METHOD FOR MANUFACTURING BELT-SHAPED GLASS FILM

摘要

After a glass film ribbon (3) is formed while allowing a glass to descend, the glass film ribbon (3) is annealed while allowing the glass film ribbon (3) to descend in an annealer (5) to remove an internal strain. Then, when the glass film ribbon (3) having a thickness at a center portion excluding both widthwise ends of 300 µm or less is cut, after processing in the annealer (5) is executed and before a cutting step is executed, main tensile rollers (6R) that play a role as principal tensile rollers hold the descending glass film ribbon (3) and are driven to rotate, to thereby provide at least the glass film ribbon (3) in the annealer (5) with tension in a vertical direction.