JPH06142601A - Continuous baking method of coating - Google Patents

Abstract

PURPOSE:To provide a continuous baking method of coating by which a processed article of a good quality having a sanitary surface to which soot and dust are not adhering is obtained by using fresh air as a baking processing heat source, and moreover, hot air of a stable temperature required for a baking processing is obtained safely by a simple device. CONSTITUTION:Exhaust gas from a baking furnace 1 is led to an incinerator 3 and solvent evaporation gas in the gas is incinerated, and on the other hand, in a process for feeding fresh air to the baking furnace 1, its fresh air is converted to a high temperature by utilizing high temperature exhaust gas from the incinerator 3, and also, at the time supplying its fresh air into the baking furnace 1, it is regulated to a temperature required for baking by allowing a part of the fresh air converted to a temperature to pass through a cooler 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for carrying out a baking treatment of the treatment material in the baking oven in the process of passing the treatment material having the coating material applied thereto from one side to the other side of the continuous baking oven. It relates to a continuous printing method.

[0002]

2. Description of the Related Art As a heat source of hot air required for heat treatment in a baking furnace, a high temperature exhaust gas discharged from an incinerator as a facility for attaching combustion equipment to the furnace or incinerating exhaust gas of the baking furnace is used. There is a way. However, if combustion equipment is attached, the equipment cost will increase, and in addition, there is a problem that special consideration must be taken to prevent ignition of the evaporative gas of the solvent in the baking furnace. When they are added, since these contain soot and dust, these impurities adhere to the surface of the treated material and there is a problem that a hygienic baking treatment cannot be performed.

In order to solve the above problems, it has been considered that the fresh air is heated to a high temperature by the high-temperature exhaust gas of the incinerator and is used as the hot air for the heat treatment to carry out the paint continuous baking method.

[0004]

In this conventional method of continuous baking of paint, not only the temperature of the fresh air heated by the high-heat exhaust gas becomes extremely high, but there is a temperature fluctuation depending on the change of the baking state of the incinerator. There were many problems as a heat source for performing a high quality baking process.

The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art. By using fresh air as a heat source for baking treatment, a hygienic surface free from soot and dust can be obtained. It is an object of the present invention to provide a paint continuous baking method that can obtain a high-quality processed product and that can safely obtain hot air having a stable temperature required for baking with simple equipment.

[0006]

In order to achieve the above object, the paint continuous baking method according to the present invention is characterized in that in the process of passing a treated material having a paint attached thereto from one of the continuous baking furnaces toward the other, In a paint continuous baking method in which the above-mentioned treated material is baked by hot air in a baking oven, the exhaust gas from the baking oven is introduced into an incinerator to incinerate the solvent evaporative gas in the gas, while fresh air is transferred to the baking oven. In the process of sending air toward the temperature of the fresh air using the high-temperature exhaust gas from the incinerator and supplying the fresh air into the baking furnace, one of the heated fresh air is By passing the part through a cooler, the temperature required for the above-mentioned baking is adjusted.

[0007]

[Operation] The exhaust gas from the baking furnace is thermally burned by the incinerator. The fresh air is heated by the high-temperature exhaust gas from the incinerator. The fresh air, which has become high temperature, is put into a baking oven to perform baking treatment. In this case, if a part of the fresh air is cooled through a cooler, the fresh air entering the baking furnace will have a temperature suitable for the baking process.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, F1, F2, C1 and C2 indicate processing chambers in a known continuous baking furnace 1, F1 and F2 are evaporation zones, and C1 and C2 are baking zones. The furnace temperature is, for example, 200, 250, 300 in this order.
Maintained at 350 ° C. A strip-shaped processing material 2 (for example, a metal strip) wound on a reel 10 is pulled out from one side * 1 of the baking oven 1, and a coating material is applied in a coater chamber 11 on the way to proceed toward the inside of the baking oven. To be done. On the other hand, at * 2, the treated material 2 which has been subjected to the baking treatment in the baking oven is taken out and taken up by the take-up reel 12.

Next, reference numeral 16 denotes the exhaust gas from each processing chamber.
Shown are ducts for leading toward the incinerator 3 via ducts 18 to 18, and dampers 13 with a control electric motor CM are respectively provided in these ducts. Reference numerals 19 to 22 indicate a known thermocouple, flowmeter, blower, and exhaust gas preheating heat exchanger in this order.
In the incinerator 3, as is well known, the fuel gas and the air are supplied, the burner 14 is operated, and the inside of the incinerator 3 is, for example, 75
The solvent evaporative gas in the exhaust gas is incinerated at about 0 ° C. The high heat exhaust gas from the incinerator 3 is the heat exchanger 22,
It is discharged from the chimney 24 via the second heat exchanger 23. During this time, the heat exchanger 22 raises the exhaust gas by about 100 ° C, and the second heat exchanger 23 raises the air from the fresh air intake 25 to 400 ° C.
The high-temperature exhaust gas is heated to 600 ° C, 200
It is released in the order of ℃.

