JPH1015463A - Coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the coating speed even when a traveling strip is intermittently coated with a viscous material. SOLUTION: A traveling strip S is intermittently coated with a viscous material by this coater 10. In this case, the coater 10 is at least provided with a first discharge means 20 for intermittently discharging the viscous material on the strip S to coat the strip and a second discharge means 30 for applying the viscous material on the strip S between the coated parts 200 formed by the first discharge means 20 to form a coated part 200.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for applying a viscous substance to a moving belt-like object to form a coating section intermittently.

[0002]

2. Description of the Related Art A battery, for example, a battery such as a lithium ion battery, has a positive electrode and a negative electrode. is there. The raw material of this battery is, for example, a copper foil or aluminum foil having a width of 100 mm to 1300 mm and a thickness of 5 to 50 μm, or a sheet of copper or aluminum. On such a sheet or the like, a coating material is intermittently applied to form a coating portion.
About 200 μm. The reason why the coating portion is formed on the sheet is to form an electrode of a battery, and a carbon material, a lithium-containing composite oxide, or the like is used as the coating material. The coating devices used so far are:
It has one application head, and this one application head intermittently applies the paint to the moving belt-shaped sheet. FIG. 8 shows an example of the application unit 2 applied to the sheet 1. The application unit 2 can form the application unit 2 on the sheet 1 by intermittently opening a valve connected to the head.

[0003]

By the way, the valve for supplying the paint to the head is opened to form the coating portion 2 for the sheet 1. When the valve is opened, the coating for the predetermined length is performed. After the part 2 is formed, the valve is turned on at time t1.
When the valve is closed, the supply of the paint cannot be stopped immediately, so that the coating unit 2 is formed with an extra length L1 from the time point t1 when the valve is closed. Moreover, even if the valve is opened again at the time point t2 when the valve is opened again from the state in which the valve is closed, the paint cannot be supplied from the head to the sheet 1 immediately, so that a paint supply delay time T1 occurs. Therefore, from the terminal end 2a of the front coating unit 2 on the sheet 1,
Length L2 of uncoated portion 3 up to start end 2b of next coated portion 2
Is, for example, 20 mm, and the time is 60 ms.

FIG. 9 shows the relationship between the feed speed of the sheet 1, that is, the coating speed, and the control time of the uncoated portion 3 in FIG. 8, and the area enclosed by oblique lines indicates the paint supply delay time T1.
Is shown. The paint supply delay time T1 is determined by characteristics such as the shape of the nozzle. At present, as the application speed of the sheet 1, that is, the feed speed of the sheet 1 is increased, the paint supply delay time T1 from when the paint comes out of the head to reach the sheet 1 becomes longer as shown in FIG. (The control time), and when the application speed of the sheet 1 is further increased, the paint supply delay time T1
Becomes longer than the length of the uncoated portion 3. Therefore, it is not possible to feed the sheet 1 at a high speed and to form the coating portion 2 of a predetermined length on the sheet 1 intermittently. Accordingly, the present invention has been made to solve the above-described problem, and to provide a coating apparatus capable of increasing a coating speed even when a viscous substance is applied intermittently to a moving band-shaped object. It is an object.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a coating apparatus for intermittently applying a viscous substance to a moving strip-shaped object. A first discharge unit for intermittently discharging and applying a viscous substance on the top, and a viscous substance between the application unit formed by intermittently applying the viscous substance on the target object by the first discharge unit. And a second ejection unit for intermittently applying the liquid to the object to form a coating portion.
When intermittently applying a viscous substance to a moving band-shaped object, the first ejection unit intermittently ejects and applies the viscous substance onto the moving object. The second discharging means intermittently discharges and applies a viscous substance to the target between coating parts which the first discharging means discharges and applies to the target intermittently. To form In this way, by intermittently applying the viscous material to at least the first moving means and the second moving means which are moving alternately, the moving speed of the moving object is approximately doubled. Also, the intermittent application of the application section on the object can be stably performed.

