Air-cooled closed-end tube for isopipe end mass compensation and sheet thickness compensation

Abstract

A glass forming apparatus including a forming body having a trough for receiving a molten glass. The trough defined by an inlet end, a distal end, a first weir and a second weir opposite and spaced apart from the first weir, and a base extending between the first weir and the second weir along a length of the forming body. A thermal element positioned adjacent at least one of the first weir or the second weir and extending parallel to the forming body from the inlet end or the distal end toward the other of the inlet end or the distal end, wherein a length of the thermal element is less than about

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