EP0928286A1 - Soda-lime glass composition - Google Patents

Soda-lime glass composition

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Publication number
EP0928286A1
EP0928286A1 EP98935073A EP98935073A EP0928286A1 EP 0928286 A1 EP0928286 A1 EP 0928286A1 EP 98935073 A EP98935073 A EP 98935073A EP 98935073 A EP98935073 A EP 98935073A EP 0928286 A1 EP0928286 A1 EP 0928286A1
Authority
EP
European Patent Office
Prior art keywords
glass composition
glass
content
composition according
oxides
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.)
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Application number
EP98935073A
Other languages
German (de)
French (fr)
Inventor
Maurice Lemaille
David Brown-Brulant
Ramon Rodriguez Cuertas
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.)
Saint Gobain Glass France SAS
Original Assignee
Saint Gobain Vitrage SA
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 Saint Gobain Vitrage SA filed Critical Saint Gobain Vitrage SA
Publication of EP0928286A1 publication Critical patent/EP0928286A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass

Definitions

  • the invention relates to new glass compositions of the soda-lime-silica type.
  • This type of glass composition is commonly used in the "flat glass” industry, that is to say the glass industry supplying glazing for industries such as the building and automotive industries.
  • the usual glazing manufacturing techniques for these industries consist first of melting raw materials, which will make it possible to obtain the desired glass composition, then forming a glass ribbon on a bath of molten metal according to the process " float ".
  • the cost of alkaline oxides and in particular sodium oxide Na 2 O can account for 60 to 80% of the price of the composition.
  • the content of alkaline oxides in the most conventional compositions is greater than 13.5% and most often greater than 14%.
  • the alkaline oxides more particularly have the function of helping the melting of the composition and of reducing the viscosity at high temperatures. Reducing the contents of alkaline oxides while preserving conventional manufacturing conditions, in particular melting and refining conditions, without the risk of devitrification, in particular during the forming of the glass ribbon therefore seems difficult without changing the conditions for melting or working the glass.
  • the inventors have nevertheless given themselves the mission of producing new, more economical silica-soda-lime-type glass compositions can be melted and then transformed into glass ribbon, without modification of the usual installation or their conditions of use.
  • this object is achieved by a glass composition of the soda-lime-silica type intended to be transformed into flat glass according to the float process, the content of alkali oxides expressed as a percentage by weight, is between 9 and 13, 3%.
  • the content of alkaline oxides is greater than 12.50% and more preferably still greater than 13%.
  • Such alkali contents notably improve the durability of refractories.
  • the alkaline oxides present in the compositions are essentially Na 2 0 and K 2 O.
  • the oxide K 2 O is advantageously present in the form of an impurity.
  • the Na 2 O content is thus between 7 and 13.3% and preferably it is greater than 11.1% and more preferably still greater than 12.5%.
  • the sum of the contents of the CaO and MgO oxides is less than 13%. According to this variant, the sum of the contents of the CaO and MgO oxides is lower than that of the compositions usually melted for producing flat glass on float. This decrease in the content of these oxides can contribute to reducing the risk of devitrification by lowering the devitrification temperature.
  • a drop in density and therefore a reduction in surface area may interest the automobile industry which increasingly aims to reduce the weight of vehicles, in particular for those powered by electric energy.
  • log ⁇ 14.6
  • the matrix of the glass composition comprises the following constituents in the following weight proposals:
  • compositions thus defined according to the invention show, compared to the compositions usually melted and transformed into flat glass according to the float process, a drop in the Na 2 O oxide contents which leads to savings from the point of view of material costs. raw. Furthermore, the contents of alkaline earth oxides, and more particularly the CaO content, are reduced, in particular to limit the risks of devitrification and reduce the density of the glass. This last characteristic, a decrease in the density of the glass, is reinforced by the fact that the decreases in the oxide contents which have just been mentioned are compensated for by an increase in the silica content always in comparison with the compositions usually melted to form glass. flat using the float process.
  • alumina AI 2 O 3 its content can reach 1.6% due to the content of certain sands used as raw materials. This content of Al 2 O 3 is however advantageously less than 1% and more preferably still less than 0.6%. Alumina is however advantageously present with a content of at least 0.2%, in particular for its role as stabilizer.
  • the content of oxide K 2 O can reach 1.5%, this can also be provided by certain sands used as raw material.
  • the potash content is however advantageously less than 0.5% and preferably less than 0.2%.
  • the glass composition according to the invention can comprise other constituents, in particular all the constituents known to those skilled in the art for producing colored glasses.
  • composition of glass, non-colored, very particularly advantageous is such that its matrix comprises the following constituents in the following weight proposals:
  • compositions compared are the following: (the contents are expressed in percentages by weight).
  • composition A shows a fusibility of composition A little different from that of composition B.
  • T iiq is the liquidus temperature
  • composition according to the invention can have a slightly more delicate melting than that of composition B.
  • the compositions according to the invention therefore allow melting and forming of the glass according to the float process with a significantly reduced cost of raw materials. Furthermore, the density of the glass formed from these compositions is lower than that of the previous compositions, which also leads to a significant saving. In fact, if the variation in density which appears between compositions A and B does not seem significant, it should be noted that this variation intervenes directly on the cost of the finished product.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

