The glass must be heated to approximately 620-630oC (1148-1166oF), above its transition temperature. This prepares it for tempering, but also allows glass to be safely bent in a mould if required. Temperature monitoring ensures successful heating for either of these applications.
In some tempering processes, the glass is held at an elevated temperature in a soak zone to help ensure it reaches a uniform temperature. This prepares it for tempering and allows it to be safely bent in a mould if required. Temperature monitoring will ensure uniform heating across the glass.
Ensuring temperature uniformity is essential to the quality of the tempering process, and also ensures the glass is heated to the correct level for bending. A linescanner is ideal for monitoring this uniformity, but can be affected by the emissivity of the glass, particularly if coatings are used.
Viewing the glass from above using a
linescanner, with a compact
non-contact thermometer viewing from underneath, allows any surface coating to be compensated for. This produces a more accurate temperature measurement, to more closely monitor product quality by ensuring the glass is sufficiently heated.
Recommended Products - LSP-HD 50FL, FLT5A, SOLOnet SN51 and IQ.