JP2001149840A - Coating method and coating device - Google Patents

Abstract

[PROBLEMS] To provide a coating method and a coating apparatus which can quickly perform an operation of applying a coating liquid intermittently on a base material and can form electrodes with good productivity. To provide. SOLUTION: A moving substrate 1 is provided with a shutter 9.
In a coating method of alternately forming a coated portion 15 to which the coating liquid 8 is applied by opening and closing and an uncoated portion 16 to which the coating liquid 8 is not applied, the traveling speed Vm of the base material 1 is measured.
From the traveling speed Vm and the length of the coated portion 15 or the uncoated portion 16, a region forming time Tc required to form the coated portion 15 or the uncoated portion 16 is calculated, Based on the opening / closing speed Vs of the shutter 9, a movement time Tm required to reach the position to which the shutter 9 is to be moved is calculated, and the movement time Tm is compared with the area forming time Tc. Is larger than the region forming time Tc, the moving amount of the shutter 9 is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and a coating apparatus for intermittently applying a coating liquid to a substrate.

[0002]

2. Description of the Related Art Generally, in a non-aqueous electrolyte battery, the electric conductivity of a non-aqueous electrolyte used is lower than that of an aqueous electrolyte battery. It is necessary to lower the internal resistance. Therefore, in order to increase the electrode active material filling amount in the cylindrical battery and the prismatic battery of the non-aqueous electrolyte battery, a spiral structure in which a sheet-like electrode is wound or a laminated structure in which a sheet-like electrode is stacked is adopted. I have. FIG. 8 shows a structure of a general lithium ion secondary battery as a nonaqueous electrolyte battery. In this battery, an anode plate 130 in which an electrode mixture mainly composed of lithium cobalt oxide serving as an electrolytic active material is applied to a surface of an aluminum foil serving as a conductive support with a predetermined thickness, The cathode plate 131 coated with the electrode mixture described above is wound in a laminated state via a separator 132 made of an insulator.

An anode lead 133 made of aluminum is joined to the inner end of the anode plate 130,
The anode lead 133 is joined to the battery cover 134. A cathode lead 135 made of nickel is joined to an outer peripheral portion of the cathode plate 131, and the cathode lead 135 is connected to a bottom surface of the battery can 136. Incidentally, when such an anode plate 130 is manufactured, the anode plate 130 is manufactured continuously in a long strip shape, cut into a predetermined length, and the individual anode plates 130 are manufactured. In the anode plate 130, it is necessary to bond the anode lead 133 to the inner end as described above. When the anode plate 130 is to be continuously manufactured in a long strip shape as described above, the coating using the electrode mixture is applied. In order to join the portion and the anode lead 133, it is necessary to sequentially form an uncoated portion where no electrode mixture is applied.

[0004] On the other hand, the same applies to the cathode plate 131. In the case of manufacturing the cathode plate 131, the cathode plate 131 is manufactured continuously in a long strip shape, and cut into predetermined lengths to manufacture the individual cathode plates 131. I have to. The cathode lead 131 also needs to be joined to the outer peripheral portion of the cathode plate 131 as described above, and when the cathode plate 131 is manufactured continuously in a long strip shape as described above, the cathode lead 131 and the coated portion coated with the electrode mixture are used. Cathode lead 135
It is necessary to sequentially form an uncoated portion where the electrode mixture is not applied to connect the electrodes.

Therefore, the anode plate 130 and the cathode plate 13
As a method of manufacturing 1, a mask is applied in advance to a portion that is to be an uncoated portion of a base material that is a long current collector and is a conductive support, and while this is running, A method of alternately forming a coated part and an uncoated part by performing coating.After coating the entire area on the long base material, the part to be the uncoated part is scraped off and coated. There is a method of alternately forming a portion and an uncoated portion.

