JP2510884B2 - Flow coater conveyor - Google Patents

Description

TECHNICAL FIELD The present invention relates to an article conveying device for a flow coater.

[Prior Art] A conventional flow coater 1 as shown in FIG. 3 is provided with a front conveyor 4 for transporting an object to be coated 3 before and after a coating area where a paint curtain flowing down from a paint supply header 2 hangs down. And the rear conveyor 5 are spaced apart from each other. At this time, transition guides 6 made of a metal or resinous plate material having a thickness of about 0.2 mm are installed at a plurality of positions in the width direction of the coating area between the two conveyors 4 and 5 to support the article to be coated 3. .

That is, in the flow coater 1, the conveyors 4, 5
The coating material 3 conveyed by is passed through the paint curtain at a high speed of 120 to 150 m / min, and the coating material 3 is coated on the transfer guide 6. The transfer guide 6 is arranged above the paint tray 7.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional flow coater, since the coating is performed in the area where the lower surface of the article to be coated does not have a conveyor, the supporting state of the article to be coated during coating becomes unstable. It tends to occur, and the vibration of the article to be coated as shown in FIG. 5 causes a difference in coating thickness in the longitudinal direction of the article to be coated, resulting in uneven color.

FIG. 4 is a schematic view showing a state where color unevenness occurs in the longitudinal direction of the article to be coated.

In addition, in particular, in a coated plate using a transparent coloring paint that makes the best use of the background of an object to be coated such as a steel plate, a slight film thickness difference (for example, ± 2 μm for the total film thickness of 20 μm) is observed as color unevenness. .

SUMMARY OF THE INVENTION It is an object of the present invention to suppress unevenness in coating film thickness variation and prevent color unevenness during coating with a flow coater.

[Means for Solving the Problems] The present invention provides a flow coater to be coated, in which a front conveyor and a rear conveyor for transporting the coating are separated from each other before and after the coating region where the coating curtain hangs. In the transport device, in the area close to the coating area of the front and rear conveyors,
An adsorption device for adsorbing and fixing an object to be coated on the conveyor surface of the conveyor to the conveyor surface is provided.

[Operation] As a result of the experiments conducted by the present inventor, it is found that the vibration that causes the coating color unevenness and that occurs in the coating object in the coating region is not the vibration of the conveyor rotating system but the natural vibration of the coating object. Was found (the vibration generated on the coated object is independent of the conveyor speed,
It has a constant frequency, and the distance between the rotation axes of the front and rear conveyors is the vibration span). It was found that the relative relationship between the vertical speed of the vibration and the falling speed of the paint curtain causes a paint film thickness difference, resulting in uneven color.

Therefore, in the present invention, in order to suppress the natural vibration of the object to be coated (to reduce the amplitude and increase the frequency), a suction and fixing function of the object to be coated is added to the conveyor before and after the coating area. .

That is, according to the present invention, both ends of the object to be coated passing through the coating area are sucked and fixed to the conveying surfaces of the front and rear conveyors to restrain the vibrating end of the object to be coated from the free end to the fixed end. It will be possible to pass the board in the state of turning on. This allows
It is possible to suppress the vibration of the object to be coated, and as a result, suppress the occurrence of a coating film thickness difference in the longitudinal direction due to the vibration and prevent the occurrence of color unevenness.

[Embodiment] FIG. 1 is a side view showing a flow coater according to an embodiment of the present invention, FIG. 2 is a diagram showing a vibrating state of an object to be coated according to the present invention, and FIG. 3 is a flow coater of a conventional example. FIG. 4 is a schematic diagram showing a color unevenness generation state of the coated object, and FIG. 5 is a diagram showing a vibrating state of the coated object according to the conventional example.

The flow coater 11 includes a front conveyor 14 and a rear conveyor 15 for transporting an object 13 to be coated before and after a coating area where a paint curtain flowing down from a paint supply header 12 hangs.
And are separated from each other. At this time, at a plurality of positions in the width direction of the coating area between the conveyors 14 and 15, a transition guide 16 made of a metal or resin plate material having a thickness of about 0.2 mm is installed to support the article to be coated 13. There is.