[0006]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description. FIG. 1 shows a preferred embodiment of the coating apparatus of the present invention. As shown in FIGS. 2 and 3, the coating apparatus 10 shown in FIG.
This is an apparatus in which 00 and the uncoated portion 500 are alternately formed, that is, the coating portion 200 can be applied intermittently on the sheet S. 1 includes a first discharging unit 20, a second discharging unit 30, a control device 100, and a sheet feeding unit 1.
50 or the like. The sheet feeding means 150 feeds the belt-shaped sheet S from the delivery roll 151 to the take-up roll 152.
Operates the motor M1 in accordance with a command from the control device 100 to feed out the sheet S.
The sheet S can be wound by operating the motor M2 according to the command of 00. This sheet S is a sheet for a raw material of a battery such as a lithium ion battery,
The sheet S has a width of, for example, 100 to 1300 mm and a thickness of 5 to 50 μm. The sheet is made of copper, aluminum, or the like. 2 and 3 for this sheet S.
Is formed, the coating portion 200 is made of a material such as a carbon material or a lithium-containing composite oxide, and the thickness of the coating portion 200 is, for example, 50 to 200 μm. .

The first discharge means 20 shown in FIG. 1 has the following elements. The first ejection means 20 includes the head 3,
A first length detection sensor 18, nip rolls 16, 17,
A roll 4, a valve 12, a paint supply tank 88 and the like are provided. The paint supply tank 88 is connected to the head 3 via a supply pipe 11 and a valve 12. This head 3
Has a nozzle for intermittently applying the paint 88 to the upper surface of the sheet S. A roll 4 is arranged below the head 3 so as to sandwich the sheet S. Nip roll 1
Rolls 6 and 17 sandwich the sheet S. The roll 4 plays a role of a backup roll for making the thickness of the coating constant, and the nip rolls 16 and 17 play a role of a nip roll for running the sheet at a constant speed. The nip roll 16 can send a feed amount pulse PS of the sheet S to the control unit 100 with the rotation of the nip roll 16 by the pulse generator 15. Therefore, the number of pulses of the feed amount pulse PS by the nip roll 16 corresponds to the feed length of the sheet S being fed in the feed direction FS.

Next, the second ejection means 30
Second length detection sensor 19, another sensor 7, valve 1
4, a supply pipe 13 and a paint supply tank 89. The paint supply tank 89 includes a supply pipe 13, a valve 14,
Is connected to the head 5 via a
A nozzle for intermittently applying the application unit 200 to the upper surface of the sheet S is provided.

The sensor 7 detects the coating section 200 formed on the sheet S by the head 3. When the sensor 7 detects the start end of the coating section 200, the retracting means 400 retracts the roll 6 and the head 5 from the sheet S. As a result, the coating unit 200 already formed on the sheet S comes into contact with the head 5 and
Can be prevented from adhering to the nozzle.

The first length detecting sensor 18 detects the length of the application section 200 applied on the sheet S by the head 3. Similarly, the second length detection sensor 19 detects the length of the application section 200 applied on the sheet S by the head 5. The above-described pulse generator 15 sends the feed amount pulse PS to the control device 100. The control device 100 controls the opening / closing operation timing of the valve 12 based on the number of feed amount pulses. Moreover, the sensor 7
When the head 3 detects the beginning of the application section 200 applied on the sheet S, the control section 100 can also control the opening / closing operation timing of the valve 14 by counting the feed amount pulse PS.

FIG. 4 shows an example of the timing of opening and closing the valves 12 and 14 in the coating apparatus 10 of FIG. 1 and an example of a coating section 200 to be formed. In the time chart of FIG. 4, the application speed (feed speed) of the sheet S is, for example, 40 m / min, and the valve 12 changes from the closed state to the open state at time t10, and closes from the open state at time t11. The valve 14 changes from the closed state to the open state at time t12, and changes from the open state to the closed state at time t13.

