JPH078878A - Roller curtain coater device - Google Patents

Abstract

PURPOSE:To prevent non-baking, etc., of a thick film part by drying and baking in an oven and to eliminate the induction of a line trouble by correcting the thick film part of the coating material to be generated at the time of changing a coating material curtain between a down flow state and a shut off state to an adequate film thickness or below. CONSTITUTION:The coating material 8 is discharged downward from the spacing between a rotating coating roll 1a and a doctor roll 1b. The discharged coating material 8 is scraped off by a blade 2 and is made to flow down by forming the coating material curtain 7; thereafter, the coating material is applied on the front surface of the traveling material 6 to be coated. A coating material receiving pan 3 is retreated by a forward and backward moving mechanism 4 to change the coating material curtain 7 from the shut off state to the downflow state at the time of starting the coating. The shutter 41 is retreated by the forward and backward moving mechanism 42. Further, a leveling off roll 11 is lowered by a lifting mechanism 12 thereof and is brought into contact with the material 6 to be coated. The thick film part 9 at the front end of beginning of the coating of the material 6 to be coated is leveled off by the leveling off roll 11 and is thereby thinly leveled off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller curtain coater device having a belt-shaped body as an object to be coated.

[0002]

2. Description of the Related Art Conventionally, a slit method and an overflow method are known as a coating technology by curtain flow. For example, the slit method supplies paint to the head,
Discharge from the slit gap to make a curtain shape. In this method, the paint viscosity and slit spacing are adjusted to obtain a predetermined coating film thickness. Further, in the overflow method, while the paint is diluted with a solvent, properties such as surface tension and viscosity of the paint are changed to adjust the paint viscosity to an appropriate value, and the paint is overflowed from a container to form a curtain. In this method, the coating viscosity is adjusted to obtain a predetermined coating film thickness.

Further, in recent years, a roller type curtain coater (roller curtain coater) has been developed,
This roller curtain coater discharges the paint whose viscosity has been adjusted beforehand as needed from the paint supply device located on the upper part of the roll between the rubber or metal coating roll and the metal doctor roll, and makes it contact the coating roll. Scrape with a blade. The scraped paint is a method of flowing down along a blade to form a paint curtain, and applied to a steel plate or the like passing below the blade.

A conventional roller curtain coater device is shown in FIG.
Shown in. The paint discharged from the paint supply device (not shown) is stored between the coating roll 1a and the doctor roll 1b, and the rotation of the coating roll 1a causes the gap between the coating roll 1a and the doctor roll 1b to reach the surface of the coating roll 1a. Is discharged downwards. Reference numeral 2 denotes a blade arranged in the axial direction of the coating roll 1a, scraping the coating material from the surface of the coating roll 1a to form a coating curtain 7 and allowing the coating material 6 which has been run to fall freely from above the steel plate. Is painted. The remaining paint scraped off by the blade is stored in a paint tank (not shown) provided in the lower part.

This roller curtain coater uses the rotation speed of the coating roll 1a, the coating roll 1a and the doctor roll 1
The paint curtain 7 having a desired film thickness can be obtained by adjusting the gap with b. As described above, the curtain coating device is constituted by a device for performing free coating by dropping the paint curtain 7 from above the steel plate which is the object 6 to be coated.

With this structure, when the coating of the object to be coated 6 is started or when the coating is interrupted or finished, the paint receiving pan 3 is moved backward and forward by using the paint receiving pan forward / backward moving mechanism 4. The paint curtain 7 is changed from the blocking state to the flowing-down state or from the flowing-down state to the blocking state by advancing (on the opposite side of the coating material curtain 7) or moving forward (on the coating material curtain 7 side), but the coating material curtain 7 is being blocked (not being coated). Receives all of the paint curtain 7 in the paint receiving pan 3. The paint in the paint receiving pan 3 is connected to the paint discharge port 5 from the lower part of the paint receiving pan 3 so that the paint is discharged. In addition, conventionally, in reality, the paint receiving pan 3, the paint receiving pan forward / backward moving mechanism 4, and the paint discharge port 5 are included in one unit.

[0007]

When the coating of the object to be coated 6 is started or the coating is interrupted or ended by the above-mentioned roller curtain coater device, the paint receiving pan 3 is moved backward and forward by using the forward / backward moving mechanism 4. (The opposite side of the paint curtain 7)
Alternatively, the paint curtain 7 is moved forward (on the side of the paint curtain 7) to change the paint curtain 7 from the blocked state to the flow-down state or from the flow-down state to the blocked state. The tip (paint curtain 7 side) drags the paint curtain 7, and when the viscosity is low, the curtain 7 is torn off from the central part of the dragged portion and falls in a thick film state, or when the viscosity is high, the paint curtain 7 The thick-film-state paint that has been dragged and separated from the tip of the paint-receiving pan 3 falls on the object 6 to be coated, and forms a thick-film portion (a coating-starting tip thick-film portion 9 at the start of coating). The thick film portion 9 may cause armpits in subsequent drying / baking in an oven, or may become unbaked when the film thickness is very thick, and stain the inside of the oven to cause a poor paint appearance of the article 6 to be coated. Alternatively, the line roll after the oven was contaminated, which often caused a line trouble.