The invention concerns a soda-lime glass composition designed to be transformed into flat glass by float glass process, said content in alkaline oxides being between 9 and 13.3 %.

Description

COMPOSITION DE VERRE DE TYPE SILICO-SODO-CALCIQUE GLASS COMPOSITION OF THE SILICO-SODO-CALCIUM TYPE
L'invention concerne de nouvelles compositions de verre de type silico- sodo-calcique. Ce type de compositions de verre est couramment utilisé dans l'industrie du "verre plat', c'est à dire l'industrie verrière fournissant des vitrages pour les industries telles que celles du bâtiment et de l'automobile.The invention relates to new glass compositions of the soda-lime-silica type. This type of glass composition is commonly used in the "flat glass" industry, that is to say the glass industry supplying glazing for industries such as the building and automotive industries.
Les techniques usuelles de fabrication de vitrages pour ces industries consistent tout d'abord à fondre des matières premières, qui permettront d'obtenir la composition de verre souhaitée, puis à former un ruban de verre sur un bain de métal en fusion selon le procédé "float".The usual glazing manufacturing techniques for these industries consist first of melting raw materials, which will make it possible to obtain the desired glass composition, then forming a glass ribbon on a bath of molten metal according to the process " float ".
La demande actuelle conduit l'industrie du verre plat à diminuer les coûts de production. Outre les dépenses énergétiques, une part importante du prix de revient du verre est lié aux matières premières.Current demand is driving the flat glass industry to lower production costs. In addition to energy expenditure, a significant part of the cost price of glass is linked to raw materials.
Tout particulièrement pour les usines situées en Europe et sur le continent Américain, le coût des oxydes alcalins et notamment l'oxyde de sodium Na2O peut compter pour 60 à 80 % du prix de la composition. La teneur en oxydes alcalins des compositions les plus classiques est supérieure à 13,5 % et le plus souvent supérieure à 14 %. Les oxydes alcalins ont plus particulièrement pour fonction d'aider à la fusion de la composition et de diminuer la viscosité aux températures élevées. Diminuer les teneurs des oxydes alcalins en conservant des conditions de fabrication, notamment de fusion et d'affinage, classiques sans risque de dévitrification notamment lors du formage du ruban de verre semble donc difficile sans changer les conditions de fusion ou de travail du verre.Especially for factories located in Europe and on the American continent, the cost of alkaline oxides and in particular sodium oxide Na 2 O can account for 60 to 80% of the price of the composition. The content of alkaline oxides in the most conventional compositions is greater than 13.5% and most often greater than 14%. The alkaline oxides more particularly have the function of helping the melting of the composition and of reducing the viscosity at high temperatures. Reducing the contents of alkaline oxides while preserving conventional manufacturing conditions, in particular melting and refining conditions, without the risk of devitrification, in particular during the forming of the glass ribbon therefore seems difficult without changing the conditions for melting or working the glass.
Les inventeurs se sont pourtant donnés pour mission la réalisation de nouvelles compositions de verre de type silico-sodo-calcique plus économiques pouvant être fondues puis transformées en ruban de verre, sans modification de l'installation usuelle ni de leurs conditions d'utilisation.The inventors have nevertheless given themselves the mission of producing new, more economical silica-soda-lime-type glass compositions can be melted and then transformed into glass ribbon, without modification of the usual installation or their conditions of use.
Ce but est atteint selon l'inventeur par une composition de verre de type silico- sodo-calcique destinée à être transformée en verre plat selon le procédé float, dont la teneur en oxydes alcalins exprimée en pourcentage pondéraux, est comprise entre 9 et 13,3 %.According to the inventor, this object is achieved by a glass composition of the soda-lime-silica type intended to be transformed into flat glass according to the float process, the content of alkali oxides expressed as a percentage by weight, is between 9 and 13, 3%.
