JP2016131941A - Coating device and operation method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating device which can form a coating film of a uniform thickness in continuous intermittent coating.SOLUTION: A coating device forms a coating part 4 by discharging a coating liquid 8 from a tip end of a slit die 1 and forming a crosslinking of the coating liquid 8 in a clearance between a conveyed base material 3 and the tip end of the slit die 1, and coats the base material 3 with the coating liquid 8 through the coating liquid crosslinking. The coating device controls a first opening/closing two-way valve 6 so as to start supply of the coating liquid 8 to the clearance before a first predetermined time, when the slit die 1 reaches from a standby position to a coating position, passes, and controls the first opening/closing two-way valve 6 so as to stop the supply of the coating liquid 8 to the clearance after a second predetermined time passes after the slit die 1 starts moving from the coating position to the standby position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating apparatus that alternately repeats a coating portion and an uncoated portion with a predetermined length, and an operation method thereof.

  As a means for forming a new layer on the base material, there is a means for coating the base material with a coating liquid in which a material to be formed is dissolved or dispersed in a liquid. A portion where the layer is formed is referred to as a coated portion, and a portion where a base material not formed is exposed is referred to as an uncoated portion. Intermittent coating in which a coated portion and an uncoated portion are alternately repeated at a predetermined length may be used when producing fuel cell electrodes or lithium ion battery electrodes.

  As a coating method, there is a method using a slit die or a spray. In the coating method using a slit die, the distance between the slit die and the substrate is controlled from several tens of microns to several hundreds of microns, and the coating liquid discharged from the slit die is crosslinked between the slit die and the substrate. Is applied to the substrate.

  Compared with the spray coating method in which the coating liquid is scattered, the present method has an effect of reducing the cost when using an expensive coating liquid because the liquid feeding loss of the coating liquid is small. When intermittent coating is performed using this method, the state of crosslinking of the coating liquid between the slit die and the substrate is controlled, and the state of crosslinking the coating liquid and the state of not crosslinking are alternately repeated.

  Therefore, the supply amount of the coating liquid from the slit die and the distance (clearance) between the slit die and the substrate are controlled. When controlling the supply amount of the coating liquid, increase the supply amount of the coating liquid from the tip of the slit die to form the coating part, and from the tip of the slit die to form the uncoated part. Reduce the amount of coating solution supplied.

  Also, when controlling the clearance between the slit die and the base material, the clearance between the slit die and the base material is reduced to form a coated part, and the slit die and the base material are formed to form an uncoated part. Increase the clearance between. Intermittent coating can be performed by repeating such operations. By performing such intermittent coating, a coating pattern having a predetermined length can be formed.

  However, since the physical operation such as the flow of the coating liquid and the movement of the slit die is unsteady at the start end and the end end of the coating, compared to continuous coating, Intermittent coating in which the work part and the uncoated part are alternately repeated shortens the steady state time. On the other hand, it is required to control the thickness of the coated part from the start end to the end.

  For this reason, physical control is important at the start end of the coating start and the end end of the coating in an unsteady state. Therefore, in Patent Document 1, the coating start pressure of the application fluid is set higher than the normal discharge pressure, and when the specified pressure is reached, the coating liquid is supplied at the normal discharge pressure, and the coating liquid is applied at the end of the coating. A method for setting a negative pressure has been proposed. Patent Document 2 proposes a method for controlling the opening degree of a valve when discharging.

JP-A-2005-205268 JP 2014-79669 A

  However, in the configuration of Patent Document 1, a pressure detector is required to control the discharge pressure, the pressure operation is detected to control the pressure at the start and end of coating, and the operation of the pump Therefore, when the pressure operation is detected, the piping configuration becomes complicated and the error of the pressure sensor is included in the total liquid amount of the pump.

  Further, the behavior analysis of the pressure of the discharge coating liquid is complicated. In addition, there has been a problem that pressure may be affected by changes in the physical properties of the coating liquid. Therefore, it is a problem to construct a control system that simplifies them.

  Further, in the configuration of Patent Document 2, since a mechanism for controlling the supply amount of the paint by the opening degree of the valve is provided, such a control valve is increased in size and the loss of the coating liquid is increased. It was a problem. Therefore, it is a problem to construct an ink supply line that simplifies this.

  In the present invention, the cross-linking state of the coating liquid formed between the slit die and the base material can be stably formed in the same manner as in the steady state until the start of coating and the end of coating, which are unsteady. An object of the present invention is to provide a coating apparatus and a method for operating the same.

  In order to solve the above-described conventional problems, a coating apparatus of the present invention includes a slit die that discharges a coating liquid from a slit tip, a transport unit that transports a base material, and the slit die that is close to the base material. Moving means for moving between a coating position and a standby position away from the substrate, a coating liquid supply line for supplying a coating liquid to the slit die, and a coating liquid from the coating liquid supply line Supply adjustment means for adjusting the supply or stop of the liquid, and a controller for controlling the supply adjustment means, the coating liquid is discharged from the slit tip, to the clearance between the substrate to be conveyed and the slit tip A coating apparatus for forming a coating liquid bridge and applying the coating liquid to the substrate via the coating liquid bridge, wherein the controller is configured to cause the slit die to move from the standby position to the coating liquid. Before the first predetermined time arriving at the work position. And it controls the supply adjustment means so as to start the supply of the coating liquid to the clearance.

