Patent ID: 7638011

Claim:
A process for the production of a curved laminated glass pane comprising a first glass glazing and a second corresponding glass glazing, together with an interlayer comprising at least one bioriented thermoplastic functional layer and at least one layer of a bonding resin, such process comprising the steps of: thermoforming on a mould said at least one bioriented thermoplastic functional layer, together with at least one layer of a bonding resin adhered to said at least one bioriented thermoplastic functional layer, in a configuration substantially corresponding to the end shape of said curved laminated glass pane; positioning said interlayer between the two glass glazings and applying pressure and heat to form a laminated glazing showing an end shape with one or more curvatures; and wherein, before the thermoforming step, said at least one bioriented thermoplastic functional layer and at least one layer of a bonding resin are heated and, during such heating, a hot air jet is injected from the bottom so as to effect a pretensioning of said at least one functional layer and then, after the thermoforming step and before said positioning said interlayer between the two glass glazings, said at least one functional layer and said at least one layer of a bonding resin are cooled by forced draught, whereby the shape of said at least one functional film is frozen.