RU2145945C1 - Method of making decorative sheet glass - Google Patents

Abstract

FIELD: chemical industry. SUBSTANCE: method comprises feeding solid dispersed carbon-containing reactant onto metal melt. Several mechanisms of feeding and distributing reactants are used, each treating only some portion of glass tape. EFFECT: preparation of decorative glass having thickness of 3-5 mm and different thickness of 0.3 mm. 2 cl, 1 dwg

Description

 The invention relates to methods for the production of sheet glass on the surface of molten metal.

 A known method of decorating glass, which includes forming a ribbon on a molten metal, feeding a solid reagent to the surface of the molded glass in a gas stream, in which organic substances, for example wood particles (sawdust, wood shavings, etc.) are used as a reagent.

 The disadvantages of the method are the uneven coating of the glass with the material, the requirement of a high gas pressure for casting the material over the entire width of the tape, blowing the material from the glass onto the molten metal and contamination of the latter (Russian patent N 2096359, MKI C 03 B 18/14).

 In this method, the uniformity of the pattern is achieved by the fact that the middle part of the tape, where the temperature is higher, is processed further along the tape. Thus, the processing temperature of the sides and the middle of the tape is aligned. The method cannot be applied if solid dispersed particles are used for glass decoration and the Metelitsa glass is 3-5 mm thick with a guaranteed thickness of no more than 0.3 mm.

 The present invention is free from these shortcomings in that it contains several mechanisms for feeding and spraying dispersed materials operating at low gas pressure, each of which processes only part of the tape. In this case, it is easy to obtain a “Blizzard” with a thickness of 3-5 mm and a thickness of 0.3 mm without contaminating the tin melt with reagent pyrolysis waste.

 SUMMARY OF THE INVENTION

 A method of manufacturing a decorative sheet glass, including forming a tape, transporting a decorative reagent through a channel in the form of solid dispersed particles using a metering and mixing particles with gas, controlled separation of the flow into gas and particles using a separation mechanism, uniformly falling particles onto glass, characterized in that the mechanisms for separating the flow into gas and particles use at least two, each of which processes only part of the glass ribbon.

As a decorating reagent, sawdust, sunflower husk, and the floor of cereal crops can be used. Reagent particles, falling on glass at a temperature of 900 ^o C in a reducing atmosphere, are subjected to pyrolysis (thermal decomposition) with the rapid release of gaseous hydrocarbons that process glass. In this case, the particle is on the "gas" pillow and has a low adhesion to the glass. A gas pressure of 0.08 kgf / cm ^{2 is} enough to move particles across the glass and hit them on the tin melt. The particle throwing range at this pressure is only ~ 900 mm, which cannot cover the entire width of the glass ribbon. According to this invention, it is proposed to work on gas pressure, excluding the blowing of material from the glass, but to supply a mixture of material with gas or from two sides towards each other or from one side, but using at least two mechanisms for feeding and separating the mixture with different nozzle positions in relation to glass. In both cases, the smallest uniformity of glass closure with the material, the highest quality glass pattern without tin contamination, is achieved at the lowest pressure.

 Contamination of tin with carbon particles is unacceptable, since it impedes the movement of the glass tape over the melt, creates an emergency situation leading to the "break" of the glass tape.

 The invention is illustrated in the drawing, which shows a device that implements the present invention.

 The device consists of mechanisms for dispensing and mixing particles located outside the melt pool and mechanisms for the controlled separation of the flow into gas and dispersed material, placed in the window of the melt pool 9 across the direction of movement of the glass ribbon 10.

 Dosing and mixing mechanisms consist of an electric motor 1, gearbox 2, mixer 3, hopper with material 4. The mechanisms are interchangeable and are connected to the flow separation mechanism using flanges 5.

 The mechanism for separating the gas stream with particles is a water-cooled circuit 6 with a partition 7 that divides the inner space of the circuit into two equal parts, where the channels with nozzles exit 8. Restricting the gas flow to the walls of the circuit increases the flow rate and the casting range of the material by 30%, which allows working at low gas pressures. The supply of material from two sides towards each other completely eliminates the ingress of material on the tin 11. The device contains, in addition to the above, two additional channels into which, at the same time, color glass filaments, color frit, powdery dyes can be fed through the dosing mechanism, which allows to obtain color " Blizzard "without the use of additional mechanisms.

Information confirming the possibility of carrying out the invention
The method of decorating glass in accordance with this invention was tested on an industrial line when producing a glass tape with a thickness of 4.5 mm. For this, at the maximum allowable pressure, excluding the blowing of material from the glass, shielding gas was supplied to the nozzles on both sides of the tape located with an offset along the course of the tape. To mix the gas with the material, the dosing mechanism and the displacement of the material were used, which were attached to the flow separation mechanism using flanges located to the right and left of the glass tape. The separation mechanisms in the device contain at least two, each of which contains flanges on the right and left for connecting interchangeable mechanisms for dispensing and mixing particles. The mechanism of dosing and mixing of particles works as follows. The electric motor 1 through the gearbox 2 rotates the hollow screw of the mixer 3, into the internal cavity of which the protective atmosphere gas is supplied. The screw ribs the coils captures the material from the hopper 4 and pours it into the gas stream. The stream accelerates in channel 8 and is fed into the mechanism for separating the stream into gas and particles. For this, the mechanism is equipped with special barriers (not shown). In the separation mechanism, the gas rises upward, at the same time the material begins to fall out of it, uniformly closing part of the tape under the stream.

 At the same time, on the other hand, a similar dosing mechanism works, which covers the rest of the tape. It is allowed to install both mechanisms on the one hand, but then one of the channels should be longer and reach the middle of the tape. In both cases, at the optimum gas pressure, pyrolysis products are not allowed to enter the metal melt.

The proposed method was tested in experimental conditions and a batch of glass in the amount of 3 thousand m ^{2 was} produced. The consumption of decoding material was 6 kg per 1000 m ^{2 of} glass. The thickness difference did not exceed 0.3 mm.

Claims (2)

 1. A method of manufacturing a decorative sheet glass, including forming a tape, transporting a decorative reagent through a channel in the form of solid dispersed particles using a metering mechanism and mixing particles with gas, adjustable separation of the flow into gas and particles using a separation mechanism, uniform precipitation of particles on glass, characterized in that the mechanisms for separating the flow into gas and particles use at least two, each of which processes only part of the glass ribbon.  2. The method according to p. 1, characterized in that the flows are directed from the sides toward each other with an offset along the course of the tape perpendicularly or at some angle to the tape.