| 摘要 |
1420753 Heaters for float glass PILKINGTON BROS Ltd 11 April 1973 [21 April 1972] 18719/72 Heading ClM [Also in Divisions H3-H5] An electrical heater in an apparatus for manufacturing flat glass 28 on a molten metal bath 27 includes carbon heating resistors 8 enclosed in an elongated carbon box 1 to 6 from which they are insulated by supports with electrical connectors extending into the box from a terminal tab 26. The heaters are used in the float glass manufacturing process to heat directly the molten tin bath beside the glass sheet as in Fig. 4 and 10 and Figs. 3, 9,) not shown) or may be suspended in the roof of the reaction vessel (Figs. 11-14, not shown). In the embodiment described with respect to Fig. 10, heaters 39 maintain the temperature of the tin bath uniform whilst ,the surface of the glass is being modified by molten copper lead alloy 64 clinging to copper anode 60. Lead and copper ions migrate into the glass to be reduced later by hydrogen in the atmosphere above the glass giving a bronze appearance and heat rejecting properties. |
