JP2001191005A - Intermittent coating device and intermittent coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the nonuniformity of the thickness of a film formed by intermittently applying a coating material on a base material and the thick coating at the starting edge part, which are caused in the conventional intermittent coating device. SOLUTION: This intermittent coating device is provided with a nozzle 1 for applying the coating material 6 on the base material, a supply side two way valve 10 for repeating the supplying and the stopping of the coating material 6 to a flow passage 12 of the coating material, a return side two way valve 11 for repeating the discharge and the stopping of the coating material 6 to the return side, the flow passage 12 of the coating material, a supply means for supplying the coating material 6 to the flow passage 12 and a coating material withdrawing means 5 for repeating the sucking and the returning of the coating material 6 inside the nozzle 1 by the movement of a piston 501 provided inside the nozzle 1 and at least the switching of the supply side two way valve 10 in the starting of the coating is operated in the range of 5 to 100 msec earlier than the switching of the return side two way valve 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent application apparatus and an intermittent application method for intermittently applying a coating material on a continuously running substrate.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 7-311997 discloses an apparatus for intermittently applying a coating material to a continuously running substrate. This is because the base material in the battery field is wound on a back roll, a nozzle is provided at a position facing the back roll, and the supply and stop of the paint to the nozzle are repeated, so that the part where the paint is not applied on the base material is provided. That is, a method of providing a lead weld.

[0003]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open
When the battery paste is intermittently applied as a paint to the current collector by the application means of JP-311997, as shown in FIG. 7, the thickness of the current collector in the running direction from the start of application of the active material layer to about 20 mm in the running direction of the current collector. Was applied in a thickness of about 30 to 100 μm, and the active material layer in the thickly applied portion was peeled off during the subsequent rolling in some cases. This is because the supply path and the return path are instantaneously opened at the time of switching between the supply path and the return path at the time of intermittent movement of the head as the intermittent means, so that the paint on the return side is supplied on the supply side, that is, inside the nozzle. Overflow into the Therefore, only the amount of paint that has excessively flowed into the nozzle at the start of coating is applied thickly.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an intermittent coating apparatus and a method in which a coating is formed intermittently on a substrate and has a uniform thickness in a longitudinal direction and can suppress thick coating at a coating start end.

[0005]

Means for Solving the Problems The first invention (claim 1)
Is provided with a nozzle for applying a paint on a substrate, and intermittent means for repeating supply and stop of the paint to the nozzle and repeating discharge and stop of the paint to a return side. An intermittent coating apparatus, wherein at least at the start of coating, the intermittent means starts discharging paint to the nozzles, and then stops discharging paint to the return side. It is.

According to a second aspect of the present invention (corresponding to claim 2), the timing of starting the supply of the paint to the nozzle is 5 ms from the timing of stopping the discharge of the paint to the return side.
A first intermittent coating apparatus according to the first aspect of the present invention, which is fast within a range from ec to 500 msec.

According to a third aspect of the present invention (corresponding to claim 3), the timing of starting the supply of the paint to the nozzle is 5 ms from the timing of stopping the discharge of the paint to the return side.
A first intermittent coating apparatus according to the first aspect of the present invention, which is fast within a range from ec to 100 msec.

According to a fourth aspect of the present invention (corresponding to claim 4), the intermittent means operates using a two-way valve or a three-way valve. This is an intermittent coating device.

According to a fifth aspect of the present invention (corresponding to claim 5), a nozzle for applying a coating material on a substrate, the supply and stop of the coating material to the nozzle are repeated, and the coating material is applied to a return side. Intermittent means for repeating discharge and stop, at least at the end of coating, the intermittent means stops discharge of the paint to the nozzle, and then starts discharge of the paint to the return side. Intermittent coating device.

According to a sixth aspect of the present invention (corresponding to claim 6), the timing of stopping the supply of the paint to the nozzle is 0 m more than the timing of starting the discharge of the paint to the return side two.
A fifth aspect of the present invention is an intermittent coating apparatus according to the fifth aspect, wherein the speed is faster within a range of not less than sec and not more than 100 msec.

A seventh aspect of the present invention (corresponding to claim 7) further comprises a paint retraction means for sucking the paint in the nozzle and returning the paint to the interior of the nozzle.
The paint retraction means returns the paint to the inside of the nozzle at the same time as the start of the supply of the paint to the nozzle at the start of the application, and at the same time as the timing of the stop of the supply of the paint to the nozzle at the end of the application. The intermittent coating device according to any one of the first to sixth aspects of the present invention, wherein the coating material is sucked from a nozzle.

An eighth aspect of the present invention (corresponding to claim 8) includes intermittent means for intermittently supplying paint to a nozzle, and paint retraction means for repeating suction and return of the paint inside the nozzle. In the intermittent coating apparatus, the relationship between the operation time A for sucking the paint from inside the nozzle and the operation time B for returning the paint to the inside of the nozzle is A.
<B, an intermittent coating device.

