| 摘要 |
<p>A forehearth for the conveyance of molten glass has at least one cooling zone which includes a trough (2) and a roof (17) over the trough. A pair of spaced projections (28, 30) extend downwardly from the roof to define in the space below the roof a central channel (36) over the central portion of the stream of molten glass and side channels (38, 40) over respective side portions of the stream of glass. The roof has at least one area (44) of reduced thickness in the portion over the central channel. An enclosed upper cooling channel (54) extends longitudinally of the forehearth over the area of reduced thickness and has an inlet (56) and an outlet (58) spaced longitudinally from the inlet. Heating means (20) are provided for applying heat to each side portion of the stream of glass.</p> |
