EP0000269B1 - Procédé pour la trempe thermique de plaques de verre et plaques de verre obtenues par ce procédé en particulier pour être utilisées comme fenêtre latérale ou lunette-arrière d'un véhicule à moteur - Google Patents

Procédé pour la trempe thermique de plaques de verre et plaques de verre obtenues par ce procédé en particulier pour être utilisées comme fenêtre latérale ou lunette-arrière d'un véhicule à moteur Download PDF

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Publication number
EP0000269B1
EP0000269B1 EP78300072A EP78300072A EP0000269B1 EP 0000269 B1 EP0000269 B1 EP 0000269B1 EP 78300072 A EP78300072 A EP 78300072A EP 78300072 A EP78300072 A EP 78300072A EP 0000269 B1 EP0000269 B1 EP 0000269B1
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EP
European Patent Office
Prior art keywords
glass
quenching
gas
glass sheet
sheet
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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.)
Expired
Application number
EP78300072A
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German (de)
English (en)
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EP0000269A1 (fr
Inventor
Geoffrey Greenhalgh
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.)
Pilkington Automotive Ltd
Original Assignee
Triplex Safety Glass Co
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Filing date
Publication date
Application filed by Triplex Safety Glass Co filed Critical Triplex Safety Glass Co
Publication of EP0000269A1 publication Critical patent/EP0000269A1/fr
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Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/0404—Nozzles, blow heads, blowing units or their arrangements, specially adapted for flat or bent glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/0413—Stresses, e.g. patterns, values or formulae for flat or bent glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/0417—Controlling or regulating for flat or bent glass sheets

