RU2174497C1 - Method of preparing decorative glass - Google Patents

Abstract

FIELD: manufacture of float glass having controllable pattern. SUBSTANCE: nature of glass pattern is controlled by amount and speed of thinning machines, rotation speed of each subsequent pair of machines being less than that of preceding pairs thus forming several "pools" of plastic glass band and, hence, rapture of modified layer both longitudinally and across. Pattern is further controlled by location site of thinning machines, by angle of turn thereof and pulsed feeding of modifying reagent. EFFECT: wider range of manufacture of decorative glass. 4 cl, 1 dwg

Description

1. The prior art
The invention relates to a method for manufacturing decorative sheet glass on molten metal and can be used to produce float glass of the Metelitsa type with an adjustable pattern according to its type of thickness

 A known method according to ed. St. N 869282, MKI C 03 B 18/02, according to which it is proposed to reduce the thickness of the produced decorative glass by processing the glass melt with a reagent before draining it onto the surface of the metal melt, followed by the formation of an equilibrium or thinned tape. The disadvantage of this method is the following: when the glass is processed before it is drained, a surface film is formed, which, when the glass is drained and spread, mixes with the main untreated layers of glass and, therefore, the decorative effect is negligible, especially if there is no subsequent thinning of the tape.

 A known method of producing glass "Metelitsa" with a thickness of less than 6 mm (RF patent N 2133714, C 03 C 17/02, C 03 B 18/14), in which dispersed materials are used as a modifying reagent, including sawdust supplied from mixtures with a gas stream.

 The disadvantage of this method is that it is not possible to obtain an adjustable pattern.

 In addition, sawdust used as a reagent contains a large amount of moisture, which reduces the quality of the protective atmosphere in the molten bath. The increased moisture content in the protective atmosphere leads to the oxidation of the tin melt, with the tin intensely interacting with glass in the form of tin diffusion into the glass and tin oxides sticking to the lower surface of the glass ribbon. Therefore, this method is unsuitable for long periods of glass production "Metelitsa".

 By author St. N 467040, MKI C 03 B 18/02, C 03 C 23/00, taken as the closest prototype, it is proposed to treat the glass surface with a reagent in the spreading zone in the melt pool, and then break the surface layer of the glass by stretching the tape. As a reagent, it is proposed to use vapors of saturated and unsaturated hydrocarbon compounds, as well as products of dry distillation of wood and other organic substances.

 The disadvantage of this method is that it cannot be used to adjust the pattern on the surface of the tape, the thickness and thickness of the glass, since in this case the traditional method of thinning float glass is used, in which the speeds of each pair of thinning machines sequentially increase in the direction of the output end of the melt bath.

 In this method of producing Metelitsa glass, its glossy areas are significantly thinned compared to matte, creating an extreme thickness difference that is limited by the thickness of the glass. Therefore, in this way, with acceptable thickness variation, which ensures normal annealing and cutting, it is possible to obtain Metelitsa glass of predominantly thick denominations (thickness 6-7 mm).

2. The invention
A method of manufacturing decorative sheet glass is carried out by molding a glass ribbon on a molten metal with simultaneous treatment of the glass surface with a reagent to create a modified layer and then breaking it, while the nature of the glass pattern is controlled by the number and speed of drowning bead-forming machines, and the rotation speed of each subsequent pair is lower than the previous one.

As a reagent, a gas mixture, for example, propane-butane, powder compounds and a mixture of organic and / or inorganic substances can be used to increase the viscosity of the surface layer of the glass ribbon by stirring it and changing its chemical composition, followed by stretching to break the formed high-viscosity surface layer of glass . In this case, an additional effect on the nature of the gap is provided by on-board forming machines, for example, roller or track type, installed in the temperature range of 800-1000 ^o C. Moreover, the speed of the next pair of machines is less than the previous one and is in the ratio 1: (0.5-0.95) , which ensures the formation of several "puddles" of plastic glass tape and, accordingly, the rupture of the modified layer not only in the longitudinal but also in the transverse directions.

The nature of the pattern (small, medium, large) is additionally regulated by the number of drowning machines, their location and the angle of their rotation with respect to the direction of production of the glass tape. At the same time, the thickness of the glass and the thickness difference between the matte and glossy areas are reduced. The angle of rotation of the onboard forming machines is set to 10 ^o .

 In addition, in order to give an originality to the pattern, the supply of the reagent can be carried out in the form of pulses with different periodicities.