Fresh air is sent from the blower 26 to the duct 27 to
It is sent to each processing room via 29. The fresh air passing through the duct 29 has a relatively high temperature (for example, around 400 ° C.), but is adjusted to an appropriate temperature when entering each processing chamber. That is, the passage amount is adjusted by the concentration adjusting damper 33 with each control electric motor CM, the temperature indicating controller TIC, the thermocouple T / C, and the damper 34 controlled by the control electric motor CM operated by those instructions. By adjusting the partial flow rate toward the cooler 35, the temperature of the fresh air entering each processing chamber is adjusted to an individual set temperature.

In the figure, reference symbol LEL is a hydrocarbon gas concentration measuring device in each processing chamber, and signals from these are calculated by the exhaust air flow rate calculating means 31 for each zone to obtain L.E.L.
The adjustment instruction is given to each damper 33 so that the (explosion limit value) is set to the safety value of the 1 / 4th place. Further, the exhaust air is adjusted by interlocking the respective dampers 13, 13, 13, 13 provided in the duct 12. As a result, it is possible to prevent wasteful discharge of a large amount of exhaust gas from each processing chamber, so that the load on the incinerator 3 can be reduced. Along with this, the flow rate from the fresh air intake 25 is also controlled by operating the damper 37 using the flow meter 36 and the air amount controller FIC. Next, 30 shows a blower for circulating hot air attached to each processing chamber.

When the above-mentioned structure is utilized, in the process of passing the treatment material to which the coating material adheres from one side to the other side of the continuous baking furnace, the above-mentioned processing material is baked by hot air in the baking oven. In the paint continuous baking method, the exhaust gas from the baking furnace guides the incinerator to incinerate the solvent evaporative gas in the gas, while in the process of sending fresh air to the baking furnace, high-heat exhaust gas from the incinerator. In supplying the fresh air to the baking furnace while raising the temperature of the fresh air by utilizing, the temperature of the fresh air is raised by passing a part of the heated fresh air through a cooler. It can be adjusted.

[0013]

As described above, according to the present invention, since fresh air is heated and supplied to the baking furnace 1 to perform the baking process, soot and dust will not adhere to the processing material 2. There is an effect that a very hygienic baking process can be performed.

Further, since the fresh air is heated to a high temperature while collecting the high-temperature exhaust gas discharged from the incinerator 3, there is a feature that no special combustion equipment for producing the high-temperature gas required for the treatment in the baking furnace is required. This means that there is no kind of flame inside and outside the baking furnace, so even if an organic solvent is used as the paint, the LEL control of the baking furnace 1 is rough and easy to control. Naturally, gas leak detection is also unnecessary. In addition, the space required for installing the equipment is unnecessary, the equipment cost is unnecessary, and the maintenance is easy.

Further, in the present invention, even if the fresh air is heated by the high-temperature exhaust gas from the incinerator 3, the temperature required for the above-mentioned baking is obtained by passing a part of the fresh air whose temperature has risen through the cooler. Therefore, even if there is a change in the “amount” or “temperature” of the high-temperature exhaust gas from the incinerator 3, the temperature supplied to the baking furnace 1 becomes a preset correct temperature, and a high-quality baking process is performed. There is also an effect that can be. Further, since the temperature of the fresh air can be adjusted in the vicinity of the baking furnace 1 in the present invention, the temperature of the fresh air is raised in a safe place away from the baking furnace 1 (for example, near the incinerator 3). However, there is also a facility effect that fresh air can be transferred by a single duct 28 from there to the vicinity of the baking furnace 1.

[Brief description of drawings]

FIG. 1 is a layout view of an apparatus used in a method for continuously baking paint.

[Explanation of symbols]

 1 Baking Furnace 2 Treatment Material 3 Incinerator 23 Second Heat Exchanger 25 Fresh Air Intake 33 Concentration Control Damper 34 Damper 35 Cooler

Claims (1)

[Claims] 1. A method for continuously baking a coating material, wherein in the process of passing a treated material having a coating material applied thereto from one side to the other side of a continuous baking furnace, the treated material is baked by hot air in the baking furnace. While the exhaust gas from the baking furnace guides the incinerator to incinerate the solvent evaporation gas in the gas, in the process of sending fresh air to the baking furnace, the high-temperature exhaust gas from the incinerator is used to make the fresh gas. In supplying the fresh air into the baking furnace while raising the temperature of the air, the temperature of the fresh air is adjusted to a temperature necessary for the baking by passing a part of the heated fresh air through a cooler. A method for continuous baking of paint.