JP3021838B2 - Coating head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus such as a die coater head or a fountain head in a coating apparatus used for coating a wide surface of a substrate to be coated. TECHNICAL FIELD The present invention relates to a coating head improved so that a coating position and a coating width used for coating a photosensitive layer on a wide aluminum plate in a flexible printing plate can be changed and adjusted.

[0002]

2. Description of the Related Art In general, as a method of applying a coating liquid onto a wide surface of a substrate to be coated such as a strip, a sheet, and a film made of metal, plastic, and paper, as shown in the conceptual diagrams of FIGS. A belt-like substrate (3) having a constant surface distance from the coating head (1) with the back roll (2) is applied on the back roll (FIG. 1) or in the middle of the two back rolls. In FIG. 2, a method of directly applying from the coating head (1) or, though not shown, pressing the coating roll onto a back roll supporting a wide substrate to be coated, A method is widely used in which the flowing coating solution is applied onto the coating roll and then applied from the coating roll onto the substrate to be coated.

[0003] In such a coating apparatus, when it is necessary to change the coating width or coating pattern of a substrate to be coated, a coating head such as a die coater head or a fountain head which is usually used is not used. Measures are taken such as replacing the entirety, or inserting a film-shaped or sheet-shaped shielding material into a slit which is an outlet of the coating liquid.

[0004]

By the way, in the work of the method of changing the coating width by sandwiching the film sheet in the slit of the coating head, the slit gap of the coating head is loosened each time the coating width is changed. It is necessary to change and adjust the position and readjust the slit gap, and the coating operation must be interrupted. In order to reduce the time of interruption of the coating operation, a method of preparing a plurality of coating heads and adjusting one while using the other is also adopted. However, in order to uniformly apply the coating fluid from the coating head to the sheet surface, the distance between the head tip and the sheet surface needs to be accurately positioned. Work also requires a considerable amount of time. In addition,
As the viscosity of the application fluid changes depending on the temperature and concentration, the application width also changes, so that fine adjustment of the application width is inevitable every time.

[0005] In addition, maintenance and cost are required to prepare a plurality of coating heads. Further, in the conventional sealing method using a film sheet, it has been difficult to continuously change the application width for each position in the axial direction.

[0006]

Means for Solving the Problems The present inventors have intensively studied to obtain an excellent coating head overcoming such difficulties, and as a result, have reached the present invention. An object of the present invention is to provide a coating head capable of changing and adjusting a coating position and a coating width without interrupting the coating. It is another object of the present invention to provide a coating head and a coating method which can easily and accurately change the coating position and the coating width without changing the coating head.

Another object of the present invention is to provide a method for finely adjusting a coating position and a coating width in accordance with a change in viscosity of a coating fluid due to temperature and concentration, without interrupting a coating operation, easily and at a high level. An object of the present invention is to provide a coating head that can be performed with high accuracy. Further, another object of the present invention is to provide a coating head which eliminates the need to prepare several types of coating heads according to the coating width and enables highly productive and economical coating. is there.

Another object of the present invention is to provide a coating head which enables a plurality of simultaneous coatings. Another object of the present invention is to provide a coating head capable of adjusting a rotation of a rod to form a pattern in which a coating width and / or a coating position is continuously changed.

Accordingly, an object of the present invention is to provide a coating head for applying a coating solution to a wide substrate to be coated, wherein the coating head has at least a circle having a central axis in the coating width direction. A column-shaped hollow liquid reservoir, a supply port for supplying the coating liquid to the liquid reservoir, and at least a maximum coating width for supplying the coating liquid from the liquid reservoir to a coating liquid outlet at the tip of the coating head. A slit having a longitudinal direction equal to and
The reservoir has a short periphery that is not in close contact with a long periphery that is in close contact with the inner peripheral surface of the reservoir, and is rotatably fitted with the central axis of the reservoir as a rotation axis. A long-peripheral portion capable of shielding the opening of the slit in the reservoir in at least a part of the axial direction within the same cross-sectional circle; When the portion is at a position that does not cover the opening portion, the short portion that can form a coating solution flow path from the coating solution supply port to the opening portion, and changes the rotational position of the rod. Thus, the position and / or width of the coating liquid flowing into the slit from the liquid reservoir can be changed, thereby easily achieving the coating head with the variable coating position and coating width.

