JPH10244194A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate the occurrence of deflection at a small-diameter rod for coating. SOLUTION: This device is constituted to coat a traveling web W with the coating liquid adhered in an adhesion region on the outer peripheral surface of the rod 10 for coating which extends in a lateral direction and is rotationally driven. In such a case, the device has clampers 9 for clamping the outer peripheral surface of the rod 10 to prevent the vertical and longitudinal movement of the rod 10 in the adhesion area and holders 8 for holding the clampers 9. The device is provided with a coating liquid reserving space 17 forming the adhesion area between the clampers 9 and the rod 10 and is provided with a coating liquid supplying path 24 communicating with this coating liquid reserving space 17. The uniform coating on the web W is made possible by prohibiting the deflection and vertical and longitudinal movements of the small-diameter rod 10 and further, the dealing with the coating conditions requiring the high- speed rotation of the rod 10 is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a coating liquid to a sheet-like web such as a running paper, plastic film, metal foil or the like using a coating rod having a small diameter of about 10 to 30 mm. The present invention relates to a coating device.

[0002]

2. Description of the Related Art In order to reliably apply a coating liquid by bringing a coating rod into contact with a web, it is necessary to increase the pressure of the web against the outer peripheral surface of the coating rod.
One method of responding to this request is to increase the web tension, but there is a limit because the web tension has an upper limit. Another method is to reduce the diameter of the coating rod.

[0003] As a coating apparatus in which the diameter of the coating rod is reduced, there is one described in Japanese Utility Model Laid-Open Publication No. 64-44078. This coating apparatus has a small diameter coating rod (diameter of 20 mm).
(A gravure roll of about 50 mm) is rotatably supported by bearings, and a coating liquid is previously attached to the surface of a coating rod from a coating liquid supply nozzle provided between the bearings. It is.

[0004]

However, since the coating rod of the coating apparatus is not supported between the two bearings, bending occurs between the two bearings due to the pressure of the web and the weight of the rod. . This bending may make the contact state between the outer peripheral surface of the coating rod and the web non-uniform in the web width direction, resulting in non-uniform coating. Furthermore, when the coating rod is rotated at a high speed, the deflection of the rod increases the deflection of the rod, so that coating may not be performed. for that reason,
The above-mentioned coating apparatus has a limit in increasing the coating speed.

In order to solve the above-mentioned problems, the present invention provides a coating apparatus which does not cause bending of a small-diameter coating rod.

[0006]

In order to prevent the coating rod having a small diameter from being bent, the means adopted by the present invention according to the first aspect of the present invention is provided on a running web so as to extend in the left-right direction and rotate. A coating device for applying a coating liquid adhered to an outer peripheral surface of a coating rod in an adhesion region to be applied, wherein a clamping device for clamping an outer peripheral surface of the rod so that the rod does not move up and down and back and forth in the adhesion region. , A holding tool for holding the holding tool, a coating liquid storage space for forming the adhesion area is provided between the holding tool and the rod, and a coating liquid supply path communicating with the coating liquid storage space is provided. It is. In the present invention, since the outer peripheral surface of the coating rod that is driven to rotate is held by the holding device, the bending of the coating rod and the vertical and backward movement of the coating rod can be prevented, and the coating rod is provided between the holding device and the rod. When the coating liquid supply space is filled with the coating liquid supplied from the coating liquid supply passage, the coating liquid is caused to adhere to the outer peripheral surface of the rod.

In order to prevent the bending of the coating rod having a small diameter, the means adopted by the present invention according to the second aspect is the coating apparatus according to the first aspect, wherein the holding tool and the holding tool are provided. And a pressing tool for adjusting the pressing force of the holding tool for pressing the outer peripheral surface of the rod. In the present invention, since the pressing force of the holding tool against the outer peripheral surface of the rod can be adjusted, the rod can be reliably held with the optimum pressing force.