  With the above configuration, if the coating liquid is supplied to the clearance before arriving at the coating position, a liquid pool can be formed at the tip of the slit die, and the coating liquid bridge can be stably formed. Sometimes, it is possible to suppress a thinning of the catalyst layer at the start of coating and chipping of the shape of the start of coating. Therefore, a predetermined coating film can be stably formed on the substrate.

  Further, another coating apparatus of the present invention includes a slit die for discharging a coating liquid from a slit tip, a transport means for transporting a base material, a coating position in which the slit die is close to the base material, and the base. A moving means for moving between a standby position away from the material, a supply adjusting means for adjusting the supply or stop of the coating liquid to the slit die, and a controller for controlling the supply adjusting means, The coating liquid is discharged from the slit tip to form a coating liquid bridge in the clearance between the substrate to be conveyed and the slit tip, and the coating liquid is applied to the substrate via the coating liquid bridge. The controller stops the supply of the coating liquid to the clearance after a second predetermined time after the slit die starts moving from the coating position to the standby position. To control the supply adjusting means A.

With the above configuration, when the supply of the coating liquid to the clearance is stopped after the movement to the standby position is started, a liquid pool can be formed at the tip of the slit die, and at the start of the next coating, Thinning of the catalyst layer and chipping of the coating start end shape can be suppressed. Therefore, a predetermined coating film can be stably formed on the substrate.

  Furthermore, the operation method of the coating apparatus of the present invention is to discharge the coating liquid from the slit tip of the slit die, to form a bridge of the coating solution in the clearance between the substrate to be conveyed and the slit tip, An operation method of a coating apparatus for applying a coating liquid to the base material via a coating liquid bridge, wherein the slit die is moved from a standby position away from the base material to the slit die to the base material. The supply of the coating liquid to the clearance is started before the first predetermined time has arrived at the adjacent coating position.

  By supplying the coating liquid to the clearance before arriving at the coating position by the above operation method, a liquid pool can be formed at the tip of the slit die and the coating liquid bridge can be stably formed. At the start, thinning of the catalyst layer at the start of coating and chipping of the shape of the start of coating can be suppressed. Therefore, an intermittent coating film having a predetermined thickness can be stably formed on the substrate.

  Further, another operation method of the coating apparatus of the present invention is to discharge the coating liquid from the slit tip of the slit die and form a bridge of the coating solution in the clearance between the substrate to be conveyed and the slit tip. An operation method of a coating apparatus for applying a coating solution to the substrate via the coating solution crosslinking, wherein the slit die is separated from the substrate from a coating position close to the substrate. The supply of the coating liquid to the clearance is stopped after a second predetermined time from the start of the movement to the standby position.

  If the supply of the coating liquid to the clearance is stopped after starting the movement to the standby position by the above operation method, a liquid pool can be formed at the tip of the slit die, and at the start of the next coating, It is possible to suppress the thinning of the catalyst layer and chipping of the coating starting end shape. Therefore, an intermittent coating film having a predetermined thickness can be stably formed on the substrate.

  According to the present invention, the coating film formed between the slit die and the base material has a cross-linked state that is stable in the coating film thickness as in the steady state until the coating start and the coating end, which are unsteady. Can be formed.

Schematic sectional view schematically showing a coating apparatus according to Embodiment 1 of the present invention. Timing chart schematically showing a coating operation method according to Embodiment 1 of the present invention Schematic sectional view schematically showing a coating apparatus according to Embodiment 2 of the present invention. Timing chart schematically showing a coating operation method according to Embodiment 2 of the present invention Schematic sectional view schematically showing a coating apparatus according to Embodiment 3 of the present invention. Timing chart schematically showing a coating operation method according to Embodiment 3 of the present invention Schematic sectional view schematically showing a coating apparatus according to Modification 1 of the present invention Schematic sectional view schematically showing a coating apparatus according to Modification 2 of the present invention

The first invention includes a slit die for discharging a coating liquid from the slit tip, a transport means for transporting the base material, a coating position where the slit die is close to the base material, and a standby position away from the base material. Moving means for moving between, a coating liquid supply line for supplying a coating liquid to the slit die, a supply adjusting means for adjusting the supply or stop of the coating liquid from the coating liquid supply line, A controller for controlling the supply adjusting means, discharging a coating liquid from the slit tip, forming a bridge of the coating solution in the clearance between the substrate to be conveyed and the slit tip, and A coating apparatus for coating a coating liquid on the base material via cross-linking of the working liquid, wherein the controller is a first predetermined time before the slit die arrives at the coating position from the standby position. Start supplying coating liquid to the clearance Wherein controlling the supply adjusting means is a coating apparatus.

