WO2002081389A1 - Procede et dispositif pour produire des barres de coulee de verre presentant un profil de section polygonal - Google Patents

Procede et dispositif pour produire des barres de coulee de verre presentant un profil de section polygonal Download PDF

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Publication number
WO2002081389A1
WO2002081389A1 PCT/EP2002/003229 EP0203229W WO02081389A1 WO 2002081389 A1 WO2002081389 A1 WO 2002081389A1 EP 0203229 W EP0203229 W EP 0203229W WO 02081389 A1 WO02081389 A1 WO 02081389A1
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WO
WIPO (PCT)
Prior art keywords
mold
wall
glass
gas
glass strand
Prior art date
Application number
PCT/EP2002/003229
Other languages
German (de)
English (en)
Inventor
Christian Kunert
Ulrich Lange
Andreas Langsdorf
Matthias Brinkmann
Original Assignee
Schott Glas
Carl-Zeiss-Stiftung Trading As Schott Glas
Carl-Zeiss-Stiftung
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 Schott Glas, Carl-Zeiss-Stiftung Trading As Schott Glas, Carl-Zeiss-Stiftung filed Critical Schott Glas
Publication of WO2002081389A1 publication Critical patent/WO2002081389A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
    • C03B40/04—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it using gas
    • 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 the production of glass strands or glass rods produced therefrom.
  • Crystallization-insensitive glasses can be cooled down to comparatively low temperatures without the formation of crystals, at which the glass melt has a relatively high viscosity of over 10 5 dPas.
  • a glass strand can be continuously withdrawn from the melt from such viscous glass melts.
  • the cross-sectional shape of the strand can be adjusted well here via the shape of the opening from which the molten glass emerges.
  • Glasses susceptible to crystallization must be processed at temperatures above the crystal formation temperature of the glasses. Most of the time the glass viscosity at these temperatures is below 1000 dPas and therefore too low for direct strand forming. Therefore, methods are used in which the liquid glass flows into a mold which is usually water-cooled and is open at the bottom. The glass solidifies inside the mold, which is then continuously pulled down as a strand.
  • EP 0 738 696 A1 describes a device for shaping glass rods.
  • the glass rod is shaped in a mold with a cylindrical inner wall made of porous material, and a gas is forced through the pores of the wall.
  • a gas film is formed between the outer wall surface of the glass rod and the inner wall surface of the mold, with which a perfect outer surface of the glass rod being created is to be achieved.
  • US 3,298,808 A also describes a device for producing sleeves or rods made of glass.
  • a glass rod is shaped in a mold, the wall of which is porous, so that in turn a gas film is formed between the outer wall surface of the glass object and the inner wall surface of the mold. This is intended to increase the life of the mold.
  • the invention has for its object to provide a method and an apparatus with which glass strands or glass rods can be produced, the cross-sectional shape of which deviates from the circular shape, in particular of such strands or rods which have sharp-edged profiles with small edge radii.
  • the inventors recognized the following: In the case of molds whose cross-section deviates from the circular shape and approximates a polygon, for example a square, the heat removal in the corners of the mold is greater than in the other areas. The glass solidifies in the corners first. During further cooling, very high voltages form in the corner areas of the glass strand, which lead to the corners flaking off and thus to the destruction of the glass rod. This effect increases with decreasing radius of curvature of the polygon corners.
  • the basic idea of the invention is therefore to avoid the preferred cooling of the corner regions of the glass strand within the mold. Accordingly, a gas is introduced at least in the corner regions of the glass strand between its outer surface and the inner surface of the mold wall, so that a gas film forms between the two. The gas emerges from the surface of the mold wall.
  • the mold wall can be made of a porous material, at least in the sensitive areas, namely the corner areas. The material can be graphite or sintered metal, for example.
  • the mold wall or the porous areas are acted upon from the outside with a compressed gas, for example with compressed air, which settles through the wall and emerges on the inner surface.
  • the thickness of the wall to be flowed through by the gas can be reduced in the corner regions, for example by bores or by milling on the side of the wall facing away from the glass.
  • the above-mentioned gas film builds up between the inner wall of the mold and the outer surface of the glass strand, which reduces the contact between the glass strand and the inner surface of the mold wall, and thus also the heat dissipation into the mold wall.
  • the main advantage of the invention is that the cooling of the corner areas of the glass strand is delayed. This avoids high voltages in this area. At the same time, however, the center of the flank between two corner areas is cooled to the necessary extent.
  • the entire length of the glass strand can be surrounded by a gas film.
  • the arrangement can be such that a relatively high gas flow is introduced into the space between the mold and the glass strand in the corner areas, and a relatively small gas flow in the intermediate corner areas. It is essential that the mold wall draws relatively little heat from the glass strand in the corner areas, but that there is a good heat exchange between the glass and the mold wall in the intermediate corner areas.
