JPH0676232B2 - Method and apparatus for forming release agent coating film on glass plate surface - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming a release agent coating film on the surface of a glass plate prior to heat-processing the glass plate and the apparatus therefor, preferably a laminated sheet glass. The present invention relates to a method and an apparatus for forming a release agent coating film on a raw glass plate in advance to prevent fusion when the raw glass plates are stacked and heated and bent in production.

[Prior art and its problems]

In the lap bending process of the laminated glass plate, in order to prevent the fusion of the glass plate, a mold release agent, that is, gypsum, calcium carbonate, talc, mica powder, etc., as it is, or suspended or dissolved in a liquid, or It is known to coat and coat a powder coated with a silicone resin solution on a glass plate (for example, JP-B-54-21847, JP-A-49-28608).
Etc.).

It is convenient that the release agent is sprayed and applied by placing the glass plate in a horizontal posture so that the release agent can be stacked in that posture in a later step and placed on the bending mold.

In the case of the powder release agent, uneven spraying is likely to occur at the time of spraying, sometimes partial fusion occurs, and it is not easy to completely remove the release agent powder after bending the glass plate, and residual foreign matter remains. There are many cases where defects occur. The same applies to the case of using a suspension, but there is a problem that a step of drying after coating and spraying is required, and powder is fixed after the glass plate is bent and its removal becomes difficult.

On the other hand, if it is used as an aqueous solution, it has the advantage that it is easy to obtain a thin uniform coating film during spraying or coating, and it can be dissolved and removed by washing with water even after bending the glass, but after coating and spraying, it must be dried as described above. I have to.

Further, when the glass is applied in a horizontal posture, for example, a coarse-grained release agent or other foreign matter adhered to the ceiling often drops, and a micro-concave portion is formed in the corresponding portion of the glass plate during overlapping bending. Alternatively, there is a problem in that the distortion of the reflected image is recognized, which is called spot distortion and is treated as a defective product.

The present invention provides a method for forming a release agent coating film and an apparatus for the same, which solves the above-mentioned problems and enables a uniform film to be formed easily and easily.

[Means for solving problems]

The present invention is a method of spraying hot air while spraying a release agent aqueous solution on a glass plate surface to dry and solidify it to form a release agent coating film by a plurality of spray means facing a glass plate in an upright posture. At the same time as spraying the release agent aqueous solution substantially perpendicularly to the plate surface, the spraying means is appropriately arranged between the sprays or covers the outer circumference of the spraying means, or is sprayed substantially perpendicularly to the plate surface by a plurality of spraying means arranged on the inner circumference side. In the apparatus related to the above method, hot glass is blown, and a standing stand for a glass plate, its pulling transfer means, and a glass plate transfer path are arranged, and a release agent aqueous solution is confronted with the glass plate. It comprises a plurality of spraying means for spraying substantially perpendicularly to the surface, and a plurality of spraying means arranged between the spraying means as appropriate, or covering the outer circumference of the spraying means or arranged inside the inner circumference.

〔Example〕

 Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the entire perspective view according to the present invention of FIG. 1 and the partial side sectional view of the main part of FIG.
The lower end of the pedestal 2 is connected to the transport chain 3, the upper end is fitted and slidably contacted with the guide rail 4, and the pedestal 2 is carried into the spray booth 5 by the index of the chain 3. Spray booth 5
As shown also in the partial front view of FIG. 3, a hot air blowing hole 7 is provided therein, and the direction of the hole is substantially perpendicular to the glass plate surface 1 and for the release agent solution. A plurality of spray nozzles 6, 6 are arranged between the hot air blowing holes 7, and the nozzles 6,
The direction of 6 also faces the glass plate surface 1 substantially vertically.

The release agent solution is, for example, a solution of Glauber's salt dissolved in warm water of 30 ° C or higher.
The liquid is wt% or more, and is supplied to the nozzles 6 and 6 via a pipe 8 from a mixing tank (not shown) by a pump. Although not shown, compressed air may be separately fed into the nozzles 6, 6 to form an air spray type.