  With such a configuration, when intermittent coating is performed, the operation timing of the coating liquid supply adjusting means is controlled to reduce the loss of the coating liquid, so that the coating in an unsteady state is reduced. It is possible to provide a coating apparatus that can form a coating film thickness similar to that during coating in a steady state at the start end.

  In a second aspect of the invention, in particular, the controller in the first aspect of the invention provides a coating liquid to the clearance after a second predetermined time has elapsed since the slit die started moving from the coating position to the standby position. It is a coating apparatus which controls the said supply adjustment means so that supply of may be stopped.

  With such a configuration, when intermittent coating is performed, the operation timing of the coating liquid supply adjusting means is controlled, so that the coating start end portion and the coating end portion which are in an unsteady state are in a steady state. It is possible to provide a coating apparatus capable of forming the same coating film thickness as that during construction.

  A third invention includes a slit die for discharging the coating liquid from the slit tip, a transport means for transporting the base material, a coating position where the slit die is close to the base material, and a standby position apart from the base material. Moving means for moving between, a coating liquid supply line for supplying a coating liquid to the slit die, a supply adjusting means for adjusting the supply or stop of the coating liquid from the coating liquid supply line, A controller for controlling the supply adjusting means, discharging a coating liquid from the slit tip, forming a bridge of the coating solution in the clearance between the substrate to be conveyed and the slit tip, and A coating apparatus that applies a coating liquid to the base material via cross-linking of a working liquid, wherein the controller starts after the slit die starts moving from the coating position to the standby position. 2 After the predetermined time has elapsed, Controlling the supply adjustment means so as to stop feeding a coating apparatus.

  With this configuration, when intermittent coating is performed, the operation timing of the supply adjustment means for the coating liquid is controlled, so that the coating film similar to that during coating in the steady state is applied at the coating end point in the unsteady state. The coating apparatus which can form the thickness of can be provided.

  According to a fourth aspect of the present invention, the supply adjusting means in the first or second aspect of the invention includes a first on-off valve that is provided in the coating liquid supply line and opens and closes the coating liquid supply line. The coating device controls the opening operation of the first on-off valve so that the supply of the coating liquid to the clearance is started a first predetermined time before the slit die arrives at the coating position.

  With this configuration, when intermittent coating is performed, the operation timing of the valve that opens and closes is controlled so that the flow of ink is in a steady state at the coating start end and the coating end. The coating apparatus which can form the thickness of the same coating film as during coating can be provided.

  According to a fifth aspect of the invention, the supply adjusting means in the second or third aspect of the invention includes a first on-off valve that is provided in the coating liquid supply line and opens and closes the coating liquid supply line. The closing operation of the first on-off valve is controlled so that the supply of the coating liquid to the clearance is stopped after a second predetermined time after the slit die starts moving from the coating position to the standby position. It is a coating device.

  With this configuration, when intermittent coating is performed, the operation timing of the valve that opens and closes is controlled so that the flow of ink is in a steady state at the coating start end and the coating end. The coating apparatus which can form the thickness of the same coating film as during coating can be provided.

  According to a sixth aspect of the invention, the supply adjusting means in the first or second aspect of the invention includes a supply pump disposed in the coating liquid supply line, and the controller is configured so that the slit die is at the coating position. It is a coating apparatus which controls operation | movement of the said supply pump so that supply of the coating liquid to the said clearance may be started before the 1st predetermined time to arrive.

  With this configuration, when intermittent coating is performed, by controlling the operation timing of the supply pump, the coating flow in the steady state is applied to the coating start end portion and the coating end portion where the ink flow is unsteady. It is possible to provide a coating apparatus capable of forming the same coating film thickness as that during construction.

  According to a seventh aspect of the invention, the supply adjusting means in the second or third aspect of the invention includes a supply pump disposed in the coating liquid supply line, and the controller is configured so that the slit die is located at the coating position. A coating apparatus that controls the operation of the supply pump to stop the supply of the coating liquid to the clearance after a second predetermined time has elapsed since the movement to the standby position is started.

  With this configuration, when intermittent coating is performed, by controlling the operation timing of the supply pump, the coating flow in the steady state is applied to the coating start end portion and the coating end portion where the ink flow is unsteady. It is possible to provide a coating apparatus capable of forming the same coating film thickness as that during construction.

  The eighth invention is a coating apparatus comprising a coating liquid branch line that branches from the coating liquid supply line, particularly in the fourth or fifth invention.

  With this configuration, when intermittent coating is performed, the coating liquid branch line suppresses an increase in the hydraulic pressure of the coating liquid supply line, and the ink flow is unsteady by controlling the operation timing of the valve that opens and closes. It is possible to provide a coating apparatus that can form a coating film thickness similar to that during coating in a steady state at the coating start end and the coating end.

  According to a ninth aspect of the present invention, in the eighth aspect of the invention, the second aspect further includes a second on-off valve that is provided in the coating liquid branch line and opens and closes the coating liquid branch line, and the controller closes the first on-off valve. In the coating apparatus, the second on-off valve is controlled to open when operated, and the second on-off valve is controlled to close when opening the first on-off valve.