Definitions

  • This invention relates to a method of toughening a glass sheet, and can be used to produce flat or curved sheets of thermally toughened glass to be used as motor vehicle side or rear windows.
  • the toughened glass sheets shall be fractured by localised impact at a defined position on the glass sheets, two particular positions being at the geometrical centre of the glass sheet and at a position adjacent the edge of the sheet. It is then required that areas of the fractured glass sheet should be selected where the particle count is a minimum and where the particle count is a maximum and limitations are placed on the minimum and maximum particle counts permissible in such areas.
  • the minimum particle count permissible determines the maximum size of particles resulting from fracture so as to limit the danger of laceration by larger particles subsequent to fracture of the glass sheet in an accident.
  • the maximum particle count permissible determines the minimum fineness of particles resulting from accidental fracture of the glass sheet so as to limit the danger of ingestion of fine glass particles.
  • At present motor vehicle side and rear windows are made from glass of about 4.0 mm to 6.0 mm thickness and can be uniformly toughened so as to meet official fracture requirements.
  • glass sheets of thickness 4 mm and above meet the proposed E.E.C. standard referred to below if uniformly toughened to have a central tensile stress in the range 55 MN/m 2 to 59 MN/m 2.
  • E.E.C. standard referred to below if uniformly toughened to have a central tensile stress in the range 55 MN/m 2 to 59 MN/m 2.
  • thinner glass in motor vehicles e.g. of about 3.0 mm thickness
  • glass of thickness in the range 2.5 mm to 3.5 mm being of particular interest.
  • the proposed E.E.C. standard also has the requirement that the fractured glass shall not contain any elongated particles with jagged ends of more than 6 cm in length, such particles being referred to as "splines".
  • British Standard No. BS 5282 entitled "ROAD VEHICLE SAFETY GLASS" is less restrictive that the proposed E.E.C. standard in that it specifies for glass less than 4 mm in thickness a minimum particle count of 40 in a 5 cm x 5 cm square may be permitted and the maximum permitted particle count in a 5 cm x 5 cm square may be 400.
  • the British Standard also basically prohibits the presence of splines of more than 6 cm in length in the fractured test glass. The British Standard also requires that no splines are to be present in the fractured glass sheet..
  • quenching was effected by directing quenching jets at the glass sheet, and imparting a vertical oscillation or a circular oscillation to the quenching jets to produce the required distribution of regions of the glass sheet quenched at a maximum rate.
  • the quenching could also be effected by directing stationary quenching jets at the glass sheet to produce the required distribution of regions of the glass sheet quenched at a maximum rate.
  • a method of toughening a glass sheet in which the glass sheet is advanced through a quenching station where the sheet is subjected to quenching gas flow characterised in that the quenching gas flow is at least one localised gas flow which is pulsed at a repetition frequency related to the speed of advance of the glass through the quenching station to induce in the glass a distribution of regions of more highly toughened glass interspersed with regions of lesser toughened glass.
  • the glass sheet is advanced between flows of quenching gas at the quenching station to produce overall toughening of the glass, and said at least one localised gas flow is superimposed on said flows of quenching gas.
  • the invention may be applied to a glass sheet which is being advanced horizontally either on a roller conveyor or on a gaseous support. From this aspect the invention provided a method characterised in that the glass sheet which is advancing horizontally between said flows of quenching gas is subjected to a plurality of said localised gas flows by directing towards at least one face of the glass, as it passes through the quenching station, gas jets which are spaced apart in a row transversely to the direction of advance of the glass, and pulsing said gas flows to produce said distribution of regions of more highly toughened glass interspersed with regions of lesser toughened glass in which distribution there are areas in which the principal stresses acting in the plane of the glass sheet are unequal.
  • the advancing glass is subjected to an array of gas jets which are spaced apart in rows transversely of the direction of advance of the glass with the rows spaced apart in the direction of advance, and the gas jets are pulsed at a rate related to the speed of advance of the glass so that localised areas of the glass are subjected to accumulative chilling by successive pulsed jets.
  • the sheet of glass is advanced horizontally on a gaseous support through the quenching station, and said at least one gas jet is directed towards the upper face of the sheet at the quenching station.
  • the sheet of glass is advanced horizontally on rollers through the quenching station, and said at least one gas jet is directed towards at least one face of the sheet at the quenching station.
  • the invention also comprehends a toughened glass sheet for use as a side or rear window for a motor vehicle produced by the method of the invention.
  • Figure 1 illustrates the fracture pattern of a toughened glass sheet suitable for use as the side window or rear window of a motor vehicle produced by the method of the invention.
  • the glass sheet has a distribution, in rectangular array, of localised areas 1 of more highly toughened glass in the glass sheet interspersed with areas 2 of lesser toughened glass. Areas 3 of the glass have a medium toughening stress and in each of the areas 3 the principal stresses are unequal with the major principal stress acting in the direction indicated by the arrows 4.
  • Areas 5 of the glass also have a medium toughening stress and have unequal principal stresses with the major principal stress acting in the direction indicated by the arrows 6.
