JP5911771B2 - Intermittent application device - Google Patents

Description

  The present invention relates to an intermittent application apparatus that intermittently applies a coating liquid to a continuously running substrate, and in particular, intermittent application that is applied intermittently while supplying the coating liquid continuously without stopping. Relates to the device.

  As an intermittent application device that intermittently applies a coating liquid to a continuously running substrate, for example, by intermittently applying a coating liquid made of a positive electrode material or a negative electrode material onto a continuously supplied metal thin film sheet An intermittent coating apparatus for a lithium ion battery that forms a coating pattern composed of a coating region and a non-coating region having a predetermined length and width is known.

  Such an intermittent coating apparatus includes a die for extruding the coating liquid, a storage tank for storing the coating liquid, a supply means such as a pump for supplying the stored coating liquid to the die, and a flow path from the supply means to the die. And a switching means such as a valve for intermittently switching between supply and stop of the coating liquid to the die by opening and closing the flow path, and supplying and stopping the coating liquid by controlling the opening and closing of the switching means Are alternately performed to form a coating pattern on the substrate (for example, Patent Documents 1 and 2).

Further, in performing such intermittent application, since the application liquid has viscosity, when the supply of the application liquid is stopped, the application liquid in the vicinity of the discharge port of the die is pulled to the traveling substrate, and the end portion of the application area In some cases, drag marks of the coating liquid may be formed.
Therefore, the intermittent coating apparatus described in Patent Documents 1 and 2 includes a cylinder that receives the coating liquid in the die and a piston that operates when the supply of the coating liquid is stopped, and operates the piston when the supply of the coating liquid stops. By drawing the coating liquid into the cylinder, the coating liquid in the vicinity of the discharge port is pulled back into the die to prevent the occurrence of drag marks, thereby forming a linear coating region end.

Japanese Patent No. 2842347 Japanese Patent No. 3491196

However, the conventional intermittent coating apparatus has the following problems.
For example, when the supply of the coating liquid is stopped, the switching means such as a valve is closed to stop the supply to the die, but unless the supply means such as a pump is stopped, in the flow path from the supply means to the switching means The pressure of the coating liquid will increase. As a result, when the switching means is opened and supply of the coating liquid to the die is started, the coating film may become too thick because high-pressure coating liquid is ejected.
In order to prevent such thick coating, in the intermittent coating apparatus described in Patent Literatures 1 and 2, when the supply of the coating liquid is stopped, the coating liquid is switched by switching the flow path of the coating liquid simultaneously with the closing operation of the switching unit. The increase in pressure is avoided by reducing to the above.

However, in such an intermittent application apparatus, in addition to the opening / closing operation of the switching means, intermittent application must be performed while synchronizing the pulling / pushing operation of the piston. A complicated process for controlling the vehicle is required, and fine adjustments have to be made before reaching a good operating state.
Furthermore, when there are many movable parts such as pistons and switching means, there is a problem that maintenance work becomes complicated.
In addition, when the switching means is closed, it is necessary to provide a reduction flow path for returning the coating liquid to the storage tank. Therefore, the intermittent coating apparatus itself has to be enlarged to save space.

  In order to solve the problems as described above, the inventors of the present invention, as a result of diligent research, provided a base material for continuous running without providing a switching means such as a valve or a reducing flow path for returning the coating liquid to the storage tank. The inventors have arrived at the intermittent coating apparatus of the present invention capable of intermittently applying a coating solution.

  That is, the present invention is proposed in order to solve the problems of the current technology as described above, and more than the amount of coating liquid supplied per unit time from the supply means during the retracting operation of the piston. By providing a receiving chamber that can receive the same per unit time, the opening and closing operation by the switching unit is not performed, and the reduction channel for returning the coating liquid to the storage tank or the like is not provided. An object of the present invention is to provide an intermittent coating apparatus capable of intermittently applying a coating solution to a traveling substrate while continuously supplying the coating solution to the substrate.

