Curved glass sheet manufacture incorporates an air blowing operation between initial and final bending to provide an asymmetry, notably for motor vehicle windows

摘要

Fabrication of curved glass sheets involves displacing glass sheets that have been previously heated to their softening temperature and progressively conferring the desired curvature. Between the initial and final phases of bending, at a location in the line of displacement, air is continuously blown on at least one surface of the glass sheet under conditions capable of influencing in an asymmetrical fashion the final concavity of the glass sheet with respect to that which would be imparted to the final bending without the blowing of air. Independent claims are also included for: (a) curved glass sheets obtained by this method and presenting an asymmetry able to be detected by polaroscopy or using a stratorefractometer or a biasograph; (b) a machine for the bending of glass sheets by this method.