Annealing Lehr

Controlled cooling glass. The annealing lehr removes stresses in the glass by carefully cooling down the ribbon from 600°C to room temperature.

Considerable stresses are developed in the glass ribbon as it cools.

Too much stress and the glass will break inside the lehr or will not cut into the sheets.

Careful control of the ribbon cooling inside the lehr allows the glass to be cut at the cold end. This ensures that the customer is presented with a final sheet of glass that conforms to very high standards of edge quality, flatness and low residual stress.

Scanning technology is used to automatically detect stress levels in the glass and control the temperatures within the lehr over its 134m length.