#AskGlaston Episode 40: What can I do to reduce chipping at the edge of the glass?

This week, we are dealing with the following question:

What can I do to reduce chipping at the edge of the glass – it happens in the furnace.

For this week’s question, see our full video response below!

What can I do to reduce chipping at the edge of the glass – it happens in the furnace.

In our experience, the most typical reason for edge chipping in the tempering process is that glass is bending during the heating process, so that the edges are bending down. Then those edges are hitting the rollers while oscillating. Impact on the roller causes the chipping at the edge. To reduce or avoid the chipping, try to keep the glass flat during the heating. This can be done by balancing the heat transfer between top and bottom with top/bottom convection or heating.

As always, remember to learn, share and succeed!

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About the author

Antti Aronen

An experienced researcher and engineer in the field of theoretical and experimental research, Antti is Glaston’s Senior Research Engineer in D&I. He is passionate about sharing his deep knowledge of glass products and processes with others. His PhD thesis was on glass heat treatment, and he continues to enthusiastically model the tempering process today. An innovator at heart, he has even registered some patents over the years. To counterbalance living at the top of the world in Finland, he spent nearly 4 years “down under” as a Research Fellow at the University of Sydney in Australia.

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