Slot die coater

Abstract

The present invention relates to a slot die coater, which supplies a constant-temperature medium to the inside of a slot die part to keep the temperature of a lip portion of the slot die part constant, and which, by forcibly changing the displacement of the center portion of the slot die part, adjusts horizontal displacement of the lip portion of the slot die part, thereby enabling uniform coating of a coating solution.

Description

Slot die coater

[0001] The present invention relates to a slot die coater.

[0002] More specifically, the present invention relates to a slot die coater that supplies a constant temperature medium to the inside of a slot die portion to keep the temperature of the lip portion of the slot die portion constant, and forcibly changes the displacement of the center of the slot die portion to control the horizontal displacement of the lip portion of the slot die portion.

[0003] With technological advancements and growing demand for mobile devices, demand for secondary batteries is also rapidly increasing. Among these, lithium secondary batteries are widely used as a power source for various mobile devices and other electronic products due to their high energy density, high operating voltage, and excellent storage and lifespan characteristics.

[0004] As the application fields of secondary batteries expand, the demand for higher-capacity secondary batteries is rapidly increasing. Research is being conducted on technologies that increase the loading of electrode mixture layers to increase the capacity of secondary batteries. Secondary battery electrodes are manufactured by coating electrode slurry on a current collector (11), followed by drying and rolling processes. However, to increase the loading of the electrode mixture layer, a large amount of electrode slurry must be coated on the current collector (11). To increase the coating amount of electrode slurry, a higher level of coating uniformity is required.

[0005] Figure 1 is a perspective view illustrating a conventional electrode slurry coating system.

[0006] Referring to Fig. 1, the electrode slurry slot die (20) discharges electrode slurry onto a current collector (11) passing through a coating roll (10) that rotates in one direction (R). Specifically, the current collector (11) is transported in the MD (Mechanical Direction) direction (F) while passing through the coating roll (10) that rotates in one direction (R). The electrode slurry slot die section (20) discharges electrode slurry onto the current collector (11) through the electrode slurry discharge section (21), thereby forming an electrode slurry coating layer (12) of a specific width (D) on the current collector (11).

[0007] In order to maintain the thickness of the electrode slurry coating layer (12) constant, the gap between the electrode slurry discharge unit (21) and the coating roll (10) must be controlled to be constant. In the past, there were attempts to change the position or outer diameter of the coating roll (10) in consideration of the external temperature of the electrode slurry coating system.

[0008] However, these attempts do not take into account the temperature of the discharged electrode slurry. The ambient temperature of the electrode slurry coating system can be controlled through an air conditioning system within the facility, etc. However, the electrode slurry discharged from the electrode slurry slot die section (20) experiences temperature changes within a certain range due to variables such as process steps or heating timing. Typically, the electrode slurry slot die section (20) is designed and manufactured with the intention of discharging electrode slurry at a specific temperature.

[0009] The temperature change of the electrode slurry induces a slight displacement or deformation of the electrode slurry discharge portion (21), which causes the thickness of the electrode slurry coating layer (12) to become uneven.

[0010] Therefore, there is a need for a technology that can implement coating uniformity in response to the temperature of the electrode slurry discharged from the slot die (20) during electrode slurry coating.

[0011] The present invention is intended to solve the problems of the above-mentioned prior art, and the purpose of the present invention is to provide a slot die coater that supplies a constant temperature medium to the inside of a slot die portion to keep the temperature of a lip portion constant, and forcibly deforms the center of the slot die portion to control the horizontal displacement of the lip portion, thereby uniformly forming a coating layer of a coating liquid.

[0012] In order to achieve the above object, a slot die coater for forming a coating layer by discharging a coating liquid on a substrate conveyed by a coating roll according to the present invention includes a manifold portion for receiving the coating liquid and an outlet for discharging the coating liquid received in the manifold portion to the outside, and a slot die portion having a lip portion provided at a front end; a first constant temperature medium movement path provided inside the slot die portion for moving a constant temperature medium for maintaining the temperature of the lip portion, which changes according to a temperature change of the coating liquid, at a preset temperature; a constant temperature medium supply unit for controlling the temperature of the constant temperature medium supplied to the first constant temperature medium movement path and supplying the constant temperature medium to the first constant temperature medium movement path; and a control unit for controlling the operation of the constant temperature medium supply unit.