  In order to achieve the above object, an intermittent coating apparatus of the present invention is an intermittent coating apparatus that intermittently applies a coating liquid supplied from a predetermined supply means to a traveling substrate, and discharges the coating liquid. A slit having an outlet at the tip and serving as a flow path for the coating liquid supplied from the supply means, a receiving chamber communicating with the slit and receiving the coating liquid in the slit, and the receiving chamber as a cylinder. And a piston that alternately performs a pull-in operation for drawing the coating liquid in the slit into the receiving chamber and a pushing-back operation for pushing the drawn coating liquid back into the slit, and the receiving chamber is in the pull-in operation. , Receiving an amount of the coating liquid supplied from the supply means per unit time or more per unit time, thereby stopping the discharge of the coating liquid from the discharge port, It is constituted to form a non-coating region which is not fabric.

  According to the intermittent coating apparatus of the present invention, it is possible to intermittently apply the coating liquid to the traveling substrate while reducing the size of the entire apparatus without performing complicated control.

It is a schematic perspective view which shows the intermittent application apparatus which concerns on one Embodiment of this invention. It is sectional drawing which showed typically the internal structure of the intermittent application apparatus which concerns on one Embodiment of this invention. It is sectional drawing which showed typically the intermittent application | coating operation | movement of the intermittent application apparatus which concerns on one Embodiment of this invention, (a) is a figure when a piston adjoins the slit most, (b) is a piston. FIG. 4 is a view when the most spaced from the slit.

  Hereinafter, a preferred embodiment of an intermittent coating apparatus according to the present invention will be described with reference to FIGS.

As shown in the drawings, the intermittent coating apparatus 1 according to the present embodiment includes a die 10 that extrudes a coating liquid, a transport roll 18 that transports the base material 20, a storage tank (not shown) that stores the coating liquid, and a storage tank. Supply means such as a pump (not shown) that supplies the coating liquid stored in the die 10 to the die 10, and is configured as an intermittent coating apparatus that intermittently applies the coating liquid to the continuously running substrate 20, for example, The region covered with the coating liquid by applying a coating liquid made of a positive electrode material (for example, lithium cobaltate) or a negative electrode material (for example, carbon) on a metal thin film sheet such as copper or aluminum as the base material 20 Intermittent coating for producing an electrode foil for a lithium ion battery in which a coating pattern having a coating region 21 made of a non-coating region 22 made of an exposed region of the base material 20 is formed It is configured as a device.
Further, the intermittent coating apparatus 1 does not control the supply unit on / off (supply / supply stop), or without providing a switching unit such as a valve that can switch between supply and stop of the coating liquid to the die 10. While the coating solution is continuously supplied from the supply means to the die 10, the coating solution can be applied intermittently.
Hereinafter, the configuration of each part of the intermittent coating apparatus 1 will be described.

  The transport roll 18 is made of, for example, a stainless steel roll formed in a cylindrical shape, and receives the power from a driving unit such as a motor and rotates around a support shaft to thereby wrap the wound base material 20. It is conveyed in the direction c in FIG.

The die 10 has a substantially rectangular parallelepiped outer shape, temporarily stores the coating liquid supplied from the supply means via the supply pipe 15, and has a discharge port formed on a surface facing the transport roll 18. 11a is configured to extrude the stored coating liquid toward the substrate 20.
Specifically, the die 10 is supplied through the supply pipe 15, the slit 11 communicating with the supply pipe 15, the discharge port 11 a formed at the tip of the slit 11 and opening toward the transport roll 18, and the supply pipe 15. A manifold 14 for temporarily storing liquid on the front side of the slit 11, an air vent pipe 16 for releasing air (gas) accumulated in the manifold to the outside of the machine, a valve 16a for opening and closing the pressure in the manifold in an adjustable manner, A receiving chamber 12 having an internal space communicating with the slit 11 and capable of receiving a predetermined amount of coating liquid staying in the slit 11, a piston 13 operating while using the receiving chamber 12 as a cylinder, and driving the piston 13 And a lifting device 17 composed of a motor or the like.

The discharge port 11a is located at the front end of the slit 11 and is disposed opposite to the transport roll 18, and has a gap in the height direction that defines the thickness of the coating film and a width Wt orthogonal to the running direction c of the substrate 20. The rectangular opening has a coating solution that can be discharged toward the substrate 20.
The thickness of the coating film covering the coating region 21 is determined by the gap between the discharge ports 11a, the conveyance speed of the substrate 20, the viscosity of the coating solution, and the width W1 of the coating region 21 is the opening width of the discharge port 11a. The value is almost the same as the width Wt.

