Glass tube element with improved quality

Patent metadata

Field	Value
Publication number	US-11613489-B2
Application number	US-202117221566-A
Country	US
Kind code	B2
Filing date	Apr 2, 2021
Priority date	Apr 3, 2020
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

A glass tube element is provided that includes hollow cylindrical section that has a shell enclosing a lumen and a path extending on a surface of the shell facing away from the lumen. The path extends across a first area of the shell where the stress values are within a first interval. The path also extends across a second area of the shell where the stress values are within a second interval.

First claim

What is claimed is:

1. A glass tube element, comprising:
hollow cylindrical section that has a shell enclosing a lumen; and
a path extending on a surface of the shell facing away from the lumen, wherein the path extends across a first area of the shell where stress values are within a first interval, and wherein the path extends across a second area of the shell where stress values are within a second interval.

2. The glass tube element of claim 1 , wherein the path follows at least one intersection line formed by intersecting a plane comprising an entire center axis of the glass tube element and the surface of the shell facing away from the lumen.

3. The glass tube element of claim 2 , wherein the path follows the at least one of the intersection lines across an entire length of the glass tube element.

4. The glass tube element of claim 1 , wherein the path follows at least one intersection line formed by intersecting a plane perpendicular to a center axis of the glass tube element and the surface of the shell facing away from the lumen.

5. The glass tube element of claim 4 , wherein the path follows the at least one of the intersection lines across the entire outer circumference of the glass tube element.

6. The glass tube element of claim 1 , the second area follows successively after the first area along the path.

7. The glass tube element of claim 1 , wherein the path extends across a first plurality of first areas and a second plurality of second areas.

8. The glass tube element of claim 7 , wherein the first and second areas occur repeatedly alternately along the path.

9. The glass tube element of claim 7 , wherein the first and second areas occur in direct succession along the path.

10. The glass tube element of claim 1 , wherein the path extends across a third area of the shell where stress values are within a third interval, wherein, along the path, the third area has a position selected from a group consisting of: follows successively after the first area, arranged directly between the first area and a next first area, and arranged directly between the first area and the second area.

11. The glass tube element of claim 1 , wherein the path extends across a number of successive sub-areas of the second area where stress values of each sub-area are within a respective sub-interval comprised by the second interval.

12. The glass tube element of claim 1 , wherein the first and second areas are arranged along the path such that the second area is diametrically opposed to the first area.

13. The glass tube element of claim 1 , wherein the stress values of the first interval are different to and/or non-overlapping with the stress values of the second interval.

14. The glass tube element of claim 1 , wherein the stress values of the first interval correspond to compressive stress and an upper border of the second interval has an absolute value larger than a greatest absolute value of the first interval.

15. The glass tube element of claim 1 , wherein the stress values of the first interval comprise a value range between −0.5 MPa and −10 MPa.

16. The glass tube element of claim 1 , wherein the stress values of the first interval comprise a value range between −4 MPa and −6 MPa.

17. The glass tube element of claim 1 , wherein the stress values of the second interval correspond to an offset relative to the first interval of up to −5 MPa.

18. The glass tube element of claim 1 , wherein the stress values of the second interval correspond to an offset relative to the first interval of between −1 MPa and −2.5 MPa.

19. The glass tube element of claim 1 , wherein the first and second areas each comprise (i) at least one surface area of the surface of the shell facing away from the lumen and/or (ii) at least one volume area of the shell, wherein the shell preferably has a thickness measured from the surface of the shell facing away from the lumen in perpendicular direction towards the lumen.

20. The glass tube element of claim 1 , wherein the first area comprises first groups connected with each other by a connected first super-area of the shell,
wherein the second area comprises second groups connected with each other by a connected second super-area of the shell,
wherein the first and second super-areas are connected with each other by a connected super-sub-area of the shell.

21. The glass tube element of claim 20 , wherein the stress values in the first super-area lie within the first interval, and wherein the stress values in the second super-area lie within the second interval.

22. The glass tube element of claim 21 , wherein on the unrolled cylinder shell the first super-area and/or the second super-area each is designed at least in part in form of at least one stripe or in form of a plurality of parallel and/or non-parallel stripes.

Assignees

• Schott Ag

Inventors

• Trinks Volker
• Witzmann André

Classifications

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03B17/04 Primary

  Forming tubes or rods by drawing from stationary or rotating tools or from forming nozzles · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• C03B35/26

  Transporting of glass tubes or rods · CPC title