JP2007098334A - Curtain flow coater coating method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method enabling a coating which takes advantage of a high productivity of a curtain flow coater and enables a partial-coating of a coating object continuously conveyed, and which can save works such as a masking, and paints, and a device for the method. <P>SOLUTION: In the coating by the curtain flow coater, a blocking plate arbitrarily advancing or retracting against a falling curtain, and enabling a flow-down and shielding of the paint is provided. The blocking plate is taken in and out the paint curtain at an arbitrary position in a travel direction of the coating object, by which a coating start or coating stop can be carried out at the arbitrary position to allow a partial coating. The shielded paint is received with an auxiliary gutter, is recovered in a paint container, and reused. The advancement or retraction of the blocking plate is synchronized with a movement of the coated object, by which the predetermined coating position can be set. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a coating technique for partially applying a flow coater to expand the use of the flow coater coating, and particularly to a flow coater coating technique that enables partial coating in the traveling direction of an object to be coated. .

Flow coater coating is a method in which paint is flowed down with a thin film-like curtain and is applied to the object to be coated passing through the lower part of the curtain. Often used for painting of painted objects. This method has an advantage of enabling high-speed coating with high productivity by continuously transferring the object to be coated and continuously flowing down the paint curtain.

Accordingly, the object to be coated transferred on the conveyor is usually painted on the front surface. However, when it is sufficient to paint partially according to the painting requirement specification of the object to be painted, for example, in Japanese Patent Laid-Open No. 4-190876. As can be seen, it has been attempted to allow partial painting by blocking a portion of the paint curtain width and stopping the paint flow down.

However, intermittent coating with respect to the transfer direction of the object is not possible because the object and the paint flow continuously as described above, and the boundary line for partial coating is adjusted to the transfer direction of the object. It corresponds by that. However, the painting requirement may require partial painting in both the transfer direction and the direction intersecting with this. In such a case, mask the unnecessary parts in advance and remove the mask after painting. The method of completion was taken.

In this case, painting is possible, but it takes time to prepare, install, and remove the masking jig, and the paint applied to the masking jig is wasted, which wastes resources. This is not a favorable situation.

On the other hand, it is common for paint curtains to flow down continuously, but the work should be interrupted in response to various changes in the situation, such as failure or failure of the paint surface, or the paint flow may be temporarily stopped during maintenance. There is also. Therefore, in such a case, Japanese Utility Model Laid-Open No. 3-105968 discloses a means for stopping the painting by bypassing the paint curtain to another collection passage so as not to flow down to the object to be coated temporarily.
Japanese Patent Laid-Open No. 4-190876 Japanese Utility Model Publication No. 3-105968

The present invention makes it possible to partially paint a workpiece to be continuously conveyed by taking advantage of the high productivity of the flow coater, and in particular, enables partial painting with respect to the transfer direction of the workpiece. It is an object of the present invention to provide a method and an apparatus therefor that can be applied without masking and the like and waste of paint.

In addition, by appropriately coating and sorting according to the coating specifications of the mixed objects, such as transferring the objects to be sequentially transferred without stopping and transferring them as they are without painting when painting is unnecessary. Enables flow coater coating that can be applied to various types of coating.

In order to solve the above-mentioned problems, the present invention is applied to a coating by a flow coater that coats a coating material that is carried on a conveyor by passing it under a coating curtain that flows down from a head. A shielding plate that blocks the flow of paint is installed so that it can move forward and backward, and in conjunction with the movement of the object to be painted, the curtain is shut off to stop painting and enable partial painting. The coating material that is blocked by the interlocking moving shielding plate and flows down to the shielding plate flows into a basket that is integrated or provided together and is collected in a separately provided coating material container.

This shielding plate is set so that the paint curtain is shut off or opened at the position where the painting is interrupted or started by the driving means which is controlled in conjunction with the movement of the painting and flows down on the painting. .

