| 摘要 |
<p><PICT:1019980/C1/1> <PICT:1019980/C1/2> In a method of glass manufacture in which a forward flow of molten glass takes place over a return flow of cooled molten glass one of the said flows is agitated to homogenize it whilst the two glass flows are segregated in the region of agitation to minimize interchange of molten glass between the two layers. In providing a flow of molten glass from a furnace into a drawing kiln the forward flow of glass 6 is homogenized by a stirrer 10. A streamlined vane 11 placed at the neutral plane below the stirrer 10 segregates the forward flow from the return flow 7. Alternatively the stirring action may be localized by providing the vane 11 with a vertical wall 15 at its downstream edge and placing a barrier wall 17 across the glass upstream of the stirrers, the bottom of said wall 17 being vertically spaced above the vane 11 to provide an inlet for the forward flow of glass. Preferably the glass flows along a channel provided with a bank of stirrers across its width, the vane 11 being mounted between the side walls of the channel in the neutral plane beneath the stirrers. The vane 11 and wall 17 are constructed in the manner disclosed in Specification 1,019,979. The agitation may be caused by bubbles in the top surface of the vane, or a heated grid placed in the forward flow above the vane.</p> |
