JP2002273190A - Coating liquid stirring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating liquid free from air bubbles, prepared while removing a solid component or solid foreign matter. SOLUTION: A rotary drive shaft 14 is inserted in a freely rotatable manner in the center part of the lid 3 of a vacuum tank I, which consists of a tank body part 1 having a coating liquid outlet 2 provided to the lower end thereof and the lid 3 provided with a coating liquid inlet 4 and a vacuum suction port 5 to which a vacuum pump 8 is connected. A drive motor 17 is connected to the upper end of the rotary drive shaft 14, and the center part of a rotary disc 18 is attached to the lower end of the rotary drive shaft 14. A reticulated plate 19 is provided to the peripheral part of the upper surface of the rotary disc 18, and a fixed disc 20 having an impingement plate 21 provided to the peripheral part of the undersurface thereof is positioned above the rotary disc 18 to be attached to the lid by a support member 13. A coating liquid supply pipe 22 for guiding the coating liquid 27 to the upper surface of the center part of the rotary disc 18 from the coating liquid inlet 3 is provided. When the coating liquid 27 is supplied to the rotary disc 18 during rotation after evacuating the vacuum tank I, the coating liquid 27 is scattered in the outer peripheral direction by centrifugal force to be finely divided to be mutually dissolved and collides with the impingement plate 21 and the inner wall surface of the tank body part 1 without mixing of air under vacuum to break bubbles and a solid component and solid foreign matter are separated by the meshes of the reticulated plate 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating liquid stirring device used for stirring a coating liquid supplied to a coating device.

[0002]

2. Description of the Related Art Paper manufactured in a paper mill is not immediately used as it is, but may be used as a base paper for further processing to obtain a processed paper as a product meeting a required purpose. Many. There are various types of processed paper, and one of them is coated paper (coated paper). Such coated paper is manufactured by applying a coating liquid (color for coating) to the surface of paper for the purpose of improving the properties of the surface of the paper, and there is a coating apparatus as the apparatus.

As one of the coating apparatuses, for example, a curtain coater has a base paper a as shown in FIG.
Is wound around the coater roll b, and then travels along the guide roll c. The coating liquid e is applied to a position above the base paper a located between the coater roll b and the guide roll c. A curtain coater head (liquid supply head) d is placed in the form of a curtain film, and a coating liquid e flowing down from the curtain coater head d is caused to flow down onto the surface of the base paper a. e is applied directly on the base paper a.

In the case of the above-mentioned curtain coater, since a coating liquid is allowed to flow down and directly applied to produce a product, if the coating liquid e contains air bubbles or foreign matter, it may be a defective product. The coating liquid used in the coating apparatus is a mixture of many raw materials. For this reason, it is necessary to stir the coating liquid to sufficiently dissolve the raw materials or to remove bubbles before supplying the coating liquid to the coating apparatus. A stirrer was installed in which a stirring blade was rotated in a tank capable of temporarily storing the working liquid, and the coating liquid was stirred by the stirrer.

[0005]

However, in the case where the coating liquid e is stirred by rotating the stirring blade in the tank, the coating liquid e is already solid at the time of being supplied to the stirring device. Components and solid foreign matter may not be sufficiently stirred, and the coating solution may be fed from the stirring device to the coating device in order to remove these solids and foreign materials. A filter must be provided in the middle of the liquid supply line, and in the above-described conventional stirring device, the coating liquid is stirred while being in contact with air. There is a risk that air may be mixed in, and applying a coating liquid containing air bubbles may cause defects as pinholes on the coating surface.Therefore, air bubbles mixed into the coating liquid in the middle of the coating liquid supply line Do not provide a bubble removal device to remove air. There is a problem that must Re.

