JP3399881B2 - Intermittent supply valve and intermittent application device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent supply valve and an intermittent application device used for intermittently applying a liquid such as a synthetic resin liquid or a paint to an object to be applied at a predetermined interval.

[0002]

2. Description of the Related Art Generally, in a lithium-ion battery manufacturing process, when an electrode material such as graphite, coke, carbon fiber or the like is intermittently applied to a base material such as a long aluminum foil or copper foil at predetermined intervals, Alternatively, when a liquid such as a synthetic resin liquid or a paint is applied to the surface of a long synthetic resin film or paper, for example, a liquid storage tank and a liquid transfer tank as described in JP-A-10-76209 An intermittent coating device is used in which a pump and an intermittent supply valve having a liquid pullback mechanism and a liquid discharge slit die are connected in this order by a liquid delivery pipe.

The intermittent supply valve includes a valve body 50 having a liquid inlet storage chamber 50-1 and a liquid outlet storage chamber 50-2 with a valve seat 51 as shown in FIG. 9, and a valve body 50.
A cylinder 52 having a compressed air chamber 52-1 and a compressed air chamber 52-2 sandwiching the piston 53, and a valve body 54 integrally attached to the shaft portion 53-1 of the piston 53. When the valve body 54 moves toward the valve seat 51 to stop the supply of the liquid, a negative pressure is generated on the liquid outlet side storage chamber 50-2 side.

[0004]

In the supply valve as described above, a negative pressure is generated when the supply of the liquid is stopped, so that the liquid can be prevented from dripping from the slit die. However, when the supply of liquid is started, the amount of supply to the slit die increases momentarily because it becomes a pressurized state due to the movement of the valve body, and only the first part becomes extremely thick, resulting in uneven coating thickness. There is.

Further, in order to solve the above-mentioned problems, when the amount of compressed air supplied to the cylinder is adjusted to control the moving speed of the piston, there is a delay in the pressure adjustment on the inlet side and the outlet side of the liquid. However, there is a problem that the coating thickness is uneven.

It is an object of the present invention to provide an intermittent supply valve in which unevenness of the supply amount hardly occurs at the start of liquid supply and an intermittent coating device in which unevenness of coating thickness hardly occurs.

[0007]

According to the intermittent supply valve of the present invention, when the liquid supply is stopped as described in claim 1, the valve body is moved to generate a negative pressure on the downstream side to supply the liquid. When starting, the valve element is separated from the valve seat by the liquid and positive pressure is applied.
The pressure waveform changes especially immediately after the start of supply.
Or the liquid supply is temporarily high when the liquid supply is started.
It is designed to have a uniform amount at all times .

[0008] Intermittent supply valve of the present invention are the configuration in which allowed mounted so as to be movable in the axial longitudinal direction the valve member relative to the piston as described in claim 2. Further, the shaft portion of the piston for mounting the valve body as described in claim 3 is present in the liquid inlet side chamber and the liquid outlet side chamber formed by sandwiching the valve seat, configuration shank to the piston and co <br/> was allowed formed so that the liquid amount in each chamber to move in the axial longitudinal direction is not changed, the valve body as claimed in claim 4, the valve seat From the valve member that abuts against the valve member
A large-diameter disk can be used to form the structure.

The intermittent coating apparatus of the present invention is an apparatus in which a liquid storage tank, a liquid feed pump, and a liquid discharge die are connected by a liquid feed pipe in the above-mentioned order as described in claim 5. The intermittent supply valve according to any one of claims 1 to 4 is provided between the liquid pump and the die .

[0010]

1 is a schematic view showing an embodiment of the structure of an intermittent coating device provided with an intermittent supply valve according to the present invention. The intermittent coating device is a liquid storage tank 1 and a liquid feed pump. 2, an intermittent supply valve 3 having a liquid pullback mechanism, and a liquid discharge slit die 4 in this order, a liquid sending pipe 5,
6 and 7, the liquid storage tank 1 and the liquid delivery pipe 6 are connected by a return pipe 8 having a gate valve 9.