In addition, the shielding plate is configured to be formed with a width that blocks a part of the paint curtain width, and by making the blocking position adjustable, partial coating along the transfer direction can be used together. The painting can be carried out with high efficiency without the need for masking or the like and the waste of paint with the same feeling as a normal flow coater painting.

As described above, the present invention cuts off all or part of the paint curtain in conjunction with the transfer of the object to be coated while continuously transferring the object to be coated and the flow of the paint curtain. In addition to improving the productivity, such as partial coating in the transfer direction of the coated object, eliminating the need for masking work on the unneeded parts, the paint on the unnecessary parts is not wasted, and only the necessary paint is available. Used to reduce paint.

In addition to partial coating, if the coating is not required depending on the object to be coated, it can be transported on the conveyor with the paint curtain shut off and sent to the next process, with different coating specifications. It is possible to flow the objects to be coated on the same line. As a result, for example, it is possible to arrange flow coaters of different paints in series, and paint different paints on the same line according to the object to be coated.

As described above, while being proud of its high productivity, the number of paintings that had been limited to large-scale continuous painting under the same painting conditions has increased depending on the setting, and has expanded to painting specifications that were not possible before. It is possible to take advantage of the great advantage of flow coater coating. The effects of other details will be described in the following embodiments.

1 and 2 are diagrams showing the overall configuration of a flow coater according to an embodiment of the present invention. FIG. 1 shows a state in which an object to be coated is cut off by a shielding plate and a rear part is not painted, and FIG. The state where the front part in the transfer direction of the coated object is painted is shown.

The article 1 is placed on the entrance conveyor 2 and sent to the exit conveyor 3 side. A head 4 for forming the paint curtain C is provided at the upper part of the two conveyors while maintaining a gap through which the paint curtain flows down. The paint is supplied from the paint container 6 through the filter 7 by the pump 5, flows down from the slit 41 provided at the lower end of the head, flows into the paint receiver 8 arranged at the lower part of the conveyor, and is collected in the paint container. A circulation path to be supplied to the head 4 by the pump is formed.

The head 4 is provided across the conveyor, and the slit 41 can be adjusted in slit width so that the film thickness of the paint curtain C can be changed depending on the coating conditions. The length of the slit determines the width of the paint curtain, and is required to be large enough to coat the article 1 that is placed on the conveyor 2 and transferred, and is not particularly limited.

In the present invention, a shielding plate 9 that blocks the flow of the paint curtain along the paint curtain C is provided between the slit 41 and the conveyor so as to be able to advance and retreat with respect to the curtain C. That is, the shielding plate 9 can be in the state shown in FIG. 1 in which the flow of the paint curtain is blocked, and in the state shown in FIG. 2 in which the paint retreats from the paint curtain and flows down to the paint receiver 8 below. Can move. The movement is performed in conjunction with the transfer conveyor, that is, the transfer of the object to be coated 1, and the paint curtain C flows down and is shut off.

These means are not particularly limited, and an actuator such as an air cylinder may be used, and a configuration may be adopted in which an operation is detected by a sensor when an object to be coated comes to a predetermined position. This makes it possible to interrupt or start application at a predetermined position on the object to be coated.

The shield plate 9 is provided with a gutter 10 integrally or in parallel with the shield plate 9, and is configured such that the paint whose flow is blocked flows into the gutter 10 from the shield plate 9. The basket 10 is connected to the paint container 6 by a recovery pipe 11 and used again. In the illustrated example, the shielding plate 9 moves so as to block the paint curtain C with respect to the fixed basket 10.

When the shielding plate 9 penetrates the paint curtain C and blocks it, the tip shape of the shielding plate 9 is formed in a sharp shape so that the disturbance of the paint curtain can be minimized. In addition, it is desirable to form the same shape as the trajectory to be moved so that the paint curtain is not disturbed by the accompanying airflow. In other words, it is possible to minimize disturbance by forming a flat plate when moving in parallel, and forming it in an arc shape when rotating.

