METHOD AND DEVICE FOR MANUFACTURING GLASS PLATE

摘要

The purpose of the present invention is to provide a technique that enables a glass ribbon to be manufactured by a float method without generating localized deformations known as straw marks. The present invention comprises applying an outward tensile force to both end parts of a glass ribbon using a plurality of pairs of top rollers provided to both widthwise edge sides of the travel pathway from the upstream region to the downstream region of the travel pathway, and manufacturing a glass ribbon having a thickness equal to or less than 1 mm. The process uses top rollers provided with barrel heads for outwardly pulling the widthwise edges of the glass ribbon transported from the upstream region to the downstream region along the travel pathway. Among the barrel heads provided to the upstream, midstream, and downstream regions of the travel pathway and caused apply an outward tensile force to the widthwise edges of the glass ribbon, a multistage barrel head provided with three or more rows of outer peripheral blades is used as the barrel head provided to the midstream region, and standard barrel heads provided with one or two rows of outer peripheral blades are used as the barrel heads provided to the upstream and downstream regions.