Further, as in Japanese Patent Application No. 4-19761, the shape of the cut portion of the paint curtain 7 at the tip of the paint receiving pan 3 (on the side of the paint curtain 7) has an internal angle of 90 to 180 ° or a smooth circular inclined shape. Although there is a proposal to make it, the optimum shape of this shape differs depending on the physical properties of the paint and the thickness of the paint curtain 7, and the optimum shape is obtained for a certain paint physical property and the thickness of the paint curtain 7. Also, generally, the same roller curtain coater performs various types of coating, for example, from low viscosity to high viscosity in viscosity, or from thin film to thick film in terms of coating thickness. The tip shape of the paint receiving pan 3 needs to be replaced, and the work is complicated and impractical.

In order to solve such a problem, the present invention does not cause a line trouble after the oven for the thick film portion of the paint which occurs when the paint curtain is changed from the blocking state to the flowing state or from the flowing state to the blocking state. An object of the present invention is to provide a roller curtain coater having a mechanism for correcting the film thickness to an appropriate film thickness or less.

[0010]

SUMMARY OF THE INVENTION The present invention advantageously solves the problems of the prior art, and as a result of the inventors' earnest efforts to achieve the above object, the paint curtain was cut off from the blocked state. An apparatus capable of correcting a thick film portion of a paint generated when changing to a flowing-down state or from a flowing-down state to a blocking state to an appropriate film thickness or less so as not to cause a line trouble after an oven. (1) In a roller curtain coater device for forming a coating film by passing a paint curtain flowing down an object to be coated, a forward / backward moving mechanism and a paint outlet are provided between a blade and the object to be coated. A curtain film receiving device is provided, and a paint film leveling device having a shutter having an elevating function on the advancing direction side of the object to be coated and a forward / backward moving mechanism at the bottom is provided. That the roller curtain coater apparatus,
(2) A roller curtain coater device according to (1), characterized in that a leveling device having a roll structure is provided.
(3) A roller curtain coater device according to (1), characterized in that a leveling device having a blade structure is provided.
(4) It is characterized in that a cleaning pan is provided which allows the paint cleaning liquid to be applied to the leveling device before use (1)
The roller curtain coater device described in 1.

[0011]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a diagram immediately after the start of coating of a roller curtain coater apparatus according to the roll leveling method of the present invention. The paint stored between the coating roll 1a and the doctor roll 1b is discharged downward along the surface of the coating roll 1a from the gap between the coating roll 1a and the doctor roll 1b by the rotation of the coating roll 1a. The discharged coating material is scraped off from the surface of the coating roll 1a by the blade 2 to form a coating material curtain 7 and is flown down, and the coating material curtain 7 is allowed to fall freely from above the steel plate which is the traveling object 6 to be coated. The surface of the steel sheet is painted.

A paint receiving pan 3 having a paint receiving pan forward / backward moving mechanism 4 is provided between the blade 2 and the steel plate which is the object 6 to be coated.
Are arranged. Further, a roll leveling device is arranged in the traveling direction of the object 6 to be coated. The roll leveling device includes a leveling roll driving device including a leveling roll 11, a leveling roll elevating mechanism 12 and a leveling roll forward / backward moving mechanism 13, a cleaning roll 14, a cleaning pan 15, a cleaning liquid supply port 16, and a cleaning liquid discharge port 17. And a leveling roll cleaning facility including a shielding plate 31 for preventing the scattering of the cleaning liquid, and a facility for preventing paint from falling onto the object to be coated 6 from the leveling roll including a shutter 41 and a shutter forward / backward moving mechanism 42.

Before the start of coating, that is, while the paint curtain 7 is shut off, the paint curtain 7 is received by the paint receiving pan 3 advanced by the paint receiving pan forward / backward moving mechanism 4, and the paint in the paint receiving pan 3 is received by the paint receiving pan 3. Paint outlet 5 from the bottom of pan 3
The paint is discharged by being connected to and is prevented from falling onto the object 6 to be coated. Further, the leveling roll 11 is lifted up and retracted by the leveling roll lifting device 12, and the shutter 41 is moved forward by the shutter forward / backward moving mechanism 42 between the leveling roll 11 and the object 6 to be coated. Therefore, the paint that has adhered to the leveling roll 11 does not fall onto the article 6 to be coated. At this time, the leveling roll 11 is immersed in the cleaning pan 15 as necessary, or the shutter 4
Located at the top of 1.