[0013] The following advantages are achieved by using the slot die coater according to the present invention.

[0014] First, by supplying a constant temperature medium to the inside of the slot die, the temperature of the lip part can be maintained constant regardless of the temperature change of the coating liquid, thereby providing an effect of reducing the displacement of the lip part when the constant temperature medium moves compared to the displacement of the lip part when the constant temperature medium does not move.

[0015] Second, by using a displacement control unit, the horizontal displacement of the lip portion is controlled regardless of the temperature change of the coating liquid, thereby providing an effect of uniform coating of the coating liquid.

[0016] Third, by supplying a constant temperature medium to the inside of the slot die and controlling the horizontal displacement of the lip part based on information from the temperature sensor, displacement sensor, and thickness sensor, it provides the effect of enabling more uniform coating of the coating solution.

[0017] Fourth, by supplying a constant temperature medium to the inside of the slot die section and the inside of the coating roll, the temperature of the slot die section and the temperature of the coating roll are maintained the same, thereby providing an effect of further improving the quality of the coating layer of the coating liquid.

[0018] Fig. 1 is a drawing schematically showing the structure of a slot die coater according to the prior art.

[0019] FIG. 2 is a drawing schematically showing the structure of a slot die coater according to a first embodiment of the present invention.

[0020] FIG. 3 is a schematic drawing showing a cross-section of a slot die according to the first embodiment of the present invention.

[0021] FIG. 4 is a drawing for explaining a constant temperature medium supply unit according to the first embodiment of the present invention.

[0022] FIG. 5 is a drawing schematically showing a displacement measurement position of a lip portion according to the first embodiment of the present invention.

[0023] FIG. 6a and FIG. 6b are graphs showing the results of measuring the displacement amount at each displacement measurement position of the lip portion in the case where the constant temperature medium moves and does not move in the first constant temperature medium movement path according to the first embodiment of the present invention.

[0024] FIG. 7a and FIG. 7b are graphs showing the results of measuring the displacement amount at each displacement measurement position of the lip part according to the temperature change of the coating liquid according to the first embodiment of the present invention.

[0025] FIG. 8 is a schematic drawing showing the structure of a slot die coater equipped with a first temperature sensor according to a first embodiment of the present invention.

[0026] FIG. 9 is a schematic drawing showing the structure of a slot die coater equipped with a displacement sensor according to the first embodiment of the present invention.

[0027] Fig. 10 is a drawing schematically showing the deformation state of a lip portion according to a temperature change of a coating liquid according to the first embodiment of the present invention.

[0028] FIG. 11 is a schematic drawing showing the structure of a slot die coater equipped with a thickness sensor according to the first embodiment of the present invention.

[0029] Fig. 12 is a drawing schematically showing the deformation state of a coating layer according to temperature change of a coating liquid according to the first embodiment of the present invention.

[0030] Fig. 13 is a drawing schematically showing the structure of a slot die coater according to the second embodiment of the present invention.

[0031] Fig. 14 is a schematic drawing showing a cross-section of a slot die according to a second embodiment of the present invention.

[0032] FIG. 15 is a schematic drawing showing a state in which a first fixing position of a first fixing part and a second fixing position of a second fixing part for fixing both sides of a slot die according to a second embodiment of the present invention are located on the inside and outside of a discharge port.

[0033] FIG. 16a is a graph showing displacement of a lip portion according to temperature change of a coating liquid in a state where the first and second fixed positions according to the second embodiment of the present invention are located inside the discharge port.

[0034] FIG. 16b is a graph showing displacement of a lip portion according to temperature change of a coating liquid in a state where the first and second fixed positions according to the second embodiment of the present invention are located outside the discharge port.