According to a ninth aspect of the present invention (corresponding to a ninth aspect), the amount of paint sucked from the inside of the nozzle is 0.01 cc or more.
A seventh or eighth aspect of the present invention, wherein the intermittent coating device is in the range of cc or less.

According to a tenth aspect of the present invention (corresponding to claim 10),
The flow rate of the paint returned to the inside of the nozzle is 1 cc / msec.
A seventh, eighth, or ninth aspect of the present invention is an intermittent coating apparatus according to the present invention.

An eleventh invention (corresponding to claim 11) is:
The operation of the paint pull-back means is performed using a piezoelectric element, and is an intermittent coating apparatus according to any one of the first to tenth aspects of the present invention.

According to a twelfth aspect of the present invention (corresponding to claim 12),
An intermittent means for intermittently supplying a paint to a nozzle; and a paint retraction means for repeating suction and return of the paint in the nozzle by a vertical movement of a bellofram provided in the nozzle. It is a coating device.

A thirteenth invention (corresponding to claim 13) is:
The twelfth aspect of the present invention is characterized in that the amount of the paint sucked from the inside of the nozzle is in a range of 0.01 cc or more and 10 cc or less.
Is an intermittent coating device of the present invention.

The fourteenth invention (corresponding to claim 14) is:
A nozzle for applying a paint on a base material, and an intermittent coating device including an intermittent means for repeating supply and stop of the paint to the nozzle and intermittent means for repeating discharge and stop of the paint to a return side. Wherein the intermittent means is a supply-side two-way valve that repeats supply and stoppage of the paint to the nozzle,
A return-side two-way valve that repeats discharge and stop of the paint to the return, and a flow path for the paint are provided, and the supply-side two-way valve and the return-side two-way valve can individually control the operation. An intermittent coating device comprising a control unit.

According to a fifteenth aspect of the present invention (corresponding to claim 15),
At least the return-side two-way valve has a configuration that shuts off or opens the flow path by movement of a piston,
A fourteenth aspect of the present invention is the intermittent application device according to the fourteenth aspect, wherein the moving direction of the piston at the time of shutoff coincides with the flow of the paint to the return.

According to a sixteenth aspect of the present invention (corresponding to claim 16),
A switching timing of the supply-side two-way valve at least at the start of coating is earlier than a switching timing of the return-side two-way valve within a range of 5 msec or more and 500 msec or less. It is.

According to a seventeenth aspect of the present invention (corresponding to claim 17),
A switching timing of the supply-side two-way valve at least at the start of coating is earlier than a switching timing of the return-side two-way valve within a range of 5 msec or more and 100 msec or less. It is.

An eighteenth aspect of the present invention (corresponding to claim 18) is:
The amount of the paint sucked from the inside of the nozzle is in the range of 0.01 cc or more and 10 cc or less.
Is an intermittent coating device of the present invention.

According to a nineteenth aspect of the present invention (corresponding to claim 19),
A nozzle for applying paint on a substrate, intermittent means for repeating supply and stop of the paint to the nozzle, and intermittent means for repeating discharge and stop of the paint to a return side, and the nozzle and the intermittent means And a mixer provided in a flow path between the intermittent coating device and the intermittent coating device.

According to a twentieth aspect of the present invention (corresponding to claim 20),
A nineteenth aspect of the present invention is the intermittent coating apparatus according to the nineteenth aspect, wherein the length of the mixer is 1 mm or more and 200 mm or less.

According to a twenty-first aspect of the present invention (corresponding to claim 21),
A nineteenth aspect of the present invention is the intermittent coating apparatus according to the nineteenth aspect, wherein a diameter of the mixer is 5 mm or more and 100 mm or less.

According to a twenty-second aspect of the present invention (corresponding to claim 22),
A nozzle for applying a paint on a substrate, and an intermittent coating device including an intermittent means for repeating supply and stop of the paint to the nozzle, and intermittent means for repeating discharge and stop of the paint to a return side. An intermittent coating method of performing intermittent coating using a method, wherein at least at the start of coating, the intermittent means starts discharging paint to the nozzles, and then stops discharging paint to the return side. Intermittent application method.

According to a twenty-third aspect of the present invention (corresponding to claim 23),
A nozzle for applying a paint on a substrate, and an intermittent coating device including an intermittent means for repeating supply and stop of the paint to the nozzle, and intermittent means for repeating discharge and stop of the paint to a return side. An intermittent coating method of performing intermittent coating using the method, wherein at least at the end of the coating, the intermittent means stops the supply of the paint to the nozzle, and then starts discharging the paint to the return side. This is a characteristic intermittent coating method.

