Seel, Matthias ; Müller-Braun, Steffen ; Hof, Peter ; Schneider, Frank ; Schneider, Jens ; Oechsner, Matthias (2023)
Edge strength of annealed float glass: Identification and optimisation of cutting process parameters.
Glass Performance Days (GPD 2023). Tampere, Finland (14.06.2023-16.06.2023)
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Kurzbeschreibung (Abstract)

The desire to apply annealed float glass with its economic and optical advantages in comparison to tempered glass is limited in part by the reduced edge strength. In the design standard for glass DIN 18008 the edge strength amounts only 80 % of the surface strength. Due to temperature stresses, the edge strength of annealed float glass is a decisive factor, especially in the design of insulating glazing. This stress reduction is mainly a result of the applied cutting process with the corresponding parameters and the glass handling. The type of cutting process and the related cutting parameters (pressure, cutting wheels, etc.) have a significant influence on the development of micro cracks and finally on the edge strength. A defined cutting process allows reproducible and enhanced edge strength. This paper presents results of destructive tests regarding the edge strength. For the investigations, glass panes were cut on an industrial cutting machine with various process settings. Among others, the following cutting parameters were varied: type of cutting wheel, cutting pressure, cutting speed and cutting fluid. In addition to the process parameters, different glass types, glass thicknesses and both surfaces (tin and atmosphere) were investigated. The tests were examined with the aim to determine the correlations between cutting process / glass parameters, edge strength and micro crack geometry as well as to optimise the parameters. The destructive tests were carried out with a modified four point bending test, but also with the standard four point bending test according to EN 1288-3.

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