An apparatus is provided for producing thin glass ribbons from molten glass. The apparatus includes a drawing tank, a direct heater, and an indirect heater. The drawing tank has a lower elongated nozzle opening through which the molten glass can exit downwards. The direct heater has one or more heating circuits operable to heat the drawing tank in a first heating zone. The direct heater has a power source for each on the heating circuits. Each heating circuit has connections to connected to a wall of the drawing tank so that current from the power source flows through at least a portion of the wall and heats the wall. Each heating circuit also includes current-carrying portions of the wall. The indirect heater has one or more heating elements to heat the drawing tank in a second heating zone.

Apparatuses and methods for heating moving continuous glass ribbons at desired lines of separation and/or for separating glass sheets from continuous glass ribbons are disclosed. An apparatus includes a translatable support portion and a heating apparatus coupled to the support portion. The heating apparatus is configured to contact the continuous glass ribbon across at least a portion of a width of the continuous glass ribbon at the desired line of separation as the support portion moves in a draw direction, thereby preferentially applying heat to a first side of the continuous glass ribbon at the desired line of separation as the continuous glass ribbon moves in the draw direction.

A base material for a disk roll, the base material including: 5 to 9 wt % of ceramic fibers, 20 to 40 wt % of kibushi clay, 2 to 20 wt % of bentonite and 40 to 60 wt % of mica.

A forming apparatus including a forming member extending in a longitudinal direction with a first forming surface and a second forming surface converging downwardly along a draw line of the forming member, a first weir structure including a central wall extending upwardly from and longitudinally with the forming member, the central wall including a central channel opening vertically upward orthogonal to the longitudinal direction and extending between first and second sidewall portions of the central wall, and a second weir structure comprising first and second sidewalls extending upwardly from the forming member, the first and second sidewalls spaced apart from one another in a lateral direction orthogonal to the longitudinal and vertical directions, the central wall disposed between the first and second sidewalls to define a first channel between the first sidewall and the central wall and a second channel between the second sidewall and the central wall.