WO2006048065A1 - Procede de fabrication de verre plat - Google Patents

Procede de fabrication de verre plat Download PDF

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Publication number
WO2006048065A1
WO2006048065A1 PCT/EP2005/009360 EP2005009360W WO2006048065A1 WO 2006048065 A1 WO2006048065 A1 WO 2006048065A1 EP 2005009360 W EP2005009360 W EP 2005009360W WO 2006048065 A1 WO2006048065 A1 WO 2006048065A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
bath
glass
float
glass ribbon
Prior art date
Application number
PCT/EP2005/009360
Other languages
German (de)
English (en)
Inventor
Bernd Löffelbein
Andreas Langsdorf
Christian Kunert
Frank-Thomas Lentes
Ulrich Lange
Original Assignee
Schott 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 Schott Ag filed Critical Schott Ag
Publication of WO2006048065A1 publication Critical patent/WO2006048065A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/26—Outlets, e.g. drains, siphons; Overflows, e.g. for supplying the float tank, tweels
    • C03B5/265—Overflows; Lips; Tweels
    • C03B5/267—Overflows; Lips; Tweels specially adapted for supplying the float tank
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall

Definitions

  • the invention relates to a process for the production of flat glass by the float process.
  • a glass melt is allowed to flow via a lip-shaped spout in the float chamber onto a bath of molten metal, typically tin or a tin alloy, leaving a glass ribbon forms.
  • This spout can have different widths up to the glass band width.
  • This glass ribbon if it is to be thinner than the resulting equilibrium thickness of about 6 to 7 mm stretched on the float bath by means of side rollers and a suitable take-off speed, cooled over the length of the float bath and the stretched glass ribbon is finally on the side opposite the spout lifted from the float bath and removed from the float chamber.
  • No. 3,555,295 describes a process in which a particularly flat float bath is used.
  • glass is placed on a slide table, on the surface of which is a layer of liquid metal, the width of which, however, is less than the width of the glass sheet.
  • the metal layer is only about 4 mm thick, so that due to the small amount of metal and precious metals can be used.
  • US Pat. No. 3,721,543 discloses a method for producing wired glass in which the wire mesh in the float chamber is worked into the still soft glass ribbon.
  • the glass ribbon is temporarily raised by means of a sliding surface, on the surface of which a film of liquid tin is produced, so that the introduction of the wire mesh can be made horizontally below the surface of the glass ribbon.
  • the liquid glass is poured through a gap or slit on the float bath.
  • This gap is formed by a lip, above which a flap or throttle is arranged, with which the thickness of the liquid glass stream flowing over the lip can be adjusted.
  • the lip and the throttle are attacked over time, so that an accurate and uniform gap width can not be met.
  • the lip wear also has the consequence that wear particles arrive as impurities in the useful range of the glass ribbon. While the throttle can still be replaced relatively easily, this is much more difficult with the lip.
  • the object of the invention is therefore to find a process for the production of flat glass by the float process in which the lifting of the glass ribbon is significantly improved by the float bath and with the wear of the lip can be reduced.
  • the principle of the invention thus consists in that the glass band also in places where it can not be carried by the horizontal bath level so in the lift-off and / or at the top of the lip-shaped spout over which the liquid glass reaches the float bath (Spout -Lip), is passed over a sliding surface on which a liquid film is located.
  • the liquid for the film has the same composition as the bath liquid, in particular it is the bath liquid itself. In this way, one does not need to apply and maintain separate supplies of the liquid.
  • the sliding surface is preferably arranged inside the float chamber, because then separate means for protecting the liquid from oxidation can be dispensed with. But it is of course also possible to arrange the sliding surface with appropriate protection of the liquid outside the actual float chamber.
  • the liquid film between the glass and the sliding surface or the lip-shaped spout can be produced most favorable if one uses an open-pore material for these bodies or at least on their glass surface facing a layer of such material provides through the pores of the liquid or the liquid metal is supplied to produce the liquid film.
  • the supply of the liquid generally takes place from the rear side as well.
  • liquid if preferred, consists of the metal of the float bath, a high specific gravity and also a high specific gravity has higher viscosity than gas, porosity and pore size are not as critical as in gas film levitation.
  • a porous material a material which is provided with a multiplicity of bores or slots through which the film-forming liquid or the liquid metal can be supplied to the surface.