[0035] Fig. 17 is a schematic drawing showing the structure of a slot die coater equipped with a displacement sensor according to a second embodiment of the present invention.

[0036] Fig. 18 is a drawing schematically showing the deformation state of a lip portion according to a temperature change of a coating liquid according to a second embodiment of the present invention.

[0037] FIG. 19 is a schematic drawing showing the structure of a slot die coater equipped with a thickness sensor according to a second embodiment of the present invention.

[0038] Figure 20 is a drawing schematically showing the deformation state of the lip portion when the center of the coating layer according to the second embodiment of the present invention is concave.

[0039] Fig. 21 is a drawing schematically showing the deformation state of the lip portion when the center of the coating layer according to the second embodiment of the present invention is convex.

[0040] Fig. 22 is a drawing schematically showing the structure of a slot die coater according to a third embodiment of the present invention.

[0041] Figure 23 is a drawing for explaining the structure of a constant temperature medium supply unit according to a third embodiment of the present invention.

[0042] Fig. 24 is a drawing schematically showing the structure of a slot die coater according to the fourth embodiment of the present invention.

[0043] Fig. 25 is a schematic drawing showing a cross-section of a slot die according to a fourth embodiment of the present invention.

[0044] Figure 26 is a drawing for explaining a constant temperature medium supply unit according to the fourth embodiment of the present invention.

[0045] FIG. 27 is a drawing schematically showing a state in which the first fixing position of the first fixing part and the second fixing position of the second fixing part according to the fourth embodiment of the present invention are provided on the outside of the discharge port.

[0046] Fig. 28 is a drawing schematically showing a displacement measurement position of a lip portion according to the fourth embodiment of the present invention.

[0047] Fig. 29 is a graph showing the result of the displacement of the lip portion being adjusted by the displacement control unit at the displacement measurement position of the lip portion of Fig. 28.

[0048] Figure 30 is a graph showing the results of a state in which the displacement of the lip part is controlled by the displacement control unit according to an increase in the temperature of the coating liquid at the displacement measurement position of the lip part of Figure 28.

[0049] FIG. 31 is a schematic drawing showing the structure of a slot die coater equipped with a temperature sensor according to a fourth embodiment of the present invention.

[0050] FIG. 32 is a schematic drawing showing the structure of a slot die coater equipped with a displacement sensor according to a fourth embodiment of the present invention.

[0051] Figure 33 is a drawing schematically showing the deformation state of a lip portion according to a temperature change of a coating liquid according to a fourth embodiment of the present invention.

[0052] FIG. 34 is a schematic drawing showing the structure of a slot die coater equipped with a thickness sensor according to a fourth embodiment of the present invention.

[0053] Figure 35 is a drawing schematically showing the deformation state of a coating layer according to temperature change of a coating liquid according to the fourth embodiment of the present invention.

[0054] Figure 36 is a drawing schematically showing the deformation state of the lip portion when the center of the coating layer according to the fourth embodiment of the present invention is concave.

[0055] Figure 37 is a drawing schematically showing the deformation state of the lip portion when the center of the coating layer according to the fourth embodiment of the present invention is convex.

[0056] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, where possible, identical components are represented by identical reference numerals in the accompanying drawings. Furthermore, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

[0057] FIG. 2 is a drawing schematically showing the structure of a slot die coater according to a first embodiment of the present invention, FIG. 3 is a drawing schematically showing a cross-section of a slot die portion according to the first embodiment of the present invention, FIG. 4 is a drawing for explaining a constant temperature medium supply unit according to the first embodiment of the present invention, and FIG. 5 is a drawing schematically showing a displacement measurement position of a lip portion according to the first embodiment of the present invention.