[0006] As described above, as a first method, a method of applying masking in advance or shaving off a portion to be uncoated after coating is disclosed in Japanese Patent Application Laid-Open No. 4-28.
JP-A-63-114058 and JP-A-3-439 disclose a method in which a coating liquid containing an electrode active material is extruded on both sides of a substrate as described in JP-A No.
Japanese Patent Application Laid-Open Nos. 1-267953 and 1-19 disclose a lifting method as disclosed in JP-A-58-58, and a third method.
A lowering system as disclosed in Japanese Patent No. 4265 has been proposed.

[0007] In the above-mentioned coating method, as a fourth method, a plurality of rotating rolls are combined, and a coating solution containing an electrode active material passes through the roll gap, so that the inside of the roll gap is reduced. There is also a roll coating method in which coating is performed on a traveling base material. Examples of such a roll coating method include a three-roll reverse roll method, a reverse gravure method, and a direct gravure method.

[0008] Further, as the above-mentioned coating method,
As a fifth method, Japanese Patent Application Laid-Open Nos. 1-184069, 1-194265, and 4-242207
A doctor blade is arranged with an appropriate gap to a base material as shown in Japanese Patent Application Laid-Open Publication No. H10-209, and a coating liquid containing an electrode active material is stored in front of the doctor blade, and an appropriate amount of an electrode mixture liquid is applied to the running base material. There is also a method in which a base material is coated by being drawn out in a layer form. As a coating method as described above, a sixth method is disclosed in
Japanese Patent Application Laid-Open No. 5816 discloses a method of coating a substrate using an extrusion die.

[0009] On the other hand, unlike the method of masking in advance or removing unnecessary parts after coating as described above, a method of sequentially forming an uncoated part and a coated part from the time of coating has also been proposed. ing. As such a coating method, as a seventh method, a coating portion combining a doctor blade and a shutter having a coating stagnation portion as disclosed in Japanese Patent Application Laid-Open No. 1-184069 is applied to a running base material. Has been proposed. In this method, the coating thickness is adjusted by changing the gap between the fixed doctor blade and the moving base material, and the shutter that has a coating liquid retaining section for supplying the coating liquid to the doctor blade is opened and closed. By doing so, a coated portion and an uncoated portion are alternately formed.

[0010]

However, the above-mentioned coating method has the following problems. In the first, second, and third methods, since both surfaces can be coated simultaneously, the efficiency is high. However, it is difficult to position the base material at the center of both electrode mixture coating solutions, and a thin electrode plate having a uniform thickness is used. Difficult to manufacture. Further, in the fourth method,
For the desired electrode thickness, ripping (ridge phenomenon) based on the relationship between the viscoelastic behavior and surface tension of the coating liquid that is an appropriate electrode mixture
A coating film defect called “coating defect” easily occurs. In addition, application and leveling of the coating liquid between the coating rolls, and scattering of the coating liquid when the coating liquid is transferred and instability of the viscoelastic behavior due to drying occur. Further, it is difficult to maintain stable coating for a long time due to a change in volatile components in the coating liquid due to exposure of the coating liquid to the atmosphere in the return circulation supply path of the coating liquid.

Further, in the fifth method, the coating is simple and the battery electrode can be obtained very efficiently. However, when the coating is stopped, it is necessary to wait until the coating liquid stored in the doctor blade runs out. There is a problem that must be. Further, in the sixth method, by controlling the supply pressure of the coating liquid to be supplied to the extrusion die, it is possible to stop the coating at an arbitrary place which is impossible in the above-described fifth method. Become. However, in this method, the coating state is strongly influenced by the viscoelastic behavior of the coating liquid, and particularly when a coating liquid containing a large amount of solids is used, the kinematic viscosity becomes extremely high. There is a problem that the working speed cannot be obtained.

In each of the above-described first to sixth methods, in order to form an uncoated portion on the electrode plate, masking is performed on the base material in advance, or an uncoated portion is formed after coating. Work such as shaving off the parts is required, which causes considerable trouble in the battery electrode manufacturing process and waste of removing a part of the raw materials.