Accordingly, the present invention is capable of continuously dissolving the coating liquid sufficiently while removing solids and solid foreign matters, preventing air from being mixed in, and removing air bubbles. An object of the present invention is to provide a coating liquid stirring device that does not require a removal device.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention opens and closes a lid having a coating liquid inlet and a vacuum suction port at the upper end of a tank body having a coating liquid outlet at a lower end. Provided as possible, at the center position of the lid of the vacuum tank, the inside of which can be evacuated by a vacuum pump connected to the vacuum suction port, a rotary drive shaft is vertically rotatably supported and rotatably supported, And inside the tank body,
A rotating disk having a mesh-shaped plate in the circumferential direction is arranged in a horizontal state on the upper surface of the peripheral portion, and the lower end of the rotating drive shaft is fixed to the center of the rotating disk, and further, the rotating drive shaft Is connected to the drive unit on the lid, and the other end of the coating liquid supply pipe, one end of which is connected to the coating liquid inlet, faces the upper surface near the center of the rotating disk. The coating liquid supplied to the container is moved to the peripheral portion by centrifugal force.

A vacuum pump is operated to evacuate the inside of the vacuum tank to a vacuum, and in a state where the mesh plate is rotated together with the rotating disk by the driving device, the rotating disk is passed through the coating liquid supply pipe from the coating liquid inlet. When the coating liquid is supplied to the upper surface near the center, the coating liquid scatters in the outer peripheral direction due to the centrifugal force caused by the rotation of the rotating disk, is miniaturized, and fused. At this time, when the coating liquid which has been miniaturized and has an increased surface area is exposed to a vacuum, mixed air bubbles are ruptured and removed. Further, the coating liquid scattered in the outer peripheral direction and reaches the inner peripheral surface of the mesh plate is moved to the outer periphery side through the mesh of the mesh plate, thereby being separated from solid components and solid foreign matter. You. Further, the coating liquid that has passed through the mesh of the net-like plate is caused to collide with the inner wall surface of the tank body by centrifugal force and is broken. The coating liquid that has hit the inner wall surface of the tank body is caused to flow down along the inner wall surface of the tank body by its own weight. Thereby, the coating liquid from which solid components and solid foreign matters are removed and bubbles are removed accumulates in the lower part of the tank body. Therefore, the coating liquid containing no solid component or solid foreign matter and containing no air bubbles is sent from the coating liquid outlet.

A horizontal fixed disk having a collision plate in the circumferential direction on the lower surface of the peripheral portion is provided above the rotary disk inside the tank body, and the collision plate of the fixed disk is the rotary disk. Centrifugal force associated with the rotation of the rotating disk by arranging it so that it faces the net-like plate provided on the upper surface of the The coating liquid scattered in the outer peripheral direction by the force can collide with the collision plate, and the bubbles mixed therein can be destroyed by the impact force at the time of collision with the collision plate, and the bubble removal effect can be improved. Can be enhanced.

