JP2009254928A - Apparatus and method for coating decorative board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for coating decorative boards enabling stable coating of designed surfaces of decorative boards for building. <P>SOLUTION: In a first blower 41 in a blowing section 4 which adjusts the thickness of a coating film on a designed surface a1, the direction of a blowout slit 41a is specified, and the air blowout direction is restricted to a predetermined angle. More specifically, viewing the coating apparatus 1 from above, the blowout direction of the blowout slit 41a is deflected clockwise by 27° relative to a first reference axis L1. Viewing the coating apparatus 1 from the side, the blowout direction of air from the blowout slit 41a is inclined by 20° relative to a second reference axis L2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a decorative device for coating a decorative plate and a decorative plate coating method for coating, for example, a decorative decorative plate.

  For example, an architectural decorative board (hereinafter referred to as a decorative board as appropriate) used in a large number on a floor or wall in a house or on a roof or outer wall of a house is well known (see, for example, Patent Document 1). Examples of the decorative board include ALC and wood cement board. As shown in FIG. 8, such a decorative plate a has a convex joint b (so-called sane) formed on one side and a concave joint c (groove) formed on the other side. Then, it is constructed by abutting the convex joint portion b 'of another decorative plate against the concave joint portion c and joining them next to each other.

  By the way, the design surface a1 of the decorative board a is surface-coated for the purpose of coloring or forming a protective layer. As a coating method, a roll coat method, an airless spray method, and an air spray method are widely known (see, for example, Patent Document 2).

JP 2005-262463 A JP 2003-236455 A

  However, the above-described conventional coating apparatus or coating method has a problem that unevenness occurs on the painted surface and a uniform coating thickness cannot be formed. In particular, as shown in FIG. 10, such a problem appears remarkably in the decorative board a embossed on the design surface a1, and the peripheral edge of the concave portion on the design surface a1 is formed thicker than other parts. It was easy to be done and the paint pool g was easy to generate | occur | produce.

  The present invention has been made paying attention to such problems existing in the prior art, and the object of the present invention is to provide a decorative device for a decorative plate, which can apply a paint evenly on the design surface of the decorative plate, and The object is to provide a method of painting a decorative board.

  The present invention provides a decorative board conveying means for conveying an architectural decorative board having a design surface in a predetermined conveying direction with the design surface facing upward, and the decorative board conveying means that conveys the decorative decorative board. Curtain flow coat-type design surface coating means for allowing paint to flow down naturally on the design surface of the decorative plate and applying the paint to the design surface; conveyed by the decorative plate conveying means; and the design surface coating A predetermined amount of paint is left on the design surface by blowing air from above on the decorative plate on which the paint is applied by the attaching means, and blowing off a part of the paint on the decorative plate to leave a predetermined amount on the design surface. A decorative sheet coating apparatus comprising: a coating film thickness control means for a design surface for forming a thick coating film.

  The decorative device for a decorative board according to the present invention has a configuration in which the amount of paint on the design surface can be set to a desired amount by blowing off the paint that has flowed down on the decorative surface of the decorative plate, and a desired coating film on the design surface. A thick coating film can be formed without unevenness.

  Further, the coating surface thickness control means for a design surface includes a blower device disposed above the decorative plate, and the blower device is formed with a blow slit for blowing air downward, and the blow slit The blow slit direction which is the longitudinal direction is set within an angle range of 10 to 40 ° in a plan view with respect to a horizontal first reference axis orthogonal to the conveying direction of the decorative plate, and downward from the blow slit The air blowing direction is inclined within a range of 10 to 40 ° to the base end side in the conveying direction in a side view with respect to a vertical second reference axis perpendicular to the conveying direction of the decorative plate. It is desirable that air is set to blow out toward the base end side in the transport direction.

  Assuming that the orientation of the blow slit is the above condition, surplus paint on the design surface flows in a direction at an oblique angle with respect to the transport direction by blowing air from the blower, and the design surface is temporarily embossed. However, no paint pool is generated, and a coating film can be uniformly formed on the design surface to provide a coating with no unevenness.

  In addition, an apparatus housing having an internal space is provided, the blower device is disposed in the apparatus housing, and the decorative plate is conveyed in the apparatus housing under the blower device, and In the apparatus casing, the base end side in the conveying direction of the decorative plate is the front of the apparatus casing, and the conveying direction side is the rear of the apparatus casing, and the rear of the blower An exhaust-only air communication passage that is disposed and communicates between the inside of the device casing and the outside of the device housing, and an exhaust-only exhaust fan, and the exhaust-only fan is driven to drive the exhaust-only air communication passage. It is desirable to have an exhaust means for exhausting the air inside the apparatus casing to the outside of the apparatus casing via the.

