JP2610561B2 - Apparatus and method for coating curtain in clean room - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for coating a curtain in a clean room having a steel plate as an object to be coated.

[0002]

2. Description of the Related Art Conventionally, in a curtain coating apparatus in which a paint is freely dropped in the form of a curtain from above a running object to be painted, the interior of the curtain coating apparatus is made to have a clean room. From the necessity, as shown in Japanese Utility Model Laid-Open No. 3-102276 shown in FIG. 2, a ventilation inlet 15 is provided above the object 2 to be coated and a ventilation outlet 14 is provided below the cleaner 2 in the clean room 10.
Ventilation flow is applied in parallel with paint curtain 7, and clean
The air flow inside and outside the system 10 is separated and the object 2 is cleaned.
An apparatus has been proposed in which an airflow outlet 13 is provided in the room 10 and the run-out port 12 to oppose the inflow outside airflow, and the inflow of the outside airflow into the cleanroom 10 is blocked. According to this, the coating can be shielded by an airflow that opposes an external airflow that is going to flow in from the running port and the running exit of the workpiece 2, and the paint curtain can be held from an external airflow such as a running wind.

Further, by flowing a ventilation flow to an air supply port above an exhaust port, that is, by flowing a ventilation flow in parallel with a paint curtain that freely falls in the direction of gravity.
Prevents paint curtain disturbance due to ventilation flow. In addition, since the entrance and exit of the clean room can be substantially sealed by the airflow against the inflow outside air, the clean room can be cleaned.
Since only a small volume of the ventilation system needs to be ventilated, the ventilation efficiency can be remarkably increased, which has been achieved to some extent.

[0004]

SUMMARY OF THE INVENTION
No. 02276 discloses a seal in a clean room.
However, when a worker enters the clean room, for example, a wind speed of 0.2 m / sec or more, which is the minimum standard wind speed which is an environmental standard for organic matter in the room, is required. At this wind speed, there is a problem that the paint curtain in the clean room is disturbed, and this disturbance cannot be suppressed. The present invention solves these problems, enhances the ventilation effect, and prevents the generation of an air current that disturbs the paint curtain, while providing a wind speed higher than the minimum reference average wind speed of 0.2 m / sec. An object of the present invention is to provide a ten coating apparatus and a method thereof.

[0005]

DISCLOSURE OF THE INVENTION The present invention advantageously solves the problems of the prior art. As a result of the inventors' intensive efforts to achieve the above object, the ventilation efficiency in a clean room has been improved. And a minimum standard average wind speed of 0.2 m / s while preventing airflow that disturbs the paint curtain
The gist of the present invention is as follows. (1) In a curtain coating device in a clean room, the curtain coating device is switched on the left and right of the upper part of the clean room.
Air supply port for air supply and air supply port for clean room ventilation are provided respectively.
On the other hand, on the left and right of the bottom of the clean room, curtain coating equipment
Air outlets for ventilation of the room and
And a wind speed control damper at each exhaust port.
A curtain coating apparatus in a clean room, wherein a gas flow velocity around the curtain coating apparatus is reduced. (2) The apparatus according to (1 ), wherein the average supply air velocity to the curtain coating apparatus is less than 0.2 m / sec and the average supply air velocity to the surroundings is 0.2 m / sec or more. Curtain coating method in a clean room.

[0006]

The present invention will be described below in detail with reference to the drawings.
FIG. 1 is a side view showing the entire curtain coating apparatus according to the present invention. The curtain coating apparatus shown in FIG.
A doctor roll 3, a doctor roll 4, and a doctor blade 6. According to this, the paint 9 stored in the running port of the workpiece 2 is transferred from the gap between the paint roll 3 and the doctor roll 4 to the surface of the paint roll 3 by the rotation of the paint roll 3. It is discharged downward along. Reference numeral 6 denotes a blade arranged in the axial direction of the coating roll 3, which scrapes the coating from the surface of the coating roll 3 to form a coating curtain 7 and flows down.

[0007] In this way, the paint curtain 7 that has flowed down forms a coating film 8 above the workpiece 2. On the other hand, in order to separate the air flow inside and outside the clean room 10, the air outlet 13 for the air flow which opposes the inflow outside air flow is provided at the run-out port 12 of the workpiece 2 inside the clean room 10, Of the clean room 10 is blocked. That is, by blowing out an airflow that opposes the inflowing external airflow from the airflow port 11 provided at the running port 11 and the runout port 12 of the workpiece 2, the clean room 10 is protected against the outside air.
Can be substantially sealed, so that the paint curtain can be protected from an external airflow such as a running wind of the workpiece 2.

An exhaust port 1 for ventilation of a curtain coating unit.
An exhaust port 4 and a clean room ventilation outlet 17 are provided below the object to be coated in order to exhaust volatile substances such as solvents without causing dust to fly up in the coating environment. The ventilating air supply port 15 and the clean room ventilating air supply port 16 are provided for the ventilation outlets 14 and 17 to allow the ventilation flow in the clean room 10 to flow downward.
Provided above. However, as shown in FIG. 1, the position of the ventilation air supply ports 15 and 16 does not need to be limited to a position lower than the object 2 to be coated. It may be provided in the upper part of the inside. With such an arrangement, it becomes easier to cause the ventilation flow in the entire clean room 10 to flow downward.