The slit 11 has a gap that is the same as or larger than the gap of the discharge port 11a, and a width W that is the same as or wider than the width Wt of the discharge port 11a, and the cross-sectional shape along the width direction extends the width direction. It is formed in a rectangular shape as a side, and is formed as a flow path for gradually equalizing the coating liquid accumulated in the manifold 14 into a thin film as it approaches the discharge port 11a.
Further, the slit 11 of the present embodiment is formed to extend in the horizontal direction of the coating liquid.

The receiving chamber 12 has an internal space with one side having a width W that is substantially the same as the width of the slit 11, and is continuously formed at least in the width direction so as to be able to receive the coating liquid in the slit 11. . The continuous passage of the receiving chamber 12 to the slit 11 means that the receiving chamber 12 smoothly passes through an arc or a taper without forming a step having a corner at the boundary between the receiving chamber 12 and the slit 11.
The receiving chamber 12 of the present embodiment is formed so that the cross-sectional shape along the width direction has a rectangular shape with the width of the slit 11 as one side and is orthogonal to the slit 11.

The piston 13 is formed in a cross-sectional shape corresponding to the rectangular shape of the receiving chamber 12, that is, a flat plate having substantially the same width W as the receiving chamber 12, so that the entire internal space of the receiving chamber 12 is used as a cylinder as it is. In operation, the drawing operation for drawing the coating solution in the slit 11 into the internal space and the pushing-back operation for pushing the drawn coating solution back into the slit 11 are alternately performed.
This pull-in / push-back operation is realized by the lifting device 17 lifting and lowering the piston 13 in the vertical direction, and the lifting and lowering device 17 lifting the piston 13 in the a direction is called a pulling operation, and the lifting device 17 is in the b direction. The operation of lowering the piston 13 is called push-back operation.

By the cooperation of the receiving chamber 12 and the piston 13 having such a configuration, intermittent application to the base material 20 is realized as follows.
For example, as shown in FIG. 3A, when the piston 13 is positioned at the lowest position when it is closest to the slit 11, the coating liquid continuously flowing into the slit 11 via the manifold 14 is discharged to the discharge port 11a. As shown in FIG. 1, a coating region 21 is formed over the length L1 along the traveling direction on the base material 20 that continuously travels during this time. That is, the period during which the piston 13 is positioned at the lowermost portion can be set as the application region forming period.

On the other hand, as shown in FIG. 3B, in the pull-in operation in which the piston 13 moves in the direction a and sucks the coating liquid in the slit 11, the non-coating region 22 is formed on the base material 20 as shown below. Will be formed.
Specifically, the receiving chamber 12 is configured to receive a coating liquid of an amount or more supplied per unit time from the supply unit during the same operation time when the piston 13 is retracted.
For example, assuming that a constant amount of coating liquid is supplied to the die 10 from the supply means at a substantially constant flow rate, the piston 13 starts moving in the direction a, and then the speed is increased. When an amount of coating liquid that is greater than or equal to the amount supplied begins to be drawn into the receiving chamber 12, the coating liquid corresponding to the amount supplied from the supply means is drawn into the receiving chamber 12 as it is, so that the coating liquid from the discharge port 11a is used. Will stop discharging. From this timing, the non-application region 22 starts to be formed on the substrate 20, and as long as this state continues, as shown in FIG. 1, the non-application region 22 continues to be formed on the continuously running substrate 20. be able to.
That is, the non-application region 22 is formed by receiving the coating liquid in an amount equal to or larger than the amount supplied per unit time (for example, 1 second) by the receiving chamber 12 from the supply unit per unit time (for example, 1 second). The length L2 along the traveling direction of the non-application area 22 is proportional to the product of the unit time and the reception time (retraction time).
In this way, when the piston 13 is retracted, the receiving chamber 12 receives more than the amount of coating liquid supplied per unit time from the supply means per unit time, so that the coating liquid from the discharge port 11a is received. Discharging is stopped and the non-application area | region 22 in which a coating liquid is not apply | coated to the base material 20 can be formed.
In other words, in a state in which the receiving chamber 12 cannot accept more than the amount of coating liquid supplied from the supply means per unit time in the same unit time, for example, in the case of receiving less than the supplied amount, the discharge port 11a. Then, the coating liquid is discharged, and a coating region 21 where the coating liquid is applied is formed on the substrate 20.

