Verfahren zur Herstellung von glaskristallinem Tafelmaterial aus Glasband und Wanne zu dessen Duchfuehrung

1,244,969. Glass-ceramic sheet material. ORDENA TRUDOVOGO KRASNOGO ZNAMENI ZAVOD "AUTOSTEKLO" 30 Oct., 1968, No. 51383/68. Heading C1M. Glass-ceramic sheet material is produced from a glass band 21 travelling along the surface of molten metal 2 in a bath 1, the glass being heated during travel by heaters 4, 5 to crystallize the glass and the band is then discharged at an angle α of 0‹ 10' to 0‹ 20' relative to the horizontal. The bath is divided into zones A, B, C and D with appropriate temperatures for crystallizing the glass and cooling to solidify the glass before removal. The molten tin used in the bath may be circulated to give an even flowing surface by a pump 11 from draining chamber 9, and pipe-lines 10 to a front chamber 12 and thence by passage 23 over a sill 14 to the bath 1. Nitrogen is fed through openings 16 in bath 1 and openings 17, 18 in chambers 9, 12 respectively. Specification 1,163,873 is referred to.