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WO2003018491A1 - Tube drawing needle, method and use for the vello and down draw methods - Google Patents

Tube drawing needle, method and use for the vello and down draw methods 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)
French (fr)
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/en
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

The invention relates to a tube drawing needle which is hollow in the upper region of the cones and whose shank is surrounded in said region by a film which is made of the same material as the envelope. The invention also relates to a method for extracting a tube or a bar, whereby the glass melt is guided over a tube drawing needle. The invention finally relates to the use of a tube drawing needle in the Vello and Down Draw methods.

Description

Rohrziehnadel, Verfahren und Verwendung für das Vello und Down Draw Pipe drawing needle, method and use for the vello and down draw

Verfahrenmethod

Die Erfindung betrifft eine Rohrziehnadel für das Vello und Down Draw Verfahren.The invention relates to a tube drawing needle for the vello and down draw method.

Vello Rohrziehverfahren ist ein Vertikalziehverfahren für Glasröhren, bei dem aus einer Ringdüse nach unten abgezogen wird. Im Speiserkanal befindet sich am Boden eine zylindrische Öffnung mit Düse durch die die Glasschmelze über einen in der Höhe verstellbaren nach unten trichterförmig erweiterten Vertikalkegel ausfließen kann. Der Kegel ist hohl und mit einem Verlängerungsrohr an die Blasluft angeschlossen. Dadurch wird die um den Ventilkörper befindliche Glasmasse offengehalten und kann als Rohr nach unten in einen temperaturgeregelten Schacht abgezogen werden. Dies geschieht, bevor das Rohr freihängend oder mit Hilfe einer Führung in die Horizontale umgelenkt und von einer Ziehmaschine abgezogen wird.Vello tube drawing process is a vertical drawing process for glass tubes, which is drawn downwards from an annular nozzle. In 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. As a result, the glass mass located around the valve body is kept open and can be pulled down as a tube into a temperature-controlled shaft. This happens before the pipe is suspended freely or with the help of a guide it is redirected into the horizontal and pulled off by a drawing machine.

Das Down Draw Verfahren funktioniert genauso wie das Vello Verfahren mit dem Unterschied, dass das Rohr nicht in die Horizontale umgelenkt wird sondern direkt vertikal nach unten abgezogen wird.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.

Die herkömmliche Rohrziehnadel besitzt zur Formstabilisierung der Hülle einen Keramikkern. Durch die unterschiedliche thermische Ausdehnung der verwendeten Materialien erfolgt eine Verformung der Hülle im Formgebungsbereich. Dies führt zu rheologischen Störungen, welche optische Beeinträchtigung im Produkt hervorrufen. Nachteilig bei der zur Zeit verwendeten Rohrziehnadel ist der hohe Wärmeentzug im Konusbereich. Der Wärmeentzug führt zu einer Abkühlung der Grenzfläche Glas/Hülle und dadurch zur partiellen Entglasung. Die Entglasung führt zu Störungen im Produkt in Form von Kristallen und Ziehstreifen. Es entstehen üblicherweise Cristobalit Kristalle.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.

Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung und ein Verfahren bereitzustellen, womit beim Vello und Down Draw Verfahren die Kristallbildung im Glas verhindert wird. Die Aufgabe der vorliegenden Erfindung wird gelöst durch eine Rohrziehnadel, die im Bereich der Konen hohl ist und der Schaft in diesem Bereich mit einer Folie ummantelt ist, wobei die Folie aus dem gleichen Material wie die Hülle besteht. Mit der erfindungsgemäßen Rohrziehnadel werden rheologische Störungen verhindert. Dadurch werden optische Beeinträchtigungen im Produkt verhindert. Im Konusbereich entsteht ein geringerer Wärmeentzug. Dadurch wird die Abkühlung an der Grenzfläche Glas/Hülle minimiert und eine partielle Entglasung verhindert. Es wird überraschenderweise ein Produkt ohne Kristalle und Ziehstreifen erhalten.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.

Eine bevorzugte Ausgestaltung der Erfindung ist eine Rohrziehnadel, wobei der Konus im unteren Bereich einen Stützring aufweist.A preferred embodiment of the invention is a pipe drawing needle, the cone having a support ring in the lower region.

Eine weitere bevorzugte Ausgestaltung ist eine Rohrziehnadel, wobei die Hülle der Rohrziehnadel aus temperaturfestem Werkstoff, bevorzugt Metall, besonders bevorzugt Edelmetall besteht. Mit Edelmetall als temperaturfester Werkstoff werden sehr gute Ergebnisse erzielt.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.

Die Aufgabe wird weiter durch ein Verfahren zum Ziehen eines Rohres oder Stabs gelöst, wobei Glasschmelze über eine erfindungsgemäße Rohrziehnadel geführt wird.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.