In addition, in order to receive the coating liquid more than the quantity which the receiving chamber 12 supplies per unit time from a supply means per unit time, the cross-sectional area of the receiving chamber 12 (cross-sectional area of a direction orthogonal to ab direction). And the product of the moving speed of the piston 13 in the direction a during the pull-in operation can be realized by setting the product to be greater than or equal to the amount supplied per unit time from the supply means.
That is, by setting (designing) the cross-sectional area of the receiving chamber 12 and / or the moving speed of the piston 13 to a value that can draw the coating liquid that is more than the amount (flow rate) supplied per unit time from the supply means. The receiving chamber 12 can receive more coating liquid than the amount supplied per unit time from the supply means per unit time.

Furthermore, the end portion of the application region 21 can be formed into a clean linear shape by this drawing operation.
This is because the coating liquid in the vicinity of the discharge port 11 a is also drawn into the slit 11 by this drawing operation.
That is, at the start of the formation of the non-application area 22, the viscous application liquid is pulled toward the traveling substrate, but is also pulled toward the slit 11, so that the application liquid is cut off, Generation of drag marks is suppressed.
In particular, the receiving chamber 12 has an internal space with one side having a width W that is substantially the same as the width of the slit 11 and continuously communicates with the slit 11 at least in the width direction. Since the slits 11 are evenly drawn in the width direction, the terminal portion of the application region 21 is a clean straight line.
In this drawing operation, the receiving chamber 12 receives an amount that is equal to or larger than the amount supplied per unit time from the supply means, and it is preferable to receive a coating liquid exceeding this amount per unit time. This is for reliably drawing not only the amount of the coating liquid supplied from the supply means per unit time but also the coating liquid in the vicinity of the discharge port 11 a into the slit 11.

The receiving chamber 12 has at least a volume capable of receiving the coating liquid corresponding to the amount supplied from the supply means during the drawing operation, so that the receiving chamber 12 supplies the unit per unit time during the drawing operation. An amount of coating liquid supplied from the supply means is drawn (accepted) while the drawing operation is being performed while receiving an amount of coating liquid larger than a given amount per unit time.
The period during which the pull-in operation is performed means that the piston 13 located at the lowermost part starts to move up and moves to the uppermost part when it is farthest from the slit 11 and then starts to descend. can do.

  Thereby, since the coating liquid corresponding to the amount supplied from the supply means during the drawing operation can be stopped in the die 10, the discharge of the coating liquid from the discharge port 11a is stopped during this period, As shown in FIG. 1, the non-application area | region 22 is formed in the base material 20 which carries out continuous driving | running | working over the length L2 along a driving | running | working direction.

The receiving chamber 12 has a piston 13 positioned at the top in addition to the coating liquid corresponding to the amount supplied from the supply means during the retraction operation during the retraction operation and the retraction operation of the piston 13. It is also possible to draw in the coating liquid corresponding to the amount supplied from the supply means until it moves down and moves to the lowest part, that is, during the push-back operation.
Thereby, the application liquid corresponding to the amount supplied from the supply means during the pull-in operation and during the push-back operation, that is, from the start of the pull-in operation to the end of the push-back operation is put into the die 10. Since it can be stopped, the discharge of the coating liquid from the discharge port 11a is stopped at least during this period. Therefore, the base material 20 that continuously travels during this time has a non-application region 22 over the length L2 along the traveling direction. Will be formed.

  Note that the length L2 of the non-application area 22 is proportional to the time from the start of the formation of the non-application area 22 to the end of the drawing operation or the end of the push-back operation. By changing the length L2, the length L2 of the non-application area 22 can also be adjusted. For example, if the rotation speed during this period is slowed, the length L2 of the non-application area 22 is shortened, and if the rotation speed is fast, it can be lengthened.

