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Down-Draw Process

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Down-Draw Process of SCHOTT Advanced Optics
The down-draw process developed exclusively by SCHOTT is used in Grünenplan to produce thin glasses and ultra clear flat glasses. During this process, a ribbon of glass is pulled down from the top, moving across various drums and through the cooling track.

Advanced Optics uses this process to produce SCHOTT AS 87 eco, the D 263® series, and AF 32® eco glasses, among others.

Main characteristics of the down-draw process
  • A flawless surface with a surface roughness of < 0.5nm
  • Broad thickness spectrum from 1.1 to 30 µm
  • Fast conversion to various glass types
  • Very high TTV (total thickness variation) and curvature specifications
  • High flexibility in regards to output and thickness.