  With this configuration, when intermittent coating is performed, the operation timing of the second on-off valve provided in the coating liquid branch line is controlled to prevent the liquid pressure in the coating liquid supply line from increasing and to open and close. By controlling the operation timing of the first on-off valve, a coating film similar to that during coating in the steady state is applied to the coating start end and the coating end in which the ink flow is unsteady. A coating apparatus capable of forming a thickness can be provided.

  In a tenth aspect of the invention, the first on-off valve in the eighth aspect of the invention is a three-way valve that switches between the slit die side and the coating liquid branch line side of the coating liquid supply line, and the controller As the closing operation of the first on-off valve, the three-way valve is switched from the slit die side of the coating liquid supply line to the coating liquid branch line side, and as the opening operation of the first on-off valve, the three-way valve Is a coating device that controls to switch from the coating liquid branch line side to the slit die side of the coating liquid supply line.

  With this configuration, when intermittent coating is performed, the hydraulic pressure of the coating liquid supply line is controlled by controlling the operation timing of the three-way valve that switches between the slit die side and the coating liquid branch line side of the coating liquid supply line. It is possible to suppress the increase, and at the coating start end where the ink flow is in an unsteady state and the coating end portion, it is possible to form the same coating film thickness as during steady state coating. A coating apparatus can be provided.

  In an eleventh aspect of the invention, the coating liquid is discharged from the slit tip of the slit die to form a crosslinking of the coating liquid in the clearance between the substrate to be conveyed and the slit tip, and through the coating liquid crosslinking An operation method of a coating apparatus for applying a coating liquid to the substrate, wherein the slit die arrives at a coating position near the substrate from a standby position away from the substrate. This is a method of operating the coating apparatus that starts supplying the coating liquid to the clearance before the first predetermined time.

  When intermittent coating is performed by such an operation method, by controlling the operation of starting the supply of the coating liquid, at the coating start end where the ink flow is in an unsteady state, It is possible to provide a method of operating a coating apparatus that can form a similar coating film thickness.

  In a twelfth aspect of the invention, in particular, in the eleventh aspect of the invention, the supply of the coating liquid to the clearance is stopped after the second predetermined time has elapsed since the slit die started to move from the coating position to the standby position. This is a method of operating the coating apparatus.

  When intermittent coating is performed by such an operation method, by controlling the operation of starting the supply of the coating liquid, the coating start end portion in which the flow of ink is in an unsteady state, and the coating end portion, It is possible to provide a method for operating a coating apparatus that can form the same coating film thickness as that during coating in a steady state.

  In a thirteenth aspect of the invention, the coating liquid is discharged from the slit tip of the slit die to form a crosslinking of the coating liquid in the clearance between the substrate to be conveyed and the slit tip, and through the coating liquid crosslinking An operation method of a coating apparatus for applying a coating liquid to the base material, wherein the slit die starts to move from a coating position close to the base material to a standby position away from the base material. The operation method of the coating apparatus for stopping the supply of the coating liquid to the clearance after the second predetermined time has elapsed.

  When intermittent coating is performed by such an operation method, by controlling the operation of starting the supply of the coating liquid, at the coating end portion where the flow of ink is in an unsteady state, It is possible to provide a method of operating a coating apparatus that can form a similar coating film thickness.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment of the present invention.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view schematically showing a coating apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the coating apparatus according to the present embodiment has a slit that discharges the coating liquid 8 from the slit tip with the liquid surface position of the coating liquid tank 7 higher than the tip of the slit die 1. Slit die movement between die 1, conveying means for conveying substrate 3 in the direction of substrate movement direction 5, and slit die between coating position close to substrate 3 and standby position away from substrate 3 Moving means for moving in the direction 2, a coating liquid supply line 9 for supplying the coating liquid 8 from the coating liquid tank 7 to the slit die 1, and supply of the coating liquid 8 from the coating liquid supply line 9 Alternatively, a first open / close two-way valve 6 and a controller (not shown) for controlling the first open / close two-way valve 6 are provided as supply adjusting means for adjusting the stop.

  And the coating apparatus of this Embodiment discharges the coating liquid 8 from the front-end | tip of the slit die 1, and bridge | crosslinks the coating liquid 8 to the clearance between the conveyed base material 3 and the front-end | tip of the slit die 1. FIG. It is a coating apparatus which forms, forms the coating part 4, and applies the coating liquid 8 to the base material 3 through coating liquid bridge | crosslinking.

  The controller controls the first open / close two-way valve 6 so as to start supplying the coating liquid 8 to the clearance before the first predetermined time elapses when the slit die 1 arrives at the coating position from the standby position. Further, the controller controls the supply adjusting means so as to stop the supply of the coating liquid 8 to the clearance after the second predetermined time has elapsed since the slit die 1 started to move from the coating position to the standby position. .

  FIG. 2 is a timing chart schematically showing the operation method of the coating apparatus according to the first embodiment of the present invention.