In order to make the coating liquid adhere to the outer peripheral surface of the coating rod having a small diameter evenly, the means adopted by the present invention according to the third aspect is the coating apparatus according to the first or second aspect, The coating liquid reservoir space is shaped so that the width in the left-right direction increases as it goes from the coating liquid inlet opening into the space toward the outer peripheral surface of the rod. According to the present invention, the coating liquid supplied from the connection port to the coating liquid storage space diffuses in the left and right directions in the coating liquid storage space as it goes toward the outer peripheral surface of the rod. The liquid can be uniformly attached.

In order to form a small-diameter coating rod by a gravure method or the like, the means adopted by the present invention according to claim 4 is as follows.
The coating device according to claim 1, 2, or 3, wherein a part of the holding tool is formed by a doctor that contacts an outer peripheral surface of the rod. The present invention makes it possible to simplify the device structure by providing the function of the holding tool to the doctor, and to use a gravure type in which a micro concave portion is engraved on the outer peripheral surface of the rod or a wire type in which a wire is wound around the outer peripheral surface of the rod. Even when the rod is selected, the excess coating liquid deposited on the outer peripheral surface of the rod can be scraped off by a doctor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a coating apparatus according to the present invention will be described based on an embodiment shown in the drawings.

(First Embodiment) FIGS. 1 to 3 show a first embodiment.
1 is a right side view in cross section, FIG. 2 is a front view in which an intermediate portion is shown in a cross section taken along line AA and BB in FIG. 1, and FIG. 3 is an exploded view. It is the right side view which carried out the section of the state where it did.

The coating equipment 1 is provided with a coating device 2 and a web transport device 3 as shown in FIG. The web transport device 3 includes guide rolls 4 rotatably disposed at predetermined positions.
4 and a dancer roll 5 swinging in the direction of arrow E.
I will guide you at. When the dancer roll 5 is stopped at the upper stop position C, the web W is set to the non-coating state, and when the dancer roll 5 is stopped at the lower stop position D, the web transfer device 3 applies the web W to the coating device 2. The coated rod is brought into contact with the processing rod 10.

The coating apparatus 2 includes a fixed frame 6, a holder 8 attached to the fixed frame 6 with bolts 7, a holding device 9 held by the holding device 8, and a coating device held by the holding device 9. And a working rod 10. Rod 10 is shown in FIG.
As shown in the figure, left and right bearing brackets 1 provided on holding pieces 18 of a holding tool 8 to be described later by bolting 11, 11 and the like.
Bearings 1 made of bearings, metal, etc.
It is pivotally supported via 3,13. The rod 10 is connected to an output shaft of a drive motor (not shown) via a shaft coupling 27 so as to rotate at an appropriate rotational speed in the traveling direction of the web W or in the opposite direction. Bracket 12 for each bearing
Has a split structure (see FIG. 3) so that the coating rod 10 can be attached and detached. Rod for coating 1
0 is a rod having a diameter of about 10 to 30 mm, a round bar having a smooth surface, a gravure type in which a fine recess is engraved on the outer surface of the round bar, or a wire wound around the outer surface of the round bar. Wire type is selected. In addition, rod 10
May periodically reciprocate (oscillate) in the left-right direction.

As shown in FIGS. 1 and 2, the holding member 9 includes a front holding member 14, a rear holding member 15, and left and right end pieces 16, 16. A coating liquid storage space 17 surrounded by 15 and end pieces 16, 16 is formed. The front and rear sandwiching pieces 14, 15 and the end piece 16 are made of a synthetic resin such as polyethylene, hard rubber, metal such as brass, or a material such as ceramic. By holding the front and rear holding pieces 14 and 15 together, the holding tool 9 holds the outer peripheral surface of the rod 10 from the front and rear by the curved surface portions 14a and 15a so that the rod 10 does not move up and down and back and forth. Each end piece 16 is arranged between the end of the combined holding pieces 14 and 15 and the bearing bracket 12, and is held by the holder 8.