Les inventeurs ont ainsi pu vaincre un préjugé technique qui consistait à penser qu'une baisse de la teneur en alcalins conduirait d'une part à une fusion impossible et d'autre part, conduirait à une dévitrification lors du formage selon le procédé float. En effet, il apparaît que les compositions selon l'invention qui présentent une économie du point de vue coût des matières premières, peuvent être fondues puis formées selon le procédé "float". La diminution de la teneur en oxydes alcalins conduit inévitablement à une augmentation de la viscosité aux hautes températures mais il s'est avéré que la fusion pouvait encore être obtenue sans coût énergétique complémentaire. Par ailleurs, les inventeurs ont également mis en évidence que les temps d'affinage habituellement utilisés pouvaient être diminués; une telle diminution peut soit diminuer encore les coûts de production, soit compenser une éventuelle demande d'énergie plus importante pour la fusion.The inventors were thus able to overcome a technical prejudice which consisted in thinking that a drop in the alkali content would lead on the one hand to an impossible melting and on the other hand, would lead to a devitrification during forming according to the float process. Indeed, it appears that the compositions according to the invention which present an economy from the point of view of cost of raw materials, can be melted and then formed according to the "float" process. The decrease in the content of alkaline oxides inevitably leads to an increase in viscosity at high temperatures, but it has been found that fusion can still be obtained without additional energy cost. Furthermore, the inventors have also demonstrated that the ripening times usually used could be reduced; such a reduction can either further reduce production costs, or compensate for a possible higher energy demand for fusion.
Selon une réalisation préférée de l'invention, la teneur en oxydes alcalins est supérieure à 12,50 % et de préférence encore supérieure à 13 %. De telles teneurs en alcalins améliorent notamment la pérennité des réfractaires. De plus, elles simplifient les contraintes de surveillance du four et de l'outil de formage, la fusion et l'affinage étant facilité et les risques de dévitrification diminuant.According to a preferred embodiment of the invention, the content of alkaline oxides is greater than 12.50% and more preferably still greater than 13%. Such alkali contents notably improve the durability of refractories. In addition, they simplify the constraints of monitoring the furnace and the forming tool, melting and refining being facilitated and the risks of devitrification decreasing.
Les oxydes alcalins présents dans les compositions sont essentiellement Na20 et K2O. L'oxyde K2O est quant à lui avantageusement présent sous forme d'impureté.The alkaline oxides present in the compositions are essentially Na 2 0 and K 2 O. The oxide K 2 O is advantageously present in the form of an impurity.
Selon cette réalisation avantageuse de l'invention la teneur en Na2O est ainsi, comprise entre 7 et 13,3 % et de préférence, elle est supérieure à 11 ,1 % et de préférence encore supérieure à 12,5 %.According to this advantageous embodiment of the invention, the Na 2 O content is thus between 7 and 13.3% and preferably it is greater than 11.1% and more preferably still greater than 12.5%.
Dans une variante préférée de l'invention, la somme des teneurs des oxydes CaO et MgO est inférieure à 13 %. Selon cette variante, la somme des teneurs des oxydes CaO et MgO est inférieure à celles des compositions habituellement fondues pour réaliser du verre plat sur float. Cette diminution de la teneur de ces oxydes peut contribuer à la diminution du risque de dévitrification par un abaissement de la température de dévitrification.In a preferred variant of the invention, the sum of the contents of the CaO and MgO oxides is less than 13%. According to this variant, the sum of the contents of the CaO and MgO oxides is lower than that of the compositions usually melted for producing flat glass on float. This decrease in the content of these oxides can contribute to reducing the risk of devitrification by lowering the devitrification temperature.
Par ailleurs, une diminution de la teneur de ces oxydes permet de diminuer la densité du verre fabriqué. Cette conséquence peut également contribuer à une diminution des coût de production du verre plat. En effet, le marché du verre plat fixe un prix au mètre carré de verre et non en fonction de son poids ; une diminution de la densité du verre conduit donc systématiquement à un rendement économique plus important.Furthermore, a reduction in the content of these oxides makes it possible to reduce the density of the glass produced. This consequence can also contribute to a reduction in the production costs of flat glass. The flat glass market fixes a price per square meter of glass and not according to its weight; a reduction in the density of the glass therefore systematically leads to a higher economic yield.