In FIG. 4, when the valve 12 is opened from the closed state at time t10 in response to a command from the control device 100 in FIG. 1, the head 3 in FIG. 1 is delayed by a predetermined paint supply delay time T1 (for example, 40 ms). Form the coating unit 200 on the sheet S. Then, when the valve 12 is at the time
When closing from the open state in 1, the end 200 b of the coating unit 200 is formed with a predetermined delay. In this way, the first application section 200 is formed from the start end 200a to the end 200b.

On the other hand, at time t12, the valve 14
Open from a closed state. When the valve 14 is opened at time t12, after a predetermined paint supply delay time T1, the next coating unit 20
The starting point 200a of 0 starts and the application unit 200 is formed. When the valve 14 changes from the open state to the closed state at the time t13, with a predetermined delay time,
An end 200b is formed. Thus, the valve 1
When the control unit 100 opens and closes the valve 2 and the valve 14, the coating units 200 and 200 are placed on the sheet S so that the non-coating unit 5
It is formed intermittently at intervals of 00. And the application section 20
The length L5 of the uncoated portion 500 between 0 and 200 is, for example, 20 mm, and the formation time of the uncoated portion 500 is 30.
ms.

FIG. 7 shows an example of the time for the application speed of the sheet S and the length of the uncoated portion. In FIG. 7, the length of the uncoated portion 500 is, for example, 20 mm. In this case, if the coating speed is 20 m / min, the time is 60 ms. Similarly, if the application speed is 30
m / min, the time is 40 ms and the coating speed is 40
m / min, the time is 30 ms, and if the coating speed is 50 m / min, the time is 24 ms, and the coating speed is 6 ms.
At 0 m / min, the time is 20 ms.

Next, an example of a coating operation of the above-described coating apparatus will be described. FIGS. 5 and 6 show an example of a coating operation performed by the coating apparatus 10. In addition, each coating unit 200 is set to 200-1, 200-2} for distinction. In FIG. 5A, when the valve 12 is opened by a command from the control device 100,
Paint is supplied to the head 3 from a paint supply tank 88, and the head 3 is moved by the sheet S in the feed direction FS, so that the coating unit 20 is moved.
0-1 are formed. The pulse generator 15 sends the feed amount pulse PS of the sheet S to the control device 100 by the movement of the sheet S.

The application section 200-1 of FIG.
When passing under the first length detection sensor 18 as in (B), the first length detection sensor 18 outputs a detection signal to the control device 1.
00, the control device 100 controls the feed amount pulse PS while receiving the detection signal from the first length detection sensor 18.
Count. Thereby, the control device 100 can detect the length of the coating section 200-1 based on the detection signal of the first length detection sensor 18 and the feed amount pulse PS. FIG. 5 (A)
As shown in FIG. 5B, when the valve 12 is closed and the supply of the paint from the head 3 to the sheet S is stopped by a command from the control device 100, the formation of the application unit 200-1 is completed. Then, from the first application unit 200-1 to the second application unit 20
The head 3 forms the application section 200-2 such that a space SP having a predetermined length is provided between 0 and 2. The length of the coating unit 200-2 is also detected in the same manner as the coating unit 200-1. While the first length detection sensor 18 detects the space SP, the length of the space SP
0 counts the number of feed amount pulses PS,
Can be detected. Thus, the control device 100
Can obtain the length of the coating unit 200-1, the coating unit 200-2, etc. and the length of the space SP in correspondence with the feed amount pulse PS.

The coating head 3 can perform coating on the upper surface of the sheet S in such a manner that the coating unit 200 is skipped one sheet. Then, based on the lengths of the coating units 200-1 and 200-2 and the length of the space SP obtained by the first length detection sensor 18 by the control device 100, the control device 100
Determines the amount of correction of the length of the coating section 200 and the length of the space SP, and finely adjusts the opening / closing timing of the valve 12,
The length of the coating portion 200 and the length of the space SP at the time of the next formation can be correctly set to predetermined values.

Next, in FIG. 5B, when the sensor 7 detects the start end 200a-1 of the first coating section 200-1, the retraction means 400, 400 in FIG. Retreat from the sheet S. This prevents the application section 200-1 from contacting the nozzles of the head 5. By avoiding the contact, it is possible to prevent the nozzle portion of the head 5 from closing. In addition, the sensor 7 detects the start end 200a-1 of the first coating unit 200-1 and
Since the detection signal is sent to the valve 00, the control device 100 prepares to start switching the valve 14 at that timing.