According to a twenty-fourth aspect of the present invention (corresponding to claim 24),
Intermittent coating that performs intermittent application using an application device of an intermittent application device that includes intermittent means for intermittently supplying paint to a nozzle and paint retraction means for repeating suction and return of the paint inside the nozzle. The intermittent coating method, wherein a relationship between an operation time A for sucking the paint from inside the nozzle and an operation time B for returning the paint to the inside of the nozzle is A <B.

According to a twenty-fifth aspect of the present invention (corresponding to claim 25),
Utilizing intermittent means for intermittently supplying paint to the nozzle,
In the intermittent application method for performing intermittent application, it is possible to repeat suction and return of the paint inside the nozzle by vertically moving a bellofram provided inside the nozzle.

According to a twenty-sixth aspect of the present invention (corresponding to claim 26),
A nozzle for applying a paint on a substrate, and an intermittent coating device including an intermittent means for repeating supply and stop of the paint to the nozzle, and intermittent means for repeating discharge and stop of the paint to a return side. An intermittent application method of performing intermittent application using a supply-side two-way valve that constitutes the intermittent means and repeats supply and stop of the paint to the nozzle, and discharge and stop of the paint to a return. The intermittent coating method is characterized in that the return-side two-way valve that is repeated is individually controlled.

According to a twenty-seventh aspect of the present invention,
A nozzle for applying paint on a substrate, intermittent means for repeating supply and stop of the paint to the nozzle, and intermittent means for repeating discharge and stop of the paint to a return side, and the nozzle and the intermittent means And a mixer provided in a flow path between, and an intermittent coating method for performing intermittent coating using an intermittent coating device including the mixer, wherein the mixer causes a pressure loss. Intermittent coating method.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments.

(Embodiment 1) FIG. 1 is a schematic view showing one embodiment of a coating apparatus and method according to a first embodiment of the present invention.

The nozzle 1 includes an upstream lip 101, a downstream lip 102, and a manifold 10 for storing the paint 6.
3 and a slit 104 for extrusion. The width of the slit 104 is indicated by G.

The driving unit 5 includes an air cylinder 502 for moving the piston 501 in the direction of arrow A or B.
And a jig 503 for mounting this to the nozzle 1. The paint 6 in the tank 7 is supplied from the tank 7 to the pump 8
Through the filter 9 and the intermittent means 100,
Is supplied to the manifold 103 and extruded from the slit 104.

The substrate 2 is supported by the back roll 4 and has a distance d from the tip of the downstream lip 102 of 50 to 500.
μm, and the distance d is appropriately set according to the paint viscosity. The paint 6 extruded from the slit 104 flows into this gap, and is applied and formed as a coating film on the base material 2.

Next, the operation of intermittently applying the coating material 6 on the substrate 2 at a predetermined pitch by the operation of the intermittent means 100 and the piston 501 will be described.

When the paint 6 is not desired to be applied, the supply side valve (not shown) of the intermittent means 100 is shut off, and at the same time, the return side valve (not shown) is opened and the paint sent from the pump 8 is opened. By switching the flow 6 from the supply side to the return side, the supply of the paint to the nozzle 1 is stopped. At the same time, the piston 501 is moved in the direction of arrow A,
The paint 6 existing in the slit 104 and the paint pool 61 is sucked.

This makes it possible to perform intermittent coating particularly at the end of the coating.

Next, when the application is resumed, the valve on the supply side of the intermittent means 100 is opened, and the operation of moving the piston 501 in the direction of arrow B to return the sucked paint to the inside of the nozzle is performed simultaneously. Is started, the valve on the return side of the intermittent means 100 is shut off, the flow of the paint 6 sent from the pump 8 is switched to the supply side, and the supply of the paint to the nozzle 1 is restarted.

By repeating this operation, stable intermittent coating can be performed at a predetermined pitch. In this embodiment, a two-way valve is used as an example of the intermittent means.

Next, the features of this embodiment will be described in detail.

The first feature is that two-way valves are provided on the supply side and the return side, respectively, as an example of the intermittent means 100 as shown in FIG.

At the time of resuming coating, the supply-side two-way valve 10 is switched from the return-side two-way valve 11 by 5 msec or more for 50 msec or more.
This is to operate quickly within a range of 0 msec or less. More preferably, it is 5 msec or more and 100 msec or less.

In the case where the switching of the supply-side two-way valve 10 is made faster than the return-side two-way valve 11 by 5 msec or less,
Until the supply side two-way valve 10 opens, the return side two-way valve 1
Because 1 is cut off, excess paint in the flow channel 12 flows in, the paint pressure rises, and the application start end becomes thick.

When the switching of the supply-side two-way valve 10 is made faster than the return-side two-way valve 11 by 500 msec or more, the opening operation of the supply-side two-way valve 10 is too early and the application is restarted. Since the return-side two-way valve 11 is not shut off, a sufficient amount of paint cannot be supplied, and the application start end is lightly coated.

At the end of coating, the supply-side two-way valve 10 is switched from the return-side two-way valve 11 by 0 msec or more.
It is desirable to operate quickly within the range of 00 msec or less.