D'autre part, une baisse de la densité et donc un allégement surfacique peut intéresser l'industrie automobile qui vise de plus en plus à réduire le poids des véhicules notamment pour ceux propulsés à partir d'énergie électrique.On the other hand, a drop in density and therefore a reduction in surface area may interest the automobile industry which increasingly aims to reduce the weight of vehicles, in particular for those powered by electric energy.
De préférence, la composition de verre possède un strain point (température pour laquelle la viscosité η est telle que log η= 14,6) compris entre 540 et 550°C et de préférence encore entre 547 et 548°C. Ces valeurs, permettent notamment de conserver des conditions habituelles de traitement du verre plat par exemple pour réaliser un bombage, une trempe...Preferably, the glass composition has a strain point (temperature for which the viscosity η is such that log η = 14.6) between 540 and 550 ° C and more preferably between 547 and 548 ° C. These values make it possible in particular to maintain the usual conditions for treating flat glass, for example for bending, tempering, etc.
De préférence encore, selon l'invention, la différence entre la température correspondant à une viscosité telle que Log η = 3,5 et la température de liquidus est supérieure à 50°C. Selon ce critère, il est possible de former un verre plat selon la technique float avec des risques très limités de dévitrification et des conditions de travail confortables en ce qui concerne le palier de travail.More preferably, according to the invention, the difference between the temperature corresponding to a viscosity such that Log η = 3.5 and the liquidus temperature is greater than 50 ° C. According to this criterion, it is possible to form a flat glass using the float technique with very limited risks of devitrification and comfortable working conditions with regard to the working level.
Il s'est avéré pendant les essais que ce palier de travail pouvait être encore plus important. Un palier aussi important peut encore conduire à des économies plus ou moins directement ; en effet, il est soit possible de diminuer la température du verre au moment de la coulée sur le bain d'étain, ce qui peut conduire à des économies d'énergie, soit possible d'augmenter la tirée, c'est à dire la quantité de verre plat produite par unité de temps, et donc d'améliorer le rendement.It turned out during the tests that this level of work could be even more important. Such a large level can still lead to more or less direct savings; in fact, it is either possible to decrease the temperature of the glass at the time of casting on the tin bath, which can lead to energy savings, or it is possible to increase the draft, that is to say the quantity of flat glass produced per unit of time, and therefore improve the yield.
Selon une variante préférée de l'invention, la matrice de la composition de verre comprend les constituants ci-après dans les propositions pondérales suivantes :According to a preferred variant of the invention, the matrix of the glass composition comprises the following constituents in the following weight proposals:
SiO2 72 - 74,3 %SiO 2 72 - 74.3%
AI2O3 0 - 1 ,6 %AI 2 O 3 0 - 1.6%
Na2O 11 ,1 - 13,3 % K2O 0 - 1 ,5 %Na 2 O 11, 1 - 13.3% K 2 O 0 - 1.5%
CaO 7,5 - 10 %CaO 7.5 - 10%
MgO 3,5 - 4,5 %MgO 3.5 - 4.5%
Fe2O3 0,1 - 1 %Fe 2 O 3 0.1 - 1%
Les compositions ainsi définies selon l'invention mettent en évidence, par rapport aux compositions habituellement fondues et transformées en verre plat selon le procédé float, une baisse des teneurs en oxyde Na2O qui conduit à une économie du point de vue des coûts de matières premières. Par ailleurs, les teneurs des oxydes alcalino-terreux, et plus particulièrement la teneur en CaO sont diminuées, notamment pour limiter les risques de dévitrification et diminuer la densité du verre. Cette dernière caractéristique, diminution de la densité du verre, est renforcée du fait que les diminutions des teneurs d'oxydes qui viennent d'être évoquées sont compensées par une augmentation de la teneur en silice toujours en comparaison des compositions habituellement fondues pour former du verre plat selon le procédé float.The compositions thus defined according to the invention show, compared to the