Apparatus and method for producing plate glass

• Main Authors: HANAI KOICHI, BAN NOBUYUKI, IGA MOTOICHI, TAKIGUCHI TETSUSHI
• Format: Patent
• Language: Chinese; English
• Published: 04.05.2011
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

Provided are apparatus and a method for producing plate glass, wherein a sulfate protective layer for preventing defects can be formed efficiently on the glass ribbon. The protective layer forming part of the plate glass production apparatus is upstream of the slow-cooling furnace and the temperature of the glass ribbon is set in the 500 DEG C to 750 DEG C zone which is favorable for the reactionbetween sulfurous acid gas and alkaline earth metals. The protective layer forming part is maintained in an essentially sealed state, being separated off by an upstream barrier member which makes contact with the lower surface of the glass ribbon on the upstream side in the direction of travel of the glass ribbon and a downstream barrier member which may or may not be in contact with the lower surface of the glass ribbon on the downstream side in the direction of travel of the glass ribbon. The upstream barrier member is in contact with the glass ribbon and so there is no leakage of the oxidizing atmosphere in the pro