On the other hand, in a seventh method of disposing a coating section, which is a combination of a doctor blade and a shutter having a coating liquid retaining section, on a running substrate, the substrate is previously masked or coated. There is no need to scrape off the coating liquid at the locations that will be uncoated after processing. Further, in the production of various types of battery electrodes, there is little change in the manufacturing apparatus main body, and a desired battery electrode can be obtained with extremely high efficiency.

In the seventh method, as the coating speed increases,
The opening and closing time of the shutter is shortened, and when the shortened time exceeds a certain area, it is necessary to restart the operation before the shutter is completely opened (or before it is closed). At that time, the load applied to the motor that drives the shutter changes significantly more than when the motor is driven from a completely open state (or a closed state), and thus the operating time and operating position of the shutter are changed. Therefore, in a coating apparatus in which the coating length is determined by the operation time of the shutter and the free fall of the coating liquid, the fluctuation causes deterioration in dimensional accuracy and coating unevenness at the start of intermittent coating, and the coating speed cannot be increased. Cause.

Accordingly, the present invention has solved the above-mentioned problems, and has made it possible to quickly perform an operation of applying a coating liquid on a substrate with an intermittent portion, thereby enabling an electrode to be formed with good productivity. It is an object of the present invention to provide a coating method and a coating apparatus.

[0016]

According to the first aspect of the present invention, there is provided a moving part in which a coating liquid is applied to a running base material by opening and closing a shutter, and the coating liquid is not applied. In a coating method in which an uncoated portion is formed alternately, the traveling speed of the base material is measured, and based on the traveling speed and the length of the coated portion or the uncoated portion, the coated portion or the uncoated portion is measured. Calculate the area formation time required to form the engineering portion, based on the opening and closing speed of the shutter,
Calculate the movement time required to the position to which the shutter should move, compare the movement time with the region formation time, and when the movement time is longer than the region formation time, This is achieved by a coating method that corrects the amount of movement.

According to the first aspect of the present invention, when the shutter is opened, the coating liquid is applied to the substrate to form a coating portion, and when the shutter is closed, the coating liquid is not supplied to the substrate. An uncoated portion is formed on the substrate. Then, by opening and closing the shutter, a coated portion and an uncoated portion are alternately formed. Here, the running speed of the base material is calculated based on the moving amount of the running base material. Then, the region forming time required to form the length of the coated portion or the uncoated portion is determined from the traveling speed. Thereafter, a movement time required to reach a position where the shutter should move is calculated based on the opening / closing speed of the shutter and the position of the shutter.

Therefore, the region forming time and the moving time are compared, and when the moving time is longer than the region forming time, the moving amount of the shutter to be moved is corrected. That is,
When the moving time is longer than the area forming time, it indicates that the next operation is performed before the shutter is positioned at a certain position. Therefore, by correcting the displacement of the position information, control is performed so that the movement amount is correct.

According to a second aspect of the present invention, there is provided a doctor blade having a first concave portion, and a shutter having a second concave portion which is disposed to face the doctor blade and is bent toward the doctor blade. Having a coating liquid in the first concave portion and the second concave portion,
In a coating device that alternately forms a coating portion that applies a coating liquid to a substrate that travels by opening and closing a shutter and an uncoated portion that does not apply a coating liquid, a shutter driving unit for opening and closing the shutter. A shutter opening / closing mechanism having a position detecting unit for detecting a state of the shutter driving unit to detect position information of the shutter, and detecting a moving amount of the traveling base material and outputting a moving amount detection signal. The traveling speed of the base material is measured from the traveling distance detection signal, and the traveling speed and the length of the coated portion or the uncoated portion are used to calculate the coating speed. The area formation time required to form the portion or the uncoated portion is calculated, and it is necessary to reach the position where the shutter should be moved based on the position detection signal from the position detection section. It calculates the Do travel time, the case where the travel time than the region forming time is greater, by a coating apparatus and a control unit having a function of correcting the positional information the shutter to be moved is achieved.

