Method and apparatus for producing a thin glass ribbon, and thin glass ribbon produced according to such method

US11897806B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Andreas Habeck · Undenheim, DE
• Thomas Rossmeier · Bodenheim, DE
• Jürgen Vogt · Oberheimbach, DE
• Ulrich Lange · Mainz, DE
• Stephan Zachmann · Gau-Odernheim, DE
• Thomas Wiegel · Alfeld, DE

Key dates

• Filing date: Feb 18, 2020
• Grant date: Feb 13, 2024
• Expiry date: Sep 20, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C3/091
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An improved method and an improved apparatus are provided for producing a thin glass ribbon, which provide borders at the edges of the ribbon. The edges formed are of high mechanical quality and a formation of new secondary borders after the severing or at least the thickness of such secondary borders is reduced compared to the original borders. The method includes drawing the thin glass ribbon from a molten glass or from a preform, severing the borders, and cooling the resulting glass ribbon. The severing is effected at a location along the moving direction of the thin glass ribbon and at a time at which during the cooling of the thin glass ribbon the viscosity of the glass is in a range from 107 dPa·s to 1011 dPa·s, so that the edges of the thin glass ribbon newly produced by the severing of the borders are rounded off.