[0010] Furthermore, by forming a net-like plate provided on the upper surface of the rotating disk and a collision plate provided on the lower surface of the fixed disk in a plurality of stages in the radial direction, the solid component and the solid state can be obtained. The foreign matter removing effect and the bubble removing effect can be further improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a coating liquid stirring device according to the present invention. A coating liquid inlet 4 is provided at an upper end of a cylindrical tank body 1 having a coating liquid outlet 2 at a lower end. And a lid 3 having a vacuum suction port 5 are placed so as to be openable and closable, and the inside can be evacuated by a vacuum pump 8 connected to the vacuum suction port 5 via a suction line 6 and a foreign matter / moisture removing device 7. A vacuum tank I is constructed, and a bracket 9 protruding from the lower outside of the lid 3 of the vacuum tank I is connected to an upper end of a support base 10 for fixing and supporting the tank body 1 by a hinge 11, and is mounted on a foundation. Actuator 1, such as an installed hydraulic cylinder
2 allows the lid 3 to be opened and closed around the hinge 11. The lid 3 of the vacuum tank 1
Is fixed to the upper end of a cylindrical support member 13 which penetrates vertically in the vertical direction and protrudes inward by a required size.
The rotary drive shaft 14 is inserted through the shaft center position inside the support member 3 and is rotatably supported inside the support member 13 by the bearing 15. The upper end of the rotary drive shaft 14 is supported on the upper surface of the lid 3 by the support member 16. An output shaft 17a of a driving motor 17 as a driving device mounted downward via a joint is connected via a joint so that the rotation of the driving motor 17 allows the rotary drive shaft 14 to rotate. At the lower end of the rotary drive shaft 14, a central portion of a horizontal rotating disk 18 is attached, and a large number of small holes are formed in a net shape at required radial positions on the upper surface of the outer peripheral portion of the rotating disk 18. A plate 19 having a wall shape is arranged upright in the circumferential direction, and the lower ends of the mesh plates 19 are integrally attached to the upper surface of the rotating disk 18, respectively.
8 and each mesh plate 19 can be integrally rotated. Further, a fixed disk 20 is disposed in a horizontal state above each of the rotating disks 18, and a lower end of the cylindrical support member 13 is inserted into a central portion of the fixed disk 20, and the support member 13 and the fixed disk 20, and on the lower surface of the outer peripheral portion of the fixed disk 20, the inner circumferential side of the innermost mesh plate 19, and the mesh adjacent to the mesh plate 19 and the outer circumferential side A collision plate 21 having a width dimension extending from above to a position near the rotating disk 18 is disposed in the circumferential direction between the plate 19 and the upper end thereof, and one end is provided at the coating liquid inlet 4 inside the tank. The other end of the connected coating liquid supply pipe 22 is provided so as to face the upper surface near the center of the rotating disk 18 through the fixed disk 20.

A vacuum tank I connected to the coating liquid inlet 4
A coating liquid supply unit (not shown) is connected to a coating liquid supply pipe 22 disposed therein via a coating liquid supply line 24 having a coating liquid supply pump 23. The liquid outlet 2 is connected to a liquid supply head of a coating device (not shown), for example, a curtain coater head d of a curtain coater as shown in FIG.
The connection is made via.

A seal device (not shown) is provided in a portion of the cylindrical support member 13 through which the rotary drive shaft 14 passes, so that outside air does not enter the vacuum tank I through the inside of the support member 13. Sealed to.

When the coating liquid 27 to be supplied to the coating apparatus is stirred, the vacuum pump 8 is operated in advance to suction the inside of the vacuum tank I to a vacuum, and the driving motor 1
7, the rotating disk 18 and the mesh plate 19 are rotated integrally.

In this state, the coating liquid supply pump 2
3 is driven, the coating liquid 27 guided from the coating liquid supply unit through the coating liquid supply line 24 to the coating liquid inlet 4 passes through the coating liquid supply pipe 22 near the center of the rotating disk 18. It is supplied to the upper surface, and is scattered in the outer peripheral direction by centrifugal force accompanying the rotation of the rotating disk 18 to be miniaturized and fused. At this time, since the inside of the vacuum tank I is in a vacuum, the coating liquid 27 which has been miniaturized and has an increased surface area is exposed to a vacuum, so that the mixed air bubbles are ruptured and removed. Also, the coating liquid 27 scattered in the outer circumferential direction
However, when it collides with the collision plate 21 fixed on the innermost peripheral side, the air bubbles mixed therein are destroyed by the impact force. The coating liquid 27 that has collided with the collision plate 21 is then dropped on the rotating disk 18 by its own weight.
Due to the centrifugal force accompanying the rotation of 8, the particles are scattered again in the outer peripheral direction.

Thereafter, the coating liquid 27 which has been scattered in the outer peripheral direction and has reached the inner peripheral surface of the mesh plate 19 on the innermost peripheral side.
Is caused by the centrifugal force caused by the rotation of the mesh plate 19.
9 is allowed to pass to the outer peripheral side. At this time, solid components and solid foreign matters cannot pass through the mesh of the mesh plate 19 but remain on the inner circumferential surface side of the mesh plate 19, and are separated from the coating liquid 27. Will be done.

