JP3084809B2 - Spray application equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray coating apparatus used for forming a surface coating such as an antistatic film and an antiglare film on a panel surface of a cathode ray tube.

[0002]

2. Description of the Related Art In a cathode ray tube, a coating film having an anti-glare effect (a so-called anti-glare film) is formed on the panel surface in order to prevent glare (surface glare) due to reflected light of external light. In addition, an antistatic film is formed on a panel surface to prevent the electron beam from being charged. These antiglare film and antistatic film can be formed by using, for example, a spray coating device.

[0003] A spray coating apparatus is generally provided with a support base for placing and supporting an object to be coated in a spray coating chamber, and a robot having a nozzle at a tip end facing the object to be coated. It is configured to scan the nozzle and spray the coating liquid from the nozzle onto the surface to be coated.

[0004]

When a coating film such as an antiglare film and an antistatic film is formed on the panel surface of a cathode ray tube using a spray coating device, a plurality of sprays are required to complete the coating within a required time. It is conceivable to provide a nozzle and scan a plurality of nozzles simultaneously. In this case, it is necessary to stably emit a constant amount of the coating liquid from each nozzle in order to perform spray coating evenly and uniformly.

The present invention has been made in view of the above points, and in a spray coating apparatus for uniformly coating with a plurality of nozzles, the amount of coating liquid emitted from each nozzle is stabilized to form a uniform coating film. A spray coating device is provided.

[0006]

According to the present invention, a coating is performed on a vertical coating surface through a plurality of nozzles 31A, 31B, 31C so that the coating ranges from the nozzles 31A, 31B, 31C partially overlap. In the spray coating apparatus, a plurality of coating liquid storage sections 32A, 32B, 32C corresponding to the nozzles 31A, 31B, 31C are integrally arranged in a stepwise manner, and each of the nozzles 31A, 31B, 31C and the coating liquid surface 6a are arranged.
The heights H _A , H _B , and H _C between them are set to be identical to each other.

[0007]

In the present invention, each of the nozzles 31A, 31B,
A plurality of application liquid storage sections 32A, 32B corresponding to 31C,
32C are integrally arranged in a stepwise manner, and each nozzle 31A, 31
By setting the heights H _A , H _B , and H _C between the nozzles B, 31C and the coating liquid surface 6a to be the same, the nozzles 31A, 31
B, 31C become the same, and each nozzle 31
A, the amount of coating liquid emitted from 31B, 31C is stabilized,
A uniform coating film can be formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a spray coating apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a spray coating apparatus 1 according to this embodiment.
FIG. 2 shows the main part, that is, the nozzle block section 7. The spray coating apparatus 1 has a substantially sealed spray coating chamber 2 in which a cathode ray tube 3 with an explosion-proof band, which is completed in a normal process, has a panel 4 whose surface is vertical. And a robot 8 having a nozzle block 7 for ejecting a coating liquid 6 at the end thereof. Nozzle block 7
The robot 8 scans the surface of the panel 4 arranged vertically by the robot 8 horizontally and vertically.

An air conditioner 17 for controlling the temperature, humidity and the like in the coating chamber 2 is provided, and clean air 19 whose temperature and humidity are controlled through an air-conditioning outlet 16 provided with an air filter. It is introduced into the coating chamber 2. Further, a movable hood 18 is disposed so as to cover the cathode ray tube 3, and clean air 19 from the air conditioner 17 is supplied to the panel 4.
After being supplied to the surface of the
Allows for more exhaust.

Further, in order to prevent dust from rising in the coating chamber 2, a water-containing member 9 such as a sponge connected to a water supply means 10 may be disposed inside the coating chamber 2. More specifically, the water-containing member 9 has a water supply pipe 12 disposed in a sponge wall 11, and water is supplied to the sponge wall through the water supply pipe 12. The water-containing member 9 causes dust in the coating chamber 2 to adhere, and prevents dust from entering during spray coating. 14 is a drain port.