As shown in FIG. 2, the intermittent supply valve 3 has a valve body 11 having a liquid inlet side storage chamber 11-1 and a liquid side storage chamber 11-2 with a valve seat 12 interposed therebetween, and the valve body. 1
1, a cylinder 13 having a compressed air chamber 13-1 and a compressed air chamber 13-2 sandwiching the piston 14, and a valve body attached to a shaft portion 14-1 of the piston 14 so as to be movable in the axial center longitudinal direction. 15 and 15. The valve body 15 is formed by a valve member 15a that abuts on the valve seat 12 and a disk 15b having a small thickness and a large diameter, and is moved by a nut 16 screwed to the tip of the shaft portion 14-1 of the piston 14. The amount has come to be regulated.

The plate thickness dimension and outer diameter dimension of the circular plate 15b are appropriately set depending on the viscosity of the coating liquid, the required negative pressure, and the like.
Further, the valve member 15a and the disc 15b can be configured to be movable in a separated state or can be configured to move as an integrated body. By providing the disc 15b, a conventional valve body can be obtained. A large negative pressure can be obtained as compared with.

The inlet side storage chamber 11-1 of the valve body 11 described above.
A liquid supply pipe 6 is connected to the outlet storage chamber 11-2, and a liquid supply pipe 7 is connected to the outlet storage chamber 11-2.

A compressed air supply pipe (not shown) having an electromagnetic switching valve, a pressure regulator, etc. is connected to the compressed air chambers 13-1 and 13-2, and the piston 14 is switched by switching the compressed air supply position. It is designed to reciprocate.

A seal member 17 for preventing leakage is attached to either the valve body 11 or the cylinder 13 at the support portion of the valve body 11 and the shaft portion 14-1 of the cylinder 13 described above. It is possible to use the seal member 17 as a support member for the shaft portion 14-1.

The liquid supply / stop operation in the intermittent supply valve 3 is such that the liquid supply is stopped as shown in FIGS. 4 to 7 (FIG. 4), and the compressed air is supplied to the compressed air chamber 13-1. When the piston 14 is moved in the direction (A) due to this, the valve body 1
5 is in a state in which the shaft portion 14-1 has moved while still in contact with the valve seat 12 (FIG. 5), and then the valve body 15 is pressed by the liquid (liquid pressure) sent by the liquid sending pump 2 The liquid in the inlet-side storage chamber 11-1 separated from the valve seat 12 moves to the outlet-side storage chamber 11-2 through the space between the valve seat 12 and the valve body 15 and is supplied to the slit die (Fig. 6) When the compressed air is supplied to the compressed air chamber 13-2 and the piston 14 moves in the (B) direction (FIG. 7), the valve body 15 moves integrally with the piston 14 toward the valve seat 12 and Returning to the state of 4, the liquid supply is stopped.

[0017] positive pressure has moved to (A) the direction of the above-mentioned valve body 15 (opening) sometimes exit side storage chamber 11-2 (the downstream side) can occur
When the valve body 15 is moved to the (B) direction (closed), the liquid in the outlet storage chamber 11-2 is pulled back and the outlet storage chamber 1
Negative pressure is generated within 1-2.

A liquid was applied to the base material for a lithium-ion storage battery by the above intermittent application device under the following conditions.

Coating liquid supply pressure: 1.2 kg / cm2G Coating liquid viscosity: 10000 cps Coating speed: 5 m / min Coating thickness: 120 μm Coating width: 580 mm Coating length: 300 mm / Uncoated length: 50-100 mm Under the above conditions When the pressure inside the slit die 4 was measured and recorded when the intermittent coating was performed, the pressure waveform was as shown in FIG. The pressure waveform does not change particularly immediately after the start of coating, and the thickness change at the start of coating is ± 3 μm.
The length until reaching a predetermined thickness is about 3 to 5 mm, and it can be seen that the valve body of the intermittent supply valve 3 operates smoothly.

When the pressure in the slit die 4 when intermittent coating was performed under the same conditions as above using a conventional intermittent supply valve was measured and recorded, a pressure waveform as shown in FIG. 10 was obtained. The pressure waveform changes drastically immediately after the start of coating to cause a thick portion at the extreme part, which causes a fatal defect such as breakage in a post process such as a winding process and a pressing process.

