Device for producing glass tubes by a Vello or down-draw method, method for producing glass tubes by a Vello or down-draw method and glass tubes
AssigneeSchott AG
InventorsStephan Tratzky, Volker Trinks, Jürgen Eckl, Thomas Männer, Thomas Zimmert
Life of this patent
Estimating the term…
Abstract
A glass tube has a center axis, where for the glass tube a specific cross-sectional plane is defined which includes the center axis and which is parallel to the center axis. Within the specific cross-sectional plane, for each pair of outer diameters d1 and d2 of the glass tube at any two arbitrarily selected first axial position x1 and second axial positions x2 along the center axis, respectively, the following relation is 60 or smaller: |(d2−d1)/(x2−x1)|*(10{circumflex over ( )}6 mm)/d1.
Claims20
A glass tube having a center axis, wherein for the glass tube a specific cross-sectional plane is defined which comprises the center axis and which is parallel to the center axis, wherein, within the specific cross-sectional plane, for each pair of outer diameters d1 and d2 of the glass tube at any two arbitrarily selected first axial position x1 and second axial positions x2 along the center axis, respectively, the following relation is 60 or smaller:
- |(d2−d1)/(x2−x1)|*(10{circumflex over ( )}6mm)/d1.
A glass tube having a center axis, wherein for the glass tube a specific cross-sectional plane is defined which comprises the center axis and which is parallel to the center axis, wherein, within the specific cross-sectional plane, for each pair of outer diameters d1 and d2 of the glass tube at any two arbitrarily selected axial positions x1 and x2 along the center axis, at least one of the following is satisfied:
- (i) a relative change of the outer diameter,
- ❘
- "\[LeftBracketingBar]"
- d
-
- 2
- -
- d
-
- 1
- d
-
- 2
- ❘
- "\[RightBracketingBar]"
- ,
- with d2>d1, is 0.035 or less;
- or
- (ii) a ratio d1/d2, with d2≥d1, is 0.95 or greater.
Dependencies are inferred from the claim text.