3. The list of drawings
The drawing illustrates the process of forming glass "Metelitsa-Blues" in accordance with the invention.

4. Information confirming the possibility of carrying out the invention
This invention is illustrated by the following examples.

Example 1. To obtain glass "Metelitsa-Blues" with a thickness of 5.0-5.5 mm, the glass strip 1 was produced on two pairs of sinking machines 2 located after the gas distribution device 3, while the temperature in the area of the gas distribution device was 870-880 ^o C.

The main technological parameters of molding:
- removal of glass melt 95 ± 2 t / day;
- channel temperature 1100 ± 2 ^o C;
- the ratio of speeds of airborne machines 1: 0.8;
- the angle of rotation of the airborne machines 4 ± 1 ^o .

 Under such tensile forces, thinning of the tape occurs in a high temperature zone in which the surface of the glass is not yet coated with a modifying reagent. In this case, the thickness of the produced glass ribbon "Metelitsa-Blues" is 1.0-1.2 mm. This is achieved due to the additional expansion of the glass ribbon in the low-temperature region, in which tensile forces act less strongly on the treated surface.

 The decorative pattern thus obtained on the glass ribbon is a finer, smoother pattern than the traditional Metelitsa glass.

Example 2. To obtain glass "Metelitsa-Blues" with a thickness of 4.5-5.0 mm, tape 1 was produced on three pairs of sinking machines 2 located after the gas distribution device 3, while the temperature in the area of the modifying device was 880-890 ^o C .

The main technological parameters of molding:
- removal of glass melt 118 ± 2 t / day;
- channel temperature 1120 ± 2 ^o C;
- the ratio of speeds of airborne machines 1: 0.9; 1: 0.7;
- the angle of rotation of the airborne machines 7 ± 1 ^o .

 Under such molding conditions, the thickness of the Metelitsa-Blues glass reaches 4.5 mm with a thickness difference of 0.5-0.7 mm. The picture is a pattern consisting of small matte and glossy areas that create a game of glare. The relief is practically absent, the pattern is formed only on the surface of the glass.

Example 3. To obtain glass "Metelitsa-Blues" with a thickness of 4.0-4.5 mm, the first pair of thinning machines 2 was placed in the temperature zone 930-950 ^o C before the device for processing with modifying reagent 3. After this device, a second and a third pair of drowning machines.

The main technological parameters of molding:
- removal of glass melt 115 ± 2 t / day;
- channel temperature 1100 ± 2 ^o C;
- the ratio of speeds of airborne machines 1: 0.9; 1: 0.8;
- the angle of rotation of the airborne machines 2 ± 1 ^o .

 Under these molding conditions, the thinning of the tape occurs mainly due to the first pair of sinking machines. The pattern is formed only by two pairs of sinking machines located after the modifying device, due to which a smaller thickness difference between glossy and matte areas is achieved, which is 0.7-1.0 mm.

 Example 4. To obtain a decorative pattern of the type "Metelitsa" an experiment was conducted on the pulsed supply of a gas reagent to the glass tape with different frequencies from 0.1 to 10 seconds.

 The pattern that forms on the glass ribbon is an alternation of smooth glossy and decorative stripes in the form of a small Metelitsa-Blues pattern.

 Thus, the developed Metelitsa-Blues glass molding technology allows you to get a pattern with a different decorative effect depending on the ratio of the speeds of the bead-forming machines, their location, pivot angles and the frequency of reagent supply.

 In addition, the proposed method allows to produce decorative glass "Metelitsa-Blues" on high-performance industrial lines in a wider range of decorative effect, since such lines can use a larger number of pairs of drowning machines and, accordingly, more diverse options for the ratio of speeds between airborne devices.

Claims (4)

 1. A method of producing decorative glass by forming a glass ribbon on a molten metal with simultaneous processing of the glass surface with a reagent that creates a modified layer and its subsequent rupture, characterized in that the character of the glass pattern is controlled by the number and speed of drowning bead-forming machines, and the rotation speed of each subsequent pair is less the previous one.  2. The method according to claim 1, characterized in that the rotation speed of the previous pair of drowning machines to the next is in the ratio 1: (0.5-0.95). 3. The method according to claim 1, characterized in that the angle of rotation of the bead-forming machines is set to 10 ^o .  4. The method according to claim 1, characterized in that as the reagent can be used organic and inorganic gaseous, solid, liquid substances and mixtures thereof.