  In the above configuration, the air blown by the blower flows forward, whereas the exhaust air flows backward. It is difficult for the blown air to flow into the communication path. Therefore, the paint blown off by the blown air is less likely to enter the air communication path, and the exhaust means is not easily contaminated by the paint contained in the air. Further, by adopting a single fan for exhaust, exhaust can be performed from the exhaust-dedicated air communication passage stably at all times.

  In addition, it is more preferable that the blowing slit direction is set within an angle range of 20 to 30 ° in a plan view with respect to the first reference axis. Further, it is more preferable that the air blowing direction is inclined with respect to the second reference axis within an angle range of 15 to 35 ° toward the base end side in the transport direction in a side view.

  Further, the design surface coating means includes a paint tank having a slit opened at a lower portion thereof, and a paint supply means for supplying the paint to the paint tank, and the paint tank has a paint contained in the paint tank. An overflow port that flows out of the paint tank is disposed at a position higher than the slit, the paint is supplied into the paint tank by the paint supply means, and the paint flows out from the slit, and the overflow port It is desirable that the paint flows out from the paint tank to the outside.

  With this configuration, the liquid level of the paint in the paint tank becomes constant, and the paint flows out quantitatively from the slit with a constant flow pressure. For this reason, the outflow amount (flow velocity) per unit time becomes constant, and long-time continuous coating can be performed stably.

  In addition, the present invention conveys an architectural decorative board having a design surface in a posture in which the design surface is directed upward, and the paint surface is allowed to flow down naturally in a curtain shape onto the decorative surface of the decorative board. A paint is applied to the decorative board, and the paint is coated on the design surface. Air is blown from above to blow off a portion of the paint on the decorative board, leaving a required amount of paint on the design surface. The decorative board coating method is characterized in that a coating film having a predetermined thickness is formed on the design surface.

  As described above, when the paint that has flowed down on the design surface of the decorative plate is blown off and the amount of the paint on the design surface is set to a desired amount, a coating film having a desired coating thickness can be uniformly formed on the design surface.

  In addition, the air speed of the air may be changed to increase or decrease the amount of paint sprayed on the design surface of the decorative plate to adjust the coating film thickness of the paint formed on the design surface. Good.

  With such a configuration, since the amount of paint blown off increases or decreases, the amount of paint on the design surface can be adjusted to control the film thickness of the coating film.

  INDUSTRIAL APPLICABILITY The present invention has an excellent effect that the design surface of a decorative board can be applied evenly. In addition, there is an effect that the coating speed does not decrease as compared with the conventional case, and for example, the speed of the decorative board during conveyance can be set to 10 to 80 m / min. Moreover, the coating efficiency is good, and an eco-coating apparatus or an eco-coating method can be obtained.

  The decorative device 1 for decorative sheets (hereinafter referred to as the “applicator 1”) of the present invention is designed to be applied to a decorative decorative plate a (see FIGS. 9 and 10). And this coating apparatus 1 paints the design surface a1 of this decorative board a, the surface of the convex junction part b, the inner surface c1 of the concave junction part c, and a part of lower surface d. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the coating apparatus 1 includes a curtain flow coat type design surface coating unit 2 (design surface coating unit), a decorative plate transport unit 3 (decorative plate transport unit), and a blower unit 4 (design surface). Coating thickness control means), a concave joint application portion 5 as concave joint application means, and an exhaust section 7 (exhaust means) shown in FIG. For convenience, the coating apparatus 1 will be described with the design surface coating portion 2 side as the front and the exhaust portion 7 side as the rear. That is, the decorative board a to be painted is conveyed from the front to the rear of the coating apparatus 1 in the painting process.

The decorative board transport unit 3 will be described.
The decorative plate transport unit 3 is a so-called conveyor, and includes a plurality of disk-shaped transport rollers 31 arranged in a row. When the decorative plate a is placed on the transport roller 31 and the transport roller 31 is rotationally driven, the decorative plate a is transported toward the rear of the coating apparatus 1 in a horizontal posture with the design surface a1 facing up. Specifically, the decorative board conveying section 3 is arranged before and after a design surface coating section 2 described later, and the decorative board a conveyed by the decorative board conveying section 3 is transferred from the paint tank 21 to the curtain. The paint passes through the lower part of the paint tank 21 so as to cross the paint X flowing down in a shape, and is transferred to the air blowing part 4 described later disposed behind the design surface coating part 2. In addition, the position where the coating material X flows down on the design surface a1 of the decorative board a in the conveyance path of the decorative board a is defined as an application position P (see FIG. 2). By the way, a well-known structure is suitably employ | adopted for the said decorative board conveyance part 3. FIG.

