De-drossing pocket

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The de-drossing pocket at the end of the tin bath prevents dross from sticking to the underside of the glass ribbon while it is being lifted out of the tin bath toward the dross box. It is mounted laterally to remove the dross that accumulates in the outlet area.
The contaminated tin is passed through a refractory channel. The dross floating on the tin gets stuck on a weir, is dammed up and can be removed. The system is usually driven by a linear motor that generates electromagnetic fields and thus a flow in the direction of the de-drossing pocket. Alternatively, a paddle system can be used, which reduces the cooling effect in the process – important in the production of special glass where cooling inputs must be avoided.
Just like the venting system, the de-drossing pocket is not absolutely necessary for the tin bath, but it contributes immensely to the quality of the glass. Together with the dross box, it helps guarantee the best possible quality.