If the switching of the supply-side two-way valve 10 is made earlier than the return-side two-way valve 11 by 0 msec or less, that is, simultaneously or later, the return-side two-way valve 10 is switched off until the supply-side two-way valve 10 is shut off. Since the valve 11 is opened, a predetermined amount of the paint cannot be supplied, and the paint is applied.

When switching of the supply side two-way valve 10 is made faster than the return side two-way valve 11 by 100 msec or more,
Since the operation of shutting off the supply-side two-way valve 10 is too early and the return-side two-way valve 11 does not open even though the coating is completed, the coating pressure increases until just before the coating is completed, and the coating end portion becomes thick. Become.

In this manner, in this embodiment, as shown in FIG. 8, it is possible to form a coating film having no swelling at the coating start end and having a very uniform thickness from the coating start end to the coating end. it can.

The intermittent means 100 includes, as shown in FIG. 1, a flow path 12 for the paint 6 supplied from the pump 8, supply and stop of the paint 6 to the nozzle 1, and discharge of the paint 6 to the return. A three-way valve 100 that repeats a stop and a stop. The piston 501 switches from a return side to a supply side at the start of coating.
The operation speed of the piston 501 for switching the supply speed from the supply side to the return side during intermittent application is 50 msec.
As described above, even when operated with a delay of 500 msec or less, a coating film having the form shown in FIG. 8 can be formed in the same manner as the two-way valve.

The second feature is that the piston 50 of the suction device 5
In the first repetitive operation, a shearing force is applied to the paint to break the aggregates, thereby suppressing the coating streaks.

The piston 501 is moved in the direction of arrow A by the suction device 5, and the slit 104 and the paint pool 6 are moved.
The amount of paint for sucking paint 1 is 0.01 cc or more.
It is important to make it extremely small, that is, 0 cc or less.

When the amount of the paint is less than 0.01 cc, the amount of suction is too small and the paint remains between the nozzle 1 and the base material 2 and the start and end of the application cannot be linearized.

When the amount of paint is more than 10 cc, air is drawn into the slit 105 simultaneously with the paint because the amount to be sucked is large. Because of the extrusion, the coating start end is disturbed, and the thickness variation becomes 10% or more due to manifold pressure fluctuation.

In the present embodiment, since there is no change in the manifold pressure, there is no variation in the amount of paint discharged from the nozzle, and a coating film having a uniform thickness can be formed from the start end to the end. The variation can be achieved within 1%.

Next, a case where a specific example of this embodiment is applied to a lithium ion secondary battery will be described.

The nozzle 1 is shown in FIG.
μm, slit gap G = 0.5 mm, coating width 4
80 mm. Supply-side two-way valve 10 at the start of coating
Is changed in the range of -150 to 510 msec from the shutoff operation timing of the return side two-way valve 11, and the amount of paint sucked into the nozzle is set to 0.0
It changed in the range of 05-11 cc.

As the negative electrode, a current collector was a copper foil having a thickness of 10 μm and a width of 500 mm, a paste for the negative electrode was a carbon material, CMC
A mixture obtained by kneading (carboxymethyl cellulose) and water was used.

First, an active material layer was intermittently applied on a current collector at a predetermined pitch of 300 to 400 mm using the apparatus of the present embodiment, and dried.

As the positive electrode, the current collector was an aluminum foil having a thickness of 20 μm and a width of 500 mm, and the paste for the positive electrode was LiCoO 2.
2. Kneaded conductive carbon black, fluorine resin, CMC and water were used.

First, an active material layer was formed intermittently at a predetermined pitch on the current collector according to the present embodiment, followed by drying. The obtained positive electrode and negative electrode plates were rolled to a predetermined thickness and then slit to a predetermined width to prepare a lithium ion secondary battery.

As a comparative example, the same intermittent coating was performed by a conventional intermittent coating apparatus. The obtained positive electrode and negative electrode plates were rolled to a predetermined thickness and then slit to a predetermined width to prepare a lithium ion secondary battery of a comparative example.

The following evaluation was performed on the electrode plate and the battery after the application and drying, and the effect of the present embodiment was confirmed.

(1) Thickness (rise) of coating start end The thickness of the active material layer was measured from a coating start end to 20 mm from a coating start end at 20 points of 1 mm pitch with a micrometer.
The difference between the maximum thickness and the minimum thickness at the coating start end was evaluated as the amount of swelling.

The results are summarized in (Table 1). Within the range of the present embodiment, the rising amount at the start end can be obviously eliminated, and it is understood that the battery electrode plate is good.

[0067]

[Table 1] (2) Rolling State The state of dropping of the active material layer due to peeling of the starting end when rolling to a predetermined thickness was compared by visual observation. As a result, within the range of the present embodiment, it is clear that the active material layer does not fall off due to the swelling of the starting end portion, and that it is favorable as a battery electrode plate.