The said design surface coating part 2 is demonstrated.
The design surface coating portion 2 is for applying the paint X to the design surface a1 of the decorative board a, and includes a paint container 21 having a wide container shape opened upward as shown in FIGS. . A slit 22 is formed at the lower end of the paint tank 21 along the width direction of the paint tank 21, and the paint X existing in the paint tank 21 flows down from the slit 22 and flows down in a curtain shape. . By the way, a shutter (not shown) that opens and closes the slit 22 is attached to the slit 22, and the paint tank 21 is in a paint storage state or a paint flowable state by electrically controlling the shutter. It is possible. The state in which the paint X is applied is a state immediately after the liquid paint X is attached, and is a state before curing.

The concave joint coating portion 5 will be described.
As shown in FIGS. 1 and 3, the concave joint application portion 5 includes a concave joint paint tank 55 for storing the paint X. The concave joint paint tank 55 is a vertically long container opened upward, and has a paint flow hole 55a formed at the lower end. A concave joint nozzle 57 is connected to the paint flow hole 55a via a paint guide pipe 56, and the paint flow hole 55a and the concave joint nozzle 57 are in communication with each other. The paint guide tube 56 is made of a flexible material, and the direction of the concave joint nozzle 57 can be freely changed. However, the paint guide tube 56 may be made of a non-flexible material so that the concave joint nozzle 57 can be stably fixed. By the way, an electrically controlled electromagnetic valve 58 is attached to the paint guide tube 56, and the paint flow down hole 55 a can be appropriately opened or closed by the control of the electromagnetic valve 58. .

The said ventilation part 4 is demonstrated.
The said ventilation part 4 is arrange | positioned behind the said design surface coating part 2, as shown to FIG. More specifically, the air blower 4 is located outside the booth 70 and the first air blower 41 disposed in the booth 70 (device housing) having an internal space, and is arranged behind the first air blower. It is comprised with the 2nd ventilation apparatus 42 currently made. In addition, since the ventilation part 4 is a principal part of this invention, it mentions later for details.

  Moreover, as shown in FIG. 1 etc., the air interruption | blocking part 33 is arrange | positioned between the said design surface coating part 2 and the ventilation part 4. As shown in FIG. The air blocking part 33 prevents the blown air of the first blower device 41 from entering the coating position P even when the decorative plate a passes through the decorative plate a while allowing the decorative plate a to pass immediately after the application. Is. Specifically, horizontally long resin plates 34a and 34b made of a flexible resin material are arranged in two upper and lower stages. The upper end of the upper resin plate 34a and the lower end of the lower resin plate 34b are fixed. In such a configuration, normally, the resin plates 34 a and 34 b arranged above and below block between the design surface coating portion 2 and the blower portion 4. On the other hand, when passing through the decorative plate a, as shown in FIGS. 1 and 2, the tip of the decorative plate a comes into contact with the upper end of the lower resin plate 34b from the front side, and further presses the resin plate 34b. Pass through while elastically deforming and bending backward. With this configuration, the blown air of the first blower device 41 is prevented from entering the coating position P while allowing the decorative plate a to pass therethrough. In addition, in order to protect the coating film surface of the coating film applied to the design surface a1, the resin plate 34a is prevented so that the lower end of the upper resin plate 34a does not contact the coating film surface when passing through the air blocking portion 33. The dimensions are set. Further, the configuration shown in FIG. 1 is provided with only one row of air blocking portions 33, but instead of this configuration, a plurality of rows may be provided along the conveying direction of the decorative board a.