compositions usually melted and transformed into flat glass according to the float process, a drop in the Na 2 O oxide contents which leads to savings from the point of view of material costs. raw. Furthermore, the contents of alkaline earth oxides, and more particularly the CaO content, are reduced, in particular to limit the risks of devitrification and reduce the density of the glass. This last characteristic, a decrease in the density of the glass, is reinforced by the fact that the decreases in the oxide contents which have just been mentioned are compensated for by an increase in the silica content always in comparison with the compositions usually melted to form glass. flat using the float process.
Concernant l'alumine AI2O3 sa teneur peut atteindre 1 ,6 % du fait de la teneur de certains sables utilisés comme matières premières. Cette teneur en AI2O3 est toutefois avantageusement inférieure à 1 % et de préférence encore inférieure à 0,6 %. L'alumine est toutefois avantageusement présente avec une teneur d'au moins 0,2 % notamment pour son rôle de stabilisant.Regarding alumina AI 2 O 3 its content can reach 1.6% due to the content of certain sands used as raw materials. This content of Al 2 O 3 is however advantageously less than 1% and more preferably still less than 0.6%. Alumina is however advantageously present with a content of at least 0.2%, in particular for its role as stabilizer.
La teneur en oxyde K2O peut atteindre 1 ,5 %, celui-ci pouvant également être apporté par certains sables utilisés comme matière première. La teneur en potasse est toutefois avantageusement inférieure à 0,5 % et de préférence inférieure à 0,2 %.The content of oxide K 2 O can reach 1.5%, this can also be provided by certain sands used as raw material. The potash content is however advantageously less than 0.5% and preferably less than 0.2%.
La composition de verre selon l'invention peut comprendre d'autres constituants, notamment tous les constituants connus de l'homme du métier pour la réalisation de verres colorés.The glass composition according to the invention can comprise other constituents, in particular all the constituents known to those skilled in the art for producing colored glasses.
Une composition de verre, non colorée, tout particulièrement intéressante est telle que sa matrice comprend les constituants ci-après dans les propositions pondérales suivantes :A composition of glass, non-colored, very particularly advantageous is such that its matrix comprises the following constituents in the following weight proposals:
SiO2 73,6 %SiO 2 73.6%
AI,O, 0,6AI, O, 0.6
Na2O 13,1 % K2O 0,2 %Na 2 O 13.1% K 2 O 0.2%
CaO 8,4 %CaO 8.4%
MgO 3,6 %MgO 3.6%
Fe2O3 0,1 %Fe 2 O 3 0.1%
Autres oxydes 0,4 %Other oxides 0.4%
D'autres détails et caractéristiques avantageux de l'invention ressortiront de la comparaison faite entre une composition utilisée habituellement pour former du verre plat selon le procédé float et une composition selon l'invention.Other details and advantageous characteristics of the invention will emerge from the comparison made between a composition usually used to form flat glass according to the float process and a composition according to the invention.
Les deux compositions comparées sont les suivantes : (les teneurs sont exprimées en pourcentages pondéraux).The two compositions compared are the following: (the contents are expressed in percentages by weight).
Tout d'abord, pour comparer la possibilité de fondre la composition A selon l'invention par rapport à la fusion de la composition B, ont été réalisés des tests de fusibilité. Pour réaliser ces tests, les verres sont élaborés en four à flammes Sheffield (brûleur propane, [02] = 1 ,4 - 1 ,7 %) dans des pots en platine placés sur la périphérie d'une sole circulaire en rotation. On réalise une série de fusions individuelles de 200 g de verre avec quatre pots dans le four et avec les ouvreaux ouverts de façon constante. La température a été réglée a 1470°C. Les deux enfournements de chaque fusion sont espacés de 20 minutes et on coule la totalité des 200 g de verre 15 minutes après le deuxième enfournement en une plaque d'environ 1 cm d'épaisseur. Après la recuisson à 550°C et sur la base d'une inspection visuelle sur binoculaire (réalisé sur un certain nombres de surfaces de 1 cm2 délimitées sur chaque plaque), on arrive pour chaque plaque à une densité moyenne d'infondus convertis alors en infondus au kilo. La disparition des infondus étant peu linéaire nous comparons le logarithme du nombre d'infondus.First of all, to compare the possibility of melting composition A