Patent ID: 7938926

Claim:
A method of manufacturing a filtering screen comprising the steps of: (1) locating a frame of plastics coated metal or reinforced plastics material in a jig, (2) placing at least two wire cloths over the frame, (3) individually gripping the edges of the cloths by pneumatically operated clamps carried by the jig, (4) driving the clamps pneumatically outwardly of the frame to tension each cloth in orthogonal directions, (5) pressing the tensioned cloth against the frame, (6) heating the cloths in order to bond them to the frame, (7) allowing the heated material to cool, (8) releasing the clamps after completion of the bonding step, (9) removing the frame from the jig, and (10) trimming back the at least two wire cloths to the edges of the frame as necessary, and wherein the heating and pressure is provided by a heated platen and the at least two wire cloths are protected from direct contact with the heated platen by placing a layer of heat resistant non-stick fabric over the upper cloth prior to the bonding step, and removing the fabric on completion of the bonding step.