JPH09117706A - Coating die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and inexpensively form a discontinuous coating layer of desired coating pattern respectively on both side faces of a base material and to improve the quality and thickness precision of the coating layer. SOLUTION: A couple of die elements 3 are provided with a coating agent feed passage 4 and a passage 5 for sucking the agent discharged from the passage 4. Consequently, the elements 3 are independently and repeatedly reciprocated with respect to a base material 2 after the pattern of the coating agent, and the coating agent is continuously supplied through the passage 4 irrespective of the reciprocation of the element 3. The suction passage 5 begins to suck a coating agent when the reciprocation of the element 3 is started and stops to suck the agent when the advancement of the element 3 is finished, and discontinuous coating layers are formed on both side faces of the base material 2 simultaneously and continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms an intermittent coating layer of an electrode mixture formed on both side surfaces of a base material sheet, such as an electrode plate for a lithium ion secondary battery, continuously on both side surfaces simultaneously. A coating die that can be used.

[0002]

2. Description of the Related Art As a coating die of this type, there is a coating die disclosed in JP-A-1-194265, which is used for manufacturing an electrode plate for a lithium manganese secondary battery.

As shown in FIG. 7, the coating die 100 has a base sheet 104 made of aluminum foil from an unwinder 103 in a state where a coating material 102 is stored in a storage portion 101.
While moving the base material sheet 104 in the direction of the arrow, slide the shutter members 105, 105 in the direction a so as to be stationary at this position (the position shown in FIG. 7) for a predetermined time, and then the doctor blade 106, The shutter members 105 and 105 are slid in the b direction until they abut against 106, and are kept stationary at this position for another predetermined time, and these operations are sequentially repeated.

In FIG. 7, reference numeral 107 is a guide member, reference numeral 108 is a dryer, reference numeral 109 is a winder, and reference numeral 110 is a turn roller.

When the shutter member 105 slides in the direction a, the shutter member 105 and the doctor blade 1
06, and the coating agent 102 is simultaneously applied from the stagnant portion 101 to both side surfaces of the base sheet 104, and the coating agent 102 is scraped off by a doctor blade 106, and the coating agent 102 is transferred to the base sheet 104. A predetermined thickness is simultaneously applied to both side surfaces of the.

Further, when the shutter member 105 is slid in the direction b, the shutter member 105 and the doctor blade 106 are in contact with each other, and the base sheet 1 from the retention portion 101.
04, the supply of the coating agent 102 to the
Is not applied to the base sheet 102.

Therefore, in the coating die 100, the shutter member 1 is moved while moving the substrate sheet 104.
By repeatedly sliding 05 in the a direction and the b direction, the coating agent 102 is simultaneously applied to both side surfaces of the base sheet 104.
The intermittent coating layer of can be continuously formed.

FIG. 8 shows another method for forming the intermittent coating layer.

The method of forming the intermittent coating layer is to form the intermittent coating layer of the coating agent 102 on each side of the base sheet 104.

That is, the coating die 200, which is connected to the retention portion 101 of the coating agent 102 by the transport pipe 121, is controlled so as to come into contact with or separate from the base material sheet 104 which runs according to the coating pattern of the intermittent coating layer to be formed. When the coating die 200 approaches the base sheet 104, the coating layer 120 is formed on one surface of the base sheet 104 (see FIG. 8A), and the coating die 200 is separated from the base sheet 104. The non-coating portion 122 is formed by the coating die 2 (see FIG. 8B).
By repeating the contact and separation of 00, an intermittent coating layer having a desired coating pattern can be formed on one surface of the base sheet 104. At this time, the coating die 200 supplies the coating agent 102 when the coating die 200 approaches the base sheet 104, and interrupts the supply when the coating die 200 separates from the base sheet 104. This method for forming the intermittent coating layer is the same as the method for forming the intermittent coating layer by the coating die 200 described above.
It is possible to form an intermittent coating layer having a desired coating pattern on both sides of the base material sheet 104, by carrying out each step of No. 04.

[0011]

However, the conventional coating dies 100 and 200 have the following problems, respectively.

First of all, the coating die 100 has a retention portion 1
Since 01 has an open structure, the coating agent 102 is easily deteriorated by oxidation before contact with the base material sheet 104, and since the coating pressure is zero, the adhesive strength of the coating layer cannot be increased, and thus the coating layer. However, there is a problem that the quality of the product is deteriorated.

