Method and apparatus for making non-woven twill webs

Claim 1

IN THE METHOD OF CONTINUOUSLY PRODUCING A NONWOVEN WEB HAVING PARALLEL SIDE EDGES AND A NETWORK OF WEB-FORMING YARN PORTIONS DIAGONALLY ARRANGED WITH RESPECT TO THE SIDE EDGES AND OVERLAPPING AND INTERSECTING IN THE PLANE DEFINED BY THE SIDE EDGES, AND IN WHICH YARNS, INCLUDING A PAIR OF STRAIGHT SIDE YARNS EXTENDING PARALLEL TO THE SIDE EDGES OF THE PLANE DEFINING THE SIDE EDGES, ARE PROGRESSIVELY DRAWN FROM SUPPLIES THEREOF LONGITUDINALLY AND IN SUBSTANTIALLY PARALLEL RELATION TO THE SIDE EDGES OF THE PLANE, A PLURALITY OF WEB-FORMING YARN SUPPLIES ARE CONTINUOUSLY CIRCULATED IN A CLOSED PATH CIRCUMSCRIBING THE PLANE DEFINED BY THE SIDE YARNS AND TRANSVERSELY OF THE SIDE YARNS, THE WEB-FORMING YARNS ARE CONTINUOUSLY DRAWN FROM THE SUPPLIES THEREOF AND PROGRESSIVELY DRAWN LONGITUDINALLY WITH THE SIDE YARNS, WHILE BEING LAYED DIAGONALLY OF THE SIDE YARNS ON OPPOSITE SURFACES OF THE PLANE EXTENDING BETWEEN THE SIDE YARNS, AND DIAGONALLY EXTENDING, AND WEB-FORMING YARNS ON OPPOSITE SURFACES OF THE PLANE ARE SUBJECTED TO BONDING PRESSURE AT INTERSECTIONS THEREOF OF SAID WEB-FORMING YARNS TO FORM THE FLATTENED HELICES: THE IMPROVEMENT IN WHICH THE WEB-FORMING YARN SUPPLIES ARE CONTINUOUSLY CIRCULATED IN A CLOSED PATH INCLUDING A PAIR OF RECTILINEAR PORTIONS PARALLEL TO AND IMMEDIATELY ADJACENT OPPOSITE SURFACES OF SAID PLANE AND INCLUDING SEMICIRCULAR SHORT RADIUS PORTIONS EXTENDING ABOUT SAID PARALLEL SIDE EDGES, AND INTERCONNECTING SAID RECTILINEAR PORTIONS.