According to the second aspect of the present invention, when the shutter is opened by the shutter driving unit, the coating liquid is applied on the base material to form a coating portion. On the other hand, when the shutter is closed, the coating liquid is not supplied onto the base material, and an uncoated portion is formed. In this way, a coated portion and an uncoated portion are alternately formed on the substrate. At this time, the substrate movement amount detection unit detects the movement amount of the substrate and sends a movement amount detection signal to the control unit. Then, the control unit calculates the traveling speed of the base material based on the movement amount detection signal. On the other hand, the position detector detects the position of the shutter driver and sends a position detection signal to the controller.

Then, the controller calculates the area forming time of the coated or uncoated portion from the running speed and the length of the coated or uncoated portion to be formed. Further, the control unit calculates, from the position detection signal, a moving time required for a position to be moved next to the shutter. And the control unit
The movement time is compared with the region formation time. If the movement time is longer than the region formation time, the position command signal output to the motor is corrected. That is, when the moving time is longer than the region forming time, the shutter does not move to the predetermined position until the coated portion or the uncoated portion is formed. Therefore, the next time the shutter is moved, it must be smaller than the predetermined amount of movement. Therefore, the control unit adjusts the position of the shutter by correcting the position command signal, so that the supply amount of the coating liquid is adjusted.

[0022]

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 is a block diagram showing a preferred embodiment of a coating apparatus according to the present invention. Referring to FIG.
0 will be described. 1 includes an unwinding shaft 2, a drying unit 5, a winding shaft 7, a coating unit 11, and the like. The unwinding shaft 2 winds and accommodates the substrate 1, and the substrate 1 is made of, for example, a stretched aluminum foil. The unwinding shaft 2 is connected to a rotation drive source 2a such as an AC servomotor, for example,
And feeds the substrate 1 to the winding shaft 7 at a constant tension and speed without loosening.

Guide rolls 17a, 17b, 17c, and 17d are disposed between the unwinding shaft 2 and the main roll 3, and the guide rolls 17a to 17d squeeze the substrate 1 at a predetermined tension. And has a function of leading the main roll 3 from the main roll. The main roll 3 is a portion serving as a base when the coating liquid 8 is applied to the base material 1, and is arranged rotatably in the direction of arrow R2. Further, a rubber roll 4 is disposed on the outer peripheral surface side of the main roll 3 in order to prevent the substrate 1 and the main roll 3 from slipping. Then, the main roll 3 and the rubber roll 4 are fed in the direction of arrow M1 while sandwiching the substrate 1. Also, as shown in FIG.
The main roll 3 is connected to a substrate movement amount detection unit 50 composed of, for example, a pulse generator. The substrate movement amount detection unit 50 detects the movement amount of the substrate 1 and outputs a movement amount detection signal S3 to the control unit. 21 is provided.

On the upper side of the main roll 3 in FIG.
The coating unit 11 is for applying the coating liquid 8 to the substrate 1. A drying unit 5 is disposed between the coating unit 11 and the winding shaft 7.
This is for volatilizing the solvent component of the coating liquid 8 applied by the above. The winding shaft 7 is for winding the substrate 1 on which the coating liquid 8 has been applied, and is arranged so as to be rotatable in the direction of the arrow R1 by a rotation drive source 7a. Further, between the drying unit 5 and the winding shaft 7, guide rolls 17e and 17f and an outfield roll 6 for running the base material 1 while applying a predetermined tension are arranged.

FIGS. 2 and 3 are structural views showing an example of a shutter opening / closing mechanism in the coating apparatus according to the present invention. The coating section 11 will be described with reference to FIGS. 2 and 3. FIG. The shutter opening / closing mechanism 20 in FIG. 2 includes a shutter driving unit 22, a position detecting unit 53, and the like.
Has a motor 51 composed of, for example, an AC servomotor and a cam mechanism 52. A cam mechanism 52 is connected to the rotating shaft of the motor 51 shown in FIG. 3, and when the motor 51 rotates, the cam mechanism 52 rotates in synchronization with this. Also,
The cam mechanism 52 is, for example, a
When the cam mechanism 52 rotates, the shutter 9 moves in the direction of the arrow X and opens and closes.