Next, in the operation in which the piston 13 located at the uppermost portion moves in the direction b and moves to the lowermost portion, that is, in the push-back operation for pushing back the coating liquid drawn into the receiving chamber 12 into the slit 11, as shown below. The initial stage of formation of the application region 21 changes according to the amount of the application liquid received by the receiving chamber 12 during the drawing operation.
Specifically, when the receiving chamber 12 receives a coating liquid corresponding to the amount supplied from the supply means during the pulling operation during the pulling operation, the coating region 21 is started after the start of the pushing back operation. The formation of will begin.
On the other hand, at the time of and during the push-back operation receiving chamber 12 is retracted operation, a coating solution corresponding to the amount supplied from the supply means while being subjected to the pull-in operation is supplied from the supply means while being subjected to the push-back operation In the case where a coating liquid corresponding to a predetermined amount is received, the formation of the coating region 21 starts after the end of the push-back operation.
Hereinafter, each case will be described.

When the receiving chamber 12 receives the coating liquid corresponding to the amount supplied from the supply means during the pulling operation during the pulling operation, the piston 13 is moved in the b direction after the start of the pushing back operation. Immediately after the movement is started, the formation of the coating region 21 starts.
This is because immediately after the start of the push-back operation, the receiving chamber 12 is already filled with a coating liquid corresponding to the amount supplied from the supply means during the pull-in operation, and the die 10 including the manifold 14 is included. This is because the interior space is filled with the coating solution, and the coating solution is continuously supplied from the supply means.
That is, when the receiving chamber 12 receives the coating liquid corresponding to the amount supplied from the supply means during the pulling operation during the pulling operation, all the internal space of the die 10 is coated immediately after the start of the push-back operation. Since the application liquid is filled with the liquid and the application liquid can be discharged from the discharge port 11a only with the supply pressure from the supply means, the formation of the application region 21 starts immediately after the piston 13 starts moving in the b direction. become.

Further, at this time, immediately after the start of the push-back operation, the interior space of the die 10 is completely filled with the coating liquid, so that the coating liquid in the slit 11 is caused by the movement of the piston 13 in the b direction. The pressing force and the supply pressure from the supply means are applied.
Then, the movement of the piston 13 in the direction b increases the pressure of the coating liquid in the slit 11, and the fluctuation of the pressure at this time causes the amount of the coating liquid discharged from the discharge port 11a to fluctuate. become.
Therefore, the moving speed of the piston 13 in the b direction is preferably a constant speed from the uppermost part to the lowermost part in order to minimize the pressure fluctuation of the coating liquid in the slit 11.

Further, when the piston 13 reaches the lowermost part (see FIG. 3A), the application liquid in the slit 11 is not applied with the pressing force from the piston 13 but only the supply pressure from the supply means. . As a result, the pressure applied to the coating liquid in the slit 11 changes between when the push-back operation is performed and when the piston 13 is positioned at the lowermost position. When the coating region 21 is formed across the states, a difference in thickness is caused in the coating film.
Therefore, the application liquid is discharged while the piston 13 moves from the uppermost part to the lowermost part, that is, during the push-back operation, without setting the application region forming period while the piston 13 is positioned at the lowest part. It can also be set as the application area | region formation period which discharges from the exit 11a and forms the application area | region 21. FIG.
As a result, while the push-back operation is performed, the application region 21 that is thick and thin can be formed by maintaining the supply pressure by the supply means and the pressing force by the piston 13 at a constant pressure.

As described above, when the receiving chamber 12 receives the coating liquid corresponding to the amount supplied from the supply means during the drawing operation of the piston 13, the discharge port starts from the start of the push-back operation. As shown in FIG. 1, as shown in FIG. 1, a coating region 21 is formed over a length L <b> 1 along the running direction on the base material 20 that discharges the coating liquid from 11 a and continuously runs from the start to the end of the push-back operation. can do.
Further, the receiving chamber 12 is formed to have substantially the same width as that of the slit 11 and is continuously communicated with the slit 11 at least in the width direction. Thus, the pressure is evenly transmitted to the coating solution in 11.
As a result, since the pressure (positive pressure) applied to the coating liquid in the vicinity of the discharge port 11a is uniform across the width direction, the start end portion of the coating region 21 corresponding to the start of discharge can be made linear.

