WO2003074436A1 - Vorrichtung zum dosieren einer glasschmelze in einem speiserkanal einer floatanlage zur herstellung eines gefloateten glasbandes - Google Patents
Vorrichtung zum dosieren einer glasschmelze in einem speiserkanal einer floatanlage zur herstellung eines gefloateten glasbandes Download PDFInfo
- Publication number
- WO2003074436A1 WO2003074436A1 PCT/EP2003/002278 EP0302278W WO03074436A1 WO 2003074436 A1 WO2003074436 A1 WO 2003074436A1 EP 0302278 W EP0302278 W EP 0302278W WO 03074436 A1 WO03074436 A1 WO 03074436A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base body
- heating element
- gate valve
- glass
- different
- Prior art date
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
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/02—Forehearths, i.e. feeder channels
- C03B7/06—Means for thermal conditioning or controlling the temperature of the glass
- C03B7/07—Electric means
Definitions
- the invention relates to a device for dosing a glass melt in one
- Feeder channel of a float system for producing a floated glass ribbon which has at least one vertically adjustable locking slide (tweel).
- Small float systems or float systems for special glasses work with a single locking slide (tweel) with which the amount of glass melt transferred to the float bath is set.
- the feeder channels for soda-lime float systems usually have a free surface of the glass melt.
- the level of the glass melt is therefore approximately 20 to 50 mm above the lower edge of the cover stones of the feeder channel (so-called diving cover).
- the gate valves are suspended vertically adjustable in the feeder channel. If the channel width is constant, the channel cross-section can be varied by changing the height of the gate valve (distance from the bottom of the gate to the bottom gate gate valve).
- the gate valve is usually made of refractory material. Slip-cast and sintered silica glass ceramics are usually used for the gate valve
- the design of the bottom edge of the gate valve has a major influence on the quality of the floated glass ribbon (distortion, bubbles, etc.).
- the bottom of the gate valve is usually flat, but it can also be convex.
- the gate valve is made of fused silica
- the underside of the hot glass melt i.e. the underside inserted into the glass melt, heavily corroded.
- the surface geometry of the gate valve is changed by the corrosion (corrosion profiles, greater removal in the
- the glass quality of the floated glass deteriorates with increasing running time of the gate valve (distortions, bubbles, etc.). This is particularly the case with high-melting borosilicate glasses (alkali-free, low-alkali) or aluminosilicate glasses
- the shut-off valve made of silica glass ceramic is very short.
- the ceramic gate valve made of a noble metal alloy for example Pt or Pt / Rh 10
- the service life is particularly the usual temperatures of the glass melt from 1200 to 1400 ° C were found to be sufficient.
- a gate valve with a coating of an alloy with platinum and 10% by weight of rhodium or other precious metal alloys has the disadvantage that the coating material has a high thermal conductivity. This means that the gate valve has crystallization and devitrification on the sides and "corners".
- a temperature profile on the gate valve which cannot be influenced primarily, can change the process parameters, e.g. throughput, the surface quality is adversely affected because the gate valve is the last part of the unit that dips directly into the glass melt before the float bath.
- the feeder duct can become "stuck", so that in extreme cases the duct blocks can be damaged.
- the locking slide is provided with an electrical heater and can be set to a certain temperature.
- the heat is transported to the outer surface of the gate valve or generated there by normal heat conduction through the elements of the gate valve and a defined temperature is set thereon.
- the gate valve can consist of a refractory body that can be heated indirectly or directly. According to a possible variant of the invention, it can consist of slip-cast and sintered silica glass ceramic (fused silica).
- the base body is pocket-shaped and hollow and accommodates at least one radiant heating element.
- the outer surface of the base body with a coating or a coating, hereinafter generally called coating can consist of platinum or platinum alloys, for example with 5% by weight of gold.
- a design can be such that the radiant heating element heats up the inner surface of the base body.
- the coating of the gate valve i.e. of its basic body, extends over the maximum immersion depth of the gate valve in the glass melt in the feeder channel.
- the radiant heating can be in the form of radiant heating elements with different heating capacity can be made available. However, there is also the possibility of making the heating output adjustable and / or controllable.
- the choice of different refractory materials and the structure of the base body, in particular the wall thickness of the elements used, can also be used as further measures for setting a specific and uniform temperature profile on the outer surface of the gate valve.
- Layer thickness, the degree of coverage on the base body and the roughness of the coating affect the temperature profile.
- Gate valve surface is primarily convective, while on the side facing the float bath it is more dominated by the radiation.