  First, the description regarding the coating start end part 13 will be described. When the slit die 1 moves from the standby position where the slit die 1 is detached from the base material 3 to the coating position close to the base material 3, the controller moves the first opening and closing two directions at the operation timing of the broken line earlier than the operation timing of the solid line. The valve 6 is controlled to open from closed to open. By doing so, a large pool of the coating liquid 8 can be formed at the tip of the slit die 1.

  When the slit die 1 arrives at the coating position in a state where the pool of the coating liquid 8 is formed largely at the tip of the slit die 1, sufficient for coating between the tip of the slit die 1 and the substrate 3. Since the coating liquid 8 having a large size is cross-linked, the thickness of the film at the coating start end portion 13 formed with the coating liquid 8 can be increased, and defects such as chipping can be reduced. Can do.

  Next, the description regarding the coating termination | terminus part 14 is described. When the slit die 1 starts moving from the coating position close to the base material 3 to the standby position separated from the base material 3, the controller moves the first opening and closing two directions at the operation timing indicated by the broken line, which is later than the solid line operation timing. The valve 6 is controlled to close from open to closed.

  By doing so, the crosslinking of the coating liquid 8 between the tip of the slit die 1 and the substrate 3 is kept sufficiently large, so that the film thickness of the coating end portion 14 formed with the coating liquid 8 is increased. It is possible to increase the thickness and reduce defects such as chips.

  As described above, at the coating start end portion 13 and the coating end portion 14, the controller operates the first open / close two-way valve 6 for supplying the coating liquid 8 to the slit die 1, and the slit die 1 is on standby. The movement timing between the position and the coating position is controlled. By carrying out like this, the defect | deletion of the shape of the coating film of the coating start end part 13 and the coating termination | terminus terminal part 14 can be reduced, and a uniform coating film can be formed.

  Note that the standby position of the slit die 1 is the direction in which the tip of the slit die 1 is detached from the base material 3, and the distance between the slit die 1 and the base material 3 only needs to be a distance that cannot form a bridge. . In addition, the base 3 may be moved while the slit die 1 is fixed. Further, the operation method according to the first embodiment may be performed only on one of the coating start end portion 13 and the coating end portion 14.

  In addition, when the coating liquid 8 is supplied to the slit die 1 instead of the first open / close two-way valve 6, the liquid level of the coating liquid 8 in the coating liquid tank 7 is increased, and the coating liquid 8. Coating liquid by controlling the liquid surface height of the coating liquid 8 so as to lower the liquid surface height of the coating liquid 8 in the coating liquid tank 7 when the supply to the slit die 1 is stopped. Supply adjustment means may also be used.

(Embodiment 2)
FIG. 3 is a schematic cross-sectional view schematically showing a coating apparatus according to Embodiment 2 of the present invention. As shown in FIG. 3, the coating apparatus of the present embodiment includes a slit die 1 that discharges the coating liquid 8 from the slit tip, a transport unit that transports the base material 3 in the direction of the base material moving direction 5, Moving means for moving the slit die 1 in the direction of the slit die moving direction 2 between the coating position close to the substrate 3 and the standby position away from the substrate 3, and the slit die 1 from the coating liquid tank 7 A coating liquid supply line 9 for supplying the coating liquid 8, a supply pump 10 as a supply adjusting means for adjusting the supply or stop of the coating liquid 8 from the coating liquid supply line 9, and a control for controlling the supply pump 10 A vessel (not shown).

  And the coating apparatus of this Embodiment discharges the coating liquid 8 from the front-end | tip of the slit die 1, and bridge | crosslinks the coating liquid 8 to the clearance between the conveyed base material 3 and the front-end | tip of the slit die 1. FIG. It is a coating apparatus which forms, forms the coating part 4, and applies the coating liquid 8 to the base material 3 through coating liquid bridge | crosslinking.

  The controller controls the supply pump 10 to start supplying the coating liquid 8 to the clearance before the first predetermined time elapses when the slit die 1 arrives at the coating position from the standby position. Further, the controller controls the supply adjusting means so as to stop the supply of the coating liquid 8 to the clearance after the second predetermined time has elapsed since the slit die 1 started to move from the coating position to the standby position. .

  FIG. 4 is a timing chart schematically showing a coating operation method according to Embodiment 2 of the present invention.

  First, the description regarding the coating start end part 13 will be described. At the operation timing indicated by the broken line earlier than the operation timing indicated by the solid line when the slit die 1 starts moving from the standby position where the slit die 1 is detached from the base material 3 to the coating position close to the base material 3, the controller Control is performed to increase the amount of the working liquid 8 fed. By doing so, a large pool of the coating liquid 8 can be formed at the tip of the slit die 1.

  When the slit die 1 arrives at the coating position in a state where the pool of the coating liquid 8 is formed largely at the tip of the slit die 1, sufficient for coating between the tip of the slit die 1 and the substrate 3. Since the coating liquid 8 having a large size is cross-linked, the thickness of the film at the coating start end portion 13 formed with the coating liquid 8 can be increased, and defects such as chipping can be reduced. Can do.