  • the major principal stress 6 in each area 5 acts in a direction substantially perpendicular to the direction of the major principal stress 4 in each of the areas 3.
  • the medium toughening stresses produced in the areas 3 and 5 of the glass sheet are a combination of the normal toughening stresses of equal magnitude in all directions in the plane of the glass sheet, and additional area stresses produced in the areas 3 and 5 due to the different rates at which the adjacent areas 1 and 2 are cooled and contract. These area stresses are not of equal magnitude in all directions in the plane of the glass sheet.
  • the central tensile stress in the areas 3 and 5 of the glass sheet due to the combined effect of the normal toughening stresses and the area stresses can be resolved into unequal principal stresses in the plane of the glass sheet namely a major principal tensile stress and a minor principal tensile stress acting at right angles to the major principal tensile stress.
  • the major principal tensile stress 6 acts in a direction perpendicular to the direction of the major principal tensile stress 4 in the areas 3.
  • the size of the particles produced in a fractured glass sheet depends on the degree of toughening of the glass and in general the fineness of the particles increases with the degree of toughening. Hence the particles of relatively small size are produced in the more highly toughened areas 1, in the lesser toughened areas 2 larger particles are produced, and in the areas 3 and 5 having a medium toughening stress particles of medium size are produced. This distribution of small, larger and medium sized particles is produced over the whole surface of the fractured glass sheet, and there are no splines in the fracture.
  • the requirements of the proposed E.E.C. standard and of British Standard No. BS 5282 with regard to minimum and maximum particle sizes are met when the glass is toughened to the degree described in German Offlengungsschrift No. 2709105, referred to above.
  • the glass sheet having such a stress distribution is produced according to the invention by subjecting at least one face of the glass sheet to pulsed localised gas flows for a predetermined time during its advance between quenching gas flows of a more generalised nature such as are used in the conventional toughening of a glass sheet.
  • the effect of a localised gas flows is to induce in the toughened glass the rectangular distribution of regions of more highly toughened glass interspersed with regions of lesser toughened glass just described with reference to Figure 1.
  • Apparatus as shown in Figure 2 may be employed for transporting glass sheets on a gaseous support through a heating station to a quenching station.
  • Flat sheets of glass 7 which are cut to the required shape for use as a side or rear window of a vehicle are fed in sequence on to asbestos covered conveyor rollers 8 at the loading end of the apparatus.
  • the rollers 8 have collars 9 of slightly larger diameter than the major surfaces of the rollers and the glass sheets ride on the collars 9.
  • the rollers 8 are inclined at a slight angle to the horizontal, for example an angle of about 5°.
  • the sheets 7 are fed in sequence by the rollers 8 through an inlet 10 into a heating furnace comprising a tunnel structure including a roof 11 and side walls 12.
  • the sheets 7 are conveyed through the first part of the heating furnace on further asbestos covered rollers 8 and are then conveyed through the remaining length of the furnace on a gaseous support generated by a base bed structure.
  • the bed structure comprises a base plate 13 which is a flat plate of heat-resistant stainless steel and which forms the roof of an exhaust chamber indicated at 14.
  • the plate 13 is uniformly apertured for the passage of hot gases from outlet apertures 15, Figure 3.
  • Each of the apertures 15 for the passage of hot gases upwardly through the base plate 13 is defined by the bore of a supply tube 16 which is fitted into a hole in the base plate.
  • the tops of the tubes 16 are flush with the top surface of the base plate 13 and the tubes 16 extend downwardly from the base plate 13 and are located at their lower ends in holes in a floor 17 of the exhaust chamber 14. Hot gases are supplied through ducts 18, Figure 1 to plenum chambers 19.
  • the floor 17 of the exhaust chamber 14 forms the roof of one of the plenum chambers 19.
  • the base plate 13 is also formed with equally interspersed exhaust openings 20 communicating with the exhaust chamber 14. Outlet apertures, not shown, in the walls of the exhaust chamber 14 allow gases to escape either to atmosphere or for collection and recirculation.
  • the upper face of the base plate 13 is an accurately flat surface formed to receive in intimate engagement the lower face of a series of removable blocks 21 which are machined from heat-resistant stainless steel with their lower faces machined flat so that they can be slid into the apparatus from one side into gas- tight engagement with the upper surface of the base plate 13.
  • the blocks 21 each have gas escape apertures 22 communicating with the outlet apertures 15 and gas exhaust apertures 23 communicating with the exhaust openings 20. Hot gases supplied through the ducts 18 into the plenum chamber 19 proceed upwardly through the tubes 16 and the apertures 22 in the block 21 and escape and expand above the upper surface of the block 21 to create a gaseous support under the advancing glass sheets 7.
  • Gas is continually released from the apertures 22 into the gaseous support for each glass sheet and simultaneously gas escapes from the gaseous support through the exhaust apertures 23 into the exhaust chamber 14 and thence to the outlet apertures.
  • the upper surfaces of the blocks 21 are transversely tilted so as to lie at the same small angle to the horizontal, for example 5°, as the conveyor rollers 8.
  • the upper surfaces of the collars 9 on the conveyor rollers 8 are slightly higher than the level of the upper surface of the first block 21 so that as soon as each glass sheet 7 becomes completely and uniformly supported on the gaseous support it tends to slide down the transverse incline until it is in engagement with rotating discs 24 mounted alongside the blocks 21 on vertical spindles (not shown) which extend upwardly from drive motors (not shown) arranged outside the furnace.
