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WO1998003439A1 - Procede de regulation et de ciblage des phenomenes thermiques dans un four de trempage du verre, et four correspondant - Google Patents

Procede de regulation et de ciblage des phenomenes thermiques dans un four de trempage du verre, et four correspondant Download PDF

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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
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/FI1996/000417
Other languages
English (en)
Inventor
Marko Lindroos
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.)
Glassrobots Oy
Original Assignee
Glassrobots Oy
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
Priority to FI950220A priority Critical patent/FI97378C/fi
Application filed by Glassrobots Oy filed Critical Glassrobots Oy
Priority to PCT/FI1996/000417 priority patent/WO1998003439A1/fr
Priority to EP96923999A priority patent/EP0932585A1/fr
Priority to AU64602/96A priority patent/AU6460296A/en
Publication of WO1998003439A1 publication Critical patent/WO1998003439A1/fr
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
    • 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

La présente invention concerne un procédé de régulation et de ciblage des phénomènes thermiques affectant, à l'intérieur d'un four de trempage du verre, différents éléments structurels et tout ou partie d'un volume d'air. Selon ce procédé, le verre (1) à tremper progresse sur un convoyeur à cylindres horizontaux (4) aux travers du four, le verre plat se réchauffant sous l'influence d'éléments chauffants (2, 3) disposés, les uns du côté de la face supérieure, les autres du côté de la face inférieure du verre plat. Pendant la phase finale du cycle de chauffe, la convection interne prenant naissance dans la partie basse du four provoque une diminution des phénomènes thermiques imputables aux éléments chauffants inférieurs (3) et affectant les cylindres (4) supportant le verre plat, ce qui fait que la circulation d'air dans la partie inférieure s'interrompt dès qu'une nouvelle pièce froide de verre plat atteint une température d'environ 100 °C. En outre, des soufflantes réglables assurant la circulation d'air (8) dans la partie supérieure du four permettent de réguler et d'amplifier la circulation d'air chaud et les phénomènes thermiques affectant le verre plat (1) pendant la phase finale où la température du verre dépasse 400 °C.
PCT/FI1996/000417 1995-01-19 1996-07-18 Procede de regulation et de ciblage des phenomenes thermiques dans un four de trempage du verre, et four correspondant Ceased WO1998003439A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FI950220A FI97378C (fi) 1995-01-19 1995-01-19 Menetelmä lämpövaikutusten säätämiseksi ja kohdentamiseksi lasin karkaisu-uunissa ja karkaisu-uuni
PCT/FI1996/000417 WO1998003439A1 (fr) 1995-01-19 1996-07-18 Procede de regulation et de ciblage des phenomenes thermiques dans un four de trempage du verre, et four correspondant
EP96923999A EP0932585A1 (fr) 1996-07-18 1996-07-18 Procede de regulation et de ciblage des phenomenes thermiques dans un four de trempage du verre, et four correspondant
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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI950220A FI97378C (fi) 1995-01-19 1995-01-19 Menetelmä lämpövaikutusten säätämiseksi ja kohdentamiseksi lasin karkaisu-uunissa ja karkaisu-uuni
PCT/FI1996/000417 WO1998003439A1 (fr) 1995-01-19 1996-07-18 Procede de regulation et de ciblage des phenomenes thermiques dans un four de trempage du verre, et four correspondant

Publications (1)

Publication Number Publication Date
WO1998003439A1 true WO1998003439A1 (fr) 1998-01-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000417 Ceased WO1998003439A1 (fr) 1995-01-19 1996-07-18 Procede de regulation et de ciblage des phenomenes thermiques dans un four de trempage du verre, et four correspondant

Country Status (2)