  Next, the description regarding the coating termination | terminus part 14 is described. At the operation timing indicated by a broken line, which is slower than the operation timing indicated by a solid line, where the slit die 1 starts moving from the coating position close to the base material 3 to the standby position separated from the base material 3, the controller Control is performed so that the supply amount of the working liquid 8 is lowered.

  By doing so, the crosslinking of the coating liquid 8 between the tip of the slit die 1 and the substrate 3 is kept sufficiently large, so that the film thickness of the coating end portion 14 formed with the coating liquid 8 is increased. It is possible to increase the thickness and reduce defects such as chips.

  As described above, at the coating start end portion 13 and the coating end portion 14, the controller operates the supply pump 10 that supplies the coating liquid 8 to the slit die 1, and the slit die 1 is in the standby position and the coating position. The operation timing for moving between positions is controlled. By carrying out like this, the defect | deletion of the shape of the coating film of the coating start end part 13 and the coating termination | terminus terminal part 14 can be reduced, and a uniform coating film can be formed.

Note that the standby position of the slit die 1 is the direction in which the tip of the slit die 1 is detached from the base material 3, and the distance between the slit die 1 and the base material 3 only needs to be a distance that cannot form a bridge. In addition, the base 3 may be moved while the slit die 1 is fixed. The operation method according to the second embodiment may be performed only on one of the coating start end portion 13 and the coating end portion 14.

(Embodiment 3)
FIG. 5 is a schematic cross-sectional view schematically showing a coating apparatus according to Embodiment 3 of the present invention. As shown in FIG. 5, the coating apparatus of the present embodiment includes a slit die 1 that discharges the coating liquid 8 from the slit tip, a transport unit that transports the base material 3 in the direction of the base material moving direction 5, A moving means for moving the slit die 1 between the coating position close to the base material and the standby position away from the base material in the direction of the slit die moving direction 2, and coating the slit die 1 from the coating liquid tank 7 A coating liquid supply line 9 for supplying the liquid 8, a supply pump 10 as a supply adjusting means for adjusting the supply or stop of the coating liquid 8 from the coating liquid supply line 9, a first open / close two-way valve 6, A controller (not shown) for controlling the supply pump 10 and the first open / close two-way valve 6.

  And the coating apparatus of this Embodiment discharges the coating liquid 8 from a slit front-end | tip, forms the bridge | crosslinking of the coating liquid 8 in the clearance between the conveyed base material 3 and the front-end | tip of the slit die 1, It is a coating apparatus which forms the coating part 4 and applies the coating liquid 8 to the base material 3 through coating liquid bridge | crosslinking.

  Then, the controller controls the supply pump 10 to start supplying the coating liquid 8 to the clearance before the first predetermined time elapses when the slit die 1 arrives at the coating position from the standby position. Further, the controller controls the supply adjusting means so that the supply of the coating liquid 8 to the clearance is stopped after the second predetermined time has elapsed since the slit die started to move from the coating position to the standby position.

  FIG. 6 is a timing chart schematically showing a coating operation method according to Embodiment 3 of the present invention.

  First, the description regarding the coating start end part 13 will be described. At the operation timing indicated by the broken line earlier than the operation timing indicated by the solid line when the slit die 1 starts moving from the standby position where the slit die 1 is detached from the base material 3 to the coating position close to the base material 3, the controller Control is performed to increase the supply amount of the working fluid 8, and the first opening / closing two-way valve 6 is controlled from opening to closing. By doing so, a large pool of the coating liquid 8 can be formed at the tip of the slit die 1.

  When the slit die 1 arrives at the coating position in a state where the pool of the coating liquid 8 at the tip of the slit die 1 is formed large, it is sufficient for coating between the tip of the slit die 1 and the substrate 3. Since the coating liquid 8 having a large size is cross-linked, the thickness of the film at the coating start end portion 13 formed with the coating liquid 8 can be increased, and defects such as chipping can be reduced. Can do.

  Next, the description regarding the coating termination | terminus part 14 is described. At the operation timing indicated by a broken line, which is slower than the operation timing indicated by a solid line, where the slit die 1 starts moving from the coating position close to the base material 3 to the standby position separated from the base material 3, the controller The supply amount of the working fluid 8 is controlled to be lowered, and the first opening / closing two-way valve 6 is controlled to be closed from opening to closing.

  By doing so, the crosslinking of the coating liquid 8 between the tip of the slit die 1 and the substrate 3 is kept sufficiently large, so that the film thickness of the coating end portion 14 formed with the coating liquid 8 is increased. It is possible to increase the thickness and reduce defects such as chips.

  As described above, at the coating start end portion 13 and the coating end portion 14, the controller operates the first open / close two-way valve 6 for supplying the coating liquid 8 to the slit die 1 and the operation of the supply pump 10. The timing and the operation timing at which the slit die 1 moves between the standby position and the coating position are controlled.

  By carrying out like this, the defect | deletion of the shape of the coating film of the coating start end part 13 and the coating termination | terminus terminal part 14 can be reduced, and a uniform coating film can be formed. Note that the standby position of the slit die 1 is the direction in which the tip of the slit die 1 is detached from the base material 3, and the distance between the slit die 1 and the base material 3 may be a distance that cannot form a bridge.