When a round bar having a smooth surface is used as the coating rod 10, the holding member 9 has a curved surface portion 14a, 1a.
A gap of an appropriate size is formed between 5a and the outer peripheral surface of the rod 10, so that the coating liquid having an appropriate layer thickness adheres to the outer peripheral surface of the coating rod 10 coming out of the holding tool 9. When a gravure type or a wire type is used as the coating rod 10, the holding tool 9 has a curved surface portion 14a,
It is not necessary to form a gap between the rod 15a and the outer peripheral surface of the rod 10.

The coating liquid reservoir space 17 has an upper end opened so as to face the outer peripheral surface of the rod 10 and forms an adhesion area for adhering the coating liquid to the outer peripheral surface of the rod 10. The coating liquid reservoir space 17 has a coating liquid inlet 17a at the center in the left-right direction.
And is formed in a so-called coat hanger shape in which the width in the left-right direction increases as it goes from the coating liquid inlet 17a toward the outer peripheral surface of the rod 10. Coating liquid storage space 17
Is formed in the shape of a coat hanger so that the coating liquid supplied into the space from the coating liquid inlet 17a is uniformly distributed in the left-right direction and reaches the outer peripheral surface of the rod 10, so that the outer periphery of the rod 10 The coating liquid is made to adhere uniformly to the surface. The coating liquid storage space 17 has a hermetically sealed structure surrounded by the holding tool 9 and the outer peripheral surface of the rod 10, and can block contact between the coating liquid in the coating liquid storage space 17 and the outside air. The coating liquid storage space 17 forms a large space manifold (not shown) in the middle of the space in the left-right direction in accordance with the type of the coating liquid. The diffusion of the liquid in the left-right direction may be made more uniform.

A holding tool 8 for holding the holding tool 9
Comprises a front holding piece 18 and a rear holding piece 19,
By joining the two members 18, 19 with bolts 20, 20,..., The holding member 9 is held so as not to be detached. The rear holding piece 19 is provided with a pressing tool 21 so as to adjust the pressing force of the holding tool 9 for pressing the outer peripheral surface of the rod 10. The pressing tool 21 is formed by internally fitting a rubber tube 22 made of syringe rubber or the like into a concave groove 19 a formed in the left and right direction of the holding piece 19, and from the pressure air supply pipe 23 (see FIG. 2) to the rubber tube 22. The rubber tube 22 is expanded with the supplied compressed air to press the back side of the holding piece 15 of the holding tool 9. The adjustment of the pressing force is performed by adjusting the pressure of the supplied air. The pressing tool 21 is not shown in the drawing other than the structure using the rubber tube 22, but it is also possible to adopt a structure in which the back side of the holding piece 15 is pushed and pulled by the tips of bolts screwed to the holding piece 19 at appropriate intervals. It is.

The front holding piece 18 is provided with a coating liquid supply passage 24 communicating with the coating liquid storage space 17. A coating liquid supply pipe 25 is joined to the coating liquid supply path 24 so that a pump-up coating liquid is supplied. The coating apparatus 2 is provided with liquid receivers 26, 26, and collects uncoated coating liquid and coating liquid leaked from a gap between the holding tool 9 and the rod 10, and the like.

Next, the operation of the coating equipment 1 will be described. First, as shown in FIG.
The web W is run with the dancer roll 5 stopped at the upper stop position C, and the coating lot 10 is rotated while the coating liquid reservoir space 17 is filled with the coating liquid. deep. At this time, the operator presses the pressing tool 2
1 by adjusting the pressing force, the gap between the rod 10 and the holding tool 9 is adjusted, and a suitable layer is formed on the outer peripheral surface of the coating rod 10 which has passed through the coating liquid storage space 17 and emerged from the holding tool 9. The coating liquid having a thickness is allowed to adhere. When coating is started, the dancer roll 5 of the web transport device 3 is moved to the lower stop position D, and the running web W is brought into contact with the rotating coating rod 10 of the coating device 2 to perform coating. Do.