The crossover guide 16 has a concave portion 16C at a portion corresponding to the paint curtain, a front top surface 16A and a rear top surface 16B are provided in front of and behind the concave portion 16C, and the top surface 16A and 16B support the article to be coated 13. To do. At this time, the top surface levels of the top surfaces 16A and 16B of the transition guide 16 are set to be slightly higher than the transfer surface levels of the front and rear conveyors 14 and 15, so that the article 13 to be coated in this portion is lifted up and down. The article 13 to be coated is provided with a tension so that the article 13 to be coated is stably supported. The concave portion 16C is the object to be coated 1
This is for preventing the paint that drops and adheres when 3 is not in the painting area from being transferred to the back surface of the article to be coated 13.

That is, in the flow coater 11, the article to be coated 13 conveyed by the conveyors 14 and 15 is passed through the paint curtain at a high speed of 120 to 150 m / min, and the article to be coated 13 is coated on the migration guide 16. Give. The crossover guide 16 is arranged above the paint tray 17.

However, in the flow coater 11, the front and rear conveyors
Adjacent suction devices 21 and 22 for adsorbing and fixing the article to be coated 13 on the transport surfaces of the conveyors 14 and 15 to the transport surfaces of the conveyors 14 and 15 are provided at positions close to the coating areas of the conveyors 14 and 15.

The suction devices 21 and 22 are arranged such that a vacuum suction box 32 is arranged on the back surface of the conveyor belt 31 under the condition that the conveyor belt 31 in a porous state is used, thereby exerting the suction force on the conveying surface of the conveyor belt 31. Configured to get.

The suction method of each of the suction devices 21 and 22 is not limited to the vacuum suction method, but may be a magnetic suction method or the like.

 The operation of the above embodiment will be described below.

The flow coater 11 is provided with the suction devices 21 and 22, and by sucking and fixing the both ends of the article to be coated 13 that passes through the coating region to the transport surfaces of the front and rear conveyors 14 and 15, it is possible to restrain. The vibrating end of the article to be coated 13 is changed from the free end to the fixed end, and the article to be coated 13 is crossed over and the front and rear surfaces 16 of the guide 16 are crossed.
It will be possible to pass the plate while pressing it against A and 16B. As a result, the vibration of the article to be coated 13 is suppressed as shown in FIG. 2, and as a result, it is possible to suppress the occurrence of the coating film thickness difference in the longitudinal direction due to the vibration and prevent the occurrence of color unevenness.

FIG. 2 shows the vibration-reduced state of the article 13 to be coated, and it was confirmed that no color unevenness was caused in the example of the present invention.

As described above, a slight difference in film thickness is observed as color unevenness in a coated article using a transparent colorant that makes the best use of the background of the coated article such as a steel plate. Therefore, the present invention is extremely useful in coating such a high-quality coated plate having a high design property with a flow coater.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent variations in coating film thickness difference and prevent color unevenness from occurring during coating with a flow coater.

[Brief description of drawings]

FIG. 1 is a side view showing a flow coater according to an embodiment of the present invention, FIG. 2 is a diagram showing a vibrating state of an article to be coated according to the present invention, and FIG. 3 is a side view showing a flow coater of a conventional example. , 4th
FIG. 5 is a schematic diagram showing a color unevenness generation state of an object to be coated, and FIG. 5 is a diagram showing a vibration state of the object to be coated according to a conventional example. 11 ... Flow coater, 12 ... Paint supply header, 13 ... Substrate,
14 ... Front conveyor, 15 ... Rear conveyor, 21, 22 ... Adsorption device.

Claims (1)

(57) [Claims] 1. A coating material conveying device for a flow coater, comprising a front conveyor and a rear conveyor for conveying an object to be separated before and after a coating area where a paint curtain hangs. In the area close to the painting area,
An object transfer device for a flow coater, comprising an adsorption device for adsorbing and fixing an object on the transfer surface of the conveyor to the transfer surface.