WO1998003439A1 - A method for adjusting and directing heat effects in a glass tempering oven and an oven - Google Patents
A method for adjusting and directing heat effects in a glass tempering oven and an oven Download PDFInfo
- Publication number
- WO1998003439A1 WO1998003439A1 PCT/FI1996/000417 FI9600417W WO9803439A1 WO 1998003439 A1 WO1998003439 A1 WO 1998003439A1 FI 9600417 W FI9600417 W FI 9600417W WO 9803439 A1 WO9803439 A1 WO 9803439A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- furnace
- glass sheet
- air
- glass
- rollers
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
- C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
- C03B29/06—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with horizontal displacement of the products
- C03B29/08—Glass sheets
Definitions
- the invention relates to a method for heating glass in a tempering furnace and to a tempering furnace, where a glass sheet is conveyed through the furnace on horizontal rollers, the glass sheet heated in the furnace by means of heating elements on both sides of the glass sheet and the glass sheet moved out from the furnace at tempering temperature.
- Previously known from publication print FI-62043 is a glass tempering method and furnace as per the introduction chapter of patent claim 1.
- the aim is to intensify heat transference onto the glass sheet upper surface by blasting air on the glass sheet upper side in the early stage of the heating cycle in order to make the upper surface heating to correspond to the effect of heat conducted from the carrying rollers to the glass sheet lower surface.
- To the top of the glass sheet preheated air is blasted from the furnace outside.
- Prior known from the Finnish publication print 80872 is a glass heating and bending furnace, where from the furnace outside air is taken into the furnace and blasted out over perforated tubes. Blasting is possible on both sides of the glass sheet. At this stage the arching of glass is not an avoidable issue, since one wants the glass sheet to bend. The blasting can be adjusted, however, moving the tubes locally. Yet, in the solution as per FI-80872 the carrying rollers are not cooled by circulation air and, as to timing, no cooling takes place in the final or in the early stage of the heating cycle in order to avoid the glass sheet from arching. No circulation air is blasted to the glass top side but air is brought in from the outside.
- the glass arching problem is solved when a glass sheet enters the furnace, becomes heated in the early stage of the cycle, and the thermal effect of the hot rollers on the cold glass sheet brought into the furnace is lessened.
- Hot air in the furnace upper part is circulated in the final stage of the heating cycle, whereby hot air, even very close to the furnace ceiling, can be put into motion and to convect heat to the glass sheet.
- Forced heat transfer in the final stage of the heating cycle in the furnace upper part equalizes differences of temperature and improves heat transfer from the heating elements, whereby their surface temperature drops, stress becomes smaller and working life grows.
- Arranging several blasters of circulation air in the furnace upper part makes it possible to heat many glass sheets, even of different size, at a time, when with the adjustable blasters convection heat is focused on necessary spots.
- the circulation air blasting can be general intern convection of the furnace or concentrated by means of channels especially on the carrying rollers.
- the rollers are cooled by blasting.
- the temperature of the rollers is, due to the radiation heat from the heating elements under them, higher than the air temperature, whereby the temperature of the rollers can be reduced also only by blasting circulation air.
- Fig. 1 shows a cross-section of the tempering furnace.
- Fig. 2 shows a cross-section of another furnace embodiment.
- Figure 1 is a one-chamber glass tempering furnace, where glass sheet 1 is heated into tempering temperature.
- the glass sheet is conveyed to and out of the furnace along a track formed of the cooling rollers 4.
- rollers 4 By means of rollers 4 also oscillation i.e. the continuous to-and-fro linear motion of the glass sheet takes place .
- heating elements 2 arranged as several fields and, correspondingly, in the lower part elements 3.
- blaster 5 channelling 6 and nozzles 7 located at rollers 4.
- blaster 5 is switched on for cooling the rollers, which due to their better radiation absorbtion are hotter than glass 1 and also because the rollers are closer to the lower surface radiation sources 3 than the glass sheet.
- Blasting does not, however, cool glass sheet 1 but may even heat it more, while, in addition to conduction, the rollers transfer heat even by air to the glass sheet. Blasting continues uninterruptedly when the glass sheet is being moved out and a new glass sheet enters as replacement and starts to warm up.
- heating elements 2 are at a distance from one another allowing air circulation between them.
- blasters 8 With the disposition and adjustment of blasters 8 the circumstances in the furnace section can be made different by adjustment, whereat it is possible to heat in the furnace to tempering temperature different kinds of glass sheets side by side or one after another at the same time. Adjustment of the blasters is done by means of a control unit into which the operation times and speeds of rotation of each single unit, for instance, are stored separately.