Therefore, if the moving speed of the valve body 54 at the start of coating is slowed down so that a thick portion is not locally produced,
As shown in FIG. 11, it takes a considerably long time for the pressure waveform to stabilize. At this time, the thickness change at the start of coating is −
It is about 10 to 20 μm, and it takes about 20 to reach the specified thickness.
It took ~ 50 mm.

From the above measurement results, when the intermittent supply valve 3 of the present invention is used, it is possible to prevent a temporary increase in the supply amount at the start of the supply of the liquid and to always supply a uniform amount of the liquid. Further, according to the intermittent coating device using the intermittent supply valve 3 of the present invention, a coated material having a uniform thickness can be obtained.

Instead of the intermittent supply valve 3 described above, the shaft portion 19-1 of the piston 19 as shown in FIG.
9-1 is a liquid inlet side chamber 1 formed by sandwiching the valve seat 12
8-1 and the outlet side chamber 18-2, the tip end portion of which is movably supported by the seal member 20 of the valve body 18 or a bearing, and the shaft portion 19-1 together with the piston 19 in the axial longitudinal direction. It is possible to adopt a configuration in which the amount of liquid in each of the chambers 18-1 and 18-2 does not change even when moved.

If such a shaft portion 19-1 is present in the outlet side chamber 18-2, the liquid amount in the outlet side chamber 18-2 does not change even if the shaft portion 19-1 moves (the shaft side 19-1 If there is no difference in diameter, the amount of liquid does not change, but if there is a difference in shaft diameter, a volume difference occurs due to the difference in shaft diameter.), FIG.
With the intermittent supply valve 3 shown in FIG. 3, it is possible to further reduce the change in the supply amount at the start of the liquid supply.

The intermittent supply valve of the present invention is disclosed in JP-A-63-
It goes without saying that it can be used for a liquid coating device as described in Japanese Patent Application Laid-Open No. 91164 or Japanese Patent Laid-Open No. 10-76209, or an intermittent coating device having a coating member other than that.

[0026]

According to the intermittent supply valve of the present invention, when the liquid supply is stopped as described in claim 1, when the valve body is moved to generate a negative pressure on the downstream side, the liquid supply is started. When the valve body is separated from the valve seat by the liquid , positive pressure is generated
Immediately after starting, the pressure waveform does not change or the liquid
The supply amount does not increase temporarily at the start of body supply.
Since the amount of liquid is set to be large, it is possible to always supply a uniform amount of liquid in which unevenness in the supply amount hardly occurs at the start of liquid supply.

An intermittent supply valve of the present invention comprises a piston having a valve body as set forth in claim 2, a valve seat whose liquid passage is closed by the valve body, and a moving means for moving the piston. , 2-way valve to supply or stop liquid
In Bed, since the structure was allowed mounted so as to be movable in the axial longitudinal direction of the valve body relative to the piston,
Supply amount when starting the supply of the liquid Ki de be reliably prevented temporarily increased to supply the constantly uniform amount of liquid
be able to. Further, the intermittent supply valve of the present invention has a piston shaft portion for mounting a valve body as defined in claim 3 in a liquid inlet side chamber formed by sandwiching the valve seat. present in the outlet side chamber, when the shaft portion to the piston and co <br/> is to configure the liquid amount in each chamber be moved in the axial longitudinal direction is allowed formed so as not to change, the liquid
The supply amount does not change abruptly during the supply start operation, and it is possible to more reliably prevent the supply amount from temporarily increasing at the start of the supply. When the valve member that abuts and the disc having a diameter larger than that of the valve member are used, it is larger than that of the valve member alone.
A negative pressure can be obtained, and a negative pressure corresponding to the applied liquid can be easily and surely obtained, and the liquid drips.
It is possible to prevent the reliability.