  • the drive motors drive the discs at a controlled speed commensurate with the rate of advance of the glass sheets on to the gaseous support by the rollers 8.
  • the collars 9 may be arranged so that if the sheets are already touching the collars then they will be in a position to be driven by the edge discs 24 without any substantial movement of the sheets down the transversely sloping upper surface of the first block 21.
  • the glass sheets are, as shown in Figure 2, placed on the conveyor rollers end-to-end so that a succession of flat glass sheets 7 are advanced into the furnace by the driving action of the conveyor rollers.
  • the edge discs 24 maintain the registration of the glass sheets in the furnace and also provide drive to cause the forward movement of the sheets. However, some of the discs 24 may be free running and act as rotatable guides.
  • the advance of the hot glass sheets continues to a quenching station which is indicated generally at 27 in Figure 3.
  • the glass sheets are supported on a gaseous support generated above a bed of identical construction to the bed in the furnace except that the bed is supplied with chilling air at ambient temperature.
  • the presence of each glass sheet advancing into the quenching station 27 from the furnace generates a gaseous cushion between the sheet and the upper surface of the bed which provides both the required support for the sheet and a flow of chilling air against the bottom surface of the glass sheet.
  • the advance of the glass sheet is continued by means of rotating discs, not shown.
  • the quenching station there is a generalised flow of quenched gas contacting the upper surface of the glass sheet which gas flow has a substantially identical chilling effect on the upper surface of the glass as the chilling effect of the lower surface by the gaseous support.
  • the gas flows on the upper surface are generated from an upper gas supply and exhaust equipment of identical construction to the base bed supplying gas to and exhausting gas from the gaseous support.
  • the upper part of the quenching station comprises a plate 28 of asbestos-based, heat-resistant material which has gas supply apertures 29 and gas exhaust apertures 30. These apertures are also shown in Figure 4.
  • the plate 28 is fixed to an apertured base plate 31 of a gas exhaust chamber 32.
  • the matching surfaces of the plates 28 and 31 are machined flat so as to be gas tight.
  • the roof of the exhaust chamber 32 is a plate 33 which also forms the base of a plenum chamber 34 to which chilling air at ambient temperature is supplied.
  • the chilling air passes through apertures in the plate 33 and is conducted down tubes 35 extending through the exhaust chamber 32 the lower ends of which tubes are fixed in the base plate 31 of the exhaust chamber and communicate with the gas supply apertures 29 in the plate 28.
  • the gas exhaust apertures in the plate 28 are aligned with exhaust apertures 36 in the plate 31 so that gas can escape from above the glass sheet into the exhaust chamber 32 whose walls have apertures so that the exhaust gases can be exhausted to atmosphere or collected and recirculated.
  • the hot glass sheet which is being subjected to the generalised quenching gas flows at the quenching station is also subjected to localised gas flows by subjecting the upper surface of the glass to a rectangular array of gas jets which are spaced apart in rows transversely of the direction of advance of the glass with rows spaced apart in the direction of advance.
  • the distribution of the gas supply apertures 29 and gas support apertures 30 in the plate 28 is slightly inclined to the direction of advance of the glass, as illustrated in Figure 4, in order to minimise any striping effect which could otherwise be produced in the form of a polarisation pattern on the glass surface.
  • the array of gas jets is provided by an array of gas supply nozzles 37 which are connected in rows to ducts 38 located in the exhaust chamber 32.
  • the nozzles 37 extend downwardly through specially enlarged gas exhaust apertures 30 in the plate 28 as illustrated in Figures 3 and 4.
  • One end of each of the ducts is connected to an air supply manifold 39 located outside the exhaust chamber alongside the quenching station.
  • Figure 6 illustrates regulation of the air supply to the manifold 39 and therefore regulation of the gas jets.
  • the manifold 39 is connected through a pressure regulator 42 to the outlet of a solenoid operated spool valve 43 of conventional design.
  • Air is supplied from an air supply 44 through a regulator 45 to an air receiver 46 which is connected to the inlet of the spool valve 43.
  • the air supply 44 is a supply of compressed air.
  • the spool valve is controlled by an electronic timing unit 47 connected by control lines indicated at 48 to the spool valve. There are two setting controls on the timing unit 47. One of these 49 controls the frequency of opening the valve 43 to supply pulses of compressed air on the manifold 39 to the nozzles 37. The control 50 controls the length of each pulse of compressed air.
  • each hot glass sheet When each hot glass sheet is advancing through the generalised quenching which it receives by the quenching gas flows adjacent both its surfaces at the quenching station, it is also subjected to localised gas flows from the nozzles 37 for a predetermined time. These gas flows are pulsed at a pulse repetition frequency and with a pulse length related to the speed of advance of the glass through the quenching station.
  • the controls 49 and 50 of the timing unit 47 are set so that each increment of the glass sheet passes from one row of nozzles 37 to the next row of nozzles 37 in the time between pulses.
  • the localised regions of the glass which have received more intense quenching by reason of the pulsed gas jets from the first row of nozzles are beneath the second row of nozzles by the time the second pulse of compressed air is supplied to the nozzles. These localised areas are therefore subjected to accumulative chilling by the successive pulsed jets of gas.