The painting procedure in the above configuration will be briefly described.
First, the paint X is supplied and stored in advance in the paint tank 21 and the paint tank 55. And the unpainted decorative board a is put on the conveyance roller 31 from the foremost position in the coating apparatus 1, and conveyance is started toward the coating position P with the design surface a1 facing upward. When the decorative board a is detected in the immediate vicinity of the application position P by a sensor (not shown) provided in advance, the slit 22 and the paint flow hole 55a are automatically opened by electrical control. Then, from the paint tank 21, the paint X flows down in the form of a curtain with the design surface a1 as the object to be coated, and the coating film Y is formed on the design surface a1 of the decorative board a. Further, the surface of the convex joint b is also applied. At the same time, the paint X flows out from the concave joint nozzle 57 toward the inner surface c1 of the concave joint c of the decorative plate a substantially horizontally (slightly upward), and the concave joint is opened to the side. Paint X flows into c. Further, the decorative board a applied at the application position P is passed through the air blocking section 33 (see FIG. 2) and conveyed to the blower section 4. Then, the decorative board a is taken out from the booth 70 and the process proceeds to a drying process.

Next, details of the paint tank 21 will be described.
As shown in FIG. 2, an overflow port 24A is opened slightly above the paint tank 21, and a downward paint discharge pipe 24B disposed outside the paint tank 21 is provided in the overflow port 24A. It is connected. In this configuration, when the paint X is supplied to the paint tank 21 from the paint supply means 80, a residual paint guide pipe 77a described later, and the like, the liquid level of the paint X rises and reaches the position of the overflow port 24A. The excess paint X is discharged out of the paint tank 21 from the overflow port 24A. In such a configuration, when the supply amount is adjusted so that the paint X is always discharged from the overflow port 24A while supplying the paint X to the paint tank 21 with the slit 22 opened, the amount of paint in the paint tank 21 is adjusted. It is possible to allow the paint X to naturally flow down from the slit 22 while keeping the liquid level constant at the height position of the overflow port 24A. That is, the paint X can always flow down from the slit 22 at a constant pressure. With this method, even if the design surface a1 is embossed, a sufficient amount of paint is stably applied, so that unevenness does not occur. In this embodiment, the viscosity of the paint X is set to 5 to 30, preferably 13 to 20 seconds (NK II measuring device: Iwata Cup). When the coating material X having such a viscosity is used, even if there are a large number of convex portions on the design surface a1, the coating material X does not flow through the convex portions to form a thin film portion.

  In the present embodiment, an upper limit liquid level detection sensor 54A and a lower limit liquid level detection sensor 54B are disposed at the upper and lower positions of the overflow port 24A. Then, it is possible to detect that the supply level of the paint X becomes higher than the overflow port 24A due to excessive supply, or that the supply X becomes lower than the overflow port 24A due to insufficient supply, and either of the sensors 54A and 54B When the liquid level is detected, quantitative painting becomes impossible, so the painting operation is stopped immediately to avoid the occurrence of defects.

  Further, the paint X discharged by the paint discharge pipe 24B flows into a residual paint guide pipe 77a described later, and is guided to the paint tank 21 and reused.

  Further, as shown in FIG. 3, as in the paint tank 21, an overflow port 59A is opened at a slightly upper position of the concave joint paint tank 55, and a concave joint is formed at the overflow port 59A. A downward paint discharge pipe 59B arranged outside the paint tank 55 is connected. In this configuration, the paint X is supplied into the concave joint paint tank 55 from the paint supply means 80, the residual paint guide pipe 77a described later, and the like, the liquid level of the paint X rises, and the overflow port 59A. , The excess paint X is discharged out of the concave joint paint tank 55 from the overflow port 59A. In this configuration, when the supply amount is adjusted so that the paint is constantly discharged from the overflow port 59A while supplying the paint X to the concave joint paint tank 55 with the paint flow down hole 55a opened, the concave shape It is possible to allow the paint X to naturally flow continuously from the paint flow hole 55a while keeping the liquid level of the paint in the joint paint tank 55 constant at the height position of the overflow port 59A. In other words, the paint X can always flow out from the concave joint nozzle 57 with a constant pressure. When the paint X can flow out from the concave joint nozzle 57 at a constant flow rate, continuous coating for a long time (for example, 10 to 20 hours) while stably flowing out the paint from the concave joint nozzle 57. Is possible.

