Taneli Ylinen
This week, we are dealing with the following question:
How to solve an issue with the heating spot appeared in Low-E glass, especially with the loading length above 4 m?
For this week’s question, see our full video response below!
Thank you for your question. With this information only, it is hard to say exactly what would be the problem. The first idea would be to check how the glass behaves in the furnace.
This hot spot usually appears when the glass is bending during the heating so that the edges are lifting up and then the middle part of the glass gets more heat from the rollers than the rest of the glass. At the end, when glass overall temperature gets high enough, glass will flatten out, so you will not see the big overall bending in the final product.
So, the first thing to do is to open the furnace door in the beginning of the heating process and see if any bending takes place. If the glass bends, increase the top convection level. And if that does not help enough, decrease the oven temperature and increase the heating time to slow down the heating process.
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