SCREEN PRINTING FRAME HAVING PRESTRESSING REINFORCEMENT

摘要

A screen support frame includes elongated frame members (12, 14, 16, 18) and at least one elongated secondary member (66) extending along at least a portion of one of the frame members. The secondary member includes a surface contacting a surface of the frame member and affixed thereto along at least a portion of the secondary member. The affixation of the secondary member occurs while differential strains are imposed on the frame member and the secondary member at the respective contact surfaces to apply a prestress or camber to the frame member. The secondary member may be welded to the frame member. According to another aspect of the invention, a tensioning frame includes rotatably supported rollers (22, 24 , 26, 28) for tensioning the screen secured together by connectors (38, 40). The rollers include hollow cylinders defining an interior in which at least one elongated reinforcing member extends to prestress or camber the roller.