  The flow rate of the paint X flowing out from the concave joint nozzle 57 can be adjusted by appropriately changing the liquid level of the paint X stored in the concave joint paint tank 55. Further, the liquid level may be appropriately changed depending on the viscosity of the paint X. For example, it is proposed to increase the liquid level when the viscosity of the paint X is high. Desirably, when the paint X having the above-described viscosity is used, the liquid level of the paint X in the concave joint paint tank 55 is set to 400 mm or more from the height position of the outlet 57a, and more desirably 450 mm or more. Good. Further, as shown in FIGS. 1, 3, and 8, the concave joint nozzle 57 has a wide and thin shape, and a slit-shaped outlet 57a that is a horizontally long rectangle at the tip is directed substantially horizontally. . In the outlet 57a, for example, the inner width is set to 40 mm, and the longitudinal inner dimension is set to 3 mm. Further, the concave joint nozzle 57 is disposed at a position facing the concave joint c of the decorative board a conveyed by the decorative board conveying section 3, specifically, at the coating position P. The inner surface c1 of the concave joint c that is disposed adjacent to and passes through the coating position P and that opens laterally is positioned so that the outlet 57a of the concave joint nozzle 57 faces each other. ing. Specifically, the paint outflow direction from the outflow port 57a is set in a range that is slightly upward (elevation angle 0 to 15 °) or slightly downward (elevation angle 0 to −15 °) from horizontal or horizontal. The most desirable is a configuration in which the paint outflow direction is slightly upward (elevation angle 0 to 15 °). The size of the outlet 57a is suitably changed depending on the thickness of the decorative board a, the inner width is 10-60 mm, preferably 20-40 mm, and the longitudinal inner dimension is 3 mm. It is preferable to be in a range of ˜5 mm. By setting to such a range, it can be made wider with respect to the dimension of the concave joint part c of the decorative board a whose dimensions are defined by the standard, and can be preferably arranged so as to face the concave joint part c. it can. The sensors 54A and 54B may be applied to the concave joint paint tank 55.

  The paint X discharged by the paint discharge pipe 59B flows into a residual paint guide pipe 77a described later and is reused.

Next, the air blower 4 will be described in detail.
The first air blower 41 of the blower unit 4 includes a horizontally long blow slit 41 a provided at the lower end of the device main body, and is connected to the first blower fan 44, and the outside air blown by the first blower fan 44 is Blowing air is blown out from the blowing slit 41a. The second air blower 42 includes a horizontally long blowing slit 42a having the same configuration and is connected to the second blower fan 45 so that the outside air blown by the second blower fan 45 is blown from the blow slit 42a. It is blown out as air. The blown air from the second blower fan 45 enters the booth 70 from the opening 70 </ b> A of the booth 70.

In such a configuration, the first blower device 41 blows air to the decorative board a coated with the paint X at the design surface coating unit 2 to blow off a part of the surplus paint X, and on the design surface a1. The film thickness of the coating film Y is adjusted. That is, the first blower device 41 plays a role as a means for controlling the coating thickness of the design surface a1, and jets high-pressure air to blow off excess paint, leaving a predetermined amount of paint to be desired. A coating thickness of 1 is obtained. In the present embodiment, the wind speed of the blown air is preferably 20 to 30 m / second, but can be changed by an inverter, and the coating film Y of the decorative board a is controlled in units of 10 g / m ² by controlling the wind speed. be able to.
Further, the second blower 42 is configured to prevent the paint X blown off by the first blower 41 from jumping out from the opening 70A of the booth 70 and contaminating the coated decorative board a. It blows toward the part 70A.

Further, in the first blower 41, as shown in FIGS. 6a and 6b, the direction of the blow slit 41a is defined, and the blow direction of the air is set within a predetermined angle range. Specifically, as shown in FIG. 6a, when the coating apparatus 1 is viewed in plan, the blowing slit direction in the longitudinal direction of the blowing slit 41a is relative to the reference axis L1 orthogonal to the conveying direction of the decorative plate a. It is tilted by 27 ° (in the figure: α). The angle α is preferably 10 to 40 °, and more preferably 20 to 30 °.
Further, as shown in FIG. 6b, when the coating apparatus 1 is viewed from the side, the air blowing direction from the blowing slit 41a is inclined by 20 ° (β in the figure) with respect to the vertical reference axis L2. Is set. By this inclination, the air from the blowing slit 41a is blown out toward the front of the booth 70 (that is, the base end side in the transport direction). The angle β is preferably 10 to 40 °, and more preferably 15 to 35 °. By setting it as this structure, the excess coating material which flowed down on the design surface a1 of the decorative board a will flow in the direction of an angle with respect to the said conveyance direction, and this design surface a1 (when embossed) In addition, a coating film can be uniformly formed to provide a coating with no unevenness. When the angles α and β are set outside the above range, the coating film is not uniformed, and the embossed design surface a1 has paint around the recesses (depressions). The paint pool is generated.
The first blower 41 constitutes the blower of the coating surface thickness control means for design surface according to the present invention.

