Thin glass substrate, method and apparatus for its production

US11890844B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Armin Vogl · Jena, DE
• Thomas Schmiady · Jena, DE
• Thilo Zachau · Bürstadt, DE
• Jochen Alkemper · Klein-Winternheim, DE
• Michael Meister · Mainz, DE
• Christian Kunert · Wiesbaden, DE
• Lutz Klippe · Wiesbaden, DE
• Rüdiger Dietrich · Jena, DE

Key dates

• Filing date: Jun 24, 2019
• Grant date: Feb 6, 2024
• Expiry date: Jun 24, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24777
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A thin glass substrate, as well as a method and an apparatus are provided. The glass substrate has a glass having first and second main surfaces and elongated elevations on one of the main surfaces. The elevations rise in a normal direction, have a longitudinal extent that is greater than two times a transverse extent, and have a height, on average, that is less than 100 nm, and with a transverse extent of the elevation smaller than 40 mm. The method includes melting a glass, hot forming the glass, and adjusting a viscosity of the glass so that for the viscosity η1 for a first stretch over a first distance of up to 1.5 m downstream of a flow rate control component and y1 indicating a second distance to a location immediately downstream the flow rate control component the equation lg η1(y1)/dPa·s=(lg η01/dPa·s+a1(y1)) applies.