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Heat treatment method for prestressed glass panes

A window glass and prestressing technology, which is applied in the field of window glass made of heat-treated prestressed glass, can solve the problems of small possibility of crystal nuclei, impossibility of removing glass window glass, etc., and achieve the effect of shortening the duration

Inactive Publication Date: 2008-01-09
SAINT-GOBAIN GLASS FRANCE
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Problems solved by technology

However, when carrying out heated storage tests according to the prior art, after thermal stress treatment of glazings made of glass without cooling in the temperature range in which crystal nuclei form, it was not possible to obtain information on the removal of possibly damaged glazing. Any sufficiently reliable results for glazing, respectively, because the probability of nucleation is very small, and only a small fraction of inclusions in α-NiS are able to nucleate

Method used

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Embodiment Construction

[0036] In terms of examples, the procedure for carrying out the method is briefly described below, directly (straight) to thermally prestressing glazings made of glass.

[0037] The panes of glass leave the prestressing station at about 450° C., at which temperature the panes are preferably quenched by means of cold air. The glazings are then sent individually or in groups to a heat treatment station (oven) where the temperature of the glazing is limited down to -4 degrees K / min (or faster if possible) Temperatures of less than 200°C, for example 130-160°C in the preferred range (for nucleation). Rapid temperature changes are best forced by (forced) convection. The temperature of the glass is then maintained for a time interval of at least 5 minutes and within this range, the glazing made of these glasses preferably being located in a closed chamber. The panes can thus also be moved in a laying position on the conveyor belt. A continuous material outflow can thus be maintai...

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Abstract

The invention concerns a method for heat treatment of prestressed glass panes so as to eliminate specimens liable to spontaneous fracture following the growth of included crystals, in particular by the transformation of nickel sulphide of their alpha -phase into their beta -phase (heat soak test), the glass panes, after prestressing treatment, being maintained, during specific time intervals, at a temperature value accelerating the crystal growth; said method consists in bringing the temperature of the glass panes by controlling in the NiS alpha -inclusions from an initial temperature in the domain of a formation of germs of the beta -phase which is below 250 DEG C and above room temperature (domain of germ formation), the temperature modification when the germ formation domain is brought about by control being higher than 2 degrees K / minute and a temperature modification substantially slower is imposed or a specific temperature being maintained during a specific time interval within the germ formation domain. The method is particularly suitable to be executed immediately after prestressing thermal treatment of glass panes, by first of all lowering their temperature and by maintaining same within said germ formation domain.

Description

technical field [0001] The present invention relates to a method of heat treating glazing made of prestressed (ie tempered) glass in order to remove the tendency of the glazing to spontaneously rupture. Background technique [0002] Therefore, some such methods are known in the heated storage test (called "soak test" in English). Because of the use of glazing made of such prestressed glass, there is an unforeseeable risk of sudden rupture after installation due to crystalline inclusions, namely nickel sulfide particles (NiS), before purchase and installation has been destroyed. In order to avoid the escalating excessive costs when inspecting raw materials, molten frits and glass sheets, the use of these glazings was simulated over an extended period of time under the conditions of use of these glass sheets by means of heated storage tests. This accelerated test is performed very slowly under normal conditions (some years) by the accelerated projection, transfer method and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B32/00C03B29/00C03B29/02C03B29/08
CPCC03B29/08C03B32/00C03B29/025
Inventor A·卡斯珀H·豪泽尔F·鲁伯特
Owner SAINT-GOBAIN GLASS FRANCE
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