The motor 51 shown in FIG. 2 operates based on a position command signal S2 from the control unit 21, and rotates the cam mechanism 52 to an angle indicated by the position command signal S2. Further, the motor 51 has a built-in position detecting section 53 composed of, for example, a pulse generator. The position detection unit 53 detects the position angle L2 of the motor 51, and
1 has a function of sending a position detection signal S1 to the position detection signal S1. The position detection signal S1 includes the position angle L2 of the motor 51 (cam mechanism 52), and the control unit 21 detects the position of the shutter 9 based on the position detection signal S1.

The control section 21 is composed of, for example, a high-speed servo controller and a servo pack, and controls the operation of the motor 51 by a position command signal S2 output from the high-speed servo controller. Further, the control unit 21 has a function of calculating the traveling speed Vm of the base material 1 using the movement amount detection signal S3 sent from the base material movement amount detection unit 50. The control unit 21 has a function of correcting the position command signal S2 based on the traveling speed Vm and the position detection signal S1 sent from the position detection unit 53, as described later.

When the position command signal S2 is sent from the control unit 21 in FIG. 2, the motor 51 is driven to rotate to the angle indicated by the position command signal S2. Then, the cam mechanism 52 rotates in the direction of the arrow R3 in synchronization with the rotation of the motor 51. Then, the shutter 9 connected to the cam mechanism 52 has an arrow X
, The shutter 9 is opened and closed. At this time, the position detection unit 53 sends the position angle L2 of the motor 51 to the control unit 21 as the position detection signal S1. Thereby, the control unit 21 can grasp the position of the shutter 9. Here, the motor 51 and the cam mechanism 52 shown in FIG.
For example, the angle when the shutter 9 is completely closed is 0 (°), and the maximum angle when the shutter 9 is fully opened is 180 (°).
It is set to be.

FIG. 4 is a block diagram showing an example of a coating unit in the coating apparatus according to the present invention. Referring to FIG.
Will be described. The coating unit 11 in FIG.
The shutter 9 and the doctor blade 10 are arranged so as to face each other. The doctor blade 10 is a member that is bent toward the shutter 9 and has a substantially U-shaped cross section in which the first concave portion 12 is formed. The doctor blade 10 is formed such that its thickness decreases toward the substrate 1 side.

The shutter 9 is housed in the first recess 12 of the doctor blade 10 and
The second concave portion 13 bent to the 0 side is formed. FIG.
As shown in FIG.
, And has a shape that allows contact with the doctor blade 10 such that the tip of the doctor blade 10 is slightly left. Here, since the tip portions of the shutter 9 and the doctor blade 10 are tapered, the coating liquid retaining portion 14 is also tapered. Also, the first recess 1
The second and second recesses 13 form a coating liquid retaining portion 14, and the coating liquid 8 is stored in the coating liquid storage portion 14. The coating liquid 8 is made of an electrode mixture mainly composed of, for example, lithium cobalt oxide as an electrolytic active material.

When the shutter 9 in FIG. 5 moves in the direction of arrow X1, an opening 18 is formed at the tip of the shutter 9 and the doctor blade 10. And this opening 18
The coating liquid 8 is applied to the base material 1 along the tip of the doctor blade 10. At this time, the coating liquid 8 is applied to the substrate 1 by free fall, and the amount of the coating liquid 8 applied depends on the size of the opening 18, that is, the amount of movement of the shutter 9. On the other hand, when the shutter 9 moves in the direction of the arrow X2 and comes into contact with the doctor blade 10, the opening 18 is closed, and the coating liquid 8 is not applied to the substrate 1. Note that even if the shutter 9 is not completely closed,
The uncoated portion 16 can be formed without the coating liquid 8 being supplied to the base material 1 due to the surface tension, viscosity, or the like.

Next, an example of the operation of the coating apparatus will be described with reference to FIGS. First, the unwinding shaft 2 and the winding shaft 7 in FIG. 1 rotate, and the substrate 1 is fed in the direction of the arrow M1. At this time, the substrate movement amount detection unit 50 in FIG. 2 detects the amount of rotation of the main roll 3 and a movement amount detection signal S3 is sent to the control unit 21. Here, the output movement amount detection signal S3 is, for example, a signal of 0.1 (mm / pulse). Then, the control unit 21 outputs the movement amount detection signal S3
The traveling speed Vm of the base material 1 is calculated based on.