- the temperature profile can also be set by directly heating the gate valve.
- the gate valve is covered with a precious metal
- a U-shaped heating element is applied to the base body.
- the base body is essentially cuboid and carries the U-shaped heating element with its side legs on the vertical narrow sides of the base body and its middle leg are applied to the lower region of the base body.
- the power is supplied in the simplest manner in that the side legs of the heating element are designed as connection contacts in the region of the upper edge of the locking slide.
- the heating element can reduce the function of the coating
- the middle leg of the heating element extends as a coating of platinum or an alloy of platinum over the maximum immersion depth of the gate valve in the glass melt.
- the base body can be accommodated in the heating element in such a way that the lower edge of the base body is convexly curved and is received by a pocket-shaped central leg of the U-shaped heating element.
- Cladding surface and various current feeds in the heating element are
- FIG. 1 shows a float system for the production of float glass in the transition region of the feeder channel with two locking slides to the float bath
- Fig. 2 shows a simplified cross section through an indirectly heated gate valve
- Fig. 3 is a perspective view of a gate valve with base body and applied electrical heating element.
- the glass is melted in a glass trough 1 0 melted and fed to a feeder channel 1 1, in which the refined glass melt 1 2 can be metered with a gate valve 20 facing an overflow stone 1 3.
- Averted from the overflow stone 1 3 is a further blocking slide 30 in the feeder channel 1 1, with which the glass flow in the feeder channel 1 1 can be released or interrupted.
- the overflow stone 13 is arranged on the initial wall 14 of a float bath, which is indicated with floor elements 15 and receives a bath 1 6 made of liquid tin.
- the glass melt 1 2 flows over the overflow stone 1 3 into the float bath onto the liquid tin and forms a continuous glass ribbon 1 8, which is pulled out of the float bath via pull-out rollers, not shown.
- the transition area between the overflow stone 1 3 and the float bath is covered by a cover 1 7.
- a locking slide 20 or 30 can be indirectly heated and thus brought to a defined temperature on the outer surface of the base body 21 .1.
- the base body 21 .1 is composed of refractory elements and then forms a pocket-shaped, hollow blocking slide 20, into which a radiant heating element 22.1 is inserted.
- the inner surface of the gate valve is not touched by the radiant heating element 22.1 and is heated by radiant heat.
- the heat passes through the base body 21 .1, so that its outer surface assumes a defined temperature profile and the conditions are thus created so that temperature changes on the gate valve do not impair the surface quality of the floated glass band.
- the gate valve 20 which, for reasons of cost, preferably consists of slip-cast and sintered silica glass ceramic (fused silica), can be provided with a noble metal coating extends over the maximum immersion depth of the blocking slide 20 in the glass melt 1 2 in the feeder channel 1 1 and reduces the wetting of this surface area of the blocking slide 20 with glass melt 1 2.
- a noble metal coating extends over the maximum immersion depth of the blocking slide 20 in the glass melt 1 2 in the feeder channel 1 1 and reduces the wetting of this surface area of the blocking slide 20 with glass melt 1 2.
- the temperature profile on the outer surface of the gate valve 20 according to FIG. 2 is due to the construction of the base body 21 .1, the choice of refractory materials for the base body 21 .1, and the thickness of the elements of the base body 21 .1 and can be influenced by the heating power of the radiant heating element 22.1.
- the noble metal coating of the gate valve 20 also has an influence on the temperature profile of the gate valve 20.
- the base body 21 .1 can also be cast in one piece.
- the base body can consist of a solid block, into which bores of different lengths may be made, in which heating elements, e.g. Contact or radiant heating elements are arranged.
- the heating elements can also be cast in during the manufacture of the base body.
- FIG. 3 shows a directly heated gate valve 20 which has an essentially cuboid base body 21 .2 made of slip-cast and sintered silica glass ceramic (fused silica).
- This locking slide 20 extends again across the entire width of the feeder channel 11 and is vertically adjusted via the suspension device 25 (FIG. 1).
- the suspension device 25 FIG. 1
- a U-shaped, electrical heating element 22.2 is applied.
- the side legs 22.3 and 22.5 of the heating element 22.2 are applied to the narrow side walls of the base body 21 .2 which are aligned parallel to the glass melt flow and which are in the region of the upper edge on the locking slide 20 protrude and are designed as connection contacts 23 and 24 for the current feed.
- the two side legs 22.3 and 22.5 are connected to one another in the area of the lower edge of the base body 21 .2 by means of a middle leg 22.4, which is pocket-shaped and receives the convexly curved lower area of the base body 21 .2.
