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Dross Box (with Lift-Out Roller)

Sealed transition chamber for transferring glass ribbon from the tin bath to the annealing lehr

Dross Box (with Lift-Out Roller)
  • Dross Box (with Lift-Out Roller)
  • Dross Box (with Lift-Out Roller)
  • Dross Box (with Lift-Out Roller)
  • Dross Box (with Lift-Out Roller)

    • In flat glass production, the dross box (with lift-out roller) is positioned between the tin bath and the annealing lehr. Its main function is to seal the end of the tin bath, preventing protective gases inside the bath from leaking out and blocking external air from entering. At the same time, it transfers the glass ribbon from the tin bath into the annealing lehr for the next stage of processing. This point in the production process poses particular challenges, because the glass ribbon, which is still very fragile, requires the utmost precision in handling under extreme ambient conditions.

    From a process perspective, the dross box links two key thermal systems, the tin bath and the annealing lehr. Operating at temperatures between 600 °C and 700 °C, it is the critical zone where glass transitions from a highly viscous plastic state to the initial elastic state. The stability and sealing performance of this chamber are essential to maintaining product quality and ensuring smooth process continuity.

    • Production capacity: 1200t/d (max. raw sheet width 5.8m, min. sheet thickness 0.12mm)
    • Glass pull rate: 30-1200t
    • Glass thickness: 0.12-19mm
    • Glass width: 4-5.8m
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    Advantages
    Easier and safer roller replacement
    Schematic diagram of roller replacement in box-type sealed dross box

    Easier and safer roller replacement

    Improved sealing performance, combining side insulation and bottom insulation methods
    Schematic diagram of lower box structure in box-type sealed dross box

    Improved sealing performance, combining side insulation and bottom insulation methods

    Controllable internal temperature, combining upper heating and bottom heating methods
    Schematic diagram of electric heating structure in box-type sealed dross box

    Controllable internal temperature, combining upper heating and bottom heating methods
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    To keep raw materials flowing evenly, the system uses two drive stations and three clutches that can be combined in different ways. This makes the feeding shovels move together in sync, so the material is delivered continuously without interruptions.

    The box is built with precise welding, so it doesn’t bend or lose shape, and then it’s heat-treated to make it even stronger. Inside, stronger stainless-steel plates are used, which can handle high temperatures without losing stability. This makes the box more reliable in daily use and lowers the risks that usually come with long-term operation.

    The lift-out roller table is built with a steel frame that has a circulating water system inside. This cooling setup prevents the frame from bending or losing shape when exposed to high heat. The bearings are also water-cooled, which reduces wear and extends their service life. Thanks to this design, the machine can keep running reliably even during long periods of continuous production at high temperatures.

    The stirring depth can be adjusted depending on production needs. As the blades move, they generate vortexes in the molten glass that collide and mix together. This motion helps mix the molten glass thoroughly, making sure it stays even in both composition and quality before it goes into the forming stage.