(3) Cycle characteristics Constant conditions at normal temperature (discharge: current 1600 mA, final voltage 3 V, charging: current 160 mA, final voltage 4.2 V)
And the discharge capacity was measured, and the comparison was made by the number of times of charge and discharge (cycle) when the discharge capacity reached 90% of the initial discharge capacity.

FIG. 9 shows the results. The battery according to the present embodiment has clearly improved cycle characteristics as compared with the battery according to the conventional example.

As a result of the above evaluation, the effects of the present embodiment will be described below.

First, when the active material layer is formed intermittently on the current collector, the opening operation of the supply-side two-way valve 10 is performed earlier than the shut-off operation of the return-side two-way valve 11, especially at the start of coating. By doing so, it is possible to suppress the swelling of the application start end. Therefore, since the thickness of the active material layer can be extremely uniformly formed from the start to the end of the application, the production process of a lithium ion secondary battery or the like can be performed.
In particular, since the active material layer did not fall off during the rolling process, the product yield was significantly improved.

Secondly, since the piston 501 of the driving unit 5 is repeatedly operated, a large shearing force can be exerted on the paste inside the nozzle, and the agglomerates of the active material powder in the paste can be destroyed. Therefore, an active material layer in which the active material powder is uniformly dispersed and coating streaks are suppressed can be obtained.

As a result, it was possible to improve the cycle characteristics of the battery produced in this embodiment. In addition, the product yield was significantly improved.

(Embodiment 2) FIG. 3 is a schematic view of a coating apparatus and an apparatus for carrying out a method according to a second embodiment of the present invention.

This embodiment is characterized in that, in the driving section 5, the operating time Amsec of the piston 501 for drawing the paint 6 into the suction section (not shown) inside the nozzle and the piston returning the paint 6 in the suction section to the inside of the nozzle. Operating time Bm of 501
A <B with respect to sec.

Further, the driving of the piston 501 is characterized in that the piezoelectric element 502 is used. Further, a three-way valve is used as the intermittent means 100.

The structure other than the driving section 5 can be the same as that of the first embodiment, and the description is omitted here.

When the paint 6 is not applied, the intermittent means 10
By switching the flow of the paint 6 sent from the pump 8 to the return side by 0, the supply of the paint to the nozzle 1 is stopped, and at the same time, the piston 501 is moved in the direction of the arrow A by the piezoelectric element 502, and the slit 104 and the paint pool are accumulated. 6
The paint 6 existing in 1 is sucked.

Next, when the application is resumed, the flow of the paint 6 sent from the pump 8 by the intermittent means 100 is switched to the supply side to resume the supply of the paint to the nozzle 1 and at the same time, the operation of the piston 501 by the piezoelectric element 502. Over a longer period of time than the suction operation time.
1 is moved in the direction of arrow B. In this way, from the start of coating to the end of coating, the volume of the paint 6 sucked is gradually returned to the inside of the nozzle.

That is, if the operation time for drawing the paint 6 into the suction portion inside the nozzle by the piezoelectric element 502 by the piston 501 is Amsec and the operation time for returning the paint 6 from the suction portion to the inside of the nozzle is Bmsec, A> B In the case of (1), the drawn paint 6 is returned at a stroke at any time from the start of coating to the end of coating, so that the thickness variation of the coating film 3 in the longitudinal direction becomes large. Therefore, it is desirable that A <B.

Further, it is important that the flow rate of returning the paint 6 in the suction section to the inside of the nozzle is 1 cc / msec or more. The flow rate for returning the paint 6 in the suction section to the inside of the nozzle is 1 cc /
In the case of msec or less, the thickness variation of the coating film 3 in the longitudinal direction becomes large.

By setting it to 1 cc / msec or more,
Since the paint 6 sucked in any place from the start of the application to the end of the application is not returned, as shown in FIG. 8, there is no swelling of the application start end, and extremely from the application start end to the end. A coating film having a uniform thickness can be formed.

The effect of the present embodiment is exactly the same as that of the first embodiment.

(Embodiment 3) FIG. 4 is a schematic view of an apparatus for implementing a coating apparatus according to a third embodiment of the present invention.

The feature of the present embodiment is that the movement of the pin of the drive section 5 moves the belofram 501 to suck and discharge the paint 6 and the paint pool 61 inside the nozzle.

[0086] Other structures can be the same as those of Embodiment 1, and the description is omitted here.

In this embodiment, Velofram 501 is used.
Is fixed inside the nozzle, and the center of the bellofram 501 is moved in the direction of arrow A or B by a pin.

Therefore, the speed of suction and the return of the bellofram 501 can always be kept constant without being affected by the sliding resistance with the wall surface inside the nozzle. Can be greatly improved.

Otherwise, the same effects as in the first embodiment can be obtained.

(Embodiment 4) FIG. 5 is a schematic view of an apparatus for implementing a coating apparatus according to a fourth embodiment of the present invention.