On the other hand, at the time of and during the push-back operation receiving chamber 12 is retracted operation, a coating solution corresponding to the amount supplied from the supply means while being subjected to the pull-in operation is supplied from the supply means while being subjected to the push-back operation When the coating liquid corresponding to the amount to be received is received, the formation of the coating region 21 starts after the end of the push-back operation.
This is a state in which the internal space of the die 10 is not yet filled with the coating liquid and the supply from the supply means is waiting while the push-back operation is performed, and the piston 13 moves to the lowermost part. This is because the inner space of the die 10 is filled with the coating liquid only when the push-back operation is completed.
In other words, during the time and push-back operation receiving chamber 12 is retracted operation, a coating solution corresponding to the amount supplied from the supply means while being subjected to the pull-in operation is supplied from the supply means while being subjected to the push-back operation When a coating liquid corresponding to a predetermined amount is received, a space that is not filled with the coating liquid remains in the die 10 until the pushing-back operation is completed. This is the end of the coating region forming period.

At the end of this pushing back operation, the piston 13 is positioned at the lowermost position, so that the pressing force from the piston 13 is not applied to the coating liquid in the slit 11 but only the supply pressure from the supplying means is applied. The coating liquid is discharged from the discharge port 11a by the pressure from the supply means, and the coating region 21 is formed on the substrate 20 that continuously runs. That is, as described above, the time when the piston 13 is located at the lowest position closest to the slit 11 (see FIG. 3A) can be set as the application region forming period.
As a result, while the piston 13 is positioned at the lowermost portion, the application pressure 21 by the supply means is maintained at a constant pressure, whereby the coating region 21 with no thickness unevenness can be formed.

As described above, during the retraction operation and the retraction operation of the piston 13, the coating liquid corresponding to the amount supplied from the supply means while the receiving chamber 12 is performing the retraction operation and the retraction operation are performed. When the coating liquid corresponding to the amount supplied from the supply means is received, the coating liquid is discharged from the discharge port 11a after the end of the pushback operation, and the drawing operation is started after the end of the pushback operation (exactly 1, when the substrate 20 continuously travels until a coating liquid larger than the amount supplied per unit time from the supply means starts to be drawn into the receiving chamber 12, as shown in FIG. The coating region 21 can be formed over the length L1 along the direction.
Even in this case, the movement of the piston 13 in the direction b increases the pressure of the coating liquid in the slit 11, and a sudden change in pressure causes the coating liquid to be discharged from the discharge port 11a. Therefore, the movement of the piston 13 in the direction b is preferably at a constant speed from the uppermost part to the lowermost part in order to minimize the pressure fluctuation of the coating liquid in the slit 11.

  As described above, according to the intermittent application device 1 of the present embodiment, since intermittent application is realized only by the pull-in operation and the push-back operation of the piston 13, it is not necessary to perform complicated control. Further, since the coating liquid is not returned to the storage tank, the coating liquid can be intermittently applied to the traveling substrate while reducing the size of the entire apparatus.

  As mentioned above, although preferred embodiment of the intermittent application apparatus of this invention was described, the intermittent application apparatus which concerns on this invention is not limited only to embodiment mentioned above, A various change implementation is possible in the scope of the present invention. Needless to say.

  For example, by configuring the valve 16a as an electromagnetic valve so that it can be opened and closed, when the piston 13 is performing a retraction operation and / or a push-back operation, the valve 16a is controlled to open or close, for example, When the piston 13 is retracted, the closing control is performed, and when the piston 13 is pushed back, the opening control is performed, whereby the pressure fluctuation of the coating liquid in the slit 11 can be suppressed.

Further, the piston 13 can be operated while controlling the flow rate from the supply means (for example, PWM control of the pump) without stopping the supply means such as a pump.
Further, the elevating device 17 can be controlled by a computer so that the ascending and descending speeds can be adjusted, for example, by making the ascending speed faster than the descending speed.
In addition, the rotational speed of the transport roll 18 can be adjusted in accordance with the operation and position of the piston 13 by providing a computer capable of interlocking control of the elevating device 17 and a driving means such as a motor for driving the transport roll 18. it can. Thereby, as described above, the length L1 of the application region 21, the length L2 of the non-application region 22, and the like can be adjusted.

