JPS5818333B2 - Glass larvae - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming a metal oxide film on a glass surface, for example, for the purpose of imparting heat ray reflectivity to a window glass or the like.

Conventionally, to form such a film on a glass surface, a solution of a metal compound melted in an organic solvent such as benzene, alcohol, toluene, etc. is sprayed onto the glass surface at a high temperature using a spray gun, etc. Due to the heat of
It has been proposed or practiced to thermally decompose the metal compound to form a metal oxide film on the glass surface.

However, since the above method uses an organic solvent, there are the following problems.

That is, (2) the glass temperature decreases due to the latent heat of vaporization of the solvent, and the metal compound is not sufficiently thermally decomposed, resulting in deterioration of the optical properties of the formed film, particularly deterioration of reflectance and abrasion resistance.

2) In order to solve the problem in item (1) above, it may be possible to raise the glass temperature in advance so that even if the glass temperature decreases, a temperature sufficient for thermal decomposition of the metal compound can be maintained. , a new problem arises in which the glass warps.

3) The solvent evaporates, resulting in a poor working environment and causing pollution.

4) For example, benzene, alcohol, toluene, etc. are highly flammable and therefore pose a high risk of fire.

In view of the problems mentioned above, without using organic solvents,
It is desirable to suspend the metal compound powder in a gas and spray it onto the glass.

However, if the powder is simply sprayed onto the glass, the powder will be blown off and cannot be reliably attached to the glass surface as desired.

The present invention solves the various problems mentioned above by spraying a metal compound onto a glass surface without using an organic solvent, and also ensures that the metal compound adheres to the glass surface. The object of the present invention is to provide a useful device that can reliably form a metal oxide film.

Embodiments of the present invention will be described below based on illustrative drawings.

The high temperature plate glass 2 continuously supplied from the known continuous plate glass manufacturing apparatus 1 has a temperature of approximately 500 to 600℃.
At 50"C, it is supplied to a slow cooling furnace (not shown).

A blowing tool 4 having a slit gap [] part 9 extending in the width direction of the plate glass 2 near the surface of the plate glass 2 before entering the slow cooling furnace.
It is located.

The slit opening 3 of the spray tool 4 faces the surface of the plate crow 2 and is substantially parallel to the surface thereof, and the spacing therebetween is configured to be adjustable as appropriate.

One end of the spray tool 4 is closed, and the other end is connected to the metal compound supply pipe 1.

This supply pipe 7 is connected to a pipe 8, and a blower 9 is provided in the middle of the pipe 8, whereby fine powder of the metal compound is supplied with air from a supply device (not shown) connected to the pipe 8 to a blower 4. It is configured to supply

As shown in FIG. 2, a metal net 11 having a suitable mesh and a conical metal tube 12 are attached to the connection point 10 between the supply pipe 7 and the pipe 8, so that the pipe 8 is supplied with air. The metal compound powder is regulated by the metal net 11, and the metal compound powder is supplied to the spray tool 4 over its entire length by the conical constriction of the metal cylinder 12. It is.

The spray tool 4 is made of an alumina heat-resistant insulating material, and has an electrode coil 6 disposed therein, one end of which is connected to a high-voltage power source 5 (approximately 60,000 minus poles 1~). 6 and a plate glass 2 at ground potential having an electrical resistance of about 103 Ω, causing a corona discharge 13,
Due to this corona discharge 13, the fine powder of the metal compound supplied into the spray tool 4 is charged with a negative charge.

The charged metal compound fine powder flow passes through the slit-shaped opening 3 and is accelerated toward the surface of the glass plate 2, and the negatively charged metal compound fine powder is uniformly distributed on the surface of the glass plate 2 due to Coulomb force. , and is securely attached.

The metal compound attached to the surface of the glass plate 2 is further thermally decomposed by the heat of the glass plate 2 and converted into a metal oxide, thereby forming a coating 14 of uniform thickness on the surface of the glass plate 2.

