JP2515907B2 - Painting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coating facility provided with a flash-off zone for evaporating water and a solvent from a coating film of a coating material formed on the surface of a coating object.

[Conventional technology]

When performing spray coating of a low-viscosity water-based paint in the coating food, as described in JP-B-52-30170, the spray zone and the flash-off zone are alternately provided, and the spray step and the flash-off step are performed several times. By repeating the above process, the water-based paint is applied repeatedly while preventing the flow and sagging of the paint to obtain the desired coating film thickness.

In addition, a flash-off zone is also provided between the coating booth and the drying furnace to prevent the coating film baked in the drying furnace from suffering coating film defects such as cracks.

[Problems to be Solved by the Invention]

This flash-off zone evaporates water and solvent in the coating film by blowing hot air of 40 to 90 ° C onto the coating object or by heating the coating object with the radiation emitted from the radiation heating plate. However, in the case of hot air, dust and dirt contained in the hot air may adhere to the coating surface and impair the coating quality. However, there is a possibility that the dried state of the coating film may become non-uniform due to uneven heating of the coated object, causing partial sagging or cracking.

Incidentally, in JP-A-52-98748, in the coating booth,
Alternatively, by forming a warm air curtain of clean air-conditioned air between the coating booth and the drying oven, it is possible to remove dust and dirt from the coating surface of the object to be coated without causing dust or dirt to adhere to the surface. Although a flash-off zone for evaporating water and solvent is also described, in this case, the conditioned air that forms the air curtain of warm air has a wind speed of 1 to 6 m / sec and a temperature of 30 to 60 m.
Since the temperature is ℃ and the humidity is 50% RH or less, the wind speed is almost all over the painting booth from the plenum chamber through the filter.
Another air conditioner is required separately from the air conditioner (see Japanese Patent Laid-Open No. 62-68566) that introduces air-conditioned air of 0.2 to 0.5 m / sec, a temperature of around 25 ° C., and a humidity of 70 to 80% RH. Therefore, there is a problem that the equipment cost increases and it becomes very difficult to adjust the supply / exhaust balance in the coating booth.

Therefore, the present invention makes it possible to obtain hot air composed of clean air that does not contain dust and dust without adding an expensive air conditioner, and even if the hot air is introduced into the flash-off zone, the coating booth The technical issue is to prevent the supply / exhaust balance of the vehicle from being upset.

[Means for solving the problem]

In order to solve this problem, the present invention is provided with a flash-off zone for blowing water or solvent from the coating film by blowing warm air onto the coating film of the coating material formed on the surface of the coating object. In a coating facility, a suction duct that sucks a portion of the clean air introduced from the plenum chamber through the filter into the coating booth under the filter and sends it to the heating device, and the clean air heated to the required temperature by the heating device. A discharge duct for introducing into the flash-off zone is provided.

[Action]

According to the present invention, part of the clean air introduced into the coating booth from the plenum chamber through the filter becomes hot air of the required temperature and is introduced into the flash-off zone. There is no risk of disturbing the supply / exhaust balance inside.

Also, since the warm air does not contain dust or dirt,
There is no risk of impairing the coating quality.

Furthermore, since the warm air is obtained by heating the clean air introduced into the coating booth from the plenum chamber with the heating device, the warm air is supplied to the flash-off zone separately from the air conditioning device that supplies the conditioned air to the plenum chamber. There is no need to provide an air conditioner for supply, and equipment costs are reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a front view showing an example of coating equipment according to the present invention,
FIG. 2 is a side view thereof.

In this example, there is shown a coating facility in which a flash-off zone F is provided in a tunnel-shaped coating booth 1 in which water-based coating is repeatedly applied, and an air supply fan 3 of an air conditioner 2 is used in a dynamic pressure chamber 4a of a plenum chamber 4. The conditioned air supplied to
It is uniformly introduced into the static pressure chamber 4b through the rectifying filter 5,
The conditioned air introduced into the static pressure chamber 4b becomes clean air dedusted through the filter 6 and is introduced into the flash-off zone F in the coating booth 1 and the spray zones provided before and after it at a predetermined wind speed. It is like this.

Then, the clean air introduced into the coating booth 1 is sucked into the mist treatment chamber 7 under the floor together with the paint mist generated in the spray zone, and the venturi device 8 provided in the mist treatment chamber 7 removes the paint mist and the like. After the removal, the exhaust fan 9 is configured to discharge the gas to the outside.

Further, in the flash-off zone F, a suction duct 10 for sucking the clean air introduced into the coating booth 1 through the filter 6 and a gate-shaped temperature through which the object W to be coated which is carried on the conveyor carriage 11 passes. An air blowing chamber 12 is provided.

