JPH0642770Y2 - Curtain control device in curtain coater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a curtain coater for forming a coating film on an object to be coated by passing the object to be coated through a curtain of paint flowing down.

[Prior Art] FIG. 3 is a schematic view of a curtain coater for a cutting board.
The coating material 2 stored in the coating head 1 flows down from a slit 3 provided at the lower end of the coating head 1 to form a coating material curtain 4. A cut plate 5 is placed on the belt conveyors 6-1 and 6-2 and moves in the direction of arrow 7 to form a coating film 8 on the cut plate 5 when passing through the curtain 4.
Reference numeral 9 denotes a paint collecting pan for collecting the curtain flow paint when the cut plate does not pass, as shown in FIG. 3 (A). However, the curtain coater shown in FIG. 3 is not suitable as a curtain coater for strip steel plates because it does not have a curtain blocking device or a device for receiving droplets.

FIG. 4 is a schematic view of an example of an apparatus for forming a coating film on a strip steel plate. The strip steel plate 10 travels in the direction of arrow 7 by the rotation of the take-up reel 11 and the rewind reel 12, and forms a coating film 8 on the surface of the strip steel plate 10 when passing through the curtain 4. When the coil 13 having the coating film 8 formed thereon is wound into a predetermined size, the coil 13 is cut in the vicinity 14 of the take-up reel 11, and the coil 13 is taken out from the take-up reel 11 to be taken up by the take-up reel 11. Is wrapped around the other cut end of the strip. This removal of the coil 13 is usually performed by temporarily stopping the traveling of the strip steel plate 10. However, in the case of strip steel, as shown in FIG.
Since there is always a strip steel plate below the curtain 4,
In the coating head 2 of FIG. 3, the slit 3 does not close, so in FIG. 4 (A), when the strip steel plate 10 stops traveling, the paint of the curtain 4 flows down and accumulates on the strip steel plate,
There is a problem that the deposited paint 15 is generated.

Japanese Patent Publication No. 60-22984 discloses a coating head in which the slit 3 is closed, and a droplet receiver 17 for receiving a droplet 16 dropped from the slit 3 after the slit 3 is closed.
Is listed. It is stated that the droplet receiver 17 is moved and set in the direction of the arrow 18. Figure 4 (B) shows
This is an example in which a curtain coater made of a strip-shaped steel plate receives the coating head and the droplet receiver 17 of the invention described in Japanese Patent Publication No. 60-22984. By using the curtain coater shown in FIG. 4 (B), even if the traveling of the strip steel plate 10 is stopped, it is possible to prevent the deposition paint 15 from being generated.

FIG. 4 (C) shows a state in which the strip-shaped steel sheet has started to travel and the coating has started after the coil has been replaced. At this time, the droplet receiver 17 is moved and retracted, and the slit 3 of the coating head is opened to form the curtain 4. According to the knowledge of the present inventors, when forming a thin film curtain, it is necessary to make the curtain thick at first and gradually adjust it to a desired curtain thickness.
Immediately after opening the curtain, it is difficult to form the curtain 4 having a uniform thickness. Therefore, in the curtain coater of FIGS. 4 (B) and (C), the coating film 8 formed on the strip-shaped steel sheet immediately after the start of coating has a non-uniform thickness if the above adjustment is not performed. There is a problem that it becomes a coating film.

[Problems to be solved by the invention] In Fig. 4, the stop and start of the strip-shaped steel sheet are explained by using the coil exchange as an example. For example, at the start and end of daily operation, when changing the paint, or when changing the line. There are many opportunities to stop and start the strip steel when inspecting and repairing.

The present invention is a curtain coater for forming a coating film on a strip-shaped steel sheet, and when the strip-shaped steel sheet is stopped or started, the coating material 15 shown in FIG. 4 (A) and the coating material 15 shown in FIG. 4 (C) are formed on the strip-shaped steel sheet. An object of the present invention is to provide a curtain control device which does not form a coating film having a non-uniform thickness shown in Fig. 4 or a coating film defect such as stains caused by the paint droplet 16 to be dropped shown in Fig. 4B. There is. At the same time, another object of the present invention is to provide a curtain control device having a simple structure and easy handling.

[Means and Actions for Solving the Problems] The present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic diagram in which the curtain control device of the present invention is used in a roll curtain coater. A coating roll 23 rotates in the direction of arrow 24. 25 is a doctor roll and arrow 26
Rotate in the direction. The paint 2 stored between the coating roll 23 and the doctor roll 25 is
By the rotation of the coating roll 23, it is discharged downward along the roll surface of the coating roll 23 from the gap between the coating roll 23 and the doctor roll 25. Reference numeral 27 denotes a blade arranged in the axial direction of the coating roll 23 to scrape the coating material from the surface of the coating roll 23 to form a curtain 4 of coating material and to flow it down. In this roll curtain coater, the curtain 4 having a desired film thickness can be obtained by adjusting the rotation speed of the coating roll 23 and the gap between the coating roll and the doctor roll. Therefore, for example, a curtain used when coating a strip steel sheet. Preferred as a coater. Note that FIG. 1 (B) is a schematic diagram when the traveling of the strip-shaped steel sheet is stopped.

