Glass Plate Chamfered Edge Micro-Scratch Control

The patent applies preliminary action by forming a chamfered surface with controlled valley depth (Rv ≤ 2 μm) and projecting valley depth (Rvk ≤ 0.95 μm) before the glass plate is subjected to use. This preliminary surface treatment prevents micro-scratches from developing into critical defects that would trigger breakage under tensile stress, thereby resolving the contradiction between achieving high flexural strength through chemical strengthening and maintaining breakage resistance.

The patent converts the harmful effect of grinding by introducing a controlled chamfered surface with specific valley depth parameters. Instead of attempting to eliminate all surface irregularities from grinding, the invention controls the valley depth (Rv ≤ 2 μm) and projecting valley depth (Rvk ≤ 0.95 μm) to prevent micro-scratches from becoming critical defects, thereby maintaining flexural strength while achieving acceptable surface finish.

The patent applies parameter changes by precisely controlling the valley depth (Rv ≤ 2 μm) and projecting valley depth (Rvk ≤ 0.95 μm) of the chamfered surface. These parameter constraints optimize the balance between removing micro-scratches and minimizing stress concentration, ensuring that the valley parts are deep enough to prevent scratch propagation but shallow enough to avoid becoming stress concentration points under load.