WO1998039261A1 - Procede et dispositif pour commander le bombage d'un verre dans un four de bombage du verre - Google Patents

Procede et dispositif pour commander le bombage d'un verre dans un four de bombage du verre Download PDF

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Publication number
WO1998039261A1
WO1998039261A1 PCT/FI1997/000141 FI9700141W WO9839261A1 WO 1998039261 A1 WO1998039261 A1 WO 1998039261A1 FI 9700141 W FI9700141 W FI 9700141W WO 9839261 A1 WO9839261 A1 WO 9839261A1
Authority
WO
WIPO (PCT)
Prior art keywords
bending
glass sheet
box
glass
furnace
Prior art date
Application number
PCT/FI1997/000141
Other languages
English (en)
Inventor
Kari VÄHÄ-ANTILA
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
Application filed by Glassrobots Oy filed Critical Glassrobots Oy
Priority to PCT/FI1997/000141 priority Critical patent/WO1998039261A1/fr
Priority to AU20969/97A priority patent/AU725900B2/en
Priority to EP97906197A priority patent/EP0970023A1/fr
Publication of WO1998039261A1 publication Critical patent/WO1998039261A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/025—Re-forming glass sheets by bending by gravity
    • C03B23/027—Re-forming glass sheets by bending by gravity with moulds having at least two upward pivotable mould sections

Definitions

  • the invention relates to a method and apparatus , by means of which bending produced by the force of gravity in a glass sheet bending furnace is controlled by restricting the increase of temperature on a required area in the glass sheet.
  • the problem has been that due to gravity the glass sheet bends too much, generally in the centre of the sheet before the glass sheet edge areas have even reached the required degree of bending. That is the case especially on bending big size glass sheets with an edge mould.
  • That kind of glass sheets are typically bent in a one-chamber or multi-chamber furnace, where heating is carried out with radiation elements above the glass sheet.
  • the problem is reduced in connecting radiation elements above the area of strongest bending only.
  • the object of this invention is to produce a small-mass cooling surface, which is at least in the bending section and in connection with the bending glass sheet causing differences of temperature into the glass.
  • a box type horizontal surface made for instance of two metal sheets and placed under the glass sheet, does not hinder the glass sheet from getting heated.
  • the surface can be set in function advantageously only by blasting compressed air at a certain time. When fed air is steered into and out of the box type construction, it does not cause any interference of flow in the furnace. By means of the temperature and quantity of compressed air the surface temperature can be adjusted and thus the effect on the glass sheet. Cooling by the box is used only at the final stage of heating, when harmful bending would begin, at a temperature over 550°C. Thus real heating phase can be done quickly.
  • the most advantageous embodiment is a box underneath the glass sheet, whereat much surface is achieved with as little mass as possible.
  • a box can be fixed in the edge mould, the edge mould chassis or the bending section of the furnace. It can be also built in the bending section of a series furnace, into which the edge moulds move, for instance, in turns along a track and whereby mould and glass sheet can stop at it and move across it.
  • Fig. 1 is a side view of a glass sheet in an edge mould.
  • Fig. 2 is a diagonal view of a bent glass sheet in an edge mould in the furnace.
  • Figure 1 shows a hinged edge mould on which glass sheet l is installed. Holders 4 of the mould edges are by means of joints 5 hinged to be turning in a way known as such. Due to weights 6 the glass sheet rests at first on several points till the glass sheet bending and proper design of the weights 6 finally turn holders 4 up to their overrunning stops, whereat the edges of the glass sheet middle portion sink onto the mould holders 8.
  • a box according to the invention is placed in the mould so that it is under the glass sheet about in the glass sheet middle portion.
  • Figure 2 is a diagonal representation of the mould in a 1- chamber furnace, which is a typical bending furnace of large windshields.
  • the glass has got bent to its final shape according to the edge mould.
  • both glass sheet edges there is a small bending radius due to which heat must have been directed at the most to these glass edge portions, so that bending has been possible by the force of gravity.
  • the glass sheet gets heated excessively also in its middle portion which is still without support.
  • a cooled box 3 as per this invention excessive bending of the glass sheet from its middle portion has been prevented in keeping the glass temperature lower. Then the glass sheet stiffness in its middle portion has been retained and there has been no excessive sagging. Cooling compressed air has been conveyed into box 3 when the temperature of glass middle portion has exceeded 550°C.
  • connection 7 For conveyance of compressed air there are connections 7 in the box.
  • the compressed air is steered off the box along a tube to the outside of the furnace in order to avoid disturbing flows in the furnace.
  • the box causes a cooling effect and heat radiation that is shifted over from the glass to the box and, to a low degree, as convection between these two.
  • the distance of box 3 can be adjusted with respect to the glass sheet, whereat a certain adjustment of capacity is achieved. It is also possible to adjust the compressed air quantity or the temperature and achieve different cooling effects on the glass. If necessary, with the shape and size of the box different cooling effects are produced, likewise in using several boxes disposed in required spots, if necessary.
  • a box as per the invention can be used in a series furnace. It can be installed firmly into the bending section, whereat the mould and glass sheet get along a track to its upper side or, transferably, into the bending section, whereat it is moved, when needed, to the glass lower side by a mechanism.
  • a box as per the invention can also be fixed to an edge mould moving along the track in a series furnace, where in the bending section compressed air is connected to it. It can also be in the mould chassis and from there be adjusted into different levels.
  • a plate can be used with a heat conductive coil underneath, through which the compressed air passes.

