Abstract DRAWING 1. AN IMPROVED CONTINUOUS PROCESS FOR THE HOT DRAWING OF A CONTINUOUS LENGTH OF A POLYBENZIMIIDAZOLE FIBROUS MATERIAL CONTAINING UP TO ABOUT 100 PERCENT BY WEIGHT OF WATER, SAID DRAWING OCCURING WITHOUT FOAMING AND WITHOUT WEMPOLYING MULTIPLE PASSES OF THE FIBROUS MATERIAL THROUGH THE DRAWING ZONE OF DRAWING THE FIBROUS MATERIAL WHILE IN CONTACT WITH A HEATED SURFACE, WHICH PROCESS COMPRISES: (A) CONTINUOUSLY PASSING SAID CONTINUOUS LENGTH OF POLYBENZIMIDAZOLE FIBROUS MATERIAL IN THE DIRECTION OF ITS LENGTH, FOR A SINGLE PASS, THROUGH AN ELONGATED DRAWING ZONE CONTAINING A HEATED GASEOUS ATMOSPHERE MAINTAINED AT A TEMPERATURE OF ABOUT 400 TO 600*C., (B) CONTINUOUSLY PASSING A PREHEATED GAS INTO SAID DRAWING ZONE AT A RATE WHICH YIELDS A REYNOLD''S NUMBER WITHIN THE DRAWING ZONE OF ABOUT 50 TO 50,000 SO AS TO CONTACT SAID FIBROUS MATERIAL THEREIN, (C) DRAWING SAID FIBROUS MATERIAL IN SAID DRAWING ZONEWHILE IN CONTACT WITH SAID REPHEATED GAS AT A DRAWRATIO OF ABOUT 2:1 TO 5:1 AND AT A DRAWING SPEED OF AT LEAST 10 METERS PER MINUTE, AND (D) THEREAFTER CONTINUOUSLY WITHDRAWING FROM SAID DRAWING ZONE A STREAM OF GAS AND DRAWN POLYBENZIMIDAZOLE FIBROUS MATERIAL.
AN IMPROVED CONTINUOUS PROCESS FOR THE HOT DRAWING OF A CONTINUOUS LENGTH OF A POLYBENZIMIIDAZOLE FIBROUS MATERIAL CONTAINING UP TO ABOUT 100 PERCENT BY WEIGHT OF WATER, SAID DRAWING OCCURING WITHOUT FOAMING AND WITHOUT WEMPOLYING MULTIPLE PASSES OF THE FIBROUS MATERIAL THROUGH THE DRAWING ZONE OF DRAWING THE FIBROUS MATERIAL WHILE IN CONTACT WITH A HEATED SURFACE, WHICH PROCESS COMPRISES: (A) CONTINUOUSLY PASSING SAID CONTINUOUS LENGTH OF POLYBENZIMIDAZOLE FIBROUS MATERIAL IN THE DIRECTION OF ITS LENGTH, FOR A SINGLE PASS, THROUGH AN ELONGATED DRAWING ZONE CONTAINING A HEATED GASEOUS ATMOSPHERE MAINTAINED AT A TEMPERATURE OF ABOUT 400 TO 600*C., (B) CONTINUOUSLY PASSING A PREHEATED GAS INTO SAID DRAWING ZONE AT A RATE WHICH YIELDS A REYNOLD''S NUMBER WITHIN THE DRAWING ZONE OF ABOUT 50 TO 50,000 SO AS TO CONTACT SAID FIBROUS MATERIAL THEREIN, (C) DRAWING SAID FIBROUS MATERIAL IN SAID DRAWING ZONEWHILE IN CONTACT WITH SAID REPHEATED GAS AT A DRAWRATIO OF ABOUT 2:1 TO 5:1 AND AT A DRAWING SPEED OF AT LEAST 10 METERS PER MINUTE, AND (D) THEREAFTER CONTINUOUSLY WITHDRAWING FROM SAID DRAWING ZONE A STREAM OF GAS AND DRAWN POLYBENZIMIDAZOLE FIBROUS MATERIAL.
Claim 2
Dependent Claim
187 words
AN IMPROVED CONTINUOUS PROCESS FOR THE HOT DRAWING OF A CONTINUOUS LENGTH OF A POLYBENZIMIIDAZOLE FIBROUS MATERIAL CONTAINING UP TO ABOUT 100 PERCENT BY WEIGHT OF WATER, SAID DRAWING OCCURING WITHOUT FOAMING AND WITHOUT WEMPOLYING MULTIPLE PASSES OF THE FIBROUS MATERIAL THROUGH THE DRAWING ZONE OF DRAWING THE FIBROUS MATERIAL WHILE IN CONTACT WITH A HEATED SURFACE, WHICH PROCESS COMPRISES: (A) CONTINUOUSLY PASSING SAID CONTINUOUS LENGTH OF POLYBENZIMIDAZOLE FIBROUS MATERIAL IN THE DIRECTION OF ITS LENGTH, FOR A SINGLE PASS, THROUGH AN ELONGATED DRAWING ZONE CONTAINING A HEATED GASEOUS ATMOSPHERE MAINTAINED AT A TEMPERATURE OF ABOUT 400 TO 600*C., (B) CONTINUOUSLY PASSING A PREHEATED GAS INTO SAID DRAWING ZONE AT A RATE WHICH YIELDS A REYNOLD''S NUMBER WITHIN THE DRAWING ZONE OF ABOUT 50 TO 50,000 SO AS TO CONTACT SAID FIBROUS MATERIAL THEREIN, (C) DRAWING SAID FIBROUS MATERIAL IN SAID DRAWING ZONEWHILE IN CONTACT WITH SAID REPHEATED GAS AT A DRAWRATIO OF ABOUT 2:1 TO 5:1 AND AT A DRAWING SPEED OF AT LEAST 10 METERS PER MINUTE, AND (D) THEREAFTER CONTINUOUSLY WITHDRAWING FROM SAID DRAWING ZONE A STREAM OF GAS AND DRAWN POLYBENZIMIDAZOLE FIBROUS MATERIAL.