so that the bulk of the liquids entering the cavity from the inlet ports are swept away from the discharge port by the impeller's rotation.
    • {PG,1离心纺丝设备用于从特性粘度至少为3.5的烯烃聚合物的热粘性烃溶液制造原纤维。 该装置由在具有排出口的圆柱形空腔中高速旋转的叶轮组成。 叶轮具有多个叶片,其狭窄尺寸基本上位于叶轮的平面(3s旋转中,并且其尖端靠近圆柱形腔的内周表面)。 叶片布置在至少两个基本相同的组中。 在每组中,叶片在叶轮的旋转平面中和横向于其的平面中彼此基本等距离地偏移。 两个入口端口设置在圆柱形空腔的圆周表面中,以将液体供给到圆柱形腔体,每个孔口在垂直于叶轮平面的平面(3s旋转中并且在基本上整个圆周表面上延伸)的窄边。 入口端口位于圆柱形腔的排出口附近,并且相对于叶轮(3s的旋转)观察其上游,使得从入口端口进入空腔的大部分液体从排出口被扫除 叶轮{3 s旋转。
    • 98. 发明授权
    • Fibril formation process
    • 纤维形成过程
    • US3997648A
    • 1976-12-14
    • US214925
    • 1972-01-03
    • Joseph Calvin DavisFrancis Ross GalianoRobert William Hill
    • Joseph Calvin DavisFrancis Ross GalianoRobert William Hill
    • D01F6/04C04B16/06D01D5/40D01F6/00D21H13/14B02C18/00
    • D01D5/40D21H13/14D21H5/202
    • 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.
    • 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。