Importance

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Abstract

A method of bending glass sheets, the method including the steps of gravity bending a glass sheet at elevated temperature on a gravity bending mould in a gravity bending zone of a furnace, press bending the gravity bent glass sheet to a desired shape with an upper mould while the glass sheet is supported by the gravity bending mould as a lower mould in a press bending zone of the furnace and controlling the ambient temperature in the press bending zone thereby to control the cooling rate of the glass sheet in the press bending zone. The invention also provides a method of press bending glass sheets, the method including providing an initially bent glass sheet carried on an articulated gravity bending mould and press bending the glass sheet to a final bent shape by an upper press bending mould which is lowered onto the upper surface of the glass sheet, the upper press bending mould having a net weight of from 50 to 150 kg.

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First Claim