  • This localised quenching of the upper surface of the glass superimposed on the general overall quenching which is being achieved at the quenching station produces in the glass the distribution of regions of more highly toughened glass interspersed with regions of lesser toughened glass described with reference to Figure 1 and the resultant toughened glass sheet which emerges from the quenching station on rollers 51 has the required stress pattern.
  • the pulsing of the supply of compressed air to the manifold 39 may be achieved by means of a rotary ball valve 52, Figure 7, driven from a variable speed motor drive unit 53 which is connected to the rotary ball of the valve 52 through a coupling 54.
  • the relationship between pulse repetition frequency and pulse length cannot be varied with a valve of this kind although the repetition frequency and pulse length can be varied together by variation of the speed of the motor.
  • the compressed air supply is at 690 kPa on line 44.
  • the diameter of the bore of each of the nozzles 37 is 4.8 mm and the nozzle spacing is at 38 mm square pitch.
  • the spacing of the ends of the nozzles from the upper surface of the glass supported on the gas cushion at the quenching station is 6 mm to 12 mm.
  • the frequency and duration of the pulsing of the compressed air supply depends on the length of the glass sheet and its speed. With a speed of travel of the glass of 190 mm/s there is one pulse every 0.2 seconds and a duration of each pulse is 0.1 seconds.
  • the product had an average central tensile stress of between 55 MN/m 2 to 62 MN/m 2 with a principal stress difference in at least some of the areas at a maximum between 6 MN/m 2 and 15 MN/m 2 .
  • One result achieved was 8.4 MN/ M 2.
  • each glass sheet advances on to a transitional block 55 whose thickness along its longitudinal centre line is the same as the thickness of the two blocks 21 but whose upper face is machined as a series of flats of gradually increasing angle which result in the upper surface of the block 55 having the desired final curved form of the glass sheets.
  • the glass advantages on to this transitional block and is heated to a temperature such that it can sag downwardly to conform to the shape of the block.
  • the block is apertured to provide a gaseous support created beneath the hot deformable glass as it glides over the block.
  • This downward sagging increases progressively as the glass sheet advances and the glass which is still hot and deformable moves from the block 55 onto a final part of the bed 56 whose cross section conforms to the now curved shape of the glass sheet.
  • the glass sheet advances over this curved section of the bed to the quenching station the upper and lower part of which are also suitably curved with a curved distribution of the nozzles 37 in order to provide the overall quenching of the glass sheets simultaneously with the localised quenching by the gas jets from the nozzles 37.
  • Figure 9 illustrates the toughening of a glass sheet 7 which is being advanced on a roller conveyor comprising a series of horizontal rollers 57.
  • the conveyor carries the glass sheet through a heating furnace indicated at 58 at a quenching station where the rollers carry the glass sheet between upper and lower blowing boxes 58 and 59.
  • the box 58 has an array of blowing nozzles 60 which point downwardly toward the roller conveyor so as to direct generalised quenching gas flows on to the upper surface of the glass sheet 7.
  • the nozzles 60 are arranged at a slight angle to the direction of advance of the glass sheet in the same way as the supply and exhaust apertures in Figure 4.
  • the lower blowing box 59 has upwardly projecting blowing nozzles 61 which are directed through the gaps between the rollers 57 and are also arranged at a slight angle to the direction of advance of the glass sheet.
  • the flows of quenching gas from the nozzles 60 and 61 is supplemented by localised gas flows from a row of gas supply nozzles 37 connected to a duct 38 and mounted between adjacent rows of upper nozzles 60.
  • the nozzles 37 direct localised gas jets at the upper surface of the glass in the same way as described with reference to Figures 3 and 4 and are pulsed as described with reference to Figure 6 or Figure 7 so that the glass sheet emerging from the quenching station on the roller conveyor has the required distribution of regions of more highly toughened glass interspersed with regions of lesser toughened glass.
  • localised gas jets may be directed against the lower surface of the glass sheet by gas supply nozzles 37 directed upwardly through the gaps between the rollers 57.
  • gas supply nozzles 37 directed upwardly through the gaps between the rollers 57.
  • localised gas jets are directed against both the upper and lower surfaces of the glass sheets these are arranged to act on opposed regions of the two surfaces of the sheets.
  • Such a toughening pattern may not be produced over the whole of the glass sheet.
  • Part only of the sheet may be subjected to the pulsed localised gas jets by providing nozzles 37 only over the path of the part of the sheet to be specially toughened. Only one nozzle may be employed to produce in a strip-shaped region of the sheet a linear distribution of areas of more highly toughened glass interspersed with regions of lesser toughened glass.
  • the toughening produced by the pulsed localised gas jets need not be superimposed on a generalised toughening but may be employed alone when the glass sheet is advanced on a roller conveyor or while suspended vertically from an overhead conveyor or while carried in a near-vertical. position on a movable carriage. Because of the quenching action of the spill of gas over the glass surface between the gas jets impinging on the glass, there is a degree of lesser toughening of the regions of the glass which lie between the regions of more highly toughened glass produced by the pulsed gas jets. This may be affective over the whole of the sheet or over part only of the sheet with the rest of the sheet untoughened.

