Method for production of glass components

Patent metadata

Field	Value
Publication number	US-9682883-B2
Application number	US-201514675301-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	Apr 30, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A method for the production of glass components, an apparatus for carrying out the method, and a glass component that is obtainable through the method are provided. The method is a drawing method wherein a forming zone of a preform is heated to a temperature that allows drawing of the glass. The method includes a forming zone of the preform that is very small. Thereby the width of the preform is decreased to a smaller extent than its thickness. The glass components that can be obtained by this method have very smooth surfaces.

First claim

The invention claimed is:

1. A method for redrawing of glass, comprising the steps of:
providing a blank of glass having an average thickness D and an average width B,
heating a deformation zone of the blank, and
drawing the blank to an average thickness d and an average width b,
wherein the deformation zone is a part of the blank that has a thickness of between 0.95*D and 1.05*d, and
wherein the deformation zone has a height of at most 15*D, and
wherein the ratio B/b is at most 2.

2. The method according to claim 1 , wherein the deformation zone has a height of at most 250 mm.

3. The method according to claim 2 , wherein the step of heating the deformation zone comprises heating to a temperature T 2 that is selected such that a viscosity η 2 of the glass is at most <10 7.6 dPas.

4. The method according to claim 1 , wherein the step of heating the deformation zone comprises heating to a temperature T 2 that is selected such that a viscosity η 2 of the glass is at most <10 7.6 dPas.

5. The method according to claim 1 , wherein the glass is a technical glass or an optical glass.

6. The method according to claim 1 , wherein the glass is heated in a redrawing apparatus which at least comprises a heating facility selected from the group consisting of a resistance heater, a burner arrangement, a radiation heater, a laser, and combinations thereof.

7. The method according to claim 1 , wherein the blank is drawn in a region below the deformation zone by a drawing facility.

8. The method according to claim 1 , wherein the blank is fed from a region above the deformation zone into a direction of the deformation zone.

9. The method according to claim 1 , wherein the drawing of the blank is sufficient so that a ratio of the average thickness (d) to the average width (b) is 1:2 to 1:250,000.

10. The method according to claim 1 , wherein the drawing of the blank is sufficient to provide the blank with a fire-polished surface having a roughness (Ra) of at most 20 nm.

11. The method according to claim 1 , wherein the deformation zone has a height of at most 100 mm.

12. The method according to claim 1 , wherein the ratio B/b is at most 1.6.

13. The method according to claim 1 , wherein the ratio B/b is at most 1.25.

14. The method according to claim 1 , wherein the thickness D is at least 0.05 mm.

15. The method according to claim 1 , wherein the thickness D is at least 1 mm.

16. The method according to claim 1 , wherein the thickness D is at most 40 mm.

17. The method according to claim 1 , wherein the thickness D is at most 30 mm.

18. The method according to claim 1 , wherein the ratio D/d is at most 10.

19. The method according to claim 1 , wherein the ratio D/d is at most 200.

Assignees

• Schott Ag

Inventors

• Buellesfeld Frank
• Lange Ulrich
• Biertuempfel Ralf
• Pudlo Lisa
• Jung Helge

Classifications

• C03B23/037 Primary

  by drawing · CPC title

• Y10T428/24355

  Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] · CPC title