Abstract: A tube assembly for use in a spout bowl assembly including a bowl for receiving molten glass having a central orifice closed by an orifice plate having one or more openings and a corresponding plurality of vertically reciprocating plungers associated with the orifice openings, the tube assembly comprising a tube mounted for rotation about a vertical axis. The tube includes a plurality of vent holes arranged horizontally around the tube, and a heat baffle including a cylindrical side wall and a bottom wall for closing the cylindrical side wall, an opening in the bottom wall for accommodating one or more reciprocating plungers. The bottom wall includes a downwardly projecting conical surface extending substantially around the bottom wall, and the heat baffle mounted so that the conical surface is horizontally adjacent the tube vent holes.

Abstract: A glass forehearth is disclosed which is made up of upstream and downstream zones each having a roof structure which divides the channel into opposed side channels separated by a central channel. The glass in the central channel is heated for at least a portion of its length enabling the flow rate of the forehearth to be decreased.