The suction duct 10 has a suction port opened below the filter 6, and a blower 13 installed outside the coating booth 1.
Connected to the suction side of the cleaning device, sucks the clean air introduced into the flash-off zone F in the coating booth 1 through the filter 6, and heats the clean air between the suction duct 10 and the blower 13. It is supposed to be sent to 14.

The clean air heated to the required temperature by the heating device 14 is introduced into the warm air blowing chamber 12 through the discharge duct 15 connected to the discharge side of the blower 13 so that the object W to be coated is surrounded by the chamber 12. A plurality of discharge nozzles 16 and 16 provided
It is supposed to be blown out from.

The heating device 14 uses an erotic fin heater 17 that emits heat of steam, and a valve 18 that supplies steam to the erotic fin heater 17 is provided with a hot air introduced into the flash-off zone F from the discharge duct 15. Opening / closing control is performed by a temperature detection signal output from a temperature sensor 19 that detects temperature, and the temperature of warm air is optimally controlled.

The blower 13 is, for example, a gate-shaped warm air blowing chamber.
Depending on the size of the coating object W passing through 12, the discharge nozzle 1
Inverter motor 20 variably controls the number of revolutions of the inverter motor 20 in order to optimally adjust the volume and velocity of the warm air blown out from 6, 16.

Then, the clean air introduced from the plenum chamber 4 into the flash-off zone F in the coating booth 1 through the filter 6 is sucked into the suction duct 10 arranged below the filter 6 to the outside of the coating booth 1. The air is sent to the heating device 14 provided and heated by the heat emitted from the erotic fin heater 17 of the heating device 14 to become hot air of 50 to 60 ° C. It is introduced into the warm air blowing chamber 12 provided in the flash-off zone F, and is sprayed toward the article W from the discharge nozzles 16, 16 ... Of the chamber 12.

As a result, the water and solvent are evaporated from the coating film of the water-based paint formed on the surface of the article W to prevent the flow and sagging of the paint.

Further, the warm air blown onto the surface of the object W to be coated is obtained by heating the clean air introduced into the coating booth 1 from the plenum chamber 4 through the filter 6, and therefore, the air supply fan 3 and the exhaust fan. Painting booth 1 adjusted by 9
There is no risk of disturbing the supply / exhaust balance inside, and equipment costs are also reduced.

Further, the warm air does not contain dust or dust, and there is no fear of impairing the coating quality of the article W to be coated.

Further, as in the embodiment, when the erotic fin heater 17 that releases the heat of the steam is used as the heating device 14 for the warm air, explosion-proof measures are unnecessary and the equipment cost is further reduced.

The flash-off zone F is not limited to the one provided between the spray zones in the coating booth 1, but may be the coating booth 1
It is also included that is provided between the dryer and the drying oven.

Also, through the discharge duct 15, the flash-off zone F
The hot air to be introduced into is not limited to the case where it is blown out from the discharge nozzles 16, 16 of the warm air blowing chamber 12 provided so as to surround the article W, but the hot air is introduced from the hood provided above the article W. It may be blown downward.

〔The invention's effect〕

As described above, according to the present invention, the hot air that is introduced into the flash-off zone to evaporate water and solvent from the coating film of the object to be coated is introduced into the coating booth through the filter from the plenum chamber. Since it is obtained by heating air, even if it is sprayed on the object to be coated, there is no risk that dust or dirt will adhere to the coating surface of the object to be coated and impair the coating quality.

Also, if hot air obtained by heating the clean air introduced into the coating booth from the plenum chamber is introduced into the flash-off zone of the coating booth, there is no risk of disturbing the supply / exhaust balance of the coating booth.

Further, since it is not necessary to provide an air conditioner separate from the air conditioner for supplying the conditioned air to the plenum chamber in order to obtain the warm air, the facility cost is also reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an example of coating equipment according to the present invention, and FIG. 2 is a side view thereof. Explanation of symbols 1 ... Painting booth, F ... Flash-off zone, 4 ... Plenum chamber, 6 ... Filter, 10 ... Suction duct, 14 ... Heating device, 15 ... Discharge duct, W ... Coating Stuff.

Claims (1)

(57) [Claims] 1. A coating facility provided with a flash-off zone (F) for blowing hot air onto the coating film of the coating material formed on the surface of the coating material (W) to evaporate water and solvent from the coating film. In the suction duct (,), a part of the clean air introduced into the coating booth (1) from the plenum chamber (4) through the filter (6) is sucked under the filter (6) and sent to the heating device (14). 10) and its heating device (1
A coating facility characterized in that a discharge duct (15) for introducing the clean air heated to the required temperature in 4) into the flash-off zone (F) is arranged.