  • Thin exhaust air ducts can be worked into the inside of the mold wall parallel to the edges of the mold. This ensures that from a certain distance from the edge of the mold no more gas flows out of the wall, since the gas flowing through the wall is then discharged in these channels and no longer flows between the glass and the mold wall. This allows you to create an area with very good glass-wall contact and good cooling between two adjacent exhaust air ducts. This is particularly necessary for glasses that have to be processed very hot, so that a very large amount of heat has to be dissipated in the mold.
  • the width of the exhaust air ducts should be chosen so small that the liquid glass cannot flow into the ducts due to its surface tension, because otherwise undesired structures will form on the rod surface and the glass rod can become lodged in the mold.
  • the gas inlet and the gas discharge can be coordinated. A gas is thus introduced locally in the corner areas, so that a gas film builds up there. At the same time, the exhaust air ducts ensure that gas is discharged from the space between two corner areas.
  • further ventilation channels can be incorporated in the mold wall, which have a connection to the exhaust air channels. This may be necessary with high gas quantities in order to offer the gases escaping from the exhaust air ducts a simple way out of the device.
  • the inner mold wall provided with the structures mentioned is surrounded by a cooling jacket.
  • the mold wall and cooling jacket are in intimate contact to ensure good heat transfer.
  • Gas, preferably air, a gas-water mixture, water or another suitable cooling medium can be used as the coolant for the cooling jacket.
  • Air, moist air, nitrogen or argon is preferably used as the gas with which the gas film between the mold wall and the glass rod being formed is prevented. Other gases or gas mixtures can also be used.
  • glass strands can also be produced continuously with sharp-edged profiles, namely with edge radii of less than 2 mm and from crystallization-sensitive glasses with high linear expansion coefficients of more than 5 • 10 " ° 7K, without there being any chipping of edge areas.
  • FR 2 509 637 describes an apparatus for producing glass strands, a gas film being built up between the mold wall and the glass strand.
  • this involves glass strands with a circular cross-sectional profile.
  • the gas film is used there to create a fire-polished surface on the glass rod that must not show any scratches and therefore should not come into contact with solid surfaces.
  • Figure 1 shows a schematic representation of a mold in cross section.
  • Figure 2 shows on an enlarged scale and in cross section a section of a mold with a section of a glass rod.
  • Figure 3 shows an object similar to that of Figure 2, but with a different mold material.
  • FIG. 4 shows an object similar to that according to FIG. 1 with integrated exhaust air channels.
  • the mold 1 shown in FIG. 1 has a circumferential wall 2.
  • the inner surface 2.1 of the wall encloses a glass strand, not shown here.
  • the wall 2 has corner areas 2.3 and intermediate corner areas
  • the corner areas are provided with a fillet, so that the wall 2 has a much smaller thickness there.
  • a gas stream G is sent through the wall 2, which emerges in the relevant corner region, but on the inner surface 2.1 of the wall, and forms a gas film there between the inner surface 2.1 of the wall 2 and the outer surface of the glass strand.
  • FIGS. 2 and 3 The manner in which the gas flow passes through the wall 2 is illustrated in FIGS. 2 and 3.
  • the gas flow does the following: It avoids contact between the glass and the mold wall in the corner area, and thus heat removal and thus reduces heat removal.
  • the gas flow can be tempered. However, this is not absolutely necessary.
  • the mold wall 2 shown in Figure 2 is in the corner area 2.3 with holes
  • the holes 2.5 need not only be provided in the corner areas 2.3. They can also be provided in the intermediate corner areas 2.4. However, they can have larger diameters in the corner areas. In any case, care should be taken to ensure that gas is applied to the corner areas 2.3 to a greater extent than the intermediate corner areas 2.4.
  • the wall 2 of the mold is made of a porous material, for example graphite or sintered metal, with high thermal conductivity.
  • a pressurized gas source must be provided so that gas flows from outside to inside through wall 2. Compressed gas must therefore be applied to the outer surface of the mold wall in some way, for example in that the mold wall is surrounded by an outer jacket, gaps remaining in the region of the corners between the mold wall and the outer jacket and that compressed gas is introduced into these gaps , In the area outside the corner gaps, good heat dissipation must be ensured for the most intimate contact possible between the mold wall and the outer jacket.
  • the embodiment of a mold 1 shown in FIG. 4 has a wall 2 with exhaust air and ventilation channels 2.6 incorporated therein. These are located in the intermediate corner area 2.4.
  • the gas supply channels - for example the bores 2.5 shown in FIG. 2 - are not shown here. Nevertheless, they are present in some way, unless the mold wall itself is made of a porous material. It is therefore understood that gas is supplied in the corner regions 2.3 and is discharged through the channels 2.6 mentioned in the intermediate corner regions.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Glass Melting And Manufacturing (AREA)