Further, in the coating die 100, it is necessary to open and close the shutter member 105 frequently depending on the coating pattern of the intermittent coating layer, so that the liquid level of the coating agent 102 may fluctuate and the thickness of the coating layer may change. In addition, there is also a problem that since the dipping method relies on the natural adhesion of the coating agent 102 to the base sheet 104, the uniformity and surface smoothness of the coating layer are poor, and the film thickness accuracy is poor. ing.

Next, in the coating die 200, since the intermittent coating layer is formed by using the coating die on each side of the substrate sheet 104, the coating layers on both sides are recoated on the opposite side after the one side coating is completed. 120 alignment with each other is difficult,
If this alignment is attempted with high accuracy, there is a problem that the price of the molded product will increase.

Further, the coating die 200 stops the supply of the coating agent 102 when it is separated from the base material sheet 104, but at that time, a liquid dripping 200a of the coating agent 102 occurs (see FIG. 8B). Due to the dripping 200a, a bulged portion 120a appears at the coating start end portion during re-coating (FIG. 8C).
As a result, there is also a problem that the thickness of the coating layer 120 fluctuates and the film thickness accuracy deteriorates.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to easily and inexpensively form an intermittent coating layer having a desired coating pattern on both side surfaces of a base material. Another object of the present invention is to provide a coating die capable of forming an intermittent coating layer with improved quality and accuracy of the coating layer.

[0017]

In order to achieve the above-mentioned object, the invention according to claim 1 is such that a pair of die elements for applying a coating agent to both coating surfaces of a running base material are provided on the coating surface. A supply flow path for supplying the coating agent that opens a discharge port to the facing mating surface, and a suction flow path that opens a suction port on the mating surface so as to be able to suck the coating agent supplied from the discharge port Each of them is formed so that it is independently controlled to repeat the advancing / retreating operation with respect to the base material according to the coating patterns to be formed on the both sides of the coating surface, and the supply channel is the die element. While continuing to supply the coating agent regardless of whether the die element advances or retracts, the suction flow passage starts suction of the coating agent when the die element starts moving backward, and stops the suction when the die element moves forward. It is characterized in that it is your.

Therefore, in the invention of claim 1, the coating layer of the coating agent is formed on the base material in a state where the die element is advanced to the base material, and is not applied to the base material in a separated state retracted from the base material. To form a part. Then, the pair of die elements, by repeating the advancing and retracting operation independently with respect to the base material in accordance with the coating pattern to be formed on the coating surfaces on both sides of the base material, simultaneously, on the both coating surfaces of the running base material, The intermittent coating layer of the coating pattern can be continuously formed.

At this time, since the coating agent is discharged from the discharge port of the supply channel and is maintained in the closed system, deterioration due to oxidation or the like is suppressed as much as possible, and the coating pressure has sufficient adhesive strength. Then, a coating layer can be formed.

Further, since the suction flow passage continues to suck the coating material discharged from the supply flow passage from the start of the backward movement of the die element to the end of the forward movement when forming the non-coated portion, the non-coated portion is formed. It is possible to prevent dripping of the coating agent at the time of
As a result, it is possible to prevent the thickness of the coating layer from varying during re-coating due to the liquid dripping.

The invention according to claim 2 is the coating die according to claim 1, wherein the coating agent is a battery electrode mixture and the substrate is a battery electrode plate substrate sheet. It has a feature.

For this reason, in the invention according to claim 2, the intermittent coating layer of the electrode mixture having an appropriate adhesive strength and a proper film thickness accuracy is formed on the base sheet for battery electrode plates while suppressing the deterioration of the electrode mixture. It can be formed on both side surfaces simultaneously and continuously.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below.

FIGS. 1 to 3 show a coating die 1 as one embodiment used for manufacturing an electrode plate for a battery.

The coating die 1 is provided with a supply channel 4 for supplying an electrode mixture as a coating agent and a suction channel 5 for sucking the electrode mixture supplied from the supply channel 4. The pair of die elements 3 and 3 independently advance and retreat with respect to the base material sheet 2 according to the coating pattern of the electrode mixture to be formed on both side surfaces of the base material sheet 2 for battery electrode plate as the base material. Is controlled so as to repeat the above, and the supply channel 4 continues to supply the electrode mixture regardless of whether the die element 3 advances or retracts, and the suction channel 5 sucks the electrode mixture when the die element 3 starts to retract. Start die element 3
The structure is generally controlled so as to stop the suction at the end of the forward movement.

That is, the coating die 1 is provided with a pair of die elements 3, 3 which are arranged to face each other on both left and right sides with the base sheet 2 interposed therebetween.
A slit-shaped space 21 is formed between the three. As shown in FIG. 2, the slit-shaped space 21 is closed by side plates 22 and 24 on both sides in the width direction of the base sheet 2 (vertical direction in FIG. 2). The side plates 22 and 24 are fixed to the side surfaces of the die elements 3 and 3, and the surfaces 22a and 24a facing each other are abutted against each other to be in close contact with each other. The base sheet 2 is supported by an upper roller 20 and a lower roller 13 provided close to the pair of die elements 3 and 3, and is vertically regulated at an intermediate portion of the slit-shaped space 21. The swing of the base material sheet 2 during application of the agent is regulated. As shown in FIG. 4, the upper roller 20 and the lower roller 13 are provided so as to sandwich both side edges of the base sheet 2 on which the electrode mixture coating layer 30a is not formed, from both sides.

The pair of die elements 3 and 3 are formed substantially symmetrically and each is composed of an upper block 6, a middle block 7 and a lower block 8. The outer side (the side away from the slit-shaped space 21) of the upper block 6 and the middle block 7 is fixed by a bolt 14, and the space between the upper block 6 and the middle block 7 has been described above from the outside. The supply channel 4 for supplying the electrode mixture is formed, and the middle block 7 and the lower block 8 are fixed by bolting (not shown) at appropriate positions (not shown). A suction passage 5 connected to an external suction pump (not shown) is formed between the lower block 8 and the lower block 8.

The supply flow path 4 is provided so as to communicate with the slit-shaped space 21 by the discharge port 4a opened in the recess 3b of the mating surface 3a of the die element 3 facing the coating surface of the base material sheet 2. In addition, the suction flow path 5 is provided so as to communicate with the space 21 by the suction port 5a opened in the recess 3b of the mating surface 3a in the vicinity of the discharge port 4a (see FIG. 3). At this time, the discharge port 4a is the suction port 5a.
Is provided on the downstream side along the traveling direction of the base sheet 2 (indicated by the arrow in FIGS. 1 and 3).

The slit-shaped space 21 has a thickness obtained by adding the respective thicknesses of the upper space 21a located on the downstream side of the discharge port 4a to the base sheet 2 and the electrode mixture applied to both surfaces of the base sheet 2. On the other hand, the lower space 21b located upstream of the suction port 5a is formed with a thickness dimension substantially corresponding to the thickness dimension of the base sheet 2.

In the lower block 8 at the lower end of the lower space 21b, the sealing material is arranged so as to face each other with the base sheet 2 interposed therebetween, and extends to a position reaching the outer surface of the side plates 22 and 24. 11 are provided (see FIG. 2). One sealing material 11 is fixed in one lower block 8, and the other sealing material 11 is urged toward the base sheet 2 side by a spring 12 in the other lower block 8. By urging the sealing material 11 toward the base material sheet 2, the respective sealing materials 11, 11 come into close contact with the base material sheet 2, thereby sealing the inlet portion of the base material sheet 2 in the space 21. Will be.

The lower portion of the slit-shaped space 21 in which the electrode mixture is discharged in this manner is sealed by the sealing materials 11 and 11, and the side plates 22 and 24 are sealed on both sides in the width direction of the base sheet 2. Therefore, leakage of the electrode mixture from the bottom and the side to the outside is avoided.

The supply flow path 4 is formed in a linear shape at a part upstream from the discharge port 4a, and the linear portion 4c is formed in the discharge port 4a.
It is arranged to be inclined with respect to the base material sheet 2 so that a is located on the downstream side in the moving direction of the base material sheet 2. A bent portion 4d is formed at the upstream end of the linear portion 4c, and the bent portion 4d
The supply flow path 4 on the upstream side of d is extended in the horizontal direction, and further upstream, the flow path area increases toward the upstream side.
A supply port 4b is formed at its upstream end. further,
One end (upper end) of an inlet channel 4e formed in the middle block 7 is connected to the lower side of the supply port 4b, and the other end (lower end) of the inlet channel 4e is an electrode outside the die element 3. It is connected to a passage (not shown) through which the mixture is supplied.

Since the linear portion 4c of the supply flow path 4 is formed so as to be inclined with respect to the base sheet 2 as described above, the electrode mixture from the discharge port 4a moves forward in the moving direction of the base sheet 2. As a result, the liquid is ejected in an oblique direction, and as a result, the coating work can be carried out smoothly and a highly accurate coating work can be performed.

Further, the suction passage 5 has a linear portion 5c which is formed in an inclined shape upstream from the suction port 5a, a bent portion 5d which is formed at the upstream end of the linear portion 5C, and the bent portion. 5d extending horizontally from the suction port 5b formed at this extended end and a suction passage 5e having one end communicating with the suction port 5b and the other end communicating with a suction means (not shown) outside the die element 3. It is configured. The suction passage 5 has a structure in which the linear portion 5c is narrowed and has a smaller passage area than the other bent portions 5d and the suction port 5b, and is discharged from the discharge port 4a of the supply flow passage 4. Recess 3b of mating surface 3a
It is possible to efficiently inhale the electrode mixture that has accumulated in.

The upper block 6 is composed of a fixed portion 6b fixed to the middle block 7 by a bolt 14 and a displacement portion 6a forming an upper space 21a of the space 21, and the displacement portion 6a and the fixed portion 6b are adjustment bolts. 9 are connected. The adjustment bolt 9 is provided so as to be movable in the left-right direction with respect to the fixed portion 6b, and the screw portion 9a at the tip is screwed into the displacement portion 6a, and the head portion 9b is located outside the fixed portion 6b. . The adjusting bolt 9 is formed with an operating portion 9c further extending from the head portion 9b so as to project from a block 10 mounted on the fixing portion 6b so as to cover the head portion 9b.

In such a structure, the adjusting bolt 9
By rotating the operation unit 9c via the operation unit 9c, the displacement unit 6a
While being bent, they are displaced in a direction in which they approach and separate from each other, and it is possible to adjust the interval of the upper space 21a. Upper space 2
By adjusting the interval of 1a, the thickness of the electrode mixture applied to both surfaces of the base material sheet 2 will be adjusted.

The pair of die elements 3 and 3 comprises a movable block 1
The movable blocks 15 and 15 are fixed on the
Ball screws 16 and 1 extended in the left-right direction in FIG.
6 is screwed. Both ends of the ball screws 16 and 16 are rotatably supported by the mounting brackets 17 and 19 on the bases 18 and 18, respectively, and the operation parts 16a and 16a at the ends of the ball screws 16 and 16 are rotated to operate, The movable blocks 15 and 15 move in the left and right directions, respectively. By this movement, the die elements 3 and 3 are moved in the left and right directions, respectively.

At this time, the pair of die elements 3, 3 are to be formed on both coating surfaces of the base sheet 2 by, for example, an AC servomotor, which are connected to the respective operating portions 16a, 16a of the ball screws 16, 16. The base sheet 2 is controlled to repeat the advancing / retreating operation independently of each other according to the coating pattern. Each of the pair of die elements 3 and 3 is in a state of applying the electrode mixture when advancing and approaching the base sheet 2 (state of FIG. 1), and when moving backward from the base sheet 2 and separated from the electrode. The mixture is not applied.

The supply passage 4 continues to supply the electrode mixture regardless of the advance / retreat of the die element 3 by a pump mechanism (not shown) linked to the inlet passage 4e, and the suction passage 5 forms the suction passage. A switching mechanism (not shown) provided in 5e starts suction of the electrode mixture when the die element 3 starts moving backward, and immediately after that, the die element 3
Is controlled so as to stop the suction at the end of the forward movement. Suction of the electrode mixture in the suction channel 5 and stoppage of the suction must be performed instantaneously, so control by switching the valve is preferable.

Coating die 1 thus constructed
Works as follows.

5 (a) and 5 (b) show coating patterns to be formed on both coating surfaces 2a, 2b of the base sheet 2, respectively. That is, the coating pattern to be formed on the coating surface 2a is the intermittent coating layers 30a, 30b, 30 of the electrode mixture sandwiching the non-coated portion 30 where the electrode mixture is not coated.
., and the coating pattern to be formed on the coating surface 2b is an intermittent coating layer 31a, 31b, 31c, 31c, 31c
Consists of ...

In the coating die 1, the pair of die elements 3 and 3 and the suction passage 5 are controlled and operated in accordance with the above-mentioned coating pattern in the process of moving the substrate sheet 2 upward. , Intermittent coating layers 30a, 30b, 30c of the electrode mixture according to the coating pattern described above,
, And 31a, 31b, 31c, ... Can be obtained. During the process of forming the intermittent coating layer, the supply channel 4 continues to supply the electrode mixture.

That is, the coating layer 30a shown in FIG.
In the α step for simultaneously forming 31a, as shown in FIG. 6 (a), the pair of die elements 3 and 3 is in a coating posture in which the die elements 3 and 3 are advanced with respect to the base sheet 2, and c
By the electrode mixture 50 supplied from the direction, the coating layers 30a,
31b is formed. At this time, the suction passages 5 and 5 of the pair of die elements 3 and 3 have stopped sucking the electrode mixture.

Further, in the β step shown in FIG. 5B, in which the formation of the coating layer 30a is stopped and the coating layer 31a is to be formed subsequent to the α step, as shown in FIG. One die element 3 facing the coating surface 2a of the material sheet 2 is in a non-coating state retracted from the base sheet 2, and the other die element 3 facing the coating surface 2b of the base sheet 2 continues to the α step. Ready to apply. At this time, the suction flow path 5 of one die element 3 is d when the die element 3 starts to retract.
Direction suction is started, and the suction is continued while in the non-application state. As a result, the formation of the coating layer 30a is stopped and the desired coating layer 30 can be formed, and the electrode mixture 50 supplied from the supply channel 4 is sucked into the suction channel 5 without causing liquid dripping. Be done. The other die element 3 is α
Following the process, the coating layer 31a is formed. At this time, the suction flow path 5 of the other die element 3 has stopped sucking the electrode mixture.

Further, in the γ step shown in FIG. 5B, in which the formation of the coating layer 30a is stopped following the β step and the formation of the coating layer 31a is stopped, as shown in FIG. 6C. One die element is in a non-coating state following the β step, and the other die element 3 is in a non-coating state in which it is retracted from the base sheet 2. At this time, the suction flow path 5 of the other die element 3 starts suction in the d direction when the die element 3 starts moving backward, and continues the suction while in the non-coating state.
As a result, the formation of the coating layer 31a is stopped and the desired coating layer 3 is formed.
1a can be formed and the electrode mixture 50 supplied from the supply flow path 4 is sucked into the suction flow path 5 without causing liquid dripping.

Furthermore, the base sheet 2 shown in FIG. 5 (b)
Coating layers 30b and 31b on both coating surfaces 2a and 2b
In the second α step for forming the film, the pair of die elements 3, 3 in the non-coating state advances toward the base sheet 2 to become the coating state shown in FIG. In the same manner as the α step, both coated surfaces 2a, 2 of the base material sheet 2
The coating layers 30b and 31b can be simultaneously formed on the substrate b. At this time, the suction flow paths 5, 5 of the pair of die elements 3, 3
Stops the suction at the end of advancing the die element 3 to the base sheet 2.

Thereafter, the α, β and γ steps are repeated according to the coating pattern to be formed, so that desired intermittent coating layers 30a, 30b, 30c, ... And on the both coating surfaces 2a, 2b of the base sheet 2, respectively. 31a, 31b, 3
1c, ... Can be formed simultaneously and continuously.

Thus, according to the coating die 1,
Coating layers 30a (30) on both sides 2a, 2b of the base sheet 2
b), 30c, ...) And 31a (31b, 31c, ...) Are not required to be aligned with each other, and the battery electrode plate can be easily and inexpensively formed.

Further, according to this coating die 1, the electrode mixture 50 is discharged from the discharge port 4 of the supply flow path 4 and is maintained in a closed system so that it does not come into contact with air. The deterioration due to the oxidation of 50 is avoided,
Moreover, the coating pressure can be increased.

Moreover, according to this coating die 1,
It is possible to prevent dripping of the electrode mixture 50 when forming the non-coated portions 30 and 31, whereby the coated layer 30a.
The thickness variation of (30b, 30c) and 31a (31b, 31c) can be prevented and a uniform coating layer can be formed, and the film thickness accuracy is improved.

Therefore, according to this coating die 1, it is possible to manufacture a battery electrode plate of improved quality.

[0052]

According to the present invention, as described in detail above, the following effects can be obtained.

That is, according to the invention of claim 1,
The pair of die elements independently repeats the forward / backward movement with respect to the base material in accordance with the coating pattern to be formed on the coating surfaces on both sides of the base material, thereby simultaneously applying the coating on both the coating surfaces of the running base material. Since the intermittent coating layer of the pattern can be continuously formed, it is not necessary to align the coating layers on both sides with each other, and it is possible to provide a coating die capable of easily and inexpensively forming the intermittent coating layer. .

According to the first aspect of the invention, since the coating agent is maintained in a closed system, deterioration due to oxidation or the like is suppressed as much as possible, and the coating layer has sufficient adhesive strength by the discharge pressure. Therefore, it is possible to form an intermittent coating layer with improved quality.

Further, according to the first aspect of the present invention, the discharge of the coating agent from the supply flow path is not stopped and is continued regardless of the advance / retreat of the die element, and at the time of forming the non-coated portion. Since the liquid dripping of the coating agent can be prevented by sucking the coating agent through the suction flow path, and by extension, the fluctuation of the thickness of the coating layer at the time of re-coating due to the liquid dripping can be prevented, the film thickness It is possible to form an intermittent coating layer with improved accuracy.

According to the second aspect of the present invention, the intermittent coating layer of the electrode mixture having a suitable adhesive strength and film thickness accuracy is formed on the base sheet for a battery electrode plate while suppressing the deterioration of the electrode mixture. Since it can be formed on both side surfaces simultaneously and continuously, a battery electrode plate with improved quality can be manufactured in addition to the effect of the invention described in claim 1.

[Brief description of the drawings]

FIG. 1 is a sectional view of a coating die according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is an enlarged sectional view of a portion A in FIG.

FIG. 4 is an explanatory view of a roller for supporting a base material sheet, which is provided in the coating die of FIG.

FIG. 5 shows a base sheet having an intermittent coating layer, (a)
Shows a plan view and (b) shows a cross-sectional view taken along the line C-C of (a).

6 (a), (b), and (c) are operation state diagrams of a pair of die elements in each step of forming the intermittent coating layer of FIG.

FIG. 7 is a schematic manufacturing process drawing of an intermittent coating layer using a conventional coating die.

FIG. 8 shows the formation of an intermittent coating layer using another conventional coating die, and (a) and (b) are explanatory diagrams of each step,
(C) shows sectional drawing of the formed coating layer, respectively.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Coating die 2 Base material sheet (base material) 3 Die element 4 Supply flow path 4a Discharge port (of supply flow path) 5 Suction flow path 5a Suction port (of suction flow path) 30a, 30b, 30c, 31a, 31b, 31c coating layer 50 electrode mixture (coating agent)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Gen Takayama 3-4-10 Minami-Shinagawa, Shinagawa-ku, Tokyo Within Toshiba Battery Co., Ltd. (72) Inventor Yoshiyuki Sakai 2068-3 Ooka, Numazu-shi, Shizuoka Toshiba Machine Co. Numazu Office

Claims (2)

[Claims] 1. A pair of die elements for applying a coating agent to both coating surfaces of a running base material, respectively, and a supply flow path for supplying the coating agent having a discharge port at a mating surface facing the coating surface. A suction passage that opens a suction port in the mating surface so as to be capable of sucking the coating agent supplied from the discharge port, and respectively according to the coating patterns to be formed on the both side coating surfaces, respectively. The substrate is independently controlled to repeat the advancing / retreating operation, and the supply passage continues to supply the coating agent regardless of the advancing / retreating of the die element, and the suction passage is When the die element starts to retract, the suction of the coating material is started,
A coating die controlled to stop the suction at the end of the advance of the die element. 2. The coating die according to claim 1, wherein the coating material is a battery electrode mixture, and the base material is a battery electrode plate base material sheet.