according to the invention with respect to the melting of composition B, fusibility tests were carried out. To carry out these tests, the glasses are produced in a Sheffield flame oven (propane burner, [0 2 ] = 1, 4 - 1, 7%) in platinum pots placed on the periphery of a rotating circular hearth. A series of individual fusions of 200 g of glass is carried out with four pots in the oven and with the openers constantly open. The temperature was set at 1470 ° C. The two ovens of each fusion are spaced 20 minutes apart and all 200 g of glass are poured 15 minutes after the second oven into a plate about 1 cm thick. After the annealing at 550 ° C and on the basis of a visual inspection on binocular (carried out on a certain number of surfaces of 1 cm 2 delimited on each plate), one arrives for each plate at an average density of unfonded converted then unfounded per kilo. Since the disappearance of the unsinkable is not linear, we compare the logarithm of the number of the unsinked.
Les résultats des mesures sont exprimés ci-après :The results of the measurements are expressed below:
• Composition A : 4,69• Composition A: 4.69
• Composition B : 4,62• Composition B: 4.62
Ces résultats montrent une fusibilité de la composition A peu différente de celle de la composition B. Ces résultats ont été vérifiés lors d'une fusion dans un four en conditions industrielles qui a permis de réaliser selon des conditions habituelles de fonctionnement un ruban de verre selon le procédé float.These results show a fusibility of composition A little different from that of composition B. These results were verified during a melting in an oven under industrial conditions which made it possible to produce, under usual operating conditions, a glass ribbon according to the float process.
Les caractéristiques de ces verres ont également été mesurées et sont reproduites ci-après :The characteristics of these glasses have also been measured and are reproduced below:
correspondant aux viscosités η telles que log η = 2 et log η = 3,5. T iiq est la température de liquidus. corresponding to viscosities η such that log η = 2 and log η = 3.5. T iiq is the liquidus temperature.
Ces résultats montrent tout d'abord que la composition selon l'invention peut présenter une fusion un peu plus délicate que celle de la composition B.These results show first of all that the composition according to the invention can have a slightly more delicate melting than that of composition B.
Toutefois, comme il a été dit précédemment les inventeurs ont mis en évidence que le temps d'affinage pouvait être réduit, ce qui autorise une fusion et un affinage des compositions selon l'invention dans les conditions habituelles de fusion.However, as has been said previously, the inventors have demonstrated that the ripening time could be reduced, which allows melting and refining of the compositions according to the invention under the usual melting conditions.
Les températures de liquidus, T Iiq, et T log η = 3,5 mettent en évidence la possibilité de former un ruban de verre selon le procédé float. Il s'avère même, contrairement à ce qui pouvait être attendu, que la plage de travail pour le formage du verre est supérieure à celle des compositions antérieures. Les compositions selon l'invention autorisent donc une fusion et un formage du verre selon le procédé float avec un coût des matières premières nettement diminuées. Par ailleurs, la densité du verre formé à partir de ces compositions est inférieure à celle des compositions antérieures, ce qui conduit également à une économie non négligeable. En effet, si la variation de densité qui apparaît entre les compositions A et B semble peu importante, il faut noter que cette variation intervient directement sur le coût du produit fini. The liquidus temperatures, T Iiq, and T log η = 3.5 demonstrate the possibility of forming a glass ribbon according to the float process. It even turns out, contrary to what could be expected, that the working range for glass forming is greater than that of the previous compositions. The compositions according to the invention therefore allow melting and forming of the glass according to the float process with a significantly reduced cost of raw materials. Furthermore, the density of the glass formed from these compositions is lower than that of the previous compositions, which also leads to a significant saving. In fact, if the variation in density which appears between compositions A and B does not seem significant, it should be noted that this variation intervenes directly on the cost of the finished product.

