Dross box

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The dross box is the interface and sluice between the tin bath and the annealing lehr. Here, for the first time, the glass floating on the tin is lifted out by three motorized rollers and transferred to the annealing lehr. The dross box also has the important task of sealing the tin bath atmospherically. This is done by means of graphite pressing below the driven rollers and curtains above the glass.
The special features of the CNUD EFCO GFT dross box include adjustable pressure on the graphite blocks and an adjustable roller height. In addition, the dross box is not welded but attached by means of a clamping device, which is firmly secured after the tin bath has been heated to 620 °C. In this way, physically induced thermal expansion is taken into account without deforming the construction. Additional advantages include lower heat losses and a more homogeneous heat distribution within the dross box.