The hot air is, for example, 60 heat-exchanged exhaust gas of a glass sheet heat processing furnace.
Using a heating air above ℃, by a blower not shown,
It is fed from the introduction duct 10 into the spray hole 7. The spray holes 7 are formed of, for example, punching metal 7a as shown in the side sectional view of FIG. 2 and the partial front view of FIG. 3, and the release agent solution spray nozzle 6 is appropriately provided between the punching holes, that is, the spray holes 7. , 6 and if necessary a rectifying plate 7b (shown by a broken line) shown in FIG. 2 so that the hot air can hit the glass plate 1 uniformly and substantially vertically over a wide range.

As another embodiment, as shown in the partial front view showing the relationship between the hot air blowing holes and the spray nozzle for the release agent solution in the punching metal of FIG. 4, the release agent solution is appropriately placed in the hot air blowing holes 7 of the punching metal 7a. The spray nozzles 6, 6 may be inserted.

FIG. 5 is a side sectional view showing still another embodiment, in which the spray nozzle 6 for the release agent solution and the hot air blowing nozzle 7c are arranged concentrically, and the spray nozzle 6 is shown in FIG. It is arranged on the outer circumference of 7c. In addition, when the hot air is blown, for example, a mode in which a swirl flow is directed to the glass plate surface to uniformly disperse the droplets of the release agent can be optionally incorporated.

FIG. 6 is a partial side sectional view showing the relationship between the hot air blowing nozzle and the spray for release agent solution according to still another embodiment. The tip region of the spray nozzle 6 is swollen once and the tip is spread. A cherry-cylindrical tube having hot air blowing nozzles 7d arranged concentrically on the outside thereof is effective in spreading and uniformly dispersing the release agent droplets.

In each of these configurations, the sprayed release agent solution, that is, the Glauber's salt droplets are made to efficiently receive the heat of hot air, and the Glauber's droplets are made into microdroplets having a diameter of several μm to ten and several μm. As a result, the water is easily evaporated by receiving hot air, and when it adheres to the glass plate 1, it becomes a state close to the solidified powder, and at the outlet of the spray booth 5, it is a solidified film, more precisely, a coating of the solidified powder.

Reference numeral 15 in FIG. 1 is a dust collector that adsorbs excess sprayed Glauber's salt and exhausts or circulates the exhaust hot air through an exhaust duct (not shown).

With the above configuration, it is difficult for foreign matter to fall from the ceiling,
Therefore, the release agent coating film can be formed extremely efficiently, efficiently and easily without forming spot strain and by drying while spraying.

〔The invention's effect〕

According to the present invention, it is possible to form a release agent coating film efficiently, efficiently, and easily and easily without causing defects due to falling foreign matter.

[Brief description of drawings]

FIG. 1 is an overall perspective view of the present invention, FIG. 2 is a partial cross-sectional side view of the essential part thereof, and FIGS. 3 and 4 show different modes showing the relationship between a hot air blowing hole and a sodium chloride spray nozzle. FIG. 5 is a partial side sectional view of a main portion of yet another embodiment, and FIG. 6 is a partial side sectional view of yet another embodiment showing the relationship between the hot air blowing nozzle and the spray nozzle. . 1 ... Glass plate, 5 ... Spray booth 6 ... Spray noble, 7 ... Hot air blowing hole

Claims (2)

[Claims] 1. A method of forming a release agent coating film by spraying hot air while spraying an aqueous release agent solution on a glass plate surface to form a release agent coating film by a plurality of spraying means facing a glass plate in an upright posture. The release agent aqueous solution is sprayed substantially perpendicularly to the plate surface, and at the same time, the plurality of spraying means are appropriately arranged between the sprays or cover the outer circumference of the spraying means or are arranged on the inner side of the inner circumference. A method for forming a release agent coating film on a glass plate surface, characterized in that hot air is blown vertically. 2. An apparatus for forming a release agent coating film by spraying hot air while spraying a release agent aqueous solution on the surface of a glass plate to form a release agent coating film, and a standing stand for the glass plate and its traction transfer means,
A plurality of spray means disposed on the glass plate transfer path for spraying the release agent aqueous solution on the glass plate substantially perpendicularly to the plate surface, and appropriately disposed between the spray means, or the outer periphery of the spray means. An apparatus for forming a release agent coating film on the surface of a glass plate, characterized in that it comprises a hot air blowing means arranged to cover or inside the inner circumference.