Incidentally, the blowing tool 4 may be moved back and forth in the advancing direction of the glass plate 2 or in the lateral direction.

Further, the shape of the spraying tool 4 may be as shown in FIG. 4, for example, and the shape can be changed in various other ways.

Furthermore, in order to raise the temperature of the plate glass, the plate glass 2 that is continuously supplied from the plate glass manufacturing apparatus 1 may be reheated as an auxiliary method, or the plate glass 2 that has been completed as a product may be reheated. .

Furthermore, as the metal compound powder, an acetylacetonate metal salt (for example, cobalt acetylacetonate-t-
Organic or inorganic metal salts that are easily thermally decomposed such as chromium acetylacetonate, iron acetylacetonate, titanium acetylacetonate) are used, and the particle size distribution is preferably as shown below.

10μ or less 10% 10-20μ 40% 20-30μ 40% 30μ or more 7'10% Furthermore, although the main target is root glass, various other glass products can be used.

Furthermore, a gas other than air, such as an inert gas, may be used as the transport medium for the metal compound.

The gas may be at room temperature, but if it is preheated to about 100 to 120°C, the powder will be easily thermally decomposed on the glass surface, making it easier to form a metal oxide film.

In summary, the apparatus for forming a metal oxide film on the surface of glass 2 according to the present invention uses a cylindrical spraying film having a slit-shaped opening 3 extending in the width direction of glass plate 2 near the surface of high-temperature glass plate 2 in a transfer path. A tool 4 is provided, configured to supply a gas in which a metal compound is suspended to the blowing tool 4, and an electrode 6 for causing discharge between the plate glass 2 and the blowing tool 4 is disposed within the blowing tool 4, The metal compound sprayed onto the surface of the glass plate 2 from the spraying tool 4 is charged by passing through a discharge field surrounded by the cylindrical spraying tool 4. This is an oxide film forming device.

That is, by attaching a metal compound to the surface of a sheet glass by electrical action, it is possible to solve the environmental health problems and fire hazards caused by the use of organic solvents, and moreover, it is possible to reliably attach the metal compound to the surface of the sheet glass as desired. It has become possible to attach it to the glass surface.

In particular, in the present invention, since the opening of the spray tool is formed into a slit shape extending in the width direction of the plate glass, it is possible to uniformly spray a substantially constant amount to a predetermined value of the glass, and also to spray onto the glass surface. By spraying at close locations, it is possible to prevent the fine metal compound powder from scattering as much as possible.

Further, since a discharge electrode is disposed directly opposite the cylindrical spraying tool, and the metal compound sprayed from the spraying tool onto the surface of the plate glass passes through a discharge field surrounded by the cylindrical spraying tool. It is possible to reliably and efficiently charge the metal compound passing through the contacting tool, and it is possible to reliably form a film on a continuous glass surface.

[Brief explanation of drawings]

Fig. m1 illustrates an embodiment of the apparatus for forming a metal oxide film on a glass surface according to the present invention, Fig. 1 is a partially cutaway schematic perspective view, Fig. 2 is a partially exploded perspective view, and Fig. 3 is an essential part. Fig. 4 is a longitudinal sectional view of a main part showing another embodiment. 2...Glass, 3...Slit-shaped opening, 4...Blowing tool, 6...Electrode.

Claims (1)

[Claims] 1. A cylindrical spray tool 4 having a slit-shaped opening 3 extending in the width direction of the glass plate 2 is provided near the surface of the high-temperature glass plate 2 in the transfer path, and a gas in which a metal compound is suspended is directed into the spray tool 4. an electrode 6 arranged in the spraying tool 4 for causing discharge between the plate glass 2 and the plate glass 2;
The metal compound sprayed onto the surface of the glass plate 2 from the spraying tool 4 is charged by passing through a discharge field surrounded by the cylindrical spraying tool 4. Oxide film forming equipment.