Erfindungsgemäß ist die Verwendung einer Rohrziehnadel beim Vello und Down Draw Verfahren vorgesehen.According to the invention, the use of a pipe drawing needle in the Vello and Down Draw processes is provided.

Die Erfindung wird anhand einer Zeichnung näher erläutert. Die Zeichnung besteht aus Figur 1.The invention is explained in more detail with reference to a drawing. The drawing consists of Figure 1.

Figur 1 zeigt einen Längsschnit durch eine erfindungsgemäßen Rohrziehnadel.Figure 1 shows a longitudinal section through a pipe pulling needle according to the invention.

Figur 1 zeigt eine Rohrziehnadel. Die Rohrziehnadel weist einen oberen Konus (2a) und einen unteren Konus (2b) auf. Im Bereich der Konen (2) ist die Rohrziehnadel hohl. Der Schaft (1 ) ist in Bereich des oberen Konus (2a) mit einer Folie (3) ummantelt. Die Folie besteht aus dem gleichen Material wie die Hülle (4), besonders bevorzugt aus einem Edelmetall wie Platin. Zwischen dem oberen und unteren Konus (2) befindet sich ein Stützring (5). 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).

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS 1. Rohrziehnadel, die im oberen Bereich der Konen (2) hohl ist und der Schaft (1 ) in diesem Bereich mit einer Folie (3) ummantelt ist, wobei die Folie aus dem gleichen Material wie die Hülle (4) besteht.1. Pipe drawing needle, which is hollow in the upper area of the cones (2) and the shaft (1) is covered in this area with a film (3), the film consisting of the same material as the sheath (4). 2. Rohrziehnadel nach Anspruch 1 , wobei der Konus (2) im unteren Bereich einen Stützring (5) aufweist.2. Pipe drawing needle according to claim 1, wherein the cone (2) has a support ring (5) in the lower region. 3. Rohrziehnadel nach Anspruch 1 oder 2, wobei die Hülle der Rohrziehnadel aus temperaturfestem Werkstoff, bevorzugt Metall, besonders bevorzugt Edelmetall besteht.3. Pipe drawing needle according to claim 1 or 2, wherein the sleeve of the pipe drawing needle consists of temperature-resistant material, preferably metal, particularly preferably noble metal. 4. Verfahren zum Ziehen eines Rohres oder Stabs, wobei Glasschmelze über eine Rohrziehnadel nach mindestens einem der Ansprüchen 1 bis 3 geführt wird.4. A method for drawing a tube or rod, wherein glass melt is passed over a tube drawing needle according to at least one of claims 1 to 3. 5. Verwendung einer Rohrziehnadel nach einem der Ansprüche 1 bis 3 beim Vello und Down Draw Verfahren. 5. Use of a pipe drawing needle according to one of claims 1 to 3 in the vello and down draw method.
PCT/EP2002/008903 2001-08-24 2002-08-09 Tube drawing needle, method and use for the vello and down draw methods Ceased WO2003018491A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10141586.9 2001-08-24
DE2001141586 DE10141586C1 (en) 2001-08-24 2001-08-24 Tube drawing needle used in a Vello or Down Draw process comprises a cone which is hollow in its upper region, and a shaft surrounded by a film which is made from the same material as the casing

Publications (1)

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

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PCT/EP2002/008903 Ceased WO2003018491A1 (en) 2001-08-24 2002-08-09 Tube drawing needle, method and use for the vello and down draw methods

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DE (1) DE10141586C1 (en)
WO (1) WO2003018491A1 (en)

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 (en) * 2005-07-05 2011-02-03 Schott Ag Process for the production of al-silicate glass tubes for use as semi-finished products for the production of glass-ceramic tubes
DE102008006015A1 (en) 2008-01-25 2009-07-30 Diether Böttger Controlling of temperature during the production of glass tubes according to Vello and Down Draw method, by transporting a glass melt, if necessary after a pretreatment in a stirrer cell and cooling in a cooling zone, into a needle cell
DE102008009811A1 (en) 2008-02-19 2009-08-20 Diether Böttger Controlling the temperature during the production of glass tubes in Vello and down-draw methods, comprises transferring glass melt into glass-tube needle cell, dosing the melt by nozzle ring on dosing draw needle, and heating the needle
DE102014111646A1 (en) 2014-08-14 2016-02-18 Schott Ag Process for the production of glass tubes and uses thereof

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 (en) * 2000-11-30 2002-06-06 Schott Glas Coated metal element used for producing glass

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 (en) * 2000-11-30 2002-06-06 Schott Glas Coated metal element used for producing glass

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 (en) 2002-10-24

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