In the case of laminated safety glass (LSG), if the pane breaks, the fragments adhere to an elastic, tear-resistant high-polymer film. At least two flat glass panes are bonded together via this film. The film is usually made of polyvinyl butyral (PVB) or Sentryglas plus (SGP).
The laminated safety glass unit retains a residual load-bearing capacity in the event of destruction. The risk of cuts and punctures caused by glass fragments is reduced.
At the beginning of production, the glass panes are cut to size and the edges are processed.
Image: Laminated safety glass - baukobox
Laminated safety glass is produced in an autoclave process. At an air temperature of approx. 140°C, the layers of flat glass and foil are pressed into laminated safety glass under a pressure of approx. 12 to 14 bar. In the process, which takes about one to six hours, a stress-free end product is produced. Before that, a pre-composite must be made from the layers.
Method for pre-laminated production in laminated safety glass:
Rolling / roller press:
In a short heating tunnel, the loosely placed panes are heated to approx. 35°C with foil with the help of medium-wave infrared rays. The air trapped in between is pushed out by a pair of rubber rollers.
The product then reaches another heating tunnel by heating the surface of the glass to 60 to 70°C. Then the rolling process is repeated. The glass is bonded to the film and can be fed into the autoclave process.
Vacuum process:
This process is mainly used for curved glass and for multiple composites. The air in the layers is evacuated at a vacuum of approx. -0.8 to -0.9 bar. Then the package is heated at about 100 to 120°C in a heating tunnel or cabinet for about 20 minutes. This creates a much clearer pre-bond than would be possible with the rolling process.
Germany, LSG must be part of the pane structure for overhead glazing. This ensures the residual load capacity in the event of a broken window. In the case of vertical glazing, a sufficient residual load-bearing capacity can also be achieved with laminated safety glass made of ESG.
Today, laminated glass with a cast resin composite is sometimes classified as laminated safety glass.
baukobox.de