Claims

REVENDICATIONS
1. Composition de verre de type silico-sodo-calcique destinée à être transformée en verre plat selon le procédé float, caractérisée en ce que la teneur en oxydes alcalins est comprise entre 9 et 13,3 %.1. Glass composition of the soda-lime-silica type intended to be transformed into flat glass according to the float process, characterized in that the content of alkaline oxides is between 9 and 13.3%.
2. Composition de verre selon la revendication 1 , caractérisée en ce que la teneur en oxydes alcalins est supérieure à 12,5 % et de préférence supérieure à 13 %.2. Glass composition according to claim 1, characterized in that the content of alkaline oxides is greater than 12.5% and preferably greater than 13%.
3. Composition de verre selon la revendication 1 ou la revendication 2, caractérisée en ce que la teneur en Na2O est comprise entre 7 et 13,3 %.3. Glass composition according to claim 1 or claim 2, characterized in that the Na 2 O content is between 7 and 13.3%.
4. Composition de verre selon la revendication 3, caractérisée en ce que la teneur en Na2O est supérieure à 11 ,1 % et de préférence supérieure à 12,5 %.4. Glass composition according to claim 3, characterized in that the Na 2 O content is greater than 11.1% and preferably greater than 12.5%.
5. Composition de verre selon l'une des revendications précédentes, caractérisée en ce que la somme des teneurs des oxydes CaO et MgO est inférieure à 13,5 %.5. Glass composition according to one of the preceding claims, characterized in that the sum of the contents of the oxides CaO and MgO is less than 13.5%.
6. Composition de verre selon l'une des revendications précédentes caractérisée en ce que le strain point est compris entre 540 et 550°C et de préférence entre 547 et 548°C.6. Glass composition according to one of the preceding claims, characterized in that the strain point is between 540 and 550 ° C and preferably between 547 and 548 ° C.
7. Composition de verre selon l'une des revendications précédentes, caractérisée en ce que la différence entre la température correspondant à une viscosité telle que Log η = 3,5 et la température de liquidus est supérieure à 50°C.7. Glass composition according to one of the preceding claims, characterized in that the difference between the temperature corresponding to a viscosity such that Log η = 3.5 and the liquidus temperature is greater than 50 ° C.
8. Composition de verre selon l'une des revendications précédentes, caractérisée en ce que la matrice comprend les constituants ci-après dans les proportions pondérables suivantes :8. Glass composition according to one of the preceding claims, characterized in that the matrix comprises the following constituents in the following weightable proportions:
SiO2 72 - 74,3 %SiO 2 72 - 74.3%
AI2O3 0 - 1 ,6 %AI 2 O 3 0 - 1.6%
Na2O 11 ,1 - 13,3 %Na 2 O 11, 1 - 13.3%
K2O 0 - 1 ,5 %K 2 O 0 - 1.5%
CaO 7,5 - 10 %CaO 7.5 - 10%
MgO 3,5 - 4,5 %MgO 3.5 - 4.5%
Fe2O3 0,1 - 1 % Fe 2 O 3 0.1 - 1%
9. Composition de verre selon la revendication 8, caractérisée en ce que la matrice comprend les constituants ci-après dans les proportions pondérales suivantes :9. Glass composition according to claim 8, characterized in that the matrix comprises the following constituents in the following weight proportions:
SiO2 73,6 %SiO 2 73.6%
AI2O3 0,6 %AI 2 O 3 0.6%
Na2O 13,1 %Na 2 O 13.1%
K2O 0,2 %K 2 O 0.2%
CaO 8,4 %CaO 8.4%
MgO 3,6 %MgO 3.6%
Fe2O3 0,1 %Fe 2 O 3 0.1%
Autres oxydes 0,4 % Other oxides 0.4%
EP98935073A 1997-07-01 1998-07-01 Soda-lime glass composition Withdrawn EP0928286A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9708261A FR2765569B3 (en) 1997-07-01 1997-07-01 GLASS COMPOSITION OF THE SILICO-SODO-CALCIUM TYPE
FR9708261 1997-07-01
PCT/FR1998/001406 WO1999001391A1 (en) 1997-07-01 1998-07-01 Soda-lime glass composition

