JPH0621580Y2 - Wood coating film drying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a coating film drying apparatus for wood used for efficiently drying coated wood.

(Prior Art) A coating film drying apparatus for wood, which dries coated wood through a furnace to dry the wood, has been conventionally known. However, this type of conventional drying device usually has an electric infrared radiant heater, which uses electricity as a heat source, attached to the furnace body.
There is a drawback that the cost is high to use it for drying wood that needs to be dried at a relatively low temperature, and there is a problem that temperature unevenness is likely to occur when the heater mounting density in the furnace is reduced. .

Further, the drying of the coating film by the electric infrared heater having a high surface temperature has a problem that only the surface layer portion of the coating film is rapidly dried and it is difficult to uniformly dry the entire coating film.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional drawbacks, is low in equipment cost, does not cause unevenness in drying, and can uniformly dry the entire coating film. The present invention has been completed in order to provide a possible wood coating film drying apparatus.

(Means for Solving the Problems) The present invention made to solve the above problems is a vapor-type infrared radiant heater using steam as a heat source in a longitudinal direction inside a furnace body to which painted wood is transferred. And an electric infrared radiant heater using electricity as a heat source are alternately provided.

(Embodiment) The present invention will be described in more detail with reference to an embodiment shown in the drawings.

In the figure, (1) is a tunnel type furnace body, wood (2) coated inside the furnace body (1) is transferred at a constant speed by an appropriate transfer means (3) such as a conveyor. There is.

(4) is a vapor-type infrared radiant heater that uses steam as a heat source and is arranged on the ceiling of the furnace body (1). This steam type infrared radiant heater (4) is a panel type in which steam having a pressure of 2-3 kg / cm ² and a temperature of 120 ° C. is passed through a large number of thin metal tubes and infrared rays are radiated from the surface thereof. , Which is about 1000 mm × 1200 mm in size in the embodiment.

Further, (5) is an electric infrared radiant heater using electricity as a heat source. As the electric infrared heater (5), for example, a type in which a nichrome wire is embedded inside a ceramic plate and infrared rays are radiated from the surface of the ceramic plate heated to several hundred degrees Celsius can be used. .

In the present invention, these steam type infrared radiant heaters are used.
(4) and the electric infrared radiant heater (5) are alternately installed in the longitudinal direction inside the furnace body so that the relatively low temperature drying zone and the relatively high temperature drying zone are alternately repeated. There is.

In the embodiment, these vapor-type infrared radiation heaters (4)
Although the electric infrared radiant heater (5) is provided on the ceiling of the furnace body (1), it goes without saying that it may be provided on the side wall.

(Operation) In the coating film drying apparatus for wood of the present invention configured as described above, the painted wood (2) is transported by a transfer means (3) such as a conveyor.
Thus, if the wood (2) is passed through the furnace, the wood (2) is alternately subjected to drying by the steam type infrared radiation heater (4) and drying by the electric type infrared radiation heater (5). When passing through the front surface of the electric infrared radiant heater (5), the surface temperature of the heater is high, so the surface of the coating film is dried relatively quickly, and the solvent concentration in the thickness direction of the coating film as described above is increased. A gradient of However, following this, the wood (2) passes through the front surface of the vapor infrared radiant heater (4), which has a relatively low surface temperature, during which the gradient of the solvent concentration in the thickness direction is relaxed inside the coating film. Occurs, and the solvent inside moves to the surface side. Then, the wood (2) again passes through the front surface of the electric infrared radiation heater (5), and the surface of the coating film is again dried relatively quickly.

As described above, according to the wood coating film drying apparatus of the present invention, it is possible to dry the coating film depending on the strength. Therefore, as compared with the conventional coating film drying apparatus that performs drying with the same strength. The coating film can be uniformly dried at a higher speed.
Further, according to the present invention, there is no fear that the wood (2) is unevenly dried.

Although it is possible to use all the heaters as electric infrared radiation heaters (5) to increase or decrease the surface temperature of each block, according to the present invention, the infrared radiation heaters (4) using steam as a heat source are used. Therefore, the equipment cost is reduced, and since steam with low cost can be used as a heat source, running cost can be reduced.

(Effects of the Invention) As described above, the wood coating film drying apparatus of the present invention includes a steam infrared radiation heater that uses steam as a heat source and an electric type that uses electricity as a heat source in the longitudinal direction inside the furnace body. By alternately providing infrared radiant heaters, the entire coating film can be dried uniformly and quickly, and equipment cost and running cost can be reduced and the coating film of wood can be economically dried. .

Therefore, the present invention has an extremely large practical value as a coating film drying apparatus for wood that solves the conventional problems.

[Brief description of drawings]

The drawings are sectional views showing an embodiment of the present invention. (1): Furnace body, (2): Wood, (4): Steam type infrared radiant heater, (5): Electric type infrared radiant heater.

Claims (1)

[Scope of utility model registration request] 1. A steam type infrared radiation heater (4) using steam as a heat source and an electric infrared ray using electricity as a heat source in the longitudinal direction inside the furnace body (1) to which the painted wood (2) is transferred. A coating film drying apparatus for wood, characterized in that radiant heaters (5) are provided alternately.