On the other hand, as shown in FIG. 2, a plurality of, in this embodiment, three nozzle blocks 31 [31A, 31A,
31B, 31C] and each nozzle body 31A, 31B, 3
The coating liquid storage section 32 [3] for supplying the coating liquid 6 to 1C.
2A, 32B, 32C]. 31a, 31b and 31c are nozzle ports.
The nozzle bodies 31A, 31B, 31C are arranged at equal intervals obliquely with respect to the horizontal scanning direction a so that the nozzle bodies 31A, 31B, 31C have different positions in the vertical direction but do not interfere with each other. In this case, the application areas of the application liquid 6 emitted from the nozzle bodies 31A, 31B, and 31C are arranged in a positional relationship such that they partially overlap each other. That is, when the coating liquid 6 is ejected while scanning the nozzle block 7 in the horizontal direction a, as shown in FIG.
The coating film 35 is uniformly formed with a predetermined width W in the vertical direction so that B and 34C partially overlap.

Then, each nozzle body 3 of the auxiliary tank 33
1A, 31B, and 31C corresponding to the application liquid storage sections 32A,
32B and 32C are arranged in steps according to the steps of the nozzle main bodies 31A, 31B and 31C, and the respective coating liquid storage sections 32 are provided.
Nozzle port 3 corresponding to liquid level 6a of A, 32B, 32C
1a, the height H _A between 31b and 31c, so as to equalize the H _B and H _C, each coating liquid containing portion 32A, outlet 36A at the same height position in 32B and 32C, 36B and 3
6C is provided.

That is, the coating liquid 6 is supplied from the main tank (not shown) to the first coating liquid storage section 32A through the liquid supply pipe 37. A discharge port 36A is provided in the first coating liquid storage section 32A.
Is filled, the coating liquid 6 is discharged through the outlet 36A.
Is supplied to the second coating liquid storage section 32B, and when the second coating liquid storage section 32B is filled, the third
Of the liquid supply pipe 3 through the outlet 36C when the third coating liquid storage section 32C is filled.
From 8, the liquid is returned to the main tank (not shown).
In this manner, the heights H _A , H _B , and H _C between each nozzle body 31 and the liquid level 6a of each storage portion 32 of the auxiliary tank 33 can be made constant. The coating liquid 6 in each of the storage sections 32A, 32B and 32C is supplied to the conduit 39.
A, corresponding nozzle body 31 through 39B and 39C
A, 31B and 31C.

According to this configuration, the auxiliary tank 33 in which the coating liquid storage sections 32A, 32B and 32C are integrated with the three nozzle bodies 31A, 31B and 31C arranged obliquely is provided. Mouth 31a, 31b
And 31c and the coating liquid surface 6a of each of the storage sections 32A, 32B and 32C have the same height H _A , H _B , H _C , so that the emission pressures from the nozzle bodies 31A, 31B and 31C are equalized. be able to. Accordingly, the amount of the coating liquid emitted from each of the nozzle bodies 31A, 31B, and 31C is stabilized, and a uniform coating film 35 having a predetermined width W and having no coating unevenness can be formed.

On the other hand, when the coating film 35 is formed on the surface of the panel 4 by scanning the nozzle block portion 7, if the coating film 35 is applied with a locus 41 as shown in FIG. When the second-stage coating film 62 is applied, the drying speed of the overlapping portion 42 is slower than the others, as shown in FIG. 8, and as a result, the quality of the coating film 6 is deteriorated due to uneven coating or the like.

FIG. 4 shows an embodiment for improving this point. In this example, as shown by a locus 44 in FIG. 4, the nozzle body 31 is horizontally scanned, for example, from the upper left end of the surface of the panel 4, and when the first stage is applied, the nozzle body 31 is scanned vertically downward. The third stage is scanned from the right end to the left end, and then the nozzle main body 31 is scanned in a zigzag manner from the upper side to the lower side in the same manner as described above for each stage, and the next step is applied. In such a manner, scanning is performed in a zigzag manner from the lower side to the upper side.

At this time, the coating films 61 to 6n of each adjacent step
Is applied so as to partially overlap. By applying with the nozzle scanning locus 44, the next coating film 62 is formed so as to partially overlap the sufficiently dried coating film 61, and as shown in FIG. Drying unevenness is reduced, and a coating film 6 having uniform quality over the entire surface can be formed.

