JPH11333367A - Method for coating, heating and drying board-shaped material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage of a surface coating film when the coated building material is loaded or the adhesion of the materials to one another by necessarily and sufficiently heating and drying the surface-coated board- shaped building material while saving energy. SOLUTION: Heated air is blown against a board-shaped building material 1 with the surface coated in a coating equipment 3 to heat it, hence the paint deposited on the surface is heated, hardened and dried, and the building material 1 is continuously coated, heated and dried. In this case, the surface temp. of the heated and dried material 1 is measured by a thermometer 10, etc., and the heated air temp. is controlled so that the surface temp. is kept constant at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of heating and drying a plate-like building material. More specifically, the present invention performs necessary and sufficient heating and drying of a plate-like building material after surface painting while saving energy, and prevents crushing of a surface coating film and mutual adhesion of building materials during loading after cooling. The present invention relates to a method for heating and drying a plate-like building material that can be performed.

[0002]

2. Description of the Related Art In the production of plate-like building materials such as exterior materials, after the surface of a molded plate-like building material is painted, heated air is blown against the plate-like building material in a countercurrent direction to be heated and adhered to the surface. Drying is performed continuously after the coating material is cured by heating. During heating and drying, not only the paint adhered to the surface but also the substrate itself is heated, so the board temperature after heating and drying is high. There is a problem in quality and handling due to crushing or adhesion of plate-like building materials. For this reason, the plate-like building material after heating and drying is then cooled before loading. An air cooling system is generally used for cooling the plate-like building material. That is, indoor or outdoor air is taken in by a fan provided in the cooler, and is blown in a countercurrent direction to the heated and dried plate-like building material to cool the plate-like building material with air.

[0003]

However, if the heating air temperature during the heating and drying is constant, the plate temperature of the plate-like building material after the heating and drying may be excessively high or may not be sufficiently heated. Sometimes. The reason is that the plate temperature of the plate-like building material after the heating and drying depends on the temperature condition of the plate-like building material at the time of coating, and furthermore, the ambient temperature which greatly affects the thermal efficiency. For example, the plate temperature is likely to rise in summer due to the high ambient temperature, but not so much in winter due to the low ambient temperature. If the plate temperature rises more than necessary, it will be reflected in the subsequent cooling, and the plate temperature will not be sufficiently lowered, and the loading will cause crushing of the surface coating and mutual adhesion of building materials. Also, an unnecessary increase in the plate temperature is a waste of energy. At the time of heating and drying after the surface coating, not only the paint adhered to the surface but also the substrate itself is heated, so that there is a problem of energy loss in the heating and drying in the first place. It is desired to realize heat drying after surface coating of a plate-like building material having excellent energy saving properties.

[0004] The present invention has been made in view of the above circumstances, and solves the drawbacks of heating and drying after the surface coating of the plate-like building material, and saves energy by heating and drying the plate-like building material after the surface coating. The purpose of the present invention is to provide a method of coating, heating and drying plate-like building materials that can be carried out as necessary and sufficiently while cooling, and can prevent crushing of the surface coating film and mutual adhesion of the plate-like building materials during loading after cooling. And

[0005]

Means for Solving the Problems The present invention solves the above-mentioned problems by heating a plate-like building material by blowing heated air after surface coating, and heat-curing and drying the paint adhered to the surface, A method for continuously coating and heating and drying a plate-like building material, wherein the surface temperature of the plate-like building material after heating and drying is measured, and the heating air temperature is controlled so that the surface temperature is always constant. And a method for coating, heating and drying a plate-like building material.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a process diagram showing an embodiment of a method of coating and drying a plate-like building material according to the present invention. The production of plate-like building materials such as exterior materials is performed on a continuous line. For example, the plate-like building materials can be continuously coated, heated and dried, and cooled according to the process shown in FIG.

[0007] That is, before the plate-like building material (1) is preheated by spraying heated air in a preheating facility (2) prior to its surface coating, the surface of the sheet-like building material (1) is coated by a coating roll (4) or the like in the coating facility (3). Paint. Subsequently, the surface-coated plate-like building material (1) was sent to a heating and drying facility (5), where heated air was blown onto the plate-like building material (1) in the same manner as in the preheating facility (2), and was adhered to the surface. The paint is cured and dried by heating. Each of the preheating equipment (2) and the heating and drying equipment (5) can be provided with a circulation fan (6), a gas burner (7) and a hot air circulation duct (8). The heated heated air is blown in the countercurrent direction to the plate-like building material (1) through the hot air circulation duct (8) by the operation of the circulation fan (6).

In the plate-like building material (1) after heating and drying, not only the paint adhered to the surface but also the substrate itself is heated.
Since the plate temperature is high, if the plate-like building material (1) is loaded at such a high temperature, problems such as the collapse of the surface coating and the mutual adhesion of the plate-like building material (1) occur as described above. After the heating and drying, the plate-like building material (1) is air-cooled in the cooling facility (9).

