Process for producing flat glass

摘要

The present invention relates to improvement in a method of supplying a glass ribbon in a molten state to be supplied from a glass melting furnace to a flat glass forming apparatus, which can further improve the smoothness of a flat glass after formed. A glass ribbon 13 supplied from a glass melting furnace 14 to a flat glass forming apparatus 15 is stretched between one pair of tension rollers 24 A and 24 B in an S-shape and the tension rollers 24 A and 24 B are rotated while applying a surface pressure to the glass ribbon 13 face via a thin layer of a steam film generated by vaporization of a steam film forming agent. By means of rotation of the tension rollers 24 A and 24 B, the face of the glass ribbon 13 still in a molten state is polished via the steam film 18.