  In addition, the base 3 may be moved while the slit die 1 is fixed. The operation method according to the third embodiment may be performed only on one of the coating start end portion 13 and the coating end portion 14. Further, the operation timing of the supply pump 10 and the first open / close two-way valve 6 is not necessarily the same timing, and either one may be the same timing as the timing when the slit die 1 starts to move.

(Modification 1)
The coating apparatus according to the first modification is different from the coating apparatus according to the third embodiment in that the supply liquid returns to the coating liquid tank from between the supply pump and the first open / close two-way valve. The coating device includes a line, a second open / close two-way valve in the coating liquid branch line, and a controller that controls the second open / close two-way valve.

  FIG. 7 is a schematic cross-sectional view schematically showing a coating apparatus according to Modification 1 of the present invention. As shown in FIG. 7, the coating apparatus according to the first modification includes a coating liquid branch line 15 from which the supply liquid returns to the coating liquid tank 7 from between the supply pump 10 and the first open / close two-way valve 6. The coating liquid branch line 15 includes a second open / close two-way valve 11.

  When the controller closes the first open / close two-way valve 6 from open to closed, the controller controls the second open / close two-way valve 11 to open from close to open. When the valve 6 is opened from closed to open, the second open / close two-way valve 11 is controlled to open from closed to closed.

  By doing so, even if the coating liquid 8 is continuously sent out from the supply pump 10, it is possible to reduce defects such as chipping at the coating start end portion 13 and the coating end portion 14. In addition, when the coating liquid is not supplied to the slit die 1, an increase in pressure between the first open / close two-way valve 6 and the supply pump 10 can be avoided, and the load on the supply pump 10 can be reduced. Can be reduced.

  As described above, at the coating start end portion 13 and the coating end portion 14, the controller controls the operation timing of the first open / close two-way valve 6 that supplies the coating liquid 8 to the slit die 1 and the second open / close two-way. The operation timing of the valve 11 and the operation timing at which the slit die 1 moves between the standby position and the coating position are controlled.

  By carrying out like this, the defect | deletion of the shape of the coating film of the coating start end part 13 and the coating termination | terminus terminal part 14 can be reduced, a uniform coating film is formed, and the coating liquid 8 is supplied to the slit die 1 When not applied, the load on the supply pump 10 can be reduced.

  The operation timings of the first open / close two-way valve 6 and the second open / close two-way valve 11 may be different. The second open / close two-way valve 11 may be a back pressure valve that opens and closes when the pressure rises, independently of the controller.

(Modification 2)
The coating apparatus according to the second modification is different from the coating apparatus according to the third embodiment in that the supply liquid returns to the coating liquid tank from the opening / closing three-way valve and the opening / closing three-way valve instead of the first opening / closing two-way valve. A coating apparatus includes a coating liquid branch line and a controller that controls an open / close three-way valve.

  FIG. 8 is a schematic cross-sectional view schematically showing a coating apparatus according to Modification 2 of the present invention. As shown in FIG. 8, the coating apparatus of Modification 2 includes a supply pump 10, an open / close three-way valve 12, and a coating liquid branch line 15 from which the supply liquid returns from the open / close three-way valve 12 to the coating liquid tank 7. .

  Further, the controller switches the open / close three-way valve 12 from the slit die 1 side of the coating liquid supply line 9 to the coating liquid branch line 15 side as the open / close three-way valve 12 closing operation. The open / close three-way valve 12 is controlled to be switched from the coating liquid branch line 15 side to the slit die 1 side of the coating liquid supply line 9.

  By doing so, even if the coating liquid 8 is continuously sent out from the supply pump 10, it is possible to reduce defects such as chipping at the coating start end portion 13 and the coating end portion 14. And the rise in the pressure between the open / close three-way valve 12 and the supply pump 10 can be avoided, and the load on the supply pump 10 can be reduced.

  As described above, at the coating start end portion 13 and the coating end portion 14, the controller controls the operation timing of the open / close three-way valve 12 that supplies the coating liquid 8 to the slit die 1, and the slit die 1 is moved to the standby position and the coating position. The operation timing for moving between the work positions is controlled.

  By carrying out like this, the defect | deletion of the shape of the coating film of the coating start end part 13 and the coating termination | terminus terminal part 14 can be reduced, a uniform coating film is formed, and the coating liquid 8 is supplied to the slit die 1 When not applied, the load on the supply pump 10 can be reduced.

  In addition, when switching the flow direction of the supply liquid of the open / close three-way valve 12, even when the open / close three-way valve 12 is controlled to increase the pressure of the supply liquid in the open / close three-way valve 12, the switching timing is different. Good.

  Since the present invention can form an intermittent coating film having a uniform film thickness, it can be applied to the production of fuel cell electrodes and lithium ion battery electrodes.