In such a state, an air supply port 15 for ventilation of the curtain coating unit in the upper part of the curtain coating unit in the clean room 10 and an exhaust port for ventilation of the curtain coating unit in the lower part. 14 and the surrounding ceiling has a clean room.
An air supply port 16 for air ventilation, an exhaust port 17 for clean room ventilation on the lower floor, and dampers 18 and 19 for controlling wind speed are installed. In order to enable the work around the curtain coating apparatus, the average wind speed of the air supply port 16 and the exhaust port 17 is set to 0.2 m / sec or more specified in the organic matter environmental standard. Further, an air supply port 15 for ventilation of the curtain coating unit above and below the curtain coating unit and an exhaust port 14 for ventilation of the curtain coating unit.
Is 0.2 m / s to prevent disturbance of paint curtain.
ec.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When a coating is performed using a roller type curtain coating apparatus of the present invention shown in FIG. 1, a workpiece 2 such as a strip-shaped steel plate is moved in the direction of an arrow. The coating material 9 is allowed to fall freely in the form of a curtain 7 from between the coating roll 3 and the doctor roll 4 arranged above, and a coating film 8 is formed on the object 2 to be coated. Curtain coating equipment 1
In FIG. 1, a portion where the paint is exposed to the outside air is accommodated in a clean room 10.

The clean room 10 is provided with a running port 11 and a running port 12 for the workpiece 2 and an air flow outlet 13 provided at the running port 11 and the running port 12 for opposing the inflowing external air flow and a running position of the workpiece. A lower exhaust port 14 for ventilation of the coating apparatus and an exhaust port 17 for ventilation of the clean room, and an upper intake port 15 for ventilation of the coating apparatus and a clean room above the exhaust port. It has a ventilation air supply port 16 and is closed except for the openings. In the clean room 10, the ventilation flow is supplied from the air inlet 15 for the curtain coating unit and the air inlet 16 for the ventilation of the clean room to the exhaust port 14 for ventilation of the curtain unit and the screen. The air flows downwardly through the air outlet 17 for ventilation of the clean room, whereby the ventilation flow in the entire clean room 10 flows slowly downward.

In this case, the wind speed control dampers 18 and 19 are provided, and in order to enable the work around the curtain coating device, the average wind speed of the ventilation inlet 16 and the ventilation outlet 17 is as follows. At least 0.2 m / sec. The air supply port 15 and the exhaust port 14 above and below the curtain coating unit are set at less than 0.2 m / sec in order to prevent disturbance of the paint curtain. In particular, the reason why the average wind speed is 0.2 m / sec or more is that, for example, when a worker enters the clean room, the minimum standard average wind speed is 0.2 m / sec or more, which is an environmental standard for indoor organic matter. It is based on environmental standards that require However, at this wind speed, the paint curtain in the clean room is disturbed, and a uniform film thickness cannot be formed on the surface of the object to be coated. Therefore, it is necessary to suppress this disturbance. Therefore, in order to prevent the turbulence of the paint curtain, while maintaining the environmental standard in the clean room, the mean wind speed of 0.2 m / m without turbulence of the paint curtain is maintained.
Separate inlets and outlets less than sec were provided. In addition, the supply and exhaust ports having an average wind speed of less than 0.2 m / sec were arranged so as to be provided above and below the periphery of the curtain coating unit.

As a result, the environmental conditions in the entire clean room can be maintained at an average wind speed of 0.2 m / sec or more.
The minimum standard of the organic rules of workers in the room is secured, and the ventilation flow of curtain painting in the clean room flows downward. Stable cartoning was possible without disturbing the car at all. Further, by blowing out an airflow that opposes the inflowing external airflow from the discharge port 13 provided at the running port 11 and the runout port 12 of the workpiece 2, clean air is removed from the outside air.
Since the film can be substantially sealed, the paint curtain can be protected from an external airflow such as a running wind of the work 2 to be coated.

[0014]

As described above, the curtain coating apparatus according to the present invention can ensure the safety of workers while improving the ventilation efficiency, and does not disturb the paint curtain at all. Extremely stable curtain coating can be achieved, and a remarkable effect that coating with a uniform film thickness can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire curtain coating apparatus according to the present invention;

FIG. 2 is an overall side view of a conventional curtain coating apparatus.

[Explanation of symbols]

 Reference Signs List 1 curtain coating device, 2 objects to be coated, 3 coating rolls, 4 doctor rolls, 6 doctor blades, 7 paint curtains, 8 paint films, 9 paints, 10 clean rooms, 11 running outlets, 12 running outlets, 13 outlets, 14 curtains Ventilation outlet for coating unit, 15 Ventilation inlet for curtain coating unit, 16 Ventilation inlet for clean room, 17 Ventilation outlet for clean room, 18, 19 Wind speed control damper.

Claims (2)

(57) [Claims] 1. A curtain coating device in a clean room, wherein the left and right upper portions of the clean room are coated with curtains.
Air supply vents for equipment and clean room ventilation
Each is installed, while curtains are located on the left and right of the bottom of the clean room
Exhaust port for painting equipment ventilation and exhaust for clean room ventilation
While the arrangement of the mouth, the exhaust port by providing a wind speed control damper, a curtain coating device in a clean room, characterized in that to relieve the gas flow rate around the said a curtain coating apparatus. 2. The apparatus according to claim 1, wherein an average air supply air velocity to the curtain coating apparatus is less than 0.2 m / sec and an average air supply air velocity to the surroundings is 0.2 m / sec or more. A method for coating a curtain in a clean room.