In FIG. 1 (A), the strip-shaped steel plate 10 travels in the direction of the arrow 7, but a coating film 8 is formed on the strip-shaped steel plate when passing through the paint curtain 4 that flows down. In the figure, 20 is the reversal plate of the present invention, which can be set in the curtain flow-down state shown in FIG. 1 (A), and by changing the angle in the direction of arrow 19 to set the position in FIG. It is also possible to set the position to the curtain cutoff state shown in B). In the figure, 21 is the paint receiver of the present invention,
Reference numeral 22 denotes a droplet receiver of the present invention, which is disposed at fixed positions on both sides of the curtain flow-down position with the flow-down position of the curtain 4 interposed therebetween.

Now, when the running of the strip steel plate is stopped, in the case of FIG. 4 (B) described above, the slit 3 is closed to stop the flow of the curtain 4, but in the present invention, the flow of the curtain 4 is stopped. Without doing so, it is possible to set the reversing plate 20 to the curtain blocking state. At this time, the paint flowing down on the curtain 4 flows on the reversing plate 20 and flows into the paint receiver 21. Therefore, the curtain 4 does not flow down onto the strip steel plate 10, and the fourth
The deposited paint 15 shown in FIG. 1A is not formed on the strip steel plate 10.

When the strip steel plate starts traveling, the position of the reversing plate 20 is changed from the curtain cut-off state shown in FIG. 1 (B) to the curtain flow-down state shown in FIG. 1 (A). Due to this change in the position setting, the curtain 4 flows down onto the strip-shaped steel plate 10 to form the coating film 8 on the traveling strip-shaped steel plate 10. Immediately after the position setting of the reversing plate 20 is changed as shown in FIG. 1A, the droplet 16 of the paint adhering to the reversing plate 20 is dropped, but the droplet 16 is received by the droplet receiver 22. Therefore, the strip-shaped steel sheet 10 is not dropped, and therefore, the strip-shaped steel sheet 10 is free from stains due to the dropping of the droplets of the paint.

In the present invention, the curtain 4 having a uniform film thickness is continuously formed while the strip steel plate 10 is stopped. Therefore strip steel plate
Immediately after the running of 10 starts, the curtain 4 having a uniform film thickness flows down on the strip-shaped steel plate 10, so that a uniform coating film 8 is formed on the strip-shaped steel plate 10 simultaneously with the start of running.

More preferably, the reversing plate 20 is provided with an extension 20 'above the rotation shaft 28. This is because, when the extension portion 20 'is provided, the wind (which is generated by the rotation of the coating roll 23) flowing from the direction of the doctor roll 25 toward the curtain 4 through the gap between the rotary shaft 28 and the coating roll 23 is blocked. ,
This is because the stable flow of the curtain 4 can be maintained. However, the length of the extension portion 20 'needs to be in a range that does not come into contact with the coating roll 23 and the coating material carried on the surface of the roll even when the reversal plate is rotated. Is big.

In FIG. 4 (B), the droplet receiver 17 is set by moving in the direction of the arrow 18, but in the present invention, the paint receiver 21 and the droplet receiver 22 are such that the paint flows into a predetermined position and the droplet is a predetermined position. It can be placed in a fixed position for dropping to a position, and the structure is simple because it does not move.

In addition, the inventors of the present invention have studied various methods of applying the curtain 4 to the strip-shaped steel plate 10 below, and as a result, as shown in FIG.
Compared with the method in which the curtain 4 is moved horizontally and collides with the curtain to cause curtain breakage or lateral shake, the curtain 4 is guided downward by using the reversing plate 20 as in the present invention. It has been found that it becomes difficult to break and a stable falling state toward the strip-shaped steel sheet 10 can be secured.

The example in which the curtain control device of the present invention is used for the roll curtain coater has been described above. However, since the present invention does not hinder the formation of the curtain 4, the same applies to the slit curtain coater of FIG. It is clear from the above description that the action and effect are exhibited.

Further, the curtain control device of the present invention is used, for example, in the curtain coater of the cut plate shown in FIG. 3, and when there is an object to be coated passing through the curtain 4, the curtain 4 as shown in FIG.
When there is no object to be coated that passes through the curtain 4, if the curtain is cut off as shown in FIG. 1 (B), a coating film is also formed on the cutting plates 5 which are successively conveyed with a gap. I can do things.

