JPH0639826Y2 - 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, in the conventional drying device of this type, an electric heater used at several hundreds of degrees Celsius is usually attached to the furnace body, so it is necessary to dry at a relatively low temperature of about 60 to 70 degrees Celsius. However, there is a drawback that the cost is high when used for drying wood, and there is a problem that unevenness in temperature is likely to occur when the attachment density of heaters is reduced.

It is also known to provide an air nozzle in front of such an electric heater to improve the drying speed, but there is a considerable difference in the air injection speed between the part near the blower and the part near the end of the pipe. Occurred, which was also the cause of uneven drying.

(Problems to be Solved by the Invention) The present invention solves the above-described conventional drawbacks, the equipment cost is low, uneven drying is not caused, and the coating film of wood is efficiently dried. The present invention has been completed to provide a coating film drying apparatus for wood.

(Means for Solving the Problems) The present invention, which has been completed to solve the above problems, disposes an infrared radiation heater using steam as a heat source near the wall surface of a furnace body to which painted wood is transferred. At the same time, an air nozzle for ejecting air from the surface of the loop-shaped pipe toward the wood is provided on the front surface of these infrared radiation heaters.

(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, and the coated wood (2) inside the furnace body (1) is hung and transferred by an appropriate transfer means (3) such as a free conveyor. Has been done.

Reference numeral (4) is an infrared radiant heater which uses steam as a heat source and is disposed near the wall surfaces on both sides of the furnace body (1). This infrared radiation heater (4) has a pressure of, for example, ^{2 to 3} kg / cm ² and 120 ° C.
Pass water vapor with a certain temperature through many metal tubes,
This is a panel-shaped heater that radiates infrared rays from its surface. In the embodiment, a plurality of heaters each having a size of about 1000 mm × 1200 mm are attached in the furnace length direction.

Further, an air nozzle (5) for ejecting air toward the wood (2) transported in the furnace is provided on the front surface of these infrared radiation heaters (4). As shown, the air nozzle (5) is formed on the side surface of a plurality of pipes (7) rotatably supported by joints (6) such as elbows, and both ends of these pipes (7). Is connected to the vertical pipes (8) and (8) at both ends to form a loop pipe. Here, “loop-shaped” means that each pipe (7) communicates with another pipe (7) without being blocked at both ends. Air at room temperature is supplied from the blower (9) to the air nozzle (5), but the air is heated while passing through the inside of the furnace of the pipe (7), and blows out as hot air of about 60 to 70 ° C. It will be. Also, the air nozzle (5) has its upper portion slightly downward as shown in FIG.
The atmosphere temperature in the furnace is made uniform.

In addition, (10) is an ultraviolet drying oven which is provided continuously to the furnace body (1), and wood (2) coated with an ultraviolet curing paint.
It is intended to irradiate the composition with ultraviolet rays for curing, but it can be omitted if the ultraviolet curing coating is not used.

(Operation) With the above-mentioned structure, if the painted wood (2) is suspended by the transfer means (3) and passed through the furnace,
The wood (2) is dried by receiving radiant heat from the infrared radiation heater (4) and hot air from the air nozzle (5).

Particularly, in the present invention, since the infrared radiant heater (4) using steam as a heat source is used as the heat source, the surface temperature thereof can be maintained at a relatively low temperature suitable for drying wood, and the conventional electric heat The equipment cost and running cost can be significantly reduced as compared with a conventional heater. Further, by disposing the infrared radiation heater (4) over a wide area in the furnace as shown in the figure, it is possible to prevent uneven temperature distribution.

Further, in the present invention, since the air nozzle (5) for ejecting air from the surface of the loop pipe (7) toward the wood (2) is provided on the front surface of the infrared radiation heater (4), the wood ( The coating film of 2) removes the heat film on the surface that obstructs heat transfer by the air flow, and also receives the action of heat transfer by the convection of air, and removes the solvent vapor evaporated from the coating film. And, the drying proceeds rapidly in combination with the stirring action of the atmosphere in the furnace. Moreover, since the pipe (7) has a loop shape, the air pressure inside the pipe (7) can be made uniform throughout.
Since the air flow velocity can be maintained uniform, it is possible to prevent uneven drying.

(Effect of the Invention) As described above, since the wood coating film drying apparatus of the present invention uses the infrared radiant heater having steam as the heat source, the equipment cost can be reduced and the temperature unevenness can be reduced. Can be less likely to occur. In addition, since an air nozzle that ejects air from the surface of the looped pipe toward the wood is provided in front of these infrared radiant heaters, the wood radiates heat from the infrared radiant heater at the same time as the wood has a uniform velocity. The coating film can be rapidly and uniformly dried by the drying action of the air flow.

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]

FIG. 1 (A) is a partially cutaway front view showing an embodiment of the present invention,
1 (B) is a partially enlarged view thereof, FIG. 2 (A) is a sectional view of an embodiment of the present invention, and FIG. 2 (B) is a partially enlarged view thereof. (1): furnace body, (2): wood, (4): infrared radiation heater using steam as a heat source, (5): air nozzle, (7):
Piping.

Claims (1)

[Scope of utility model registration request] 1. An infrared radiant heater (4) using steam as a heat source is provided near the wall surface of a furnace body (1) to which coated wood (2) is transferred, and these infrared radiant heaters (4) are also provided. An air nozzle (5) for ejecting air from the surface of the looped pipe (7) toward the wood (2) is provided on the front surface of the wood coating drying apparatus.