Backup wire for fourdrinier machine

Claim 1

FOR USE IN A PAPERMAKING MACHINE AND THE LIKE HAVING AN ENDLESS FORMING SCREEN TRAVELING THROUGH AN ENDLESS PATH TO RECEIVE AN AQUEOUS SUSPENSION OF FIBERS FROM WHICH WATER DRAINS THROUGH SAID SCREEN TO LEAVE A LAYER OF FIBERS ON THE OUTER SURFACE OF SAID SCREEN, AND HAVING ONE OR MORE DEWATERING DEVICES POSITIONED ALONG A PORTION OF SAID ENDLESS PATH TO PROMOTE THE FLOW OF WATER THROUGH SAID SCREEN, AN ENDLESS SUPPLEMENTAL BELT MADE OF SCREEN-LIKE FABRIC SUBSTANTIALLY THE ENTIRE AREA OF WHICH IS WOVEN EXCLUSIVELY FROM SYNTHETIC FIBER-FORMING MATERIAL CHARACTERIZED BY HAVING WHETHER WET OR DRY GREAT TENSILE STRENGTH GREAT RESISTANCE TO ABRASION AND GREAT RESISTANCE TO DAMAGE DUE TO FLEXING, SAID BELT BEING ARRANGED ON SAID PAPERMAKING MACHINE TO MOVE IN AN ENDLESS PATH INSIDE THE ENDLESS PATH OF SAID FORMING SCREEN, THE ENDLESS PATHS OF SAID FORMING SCREEN AND SAID BELT SUBSTANTIALLY COINCIDING IN A PORTION OF THE ENDLESS PATH OF SAID FORMING SCREEN IN WHICH SAID FORMING SCREEN IS ADVANCED OVER AT LEAST ONE OF SAID DEWATERING DEVICES WHEREBY IN SAID PORTION OF SAID PATH SAID BELT IS INTERPOSED BETWEEN SAID FORMING SCREEN AND SAID DEWATERING DEVICES WITH THE OUTER SURFACE OF SAID BELT IN FACE-TO-FACE CONTACT WITH THE INNER SURFACE OF SAID FORMING SCREEN AND THE INNER SURFACE OF SAID BELT IN CONTACT WITH SAID DEWATERING DEVICES, THE FABRIC FROM WHICH SAID BELT IS FORMED HAVING THE WEFT YARNS EXTENDING LONGITUDINALLY AND THE WARP YARNS EXTENDING TRANSVERSELY OF THE PATH OF MOVEMENT OF SAID BELT, AND THE FABRIC OF SAID BELT BEING STABILIZED WITH THE TRANSVERSELY EXTENDING WARP YARNS SET IN UNDULATING FORM TO PROVIDE KNUCKLES EXTENDING ABOVE AND BELOW THE LONGITUDINALLY EXTENDING WEFT YARNS TO PROTECT SAID WEFT YARNS FROM ABRASIVE WEAR AND TO MESH WITH THE INNER SURFACE OF SAID FORMING SCREEN TO PROVIDE IMPROVED LONGITUDINAL DRIVING ENGAGEMENT BETWEEN THOSE PORTIONS OF SAID BELT AND SAID FORMING SCREEN WHICH ARE IN FACE-TO-FACE CONTACT.