The present embodiment relates to the structure of the two-way valve main body, and the other parts are the same as in the first embodiment, and will not be described.

In this embodiment, a means for sucking and discharging the paint 44 inside the nozzle by moving a piston (not shown) provided inside the nozzle,
4, a supply-side two-way valve 41 that repeats supply and stop, a return-side two-way valve 42 that repeats discharge and stop of the paint 44 to the return, a portion between the supply-side two-way valve 41 and the return-side two-way valve 42, and the like. And a flow path 43 connecting the two.

Further, the present embodiment has a configuration in which the flow path 43 is shut off or opened by the movement of the pistons 4101 and 4201, and the supply-side two-way valve 41 and the return-side two-way valve 42 are individually controlled by the electromagnetic valve 45. A control means for controlling the operation is provided.

Further, the moving direction of the piston 4201 at the time of shutoff is made to coincide with the flow of the paint 44 to the return.

When application is stopped, drive air is supplied from the solenoid valve 45 to the supply-side two-way valve 41 by a preset control signal (not shown), and the piston 4101 of the supply-side two-way valve 41 is moved in the direction of arrow B. And the supply of the paint 44 flowing in the nozzle direction through the flow path 43 is stopped, and at the same time, the driving air of the return-side two-way valve 42 is discharged from the solenoid valve 45, and the piston 4201 of the return-side two-way valve 42 is moved in the direction of arrow B. To discharge the paint 44 flowing through the flow path 43 in the return direction.

Next, at the start of coating, the driving air is supplied from the electromagnetic valve 45 to the supply-side two-way valve 41, the piston 4101 of the supply-side two-way valve 41 is moved in the direction of arrow A, and the paint flowing through the flow path 43 is moved. 44 is supplied in the nozzle direction, and at the same time, the driving air of the return side two-way valve 42 is discharged from the solenoid valve 45,
The piston 4201 of the return-side two-way valve 42 is moved in the direction of arrow A to stop discharging the paint 4 flowing through the flow path 43 in the return direction.

According to the present embodiment, the piston 4201 of the return-side two-way valve 42 at the start of coating is made to coincide with the flow of the paint 44 to the return.
The volume of the paint 44 corresponding to the movement of the nozzle does not excessively flow into the nozzle.

Further, when the coating is resumed, the supply-side two-way valve 10
5m from switching of return side two-way valve 11
It is extremely important to operate quickly within a range of not less than sec and not more than 500 msec.

More preferably, the time is 5 msec.
Above, it is set to 100 msec or less.

When the switching of the supply-side two-way valve 10 is less than 5 msec from the return-side two-way valve 11, the supply-side two-way valve 1
Since the return-side two-way valve 11 shuts off before 0 is opened, excess paint in the flow channel 12 flows in, the paint pressure rises, and the application start end becomes thick.

When the switching of the supply-side two-way valve 10 is performed for 500 msec or more than the switching of the return-side two-way valve 11, the opening operation of the supply-side two-way valve 10 is too early and the application is restarted. Since the return-side two-way valve 11 is not shut off, a predetermined amount of paint cannot be supplied and the paint is applied, so that the application start end is lightly coated.

At the end of coating, the supply-side two-way valve 10 is switched 0 ms longer than the return-side two-way valve 11.
It is important to operate quickly within the range of ec to 100 msec.

If the switching of the supply-side two-way valve 10 is made 0 msec or less than the switching of the return-side two-way valve 11, the return-side two-way valve 11 is opened before the supply-side two-way valve 10 is shut off. Without sufficient paint supply, the end of the coating is thinly coated.

If the switching of the supply-side two-way valve 10 is made 100 msec or more earlier than the switching of the return-side two-way valve 11, the operation of shutting off the supply-side two-way valve 10 is too early, and even though the application is completed. Return side two-way valve 11
Is not released, the paint pressure increases until immediately before the end of the application, and the end of the application becomes thick.

In this embodiment, as shown in FIG.
There is no swelling at the application start end, and a coating film having an extremely uniform thickness can be formed from the application start end to the end.

The effect of this embodiment is exactly the same as that of the first embodiment.

(Embodiment 5) Next, the configuration of a coating apparatus according to Embodiment 5 of the present invention will be described.

FIG. 6 is a schematic structural view of a coating apparatus according to a fifth embodiment of the present invention.

The feature of the present embodiment is that, as shown in FIG. 6, a mixer 13 disposed in a flow path 12 between the nozzle 1 for applying the coating The purpose is to apply a pressure loss to the paint 6 supplied from the supply side to the nozzle 1 to form the paint 6 intermittently.

[0110] The other configuration can be the same as that of the first embodiment, and the description is omitted here.