Country Link
FI (1) FI97378C (fr)
WO (1) WO1998003439A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998057899A1 (fr) * 1997-06-19 1998-12-23 Libbey-Owens-Ford Co. Four pour plaques de verre
WO1999002458A1 (fr) * 1997-07-05 1999-01-21 Saint-Gobain Vitrage Four a rouleaux pour le chauffage de vitrages
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
GB2369355A (en) * 2000-11-28 2002-05-29 Efco Ltd Hot-air circulating means for uniform heating of glass sheet
EP1184346A3 (fr) * 2000-08-28 2003-12-03 Tamglass Ltd. Oy Procédé de chauffage de panneaux en verre à basse E dans un four de trempe
DE102008025798A1 (de) 2008-05-29 2009-12-03 Zhongshan Fushan Glass Machinery Co., Ltd., Zhongshan Rollenofen zum Erhitzen von Glasbahnen
CN102643016A (zh) * 2012-04-28 2012-08-22 佛山市索奥斯玻璃技术有限公司 一种具有智能控制加热系统的玻璃钢化炉
CN102690048A (zh) * 2011-03-25 2012-09-26 洛阳北方玻璃技术股份有限公司 玻璃钢化用加热炉的加热方法
CN102690047A (zh) * 2011-03-25 2012-09-26 洛阳北方玻璃技术股份有限公司 玻璃钢化用加热炉
EP2551247A1 (fr) * 2011-07-25 2013-01-30 Keraglass Engineering S.R.L. Four de recuit de plaques de verre
CN103964680A (zh) * 2014-05-07 2014-08-06 安徽省实防新型玻璃科技有限公司 一种5mm安全艺术雕刻玻璃的钢化处理方法
CN110937788A (zh) * 2019-12-09 2020-03-31 安徽艺云玻璃有限公司 一种热风内循环式玻璃节能炉

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012099A1 (fr) * 1990-12-27 1992-07-23 Tamglass Oy Procede et appareil permettant d'egaliser le profil des temperatures de feuilles de verre dans un fourneau a rouleaux compris dans une installation de recuisson horizontale

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012099A1 (fr) * 1990-12-27 1992-07-23 Tamglass Oy Procede et appareil permettant d'egaliser le profil des temperatures de feuilles de verre dans un fourneau a rouleaux compris dans une installation de recuisson horizontale

Cited By (19)

* Cited by examiner, † Cited by third party
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 (fr) * 1997-06-19 1998-12-23 Libbey-Owens-Ford Co. Four pour plaques de verre
WO1999002458A1 (fr) * 1997-07-05 1999-01-21 Saint-Gobain Vitrage Four a rouleaux pour le chauffage de vitrages
US6363752B1 (en) * 1997-07-05 2002-04-02 Saint-Gobain Glass France Roller-hearth kiln for heating glazing sheets
EP1184346A3 (fr) * 2000-08-28 2003-12-03 Tamglass Ltd. Oy Procédé de chauffage de panneaux en verre à basse E dans un four de trempe
GB2369355A (en) * 2000-11-28 2002-05-29 Efco Ltd Hot-air circulating means for uniform heating of glass sheet
DE102008025798B4 (de) * 2008-05-29 2011-08-25 Guangdong Fushan Glass Machinery Co., Ltd., Guangdong Verfahren zum Betreiben eines Rollenofens
DE102008025798A1 (de) 2008-05-29 2009-12-03 Zhongshan Fushan Glass Machinery Co., Ltd., Zhongshan Rollenofen zum Erhitzen von Glasbahnen
DE102008025798C5 (de) * 2008-05-29 2015-08-06 Guangdong Fushan Glass Machinery Co., Ltd. Verfahren zum Betreiben eines Rollenofens
CN102690048A (zh) * 2011-03-25 2012-09-26 洛阳北方玻璃技术股份有限公司 玻璃钢化用加热炉的加热方法
CN102690047A (zh) * 2011-03-25 2012-09-26 洛阳北方玻璃技术股份有限公司 玻璃钢化用加热炉
EP2551247A1 (fr) * 2011-07-25 2013-01-30 Keraglass Engineering S.R.L. Four de recuit de plaques de verre
CN102898008A (zh) * 2011-07-25 2013-01-30 克拉格斯工程公司 玻璃板退火窑
US9499429B2 (en) 2011-07-25 2016-11-22 Keraglass Industries S.R.L. Kiln for annealing glass slabs
CN102643016A (zh) * 2012-04-28 2012-08-22 佛山市索奥斯玻璃技术有限公司 一种具有智能控制加热系统的玻璃钢化炉
CN103964680A (zh) * 2014-05-07 2014-08-06 安徽省实防新型玻璃科技有限公司 一种5mm安全艺术雕刻玻璃的钢化处理方法
CN110937788A (zh) * 2019-12-09 2020-03-31 安徽艺云玻璃有限公司 一种热风内循环式玻璃节能炉
CN110937788B (zh) * 2019-12-09 2022-04-15 安徽艺云玻璃有限公司 一种热风内循环式玻璃节能炉

Also Published As

Publication number Publication date
FI97378C (fi) 1996-12-10
FI97378B (fi) 1996-08-30
FI950220A0 (fi) 1995-01-19

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