- This middle leg 22.4 can also serve as a coating if it extends over the maximum immersion depth of the locking slide 20.
- the thickness of the legs, the degree of coverage of the middle leg 22.4 and the current supplied can be used as influencing parameters for the temperature profile on the outer surface of the locking slide 20, the middle leg 22.4 of the heating element 22.2 being used as a coating and the wetting of the locking slide 20 with melted glass 1 2 and thus improves the surface quality of the floated glass ribbon.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Glass Compositions (AREA)
- Resistance Heating (AREA)
- Sliding Valves (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10390814T DE10390814B4 (de) | 2002-03-06 | 2003-03-06 | Vorrichtung zum Dosieren einer Glasschmelze in einem Speiserkanal einer Floatanlage zur Herstellung eines gefloateten Glasbandes |
JP2003572911A JP4478460B2 (ja) | 2002-03-06 | 2003-03-06 | フロートガラスリボンの製造設備の供給通路内でガラス溶融物を調量する装置 |
KR10-2004-7013688A KR20040108654A (ko) | 2002-03-06 | 2003-03-06 | 부동 유리 스트립을 제조하기 위한 부동 시스템의 공급채널 내로 유리 용융물을 도우징하기 위한 장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10209743.7 | 2002-03-06 | ||
DE10209743A DE10209743A1 (de) | 2002-03-06 | 2002-03-06 | Vorrichtung zum Einstellen des Pegelstandes einer Glasschmelze in einem Speiserkanal einer Floatanlage zur Herstellung eines gefloateten Glasbandes |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003074436A1 true WO2003074436A1 (de) | 2003-09-12 |
Family
ID=27771011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/002278 WO2003074436A1 (de) | 2002-03-06 | 2003-03-06 | Vorrichtung zum dosieren einer glasschmelze in einem speiserkanal einer floatanlage zur herstellung eines gefloateten glasbandes |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP4478460B2 (de) |
KR (1) | KR20040108654A (de) |
DE (2) | DE10209743A1 (de) |
TW (1) | TWI270538B (de) |
WO (1) | WO2003074436A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006114360A1 (de) * | 2005-04-26 | 2006-11-02 | Boettger Diether | Vorrichtung zum überführen von glasschmelze auf ein floatbad |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011136148A1 (ja) | 2010-04-28 | 2011-11-03 | 旭硝子株式会社 | 溶融ガラス供給装置 |
CN102329064B (zh) * | 2011-10-24 | 2013-09-04 | 成都光明光电股份有限公司 | 玻璃流量的控制装置及延长其使用寿命的方法 |
CN104016572A (zh) * | 2014-06-30 | 2014-09-03 | 成都光明光电股份有限公司 | 浮法玻璃的制造方法及装置 |
KR102542098B1 (ko) * | 2019-03-26 | 2023-06-13 | 주식회사 엘지화학 | 유리 제조 장치 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3576612A (en) * | 1967-02-09 | 1971-04-27 | Boussois Souchon Neuvesel Sa | Apparatus for the manufacture of float glass with a heated tweel |
-
2002
- 2002-03-06 DE DE10209743A patent/DE10209743A1/de not_active Withdrawn
-
2003
- 2003-03-05 TW TW092104692A patent/TWI270538B/zh not_active IP Right Cessation
- 2003-03-06 KR KR10-2004-7013688A patent/KR20040108654A/ko not_active Application Discontinuation
- 2003-03-06 DE DE10390814T patent/DE10390814B4/de not_active Expired - Fee Related
- 2003-03-06 WO PCT/EP2003/002278 patent/WO2003074436A1/de active Application Filing
- 2003-03-06 JP JP2003572911A patent/JP4478460B2/ja not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3576612A (en) * | 1967-02-09 | 1971-04-27 | Boussois Souchon Neuvesel Sa | Apparatus for the manufacture of float glass with a heated tweel |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006114360A1 (de) * | 2005-04-26 | 2006-11-02 | Boettger Diether | Vorrichtung zum überführen von glasschmelze auf ein floatbad |
Also Published As
Publication number | Publication date |
---|---|
TWI270538B (en) | 2007-01-11 |
JP4478460B2 (ja) | 2010-06-09 |
DE10209743A1 (de) | 2003-12-11 |
DE10390814B4 (de) | 2006-07-27 |
TW200304433A (en) | 2003-10-01 |
KR20040108654A (ko) | 2004-12-24 |
JP2005527451A (ja) | 2005-09-15 |
DE10390814D2 (de) | 2005-04-07 |
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