FIG. 5C shows a state in which the head 5 is retracted from the coating section 200-1 of the sheet S. Then, as shown in FIG. 6A, the next stage head 5 applies the coating material to the upper surface of the sheet S, so that the first coating portion 2
Space S between 00-1 and second application section 200-2
The application unit 200-3 is applied to a predetermined position of P. The timing and the coating length at which the coating of the coating section 200-3 is started can be implemented by the control device 9 opening and closing the valve 14 based on the feed amount pulse PS in FIG.

Then, as shown in FIG.
When −3 approaches the second length detection sensor 19, the second length detection sensor 19 sends a detection signal of the application unit 200-3 to the control device 100. The control device 100 can know the length of the coating section 200-3 by counting the feed amount pulse PS while the second length detection sensor 19 is detecting. Moreover, the uncoated portions 500, 500 between the coating portion 200-3 and the front and rear coating portions 200-1, 200-2.
Can be known by the control device 100 counting the feed amount pulse PS based on the detection signal of the second length detection sensor 19. Based on the length of the uncoated portion 500 and the length of the coating portion 200-3, the control device 100
Can be corrected by finely adjusting the opening / closing timing of the valve 14 by applying feedback so that the length of the uncoated portion 500 and the length of the coated portion 200-3 become predetermined values. In FIG. 6C, the coating unit 200-2 and the coating unit 20
The head 5 forms the application part 200-5 between 0 and 4.

As described above, the first head 3 is moved to the coating sections 200-1, 200-2, 200-4, 200-6.
It is formed on the sheet S intermittently like this,
And the other head 5 is applied to the coating units 200-1 and 200-
2 and a coating unit 200-3 is formed between the coating units 200-2.
The application section 200-5 is formed between the application section 200-4 and the application section 200-4. As a result, the formed coating sections 200-1, 200-3, 200-2, 200-
The uncoated portion 500 can be formed between 5, 200-4,..., And the formed coated portion and the uncoated portion are as shown in FIGS. As described above, the two heads 3 and 5 are arranged at intervals in the flow direction of the sheet S, and the second head forms another coating portion between the coating portions formed by the first head 3. Therefore, the production capacity for forming the intermittent coating section on the sheet is increased about twice. In other words, the reason is that the two heads can alternately apply with a margin.

Incidentally, the coating speed, that is, the feeding speed of the sheet S, is preferably, for example, preferably 10 to 50 m / min. If the coating speed is lower than 10 m / min, it is not preferable because productivity is lowered. Further, it is preferable that the length of the uncoated portion is stably applied between 20 mm and 100 mm. If the length of the uncoated portion is smaller than 20 mm, it is not preferable from the viewpoint of product specifications. If the length of the uncoated portion is longer than 100 mm, it is not preferable from the viewpoint of product specifications.

When the sheet S is fed in the feed direction FS, the control device 100 uses the first length detection sensor 18, the second length detection sensor 19 and the sensor 7 to open and close the valves 12 and 14. , The length of the coated portion and the length of the non-coated portion can be kept within, for example, ± 0.5 mm.

When the sensor 7 shown in FIG. 1 detects the starting end of each coating section 200, the second head 5 and the roll 6 are retracted by the retracting means 400. It is possible to prevent a trouble that the part is attached. When the first length detection sensor 18 and the second length detection sensor 19 detect the length of the application portion and the length of the non-application portion in a non-contact manner and notify the control device 100, the control device 100 Can know the lengths of the coated portion and the uncoated portion by counting the feed amount pulse PS.
The opening / closing timing of 4 can be delicately controlled to make the length of the coated portion and the uncoated portion close to or match a predetermined value. In the above-described embodiment, an example is described in which the paint is applied to the sheet for the original battery of the battery. The reason why the paint is intermittently applied in this manner is as follows. In other words, attach the lead wire to the uncoated part,
This is because cutting is performed for each electrode sheet having a set of patterns of an applied portion and an uncoated portion. Then, this electrode sheet is further divided into several small pieces, and a thin electrode sheet having an uncoated portion, an electrode, and a coated portion is formed. This thin electrode sheet is used as a positive electrode or a negative electrode of a lithium ion battery. The present invention
The present invention is not limited to this, and can also be used when a viscous substance other than paint is intermittently attached to an object on a sheet moving in another field. Further, the illustrated embodiment of the present invention has a first discharging unit and a second discharging unit,
You may make it comprise the 1st-3rd discharge means or more.
It should be noted that a device such as a cam mechanism or a cylinder can be used as the retracting means 400.

