| 摘要 |
A method for cutting a glazing unit without applying a breaking force. The method applies a treatment to the glass sheet that generates stresses with a biaxial distribution, the stresses being such that the K factor is between 0.05 and 0.4 MPa.m<SUP>1/2</SUP>; the K factor being defined by <?in-line-formulae description="In-line Formulae" end="lead"?>K=[∫sigma<SUB>z</SUB><SUP>2</SUP>.H(sigma<SUB>z</SUB>).dz]<SUP>1/2 </SUP><?in-line-formulae description="In-line Formulae" end="tail"?> in which z is a position in the thickness, sigma<SUB>z </SUB>is intensity of the approximately isotropic biaxial stress at the position z, H(sigma<SUB>z</SUB>) is equal to 1 if sigma<SUB>z </SUB>is greater than 0 and is equal to 0 if sigma<SUB>z </SUB>is less than or equal to 0, with the convention that extension is denoted by positive values and compression by negative values. A subcrack deeper than 10 mum is scored along the desired line of cutting, the subcrack reaching that region of the glazing in extension. The method allows cutting of glass, without breaking it, along curves with a small radius of curvature, or of glass strips of width similar to the thickness, or of frame shapes used as inserts in a flat field emission display. |
