| 摘要 |
<p>A centrifugal spinning apparatus and process are provided for the manufacture of fibrils from a hot viscous hydrocarbon solution of olefin polymers having an intrinsic viscosity of at least 3.5. The apparatus consists of an impeller (blades 42,44,46,48) which rotates at high speed in a cylindrical cavity (30) having a discharge port (22). 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 therto. Two inlet ports (50,52) are provided in the, peripheral surface of the cylindrical cavity to feed liquids to the cylindrical cavity, each of which ports 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 is swept away from the discharge port by the impeller's rotation.</p> |