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

Claims (7)

1. Procédé de trempe de feuille de verre selon lequel la feuille de verre avance à travers un poste de trempe où elle est soumise à l'action d'un courant de gaz de trempe, caractérisé en ce que le courant de gaz de trempe est constitué par au moins un courant gazeux localisé qui est pulsé à une fréquence de répétition liée à la vitesse d'avance du verre à travers le poste de trempe, ceci pour établir dans le verre une distribution de régions à degré de trempe relativement accusé entremêlées avec des régions à degré de trempe moindre.
2. Procédé selon la revendication 1, selon lequel la feuille le de verre avance, au poste de trempe, entre des courants de gaz de trempe destinés à assurer une trempe d'ensemble du verre, caractérisé en ce que le ou chaque courant gazeux localisé précité est superposé aux dits courants de gaz de trempe.
3. Procédé selon la revendication 2, caractérisé en ce que, pour soumettre la feuille de verre, en cours d'avance horizontale entre lesdits courants de gaz de trempe, à l'action de plusieurs desdits courants gazeux localisés, on dirige vers une face au moins du verre pendant que celui-ci traverse le poste de trempe, des jets gazeux espacés en rangée transversalement à la direction d'avance du verre, et en ce qu'on pulse ces courants gazeux pour établir ladite distribution de régions à degrés de trempe relativement accusé et moindre, cette distribution comportant des zones où les principales contraintes agissant dans le plan de la feuille de verre sont inégales.
4. Procédé selon la revendication 3, caractérisé en ce que l'on pulse un ensemble de jets gazeux qui sont espacés en rangées transversalement à la direction d'avance du verre, les rangées étant espacées suivant la direction d'avance, la fréquence de pulsation étant liée à la vitesse d'avance du verre de façon que certaines zones localisées du verre subissent un refroidissement cumulatif sous l'action de jets pulsés successifs.
5. Procédé selon l'une quelconque des revendications 1 à 4, charactérisé en ce qu'au moins un courant gazeux localisé est dirigé vers la face supérieure de la feuille de verre, qui avance horizontalement à travers le poste de trempe sur un support gazeux.
6. Procédé selon l'une quelconque des revendications 1 à 4, charactérisé en ce que le ou chaque courant gazeux localisé précité est dirigé vers une face au moins de la feuille de verre, qui avance horizontalement à travers le poste de trempe sur des rouleaux.
7. Feuille de verre trempé à utiliser comme glace latérale ou arrière pour véhicule automobile, obtenue par un procédé selon l'une quelconque des revendications 1 à 6.
EP78300072A 1977-06-23 1978-06-23 Procédé pour la trempe thermique de plaques de verre et plaques de verre obtenues par ce procédé en particulier pour être utilisées comme fenêtre latérale ou lunette-arrière d'un véhicule à moteur Expired EP0000269B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2636277 1977-06-23
GB2636277 1977-06-23

