| 摘要 |
PURPOSE:To continuously mold the titled glass cylinder from a small-sectioned molten glass flow by uniformly controlling the temp. of a casting machine for forming the bottom surface and lower side surface of glass in desired shapes by contact with a backward flow toward the contact direction with the backward flow. CONSTITUTION:A temp. regulating unit consisting of an air-cooled cooler 1 and a thermocouple 2 and two sets of temp. regulating units consisting of coolers 3 and 3', heaters 4 and 5, thermocouples 6 and 7 are provided toward the contact direction with the backward flow B' which has been made highly viscous. Besides, a couple of temp. regulating units consisting of air-cooled coolers 8 and 9, heaters 10 and 11, and thermocouples 12 and 13 are furnished on both side surface parts. The temp. is controlled to a temp. close to the transition point of the glass by each temp. regulating unit. Under such conditions, the small-sectioned molten glass 15 flowing down from an outlet pipe 14 is poured into the mold while heating the glass by a heating element 16 and drawn out at a specified velocity from the other end of the mold to form the oversize glass cylinder 17. At this time, since the high-viscosity backward flow B' successively enlarging to a large section along the inner surface of the weir part of the mold can be regularly formed, the oversize glass cylinder 17 can be continuously obtained with high form precision.
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