As shown in the state of FIG. 2, the coating by the flow coater is usually applied to the object to be coated 1 if the object 1 is transferred while the paint curtain C is continuously flowing down, and the object to be coated is avoided. The paint that has flowed down is collected in the paint container 6. Here, as shown in FIG. 4, when only the front part is coated with respect to the traveling direction and it is desired to interrupt the painting of the rear part, the shielding plate 9 may be moved and blocked as shown in FIG. Since the blocking position changes depending on the transfer speed, the state of the paint curtain, etc., it is adjusted by an execution test or based on experience values.

In the partial painting as described above, if the painting specifications of the object to be painted are large objects such as building materials, the finish that requires the boundary between painting and non-painting can be satisfied, but more When it is desired to accurately form the boundary of the coating by precise coating, masking may be performed as is conventionally done. Even in this case, only a small amount of paint is applied to the masking material, and waste of the paint as in the past is eliminated.

Further, the example of FIG. 5 shows a case where a part S parallel to the transfer direction of the object to be coated is not painted and a part B is also unpainted in the front-rear direction. In this case, the shielding plate that shields the paint curtain may be configured to partially shield the width of the paint curtain, and a shape that does not shield the paint curtain on a part of the shielding plate so as not to paint the portion S in FIG. It becomes possible by means such as providing a notch in.

Further, in conjunction with the transfer of the object to be coated, the coating pattern can be created in a wide range by changing the shape of the shielding plate and setting the shielding range of the paint curtain. Further, by masking a range to be shielded in advance so that the width can be adjusted, or by having a structure that can be replaced with a shielding plate having a required width, various objects to be coated can be masked.

In these cases, measures are taken such that the end of the blocking portion is an edge or a coating treatment with a non-adhesive material is performed so that the paint does not sag or wrap around from the part of the shielding plate. Similarly, if the treatment is expanded on the surface of the shielding plate, the collection by the shielding is surely performed.

FIG. 6 shows a main part of an apparatus which is used for practical use as a specific embodiment, which improves the problem of details in carrying out the coating method. The head that forms the paint curtain C includes a fixed head 21 and a movable head 22, and includes a means capable of adjusting the clearance of the slit 23 and a configuration in which the movable head 22 can be opened to clean the inside. This structure is already widely used in known devices, and details are omitted.

The shielding plate 24 for blocking the paint curtain C is a plate having an arcuate cross section extending in parallel with the longitudinal direction of the paint curtain, and a rotating means 25 having a rotation center at the center X of the arc controls the arc motion. For example, it is configured to perform an arc motion by a servo motor or the like. The arc motion reciprocates between a position indicated by a solid line and a position indicated by a dotted line, and repeatedly flows down to the object to be coated by blocking and opening the paint curtain. The operating rod 26 connects the rotary shaft 25 and the shielding plate 24 at a position that does not hinder the flow of the paint curtain C.

The arc motion of the shielding plate is high in the productivity of the flow coater, the coating speed may exceed 1 m per second, and of course depends on the coating conditions of the object to be coated, but in a cycle of once or more per second. Movement may also take place. Accordingly, when the shielding plate is taken in and out of the paint curtain that flows down, the paint is unavoidably scattered due to the collision with the paint and the calling. In the embodiment, a tray 27 that receives forward scattering when shielding is disposed to prevent contamination of the entrance conveyor 2 and the object 1 to be coated placed thereon.

In addition, when the shielding plate 24 is pulled out from the coating curtain to flow the coating curtain to the object 1 to be coated, the coating curtain tends to be drawn to the shielding plate 24 due to the viscosity of the coating, and the coating liquid droplets are scattered in the outlet direction. For this reason, a fixed shutter 28 that protrudes to the immediate vicinity of the paint curtain that flows down is disposed, and its lower end flows into the tub 10.

If necessary, a fixed shutter sag receptacle 29 is disposed below the fixed shutter 28 so that it can be attached to the object to be coated 1 or the exit conveyor 3 by moving from the front end of the fixed shutter 28 to the lower surface. To prevent it.