Next, the position command signal S of the control unit 21 shown in FIG.
When the motor 51 is driven by 2, the shutter 9 moves in the arrow X1 direction. Then, an opening 18 is formed between the shutter 9 and the doctor blade 10 in FIG. 5, and the coating liquid 8 is applied to the substrate 1 from the opening 18. Thus, the application portion 15 is formed on the base material 1. Then, the control unit 21 in FIG. 2 calculates a region forming time Tc for forming the coating portion 15 from the traveling speed Vm and the predetermined length of the coating portion 15. This region formation time T
When c has elapsed, the position command signal S2 is output from the control unit 21 to the motor 51, and the shutter 9 is closed. Then, the coating liquid 8 is not output from the coating unit 11 and the uncoated portion 1 is not output.
6 are formed.

Thereafter, the control unit 21 shown in FIG.
The area forming time Tc for forming the uncoated portion 16 is determined from the length Lf of the uncoated portion 16 which is predetermined as m.
Is calculated. When the region forming time Tc has elapsed, the shutter 9 is opened by the position command signal S2 of the control unit 21.
By repeating the opening and closing of the shutter 9, the coated portions 15 and the uncoated portions 16 are alternately formed on the substrate 1. Then, the substrate 1 to which the coating liquid 8 has been applied is sent to the drying unit 5 in FIG. 1, and the solvent component contained in the coating liquid 8 is volatilized. Then, the substrate 1 is wound around the winding shaft 7 via the guide rolls 17 e and 17 f and the outfield roll 6.

As described above, since the coated portion 15 and the uncoated portion 16 are formed by opening and closing the shutter 9, when the traveling speed Vm of the substrate 1 is increased, the coated portion 15 becomes uneven. May cause inconvenience. In particular,
If the traveling speed Vm of the base material 1 is increased, the opening / closing speed Vs of the shutter 9 cannot catch up, and the shutter 9 needs to be opened before the shutter 9 is completely closed. The shutter 9 at this time is the shutter driving unit 2
Since the load applied to 0 significantly changes from a state where the shutter 9 is completely in a normal pair, the moving time Tm of the shutter 9 changes. Naturally, since the coating apparatus 10 determines the length of the coating portion 15 by the movement time Tm of the shutter and the supply of the coating liquid 8 due to the falling of the coating liquid under its own weight, the fluctuation is caused by the length of the coating section. Have a big impact.

For example, when an operation of opening to a predetermined position is performed before the shutter 9 is completely closed, the shutter 9 is opened more than a desired position. Substrate 1
Is applied by free fall of the coating liquid 8, the degree of opening and closing of the shutter 9 greatly affects the coating amount. Therefore, the control of the opening and closing operation of the shutter is performed as follows.

FIG. 6 is a flow chart showing a preferred embodiment of the coating method of the present invention. The coating method, particularly the operation control of the shutter 9, will be mainly described with reference to FIG. In the case where the electrode of the battery according to the above embodiment is applied, the uncoated portion 16 is more than the coated portion 15.
Since the length is shorter, an error often occurs in the opening / closing position of the shutter 9 when the uncoated portion 16 is formed. Therefore, in FIG. 6, operation control when the shutter 9 is opened from the state in which the shutter 9 is closed will be described.

First, in ST1 of FIG. 6, the movement amount of the base material 1 is sent from the base material movement amount detection unit 50 of FIG. 2 to the control unit 21 as a movement amount detection signal S2. The traveling speed Vm of the substrate 1 based on the detection signal S2
Is calculated. Further, the shutter 9 is opened, and the motor 51 is positioned at a predetermined position angle L2. The position angle L2 is detected by the control unit 21 as the position detection signal S1 from the position detection unit 52. For example, when the shutter 9 is half opened, the position angle L2 of the motor is 90 (°).