As described above, the present invention is a control device for controlling the flow and blocking of a curtain in a curtain coater that forms a coating film on an object to be coated by passing the paint curtain that is flowing down, and changes the angle to set the curtain blocking state. It has a reversing plate 20 whose position can be set in the curtain flow-down state, and the paint receiver 21 and the reversing plate 20 which flow in the paint flowing down from the reversion plate 20 when the reversing plate 20 is set in the curtain shut-off state The droplet receiver 22 for receiving the paint dropped from the reversing plate 20 when set to the state is arranged on the different side across the flow-down position of the curtain 4, and the reversing plate 20 and the droplet receiver 22 are arranged on the same side. A curtain control device in a curtain coater, characterized in that an object to be coated is made to pass below a paint receiver 21 and a droplet receiver 22.

[Embodiment] FIG. 2 is an explanatory view in which the present invention is applied to a curtain coater in actual operation, and FIG. (A-1) is a front view in which a coating film 8 is formed on a surface of a strip-shaped steel plate 10 during traveling. In the figure, (A-2) is (A
-1) It is a left side view of the figure. In the example of FIG. 2, the curtain 4
Since the width W ₁ of the strip 4 is larger than the width W ₃ of the strip steel plate 10, the portion of the curtain 4 that flows down onto the strip steel plate 10 forms the coating film 8, but the curtain that does not flow down onto the strip steel plate 10 Directly flow down to the paint recovery pan 9. The paint that has flowed into the paint collecting pan 9 is collected and reused again as the paint that forms the curtain 4.

In FIG. 2, (B-1) is a front view when the traveling of the strip steel plate 10 is stopped, and (B-2) is a left side view of (B-1). In the present invention, the reversing plate 20 has the width W ₂ of the strip steel plate 10
Be sure to use a width wider than W ₃ . The width W ₂ of the reversal plate 20 may be larger than the width W _{1 of the} curtain 4 or smaller than W ₁ . When the strip steel plate 10 is stopped, the reversal plate 20 is set to the curtain blocking state shown in FIG. With this position setting, the curtain 4 that has flowed down on the strip-shaped steel plate 10 flows down on the reversal plate 20, and the paint further flows into the paint receiver 21, reaches the paint collecting pan 9, and is then collected. The curtain of the paint that does not flow down on the reversing plate 20 flows down directly to the paint collecting pan 9.

[Advantage of the Invention] When the curtain control device of the present invention is used, in a curtain coater that forms a coating film on a strip-shaped steel sheet, when the strip-shaped steel sheet is stopped or started to travel, the coating material 15 or the like is deposited on the strip-shaped steel sheet. A stain due to paint droplets is not generated, and a coating film having a uniform thickness is formed at the start of running at the same time as running. The curtain control device of the present invention has a simple structure because a certain effect can be obtained by a simple operation of changing the angle of the reversing plate and setting the position, and the number of movable parts is small.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a curtain control device of the present invention, FIG. 2 is an explanatory diagram of an embodiment, FIG. 3 is a schematic diagram of a curtain coater for a cutting plate, and FIG. 4 is a coating film formed on a strip steel plate. FIG. 1: Coating head, 2: Paint, 3: Slit, 4: Curtain, 5: Cut plate, 8: Paint film, 9: Paint recovery pan, 10: Strip steel plate, 1
5: deposited paint, 16: droplet, 17: moving droplet receiver, 20: reversal plate, 21: paint receiver, 22: droplet receiver.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimichi Murata 1 Kimitsu, Kimitsu-shi, Chiba Shin Nippon Steel Co., Ltd. Kimitsu Steel Co., Ltd. (72) Inventor Osa Renji Kimitsu, Chiba, Chiba Prefecture Shin-Nihon Kimitsu Works, Ltd. (56) References Japanese Patent Publication Sho 49-24133 (JP, B1)

Claims (1)

[Scope of utility model registration request] 1. A curtain coater for forming a coating film on an object to be coated by passing through a paint curtain flowing down, which is a control device for controlling the flow down and interruption of the curtain, the curtain being changed in angle below a rotation axis. It has a reversing plate whose position can be set to the shut-off state and the curtain flow-down state, and when the reversing plate is set to the curtain shut-off state, a paint receiver for inflowing the paint flowing down from the reversing plate and a curtain flow-down for the reversion plate The droplet receiver that receives the paint dripping from the reversing plate when it is set to the state is placed on the different side across the curtain flow-down position, and the reversing plate and the droplet receiver are arranged on the same side. A curtain having a structure in which it passes below the receiver and the liquid drop receiver, and an extension is provided above the rotation axis of the reversing plate in order to prevent the curtain from shaking from the inflowing wind. Curtain control device in Ta.