  By the way, the residual paint X that has flowed down or blown off from the decorative board a in the design surface coating part 2 and the blower part 4 is collected in the booth 70 and the residual paint guide provided in the booth 70. The pipe 77a guides the paint tank 21 again and reuses it in the paint tank 21. In addition, pumps (not shown), such as a diaphragm pump, can be used for liquid feeding to the paint tank 21.

  Further, at the position adjacent to the concave bonding portion nozzle 57, a concave bonding portion coating film thickness control section 47 as a concave bonding portion coating film thickness control means is disposed. The concave joint coating thickness control section 47 includes an air nozzle 47A and an independent blower fan 47B connected to the air nozzle 47A, and blows air toward the concave joint c to which the paint X is applied. Has the function of sending air. Specifically, as shown in FIG. 3, the tip of the air nozzle 47 </ b> A is disposed at a position facing the concave joint c of the decorative plate a conveyed by the decorative plate conveying unit 3.

  In this configuration, when air is blown from the air nozzle 47A toward the concave joint c to which the paint X from the concave joint nozzle 57 has been applied, a part of the excess paint X in the concave joint c is partially obtained. It is blown away, and the film thickness of the coating film Y on the inner surface c1 of the concave joint c can be adjusted to a desired amount. In other words, the coating thickness controller 47 for the concave joint serves as a means for controlling the coating thickness of the inner surface c1 of the concave joint c, and blows away excess paint X by jetting high-pressure air. The desired coating thickness is obtained by leaving a predetermined amount of paint.

  As shown in FIG. 3, paint dripping prevention plates 35 and 35 are disposed at outer positions of the conveying roller 31 in the design surface coating unit 2 and the blower unit 4, respectively. More specifically, each of the paint dripping prevention plates 35 and 35 is formed of a long thin plate, and is fixed at a position just outside the transport roller 31 along the transport direction of the decorative plate a. The height position of the paint dripping prevention plate 35 is set so that the upper end of the paint dripping prevention plate 35 and the upper end of each transport roller 31 are substantially flush with each other. In such a configuration, the decorative board a to be transported contacts the lower surface d near the concave joint c with the upper edge 35 a of the paint dripping prevention plate 35 in the design surface coating part 2 and the blower part 4. It is conveyed while letting. Then, as will be described later, surplus paint X wraps around the lower surface d from the side surface of the decorative plate a, passes through the lower surface d, and the paint X adheres to the non-coating portion set at the center of the lower surface of the decorative plate a. To prevent that. For example, as the paint dripping prevention plate 35 with respect to the aqueous paint, those made of a plastic material are suitable.

  Further, as shown in FIG. 3, air nozzles 46 and 46 (air blowing means) are arranged between the paint dripping prevention plate 35 and the transport roller 31. The air nozzle 46 discharges air outward from the position near the center of the decorative plate a to be conveyed (behind the paint dripping prevention plate 35) toward the upper edge 35a of the paint dripping prevention plate 35. Yes, it supplementarily prevents the paint X from adhering to the non-painted portion due to wind pressure. In order to vent the air from the air nozzle 46 to the outside of the paint dripping prevention plate 35, a ventilation notch portion may be provided on the upper edge 35 a of the paint dripping prevention plate 35 and the air may be ventilated through the notch portion. .

Next, the exhaust part 7 will be described.
As shown in FIG. 7, the exhaust unit 7 is disposed at the tail end of the booth 70 of the coating apparatus 1. More specifically, one end of an exhaust guide pipe 71 serving as an exhaust-only air communication passage is connected to the side surface behind the booth 70, and a filter 72 is disposed in the middle of the exhaust guide pipe 71. The exhaust guide pipe An exhaust-only fan 73 is disposed at the other end of 71.
In this configuration, when the exhaust exclusive fan 73 is driven, air (including dust) in the booth 70 is introduced into the exhaust guide pipe 71, and the air passes through the filter 72 to remove dust and the like. After that, it is continuously exhausted to the outside in a clean state. The paint X introduced into the exhaust guide pipe 71 flows into the residual paint guide pipe 77b connected to the exhaust guide pipe 71, and is guided to the paint tank 21 by the residual paint guide pipe 77b. Reused in the paint tank 21. The exhaust unit 7 is a fan different from the fans 44 and 45 used in the blower unit 4 and is configured by the exhaust-only exhaust fan 73 that is always driven and is exhausted. The function does not stop, and even if the paint contains a volatile organic solvent, the solvent is not concentrated, and the coating apparatus 1 can be operated by properly exhausting without trouble. Therefore, the coating apparatus 1 is compatible with a clean environment.
Moreover, since this coating apparatus 1 uses the two air blowers 41 and 42 in the ventilation part 4, and it is blowing toward the front of the said coating apparatus 1, the air containing a paint flows forward. It is easy and very little paint is collected in the exhaust part 7 located at the tail end. For this reason, the replacement cycle of the filter 72 is extended and the cost is reduced.
By the way, this coating apparatus 1 can be operated by using two blower units in which the power consumption of the motor that rotates the fan is 11 kW when the decorative board a having a board width of 1 m is to be coated. On the other hand, the vacuum coating type conventional apparatus needs to use four air blowers with the power consumption of 22 kW. In addition, the circulation type conventional device needs to use two air blowers with power consumption of 22 kW.