[0058] And, FIGS. 6a and 6b are graphs showing the results of measuring the displacement amount at each displacement measurement position of the lip portion in the case where the constant temperature medium moves and does not move in the first constant temperature medium movement path according to the first embodiment of the present invention, and FIGS. 7a and 7b are graphs showing the results of measuring the displacement amount at each displacement measurement position of the lip portion according to the temperature change of the coating liquid according to the first embodiment of the present invention, and FIG. 8 is a drawing schematically showing the structure of a slot die coater equipped with a first temperature sensor according to the first embodiment of the present invention, and FIG. 9 is a drawing schematically showing the structure of a slot die coater equipped with a displacement sensor according to the first embodiment of the present invention.

[0059] And, FIG. 10 is a drawing schematically showing a deformation state of a lip portion according to a temperature change of a coating liquid according to a first embodiment of the present invention, FIG. 11 is a drawing schematically showing a structure of a slot die coater equipped with a thickness sensor according to a first embodiment of the present invention, and FIG. 12 is a drawing schematically showing a deformation state of a coating layer according to a temperature change of a coating liquid according to a first embodiment of the present invention.

[0060] The substrate and coating solution in each of the embodiments described below may be, for example, a collector and a slurry.

[0061] Referring to FIGS. 2 to 12, a slot die coater for forming a coating layer (12) by discharging a coating liquid onto a substrate (11) conveyed by a coating roll (10) according to a first embodiment of the present invention includes a slot die section (100) having a manifold section (130) for receiving the coating liquid and a discharge port (150) for discharging the coating liquid received in the manifold section (130) to the outside, and a lip section (140) provided at a front end; a first constant temperature medium movement path (200) provided inside the slot die section (100) for moving a constant temperature medium to constantly maintain the temperature of the lip section (140), which changes according to a temperature change of the coating liquid, at a preset temperature; It includes a constant temperature medium supply unit (300) that controls the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (200) and supplies the constant temperature medium (P) to the first constant temperature medium movement path (200); and a control unit (400) that controls the operation of the constant temperature medium supply unit (300).

[0062] Hereinafter, the configuration and operation of a slot die coater according to the first embodiment of the present invention will be described in detail with reference to FIGS. 2 to 12.

[0063] Referring to FIGS. 2 to 4, a slot die coater according to a first embodiment of the present invention may include a slot die section (100), a first constant temperature medium movement path (200), a constant temperature medium supply unit (300), and a control section (400).

[0064] Meanwhile, in the slot die (100) illustrated in Fig. 3, the side of the discharge port (150) through which the coating liquid is discharged can be defined as the front side, and the opposite side can be defined as the rear side.

[0065] The slot die section (100) may include a first die (110) and a second die (120) that is combined with the first die (110) to form a manifold section (130) and an outlet (150).

[0066] One side of the first die (110) and one side of the second die (120) may be arranged to face each other, and one side of the two dies (110, 120) facing each other may be parallel to the discharge direction of the coating liquid.

[0067] The manifold section (130) can temporarily receive a coating liquid supplied from an external supply section (not shown).

[0068] The manifold portion (130) may be formed on either the first die (110) or the second die (120). The manifold portion (130) may be formed by indenting one of the surfaces of the first die (110) or the second die (120) that face each other. The manifold portion (130) may be formed in the shape of a groove having a predetermined depth.

[0069] The manifold section (130) can be formed with a structure to widely distribute the coating liquid supplied from the supply section in the longitudinal direction of the slot die section (100).

[0070] The lip portion (140) may be a lip-shaped portion formed at the front end of the slot die portion (100), and a first lip portion (141) may be provided at the front end of the first die (110), and a second lip portion (142) may be provided at the front end of the second die (120).

[0071] Between the first lip portion (141) and the second lip portion (142), an outlet (150) for discharging the coating liquid contained in the manifold portion (130) to the outside of the slot die portion (100) may be provided.

[0072] Meanwhile, although not shown, a shim member may be additionally provided between the first die (110) and the second die (120). The shim member may be configured to space the first die (110) and the second die (120) apart from each other by a predetermined distance, and the distance between the first die (110) and the second die (120), i.e., the width of the discharge port (150) described above, may be determined by the thickness of the shim member. The shim member may be a plate material having a frame structure formed along the edges of the first die (110) and the second die (120), and may have a shape that is open in the direction of the discharge port (150) for discharging the coating liquid. The shim member may have a 'ㄷ' shape.