Next, in ST2, the control unit 21 determines the region forming time Tc (= Lf / Vm) for forming the uncoated portion 16 based on the traveling speed Vm and the length Lf of the uncoated portion 16.
Is calculated. In ST3, the control unit 21 calculates a predetermined moving time Ts until the shutter 9 is completely closed from the predetermined position angle L2 (L2 = 0 (°)). Here, when the shutter 9 is completely opened (L
1 = 180 (°)) to a completely closed state (L2 = 0)
(°)) is measured in advance. Therefore, the opening / closing speed Vs of the shutter 9 is Tm
/ L1, and the movement time Tm (= Tm / L1 × L2) from the position angle L2 of the motor 51 to the completely closed state is calculated. Then, in ST4, it is determined whether or not the movement time Tm is longer than the region formation time Tc (Tm).
> Tc). Specifically, the following equation (1) is obtained. Ts × L2 / L1> Lf / Vm Equation (1)

According to the equation (1), the position command signal S2 which the control unit 21 sends to the motor 51 to open the shutter 9
It is determined whether or not correction is to be made. That is, the control unit 2
1 judges whether or not the shutter 9 can be completely closed while forming the uncoated portion 16. Even before the shutter 9 is completely closed, if the uncoated portion 16 has finished traveling, the control unit 21 must output the position command signal S2 to the motor 51 so as to open the shutter 9. No. This is because, although the shutter 9 is not completely closed, if the shutter 9 is further controlled to move to the predetermined position angle L2, a phenomenon occurs that the shutter 9 is excessively opened. is there.

When the formula (1) does not hold, the control section 21 corrects the position command signal S2 to adjust the amount of movement of the shutter 9 in ST5 after the lapse of the region forming time Tc. Send to motor 51. Here, FIG. 7 is a graph showing the relationship between the motor position command signal S2 and the correction value, and the correction method will be specifically described with reference to FIG. In FIG. 7, the position command signal S
When the position angle L2 of No. 2 is, for example, 120 (°), the control unit 21 multiplies the position command signal S2 by a correction coefficient = 0.85 and sends the calculation result to the motor 51 as the position command signal S2. Then, the motor 51 rotates based on the corrected position command signal S2, and the shutter 9 moves in the direction of the arrow X1. Thereby, the shutter 9 does not open too much, and the coating state of the coating portion 15 can be improved.

For example, the length Lf = 2 of the uncoated portion 16
0 (mm), maximum position movement time Ts = 0.01 (second),
Position angle L2 = 90 (°), running speed 50 (mm / sec)
From the equation (1), 0.01 × 180/90> 20/500 0.02> 0.04 In this case, the region forming time Tc of the uncoated portion 16 becomes longer than the moving time Tm, The next opening operation is performed in a state where the shutter 9 is not completely closed. Accordingly, the amount of movement of the shutter 9 is adjusted by correcting the position command signal S2 sent to the motor 51 based on the graph shown in FIG. On the other hand, when equation (1) holds,
In ST7, the control section 21 sends the position command signal S2 to the motor 51 without correction.

According to the above-described embodiment, by changing the operating parameters for opening and closing the shutter 9 depending on the traveling speed Vm and the coating conditions, the followability to the speed command is made constant at the traveling speed Vm, and the precision of the precision dimension is improved. Can be improved. That is, even if the traveling speed Vm is improved by increasing the speed of the substrate 1 and the opening / closing movement distance of the shutter 9 changes, the followability to the position command is common to the low-speed range, so that the final movement position does not change. This enables stable production without affecting the coating length and quality in the high-speed range.

Specifically, it is calculated in advance whether or not the opening / closing operation of the shutter 9 can follow the traveling speed Vm of the base material 1, and the amount of movement of the shutter is controlled based on the calculation result. Thereby, the movement amount of the shutter 9 can be automatically adjusted. Therefore, even if the traveling speed Vm becomes high, the deterioration of the coating state can be prevented by opening the shutter 9 too much, and the coated portion 15 and the uncoated portion 16 can be formed with high accuracy. . Therefore, the production efficiency can be improved by increasing the traveling speed Vm.