Hereinafter, the present invention will be described in detail. 3 and 4 conceptually show an example of the coating head of the present invention. FIG. 3 is a conceptual view of the appearance, and FIG. 4 is a sectional explanatory view of the coating head. The coating head includes an upper body (5), a lower body (6), a dial (7), a tightening bolt (8),
It comprises a coating liquid outlet (9), a coating liquid supply port (10), a slit (11), a reservoir (13), and a rod (14). The upper body (5) and the lower body (6) are connected by fastening bolts (8). When the dial on the side of the coating head is rotated, the rod (14)
The application position and the application width are set.

The rod according to the present invention has a short peripheral portion that is not in close contact with a long peripheral portion that is in close contact with the inner peripheral surface of the liquid reservoir portion, and is rotatably fitted around a central axis of the liquid reservoir portion as a rotation axis. I have. Further, in the rod of the present invention, at least a part in the axial direction as shown in FIG.
When the long peripheral portion is located at a position that does not cover the opening of the slit and has a circumferential angle amount, the short peripheral portion forms a coating liquid flow path from the supply port of the coating liquid to the opening. Have been. The term "close" as used herein means that the coating liquid does not flow between the inner peripheral surface of the liquid reservoir and the outer peripheral surface of the long peripheral portion of the rod. In addition, the term “shielding” herein means that the long periphery of the rod covers the entire opening of the slit at a certain position in the axial direction so that the coating liquid does not flow into the slit. At this time, if the long circumferential portion that can be shielded is partially installed along the axial direction of the rod only at a certain angular amount or at a certain angular position, it can be switched to two application widths or patterns, The long circumference,
Two or more different positions in the axial direction of the rod may have different existing angle amounts and / or angular positions, so that three or more different application widths or patterns can be changed. The angle of existence of the long circumference and / or
Alternatively, the change in the angular position can be set stepwise and / or continuously, and as shown in FIGS. 5, 8, and 9, when continuously changed, the rotation of the rod causes the application width or the application pattern to change. Can be continuously and continuously changed.

Then, the application fluid is pressed by, for example, a pump and flows into the reservoir (13) from the supply port (10).
After the pressure is equalized, it passes through the slit (11), and the flow distribution in the longitudinal direction of the slit becomes uniform, and reaches the outlet (9).
As shown in FIG. 1 or FIG. 2, it is applied to the surface of a wide substrate to be coated. In the present invention, as the wide substrate to be coated,
If the surface to be coated is wide, it may be of various shapes such as sheet, plate, coil, etc., regardless of its material and shape. FIG. 6 is a cross-sectional explanatory view showing a cross section of the coating head in a case where the long peripheral portion and the short peripheral portion are in contact with the opening of the slit, respectively.

FIG. 8 shows, as an embodiment A, the structure of a rotating rod (14) for simultaneous adjustment of the coating width at both ends and the coating head. In the part where the central part of the rod is substantially constituted only by the short peripheral part, and the short peripheral part is in contact with the slit opening part,
The application fluid is applied through the slit. 1 rod
Because of the book, the rotation of the rod causes the long peripheral portions provided at both ends in the longitudinal direction of the slit with a larger angle to operate simultaneously at both ends to shield the slit opening. In the present invention described above, the rod (14) fitted to the reservoir (13) has been described as being integrally formed as a whole.
The present invention is not limited to this, and it may be of two bodies divided into right and left in the middle. In that case, dials (7) are provided at both ends of the coating head, and by rotating each independently, Further, it is possible to switch to various application patterns. One example is shown in FIG. FIG.
The structure of the rotating rod (14) for independent adjustment of the coating width at both ends and the coating head is shown. In the drawing, the rod (14) is shown only on the left side, but a similar independent rod is also mounted on the right side. Thus, in a system in which two rods (14) are provided, one at each end in the longitudinal direction of the slit, the shield width and the position of the slit opening can be independently adjusted by rotating the rod.