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

Procédé et dispositif permettant de commander le bombage d'une plaque de verre dans un four de bombage du verre. La plaque de verre (1) est supportée par un moule de bord (4, 8) et le bombage se fait principalement sous l'action de la pesanteur. On influence la distribution de la température du verre (1) en soufflant de l'air dans une petite boîte (3) sensiblement plane placée à côté du verre, de façon à refroidir la plaque, et par convection au moins au niveau de ladite boîte.
PCT/FI1997/000141 1997-03-04 1997-03-04 Procede et dispositif pour commander le bombage d'un verre dans un four de bombage du verre WO1998039261A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/FI1997/000141 WO1998039261A1 (fr) 1997-03-04 1997-03-04 Procede et dispositif pour commander le bombage d'un verre dans un four de bombage du verre
AU20969/97A AU725900B2 (en) 1997-03-04 1997-03-04 Method and apparatus for controlling bending of a glass in a glass bending oven
EP97906197A EP0970023A1 (fr) 1997-03-04 1997-03-04 Procede et dispositif pour commander le bombage d'un verre dans un four de bombage du verre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1997/000141 WO1998039261A1 (fr) 1997-03-04 1997-03-04 Procede et dispositif pour commander le bombage d'un verre dans un four de bombage du verre

Publications (1)

Publication Number Publication Date
WO1998039261A1 true WO1998039261A1 (fr) 1998-09-11

Family

ID=8556677

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000141 WO1998039261A1 (fr) 1997-03-04 1997-03-04 Procede et dispositif pour commander le bombage d'un verre dans un four de bombage du verre

Country Status (3)

Country Link
EP (1) EP0970023A1 (fr)
AU (1) AU725900B2 (fr)
WO (1) WO1998039261A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257972B3 (de) * 2002-12-12 2004-06-17 Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg Verfahren und Vorrichtung zum Erzeugen von Kantendruckspannungen in Glasscheiben
CN1309669C (zh) * 2001-02-06 2007-04-11 法国圣戈班玻璃厂 用于弯曲成对窗玻璃的方法和装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB821180A (en) * 1956-06-28 1959-09-30 Pittsburgh Plate Glass Co Glass bending lehr
US2984943A (en) * 1956-02-29 1961-05-23 Libbey Owens Ford Glass Co Method of heating and bending glass sheets

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2984943A (en) * 1956-02-29 1961-05-23 Libbey Owens Ford Glass Co Method of heating and bending glass sheets
GB821180A (en) * 1956-06-28 1959-09-30 Pittsburgh Plate Glass Co Glass bending lehr

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1309669C (zh) * 2001-02-06 2007-04-11 法国圣戈班玻璃厂 用于弯曲成对窗玻璃的方法和装置
US7302813B2 (en) 2001-02-06 2007-12-04 Saint-Gobain Glass France Method and device for bending glass panes in pairs
DE10257972B3 (de) * 2002-12-12 2004-06-17 Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg Verfahren und Vorrichtung zum Erzeugen von Kantendruckspannungen in Glasscheiben

Also Published As

Publication number Publication date
AU725900B2 (en) 2000-10-26
AU2096997A (en) 1998-09-22
EP0970023A1 (fr) 2000-01-12

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