Again, control of the coating thickness on the design surface a1 and the inner surface c1 of the concave joint c will be described.
When blown air is blown onto the design surface a1, the coating film Y on the design surface a1 is blown off by a predetermined amount, and the coating film thickness of the coating film Y is adjusted to a desired amount. Also, in the concave joint c, excess paint in the concave joint c is blown off by the air blown from the air nozzle 47A, the amount of the paint is controlled, and a paint having a desired coating thickness is applied. The In addition, since the blow-off amount of the paint X on the design surface a1 can be adjusted by changing and adjusting the air volume of the air from the blower 41 of the blower unit 4 in advance, it is possible to apply the coating film Y on the design surface a1. The film thickness can be controlled. Further, since the amount of the paint X blown off in the concave joint c can be adjusted by changing and adjusting the air volume from the air nozzle 47A in advance, the coating thickness of the coating film Y in the concave joint c Can be controlled.

  According to the above-described coating method, when the paint is applied in the concave joint c, turbulence of the paint X does not occur in the concave joint c, and scattering of the paint X is suppressed. The paint X efficiently penetrates deeply into the concave joint c, and the coating film Y having a desired thickness is surely formed. In addition, since the paint X in the concave joint paint tank 55 is allowed to flow naturally from the paint flow hole 55a, the flow of the paint X flowing out from the concave joint nozzle 57 is stabilized and reliable coating is performed. Is possible. Specifically, as shown in FIG. 4, on the inner surface c1 of the concave joint c, the coating film Y can be uniformly formed on the inner bottom surface c2 and the inner surface c3 with a coating thickness of about 10 mm. Further, since the amount of paint X scattered is significantly reduced, the coating efficiency is improved as compared with the conventional case, and a coating efficiency of 90% or more can be realized. Conventionally, as shown in FIG. 9, the coating film Y could not be uniformly formed on the inner bottom surface c2 and the inner side surface c3 on the inner surface c1 of the concave joint c.

  Moreover, since the said coating apparatus 1 performs the coating process simultaneously on the design surface a1 and the recessed junction part c with respect to the decorative board a currently conveyed, it can make a coating speed 10-80 m / min.

  In addition, a part of the paint X flowing on the decorative board a due to the air blowing effect of the first blower device 41 goes around the side surface of the decorative board a and wraps around the lower surface d, but as shown in FIG. Since the paint dripping prevention plate 35 is disposed, the paint dripping prevention plate 35 drains the paint X by the paint dripping prevention plate 35 as shown in FIG. It won't get dirty. Further, since the air nozzle 46 is disposed behind the paint dripping prevention plate 35, it is possible to reliably prevent the paint from adhering to the non-painted portion.

The present invention is not limited to the embodiments described so far, and the design can be changed as appropriate. For example, the present invention is not limited to the shape of the concave joint c in the embodiment. Moreover, the above-mentioned coating material X can select various things, and can use aqueous property and oiliness. The present invention can also be applied to sealers and coats.
Moreover, you may employ | adopt the structure of the said concave junction part application part 5 for the coating of the convex junction part b of the decorative board a.

