Manufacture of viscose products

Claim 1

A PROCESS FOR THE CONTINUOUS MANUFACTURE OF VISCOSE THREADS WHICH COMPRISES EXTRUDING A MULTIPLICITY OF THREADS THROUGH SPINNERETS INTO A COAGULATING BATH CONTAINING SULPHURIC ACID AND SALTS THEREOF, PASSING THE THREADS IN A PARALLEL RELATIONSHIP LINEARLY THROUGH A SECOND BATH OF SUCH LENGTH THAT THE SPEED AT WHICH THE THREAD PASSES THROUGH THE BATH LIMITS THE TIME OF PASSAGE TO LESS THAN ONE SECOND, THEREBY LOWERING THE XANTHATE RATIO TO ABOUT 0.108 WHICH IS INSUFFICIENT TO PERMIT SUBSEQUENT COMPLETE DESULPHURIAZATION, SAID SECOND BATH BEING MAINTAINED AT A TEMPERATURE IN THE RANGE OF 60* C.-95* C. AND CONTAINING A LOWER CONCENTRATION OF ACID AND SALT THAN THAT OF THE FIRST BATH, WASHING THE THREADS FREE OF SALTS, TREATING THE THREADS FOR LESS THAN ONE SECOND WITH A DILUTE SULPHURIC ACID SOLUTION MAINTAINED BETWEEN ROOM TEMPERATURE AND 60* C., DECOMPOSING THE REMAINING XANTHATE IN THE THREADS TO A XANTHATE RATIO BELOW 0.003 BY EXPOSING THEM TO THE ACTION OF STEAM, AND FINALLY REMOVING ALL OF THE SULPHURIC EXCEPT ABOUT 0.04% BY WASHING THE THREADS IN WATER BELOW ABOVE 40* C.