Safety windowpanes made of laminated glass; processes for their manufacture

摘要

A safety windowpane and process of manufacture made of laminated glass. The windowpane includes two glasses made of annealed, hardened or quenched glass 1, 2 bonded to one another by an insert sheet of synthetic material 3 to the opposite faces of which the glasses are adhesively attached. The sheet includes in the material a line 4 of discontinuity in mechanical strength of relatively small width. The line defines an outline of preopening of a surface area such that after breaking of the glasses 1, 2 and rupture along the outline, it offers a sufficient passage for a human body.