Publications (2)

Publication Number Publication Date
EP0000269A1 EP0000269A1 (fr) 1979-01-10
EP0000269B1 true EP0000269B1 (fr) 1980-10-29

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EP78300072A Expired EP0000269B1 (fr) 1977-06-23 1978-06-23 Procédé pour la trempe thermique de plaques de verre et plaques de verre obtenues par ce procédé en particulier pour être utilisées comme fenêtre latérale ou lunette-arrière d'un véhicule à moteur

Country Status (6)

Country Link
US (1) US4182619A (fr)
EP (1) EP0000269B1 (fr)
JP (1) JPS5433517A (fr)
DE (1) DE2860253D1 (fr)
IE (1) IE47521B1 (fr)
IT (1) IT1111483B (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5515911A (en) * 1978-07-14 1980-02-04 Nippon Sheet Glass Co Ltd Glass plate cooling method
JPS58122533U (ja) * 1982-02-13 1983-08-20 高橋　清次郎 鍋蓋ができるお玉の柄
FR2525206B1 (fr) * 1982-04-16 1986-02-21 Saint Gobain Vitrage Procede pour la trempe differenciee de vitrages, notamment de pare-brise d'automobiles
CA1259090A (fr) * 1983-09-26 1989-09-05 Libbey-Owens-Ford Co. Ensemble de fenetre prefaconne, et sa fabrication
US4946491A (en) * 1988-11-21 1990-08-07 Glasstech, Inc. Method and apparatus for glass tempering
JP2653708B2 (ja) * 1990-01-31 1997-09-17 セントラル硝子株式会社 強化ガラス板の製造方法
DE69608747T2 (de) * 1995-09-07 2000-10-12 Ford Motor Co Verfahren zum Erhitzen, Formen und Härten einer Glasscheibe
EP0761613B1 (fr) * 1995-09-07 2001-10-24 Ford Motor Company Procédé de chauffage et de formage d'une feuille de verre
EP0761612B1 (fr) * 1995-09-07 2000-06-07 Ford Motor Company Procédé de chauffage d'une feuille de verre
JPH09183626A (ja) 1995-12-28 1997-07-15 Central Glass Co Ltd 薄板強化ガラス
US5939175A (en) * 1996-04-11 1999-08-17 Nippon Sheet Glass Co., Ltd. Method of finishing heat-reinforced plate glass and edge regions thereof
US6079227A (en) * 1997-06-05 2000-06-27 Nippon Sheet Glass Co., Ltd. Method for manufacturing bent and tempered glass sheet and apparatus for manufacturing the same
JP2001026434A (ja) * 1999-07-13 2001-01-30 Nippon Sheet Glass Co Ltd ガラス急冷装置
US6826929B2 (en) * 2001-09-19 2004-12-07 Premakaran T. Boaz Method for simultaneously heating and cooling glass to produce tempered glass
JP6702027B2 (ja) * 2015-07-24 2020-05-27 Ａｇｃ株式会社 強化ガラス板

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2042610A (en) * 1933-06-17 1936-06-02 Corning Glass Works Method and apparatus for tempering glass
FR774633A (fr) * 1933-09-06 1934-12-10 Procédé, appareil et installation pour le traitement thermique des métaux, du verre et autres matériaux plus particulièrement ouvrés en feuille et produits en résultant
US3293015A (en) * 1961-09-22 1966-12-20 Pittsburgh Plate Glass Co Method and apparatus for tempering glass sheets on a gas support bed
FR1567937A (fr) * 1967-11-10 1969-05-23
FR1580190A (fr) * 1968-03-26 1969-09-05
US3497340A (en) * 1968-07-29 1970-02-24 Ppg Industries Inc Method of tempering and reshaping glass sheets

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Publication number Publication date
EP0000269A1 (fr) 1979-01-10
JPS5433517A (en) 1979-03-12
IE47521B1 (en) 1984-04-18
IT1111483B (it) 1986-01-13
US4182619A (en) 1980-01-08
IT7868473A0 (it) 1978-06-22
DE2860253D1 (en) 1981-01-29
JPS6140608B2 (fr) 1986-09-10
IE781218L (en) 1978-12-23

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