Abstract

L'invention concerne la production de barres de coulée de verre présentant des profils de section polygonaux, à l'aide de coquilles présentant le même profil de section. Pour qu'il soit possible de produire sans problèmes des barres de coulée de verre dont les arêtes ne se cassent pas, on applique un film de gaz dans les zones angulaires de la barre de coulée de verre produite, entre la surface intérieure de la paroi de coquille et la surface extérieure de la barre de coulée de verre.
PCT/EP2002/003229 2001-04-05 2002-03-22 Procede et dispositif pour produire des barres de coulee de verre presentant un profil de section polygonal WO2002081389A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10116941.8 2001-04-05
DE2001116941 DE10116941C1 (de) 2001-04-05 2001-04-05 Verfahren und Vorrichtung zum Erzeugen von Glassträngen mit polygonförmigem Querschnittprofil

Publications (1)

Publication Number Publication Date
WO2002081389A1 true WO2002081389A1 (fr) 2002-10-17

Family

ID=7680469

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/003229 WO2002081389A1 (fr) 2001-04-05 2002-03-22 Procede et dispositif pour produire des barres de coulee de verre presentant un profil de section polygonal

Country Status (2)

Country Link
DE (1) DE10116941C1 (fr)
WO (1) WO2002081389A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298808A (en) * 1965-05-11 1967-01-17 Macks Elmer Fred Concentric foraminous shaping means for tubes or bars
EP0738689A1 (fr) * 1995-04-19 1996-10-23 Corning Incorporated Dispositif et procédé de formage de barres, en particulier en un matériau vitreux
EP0780344A2 (fr) * 1995-12-19 1997-06-25 Commissariat A L'energie Atomique Procédé et installation de sustentation d'une masse liquide par une couche gazeuse
JPH1059729A (ja) * 1996-08-16 1998-03-03 Sony Corp ガラスロッドの製造方法及びガラスロッドの製造装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509637A1 (fr) * 1981-07-17 1983-01-21 Commissariat Energie Atomique Procede de sustentation, de positionnement et de moulage sans contact de masses liquides permettant la solidification en forme de materiaux et application de ce procede a la mise en forme de materiaux en microgravite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298808A (en) * 1965-05-11 1967-01-17 Macks Elmer Fred Concentric foraminous shaping means for tubes or bars
EP0738689A1 (fr) * 1995-04-19 1996-10-23 Corning Incorporated Dispositif et procédé de formage de barres, en particulier en un matériau vitreux
EP0780344A2 (fr) * 1995-12-19 1997-06-25 Commissariat A L'energie Atomique Procédé et installation de sustentation d'une masse liquide par une couche gazeuse
JPH1059729A (ja) * 1996-08-16 1998-03-03 Sony Corp ガラスロッドの製造方法及びガラスロッドの製造装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
E. ROEDER ET AL.: "Strangpressen anorganischer Glasschmelzen", SPRECHSAAL, vol. 114, no. 5, May 1981 (1981-05-01), coburg, pages 340 - 343, XP002206915 *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 08 30 June 1998 (1998-06-30) *

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Publication number Publication date
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