Moreover, in the intermittent coating apparatus 1 of this embodiment, although the slit 11 extended and formed in the horizontal direction, it can also be extended and formed in the perpendicular | vertical direction or other direction.
In addition, although the direction of the receiving chamber 12 that intersects with the slit 11 changes as the extension direction of the slit 11 changes, the slit 11 and the receiving chamber 12 do not necessarily have to be orthogonal.
Further, the length (gap) along the traveling direction of the base material 20 of the receiving chamber 12 is preferably equal to or longer than the gap of the slit 11. Moreover, it is preferable that the receiving chamber 12 leads continuously to the slit 11 in the length direction along the traveling direction.

Further, the width of the receiving chamber 12 of the present embodiment is substantially the same as the width of the slit 11 perpendicular to the substrate traveling direction, but may be wider than this. Even in this case, in order to suck the coating liquid in the slit 11 evenly, the receiving chamber 12 communicates with the slit 11 continuously (without having a step) at least in the width direction (the width gradually increases). For example, the connecting portion between the slit 11 and the receiving chamber 12 is preferably configured in a mortar shape or a funnel shape.
Moreover, the cross-sectional shape along the width direction of the receiving chamber 12 is not limited to a rectangular shape, and may be a round shape, an elliptical shape, or a polygonal shape, and it goes without saying that the shape of the piston 13 changes according to this shape. .

  INDUSTRIAL APPLICATION This invention can be utilized for the intermittent application apparatus which apply | coats a coating liquid intermittently to the base material which runs continuously.

DESCRIPTION OF SYMBOLS 1 Intermittent coating apparatus 10 Die 11 Slit 11a Discharge port 12 Receiving chamber 13 Piston 14 Manifold 15 Supply pipe 16 Air vent pipe 17 Lifting apparatus 18 Transport roll 20 Base material 21 Application area 22 Non-application area

Claims (4)

An intermittent application device that intermittently applies a coating liquid supplied from a predetermined supply means to a traveling substrate,
A slit that serves as a flow path for the coating liquid supplied from the supply means, having a discharge port for discharging the coating liquid at the tip portion;
A receiving chamber that communicates with the slit and receives the coating liquid in the slit;
It operates while using the receiving chamber as a cylinder, and includes a piston that alternately performs a drawing operation that draws the coating liquid in the slit into the receiving chamber and a push-back operation that pushes the drawn coating liquid back into the slit,
The receiving chamber is in the retracting operation,
Receiving a coating liquid in an amount more than the amount supplied per unit time from the supply means per unit time;
By this reception, the discharge of the coating liquid from the discharge port is stopped, and a non-coating region where the coating liquid is not applied is formed on the substrate ,
The receiving chamber is
An intermittent coating apparatus characterized by having an internal space having a width equal to or larger than a width perpendicular to the substrate running direction of the slit and continuously leading to the slit at least in the width direction . The receiving chamber is in the retracting operation,
Receiving a coating liquid corresponding to the amount supplied from the supply means during the drawing operation;
2. The intermittent coating apparatus according to claim 1 , wherein after the push-back operation starts, the coating liquid is discharged from the discharge port to form a coating region where the coating liquid is applied to the base material. The receiving chamber is at the time of the retracting operation and the pushing back operation ,
Receiving a coating liquid corresponding to the amount supplied from the supply means during the pull-in operation and a coating liquid corresponding to the amount supplied from the supply means during the push-back operation;
2. The intermittent coating apparatus according to claim 1 , wherein after the pushing-back operation is finished, the coating liquid is ejected from the ejection port to form a coating area where the coating liquid is coated on the substrate. The slit has a rectangular shape in which the cross-sectional shape along the width direction has a long side in the width direction,
The receiving chamber has a rectangular shape in which the cross-sectional shape along the width direction has the long side as one side,
The intermittent application device according to any one of claims 1 to 3 , wherein the piston has a cross-sectional shape corresponding to a rectangular shape of the receiving chamber.

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