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Major glass manufacturer cuts distortion with tempering/toughening solution from LAND

Major glass manufacturer cuts distortion with tempering/toughening solution from LAND
05/07/2012

Before the use of low emissivity glass it was relatively easy to measure the temperature of the glass as it exited the Glass Tempering oven by using a 5µm waveband thermal linescanner.

Low emissivity glass, sometimes referred to as soft coated Low E glass is coated on one side. It is processed through a tempering/toughening oven with the soft coated side up to prevent damage to the coated side from the support rolls underneath. This makes measuring the glass surface temperature with a top mounted linescanner almost impossible. There are many grades of low emissivity coated glass and their emissivity values are very low and each grade has a different emissivity value.

There simply isn't enough room under the glass to mount a scanner to view the uncoated underside. A solution had to be found.

Solution

Using a LAND LSP-HD 50 infrared linescanner scanning from above is supplemented by a secondary sensor under the line. This sensor is usually a LAND Solonet 5 (SN5) with laser alignment. The Solonet is positioned to measure a narrow stripe along the underside of the glass. The location of this stripe is matched to a compensation zone for the LSP-HD 50 scanner above. The LSP-HD 50 temperature profile is amplified to match the underside temperature from the SN5. The remaining profile is amplified by the same percentage to achieve a fully corrected thermal image of the low emissivity coated glass.

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