PL65103B1

PL65103B1 -

Info

Publication number: PL65103B1
Application number: PL124941A
Authority: PL
Inventors: Plumat Emile
Original assignee: Glaverbel
Filing date: 1968-01-27
Publication date: 1972-02-29

Description

Taka sa¬ ma krzywizne mozna uzyskac przy temperaturze 450°C, lecz stan elastycznosci musi trwac pól godziny.Przyklad III. Sposób zgodny z wynalazkiem byl zastosowany do wyginania arkusza o wymiarach 0,2X0,5X0,003 m szkla borokrzemowego o nastepuja¬ cym skladzie wagowym: Si02 Na20 CaO MgO B203 Fe203 A1203 60% 12% 10% 6% 6% 1% 5% Lepkosc tego szkla w temperaturze 450°C, 535°C i 600°C wynosila odpowiednio 1015, 1013 i 101° puazów.Arkusz szkla byl hartowany chemicznie w czasie trzy¬ dziestu minut, w temperaturze 480°C w kapieli soli sto¬ pionych zawierajacej wagowo 40% KN03, 30% KCl i 30% NaN03.W koncu okresu trzydziestominutowego arkusz byl wygiety mechanicznie i hartowany chemicznie w kapie¬ li o temperaturze 480°C, stopniowo az do krzywizny 5 % w czasie trzydziestu minut. PL PLThe same curvature can be obtained at 450 ° C, but the state of elasticity must last half an hour. Example III. The method according to the invention was used to bend a sheet of 0.2 x 0.5 x 0.003 m borosilicate glass with the following weight composition: SiO 2 Na20 CaO MgO B203 Fe2O3 A1203 60% 12% 10% 6% 6% 1% 5% of this glass at 450 ° C, 535 ° C and 600 ° C were respectively 1015, 1013 and 101 ° poise. The glass sheet was chemically toughened for thirty minutes at 480 ° C in a bath of molten salt containing by weight 40% KN03, 30% KCl and 30% NaNO3. At the end of the thirty minute period the sheet was mechanically bent and chemically quenched in a drip at 480 ° C, progressively to a curvature of 5% in thirty minutes. PL PL

Claims

1. Claims 1. A method for bending a glass sheet, characterized in that the glass sheet is bent during toughening or after chemical toughening when the viscosity of the glass is at least 10 poise. 2. The method according to claim The process of claim 1, wherein the bending of the glass sheet is performed at a viscosity of 1011.5-1014.5 pauses. 3. The method according to p. The method of any of claims 1 and 2, characterized in that the glass sheet, after bending, is chemically toughened at a temperature lower than the temperature of the chemical toughening prior to bending. 4. Device for applying the method according to claim A container (9) containing a bath (8) of liquid salt, clamps (6) for the glass sheet (7) and with resistance heaters (10) located close to it. the bottom of the tank, and includes adjacent to the tank (9) dies (11) and bars (25) for bending the glass sheet. 5. Device variant according to claim 4. The glass sheet according to claim 4, characterized in that the resistance heaters (10) are disposed on the sides of the tank (45), the dies (38, 39) for bending the glass sheet (7) above or inside the tank (45). .KI. 32 a, 23/02 S5103 MKP C 03 b, 23/02 4 »M L g-flii;» and PT ^ 2 Fig. 1, 32 * A * 31 M 30.23 Fig. 3 E rata In patent specification No. 65103, line 10 is missing. After the word "further" there should be: many other suitable materials can be used because PL PL