[0014]

As described above, according to the present invention, the coating width can be set and finely adjusted by appropriately setting the long circumference and the short circumference so that the coating operation is not interrupted. Also, coating of various widths or patterns can be performed extremely easily and with high precision without disassembling the coating head. Further, by providing a plurality of rod closing portions and rod opening portions in the same slit longitudinal direction, simultaneous coating at a plurality of positions and widths can be performed.

Further, according to the present invention, the coating width can be adjusted without interrupting the coating even during the coating, and the coating width can be controlled by the change in the physical properties of the coating fluid during the coating. Can also be adjusted. In addition, it is not necessary to prepare several types of coating heads according to the coating width, so that economical coating with high productivity can be performed.

[Brief description of the drawings]

FIG. 1 is a conceptual side view of an example of a coating method to which a coating head is applied.

FIG. 2 is a schematic side view of an example of a coating method to which a coating head is applied.

FIG. 3 is an example of an outline drawing of a coating head.

FIG. 4 is an explanatory cross-sectional view of a coating head taken along a plane perpendicular to a slit longitudinal direction.

FIG. 5 is a conceptual diagram showing a correlation between an example of a rod inside a coating head and a slit.

FIG. 6 is an explanatory cross-sectional view of the coating head at a position where a long peripheral portion abuts a slit opening.

FIG. 7 is an explanatory cross-sectional view of the coating head at a position where a short peripheral portion is in contact with a slit opening.

FIG. 8 is an exploded view of the embodiment A.

FIG. 9 is an exploded view of an embodiment B.

[Explanation of symbols]

(1) Coating head (2) Back roll (3)
Substrate to be coated (4) Coating fluid (5) Upper body (6)
Lower body (7) Dial (8) Tightening bolt (9)
Outflow section (10) Supply port (11) Slit gap (1
2) Pump (13) Reservoir (14) Rod (1)
5) Rod long circumference (16) Rod short circumference (17) Slit (18) Slit surface (19) Top and bottom body mating surface (20) Rod slide stop (21) Body side rod slide stop (a) Rod Closed part (b) Rod open part

Claims (3)

(57) [Claims] 1. A coating head for applying a coating liquid to a wide substrate to be coated, wherein the coating head has at least a cylindrical hollow liquid reservoir having a central axis in a coating width direction. A supply port for supplying the coating liquid to the reservoir, a slit having a longitudinal direction at least equal to the maximum coating width, for supplying the coating liquid from the reservoir to the coating liquid outlet at the tip of the coating head, And, the liquid reservoir has a short peripheral portion that is not in close contact with a long peripheral portion that is in close contact with the inner peripheral surface of the liquid reservoir portion, and is rotatably fitted around a central axis of the liquid reservoir portion as a rotation axis. In this case, at least part of the rod in the axial direction, within the same cross-sectional circle, the long peripheral portion capable of shielding the opening of the slit in the reservoir, and the shieldable When the long perimeter is in a position that does not cover the opening, the coating liquid A short-peripheral portion capable of forming a coating liquid flow path from the supply port to the opening, and a position where the coating liquid flows into the slit from the liquid reservoir by changing the rotational position of the rod; and / or A coating head having a variable coating position and a variable coating width, wherein the coating width can be changed. 2. The patent, wherein the shieldable long circumference has different existence angle amounts and / or angle positions from each other in at least two or more different positions in the axial position of the rod. The coating head according to claim 1. 3. The coating head according to claim 2, wherein an angle amount and / or an angular position of the shieldable long peripheral portion is continuously changed.