Glass tube

Patent metadata

Field	Value
Publication number	US-12240777-B2
Application number	US-202117358467-A
Country	US
Kind code	B2
Filing date	Jun 25, 2021
Priority date	Jun 26, 2020
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

At least one glass tube has an azimuthal wall thickness deviation WTD of not more than 6.0%, the azimuthal wall thickness deviation being determined based on a lowest wall thickness value and a highest wall thickness value measured within a cross-section of the at least one glass tube, the azimuthal wall thickness deviation WTD being calculated according to the following formula:

W
⁢

⁢
T
⁢

⁢
D

=

100
-

(

lowest
⁢

⁢
wall
⁢

⁢
thickness
⁢

⁢
value

highest
⁢

⁢
wall
⁢

⁢
thickness
⁢

⁢
value

*
100

)

⁢

⁢

%
.

First claim

What is claimed is:

1. At least one glass tube having an azimuthal wall thickness deviation WTD of not more than 6.0%, the azimuthal wall thickness deviation being determined based on a lowest wall thickness value and a highest wall thickness value measured within a cross-section of the at least one glass tube, the azimuthal wall thickness deviation WTD being calculated according to the following formula:

W
⁢

⁢
T
⁢

⁢
D

=

100
-

(

lowest
⁢

⁢
wall
⁢

⁢
thickness
⁢

⁢
value

highest
⁢

⁢
wall
⁢

⁢
thickness
⁢

⁢
value

*
100

)

⁢

⁢

%
.

2. The at least one glass tube of claim 1 , wherein the azimuthal wall thickness deviation WTD is at most 5.0%.

3. The at least one glass tube of claim 1 , wherein the azimuthal wall thickness deviation WTD is at most 4.0%.

4. The at least one glass tube of claim 1 , wherein the azimuthal wall thickness deviation WTD is at most 3.0%.

5. The at least one glass tube of claim 1 , wherein the azimuthal wall thickness deviation WTD is at most 1.5%.

6. The at least one glass tube of claim 1 , wherein the at least one glass tube does not exceed the azimuthal wall thickness deviation WTD of at most 6.0% at two or more cross-sections, wherein at least two of the cross-sections are spaced apart from each other by at least 0.5 m.

7. The at least one glass tube of claim 6 , wherein at least two of the cross-sections are spaced apart from each other by at most 1.4 m.

8. The at least one glass tube of claim 1 , wherein the at least one glass tube does not exceed the azimuthal wall thickness deviation WTD of at most 6.0% at a first cross-section and a second cross-section, wherein the first cross-section is positioned in a first section of the at least one glass tube and the second cross-section is positioned in a second section or a third section of the at least one glass tube.

9. The at least one glass tube of claim 1 , wherein the azimuthal wall thickness deviation WTD does not exceed 6.0% at any cross-section over a whole length of the at least one glass tube.

10. The at least one glass tube of claim 1 , wherein the at least one glass tube has at least one of the following:
a length of at least one of at least 0.50 m, at least 1.00 m, or 1.5 m;
an outer diameter between 6.0 mm and 55.0 mm; or
a wall thickness between 0.3 mm and 3.5 mm.

11. The at least one glass tube of claim 1 , wherein a glass of the at least one glass tube has the following Vogel-Fulcher-Tammann (VFT) constants:
A ranging from −5.0 to 0.0;
B ranging from 4000 to 12000; and
T 0 ranging from 1° C. to 250° C.

12. The at least one glass tube of claim 1 , wherein the at least one glass tube comprises a glass comprising the following components in weight percent (wt.-%):

SiO 2
 50-90

B 2 O 3
  0-20

Al 2 O 3
>0-18

Na 2 O
 0-15

K 2 O
0-5

Li 2 O
0-2

CaO
 0-15

BaO
0-6

ZrO 2
0-5

TiO 2
0-5

Fe 2 O 3
0-3

13. The at least one glass tube of claim 1 , wherein the at least one glass tube has an average azimuthal wall thickness deviation WTD of at most 6.0%.

14. The at least one glass tube of claim 1 , wherein the at least one glass tube has an average azimuthal wall thickness deviation WTD of at least 0.1%.

15. The at least one glass tube of claim 1 , wherein the at least one glass tube has a maximum azimuthal wall thickness deviation WTD of at least 0.5%.

16. The at least one glass tube of claim 1 , wherein the at least one glass tube comprises a plurality of glass tubes to form a set of glass tubes, at least 90% of the glass tubes having an azimuthal wall thickness deviation WTD of not more than 8.0%, the azimuthal wall thickness deviation WTD for each glass tube being determined based on a lowest wall thickness value and a highest wall thickness value measured within a cross-section of the glass tube, the azimuthal wall thickness deviation WTD being calculated according to the following formula:

W
⁢

⁢
T
⁢

⁢

Assignees

• Schott Ag

Inventors

• Witzmann André
• Trinks Volker
• Lenz Thomas

Classifications

• C03C3/093

  containing zinc or zirconium · CPC title

• C03B33/06

  Cutting or splitting glass tubes, rods, or hollow products (C03B33/09 takes precedence) · CPC title

• A61J1/05

  for collecting, storing or administering blood, plasma or medical fluids {(multiple bags systems for separating or storing blood components A61M1/0209); Infusion or perfusion containers} · CPC title

• A61M5/3129

  Syringe barrels (A61M5/3205 and A61M5/50 take precedence) · CPC title

• A61J1/06

  Ampoules or carpules (syringe ampoules or carpules A61M5/28) · CPC title