Next, FIG.
An example in which a two-layer antiglare film 51 having a visible light absorbing film 51a containing a black dye and an antistatic film 51b containing an inorganic metal compound on the surface of the panel 4 of the cathode ray tube 3 will be described.

The cathode ray tube 3 completed by the usual process is put into the spray coating chamber 2 with its panel 4 set at a predetermined temperature. And, the ethyl silicate solution containing SiO ₂ component 110 wt.% Of a black color dye 0.1-0.5% and a light scattering, panel 4 surface with a spray rate of 0.2 to 0.5 / sec To the visible light absorbing film 51
a is formed.

Further, a powder of a metal oxide such as tin oxide or indium oxide as a conductive agent is added in a solid content of 40 to 60 watts.
An ethyl silicate solution containing 1% to 10% by weight of SiO ₂ component is sprayed on the visible light absorbing film 51a at a spray flow rate of 0.2 to 0.5 ml / sec to form the antistatic film 51b.

Thereafter, at a temperature of 150 to 200 ° C., 10 to 3
By baking for 0 minutes, the antiglare film 51 having a two- layer structure is completed.

In applying the visible light absorbing film 51a and the antistatic film 51b, the panel temperature is set to 100 ° C. or less, preferably about 45 ° C., and the humidity in the coating chamber 2 is set to 50 to 6 ° C.
If the temperature is set to 0% and the temperature is set to 25 ± 5 ° C., the anti-glare film 51 having a high anti-glare effect is formed. Further, the panel temperature was set to about 30 ° C., the humidity in the coating chamber 2 was set to 70 ± 10%, and the temperature was set to 25 ± 10%.
If the temperature is set to 5 ° C., the antiglare effect is reduced, and the antiglare film 51 having a high glossiness, that is, a gloss value of 80 or more can be formed.

In the above example, the present invention is applied to the formation of the antiglare film 51 having a two-layer structure. However, the present invention can be applied to the formation of another coating film such as a single antistatic film or an antiglare film. Further, the present invention is not limited to the coating film on the panel surface of the cathode ray tube, and can be applied to the case of forming other coating films.

[0025]

According to the present invention, it is possible to stabilize the amount of the coating liquid from each nozzle when performing spray coating on a vertical surface to be coated through a plurality of nozzles so that the respective coating areas partially overlap. And a high quality coating film can be formed within a predetermined time. Therefore, the present invention can be suitably applied to, for example, a case where an antistatic film, an antiglare film, or the like is spray-coated on the panel surface of a cathode ray tube.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an example of a spray coating device according to the present invention.

FIG. 2 is a configuration diagram of a main part of the spray coating apparatus according to the present invention.

FIG. 3 is an explanatory view showing an example of a coating state according to the present invention.

FIG. 4 is an explanatory diagram illustrating an example of a coating locus of a nozzle according to the present invention.

FIG. 5 is a sectional view of a coating state according to the present invention.

FIG. 6 is a side view showing a partial cross section of a cathode ray tube having an antiglare film formed by the apparatus of the present invention.

FIG. 7 is an explanatory diagram showing a coating locus of a nozzle according to a comparative example.

FIG. 8 is a cross-sectional view of a coating state according to a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spray coating device 2 Spray coating room 3 Cathode ray tube 4 Panel 5 Support base 6 Coating liquid 6a Liquid surface 7 Nozzle block part 8 Robot 31A, 31B, 31C Nozzle main body 31a, 31b, 31c Nozzle port 32A, 32B, 32C Coating liquid storage Parts 41, 44 Application locus of nozzle

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 63-39451 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05B 15/06 B05B 7/24-7 / 32 B05C 11/10

Claims (1)

(57) [Claims] 1. A spray coating apparatus for coating a vertical surface to be coated with a plurality of nozzles through a plurality of nozzles such that the coating ranges from the respective nozzles partially overlap, wherein a plurality of coating liquid storages corresponding to the respective nozzles are stored. A spray coating apparatus in which the portions are integrally arranged in a stepwise manner, and the heights between the nozzles and the coating liquid surface are set to be equal to each other.