A glass plate bend-breaking machine for a glass plate includes a supporting mechanism by which a glass plate with a predetermined bend-breaking line as a cut line formed on an upper surface, i.e., one surface, thereof is supported at a lower surface, i.e., another surface, of the glass plate; and press-breaking devices and for press-breaking the glass plate along the predetermined bend-breaking line. Each of the press-breaking devices has a pressing body for simultaneously pressing a plurality of parts and along the predetermined bend-breaking line on the upper surface of the glass plate at the time of press-breaking the glass plate along the predetermined bend-breaking line at each of press-breaking positions on the glass plate.

A device for press-cutting glass, a method for press-cutting glass, and a glass-cutting system having the device for press-cutting glass. The device for press-cutting glass comprises a supporting member, having a first supporting portion and a second supporting portion for supporting a glass substrate, which are arranged in a spaced apart manner in a first direction; and a press-cutting member for press-cutting an edge of the glass substrate, which is positioned between the first supporting portion and the second supporting portion in the first direction. The device for press-cutting glass has advantages including high press-cutting efficiency, simple structure, low manufacturing cost, and easy assembling with other devices.

Systems and methods are described for controlled crack propagation in a material using ultrasonic waves. A first stress in applied to the material such that the first stress is below a critical point of the material and is insufficient to initiate cracking of the material. A controlled ultrasound wave is then applied to the material causing the total stress applied at a crack tip in the material to exceed the critical point. In some implementations, the controlled cracking is used for wafering of a material.

Systems and methods are described for controlled crack propagation in a material using ultrasonic waves. A first stress in applied to the material such that the first stress is below a critical point of the material and is insufficient to initiate cracking of the material. A controlled ultrasound wave is then applied to the material causing the total stress applied at a crack tip in the material to exceed the critical point. In some implementations, the controlled cracking is used for wafering of a material.

After a glass sheet (G) having a scribe line (S) formed thereon is placed on a placement table (10) and positioned so that the scribe line (S) is positioned in a bending stress applying portion (15) of the placement table (10), when the glass sheet (G) is split along the scribe line (S) by applying a bending stress to a formation region of the scribe line (S) by the bending stress applying portion (15), the glass sheet (G) is positioned by laying a resin sheet (9) under the glass sheet (G) on the placement table (10) and aligning one side (G1) of the glass sheet (G) extending in a direction along the scribe line (S) with marks (Ma to Nd) projected onto a protruding portion (9a) of the resin sheet (9) by laser markers (16a to 16d).

After a glass sheet (G) having a scribe line (S) formed thereon is placed on a placement table (10) and positioned so that the scribe line (S) is positioned in a bending stress applying portion (15) of the placement table (10), when the glass sheet (G) is split along the scribe line (S) by applying a bending stress to a formation region of the scribe line (S) by the bending stress applying portion (15), the glass sheet (G) is positioned by laying a resin sheet (9) under the glass sheet (G) on the placement table (10) and aligning one side (G1) of the glass sheet (G) extending in a direction along the scribe line (S) with marks (Ma to Nd) projected onto a protruding portion (9a) of the resin sheet (9) by laser markers (16a to 16d).

Provided is a method of producing a glass roll including: a conveying step of conveying a glass film (G) along a longitudinal direction thereof; a cutting step of irradiating the glass film (G) with a laser beam (L) from a laser irradiation apparatus (19) while conveying the glass film (G) by the conveying step, to thereby separate the glass film (G) into a non-product portion (Gc) and a product portion (Gd); and a take-up step of taking up the product portion (Gd) into a roll shape, to thereby form a glass roll (R). The cutting step includes a step of winding a thread-like peeled material (Ge) generated from an end portion of the product portion (Gd) in a width direction around a rod-shaped collecting member (23), and leading the wound thread-like peeled material (Ge) in a predetermined conveying direction (PX) by a leading device (24).

Provided is a method of manufacturing a glass sheet, which comprises a conveying step of conveying a glass sheet (G3) by holding an upper part of the glass sheet (G3) in a vertical posture. The conveying step comprises a first conveying step of conveying the glass sheet (G3) in a first direction along a direction perpendicular to a main surface of the glass sheet (G3), and a second conveying step of conveying the glass sheet (G3) in a second direction along a direction parallel to the main surface after the first conveying step. When a conveying direction of the glass sheet is changed from the first direction to the second direction, a lower part of the main surface (G3y) is supported by a roller (41) of a support portion (4) from a forward side in the conveying direction of the glass sheet (G3) conveyed in the first direction.

A method of separating an edge portion from a glass substrate includes applying a scoring tool of a scoring apparatus to a glass substrate to cause the scoring tool to score the glass substrate along a score line as the glass substrate moves relative to the scoring apparatus and applying a breaker bar of a breaker apparatus to the glass substrate as the glass substrate moves relative to the breaker bar to separate an edge portion from the glass substrate along the score line.

A method of separating an edge portion from a glass substrate includes applying a scoring tool of a scoring apparatus to a glass substrate to cause the scoring tool to score the glass substrate along a score line as the glass substrate moves relative to the scoring apparatus and applying a breaker bar of a breaker apparatus to the glass substrate as the glass substrate moves relative to the breaker bar to separate an edge portion from the glass substrate along the score line.