1 is a perspective view showing an outline of a coating apparatus 1. FIG. It is a side view which shows the application position P. FIG. It is a side view which shows the concave junction part coating part 5. FIG. 3 is a cross-sectional view showing a concave joint c coated by the coating apparatus 1. FIG. It is a side view which shows the ventilation part 4. FIG. a) is a plan view showing the blowing slit direction, and b) is a side view showing the blowing direction. FIG. 6 is a side view showing the exhaust part 7. a) is a front view of the concave joint nozzle 57, and b) is a longitudinal side view of the concave joint nozzle 57. It is sectional drawing of the decorative board a. It is sectional drawing which shows the concave junction part c painted by the conventional coating method. It is sectional drawing which shows the design surface a1 painted by the conventional coating method.

Explanation of symbols

1 Coating device for decorative plate 2 Design surface coating part (design surface coating means)
3 veneer conveying part (decorative board conveying means)
4 Air blower (design surface coating thickness control means)
7 Exhaust section (exhaust means)
21 Paint tank 22 Slit 24A Overflow port 41 First blower (blower)
41a Blowing slit 70 Booth (device housing)
71 Exhaust guide pipe (exhaust air communication passage)
73 Exhaust fan 80 Paint supply means a Decorative plate a1 Design surface L1 First reference axis L2 Second reference axis X Paint Y Paint film

Claims (8)

A decorative board conveying means for conveying an architectural decorative board having a design surface in a predetermined conveying direction in a posture with the design surface facing upward;
Curtain flow coat-type design surface coating means for causing the paint to naturally flow down in the form of a curtain onto the design surface of the decorative plate conveyed by the decorative plate conveying means, and to apply the paint to the design surface;
Air is blown from above on the decorative plate that is conveyed by the decorative plate conveying means and coated with the paint by the design surface applying means, and a part of the paint on the decorative plate is blown off on the decorative surface. A decorative sheet coating apparatus comprising: a coating surface thickness control means for a design surface that leaves a required amount of paint and forms a coating film having a predetermined thickness on the design surface.   The design surface coating thickness control means includes a blower disposed above the decorative plate, and the blower is formed with a blow slit for blowing air downward, and the length of the blow slit is long. The blow slit direction, which is a direction, is set within an angle range of 10 to 40 ° in a plan view with respect to a horizontal first reference axis perpendicular to the conveying direction of the decorative plate, and blows downward from the blow slit. The air blowing direction is inclined with respect to a vertical second reference axis orthogonal to the conveying direction of the decorative plate within a 10-40 ° angle range toward the base end side of the conveying direction in a side view. 2. The decorative sheet coating apparatus according to claim 1, wherein air is blown toward the base end side in the direction. An apparatus housing having an internal space, wherein the blower device is disposed in the device housing, and the decorative plate is conveyed in the device housing under the blower device; In the housing, the base end side in the transport direction of the decorative plate is the front of the device housing, and the transport direction side is the rear of the device housing,
An exhaust-exclusive air communication passage disposed behind the blower and communicating between the inside of the device housing and the outside of the device housing; and an exhaust-only fan dedicated to exhaust,
3. The decorative board according to claim 2, further comprising exhaust means for exhausting the air in the apparatus casing to the outside of the apparatus casing through the exhaust exclusive air communication path when the exhaust exclusive fan is driven. Coating equipment.   The decorative device for a decorative board according to claim 2 or 3, wherein the blowing slit direction is set within an angle range of 20 to 30 ° in a plan view with respect to the first reference axis.   5. The air blowing direction according to claim 2, wherein the air blowing direction is inclined within an angle range of 15 to 35 ° toward the base end side in the transport direction in a side view with respect to the second reference axis. The coating apparatus for decorative boards as described in a term. The design surface coating means includes a paint tank having a slit opened in a lower portion thereof, and a paint supply means for supplying the paint to the paint tank, and the paint contained in the paint tank is contained in the paint tank. The overflow port that flows out of the tank is arranged at a higher position than the slit,
The paint is supplied into the paint tank by the paint supply means, and the paint flows out of the paint tank from the overflow port while the paint flows out from the slit. The coating apparatus for decorative boards as described in a term.   A decorative decorative board with a design surface is conveyed with the design surface facing upward, and the paint is naturally allowed to flow down in the form of a curtain onto the decorative surface of the decorative board, and the paint is applied to the decorative surface. The design surface is coated with a paint on the design surface by blowing air from above to blow off a part of the paint on the design plate to leave a required amount of the paint on the design surface. A decorative plate coating method comprising: forming a coating film having a predetermined thickness on the plate.   The air speed of the air is changed to increase or decrease the amount of paint sprayed on the design surface of the decorative board, thereby adjusting the coating thickness of the paint formed on the design surface. The decorative board coating method according to claim 7.

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