JPH02112B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an apparatus for forming a film of uniform thickness on the surface of an article such as a glass plate that moves at a constant speed. It is generally known that a glass plate having reflective or transmitting properties, such as heat ray reflective glass or wavelength selective glass, can be obtained by forming a film having various optical properties on the surface of the glass plate. For example, in the float method, a chemical liquid consisting of an organometallic compound and an organic solvent is sprayed onto a ribbon-shaped glass plate in a high temperature state sent from a tain bath, and the chemical liquid is decomposed by the temperature of the glass. can be obtained in an on-line spraying method that produces a metal oxide coating. Since the performance of this film is greatly influenced by its planar uniformity, the film is required to have extremely high planar uniformity. In particular, when spraying with several spray guns or when continuously spraying onto a continuously moving ribbon-shaped glass plate, the uniformity of the spray film becomes an important issue because overlapping of spray patterns occurs. As a prior art to solve these problems, Japanese Patent Publication No. 53-11015 discloses a method in which three spray guns are attached to one spray head and the overlapping of the spray patterns by the spray guns is limited, and one sprayer that can be freely oscillated. Japanese Patent Publication No. 52-31883, in which one spray gun is attached to the head and the distance of the spray gun from the glass plate is constant; There is a method such as Japanese Patent Application Laid-open No. 101015/1983 in which a spray gun is moved in a sinusoidal manner. However, none of the prior art disclosed to date has completely solved the above-mentioned problem.
This method has drawbacks such as the need to move the glass plate at a lower speed than usual, poor durability, and difficulty in controlling overlapping spray patterns. In view of the above-mentioned facts, the present invention provides an apparatus that can generate a uniform coating on the surface of an article such as a glass plate without reducing the production speed of the article. A plurality of spray guns are arranged in parallel in the width direction across the width direction so as to be reciprocally movable. The article is not particularly limited as long as it has a flat surface such as a plastic plate or a glass plate, but the present invention is particularly effective in forming a film on a ribbon-shaped glass plate. The spray gun preferably has a fan-shaped spray shape with an expanse of 90° to 110°, and the spray density has a normal distribution. When the spray shape is less than 90 degrees, the width of the spray pattern becomes narrower, and the spray patterns overlap less due to the reciprocating movement of the spray gun, resulting in less uniformity in the moving direction of the article. Furthermore, if the spray shape is 110° or more, a stable spray pattern cannot be obtained. The distance between the spray gun and the article surface is 250~350
mm is the most efficient, but is not particularly limited to this range. However, when a metal oxide film is generated by thermally decomposing a chemical solution as described above, when the thickness exceeds 350 mm, the strength of the film decreases due to the effects of thermal decomposition. The reciprocating speed of the spray gun is 2.5m/sec.
Below, preferably 2.0m/sec or less, especially 2.5m/sec
If it exceeds the range, the spray density distribution becomes wider than the normal distribution, making it impossible to obtain a uniform coating. In addition, the spray pattern of the spray gun on the surface of the article is approximately spindle-shaped, with an angle of 45° to 60° with respect to the reciprocating direction of the spray gun, and each spray pattern is approximately parallel to the other. If the angle is outside the above range, pattern irregularities at the joints between adjacent spray guns will become noticeable, which is not desirable. It is preferable that the period of the reciprocating motion of each spray gun is deviated by 1/2 rotation from the same period to avoid unevenness at the joint portion. An embodiment in which the present invention is applied to the above-mentioned online spray method will be described in detail below. To explain the online spraying method with reference to FIG. 1, a ribbon-shaped glass plate 1 is sent out from a stain bath 2 by a conveyor roll 3 and is transferred to an annealing oven 4 at a constant speed. Between the outlet of the stain bath 2 and the entrance of the slow cooling oven 4, a spray gun 5 that reciprocates on the top surface of the glass plate 1 in a direction transverse to the ribbon at right angles to the ribbon traveling direction;
5' is provided at a predetermined distance from the glass plate 1. A pair of exhaust pipes 7,
Suction ports 9 and 10 8 extend to the top surface of the glass plate 1
Leads to. The intermediate portions of the pair of air suction pipes 7, 8 are covered with metal plates 12, 13, leaving a slit 11 along the movement path of the spray guns 5, 5'. The metal covers 12 and 13 are connected to the upper portions of the suction ports 9 and 10 extending near the upper surface of the side portion of the glass plate, and constitute an integrated hood 6 that surrounds the spray atmosphere, thereby reducing the amount of water generated by the spray. It is designed to suck out decomposition gas, etc. Further, in order to be able to adjust the width of the slit 11 and the distance between the suction ports 9 and 10 extending to the surface of the glass plate, adjustment mechanisms such as sliding adjustment plates 14 and 15 are provided. . Next, a mechanism for reciprocating the spray guns 5, 5' will be described with reference to FIGS. 2 and 3. The spray guns 5, 5' are mounted on the I-shaped beam 16 so as to reciprocate in a range that roughly divides the width of the glass plate 1 into two. Since the mechanism is the same for the spray guns 5 and 5', the spray gun 5 will be explained below. Guide rails 17 and 18 are provided on the upper and lower surfaces of an I-shaped beam 16 that is mounted parallel to the side of the movement path of the spray gun 5, and the guide rails 17 and 1
A running head 21 having wheels 19, 20 which roll against the spray gun 8 is provided on which the spray gun 5 is mounted. Sprocket wheels 22 and 23 are pivotally supported on the side surfaces of the beam 16, and a roller chain 24 is stretched between the sprocket wheels 22 and 23.
A pulley 25 is inserted into the other end of the shaft of the sprocket wheel 22, and the pulley 25 is interlocked with a variable speed motor 26 provided on the I-shaped beam 16 and a belt 27. Further, a head drive pin 28 protruding laterally is fixed to the roller chain 24, and the pin 28 is inserted into a long hole 29 provided in the traveling head 21, thereby causing the roller chain 24 to rotate in one direction. is converted into a reciprocating motion of the traveling head 21. In addition, 30 is a pipe that sends the chemical solution to the spray gun 5, and 31
is its stop. The spray guns 5, 5' are reciprocated at the same speed and cycle by variable speed motors 26, 26' to spray the chemical onto the surface of the glass plate. As mentioned above, the speed at that time is 2.5 m/sec or less, and if the speed of the spray gun 5 exceeds 2.5 m/sec depending on the width of the glass plate 1 and the transfer speed, shorten the reciprocating distance of the spray gun 5. Then three or four spray guns are mounted on the beam 16. The spray patterns of the spray guns 5 and 5' are as shown in FIG.
The spray direction of the spray guns 5, 5' is determined so as to form an angle (α) of approximately 60° with respect to the reciprocating direction of the spray guns 5'. In addition, the arrow B in the figure indicates the advancing direction of the glass plate 1, and the arrow C indicates the direction of movement of the glass plate 1.
The range of reciprocating motion is shown. Furthermore, the spray guns 5 and 5' may be air spray (two-fluid type) or airless spray (one-fluid type), and by adjusting the liquid pressure or air pressure, the spray density distribution can have the normal distribution described above. can be obtained. Distance D between spray ranges of spray guns 5 and 5'
If the radius of the sprockets 23, 23' is r, then (π-2)r-150<D<(π-2)r+
A range of 150 mm is preferable, and it has been confirmed that outside this range the seam becomes darker or thinner. The I-type beam 16 is 1 as in the previous embodiment.
Spray guns 5 and 5' may be mounted on the book, but
Of course, each of the spray guns 5 and 5' may be provided with two beams. Further, the reciprocating mechanism of the spray guns 5, 5' is not limited to the embodiment, and may utilize, for example, a hydraulic cylinder or an air cylinder telescopic rod. Further, as for the type of liquid sprayed by the spray guns 5, 5', the above-mentioned chemical liquid consisting of an organometallic compound and an organic solvent is preferably used, but various surface treatment agents or general paints may be used depending on the purpose. Next, the test conditions and results for producing heat ray reflective glass using the apparatus of this example are shown in the table below.