In the present embodiment, it is important that the length L of the mixer 13 in the flow channel 12 be in the range of 1 mm to 200 mm. When the length L is smaller than 1 mm, the pressure loss applied to the mixer 13 is small, and the coating material 6 easily flows to the nozzle 1. Therefore, the coating material is applied under the influence of a sudden pressure rise when the flow direction changes. Then, the coating start end is thickly coated.

When the length L is larger than 200 mm, the pressure loss of the paint 6 applied to the mixer 13 is large, and the paint 6 does not easily flow to the nozzle 1. Therefore, a sufficient amount of paint cannot be supplied, and The starting end is lightly coated.

It is important that the diameter φ of the mixer 13 in the flow channel 12 be in the range of 5 mm or more and 100 mm or less. When the diameter φ is smaller than 5 mm, the pressure loss of the paint 6 applied to the mixer 13 is large, and the paint 6 to the nozzle 1 is difficult to flow. Become.

When the diameter φ is larger than 100 mm,
Since the pressure loss applied to the mixer 13 is small and the coating material 6 flows to the nozzle 1 easily, the coating is applied under the influence of a sudden increase in pressure when the flow direction changes. .

According to the present embodiment, there is no sudden increase in pressure when the flow direction from the return side to the supply side is changed by the intermittent means 100. Therefore, as shown in FIG. In addition, a coating film having an extremely uniform thickness can be formed from the start to the end of the coating.

The effect of this embodiment is exactly the same as that of the first embodiment.

[0117]

According to the present invention, the thickness in the longitudinal direction formed intermittently on the base material can be made uniform, and the thick coating at the start of coating can be suppressed, so that the performance of batteries and capacitors can be improved. It has a great effect on improving product yield.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a coating method according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating a coating method according to a first embodiment of the present invention.

FIG. 3 is a schematic structural view showing a coating method according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram illustrating a coating apparatus according to a third embodiment of the present invention.

FIG. 5 is a schematic configuration diagram illustrating a coating apparatus according to a fourth embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a coating apparatus according to a fifth embodiment of the present invention.

FIG. 7 is a perspective view of a battery electrode plate using a conventional intermittent coating means.

FIG. 8 is a perspective view of a battery electrode plate in the first to fifth embodiments according to the present invention.

FIG. 9 is a diagram showing measurement results of cycle characteristics in the first to fifth embodiments according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 2 Substrate 3 Coating film 4 Roll 5 Drive part 6 Paint 7 Tank 8 Pump 9 Filter 10 Supply-side two-way valve 11 Return-side two-way valve 12 Flow path 13 Mixer 100 Intermittent means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D075 AC02 AC09 AC72 AC84 AC86 AC88 AC99 BB56X CA48 DA03 DB01 DC18 EA05 4F041 AA12 AB01 BA05 CA03 CA13 CA17 CA23 4F042 AA22 CB02 CB08 CB20 CB27

Claims (27)