DESCRIPTION OF SYMBOLS 1 Slit die 2 Slit die moving direction 3 Base material 4 Coating part 5 Base material moving direction 6 First open / close two-way valve 7 Coating liquid tank 8 Coating liquid 9 Coating liquid supply line 10 Supply pump 11 Second opening / closing two Directional valve 12 Opening / closing three-way valve 13 Coating start end 14 Coating end 15 Coating liquid branch line

Claims (13)

A slit die for discharging the coating liquid from the slit tip;
Conveying means for conveying the substrate;
Moving means for moving the slit die between a coating position close to the substrate and a standby position away from the substrate;
A coating liquid supply line for supplying a coating liquid to the slit die;
Supply adjusting means for adjusting supply or stop of the coating liquid from the coating liquid supply line;
A controller for controlling the supply adjusting means;
With
The coating liquid is discharged from the slit tip to form a bridge of the coating liquid in the clearance between the substrate to be conveyed and the slit tip, and the coating liquid is applied to the substrate via the coating liquid bridge A coating device for coating,
The controller controls the supply adjusting means to start supplying the coating liquid to the clearance a first predetermined time before the slit die arrives at the coating position from the standby position;
Coating equipment.   The controller controls the supply adjusting means to stop the supply of the coating liquid to the clearance after a second predetermined time has elapsed since the slit die started to move from the coating position to the standby position. The coating apparatus according to claim 1 to be controlled. A slit die for discharging the coating liquid from the slit tip;
Conveying means for conveying the substrate;
Moving means for moving the slit die between a coating position close to the substrate and a standby position away from the substrate;
A coating liquid supply line for supplying a coating liquid to the slit die;
Supply adjusting means for adjusting supply or stop of the coating liquid from the coating liquid supply line;
A controller for controlling the supply adjusting means;
With
The coating liquid is discharged from the slit tip to form a bridge of the coating liquid in the clearance between the substrate to be conveyed and the slit tip, and the coating liquid is applied to the substrate via the coating liquid bridge A coating device for coating,
The controller controls the supply adjusting means to stop the supply of the coating liquid to the clearance after a second predetermined time has elapsed since the slit die started to move from the coating position to the standby position. Control,
Coating equipment. The supply adjusting means includes a first on-off valve that is provided in the coating liquid supply line and opens and closes the coating liquid supply line.
The controller controls the opening operation of the first on-off valve so as to start supplying the coating liquid to the clearance before a first predetermined time before the slit die arrives at the coating position. The coating apparatus according to 1 or 2. The supply adjusting means includes a first on-off valve that is provided in the coating liquid supply line and opens and closes the coating liquid supply line.
The controller controls the first on-off valve so that the supply of the coating liquid to the clearance is stopped after a second predetermined time after the slit die starts moving from the coating position to the standby position. The coating apparatus of Claim 2 or 3 which controls closing operation. The supply adjusting means includes a supply pump disposed in the coating liquid supply line,
The controller controls the operation of the supply pump so as to start supplying the coating liquid to the clearance before a first predetermined time before the slit die arrives at the coating position. The coating apparatus as described in. The supply adjusting means includes a supply pump disposed in the coating liquid supply line,
The controller operates the supply pump such that the supply of the coating liquid to the clearance is stopped after a second predetermined time has elapsed since the slit die started to move from the coating position to the standby position. The coating apparatus of Claim 2 or 3 which controls.   The coating apparatus of Claim 4 or 5 provided with the coating liquid branch line branched from the said coating liquid supply line. A second on-off valve provided in the coating liquid branch line for opening and closing the coating liquid branch line;
The controller controls to open the second on-off valve when closing the first on-off valve, and closes the second on-off valve when opening the first on-off valve. The coating apparatus according to claim 8 to be controlled. The first on-off valve is a three-way valve that switches between the slit die side and the coating liquid branch line side of the coating liquid supply line,
As the closing operation of the first on-off valve, the controller switches the three-way valve from the slit die side of the coating liquid supply line to the coating liquid branch line side, and opens the first on-off valve. The coating apparatus according to claim 8, wherein the three-way valve is controlled to be switched from the coating liquid branch line side to the slit die side of the coating liquid supply line. The coating liquid is discharged from the slit tip of the slit die to form a coating liquid bridge at the clearance between the substrate to be conveyed and the slit tip, and the coating is applied to the substrate via the coating liquid bridge. An operation method of a coating apparatus for applying a liquid,
The slit die starts supplying the coating liquid to the clearance a first predetermined time before the slit die arrives at a coating position close to the substrate from a standby position away from the substrate;
Operation method of coating equipment.   The operation of the coating apparatus according to claim 11, wherein the supply of the coating liquid to the clearance is stopped after a second predetermined time has elapsed since the slit die started to move from the coating position to the standby position. Method. The coating liquid is discharged from the slit tip of the slit die to form a coating liquid bridge at the clearance between the substrate to be conveyed and the slit tip, and the coating is applied to the substrate via the coating liquid bridge. An operation method of a coating apparatus for applying a liquid,
The slit die stops the supply of the coating liquid to the clearance after the second predetermined time has elapsed since the start of the movement from the coating position close to the substrate to the standby position away from the substrate.
Operation method of coating equipment.

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