JPH02298385A - Resin drying method of sandwich type resin composite metal plate - Google Patents

Abstract

PURPOSE:To prevent a lowering of heat efficiency by supplying a gaseous mixture of radiant tube combustion exhaust gas and air into a resin drying oven. CONSTITUTION:The combustion exhaust gas of the radiant tube 2 of a drying oven 1 is stirred along with the air from the duct 8 engaged with the conduit 7 connected to a suction port 6 to be supplied into the oven 1 as the gaseous mixture with air through the conduit 7. A lowering of oven temp. is suppressed by the supply of this gaseous mixture and the dilution of solvent evaporation gas is performed by the drying of the solvent type resin 4 applied to the surface of a metal plate 3. The temp. of the combustion exhaust gas of the radiant tube is about 700 deg.C and explosion can be prevented while lowering of oven temp. is suppressed and the quality of a composite metal plate can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a resin drying method for a sandwich-type resin composite metal plate.

(Prior art and its problem a) In manufacturing sandwich-type resin composite metal plates, the surface of one metal plate (strip) is coated with a so-called solvent-based resin containing volatile solvents such as toluene and xylene. After the resin is introduced into a drying oven and dried to remove the solvent in the resin, the other metal plate (strip) is placed on the resin surface and pressurized to form a sandwich-type resin composite metal plate (Tokuko Showa). 62-58897).

However, when drying the resin, as shown in Figure 1,
Fuel gas and air are introduced into the radiant tube 2.2a placed in the drying oven 1, and are burned to indirectly heat the inside of the oven 1, and the solvent-based resin 4 applied to the surface of the metal plate (strip) 3 is heated. During drying, the furnace 1 is filled with solvent (toluene, xylene, etc.) and there is a risk of explosion, so the gas inside the furnace is sucked and discharged from the suction port 5 of the furnace 1, Air is sucked into the furnace 1 to dilute the solvent filling the furnace and prevent explosions.

As a result, the temperature inside the furnace 1 decreases, and the amount of fuel gas in the radiant tube 2.2a increases in order to maintain the predetermined furnace temperature, which significantly reduces thermal efficiency and increases costs. However, there are some drawbacks such as:

(Problem B to be Solved by the Invention) The present invention has been made to advantageously solve these drawbacks.

(Means for solving the If!i! problem) The gist of the present invention is that when manufacturing a sandwich-type resin composite metal plate, a solvent-based resin applied to the surface of one metal plate (strip) is A resin drying method for a sandwich-type resin composite metal plate, characterized in that during drying in a resin drying oven equipped with radiant tubes, a mixed gas of radiant tube combustion exhaust gas and air is supplied into the resin drying oven. .

In the present invention, as described above, a mixed gas of high-temperature gas, which is the combustion exhaust gas of the radiant tube, and air is introduced into the furnace to dilute the solvent evaporation gas in the furnace while suppressing a decrease in the temperature inside the furnace. It is something. In other words, the drying temperature of resin is generally about 200°C, while the combustion exhaust gas of the radiant tube is about 700°C, and by mixing this with air and introducing it into the furnace, the furnace temperature can be sufficiently lowered. It is possible to prevent explosions while suppressing them.

Next, an example of an embodiment of the present invention will be explained with reference to FIG.

In FIG. 2, the combustion exhaust gas from the radiant tube 2 of the drying oven 1 is inhaled through the conduit 7 as a mixed gas with air while accompanying air through the duct 8 engaged with the conduit 7 connected to the suction port 6. It is configured to be supplied into the furnace 1 through the port 6. By supplying this mixed gas, a decrease in the furnace temperature is suppressed, and the solvent-based resin 4 applied to the surface of the metal plate (strip) 3 is dried, thereby diluting the melt gas.

(Example) Next, examples of the present invention will be listed together with comparative examples.

1 on the surface of the example metal strip (thickness 0.4 m x width 1300 mm)
30 gm of resin (containing toluene ff 1700 g/f) was applied, dried at a threading speed of 10 m/min and a furnace temperature of 150°C, and gas was exhausted from the furnace at 15ONa+'/min.
00℃ radiant tube combustion exhaust gas 1ONs+3/
While introducing a mixed gas of 4 ONm'/min and air (2"0°C) into the furnace, the remaining 10 ONg3/min was used to dry the resin with air entering from the furnace outlet. The amount of coke oven generated gas (fuel) used to maintain the temperature inside the oven at 150°C is 51 Nt.
It was a3/h.

Comparative Example In the above example, only air (20°C) was used without mixing the combustion exhaust gas of the radiant tube with the air.
When the resin was dried by maintaining the furnace temperature at 150°C while introducing the coke oven into the furnace for 7 minutes, the amount of coke oven gas (fuel) used to maintain the furnace temperature was 150 Nm3/h.
This means that about three times as much fuel was used as in the example.

(Effects of the Invention) According to the present invention, the amount of fuel consumed by the drying furnace can be significantly reduced, so that it is possible to reduce costs and save energy.

In addition, there is no local drop in furnace temperature, the resin can be dried uniformly, the adhesion between the resin and the metal plate (strip) is uniform, and the quality of the resin composite metal plate can be improved. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a conventional drying oven, and FIG. 2 is a cross-sectional explanatory diagram of a drying oven showing an example of an embodiment of the present invention.

Claims (1)

[Claims] When manufacturing sandwich-type resin composite metal plates, the solvent-based resin coated on the surface of one metal plate (strip) is dried in a resin drying oven equipped with radiant tubes. A method for drying a sandwich type resin composite metal plate, characterized in that a mixed gas of: is supplied into the resin drying furnace.