The embodiment of the present invention is not limited to the above embodiment. In the above-described embodiment, the electrode formation of the battery has been described as an example, but the present invention can be applied to an apparatus for applying an adhesive or other fluid. In FIG. 5, the rotation amount of the motor 51 is corrected based on the uncoated portion, but the rotation amount of the motor 51 may be controlled based on the coated portion. Also, the position angle L2
FIG. 7 is a graph of FIG. 6 serving as a reference for correcting
The relationship between the position angle L2 and the correction coefficient depends on the type of motor,
It differs depending on the configuration of the entire coating apparatus 10 and the like.
It is not limited to the graph shown in FIG.

[0047]

As described above, according to the present invention,
It is possible to provide a coating method and a coating apparatus that can quickly perform an operation of intermittently applying a coating liquid on a base material and can form an electrode with good productivity.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a preferred embodiment of a coating apparatus of the present invention.

FIG. 2 is a configuration diagram showing an example of a shutter opening / closing mechanism in the coating apparatus of the present invention.

FIG. 3 is a configuration diagram illustrating an example of a shutter driving unit in the coating apparatus of the present invention.

FIG. 4 is a schematic perspective view showing an example of a coating unit in the coating apparatus of the present invention.

FIG. 5 is a schematic view showing a portion around an opening in the coating apparatus of the present invention.

FIG. 6 is a flowchart showing a preferred embodiment of the coating method of the present invention.

FIG. 7 is a graph showing the relationship between a position command signal and a correction coefficient used when correcting a position command signal in the coating method of the present invention.

FIG. 8 is a schematic perspective view showing an example of a general nonaqueous electrolyte battery.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate, 2 ... Unwinding shaft, 3 ... Main roll, 5 ... Simple production, 6 ... Outfield roll, 7 ... Winding shaft, 8 ... Coating liquid, 9 shutter, 10 doctor blade, 11 coating part, 15 coating part, 16 uncoated part, 18
... Opening, 20 ... Shutter opening / closing mechanism, 21
..Control unit, 22 ... Shutter drive unit, 50 ...
Moving amount detection unit, 51: motor, 52: cam mechanism, 53: position detection unit, 100: coating device, L
f: length of the uncoated portion, Tc: region forming time,
Tm: moving time, Vs: shutter opening / closing speed.

Claims (2)

[Claims] 1. A coating method for alternately forming a coated portion to which a coating liquid is applied by opening and closing a shutter and an uncoated portion to which the coating liquid is not applied to a traveling base material, Measure the traveling speed, from the traveling speed and the length of the coated portion or uncoated portion, to calculate the area forming time required to form the coated portion or the uncoated portion, Based on the opening / closing speed of the shutter, a movement time required to reach a position where the shutter should move is calculated, and the movement time is compared with the region formation time, and the movement time is calculated based on the region formation time. The application amount of the shutter is corrected when the distance is also large. 2. A doctor blade having a first recess,
A shutter having a second concave portion which is disposed to face the doctor blade and is bent toward the doctor blade, wherein a coating liquid is contained in the first concave portion and the second concave portion; In a coating device that alternately forms a coating portion that applies a coating liquid to a substrate that travels by opening and closing and an uncoated portion that does not apply a coating liquid, a shutter driving unit for opening and closing the shutter, A shutter opening / closing mechanism having a position detecting unit for detecting a state of the shutter driving unit for detecting position information of the shutter; and detecting a moving amount of the traveling base material and outputting a moving amount detection signal. For the substrate movement amount detection unit for, measuring the traveling speed of the substrate from the movement amount detection signal, from the traveling speed and the length of the coated portion or the uncoated portion, Calculate the area forming time required to form the worked part or the uncoated part, and calculate the moving time required to move the shutter based on the position detection signal from the position detecting unit. And a control unit having a function of correcting position information to be moved by the shutter when the movement time is longer than the region formation time.