To prevent the tin melt from oxidising, the atmosphere in the tin bath should be natural-reduced (without oxygen) by using a shield gas based on nitrogen and hydrogen.

HORN^® offers a complete system for the supply and control of shield gas. The shield gas mixing station is integrated in a 40' sea container, which is divided into two gas-tight separated areas. The process chamber contains one redundant shield gas mixing station and two nitrogen pressure control stations. For individual adjustment of H₂ demand at each bay of the tin bath the tin bath shield gas control stations will be installed, which leads to further dilution of N₂H₂ gas with N₂.  

BENEFITS

• Redundant-safe supply of shield gas
• Cost-effective dosing of the relatively expensive H₂ gas
• Optimisation of dew point along the tin bath
• Individual adjustment of N₂ and N₂H₂ ratio for each tin bath bay