  • the pressure under which the liquid can be supplied is surprisingly low and is, of course, depending on the pore size and the thickness or the pressure drop within the material to be flowed at 0.05 to 1, 0 bar.
  • porous material Any material that is inert to the liquid, the surrounding atmosphere and the prevailing temperature can be used as the porous material.
  • porous ceramics for example Al 2 O 3 , Z 1 O 2 , aluminosilicates, porous metals, for example tungsten sintered metal, porous graphite and similar materials.
  • the liquid can also be used particularly well to influence the temperature of the sliding glass ribbon on her, depending on the thickness and temperature of the glass ribbon can be heated or cooled as desired.
  • the outflowing liquid film is preferably allowed to flow back into the float bath and also removes the liquid required for producing the liquid film from the float bath. Conveniently, a filtration of the liquid is made to remove solid particles.
  • the circulation of the bath liquid of the bath through the cleaning device to the porous material can be made with conventional pumps, such as electromagnetic liquid metal pumps, as they are also used in the circulation of Floatbad metal.
  • the sliding surface is advantageously formed as an inclined plane or curved surface, to effect a gentle lifting of the glass from the float bath.
  • the inclined plane with which the glass ribbon is lifted off the float bath preferably contacts the liquid of the float bath with its front end or even dives into it. This makes it possible to achieve a smooth transition from the float bath to the sloping plane. It is also advantageous if the oblique plane at its rear end (seen in the strip running direction) can be transferred to a horizontal plane, whereby the glass strip can be removed horizontally from the float chamber.
  • the glass ribbon unlike other known methods, is supported all the way in the float chamber and the viscosity can be adjusted very accurately by temperature control of the liquid film, the risk of surface damage to the underside of the glass ribbon by the take-off rolls arranged outside the float chamber is practically nonexistent available.
  • FIG. 1 is a schematic diagram of a float glass plant with an embodiment of the inlet and lifting part according to the invention
  • Fig. 2 shows another embodiment of the lift-off
  • Fig. 3 shows a lift-off member having a groove which prevents excess liquid from passing over the tub rim.
  • liquid glass 1 flows from a forehearth 2 of the melting tank over the lip-shaped spout 3 onto the metal bath 5.
  • the mass flow of liquid glass which is poured onto the metal bath 5 is set by means of the displaceable weir 4.
  • the liquid glass spreads and forms a glass ribbon 1, which is pulled out by means not shown top roller and by at least one withdrawal roller 7 outside the float chamber and transported via the float 5.
  • the glass ribbon 1 is lifted from the metal bath 5 and withdrawn from the float chamber, whereupon then join the other usual process steps such as stress-free cooling, cutting, etc.
  • the lifting takes place via an inclined plane 8, through which the glass is gently lifted and lifted over the edge of the float basin.
  • the spout 3 and the inclined plane 8 are made of porous material. Below the spout 3 and inclined plane 8 are chambers 9 and 10, is pumped into the liquid metal of the metal bath 5 under pressure. The liquid metal penetrates through the porous material and forms between the top of the porous material and the bottom of the glass ribbon 1, a liquid film on which the glass ribbon 1 slides without contact to the porous material.
  • Fig. 2 shows another embodiment of the end part of a float glass tray.
  • the liquid metal 5 of the float bath is sucked by the pump 10 through the conduit 9 and, after passing through a filter, not shown, enters the chamber 11, from where it is forced outwards by the porous material 12 and forms a film on which Glass ribbon 1, which is pulled by the withdrawal roller 7 from the bath, can slide.
  • the porous material 12 is arranged such that its surface has a slope in the direction of the liquid metal 5 of the float bath. This avoids that liquid material can pass over the edge 13 of the float tray.
  • the porous material 12 has been provided with a channel 14, which can receive liquid metal, which does not flow back over the gradient in the float bath, and laterally leads back into the float bath ,
  • both the glass flowing on the float bath and the lifted glass ribbon can be specifically thermally influenced by the temperature of the liquid that due to high density of the liquid in contrast to Gastisch, on which the glass floats on a gas cushion, only small flow rates of liquid and thus a low pumping power is required and that by means of a purified liquid any located on the underside of the glass ribbon impurities at the discharge end of the glass ribbon by flushed with the liquid film and thus be removed.

