Always guided by a visionary and unconventional spirit, challenging the status-quo of the industry, PAPSAFETY's vision is to establish its leading presence on an international scale, providing exclusive design and personalized services.
Laminated Glass is a composition of two or more single panes of glass bonded with high strength, adhesive, flexible polyvinyl butyl (PVB) films. The glass panes used generally retain their technical characteristics. (ELOT EN 12543).
The characterization of this glass pane as a safety glass pane lies in the fact that in case of breakage of one or more panes of the composition, the fragments that will be created remain attached to the intermediate membranes, so that the multi-layer safety glass pane maintains its structural integrity, thus greatly reducing the risk of injury due to the detachment of the fragments.
The safety of the multi-layer glazing is due to the extremely high tensile strength of the PVB layer and its excellent adhesion to the adjacent surface of the glazing.
Depending on the use of the multi-layer safety glass, multiple membranes can be placed between the glass panes in order to meet any increased requirements.
All different types of glazing (basic flat, coated, printed, etc.) can be manufactured as multi-layer safety glazing.
The multi-layer safety glass is produced according to the requirements of the harmonised European Standard EN 14449. The layering of the glass is carried out using two or more flat glass panes with one or more intermediate membranes in an air purity controlled laboratory according to the above standard.
First, the film, which is opaque at this stage, is applied to a clean sheet of glass, the next sheet of glass is deposited and then the excess film is cut off at the edges. The glass pane is then prestrengthened by a rolling process at a temperature of approximately 200 C. It is then transferred to the furnace (a high-pressure combination machine) where the glass pane with the intermediate films is subjected to a pressure of approximately 10 bar and heated to approximately 130 C, producing as a final product a completely transparent multi-layer safety glass pane.
When the cycle is complete, the glass is removed and allowed to cool. The glazing is ready and the edges are then finished with minor work on the edges for the final finish. According to EN ISO 12543-6:2011 section 9, in the case of multi-layered glass panes with exposed edges, these must be grinded (Rode) or polished.The layering of the glass panes, depending on the membranes used, serves different purposes, such as safety, sound reduction, durability, UV protection and/or aesthetics. For example, coloured films can be applied or materials can be incorporated.
Better sound reduction can be achieved by adding sound reducing membranes.
As an indication, a 44.1 multi-layered glass pane with a single PVB film achieves a weighted sound reduction coefficient Rw≈34dB, while if the film is sound reducing it achieves Rw≈37dB.
Always guided by a visionary and unconventional spirit, challenging the status-quo of the industry, PAPSAFETY's vision is to establish its leading presence on an international scale, providing exclusive design and personalized services.
