Process for producing a curved laminated safety glass sheet

Abstract

This invention concerns a process for producing a curved, laminated safety glass sheet from a first curved glass sheet (,), a first laminated layer (,), a thermoplastic substrate sheet (,) with a biaxially drawn thin-layer system (,), a second laminated layer (,), and a second curved glass sheet (,) conforming to the first one. To avoid formation of folds in the substrate layer, the process has the following steps: (a) a prelaminated sheet consisting of the first laminated layer (,) and the substrate sheet (,) is superimposed with its laminated layer facing the first glass sheet, (b) a bend-resistant cover sheet (,) conforming to the first glass sheet (,) is superimposed on the prelaminated sheet, (c) the glass layer packet formed out of the first glass sheet (,) and the prelaminated sheet with the cover sheet (,) superimposed upon it is preliminarily bonded by removing the air and subjecting it to pressure and heat, (d) the cover sheet (,) is removed, (e) the second laminated layer (,) and the second glass sheet (,) are superimposed on the preliminarily bonded glass-film pocket, (f) the laminate so formed is preliminarily bonded by removing the air and subjecting it to pressure and heat, (g) the preliminarily bonded laminate is finally bonded into a laminated safety glass sheet by subjecting it to pressure and heat.