[Claims] 1. A nozzle for applying a paint on a base material, and intermittent means for repeating supply and stop of the paint to the nozzle and repeating discharge and stop of the paint to a return side. An intermittent coating device, characterized in that at least at the start of coating, the intermittent means starts discharging paint to the nozzle and then stops discharging paint to the return side. . 2. The timing of starting supply of the paint to the nozzle is earlier than the timing of stopping the discharge of the paint to the return side within a range of 5 msec to 500 msec. Intermittent coating device. 3. The timing of starting the supply of the paint to the nozzle is earlier than the timing of stopping the discharge of the paint to the return side within a range of 5 msec to 100 msec. Intermittent coating device. 4. The intermittent application device according to claim 1, wherein the intermittent means operates using a two-way valve or a three-way valve. 5. A nozzle for applying a paint on a base material, and intermittent means for repeating supply and stop of the paint to the nozzle and repeating discharge and stop of the paint to a return side. The intermittent application device, wherein at least at the end of the application, the intermittent means starts the discharge of the paint to the return side after stopping the supply of the paint to the nozzle. 6. The timing of stopping the supply of the paint to the nozzle is earlier than the timing of starting the discharge of the paint to the return side within a range of 0 msec to 100 msec. 5. The intermittent coating device according to 5. 7. A paint pull-back means for sucking the paint in the nozzle and returning the paint to the inside of the nozzle, and wherein the paint pull-back means, when starting the application, paints the paint to the nozzle. The paint is returned to the inside of the nozzle at the same time as the start of the supply, and the paint is sucked from the nozzle at the same time as the stop of the supply of the paint to the nozzle at the end of the application. The intermittent coating device according to any one of the above. 8. An intermittent application device comprising: an intermittent means for intermittently supplying a paint to a nozzle; and a paint retraction means for repeating suction and return of the paint in the nozzle. An operation time A for sucking the paint from inside the nozzle,
An intermittent coating device, wherein the relationship with the operation time B for returning the paint to the inside of the nozzle is A <B. 9. The intermittent coating device according to claim 7, wherein an amount of the paint sucked from the inside of the nozzle is in a range of 0.01 cc to 10 cc. 10. The flow rate of the paint returned to the inside of the nozzle is:
10. The intermittent coating device according to claim 7, wherein the flow rate is 1 cc / msec or more. 11. The operation of the paint withdrawal means is as follows:
2. The method according to claim 1, wherein the step is performed using a piezoelectric element.
0. The intermittent coating device according to any one of 0. 12. An intermittent means for intermittently supplying a paint to a nozzle, and a paint retraction means for repeating suction and return of the paint in the nozzle by up and down movement of a bellow ram provided in the nozzle. An intermittent coating device. 13. The intermittent coating device according to claim 12, wherein an amount of the paint sucked from the inside of the nozzle is in a range of 0.01 cc to 10 cc. 14. A nozzle for applying a paint on a substrate, and the supply and stop of the paint to the nozzle are repeated,
An intermittent coating device including intermittent means for repeating discharge and stop of the paint to a return side, wherein the intermittent means includes a supply-side two-way valve that repeats supply and stop of the paint to the nozzle. A return-side two-way valve that repeats discharge and stop of the paint to the return, and a flow path for the paint, and the supply-side two-way valve and the return-side two-way valve individually control the operation. An intermittent coating device comprising a control means capable of performing the control. 15. At least the return-side two-way valve includes:
It has a configuration to block or open the flow path by movement of the piston, further, the movement direction of the piston at the time of blocking,
The intermittent coating device according to claim 14, wherein the flow of the paint coincides with the flow of the paint. 16. The switching timing of the supply-side two-way valve at least at the start of coating is at least 5 msec to 500 msec from the switching timing of the return-side two-way valve.
The intermittent coating device according to claim 14, wherein the speed is shorter than the range of c or less. 17. The switching timing of the supply-side two-way valve at least at the start of coating is at least 5 msec to 100 msec from the switching timing of the return-side two-way valve.
The intermittent coating device according to claim 14, wherein the speed is shorter than the range of c or less. 18. The intermittent coating device according to claim 14, wherein the amount of the paint sucked from the inside of the nozzle is in a range of 0.01 cc to 10 cc. 19. A nozzle for applying a paint on a substrate, and the supply and stop of the paint to the nozzle are repeated,
An intermittent coating device comprising: intermittent means for repeating discharge and stop of the paint to a return side; and a mixer provided in a flow path between the nozzle and the intermittent means. . 20. The length of the mixer is 1 mm or more and 200 mm or more.
20. The intermittent coating device according to claim 19, wherein the thickness is not more than mm. 21. The diameter of the mixer is 5 mm or more and 100 m or more.
20. The intermittent coating device according to claim 19, wherein m is equal to or less than m. 22. A nozzle for applying a paint on a substrate, and the supply and stop of the paint to the nozzle are repeated,
An intermittent application method for performing intermittent application using an intermittent application device including intermittent means for repeating discharge and stop of the paint to a return side, wherein at least at the start of application, the intermittent means includes the nozzle A method of intermittently applying the paint to the return side after the supply of the paint to the return side is started. 23. A nozzle for applying a paint on a substrate, and the supply and stop of the paint to the nozzle are repeated,
An intermittent application method for performing intermittent application using an intermittent application device including intermittent means for repeating discharge and stoppage of the paint to a return side, wherein at least at the end of the application, the intermittent means includes: An intermittent coating method, wherein after the supply of the paint to the nozzle is stopped, the discharge of the paint to the return side is started. 24. An intermittent application device using an intermittent application device including an intermittent means for intermittently supplying a paint to a nozzle and a paint retraction means for repeating suction and return of the paint in the nozzle. An intermittent coating method for performing coating, wherein an operation time A for sucking the paint from inside the nozzle,
An intermittent coating method, wherein the relationship with the operation time B for returning the paint to the inside of the nozzle is A <B. 25. An intermittent coating method for performing intermittent coating using intermittent means for intermittently supplying a paint to a nozzle, wherein the paint inside the nozzle is sucked by moving up and down a bellofram provided inside the nozzle. And intermittent application method characterized by being able to repeat returning. 26. A nozzle for applying a paint on a substrate, and the supply and stop of the paint to the nozzle are repeated,
An intermittent application method for performing intermittent application using an intermittent application device including intermittent means for repeating discharge and stoppage of the paint to a return side, wherein the intermittent means comprises: A supply-side two-way valve that repeats supply and stop of paint, and a return-side two-way valve that repeats discharge and stop of the paint to return,
An intermittent coating method characterized by individually controlling. 27. A nozzle for applying a paint on a substrate, and the supply and stop of the paint to the nozzle are repeated,
Intermittent means for intermittently using an intermittent application device including an intermittent means for repeating discharge and stop of the paint to the return side, and a mixer provided in a flow path between the nozzle and the intermittent means. An intermittent coating method for performing coating, wherein a pressure loss is caused by the mixer.