Landscapes

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

Abstract

Procédé de fabrication de verre plat par flottage, selon lequel une surface de glissement (8) est placée, vue dans le sens de déplacement de la bande de verre (1), à l'extrémité du bain de flottage (5) dans la zone de soulèvement. Un film liquide est produit entre la surface supérieure de la surface de glissement et la face inférieure de la bande de verre (1) et / ou un film de liquide est produit entre la goulotte (lèvre) (3) et la face inférieure de la masse de verre fondu (11). Le liquide utilisé pour le film de liquide est de préférence le métal liquide du bain de flottage. La surface de glissement et / ou la lèvre sont constituées de préférence d'une matière à pores ouverts dans lesquels le liquide est comprimé.
PCT/EP2005/009360 2004-11-04 2005-08-31 Procede de fabrication de verre plat WO2006048065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004053286.9 2004-11-04
DE200410053286 DE102004053286B4 (de) 2004-11-04 2004-11-04 Verfahren zur Herstellung von Flachglas nach dem Floatverfahren

Publications (1)

Publication Number Publication Date
WO2006048065A1 true WO2006048065A1 (fr) 2006-05-11

Family

ID=35094080

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/009360 WO2006048065A1 (fr) 2004-11-04 2005-08-31 Procede de fabrication de verre plat

Country Status (2)

Country Link
DE (1) DE102004053286B4 (fr)
WO (1) WO2006048065A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110937783A (zh) * 2019-10-23 2020-03-31 北京玻锐特科技有限公司 一种气体悬浮法原片玻璃成型制作系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1365777A (fr) * 1962-09-29 1964-07-03 Glaverbel Procédé d'affinage du verre et de fabrication continue de verre en feuille
GB983556A (en) * 1961-03-13 1965-02-17 Saint Gobain Improvements in or relating to processes for the manufacture of sheet or plate glass
US3323890A (en) * 1962-10-16 1967-06-06 Glaverbel Process and plant for manufacturing flat glass on a molten metal and solid support bed
US3721543A (en) * 1968-06-14 1973-03-20 Floatglas Gmbh Float glass apparatus with means for inserting wire
JP2003300739A (ja) * 2002-03-06 2003-10-21 Carl Zeiss:Fa フロートガラスを製造する際にスパウトリップを介して溶融ガラスを供給する装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL289568A (fr) * 1962-03-01 1900-01-01
FR96106E (fr) * 1964-04-11 1972-05-19 Libbey Owens Ford Co Procédé de manutention du verre plat.
JPS4913605B1 (fr) * 1966-07-18 1974-04-02
DE2654242C3 (de) * 1976-11-30 1981-01-22 Vsesojuznyj Nautschno-Issledovatelskij Institut Technitscheskogo I Specialnogo Stroitelnogo Stekla Vniitechstrojsteklo, Saratow (Sowjetunion) Verfahren zur Herstellung von Tafelglas mit Alkali- und Alumosilikat-Zusammensetzung
US5090987A (en) * 1991-03-19 1992-02-25 Glasstech, Inc. Apparatus for delivering newly formed glass sheet strip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB983556A (en) * 1961-03-13 1965-02-17 Saint Gobain Improvements in or relating to processes for the manufacture of sheet or plate glass
FR1365777A (fr) * 1962-09-29 1964-07-03 Glaverbel Procédé d'affinage du verre et de fabrication continue de verre en feuille
US3323890A (en) * 1962-10-16 1967-06-06 Glaverbel Process and plant for manufacturing flat glass on a molten metal and solid support bed
US3721543A (en) * 1968-06-14 1973-03-20 Floatglas Gmbh Float glass apparatus with means for inserting wire
JP2003300739A (ja) * 2002-03-06 2003-10-21 Carl Zeiss:Fa フロートガラスを製造する際にスパウトリップを介して溶融ガラスを供給する装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110937783A (zh) * 2019-10-23 2020-03-31 北京玻锐特科技有限公司 一种气体悬浮法原片玻璃成型制作系统

Also Published As

Publication number Publication date
DE102004053286B4 (de) 2007-09-20
DE102004053286A1 (de) 2006-05-11

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