- blasters 9 are axial blasters located on both sides of the furnace viewed from the glass sheet 1 direction of travel.
- the upper part blasters are switched off and the lower part air circulation switched on as well as heating elements 2.
- the lower part heating elements are switched on, and approximately by then also blasting of circulation air in the lower part is switched off. From the lower part heating elements heat is transferred slightly better to the glass sheet than from the upper part elements and so the lower part elements can be switched off for some time during the process, and likewise is intensification of upper part heat convection by the blasters advantageous just in the final stage of the heating cycle in order to heat the glass sheet almost by a similar effect from its both sides.
- the sheet lower surface warms up better than the upper surface, since natural convection from the lower elements on the glass sheet is greater than from the upper elements on the glass sheet, if there is any of it directly from them at all. Transfer of radiation heat is, in its turn, of same rate on both glass sheet sides both from elements 2 and 3 per unit area.
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)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI950220A FI97378C (en) | 1995-01-19 | 1995-01-19 | Method for adjusting and targeting thermal effects in a glass tempering furnace and tempering furnace |
EP96923999A EP0932585A1 (en) | 1996-07-18 | 1996-07-18 | A method for adjusting and directing heat effects in a glass tempering oven and an oven |
AU64602/96A AU6460296A (en) | 1996-07-18 | 1996-07-18 | A method for adjusting and directing heat effects in a glass tempering oven and an oven |
PCT/FI1996/000417 WO1998003439A1 (en) | 1995-01-19 | 1996-07-18 | A method for adjusting and directing heat effects in a glass tempering oven and an oven |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI950220A FI97378C (en) | 1995-01-19 | 1995-01-19 | Method for adjusting and targeting thermal effects in a glass tempering furnace and tempering furnace |
PCT/FI1996/000417 WO1998003439A1 (en) | 1995-01-19 | 1996-07-18 | A method for adjusting and directing heat effects in a glass tempering oven and an oven |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998003439A1 true WO1998003439A1 (en) | 1998-01-29 |
Family
ID=26159880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI1996/000417 WO1998003439A1 (en) | 1995-01-19 | 1996-07-18 | A method for adjusting and directing heat effects in a glass tempering oven and an oven |
Country Status (2)
Country | Link |
---|---|
FI (1) | FI97378C (en) |
WO (1) | WO1998003439A1 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998057899A1 (en) * | 1997-06-19 | 1998-12-23 | Libbey-Owens-Ford Co. | Glass sheet heating furnace |
WO1999002458A1 (en) * | 1997-07-05 | 1999-01-21 | Saint-Gobain Vitrage | Roller-hearth kiln for heating glazing sheets |
US6172336B1 (en) | 1996-05-22 | 2001-01-09 | Uniglass Engineering Oy | Heating glass in tempering furnace |
US6282923B1 (en) | 1996-05-22 | 2001-09-04 | Uniglass Engineering Oy | Heating glass sheets in tempering furnace |
EP1184346A2 (en) * | 2000-08-28 | 2002-03-06 | Tamglass Ltd. Oy | Method for heating low-E glass panels in a tempering furnace |
GB2369355A (en) * | 2000-11-28 | 2002-05-29 | Efco Ltd | Hot-air circulating means for uniform heating of glass sheet |
DE102008025798A1 (en) | 2008-05-29 | 2009-12-03 | Zhongshan Fushan Glass Machinery Co., Ltd., Zhongshan | Rolling oven for treating glass web, comprises roller web having rollers that are arranged diagonally to the moving direction of the web parallel to each other in rotatable manner, and nozzles for blowing up of gases on the top of the web |
CN102643016A (en) * | 2012-04-28 | 2012-08-22 | 佛山市索奥斯玻璃技术有限公司 | Glass tempering furnace with intelligently controlled heating system |
CN102690048A (en) * | 2011-03-25 | 2012-09-26 | 洛阳北方玻璃技术股份有限公司 | Heating method of heating furnace for glass tempering |
