# US 12,005,687 B2 · Thin glass substrate, method and apparatus for its production

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- Number: US 12,005,687 B2
- Document ID: US12005687B2
- Status: Granted
- Kind: B2
- Application number: 18/171,925
- Filed: 2023-02-21
- Published: 2023-06-22
- Granted: 2024-06-11
- Earliest claimed: 2016-12-22
- Assignees: Schott AG
- Applicants: Schott AG
- Inventors: Armin Vogl; Thomas Schmiady; Thilo Zachau; Jochen Alkemper; Michael Meister; Christian Kunert; Lutz Klippe; Rüdiger Dietrich
- Web page: https://patentgrep.com/patent/US12005687B2

## CPC

- B32B 3/263: {characterised by a layer having non-uniform thickness}
- B32B 3/02: characterised by features of form at particular places, e.g. in edge regions {(non-uniform thickness B32B3/263)}
- B32B 3/26: characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids {(foam layer B32B5/18; layer of synthetic resin characterised by fillers that create voids or cavities B32B27/205); characterised by an apertured layer}
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10045: {with at least one intermediate layer consisting of a glass sheet}
- B32B 17/10119: {having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate}
- B32B 17/10137: {Chemical strengthening}
- C03B 17/064: {by the overflow downdraw fusion process; Isopipes therefor}
- C03B 18/02: Forming sheets
- C03B 23/023: by bending
- C03C 3/083: containing aluminium oxide or an iron compound
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/093: containing zinc or zirconium
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- B32B 2315/08: Glass
- B32B 2329/04: Polyvinylalcohol
- B32B 2329/06: PVB, i.e. polyinylbutyral
- B32B 2551/00: Optical elements
- B32B 2571/00: Protective equipment
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- Y10T 428/24777: Edge feature
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 1

A glass substrate, comprising:
a glass having first and second main surfaces; and
elongated elevations on one of the first and second main surfaces, the elongated elevations substantially rising in a normal direction, having a longitudinal extent that is greater than two times a transverse extent, and having a height, on average, that is less than 100 nm, and with a transverse extent of the elevation smaller than 40 mm.

### Claim 2 (depends on 1)

The glass substrate of claim 1, further comprising a substantially wedge-shaped thickness variation with a value of less than 100 μm over a length of 1 m perpendicular to a drawing direction.

### Claim 3 (depends on 1)

The glass substrate of claim 1, further comprising a warpage with a value of less than 600 μm over a length of 1 m perpendicular to a drawing direction.

### Claim 4 (depends on 1)

The glass substrate of claim 1, further comprising a mean thickness from 0.5 mm to 2.6 mm averaged over a surface area of the first and second main surfaces of at least 10 cm*10 cm.

### Claim 5 (depends on 1)

The glass substrate of claim 1, wherein the glass is selected from a group consisting of an Li-Al-Si glass, an Al-Si glass, a borosilicate glass, and a K-Na-Si glass.

### Claim 6 (depends on 1)

The glass substrate of claim 1, wherein the glass is a lithium-aluminum silicate glass having an Li2O content from 4.6 wt % to 5.4 wt %, an Na2O content from 8.1 wt % to 9.7 wt %, and an Al2O3 content from 16 wt % to 20 wt %.

### Claim 7 (depends on 1)

The glass substrate of claim 1, wherein the glass substrate has a thickness of up to 10 mm.

### Claim 8 (depends on 1)

The glass substrate of claim 1, wherein the glass substrate has a thickness of up to 12 mm.

### Claim 9

A laminated glass pane comprising a first glass sheet laminated to a glass substrate having first and second main surfaces, and elongated elevations on one of the first and second main surfaces, the elongated elevations substantially rising in a normal direction, having a longitudinal extent that is greater than two times a transverse extent, and having a height, on average, that is less than 100 nm, and with a transverse extent of the elevation smaller than 40 mm.

### Claim 10 (depends on 9)

The laminated glass pane of claim 9, wherein the first glass sheet is a lithium-aluminum silicate glass sheet having an Li2O content from 4.6 wt % to 5.4 wt %, an Na2O content from 8.1 wt % to 9.7 wt %, and an Al2O3 content from 16 wt % to 20 wt %.

### Claim 11 (depends on 9)

The laminated glass pane of claim 9, wherein the laminated glass pane is configured for a use selected from a group consisting of a motor vehicle glazing, a windscreen projection device, and a head-up display.