[0025]

As described above, according to the present invention,
Even when a viscous material is applied intermittently to a moving belt-like target, the application speed can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a coating apparatus according to the present invention.

FIG. 2 is a diagram illustrating an example of an applied portion and an uncoated portion formed on a sheet of the application device of FIG. 1;

FIG. 3 is a side view showing the sheet of FIG. 2, an applied portion, and an uncoated portion.

FIG. 4 is a diagram showing an example of the opening and closing timing of two valves and an example of an applied portion and an uncoated portion in the present invention.

FIG. 5 is a diagram showing a state in which a coating unit is formed by a first discharging unit and a second discharging unit.

FIG. 6 is a diagram showing a state in which an applied portion and an uncoated portion are formed by a first discharging unit and a second discharging unit.

FIG. 7 is a diagram illustrating an example of a coating speed and a time of an uncoated portion.

FIG. 8 is a view showing an example of forming a coating section in a conventional coating apparatus with opening and closing of a valve.

9 is a diagram showing an example of a paint supply delay time in the conventional example of FIG.

[Explanation of symbols]

S: sheet (object), 3, 5: head, 7.
..Sensor, 10 ... Coating device, 12, 14 ... Valve, 18 ... First length detection sensor, 19 ... Second length detection sensor, 20 ... First Discharge means, 30
... Second ejection means, 100 ... Control device, 200
... Coating part, 400 ... Evacuation means, 500 ... Uncoated part

Claims (6)

[Claims] A coating apparatus for intermittently applying a viscous substance to a moving band-shaped object, wherein the application apparatus intermittently discharges and applies the viscous substance onto the moving object. Forming a coating section by intermittently applying the viscous material to the object between the first discharge means and the application section formed by applying the viscous substance intermittently to the object by the first discharge means; And a second discharging means for the application. 2. An application unit applied by the first ejection unit to prevent an element of the second ejection unit from contacting an application unit applied by the first ejection unit. 2. The coating apparatus according to claim 1, further comprising: a sensor configured to detect the application portion applied by the first discharge unit by the sensor; and a retraction unit configured to retreat an element of the second discharge unit from the target when the application unit is detected by the sensor. . 3. The coating apparatus according to claim 1, wherein the elements of the second discharge unit include a coating head of the second discharge unit and a roll for feeding an object. 4. An uncoated portion is formed between an application portion applied by the first ejection device and an application portion applied by the second ejection device, and the object is a battery. The coating device according to claim 1, which is a metal foil sheet. 5. The first discharging means includes a first length detecting sensor for detecting a coating length of a coating portion applied to the object by the first discharging means, and the second discharging means includes: A second length detection sensor for detecting the application length of the application portion applied to the target object by the second ejection means and the length of the non-application portion, wherein the length detection signal from the first length detection sensor is provided. Based on the length detection signal from the second length detection sensor, the next application time of the second application unit is adjusted based on the length detection signal from the second length detection sensor. The coating device according to claim 4, further comprising: a controller configured to adjust a coating length of the coating unit to a predetermined length. 6. The control device according to claim 1, wherein each of the output pulse from the movement amount measuring means for measuring the movement amount of the object, a detection signal from the first length detection sensor, and a detection signal from the second length detection sensor. The coating device according to claim 5, wherein the length of the coated portion and the length of the uncoated portion are measured.