JPH08290092A - Apparatus for continuous coating of metal strip - Google Patents

Abstract

PURPOSE: To achieve cost reduction by decreasing fans to be provided in a continuous coating installation for a metal strip. CONSTITUTION: Seal rolls 8 and 9 are arranged on the inlet side and the outlet side of a cooling room 5 to perform sealing and the atmospheric gas (air) in the coating room 2 is fed to a cooling header 10 arranged in the cooling room 5 by using a connecting fan 7. A metal strip 1 is cooled with the air ejected from a nozzle formed on the top face of the cooling header 10. Without leaking the air blown into the cooling room 5, it is pushed into 2 vent duct 11 by utilizing the ejecting pressure of the connecting fun 7 and is exhausted outside. Three fans which have been conventionally necessary, namely, a ventillation fan for the cooling room 5, an air blowing fan to the metal strip 1 and an exhausting fan for the cooling room 5 can be reduced to only one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention continuously coats metal strips in a coating chamber installed on a coating line,
The present invention relates to a metal strip continuous coating facility in which a metal strip coated with a paint is dried by heating and then cooled in a cooling chamber.

[0002]

2. Description of the Related Art Generally, when a paint is applied to a metal strip, an organic solvent is often used. Therefore, it is necessary to seal the place where the organic solvent is treated and to ventilate the work environment. For example, as shown in FIG. 2, the metal strip 1 is guided to the coater 3 installed in the coating chamber 2 to continuously apply the paint to the metal strip 1, and then the drying chamber 4 is applied with the paint. Heat drying.
Further, normal temperature air is supplied from the cooling fan 13 to the cooling header 10 arranged in the cooling chamber 5, and the metal strip 1 on which the paint is heated and dried is supplied from a large number of nozzles (not shown) arranged on the upper surface of the cooling header 10. Cool by blowing air.

At this time, the high-concentration organic solvent vapor generated in the coating chamber 2 is treated to a low concentration by using an organic solvent treatment facility not shown in FIG. Atmosphere gas (mainly air) is applied to the coating chamber ventilation fan 12
Is used to ventilate outdoors. On the other hand, some paints in the cooling chamber 5 may also generate a lower concentration of solvent vapor than the surface of the metal strip 1 when the metal strip 1 is in a certain temperature range. Therefore, an air collecting hood 15 is arranged above the cooling chamber 5, and the low concentration solvent vapor collected by the air collecting hood 15 is discharged to the outside of the building through the exhaust duct 11 by operating the exhaust fan 14 together with the air. ing.

[0004]

According to the prior art as shown in FIG. 2, since the coating chamber 2 and the cooling chamber 5 are ventilated,
Moreover, in order to blow air to the metal strip 1 to cool it, three fans are required, and the equipment cost of the fan,
There has been a problem that operating costs and maintenance costs increase, resulting in high costs.

The present invention solves the above-mentioned problems of the prior art, and the ventilation of the coating chamber 2, the cooling of the metal strip in the cooling chamber 5 by the air, and the exhaust of the cooling chamber 5 can be performed by one fan. It is an object of the present invention to provide a continuous coating equipment for metal strips.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is to continuously apply a coating material to a metal strip in a coating chamber installed on a coating line and then heat the coated metal strip. In a continuous coating facility for metal strips that is dried and then cooled in a cooling chamber, a connecting duct that connects the coating chamber and the cooling chamber, a connecting fan disposed in the connecting duct, and a metal strip in the cooling chamber. A sealing mechanism provided at an inlet and an outlet through which the gas passes, and an exhaust duct provided in the cooling chamber, and guides the atmospheric gas in the coating chamber to the cooling chamber by using a connecting fan provided in the connecting duct. A metal strip passing through the cooling chamber is blown through a sealing mechanism provided at the inlet and the outlet of the cooling chamber to cool the strip and the atmospheric gas in the cooling chamber is pushed into an exhaust duct. A continuous painting equipment of the metal strip, characterized by being configured to discharge the outside the building in.

[0007]

[Function] The atmosphere gas in the coating chamber is guided to the cooling chamber by using the connecting fan arranged in the connecting duct, and the metal strip passing through the cooling chamber is sprayed and cooled, and the atmosphere gas in the cooling chamber is pushed into the exhaust duct. Since it ventilates outdoors, it suffices to install one connecting fan.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a system diagram showing a continuous coating facility for metal strips according to the present invention. In FIG. 1, the same parts as those in the conventional example shown in FIG.
As shown in FIG. 1, the metal strip 1 is guided to a coater 3 installed in a coating chamber 2 to continuously apply the coating to the metal strip 1, and then a drying chamber 4 heat-drys the coating applied to the metal strip 1. I do. Further, the cooling header 10 is arranged in the cooling chamber 5 from the connection duct 6 by using the connection fan 7.
Is supplied with ambient temperature air, which is the atmospheric gas in the coating chamber 2,
The paint is heated and dried to cool the metal strip 1 by blowing air upward from a large number of nozzles (not shown) arranged on the upper surface of the cooling header 10. The high-concentration organic solvent vapor generated in the coating chamber 2 is treated by using an organic solvent removing facility, though not shown, so that the organic solvent becomes low-concentration air as in the conventional example shown in FIG. Is.

