| 摘要 |
An improved process of manufacturing fibers by the technique of forming a mixture of polymer, solvent for such polymer and, optionally, water or other flashing aids, at a temperature (flash temperature) which is high enough to bring the polymer to a plastic state and which will permit substantially complete vaporization of the solvent when the mixture is flashed, flashing the mixture into a flash zone to produce a fibrous product and subsequently refining the fibrous product characterized in that the fibrous product is first cooled prior to passing it through a primary refining zone. The primary refining is effected under conditions that impart a vigorous fibrillating action to the fibrous product and provides a pulp having a drainage factor in excess of 1.0 seconds/gram.
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