For example, in the above-described series of coating and heating and drying steps for the plate-like building material (1), in the method of coating and heating and drying the plate-like building material according to the present invention, the surface temperature of the plate-like building material (1) after the heating and drying is obtained. Is measured, and the temperature of the heated air is controlled so that the surface temperature always becomes constant. Specifically, for example, a thermometer (10) such as an infrared non-contact type is provided outside the heating and drying equipment (5), and the gas burner (7) is controlled based on the temperature measured by the thermometer (10). A controller (11) for adjusting the output is connected to both the thermometer (10) and the gas burner (7), and the surface of the heat-dried plate-like building material (1) passed through the heat-drying equipment (5). The temperature is monitored, the temperature data is fed back to the air heating in the heating and drying equipment (5), and the heating air temperature during the heating and drying is adjusted so that the surface temperature of the plate-like building material (1) after the heating and drying becomes a constant temperature. Control. By doing so, the plate-like building material (1) can be heated to a constant temperature without being affected by the temperature conditions and the ambient temperature, and the plate temperature after heating and drying that occurs when the heating air temperature is set to a constant temperature. Variation can be suppressed. The plate-like building material (1) is heated as necessary and sufficiently, and the paint adhered to the surface is cured by heating and dried. Moreover, since the surface temperature of the plate-like building material (1) is kept constant, the heating of the substrate itself is suppressed, and the heating and drying after coating has little energy loss and energy saving. This is reflected in cooling after heating and drying. The temperature of the plate-like building material (1) is sufficiently lowered, and the surface coating film is not crushed at the time of loading, and the plate-like building material (1) does not adhere to each other. . Problems in quality and handling of the plate-like building material (1) are also solved.

[0010] Such control of the heated air temperature can be equally applied to the preheating performed in the preheating equipment (2) in the method of heating and drying the plate-like building material of the present invention. That is, a thermometer (10) of, for example, an infrared non-contact type is provided outside the preheating equipment (2), and the output of the gas burner (7) is adjusted based on the temperature measured by the thermometer (10). The controller (11) is connected to both the thermometer (10) and the gas burner (7), and monitors the surface temperature of the pre-heated plate-like building material (1) passed through the preheating equipment (2), The temperature data is fed back to the air heating during the preheating, and the heated air temperature during the preheating is controlled so that the surface temperature of the plate-like building material (1) after the preheating becomes a constant temperature. In this case,
The temperature condition of the plate-like building material (1) at the time of painting is always constant,
It is easy to control the temperature of the heated air during heating and drying.

An embodiment will be described below.

[0012]

EXAMPLES (Example 1, Comparative Examples 1 and 2) An organic paint is applied to a cement-based plate-like building material having a width of 455 mm, a length of 3030 mm, a plate thickness of 12 mm and a plate temperature of about 10 to 30 ° C.
After coating at g / m ² , coating and heating and drying were carried out under the conditions shown in Table 1 below, followed by continuous cooling.

[0013]

[Table 1]

In the first embodiment, the temperature of the heated air during preheating and heating and drying is controlled so that the surface temperature of the plate-like building material thereafter becomes constant. On the other hand, in the first and second comparative examples, the preheating is performed. And the drying temperature was controlled to be constant. Further, in Comparative Example 1, the temperature between the facilities was set to 30 ° C. assuming the summer, and in Comparative Example 2, the temperature between the facilities was set to 10 ° C. assuming the winter.

Table 2 shows the evaluation of the plate temperature and the crushing of the surface coating film when the respective plate-like building materials were loaded after cooling.

[0016]

[Table 2]

As is clear from Table 2, in Example 1 based on the method of coating and drying the plate-like building material according to the present invention,
The plate temperature of the plate-like building material after cooling is sufficiently lowered, and the surface coating does not collapse. It is considered that the plate-like building material is required and sufficiently heated without being affected by the temperature condition and the ambient temperature, and the heat drying after the coating is considered to have reduced energy loss and energy saving. It is considered that the adhesion between the plate-like building materials is also prevented.

On the other hand, from Comparative Examples 1 and 2, when the ambient temperature was low, the temperature of the plate-like building material was sufficiently lowered after cooling,
Although the surface coating film is not crushed, it is confirmed that the plate temperature at the time of loading depends on the ambient temperature, and when the ambient temperature is increased, the plate is heated more than necessary at the time of heating and drying and is not cooled until loading is possible. This causes problems in quality and handling of the plate-like building material, and is considered to cause a large energy loss.

Of course, the present invention is not limited by the above embodiments. It goes without saying that various aspects are possible for details such as the type, shape and material of the plate-like building material, components of the paint, and heating and cooling temperatures.

[0020]

As described above in detail, according to the present invention, heating and drying of a plate-like building material after surface coating can be performed as necessary and sufficiently while saving energy. Can be prevented from occurring.

[Brief description of the drawings]

FIG. 1 is a process diagram showing one embodiment of a method for coating and drying a plate-like building material according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plate-like building material 2 preheating equipment 3 coating equipment 4 coating roll 5 heating and drying equipment 6 circulation fan 7 gas burner 8 hot air circulation duct 9 cooling equipment 10 thermometer 11 controller

Claims (2)

[Claims] 1. A method of heating a plate-like building material by spraying heated air after the surface coating, heating and drying the paint adhered to the surface, and continuously coating and heating-drying the plate-like building material, Measure the surface temperature of the plate-like building material after heating and drying,
A method for heating and drying a plate-like building material, wherein the heating air temperature is controlled so that the surface temperature is always constant. 2. A method for measuring the surface temperature of a pre-heated plate-like building material when the plate-like building material is preheated by blowing heated air on the plate-like building material prior to the surface coating, so that the surface temperature always becomes a constant temperature. The method of coating, heating and drying a plate-like building material according to claim 1, wherein the heating air temperature during heating is controlled.