Method of making ravel proof edge and apparatus

Claim 1

AN EXTRUSION DIE FOR APPLYING A MARGINAL PLASTIC STRIP TO THE PERIPHERAL EDGE OF CUT FABRIC WHICH HAS A COMPLEX SHAPE COMPRISING A PRESSURE CHAMBER FOR THE PLASTIC, SAID CHAMBER HAVING A TRANSVERSE SLOT FORMED THEREIN CONSTRUCTED TO ACCOMMODATE THE EDGE OF SAID FABRIC WHEN SAID FABRIC MOVES LONGITUDINALLY OF SAID CHAMBER, SAID SLOT BEING OPEN AT ONE END AND CLOSED AT ITS OTHER END, FEED MEANS ADJACENT THE SIDES AND CLOSED END OF SAID SLOT FOR FEEDING PLASTIC TO THE EDGE OF SAID FABRIC AS SAID EDGE IS MOVED LONGITUDINALLY OF SAID CHAMBER, PRESSURE MEANS CONNECTED TO SAID CHAMBER FOR FORCING SAID PLASTIC THROUGH SAID FEED MEANS, SAID FEED MEANS INCLUDING SPACED-APART UPPER PLATE MEMBERS WHICH ARE INCLINED DOWNWARDLY TOWARD THE FABRIC AND ALSO INCLUDES SPACEDAPART LOWER PLATE MEMBERS WHICH ARE INCLINED UPWARDLY TOWARD THE FABRIC, THE LOWERMOST OF SAID UPPER PLATE MEMBERS BEING SPACED ABOVE THE UPPERMOSE OF SAID LOWER PLATE MEMBERS AT A DISTANCE-LESS THAN THE THICKNESS OF SAID FABRIC.