Apparatus for spinning solutions of high polymers

Claim 1

A DEIVCE FOR SPINNING A SOLUTION OF HIGH POLYMERS, INCLUDING A SPINNERET PLATE OF RIGID METAL PROVIDED WITH EXTRUSION ORIFICES HAVING A CROSS-SECTIONAL AREA AT THE INLET EQUAL TO AT LEAST 50 TIMES THE CROSS-SECTIONAL AREA AT THE OUTLET, COMPRISING, IN COMBINATION, A SPINNERET PLATE FILTER PLACED ON SAID PLATE, SAID FILTER BEING IN CONTACT WITH SAID PLATE OVER ITS ENTIRE SURFACE AND COVERING ALL OF SAID ORIFICES, SAID SPINNERT PLATE FILTER COMPRISING AT LEAST ONE FABRIC FORMED OF FILAMENTS OF SYNTHETIC RESINOUS MATERIAL, SAID FILAMENTS HAVING A SUBSTANTIALLY CIRCULAR CROSSSECTION AND CYLINDRICAL SHAPE, SAID FABRIC CONTAINING AT LEAST 10,000 INTERSTICES PER SQUARE CENTIMETER BETWEEN THE THREAD CROSSING, THE AVERAGE AREA OF SAID INTERSTICES BEING SMALLER THAN THE CROSS-SECTIONAL AREA AT THE OUTLET END OF SAID EXTRUSION ORIFICES AND BEING EQUAL TO AT MOST 0.003 SQUARE MILLIMETER, AND, SPACED FROM THE SPINNERET PLATE FILTER AND SEPARATED THEREFROM BY A HOLLOW SPACE OF AT LEAST 1 MM. THICKNESS, A PRELIMINARY FILTER CONTAINING AT LEAST ONE FABRIC FORMED OF FILAMENTS OF SYNTHETIC RESINOUS MATERIAL, IN ORDER TO PERMIT THE SOLUTION ISSUING FROM ALL POINTS OF THE PRELIMINARY FILTER, TO REACH ANY OF THE EXTRUSION ORIFICES, SAIF FILAMENTS HAVING A SUBSTANTIALLY CIRCULAR CROSS-SECTION AND CYLINDRICAL SHAPE, SAID FARBIC CONTAINING AT LEAST 10,000 INTERSTICES PER SQUARE CENTIMETER BETWEEN THE THREAD CROSSING, THE AVERAGE AREA OF SAID INTERSTICES BEING SMALLER THAN THE CROSS-SECTIONAL AREA AT THE OUTLET END OF SAID EXTRUSION ORIFICES AND BEING EQUAL TO AT MOST 0.00O SQUARE MILLIMETER.