July 2017, the Belgian company CNUD-EFCO International N.V., the world’s number one in annealing lehr and tin bath solutions, part of the BMT Group, is announcing its participation in German Glass Float Technology company GFT GmbH. CNUD-EFCO has signed a financial participation agreement with the owners of GFT GFT is a highly reliable partner recognized for implementing improvements in float
Why do we sometimes use forced convection for the cooling of soda lime glass and in other cases not? Some operators and managers would answer that it has always been like that. Nonetheless physics can explain why and how the industrial evolution brought us to this practice. Large cellular glass ribbons (up to 4m) are annealed by radiation cooling. Cellular
Thermal insulation works with the principle of keeping still air (gas) without allowing any convection. The molecules only move and collide randomly without any organized behavior (convection). Glass as base material has a lot of advantages compared to polymer. Glass is not combustible; diffusion of gases in the glass is negligible at room temperature; the glass does not creep or
Standard text books learn that radiation is the main heat transport system at higher temperatures. For that reason, most people don’t realize that radiation can be important at lower temperatures. The most popular example at room temperature is the low-E double glazing. Indeed, installing a low-E coating on the warm pane of the double glazing halves the thermal conductivity of
In case of production lines of 250 TPD and more, heating is not needed for standard thicknesses. From the dross box until 450°C, we have to work with controlled cooling without forced convection in order to achieve the requested residual stress for a proper glass cutting and processing afterwards. The glass is able to radiate to heat exchangers under and
The CNUD flat / float glass lehr has a long history which is absolutely worth to be studied because it explains at the same time the current lay out of a lehr. In the past, it was general practice for flat (rolled) glass to work with a ceramic tunnel (and radiation cooling) down to 300°C. Below 300°C, forced convection (F-zone) was
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