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EP0928286A1 true EP0928286A1 (en) 1999-07-14

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JP (1) JP2001500099A (en)
KR (1) KR20000068187A (en)
CN (1) CN1230937A (en)
BR (1) BR9806100A (en)
CO (1) CO5050399A1 (en)
FR (1) FR2765569B3 (en)
PL (1) PL331823A1 (en)
TR (1) TR199900420T1 (en)
WO (1) WO1999001391A1 (en)
ZA (1) ZA985760B (en)

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GB0020471D0 (en) * 2000-08-19 2000-10-11 Pilkington Plc Glass compositions
US6797658B2 (en) 2001-02-09 2004-09-28 Ppg Industries Ohio, Inc. Methods of adjusting temperatures of glass characteristics and glass articles produced thereby
US6878652B2 (en) 2001-02-09 2005-04-12 Ppg Industries Ohio, Inc. Methods of adjusting glass melting and forming temperatures without substantially changing bending and annealing temperatures and glass articles produced thereby
FR2972446B1 (en) * 2011-03-09 2017-11-24 Saint Gobain SUBSTRATE FOR PHOTOVOLTAIC CELL
CN102351413A (en) * 2011-07-13 2012-02-15 苏州维艾普新材料有限公司 Manufacturing method of grade A fireproof and flame retardant energy saving ultrafine glass wool
WO2015000090A2 (en) * 2013-07-04 2015-01-08 Saint-Gobain Glass France Fire-resistant glass pane and fire-resistant glazing
GB201505091D0 (en) 2015-03-26 2015-05-06 Pilkington Group Ltd Glass

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US4897371A (en) * 1987-02-03 1990-01-30 Nippon Sheet Glass Co., Ltd. Glass article protected from coloring by electron rays and method of using
GB8728892D0 (en) * 1987-12-10 1988-01-27 Pilkington Plc Producing molten glass
DE69120509T2 (en) * 1990-11-26 1996-10-31 Central Glass Co Ltd Infrared and ultraviolet radiation absorbing glass
DE4111702C1 (en) * 1991-04-10 1992-10-08 Flachglas Ag, 8510 Fuerth, De

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Title
See references of WO9901391A1 *

Also Published As

Publication number Publication date
FR2765569A1 (en) 1999-01-08
FR2765569B3 (en) 1999-07-16
BR9806100A (en) 1999-08-31
CO5050399A1 (en) 2001-06-27
ZA985760B (en) 1999-01-27
KR20000068187A (en) 2000-11-25
JP2001500099A (en) 2001-01-09
CN1230937A (en) 1999-10-06
TR199900420T1 (en) 1999-08-23
WO1999001391A1 (en) 1999-01-14
PL331823A1 (en) 1999-08-02

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