CN102690047A (en) * | 2011-03-25 | 2012-09-26 | 洛阳北方玻璃技术股份有限公司 | Heating furnace for glass tempering |
CN102898008A (en) * | 2011-07-25 | 2013-01-30 | 克拉格斯工程公司 | Kiln for annealing glass slabs |
CN103964680A (en) * | 2014-05-07 | 2014-08-06 | 安徽省实防新型玻璃科技有限公司 | Toughening treatment method of 5-mm safe artistic engraved glass |
CN110937788A (en) * | 2019-12-09 | 2020-03-31 | 安徽艺云玻璃有限公司 | Hot air internal circulation type glass energy-saving furnace |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992012099A1 (en) * | 1990-12-27 | 1992-07-23 | Tamglass Oy | Method and apparatus for equalizing the temperature profile of glass sheets in a roller-equipped furnace included in a horizontal tempering plant |
-
1995
- 1995-01-19 FI FI950220A patent/FI97378C/en active
-
1996
- 1996-07-18 WO PCT/FI1996/000417 patent/WO1998003439A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992012099A1 (en) * | 1990-12-27 | 1992-07-23 | Tamglass Oy | Method and apparatus for equalizing the temperature profile of glass sheets in a roller-equipped furnace included in a horizontal tempering plant |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6172336B1 (en) | 1996-05-22 | 2001-01-09 | Uniglass Engineering Oy | Heating glass in tempering furnace |
US6282923B1 (en) | 1996-05-22 | 2001-09-04 | Uniglass Engineering Oy | Heating glass sheets in tempering furnace |
WO1998057899A1 (en) * | 1997-06-19 | 1998-12-23 | Libbey-Owens-Ford Co. | Glass sheet heating furnace |
WO1999002458A1 (en) * | 1997-07-05 | 1999-01-21 | Saint-Gobain Vitrage | Roller-hearth kiln for heating glazing sheets |
US6363752B1 (en) * | 1997-07-05 | 2002-04-02 | Saint-Gobain Glass France | Roller-hearth kiln for heating glazing sheets |
EP1184346A2 (en) * | 2000-08-28 | 2002-03-06 | Tamglass Ltd. Oy | Method for heating low-E glass panels in a tempering furnace |
EP1184346A3 (en) * | 2000-08-28 | 2003-12-03 | Tamglass Ltd. Oy | Method for heating low-E glass panels in a tempering furnace |
GB2369355A (en) * | 2000-11-28 | 2002-05-29 | Efco Ltd | Hot-air circulating means for uniform heating of glass sheet |
DE102008025798A1 (en) | 2008-05-29 | 2009-12-03 | Zhongshan Fushan Glass Machinery Co., Ltd., Zhongshan | Rolling oven for treating glass web, comprises roller web having rollers that are arranged diagonally to the moving direction of the web parallel to each other in rotatable manner, and nozzles for blowing up of gases on the top of the web |
DE102008025798B4 (en) * | 2008-05-29 | 2011-08-25 | Guangdong Fushan Glass Machinery Co., Ltd., Guangdong | Method for operating a roller kiln |
DE102008025798C5 (en) * | 2008-05-29 | 2015-08-06 | Guangdong Fushan Glass Machinery Co., Ltd. | Method for operating a roller kiln |
CN102690048A (en) * | 2011-03-25 | 2012-09-26 | 洛阳北方玻璃技术股份有限公司 | Heating method of heating furnace for glass tempering |
CN102690047A (en) * | 2011-03-25 | 2012-09-26 | 洛阳北方玻璃技术股份有限公司 | Heating furnace for glass tempering |
CN102898008A (en) * | 2011-07-25 | 2013-01-30 | 克拉格斯工程公司 | Kiln for annealing glass slabs |
EP2551247A1 (en) * | 2011-07-25 | 2013-01-30 | Keraglass Engineering S.R.L. | A kiln for annealing glass slabs |
US9499429B2 (en) | 2011-07-25 | 2016-11-22 | Keraglass Industries S.R.L. | Kiln for annealing glass slabs |
CN102643016A (en) * | 2012-04-28 | 2012-08-22 | 佛山市索奥斯玻璃技术有限公司 | Glass tempering furnace with intelligently controlled heating system |
CN103964680A (en) * | 2014-05-07 | 2014-08-06 | 安徽省实防新型玻璃科技有限公司 | Toughening treatment method of 5-mm safe artistic engraved glass |
CN110937788A (en) * | 2019-12-09 | 2020-03-31 | 安徽艺云玻璃有限公司 | Hot air internal circulation type glass energy-saving furnace |
CN110937788B (en) * | 2019-12-09 | 2022-04-15 | 安徽艺云玻璃有限公司 | Hot air internal circulation type glass energy-saving furnace |
Also Published As
Publication number | Publication date |
---|---|
FI97378C (en) | 1996-12-10 |
FI950220A0 (en) | 1995-01-19 |
FI97378B (en) | 1996-08-30 |
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