Since the coating rod 10 being rotated has its outer peripheral surface clamped by the clamp 9, the rod 10 is prevented from bending and moving up and down and back and forth, and a stable coating state can be maintained. . When the coating is stopped, the dancer roll 5 of the web transfer device 3 is moved to the upper stop position C, and the lot 10 and the web W are brought out of contact. When the coating operation is completed and the coating apparatus 2 is to be cleaned, as shown in FIG. 3, the holding tool 8, the holding tool 9, the bearing 12 and the coating lot 10 are disassembled.

(Second Embodiment) FIG. 4 is an enlarged view of the second embodiment, and is a right side view in cross section. This embodiment differs from the first embodiment in that a part of the holding tool 9 is formed by a doctor 33 which comes into contact with the outer peripheral surface of the rod 10. That is, the coating device 32 is provided with the curved surface portion 1 of the holding piece 15 on the rear side of the holding tool 9.
5a is made small, and the rod 10 is clamped from the front and rear by the front holding piece 14 and the doctor 33 so that the rod 10 does not move back and forth and up and down and back and forth. The configuration other than the difference is substantially the same as that of the first embodiment, and the same reference numerals denote the same components.

Since the coating rod 10 is provided with the doctor 33, the coating rod 10 has a gravure type in which a fine recess is engraved on the outer peripheral surface of a round bar having a diameter of about 10 to 30 mm, or the outer peripheral surface of the round bar. A wire type wound wire is selected. The coating device 32 removes excess coating liquid adhering to the outer peripheral surface of the rotating rod 10 by a doctor blade 33.
a, and in the case of the gravure type, the coating liquid stored in the concave portion is applied to the web W. In the case of the wire type, the coating liquid stored in the concave portion between adjacent wires is coated on the web W. Apply to It should be noted that the doctor 33 may be periodically reciprocated (oscillated) in the left-right direction to maintain smooth scraping.

[0023]

As described in detail above, the coating apparatus according to the present invention has the following excellent effects.

According to the first aspect of the present invention, the bending of the coating rod having a small diameter and the vertical and horizontal movement of the coating rod are prevented.
Uniform coating on the web is enabled, and it is possible to cope with coating conditions that require high-speed rotation of the coating rod. According to the second aspect of the present invention, more uniform coating can be ensured by ensuring that the small diameter coating rod is prevented from bending.

According to the third aspect of the present invention, by uniformly applying the coating liquid to the outer peripheral surface of the rod, it is possible to eliminate coating unevenness and secure uniform coating. According to the fourth aspect of the present invention, the structure of the apparatus can be simplified, and the selection range of the types of small-diameter coating rods can be expanded.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a coating apparatus according to the present invention, and is a cross-sectional right side view.

FIG. 2 is an intermediate front view showing a portion taken along line AA and line BB in FIG. 1;

FIG. 3 is a right side view showing a cross section in a disassembled state in the embodiment.

FIG. 4 is an enlarged view of a second embodiment of the coating apparatus according to the present invention, and is a cross-sectional right side view.

[Explanation of symbols]

8 ... holding tool, 9 ... holding tool, 10 ... coating rod, 17 ...
Coating liquid storage space, 21 ... Pressing tool, 24 ... Coating liquid supply path, 3
2 ... Doctor, W ... Web

Claims (4)

[Claims] 1. A coating apparatus for coating a running web with a coating liquid extending in the left-right direction and adhering to an outer peripheral surface of a coating rod that is rotationally driven in an adhesion area. A holding device for holding the outer peripheral surface of the rod so that the rod does not move up and down and back and forth, and a holding device for holding the holding device, the coating liquid reservoir space forming the adhesion area is provided between the holding device and the rod. And a coating liquid supply passage communicating with the coating liquid storage space. 2. The coating apparatus according to claim 1, further comprising a pressing tool provided between said holding tool and said holding tool for adjusting a pressing force of said holding tool for pressing an outer peripheral surface of said rod. 3. The coating liquid reservoir space is formed such that the width in the left-right direction becomes larger as it goes from the coating liquid inlet opening into the space toward the outer peripheral surface of the rod.
Or the coating device of 2. 4. The coating apparatus according to claim 1, wherein a part of said holding tool is formed by a doctor which comes into contact with an outer peripheral surface of said rod.