Screen frame

A method of improving the stiffness of a screen support frame, said support frame comprising a perimeter disposed in a horizontal plane, defining a vertical direction normal to said plane, a first array of substantially parallel structural wires extending between opposing regions of the perimeter in a first horizontal plane, a second array of substantially parallel structural wires extending between opposing regions of the perimeter in a second horizontal plane, said first and second arrays of structural wires being aligned at an angle to each other and in contact with each other thus forming a plurality of contact points between structural wires of the first and second array respectively, the improvement in stiffness being provided by providing at least one additional structural wire, said additional structural wire extending between opposing regions of the perimeter and being positioned parallel to, and substantially vertically spaced from, a wire in the first array of structural wires, and in contact with wires of the second array, thereby providing an arrangement of two parallel wires on either side and in contact with the wires in the second array, said arrangement providing an increased stiffness to the screen support frame.