| 摘要 |
Solutions of high molecular weight polymers, such as ultrahigh molecular weight polyolefins are prepared, by forming a slurry of particles of the polymer in a solvent for the polymer, then transferring the slurry to a pumping device, then pumping the slurry under pressure to insure positive displacement to a screw extruder, and maintaining the slurry in the screw extruder for sufficient residence time at sufficient temperature so that a homogeneous solution is formed, then conveying the solution with the screw extruder to metering device which can feed a spinnerette, or a film-forming or tape-forming slit extruder. |
