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WO2003018491A1 - Aiguille d'etirage de tube, procede et utilisation pour les procedes vello et d'etirage par le bas - Google Patents

Aiguille d'etirage de tube, procede et utilisation pour les procedes vello et d'etirage par le bas Download PDF

Info

Publication number
WO2003018491A1
WO2003018491A1 PCT/EP2002/008903 EP0208903W WO03018491A1 WO 2003018491 A1 WO2003018491 A1 WO 2003018491A1 EP 0208903 W EP0208903 W EP 0208903W WO 03018491 A1 WO03018491 A1 WO 03018491A1
Authority
WO
WIPO (PCT)
Prior art keywords
drawing needle
vello
tube
down draw
tube drawing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2002/008903
Other languages
German (de)
English (en)
Inventor
Erhard Dick
Erich Fischer
Roland Fuchs
Markus Riedl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schott AG
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
Schott Glaswerke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Zeiss AG, Schott Glaswerke AG filed Critical Carl Zeiss AG
Publication of WO2003018491A1 publication Critical patent/WO2003018491A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/04—Forming tubes or rods by drawing from stationary or rotating tools or from forming nozzles

Definitions

  • the invention relates to a tube drawing needle for the vello and down draw method.
  • Vello tube drawing process is a vertical drawing process for glass tubes, which is drawn downwards from an annular nozzle.
  • the feeder channel there is a cylindrical opening with a nozzle through which the glass melt can flow out via a vertical cone which is adjustable in height and funnel-shaped.
  • the cone is hollow and connected to the blowing air with an extension tube.
  • the down draw method works exactly like the vello method with the difference that the tube is not deflected into the horizontal but is pulled straight down vertically.
  • the conventional pipe drawing needle has a ceramic core to stabilize the shape of the sleeve. Due to the different thermal expansion of the materials used, the casing is deformed in the shaping area. This leads to rheological disturbances, which cause optical impairment in the product.
  • a disadvantage of the pipe pulling needle currently used is the high heat removal in the cone area. The heat removal leads to a cooling of the glass / shell interface and thus to partial devitrification. The devitrification leads to faults in the product in the form of crystals and drawing strips. Cristobalite crystals are usually formed.
  • the object of the present invention is to provide a device and a method which prevents crystal formation in the glass in the Vello and Down Draw methods.
  • the object of the present invention is achieved by a tubular drawing needle which is hollow in the area of the cones and the shaft is covered with a film in this area, the film consisting of the same material as the sheath. Rheological disorders are prevented with the pipe pulling needle according to the invention. This prevents visual impairments in the product. Less heat is extracted in the cone area. This minimizes cooling at the glass / shell interface and prevents partial devitrification. Surprisingly, a product without crystals and drawing strips is obtained.
  • a preferred embodiment of the invention is a pipe drawing needle, the cone having a support ring in the lower region.
  • a further preferred embodiment is a pipe drawing needle, the sleeve of the pipe drawing needle consisting of temperature-resistant material, preferably metal, particularly preferably noble metal. Very good results are achieved with precious metal as a temperature-resistant material.
  • the object is further achieved by a method for pulling a tube or rod, glass melt being passed over a tube pulling needle according to the invention.
  • Figure 1 shows a longitudinal section through a pipe pulling needle according to the invention.
  • Figure 1 shows a pipe drawing needle.
  • the pipe drawing needle has an upper cone (2a) and a lower cone (2b).
  • the pipe drawing needle is hollow in the area of the cones (2).
  • the shaft (1) is encased in the area of the upper cone (2a) with a film (3).
  • the film consists of the same material as the casing (4), particularly preferably of a noble metal such as platinum.
  • a support ring (5) is located between the upper and lower cone (2).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metal Extraction Processes (AREA)
  • Glass Compositions (AREA)

Abstract

L'invention concerne une aiguille d'étirage de tube qui est creuse dans la zone supérieure des cônes et dont le corps est enveloppé dans cette zone d'un film qui est constitué du même matériau que la gaine. L'invention concerne également un procédé pour l'étirage d'un tube ou d'une barre, selon lequel la masse de verre fondue est conduite par-dessus une aiguille d'étirage de tube. L'invention concerne enfin l'utilisation d'une aiguille d'étirage de tube dans les procédés Vello et d'étirage par le bas.
PCT/EP2002/008903 2001-08-24 2002-08-09 Aiguille d'etirage de tube, procede et utilisation pour les procedes vello et d'etirage par le bas Ceased WO2003018491A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10141586.9 2001-08-24
DE2001141586 DE10141586C1 (de) 2001-08-24 2001-08-24 Rohrziehnadel, Verfahren und Verwendung für das Vello und Down Draw Verfahren

Publications (1)

Publication Number Publication Date
WO2003018491A1 true WO2003018491A1 (fr) 2003-03-06

Family

ID=7696526

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/008903 Ceased WO2003018491A1 (fr) 2001-08-24 2002-08-09 Aiguille d'etirage de tube, procede et utilisation pour les procedes vello et d'etirage par le bas

Country Status (2)

Country Link
DE (1) DE10141586C1 (fr)
WO (1) WO2003018491A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10683226B2 (en) 2016-05-06 2020-06-16 Corning Incorporated Bell assemblies for glass tubing manufacturing and glass tubing manufacturing apparatuses comprising the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005031657B4 (de) * 2005-07-05 2011-02-03 Schott Ag Verfahren zur Herstellung von Al-Silikat-Glasrohren zur Verwendung als Halbzeug zur Herstellung von Glaskeramik-Rohren
DE102008006015A1 (de) 2008-01-25 2009-07-30 Diether Böttger Verfahren und Vorrichtung zur Temperaturkontrolle einer Dosier-Ziehnadel
DE102008009811A1 (de) 2008-02-19 2009-08-20 Diether Böttger Verfahren und Vorrichtung zur Steuerung der Temperatur eines Glasrohformkörpers
DE102014111646A1 (de) 2014-08-14 2016-02-18 Schott Ag Verfahren zur Herstellung von Glasrohren sowie Verwendungen hierzu

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6274525B1 (en) * 1998-01-29 2001-08-14 Schott Glas Process for making a high temperature-resistant ceramic material with an adjustable thermal expansion coefficient and method of use of same
US20010055930A1 (en) * 2000-03-31 2001-12-27 Franz Ott Method of making a halogen lamp and other analogous lamps and objects, and apparatus for the manufacture thereof
WO2002044115A2 (fr) * 2000-11-30 2002-06-06 Schott Glas Element metallique revetu destine a la fabrication de verre

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6274525B1 (en) * 1998-01-29 2001-08-14 Schott Glas Process for making a high temperature-resistant ceramic material with an adjustable thermal expansion coefficient and method of use of same
US20010055930A1 (en) * 2000-03-31 2001-12-27 Franz Ott Method of making a halogen lamp and other analogous lamps and objects, and apparatus for the manufacture thereof
WO2002044115A2 (fr) * 2000-11-30 2002-06-06 Schott Glas Element metallique revetu destine a la fabrication de verre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10683226B2 (en) 2016-05-06 2020-06-16 Corning Incorporated Bell assemblies for glass tubing manufacturing and glass tubing manufacturing apparatuses comprising the same

Also Published As

Publication number Publication date
DE10141586C1 (de) 2002-10-24

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