Thereafter, the coating liquid 27 that has passed through the innermost mesh plate 19 is made to collide again with the collision plate 21 on the outer peripheral side to cause bubble breakage. And, by passing through the mesh of the outermost mesh plate 19, solid components and solid foreign matter are removed. Thereafter, the coating liquid 27 that has passed through the mesh of the outermost mesh plate 19 is centrifuged. The bubbles are made to collide with the inner wall surface of the tank body 1, and the bubbles are ruptured and removed by the collision force acting here as well.
The coating liquid 27 hitting the inner wall surface of the tank body 1 is caused to flow down along the inner wall surface of the tank body 1 by its own weight, and is stored in the lower part of the tank body 1. Thus, the coating liquid 27 stored in the lower portion of the tank body 1 is sufficiently stirred, solid components and solid foreign matters are removed, and bubbles are removed. Therefore, when the coating liquid delivery pump 25 is driven to discharge the coating liquid 27, the coating liquid 27 containing no solid component or solid foreign matter and containing no air bubbles flows downstream through the coating liquid delivery line 26. It will be fed to the coating device connected to the side.

When the stirring operation of the coating liquid 27 as described above is continuously performed for a long time, the coating liquid 27
The solid component and the solid foreign matter separated from the liquid are accumulated. In this case, stop the operation of the coating liquid stirring device,
By opening the lid 3 of the vacuum tank I by the operation of the actuator 12, the rotating disk 18 and the mesh plate 19 attached to the lid 3 via the support member 13 and the rotary drive shaft 14 are placed outside the vacuum tank I. The solid component or solid foreign matter that has been taken out and accumulated on the inner peripheral surface side of the mesh plate 19 may be cleaned.

As described above, according to the stirring apparatus of the present invention,
Since the coating liquid 27 can be stirred to sufficiently dissolve the components, and at the same time, solid components and solid foreign matter can be removed, and the air bubbles mixed therein can be broken and removed, Conventionally, a filter or a bubble removing device that has to be separately provided on the downstream side can be eliminated.

Note that the present invention is not limited to the above embodiment. For example, in the embodiment shown in FIG. Corresponding to this, the collision plate 21 is installed in two stages in the radial direction. However, the number of installations of the mesh plate 19 and the collision plate 21 in the radial direction can be increased or decreased, or each stage can be provided one by one. The number of stages can be freely set according to the diameter of the tank I.
If the effect of stirring and destruction of air bubbles can be sufficiently obtained by scattering in the outer peripheral direction on the surface 8 and passing through the mesh plate 19 to collide with the inner wall surface of the tank body 1, the collision plate 21 may be omitted. Good thing, and the fixed disk 20
May be attached via a support member at an arbitrary position on the inner surface of the present invention, and can be used for stirring the coating liquid 27 for supplying to various types of coating apparatuses other than the curtain coater. Of course, various changes can be made without departing from the gist.

[0022]