Further, a U-shaped lip 30 is installed in the paint curtain side end of the ridge 10 so as to be able to be exchanged, thereby preventing dripping onto the object 1 to be conveyed due to the accumulation of the adhering paint.

Similarly, in order to prevent the paint from adhering to the outlet conveyor 3 to the maximum extent, the conveyor cover 31 is also detachably arranged. In the example shown in the figure, it is formed so as to be fitted to the leading edge of the paint receiver 8, but any other known technical means may be used as long as it can restrict the adhesion of the paint to the conveyor 3. The tray 27, the fixed shutter 28, the fixed shutter drooping receptacle 29, the U-shaped lip 30, and the conveyor cover 31 are all provided in parallel with the paint curtain over a range that can sufficiently cover the width of the paint curtain.

In addition, it is important to prevent the paint curtain in the flow coater from being shaken not only in the implementation of the present invention, but it is possible to improve the implementation effect of the present invention by preventing it more strictly. In the example, a cover 32 is provided immediately near the entrance side of the paint curtain, and a windshield cover 33 of the entire apparatus is provided on the exit side. The cover 32 in this embodiment is provided in the immediate vicinity of the paint curtain as an example. However, if the paint is scattered and adhered by the movement of the shielding plate, it may sag and cause a problem. Depending on the case, it is possible to expand the range to be considered to the same position as the windshield cover 33.

The outline figure explaining the state of implementation where the paint curtain was cut off and partial painting was done with the flow coater of the present invention The schematic diagram showing the state when the paint curtain is made to flow down on the object to be coated in the flow coater of the present invention FIG. 2 shows a partial view of the shielding plate portion of FIG. 1 viewed from the outlet side. Schematic diagram showing paint curtain shielding and coating area. The schematic diagram which shows the shielding range of a paint curtain and the coating range to a to-be-coated object as another example. Partial explanatory drawing which shows the principal part of the apparatus provided for practical use as an Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Object to be coated 2 Inlet conveyor 3 Outlet conveyor 4 Head 5 Pump 6 Paint container 7 Filter 8 Paint receiver 9 Shield plate 10 樋 23 Slit 24 Shield plate 25 Rotating shaft 26 Actuator 杆 27 Tray 28 Fixed shutter 29 Fixed shutter sag receiver 30 U Shaped lip 31 Conveyor cover 32 Cover 33 Windshield cover

Claims (5)

In the coating with a flow coater that coats the paint to be transported on the conveyor by passing it under the paint curtain flowing down from the head, it is possible to advance or retract the shielding plate that blocks the paint flow from the lower surface of the paint curtain. A flow coater coating method, which is installed in the system to block and flow down the paint curtain in conjunction with the transfer of the object to be painted. In a flow coater coating device, a narrow slit is formed in the direction intersecting the traveling direction of the conveyor for transferring the object to be coated, the paint is allowed to flow down in a curtain shape, and the object to be coated passing under the paint curtain is applied to the flow coater coating apparatus. A shielding plate is provided in the middle of the paint curtain to move forward and backward in the same direction as the direction of the object to be coated to shut off and flow down the paint curtain, and the shielding plate receives the paint received when the paint curtain is shut off. A flow coater coating apparatus characterized by a driving means for controlling the shield plate in conjunction with the transfer of an object to be coated, provided with a ridge that is returned to the paint container integrally or side by side. The flow coater coating apparatus according to claim 2, wherein the shielding plate forms an arc-shaped cross section, and the arc motion is performed by a driving unit having a center of the arc as a rotation axis to block the paint curtain. The flow coater coating apparatus according to claim 2, wherein a fixed shutter is provided below the shielding plate on the side where the shielding plate is retracted from the paint curtain, and a tub through which the paint flows through the fixed shutter is provided. The flow coater coating apparatus according to claim 2, wherein the shielding plate is formed with a width that blocks a part of the paint curtain width, and the blocking position is assembled to be adjustable.

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