METHOD AND APPARATUS FOR MANUFACTURING PLATE GLASS

To suppress the occurrence of chippings or cracks, etc. so that an appropriate bending stress acts in the periphery of a scribe line when folding and breaking plate glass having a vertical posture and having an unnecessary region including an ear part.SOLUTION: A method for manufacturing plate glass comprises: forming scribe lines S on the sides of the surfaces Ga and Gy having a boundary part between an effective region G1 and an unnecessary region G2 including an ear part Ge having a plate thickness thicker than the effective region G1 in a plate glass G having the effective region G1 and the unnecessary region G2 and formed in a width direction end; and folding and breaking the plate glass G along the scribe lines S while pulling the unnecessary region G2 in the vertical direction in the state of hanging and supporting the plate glass G in a vertical posture.SELECTED DRAWING: Figure 2 【課題】耳部を含む不要領域を有する縦姿勢の板ガラスを折り割る際に、スクライブ線の周辺に適正な曲げ応力が作用するようにして、チッピングや割れ等の発生を抑止する。【解決手段】有効領域Ｇ１と、有効領域Ｇ１よりも板厚が厚い耳部Ｇｅが幅方向端部に形成された不要領域Ｇ２とを有する板ガラスＧに対して、有効領域Ｇ１と不要領域Ｇ２との境界部の表面Ｇａ、Ｇｙ側にスクライブ線Ｓを形成し、板ガラスＧを縦姿勢に吊り下げ支持した状態で、不要領域Ｇ２を上下方向に引っ張りながら当該板ガラスＧをスクライブ線Ｓに沿って折り割る。【選択図】図２