The intermittent coating apparatus of the present invention is an apparatus in which a liquid storage tank, a liquid feed pump, and a liquid discharge die are connected in this order by a liquid feed pipe as described in claim 5, Since the intermittent supply valve according to one of claims 1 to 4 is provided between the liquid pump and the die, the liquid supply amount is temporarily changed at the start of coating. Does not increase, and there is no coating spot and it is uniform at all times
It is possible to apply a large amount of liquid and stop the liquid supply.
Prevents liquid dripping due to negative pressure when stopped
It is possible to obtain a coated article having a uniform thickness from the start of coating to the end of coating.

[Brief description of drawings]

FIG. 1 is a schematic view showing one embodiment of the structure of an intermittent coating device of the present invention.

FIG. 2 is a schematic sectional view showing a first embodiment of the structure of the intermittent supply valve of the present invention.

FIG. 3 is a schematic cross-sectional view showing a second embodiment of the structure of the intermittent supply valve of the present invention.

[Fig. 4]

[Fig. 5]

[FIG. 6]

7 is a schematic diagram showing a liquid supply / stop operation of the intermittent supply valve of FIG. 2. FIG.

FIG. 8 is a schematic view showing a state of pressure in the slit die when liquid is supplied and stopped by the intermittent supply valve of the present invention.

FIG. 9 is a schematic cross-sectional view showing one embodiment of the structure of a conventional intermittent supply valve.

10 is a schematic diagram showing a state of pressure in the slit die when the liquid is supplied and stopped by the conventional intermittent supply valve under the same conditions as in FIG.

FIG. 11 is a schematic view showing a state of pressure in the slit die when the conventional intermittent supply valve is operated with the moving speed of the valve body at the start of coating slower than in FIG.

[Explanation of symbols]

1 liquid storage tank 2 Pump for sending liquid 3 Valve for intermittent supply 4 slit die 5, 6, 7 Liquid delivery piping 8 Return pipe 9 gate valve 11, 18 Valve body 12 seat 13 cylinders 14, 19 pistons 15 valve body 16 nuts 17, 20 Seal member 11-1, 18-1 Inlet storage chamber 11-2, 18-2 Delivery side storage chamber 13-1, 13-2 Pneumatic chamber 14-1, 19-1 Shaft 15a Valve member 15b disc

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-10-192763 (JP, A) JP-A-61-244971 (JP, A) Actually open 63-1971 (JP, U) Actual-open Sho-62- 103475 (JP, U) JP-B 7-41185 (JP, B2) JP-B 63-23435 (JP, B1) JUKI 2-27902 (JP, Y2) JUKI 3-31876 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B05C 11/10 B05C 5/02 B05D 5/06 101 B05D 7/04

Claims (5)

(57) [Claims] 1. In a two-way valve for supplying or stopping a liquid, when stopping the supply of the liquid, the valve body is moved to generate a negative pressure on the downstream side, and when starting the supply of the liquid, the valve body is the liquid. Supply away from the valve seat due to positive pressure
Immediately after, the pressure waveform does not change or the liquid supply
A constant amount that does not temporarily increase at the start of feeding
A valve for intermittent supply characterized by being configured as follows. A piston having a 2. A valve element, a valve seat fluid passage is closed by the valve body, and a moving means for moving the piston, the two-way valve which supplies or stops the liquid, the valve A contract characterized in that the body is attached to the piston so as to be movable in the axial longitudinal direction.
The valve for intermittent supply according to claim 1 . Wherein the shaft portion of the piston for attaching the valve body, the shaft portion is present on the inlet side chamber and an outlet side chamber of the liquid formed across the valve seat, both the shaft portion and the piston The intermittent supply valve according to claim 2, wherein the valve is formed so that the amount of liquid in each chamber does not change even if the valve is moved in the longitudinal direction of the axial center. 4. A valve member for contacting a valve body with a valve seat, and the valve member.
The intermittent supply valve according to claim 2 or 3, wherein the valve is formed by a disk having a larger diameter . 5. An apparatus in which a liquid storage tank, a liquid feed pump, and a liquid discharge die are connected by a liquid feed pipe in the order mentioned above, and between the liquid feed pump and the die.
An intermittent coating apparatus comprising the intermittent supply valve according to any one of claims 4 to 4.