| abstract |
PROCEDURE FOR THE MANUFACTURE OF A MEMBRANE, ESPECIALLY FOR THE INTERIOR AND EXTERNAL LIMITS, WITH WHICH RESULTS VARIOUS EFFECTS ON THE POROSITIES OF THE INTERNAL AND EXTERNAL SURFACES. IT CONSISTS OF A SOLUTION FOR SPINNING BASED ON 8 UP TO 25 PER 100 BY WEIGHT OF CELLULOSIC ESTER, 55 TO 92 PER 100 OF SOLVENT, AND EVENTUALLY UP TO 20 PER 100 BY WEIGHT OF OTHER ADDITIVES, IS PRESSED THROUGH A ROW SUBMERGED IN A PRECIPITATION BATH, SUBJECTING TO THE SOLUTION JET TO THE COAGULATING EFFECT OF THE BATH IN THE LIMITS OF THE JET OVER A SECTION OF AT LEAST 30 CM. IT IS THEN REMOVED FROM THE BATHROOM AND WASHED WITH WATER, IMPREGNATED WITH PLASTICIZING SOLUTION AND DRIES AT A TEMPERATURE NOT EXCEEDING 70C. THE MEMBRANES CAN BE CONSTITUTED BY HOLLOW WIRE, HOSE SHEETS OR FLAT SHEETS, AND IN EACH CASE THE APPROPRIATE DEVICE IS ADOPTED FOR THEIR FORMATION. THUS, FOR EXAMPLE, IN THE CASE OF HOLLOW THREADS OR HOSE SHEETS, THEY ARE MANUFACTURING A PRECIPITATIONAL BATHROOM INTERIOR OF THE SPINNING SOLUTION JET, MAY HAVE DIFFERENT COMPOSITIONS OF BATHROOMS OF EXTREME PRODUCTION AND EXTREMELY EFFECTIVE INTERIOR PRODUCTION LIMITS. |