When the coating is started, the paint receiving pan 3 is moved backward by using the paint receiving pan forward / backward moving mechanism 4, and the paint curtain 7 is changed from the shut-off state to the downflow state.
At this time, the tip of the paint receiving pan 3 (on the side of the paint curtain 7) drags the paint curtain 7, and if the viscosity of the paint is low, the curtain is torn off from the central part of the dragged part and falls in a thick film state or the paint of high viscosity. Then, the paint curtain 7 is further dragged, and the paint in the thick film state separated from the tip of the paint receiving pan 3 falls onto the object 6 to be coated to form the thick film portion 9 at the start of painting.

Before the coating start tip thick film portion 9 reaches the position of the leveling roll 11, the shutter 41 is retracted by the shutter forward / backward moving mechanism 42, and the leveling roll 11 is lowered by the leveling roll lifting device 12. It is in contact with the object 6 to be coated. When the coating start tip thick film portion 9 reaches the leveling roll 11, it is leveled between the leveling roll 11 and the object to be coated 6 and the film thickness does not cause armpits by drying / baking in an oven or do not cause unburning. Lightly averaged and goes out from the leveling roll 11. After that, the leveling roll 11 is moved upward by the leveling roll elevating device 12 and retracted, and the shutter 41 is moved forward by the shutter forward / backward moving mechanism 42 between the leveling roll 11 and the object 6 to be coated. The paint that has adhered to the leveling roll 11 does not fall onto the article 6 to be coated.

The leveling roll 11 to which the paint is attached is washed as needed. Any cleaning method may be used,
For example, the leveling roll 11 is retracted by the leveling roll forward / backward moving mechanism 13, retracted to the upper part of the cleaning pan 15, and further lowered by the leveling roll elevating device 12 to the intermediate height (cleaning height) position, and the cleaning liquid 18 The cleaning roll 14 is driven, and the leveling roll 11 and the cleaning roll 14 are brought into contact with each other and driven to be cleaned. Further, since the shielding plate 31 is arranged below the cleaning pan 15, the cleaning liquid does not drop on the object 6 to be coated. Note that this work may be automatic or manual.

In this way, the thick film portion 9 at the beginning of the coating, which is generated at the start of coating, is prevented from being cracked or unburned by the subsequent drying / baking in the oven. No line troubles were caused by the poor paint appearance of the body 7 or the contamination of the line roll after the oven.

Further, if a cleaning liquid is applied to the surface before the leveling roll 11 is brought into contact with the tip thick film portion 9, smoothing can be performed more smoothly. The same applies when the coating is interrupted or finished.

FIG. 2 is a diagram immediately after the start of coating of the roller curtain coater apparatus by the blade leveling method according to the present invention. The roll leveling method and the structure of the leveling device are the same as those of the roll leveling method except for the difference between the roll and the blade. In this case, the blade 21 may be cleaned by any method, for example, ultrasonic cleaning or the like (not shown) is allowed.

[0020]

EFFECTS OF THE INVENTION According to the present invention, the thick film portion of the coating material that occurs at the start of coating, or at the time of coating interruption or at the end of coating, may cause armpits or become unburned by subsequent drying / baking in an oven. Is prevented and the inside of the oven is soiled,
No line trouble was caused by the poor appearance of the paint on the coated object or the contamination of the line roll after the oven.

[Brief description of drawings]

FIG. 1 is a diagram immediately after starting coating of a roller curtain coater apparatus by a roll leveling method according to the present invention.

FIG. 2 is a diagram immediately after the start of coating of the roller curtain coater apparatus by the blade leveling method according to the present invention.

FIG. 3 is a diagram immediately after starting coating with a conventional roller curtain coater device.

[Explanation of symbols]

 1a Coating roll 1b Doctor roll 2 Blade 3 Paint receiving pan 4 Paint receiving pan forward / backward movement mechanism 5 Paint receiving pan Paint discharge port 6 Painted object 7 Paint curtain 8 Paint reservoir 9 Coating start tip thick film part 11 Leveling roll 12 Leveling Roll elevating mechanism 13 Leveling roll forward / backward moving mechanism 14 Cleaning roll 15 Cleaning pan 16 Cleaning liquid supply port 17 Cleaning liquid discharge port 18 Cleaning liquid 21 Leveling blade 22 Leveling blade lifting mechanism 23 Leveling blade forward / backward mechanism 31 Shielding plate 41 Shutter 42 Shutter Forward / backward mechanism

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitsuru Mochida 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Kimitsu Steel Co., Ltd.

Claims (4)

[Claims] 1. A roller curtain coater device for forming a coating film by passing a paint curtain flowing down an object to be coated, comprising a curtain receiver having a forward / backward moving mechanism and a discharge port for the paint between a blade and the object to be coated. A roller curtain coater device characterized in that a paint film leveling device having a shutter having an elevating function and a forward / backward moving mechanism at a lower part is provided on the side of the advancing direction of the object to be coated. 2. The roller curtain coater device according to claim 1, further comprising a leveling device having a roll structure. 3. The roller curtain coater device according to claim 1, further comprising a leveling device having a blade structure. 4. The roller curtain coater apparatus according to claim 1, further comprising a cleaning pan for applying the paint cleaning liquid to the leveling device before use.