As described above, according to the coating liquid stirring apparatus of the present invention, the lid having the coating liquid inlet and the vacuum suction port is provided at the upper end of the tank body having the coating liquid outlet at the lower end. A rotatable drive shaft is vertically penetrated and rotatably supported at the center of the lid of the vacuum tank, which is openably and closably provided, and the inside of which can be evacuated by a vacuum pump connected to the vacuum suction port. And, inside the tank body, a rotating disk having a net-like plate in the circumferential direction on the upper surface of the peripheral portion is arranged in a horizontal state, and the lower end of the rotary drive shaft is provided at the center of the rotating disk. Further, the upper end of the rotary drive shaft is connected to a drive device on the lid, and the other end of the coating liquid supply pipe having one end connected to the coating liquid inlet is connected to the center of the rotating disk. The coating solution supplied on the rotating disk is moved to the surrounding area by centrifugal force. Because there is a structure in which to so that,
The coating liquid supplied from the coating liquid inlet is guided onto the rotating disk through the coating liquid supply pipe, and can be scattered in the outer peripheral direction by centrifugal force accompanying the rotation of the rotating disk to be refined. At this time, since the inside of the vacuum tank is evacuated, the coating liquid, which has been miniaturized and has an increased surface area, can be exposed to vacuum to rupture and remove the air bubbles mixed in. The coating liquid scattered in the outer peripheral direction on the rotating disk is passed through the mesh of the mesh plate by centrifugal force and collides with the inner wall surface of the tank body from the rotating disk, so that solid components and solid The defoaming of the coating liquid from which the foreign matter has been separated and removed is effectively performed, and therefore, the coating liquid is sufficiently stirred from the coating liquid outlet, and does not contain solid components or solid foreign matter and does not contain bubbles. Can be sent out,
It has an excellent effect of eliminating the need for a filter or bubble removal device that had to be separately provided on the downstream side, and at the upper position of the rotating disk inside the tank body, on the lower surface of the peripheral part A horizontal fixed disk having a collision plate in the circumferential direction is arranged so that the collision plate of the fixed disk radially faces the mesh plate provided on the upper surface of the rotating disk, and the fixed disk is Is attached to the inside of the lid via the support member, the coating liquid scattered in the outer peripheral direction due to the centrifugal force accompanying the rotation of the rotating disk can collide with the collision plate, Bubbles mixed inside can be destroyed by the impact force at the time of collision, and the bubble removing effect can be enhanced.Furthermore, the mesh plate provided on the upper surface of the rotating disk and the fixed disk The collision plate provided on the lower surface is provided in multiple stages in the radial direction. With the structure, solid components and solid foreign matter removing effect, and exerts effect that it is possible to further improve the effect of removing bubbles.

[Brief description of the drawings]

FIG. 1 is a schematic sectional side view showing an embodiment of a coating liquid stirring device of the present invention.

FIG. 2 is a schematic diagram showing a curtain coater as an example of a coating apparatus.

[Explanation of symbols]

 I Vacuum tank 1 Tank body 2 Coating liquid outlet 3 Lid 4 Coating liquid inlet 5 Vacuum suction port 8 Vacuum pump 14 Rotary drive shaft 17 Driving motor (drive device) 18 Rotating disk 19 Mesh plate 20 Fixed disk 22 Coating liquid supply pipe 27 Coating liquid

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Kono 1-Shin Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima Harima Heavy Industries, Ltd. Yokohama Engineering Center F-term (reference) 4G036 AC38 4G078 AA03 AB05 BA05 CA05 CA01 CA05 CA12 CA17 DA23 EA01 EA10

Claims (3)

[Claims] 1. A tank having a coating liquid outlet at its lower end and a lid having a coating liquid inlet and a vacuum suction port provided at the upper end of the tank body so as to be openable and closable. At the center of the lid of the vacuum tank, which can be evacuated, a rotary drive shaft is vertically penetrated and rotatably supported, and inside the tank body,
A rotating disk having a mesh-shaped plate in the circumferential direction is arranged in a horizontal state on the upper surface of the peripheral portion, and the lower end of the rotating drive shaft is fixed to the center of the rotating disk, and further, the rotating drive shaft Is connected to the drive unit on the lid, and the other end of the coating liquid supply pipe, one end of which is connected to the coating liquid inlet, faces the upper surface near the center of the rotating disk. A coating liquid stirring device having a configuration in which the coating liquid supplied to the device is moved to a peripheral portion by centrifugal force. 2. A horizontal fixed disk having a collision plate in the circumferential direction on the lower surface of the peripheral portion, at a position above the rotation disk inside the tank body, wherein the collision plate of the fixed disk is the rotation disk. The coating liquid stirring device according to claim 1, wherein the coating liquid stirring device is arranged so as to face radially with a net-like plate provided on the upper surface of the device, and the fixed disk is attached to the inside of the lid via a support member. 3. The coating liquid stirring device according to claim 2, wherein a mesh plate provided on the upper surface of the rotating disk and a collision plate provided on the lower surface of the fixed disk are provided in a plurality of stages in the radial direction.