According to the present invention, a pair of upper and lower inlet side seal rolls 8 and outlet side seal rolls 9 are arranged as a sealing mechanism in the cooling chamber 5 installed subsequent to the drying chamber 4, and the cooling chamber 5 is provided in the cooling chamber 5. It is designed to allow the metal strip 1 to pass through and to seal on its entry and exit sides. The coating chamber 2 and the cooling chamber 5 are connected by a connecting duct 6, and a connecting fan 7 is arranged in the connecting duct 6. An exhaust duct 11 is provided in the cooling chamber 5 and opens to the outside. The sealing mechanism provided on the inlet side and the outlet side of the cooling chamber 5 is not limited to the seal roll, but a sealing mechanism such as a rubber curtain or a labyrinth seal can be used, and a similar sealing action can be obtained.

As shown in FIG. 1, the metal strip 1 is guided to a coater 3 installed in a coating chamber 2 to continuously apply the coating to the metal strip 1, and then the coating applied to the metal strip 1 in a drying chamber 4. The heating and drying is performed as described above. In the present invention, the atmospheric gas (mainly air at normal temperature) after the high-concentration organic solvent vapor generated in the coating chamber 2 is treated in the treatment facility is cooled by operating the connecting fan 7 through the connecting duct 6. The metal strip 1 which is guided to the header 10 and passes through the inside of the cooling chamber 5 by blowing air from a large number of nozzles arranged on the upper surface of the cooling header 10.
To cool.

At this time, the metal strip 1 guided into the cooling chamber 5 has an inlet side seal roll 8 and an outlet side seal roll 9
Since it passes through the exhaust pipe 11, the air pressurized by the operation of the connecting fan 7 and blown from the nozzle of the cooling header 10 is pushed into the exhaust duct 11 without leaking together with the low-concentration solvent vapor generated in the cooling chamber 5. It will be discharged outside the building. Here, the connection fan 7 needs to be arranged in the middle of the connection duct 6 that connects the coating chamber 2 and the cooling chamber 5. This is because when cooling the metal strip 1, it is necessary to blow air from the nozzle of the cooling header 10 onto the metal strip 1 in order to ensure the thermal conductivity.

When a steel strip is continuously coated with an ink diluted with an organic solvent as a paint by using the continuous coating facility according to the present invention, and is dried by heating, a connecting duct, a cooling header and an exhaust duct are used. Even considering the pressure loss of the steel strip, it was possible to sufficiently cool the steel strip with one 30 kw connecting fan. On the other hand, when a steel strip is continuously coated with ink diluted with an organic solvent as a paint using the continuous coating equipment according to the conventional example shown in FIG. Ventilation fan 20kw, cooling fan 20kw and exhaust fan 25kw each fan motor 3
A total of 65kw was required on the stand.

As described above, according to the present invention, it is possible to reduce the number of fans from one to three, which was required in the prior art. As a result, in the present invention, the equipment cost is 1/3 and the operation cost is 1 as compared with the conventional one.
/ 3 and maintenance cost 1/3 can be achieved. The present invention is also applicable to coating equipment for non-ferrous metal strips such as copper and aluminum other than steel strips.

[0014]

As described above, according to the present invention, the inlet side and the outlet side of the cooling chamber are sealed by using the sealing mechanism, the coating chamber is ventilated, the metal strip is cooled by air, and the cooling chamber is exhausted. Can be performed by one fan. As a result, the construction cost, operating cost and maintenance cost of the continuous coating facility can be reduced, and the effect is great.

[Brief description of drawings]

FIG. 1 is a system diagram showing a continuous coating facility for metal strips according to the present invention.

FIG. 2 is a system diagram showing a continuous coating facility for metal strips according to a conventional example.

[Explanation of symbols]

 1 Metal Strip 2 Coating Room 3 Coater 4 Drying Room 5 Cooling Room 6 Connecting Duct 7 Connecting Fan 8 Incoming Seal Roll 9 Outgoing Seal Roll 10 Cooling Header 11 Exhaust Duct 12 Coating Room Ventilation Fan 13 Cooling Fan 14 Exhaust Fan 15 Air Collection hood

Claims (1)

[Claims] 1. A continuous coating of a metal strip in which a metal strip is continuously coated with a coating material in a coating chamber installed on a coating line, the coated metal strip is heated and dried, and then cooled in a cooling chamber. In the facility, a connecting duct connecting the coating chamber and the cooling chamber, a connecting fan arranged in the connecting duct, and a sealing mechanism provided on an inlet side and an outlet side through which the metal strip passes through the cooling chamber, An exhaust duct provided in the cooling chamber is provided, and atmospheric gas in the coating chamber is guided to the cooling chamber by using a connecting fan provided in the connecting duct, and a sealing mechanism provided at an inlet and an outlet of the cooling chamber is used. It is configured such that the metal strip passing through the cooling chamber is sprayed and cooled, and the atmospheric gas in the cooling chamber is pushed into the exhaust duct and discharged outside the building. Continuous coating equipment for metal strips.