Patent ID: 9643878
Date: 2017-05-09
CPC Classifications: C03B

Claim:
1. A manufacturing method for a glass sheet, comprising: fusing a glass sheet by irradiating the glass sheet with a laser along a preset cutting line, which is a boundary between a product portion to be used as a product and a non-product portion to be discarded, and jetting an assist gas onto molten glass generated by melting the glass sheet through heating with the laser so as to remove the molten glass by scattering the molten glass; and breaking the non-product portion so as to discard the non-product portion, wherein the glass sheet comprises a band-shaped glass ribbon, the preset cutting line extends in parallel to a longitudinal direction of the band-shaped glass ribbon, the assist gas is jetted from a product portion side with respect to the preset cutting line, to thereby cause scattered pieces of the molten glass to adhere to the non-product portion as pieces of dross, and one of a front surface and a back surface of the non-product portion having the pieces of dross adhering thereto after the fusing, and onto which the laser is caused to enter, is curved so as to exhibit a convex curved surface in the longitudinal direction, so that a tensile strength is applied to the convex curved surface of the non-product portion, to thereby break the non-product portion into pieces.