[Table] As described above, in the present invention, the running range of individual guns and hoses is narrow, 1/2 or 1/3 of the entire spray range, so there is less wear and tear on these parts, and durability is greatly improved. It is possible to reduce the weight, and since the amount of spray blown out to one location in the hood is small, there is less scaling in the hood, the temperature drop on the surface of the article is small, and the coating strength is improved. In addition, the spreading direction of the spray patterns lined up with the spray guns is different, so there is no interference between patterns.
Therefore, it is possible to provide an excellent spray device that does not cause any unevenness at the seam portion.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing one embodiment of the present invention;
Figure 2 is its front view, Figure 3 is A in Figure 2.
~A sectional view, and FIG. 4 is a plan view showing the spray pattern. 1... Ribbon-shaped glass plate, 3... Conveyance roll,
5...Spray gun, 16...I type beam, 2
1, 21'... Travel head, 22, 22'... Sprocket foil, 23, 23'... Sprocket foil, 24... Roller chain, 26, 26'
...Variable speed motor.

Claims (1)

[Claims] 1. A plurality of spray guns each having a fan-shaped spray shape with a spread of 90° to 110° and whose spray density distribution is normally distributed are placed above an article moving at a constant speed. , are arranged in parallel so as to be able to reciprocate in the width direction transverse to the moving direction of the article, the spray patterns have an angle of 45° to 60° with respect to the moving direction of the spray gun, and each pattern is substantially parallel. A spray device characterized by: 2. The spray device according to claim 1, wherein the article is a ribbon-shaped glass plate. 3. The reciprocating speed of the spray gun is 2.5 m/sec.
A spray device according to claim 1, which is: