JP2009172513A - Method and apparatus for coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for coating capable of administering by controlling a coating film width and a coating film thickness in a production line. <P>SOLUTION: The method for coating a paste material on the surface of a strip sheet 20 with a coating die 11 by a predetermined coating film width and a predetermined coating film thickness comprises the step of measuring a coating film width W and varying the coating die 11 to the strip sheet 20 by a distance of 0.1 μm level to a coating film 10 on the basis of a measured value of the measuring step. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating method and a coating apparatus for applying a paste material to a surface of a belt-like sheet with a coating die with a predetermined coating film width and a predetermined coating film thickness.

A paste material is continuously applied on the surface of a belt-like sheet, dried, and then rolled to produce a battery. At this time, the positional deviation of the coated paste with respect to the sheet, the variation in the coating film width of the coated paste, and the variation in the coating film thickness of the coated paste will adversely affect the battery performance. It is managed in the process.
Here, the paste is continuously applied to the long belt-like sheet, and the long belt-like sheet is wound in multiple layers to constitute the battery. Therefore, the paste coating film width variation and the paste coating film thickness variation Will be accumulated. For this reason, the tolerance of the coating film width and the coating film thickness of the applied paste is managed with extremely small values.
However, it has been difficult to eliminate these deviations and variations in-line.
For example, in Patent Document 1, a coating region is determined based on a transmitted X-ray dose, and a paste feeder (coating die) is driven in the coating film width direction, thereby shifting the coating boundary position with respect to the belt-like sheet. Techniques for correcting are disclosed.

Japanese Patent No. 3680984

However, the invention disclosed in Patent Document 1 has the following problems.
That is, although the applied paste can cope with the positional deviation with respect to the belt-like sheet, the variation in the coating film width of the applied paste itself cannot be corrected. Further, it was not possible to correct the variation in the coating film thickness of the paste, particularly the variation in the film thickness at both ends of the coating film.

  This invention is for solving the above-mentioned problems, and provides a coating method and a coating apparatus capable of controlling and managing the coating film width or coating film thickness in-line. Objective.

In order to achieve the above object, the coating method or the coating apparatus of the present invention has the following configuration.
(1) A coating method in which a paste material is applied to a surface of a belt-like sheet with a coating die to a predetermined coating film width and a predetermined coating film thickness, and the coating film width or coating film thickness And a feedback step of moving the coating die with respect to the belt-like sheet in a direction different from the coating surface based on the measurement value of the measurement step.
(2) In the coating method described in (1), the distance between the coating die and the coating surface is changed based on the coating film width measured in the measurement step.
(3) In the coating method described in (1), an inclination of the coating die with respect to the coating surface is changed based on the coating film thickness measured in the measurement step.

(4) In any one of the coating methods described in (1) to (3), a plurality of coating surfaces are simultaneously formed by a plurality of coating dies, and the coating film from the end face of the belt-like sheet The position is measured, and the plurality of coating dies are individually moved in the coating film width direction based on the measured value.
(5) In any one of the coating methods described in (1) to (4), the coating is performed by scanning in the coating film width direction and measuring the distribution of the coating film thickness. The film width or the coating film thickness, and the coating film position are measured.

(6) A coating apparatus for applying a paste material to a surface of a belt-like sheet with a coating die to a predetermined coating film width and a predetermined coating film thickness, the coating film width or the coating film thickness And a coating die moving means for moving the coating die with respect to the belt-like sheet in a direction different from the coating surface based on the measurement value measured by the measuring means.
(7) In the coating apparatus described in (6), the distance between the coating die and the coating surface is changed by the coating die moving unit based on the coating film width measured by the measuring unit. It is characterized by that.

(8) In the coating apparatus described in (6), the coating die moving unit changes the inclination of the coating die with respect to the coating surface based on the coating film thickness measured by the measuring unit. It is characterized by.
(9) In any one of the coating apparatuses according to (6) to (8), a plurality of coating dies that simultaneously form a plurality of coating surfaces, and the coating from the end face of the belt-like sheet It has a control means for measuring the position of the film, and individually moving the plurality of coating dies in the coating film width direction based on the measured value.

Next, the operation and effect of the coating method and the coating apparatus of the present invention having the above-described configuration will be described.
As the measuring means of the present invention, for example, if a laser displacement meter is used to scan in the width direction of the coating surface, the coating film width and coating film thickness can be measured with a resolution of 0.1 μm to 1 μm. . Here, the coating film thickness hardly changes in the actual manufacturing process, but the coating film width easily changes in the actual manufacturing process by changing the paste lot and the solid content ratio. End up. Even if the solid content rate of the paste is controlled within plus or minus 1%, the coating film width changes by about 0.2%.
Since a paste is continuously applied to a long belt-like sheet and a battery is manufactured by wrapping long belt-like sheets in multiple layers, the coating film has a coating film width variation of 0.2%. Since there are positions where there is a coating film and a position where there is no coating film at the edge of the width, variations are accumulated, and the overall thickness of the wound sheet can vary, which adversely affects battery performance. There is a fear.

The paste is applied continuously while automatically changing the roll. Therefore, since the lot of the paste is changed regardless of the position of application to the roll, the solid content ratio of the paste changes and the coating film width changes from the time when the lot of the paste is changed. May adversely affect performance. And since it coats continuously, a coating process cannot be interrupted and a coating film width | variety cannot be adjusted.
On the other hand, the present inventor has found that the distance between the coating die and the belt-like sheet and the coating film width change in a substantially linear relationship. It was also discovered that the width of the coated surface can be controlled at a level of 0.01 to 0.1 mm by changing the distance between the coating die and the belt-like sheet at a level of 0.1 μm.

The measuring means (for example, a laser displacement meter) of the present invention, for example, scans a belt-like sheet in the width direction, and quickly changes the coating film width and the coating film thickness when the paste lot changes. And the width | variety of a coating film is controlled to the predetermined value by measuring correctly and changing the distance of a coating die and a strip | belt-shaped sheet | seat based on the measured value.
As a result, even if the lot of the paste changes, the solid content ratio of the paste changes, and the coating film width changes, the measuring means measures the coating film width quickly and accurately, and the coating die Therefore, the coating film width on the coating surface can be accurately controlled in-line, and the battery performance can be improved.

  The functions and effects described above can be applied in the same manner even when the coating film thickness varies at both ends of the coating film. In other words, if there is a variation in the coating film thickness at both ends of the coating film measured with a laser displacement meter, the coating die faces away from the coating film thickness variation with respect to the coating surface of the belt-like sheet. By inclining, the variation in the coating film thickness can be corrected. Inclining the coating die with respect to the coating surface means that the distance between the coating die and the coating surface is different at both ends of the coating die.

Further, the measurement by the laser displacement meter also measures the end face of the belt-like sheet, and also measures the distance from the end face of the belt-like sheet to the start position of the coating film. The position of the coating film can be controlled by measuring the position in the width direction of the coating film with respect to the belt-like sheet and moving the coating die in the width direction based on the measured value.
In the present invention, in order to increase production efficiency, three strips of coating film are simultaneously applied to one belt-like sheet using three coating dies. And since the belt-shaped sheet | seat after being coated is cut | disconnected in two places, three coating sheets are made, and it winds up and manufactures the battery, The coating film of the 2nd item and the 3rd item | stripes It is necessary to increase the position accuracy of the start position from the end face of the belt-like sheet before cutting. In order to maintain the positional accuracy, it is important to control the position of the coating film with respect to the belt-like sheet.
According to the present invention, the start position of the first strip coating film, the start position of the second strip coating film, and the start position of the third strip coating film from the end face of the belt-like sheet are respectively separated by separate coating dies. Therefore, the starting position of each strip coating film from the end face of the belt-like sheet can be controlled accurately.

Hereinafter, an embodiment which embodies a coating method and a coating apparatus in the present invention will be described in detail with reference to the drawings.
FIG. 2 shows the overall configuration of the coating / drying process, and FIG. 1 shows a front view of the coating apparatus. The belt-like sheet 20 supplied from the supply roller 21 around which the belt-like sheet 20 is wound winds the backup roller 22, winds the measuring roller 23, and enters the drying furnace 25. On the lower surface of the backup roller 22, a coating die 11 for applying a paste material to the belt-like sheet 20 is installed. A laser displacement meter 24 as a measuring means is installed at a position facing the measuring roller 23.
The belt-like sheet 20 exiting the drying furnace 25 is wound around a winding roller 28 after winding a roller 26 and a roller 27.

As shown in FIG. 1, three strips of coating films 10A, 10B, and 10C coated with paste are formed on the surface of the belt-like sheet 20 by coating dies 11A, 11B, and 11C. FIG. 3 schematically shows that the coating film 10 is applied to the belt-like sheet 20 by one coating die 11. FIG. 4 is a side sectional view of FIG. The paste material in the supply part 11b in the coating die 11 is applied to the belt-like sheet 20 through the supply channel 11a. Let G be the distance between the coating die 11 and the belt-like sheet surface (coating surface). As shown in FIG. 3, the coating die 11 is movable with respect to the belt-like sheet 20 in the approaching direction (direction in which G is reduced) or in the direction in which it is moved away (in the direction in which G is increased). It can also be moved in the left-right direction in the figure.
The applied coating film 10 is dried by passing through the drying furnace 25. And it is wound up by the winding roller 28 and conveyed to the next step.
Here, the coating process and the drying process are performed continuously. The supply roller 21 and the take-up roller 28 are sequentially replaced with new ones. Even when the supply roller 21 and the take-up roller 28 are replaced, a buffer (not shown) is provided between the supply roller 21 and the backup roller 22 and the take-up roller 28 in order to continuously operate the coating process and the drying process. And the roller 27.

Next, the coating apparatus of the present invention will be described in detail. As shown in FIG. 1, three coating dies 11 </ b> A, 11 </ b> B, and 11 </ b> C are independently installed immediately below the belt-like sheet 20 wound around the backup roller 22. A mechanism for moving the coating die 11 relative to the belt-like sheet 20 wound around the backup roller 22 is shown in FIG.
A positioning pin 12a stands upright at the right end of the upper and lower bases 12 on which the coating die 11 is fixed and placed, and a positioning pin 12b stands upright at the left end. A positioning piece 15 is slidably attached in the direction of arrow B in the figure at a position facing the positioning pin 12a. The lower surface of the positioning piece 15 forms an inclined surface 15a with a slight angle. In FIG. 5, in order to make it easy to see, the inclined surface 15a is described so as to have a large inclination angle. However, the actual inclined surface 15a only changes in height by about 0.1 μm with respect to a length of 1 mm. It is an inclined surface with a very small angle. The positioning piece 15 is moved in the arrow B direction by a motor (not shown).

A positioning piece 14 is slidably attached in the direction of arrow A in the figure at a position facing the positioning pin 12b. The lower surface of the positioning piece 14 forms an inclined surface 14a having a slight angle. In FIG. 5, in order to make it easy to see, the inclined surface 14a is described so as to have a large inclination angle. However, the actual inclined surface 14a only changes in height by about 0.1 μm with respect to a length of 1 mm. It is an inclined surface with a very small angle. The positioning piece 14 is moved in the direction of arrow A by a motor (not shown). The motor that slides the positioning piece 15 and the motor that slides the positioning piece 14 are separate motors and are individually controlled.
The upper and lower bases 12 are held by the left and right bases 13 so as to be slidable in the vertical direction. The upper and lower bases 12 are urged upward by a right pneumatic cylinder 17 and a left pneumatic cylinder 16 fixed to the left and right bases 13.
Since the upper and lower bases 12 are biased upward by the two pneumatic cylinders 16 and 17, the positioning pin 12 a comes into contact with the inclined surface 15 a of the positioning piece 15, and the positioning pin 12 b comes into contact with the inclined surface 14 a of the positioning piece 14. ing.

There is naturally a backlash between the upper and lower bases 12 and the left and right bases 13 holding them at the μm level. Since the upper and lower bases 12 and the coating die 11 have high rigidity and high manufacturing accuracy in the height direction, the height at the upper left end of the coating die 11, that is, the distance from the belt-like sheet 20 is the inclination of the positioning piece 14. It is uniquely determined by the position of the surface 14a. Further, the height at the upper right end of the coating die 11, that is, the distance from the belt-like sheet 20 is uniquely determined by the position of the inclined surface 15 a of the positioning piece 15.
For example, if the positioning piece 14 moves slightly to the left and the position where the inclined surface 14a contacts the positioning pin 12b approaches the belt-like sheet 20 side by 0.1 μm, the upper left corner of the coating die 11 and the belt-like shape The distance from the sheet 20 approaches 0.1 μm.

If the positioning piece 14 and the positioning piece 15 are both moved by the same distance in the outer direction, the distance between the coating die 11 and the belt-like sheet 20 can be reduced by a distance corresponding to the inclination at a level of 0.1 μm. it can. Further, if both the positioning piece 14 and the positioning piece 15 are moved by the same distance in the inner direction, the distance between the coating die 11 and the belt-like sheet 20 can be increased by a distance corresponding to the inclination, at a level of 0.1 μm. Can do.
If the level is from 0.1 μm to several μm, when only one of the positioning pieces 14 and 15 is moved, the coating die 11 is moved relative to the belt-like sheet 20 by the backlash of the guide device. It will be in the state which only inclined.

  The left and right bases 13 are held by the guide rails 18 so as to be movable in the left and right directions. The left and right bases 13 are connected to a ball screw (not shown), and the coating die 11 can be moved in the width direction of the coating film 10 with respect to the belt-like sheet 20 by the rotation of the ball screw. Each of the coating dies 11A, 11B, and 11C includes upper and lower bases 12A, 12B, and 12C, and left and right bases 13A, 13B, and 13C. The coating dies 11A, 11B, and 11C are related to other coating dies. Independently, the distance relationship, the inclination relationship, and the width direction positional relationship with the belt-like sheet 20 can be changed.

Next, measurement by the laser displacement meter 24 will be described. As shown in FIG. 1, the laser displacement meter 24 is held on a rail 29 so as to be movable along the width direction of the coated surface 10 with respect to the belt-like sheet 20 wound around the measuring roller 23. . The laser displacement meter 24 measures the distance to the target surface with a resolution of 0.1 μm by transmitting laser light and receiving reflected light from the symmetry plane. The laser displacement meter 24 scans the rail 29 from a position indicated by a solid line in FIG. 1 to a position indicated by an imaginary line with a ball screw (not shown). The time required for one scan is about 20 seconds. Since the speed | velocity | rate of the strip | belt-shaped sheet | seat 20 is 40 m / min, it will measure every 10 m to 20 m.
Here, the laser displacement meter 24 also measures the rotation unevenness of the measuring roller 23. In this embodiment, since the rotation unevenness of the measuring roller 23 is measured in advance and corrected, the film thickness of the coated surface can be accurately measured.

Data of actual measurement values measured by the laser displacement meter 24 is shown in FIG. The horizontal axis indicates the position in the width direction of the belt-like sheet, and the vertical axis indicates the film thickness. H1 indicates the surface height of the measuring roller 23 without the belt-like sheet 20. H2 represents the thickness of the belt-like sheet 20. HA, HB, and HC indicate the film thickness of the paste to which the coating films 10A, 10B, and 10C are applied. The film thickness of the coating film 10 is 50 to 100 μm in the wet state before drying, and 20 to 40 μm in the dry state after drying. WA, WB, and WC represent the lengths of the coating film widths of the coating films 10A, 10B, and 10C.
In this embodiment, the purpose is to measure changes in the coating film width W and the film thickness H of the coating film 10 due to the change in the solid content ratio of the paste. The thickness is measured.

Next, the coating method of the present invention will be described.
FIG. 8 shows the relationship between the solid content ratio of the paste and the coating film width of the coating film 10. The horizontal axis indicates the solid content ratio (unit%) of the paste, and the vertical axis indicates the coating film width W (unit: mm). The dotted line indicated by M in the figure indicates the relationship between the change in the solid content ratio and the change in the coating film width W.
When the solid content of the paste changes from 38% to 40%, the coating film width W decreases by about 0.3 mm. The present inventor confirmed that the viscosity of the paste changes in correlation with the change in the solid content rate. That is, when the solid content rate is 38%, the viscosity is 700 mPa · sec at 1 rpm, and when the solid content rate is 40%, the viscosity changes to 1500 mPa · sec at 1 rpm. It is considered that the coating film width W decreases because the fluidity of the paste deteriorates due to the increase in viscosity.

  In the present embodiment, the coating film width W is measured at intervals of 10 to 20 m with respect to the belt-like sheet 20 by the laser displacement meter 24. Therefore, the paste lot is changed and the solid content ratio is changed. When the coating film width of the coating film 10 is changed, the positioning piece 14 and the positioning piece 15 are quickly moved left and right so that the distance between the coating die 11 and the belt-like sheet 20 is at a level of 0.1 μm. Since it is changed, the coating film width W can be accurately controlled in-line. That is, when the solid content rate of the paste is increased and the coating film width W is shortened, the positioning pieces 14 and 15 are slightly moved outward by the motor. As a result, the positions where the positioning pins 12b and 12a of the inclined surfaces 14a and 15a abut are moved to the belt-like sheet 20 side at a level of 0.1 μm, and the coating die 11 is 0.1 μm to the belt-like sheet 20. Approach by level.

FIG. 7 shows the relationship between the gap G, which is the distance between the coating die 11 and the belt-like sheet 20, and the coating film width W of the coating film 10. The horizontal axis indicates the gap G (unit: μm, 1 cell is 1 μm), and the vertical axis indicates the coating film width W (unit: mm, 1 cell: 1 mm) of the coating film 10.
The gap G between the coating die 11 and the belt-like sheet 20 and the coating film width W of the coating film 10 show a linear relationship. If the gap G is reduced, the coating film width W becomes longer. Here, in order to increase the coating film width W by about 1 mm, the gap G needs to be changed by about 2 μm. Since the variation of the coating film width W which is a problem of the present invention is about 0.3 mm, the gap G needs to be controlled at a level of 0.1 μm.
By bringing the coating die 11 closer to the belt-like sheet 20, the coating film width W can be increased at a level of 0.1 mm.

On the other hand, when the solid content rate of the paste is reduced and the coating film width W is increased, the positioning pieces 14 and 15 are slightly moved inward by the motor. As a result, the positions where the positioning pins 12b and 12a of the inclined surfaces 14a and 15a come into contact with each other are moved at a level of 0.1 μm in the direction away from the belt-like sheet 20, and the coating die 11 is 0. Move away at the 1 μm level.
By moving the coating die 11 away from the belt-like sheet 20, the coating film width W can be shortened to a level of 0.1 mm.

FIG. 8 shows the relationship between the solid content ratio of the paste and the coating film width of the coating film 10. The horizontal axis indicates the solid content ratio (unit%) of the paste, and the vertical axis indicates the coating film width W (unit: mm). The dotted line indicated by M in the figure indicates the relationship between the change in the solid content ratio and the change in the coating film width W. When the solid content rate of the paste changes from 38% to 40%, the coating film width W of the coating film 10 decreases by about 0.3 mm. This is a prior art.
The solid line indicated by N in the figure is feedback control of the distance between the coating die 11 and the belt-like sheet 20 in accordance with the coating film width measured by the laser displacement meter 24 by the coating method / coating apparatus of this embodiment. This is the data when changed by. According to the present Example, even if the solid content rate of a paste changes from 38% to 40%, it turns out that the coating film width W has hardly changed.
Three coating dies 11A, 11B, and 11C can individually control the coating film widths WA, WB, and WC of the three coating films 10A, 10B, and 11C applied simultaneously, so that coating can be performed simultaneously. Even if it is processed, each coating film width WA, WB, WC can be accurately controlled separately.

Next, control of the coating film thickness of the coating film 10 will be described.
The laser displacement meter 24 measures the film thickness of the coating film 10 simultaneously with the coating film width W. When the film thickness of the coating film 10 varies in the width direction, the film thickness variation can be eliminated by slightly tilting the coating die 11 with respect to the belt-like sheet 20.
In other words, when the film thickness of the coating film 10 is, for example, about 1 μm thicker than the film thickness at the right end, only the positioning piece 15 is moved slightly outward to move the coating die 11. Only the right end is moved away from the belt-like sheet 20 at a level of 0.1 μm. The coating die 11 is inclined at a level of 0.1 μm with respect to the belt-like sheet 20.
Thereby, the film thickness in the right end of the coating film 10 decreases, and the film thickness in the right end and the film thickness in the left end of the coating film 10 can be made uniform.
In the present example, the film thickness at the right end is reduced, but control for increasing the film thickness at the left end may be performed in consideration of the absolute value of the film thickness.

Next, position control of the coating film 10 from one end of the belt-like sheet will be described. In this embodiment, the three coating films 10A, 10B, and 10C are simultaneously applied to the belt-like sheet 20 by the three coating dies 11A, 11B, and 11C. Then, in the post-process after the drying process is completed, the belt-like sheet is cut at two locations at a predetermined distance from the left end portion of the belt-like sheet 20. Therefore, it is highly necessary to accurately maintain the position from the left end of the second coating film 10B and the third coating film 10C from the left end.
In this embodiment, the start positions of the coating films 10A, 10B, and 10C from the left end of the belt-like sheet 20 are measured by the laser displacement meter 24. If there is a deviation in the start positions, the left and right bases 13A and 13B , 13C are individually controlled on the guide rail 18 so as to eliminate the deviation, so that the start positions of the coating films 10A, 10B, and 10C are accurately set at a predetermined distance from the left end of the belt-like sheet 20. Can be maintained.

As described above in detail, according to the coating method and the coating apparatus of the present embodiment, the paste material is applied to the surface of the belt-like sheet 20 by the coating die 11 with a predetermined coating film width and a predetermined coating. A coating method for coating to a film thickness, wherein the coating die 11 is applied to the belt-like sheet 20 on the basis of the measurement process for measuring the coating film width W and the measurement value of the measurement process. When the distance to 10 is changed at a level of 0.1 μm, the solid content ratio of the paste to be applied changes, and the coating film width W of the coating film 10 changes at a level of 0.1 mm In addition, the coating film width W can be accurately controlled in-line in response to the slight change.
Moreover, the inclination with respect to the coating film 10 of the coating die 11 is changed based on the coating film thickness measured at the measurement process. That is, even when the coating film thickness is slightly different between the right end and the left end of the coating film 10, the distance of the coating die 11 to the coating surface of the belt-like sheet 20 is set only to the right end or only the left end of the coating die 11. Can be varied at a level of 1 μm. Thereby, the variation in the width direction of the film thickness of the coating film 10 can be eliminated.

Further, a plurality of coating films 10A, 10B, and 10C are simultaneously formed by a plurality of coating dies 11A, 11B, and 11C, and the positions of the coating films 10A, 10B, and 10C from the end surface of the belt-like sheet 20 are measured. Since the plurality of coating dies 11A, 11B, and 11C are individually moved in the coating film width direction based on the measured value, the sheet is cut at a plurality of positions with one end of the belt-like sheet 20 as a reference in the subsequent process. In this case, since the accuracy of the start positions of the coating films 10A, 10B, and 10C is accurately controlled from the reference end, the positions of the coating films 10B and 10C can be accurately maintained from the cut surface.
Further, by scanning the laser displacement meter 24 in the width direction of the coating film 10 and measuring the distribution of the coating film thickness, the coating film width or the coating film thickness and the coating film position are measured. Therefore, the coating film width W, the coating film thickness H, and the coating film position can be accurately controlled using in-line measurement values.

In addition, the coating apparatus is a coating apparatus that applies the paste material to the surface of the belt-like sheet 34 with the coating die 11 to a predetermined coating film width and a predetermined coating film thickness, and the coating film width or the coating film Based on the laser displacement meter 24 for measuring the thickness and the measurement value measured by the laser displacement meter 24, the coating die moving means changes the distance between the coating die 11 and the coating surface of the belt-like sheet 20, When the solid content ratio of the paste to be applied is changed and the coating film width W of the coating film 10 is changed at a level of 0.1 mm, the coating film width W is set corresponding to the slight change. Accurate control can be done inline.
Further, since the coating die moving means changes the inclination of the coating die 11 with respect to the coating surface of the belt-like sheet 20 based on the coating film thickness H measured by the laser displacement meter 24, the film of the coating film 10 Variations in the width of the thickness can be eliminated.
In addition, the positions of the coating dies 11A, 11B, and 11C that simultaneously form a plurality of coating surfaces and the coating films 10A, 10B, and 10C from the end face of the belt-like sheet 20 are measured, and based on the measured values. Since the control means for individually moving the plurality of coating dies 11A, 11B, and 11C in the coating film width direction is used, when cutting at a plurality of locations on the basis of one end of the belt-like sheet 20 in the subsequent process, Since the accuracy of the starting positions of the coating films 10A, 10B, and 10C is accurately controlled, the positions of the coating films 10B and 10C can be accurately maintained from the cut surface.

In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.
For example, in this embodiment, the laser displacement meter 24 is used to measure the coating film width W of the coating film 10, but the coating is performed by capturing an image with a CCD camera and processing the image. The film width W may be calculated.
In this embodiment, the distance between the coating die 11 and the coating surface of the belt-like sheet 20 is changed by the combination of the positioning pieces 14 and 15 and the pneumatic cylinders 16 and 17, but the elastically deformable frame. Alternatively, a method of holding the coating die 11 and applying elastic force to the frame to elastically deform at a level of 0.1 μm may be used.

It is a front view of a coating apparatus. It is a figure which shows the whole structure of a coating and a drying process. FIG. 2 is a schematic diagram in which a coating film 10 is applied to a belt-like sheet 20 by a single coating die 11. FIG. 4 is a side sectional view of FIG. 3. It is a figure which shows the mechanism which moves the coating die 11 with respect to the strip | belt-shaped sheet | seat 20 wound by the backup roller 22. FIG. 4 is a data diagram of actual measurement values measured by a laser displacement meter 24. FIG. 3 is a diagram showing a relationship between a gap G, which is a distance between a coating die 11 and a belt-like sheet 20, and a coating film width W of a coating film 10. FIG. 2 is a diagram showing a relationship between a solid content rate of a paste and a coating film width of a coating film 10. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coating film 11 Coating die 12 Upper and lower bases 13 Left and right bases 14 and 15 Positioning piece 20 Band-shaped sheet 24 Laser displacement meter

Claims (9)

In the coating method in which the paste material is applied to the surface of the belt-like sheet with a coating die with a predetermined coating film width and a predetermined coating film thickness,
A measuring step for measuring the coating film width or the coating film thickness;
A coating method comprising: a feedback step of moving the coating die with respect to the belt-like sheet in a direction different from the coating surface based on the measurement value of the measurement step. In the coating method according to claim 1,
The coating method characterized in that the distance between the coating die and the coating surface is changed based on the coating film width measured in the measuring step. In the coating method according to claim 1,
A coating method, wherein an inclination of the coating die with respect to the coating surface is changed based on the coating film thickness measured in the measuring step. In any one of the coating methods as described in Claim 1 thru | or 3,
Forming multiple coated surfaces simultaneously with multiple coating dies,
A coating method comprising: measuring a position of the coating film from the end face of the belt-like sheet, and individually moving the plurality of coating dies in the coating film width direction based on the measured value. In any one of the coating methods as described in Claim 1 thru | or 4,
The coating film width or the coating film thickness, and the coating film position are measured by scanning in the coating film width direction and measuring the distribution of the coating film thickness. Coating method. In the coating device that applies the paste material to the surface of the belt-like sheet with a coating die with a predetermined coating film width and a predetermined coating film thickness,
Measuring means for measuring the coating film width or the coating film thickness;
A coating apparatus comprising: a coating die moving unit that moves the coating die with respect to the belt-like sheet in a direction different from a coating surface based on a measurement value measured by the measuring unit. In the coating device according to claim 6,
A coating apparatus comprising: a control unit that changes the distance between the coating die and the coating surface based on the coating film width measured by the measuring unit. . In the coating device according to claim 6,
The coating apparatus, wherein the coating die moving means has control means for changing an inclination of the coating die with respect to the coating surface based on the coating film thickness measured by the measuring means. In any one of the coating apparatuses as described in Claim 6 thru | or 8,
A plurality of coating dies that simultaneously form a plurality of coated surfaces;
It has a control means for measuring the position of the coating film from the end face of the belt-like sheet, and individually moving the plurality of coating dies in the coating film width direction based on the measured value. Coating equipment.

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