[0073] Referring to FIGS. 3 and 4, a first constant temperature medium movement path (200) according to the first embodiment of the present invention may be provided inside a slot die section (100) so that a constant temperature medium (P) moves to maintain the temperature of the lip section (140), which changes according to the temperature change of the coating liquid, at a preset temperature.

[0074] The first constant temperature medium movement path (200) according to the first embodiment of the present invention is provided inside the first die (110) and inside the second die (120), respectively, and may be provided in a portion adjacent to the first lip portion (141) and the second lip portion (142), and may extend along the longitudinal width of the slot die portion (100).

[0075] It should be noted that although the constant temperature medium (P) according to the first embodiment of the present invention is suggested to use PCW (Process Cooling Water), which is a cooling water, it is not limited thereto.

[0076] Referring to FIG. 4, the constant temperature medium supply unit (300) according to the first embodiment of the present invention can supply the constant temperature medium (P) to the first constant temperature medium movement path (200) by controlling the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (200). This constant temperature medium supply unit (300) can include a supply line (310), a discharge line (320), a supply valve (330), a discharge valve (340), and a temperature control unit (350).

[0077] The supply line (310) can supply the constant temperature medium (P) to the first constant temperature medium movement path (200), and the discharge line (320) can discharge the constant temperature medium (P) supplied to the first constant temperature medium movement path (200) from the first constant temperature medium movement path (200).

[0078] At this time, the supply valve (330) is installed on the supply line (310) to control the supply amount of the constant temperature medium (P), and the discharge valve (340) is installed on the discharge line (320) to control the discharge amount of the constant temperature medium (P).

[0079] The temperature control unit (350) has one end connected to the supply line (310) and the other end connected to the discharge line (320) so as to control the temperature of the constant-temperature medium (P) supplied to the supply line (310). For example, when the temperature of the coating liquid is higher than a preset temperature and the temperature of the slot die section (100) increases, the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200) through the temperature control unit (350) is lowered so as to lower the temperature of the slot die section (100). On the other hand, when the temperature of the coating liquid is lower than a preset temperature and the temperature of the slot die section (100) decreases, the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200) through the temperature control unit (350) is increased so as to increase the temperature of the slot die section (100).

[0080] The constant temperature medium supply unit (300) according to the first embodiment of the present invention can be installed so that the supply line (310) and the discharge line (320) are connected to each other. Accordingly, the constant temperature medium (P) can be circulated.

[0081] The control unit (400) can control the operation of the constant temperature medium supply unit (300) so that the constant temperature medium (P) can be supplied to the first constant temperature medium movement path (200).

[0082] That is, the constant temperature medium (P) according to the first embodiment of the present invention can move from the supply line (310) through the first constant temperature medium movement path (200) to the discharge line (320). At this time, the supply and discharge amounts of the constant temperature medium (P) can be controlled through the supply valve (330) installed in the supply line (310) and the discharge valve (340) installed in the discharge line (320). In addition, the constant temperature medium (P) discharged from the first constant temperature medium movement path (200) to the discharge line (320) can be moved back to the supply line (310) for recirculation, and before the constant temperature medium (P) moves to the supply line (310), it can be changed to an appropriate temperature through the temperature control unit (350) and then moved to the supply line (310).

[0083] Therefore, the slot die coater according to the first embodiment of the present invention can maintain the temperature of the slot die portion (100) at a constant level regardless of the temperature change of the coating liquid by supplying the constant-temperature medium (P) to the first constant-temperature medium movement path (200) through the constant-temperature medium supply unit (300). Consequently, as the temperature of the slot die portion (100) is maintained at a constant level by the constant-temperature medium (P), the temperature of the lip portion (140) is also maintained at a constant level, so that the displacement amount of the lip portion (140) when the constant-temperature medium (P) moves can be reduced compared to the displacement amount of the lip portion (140) when the constant-temperature medium (P) does not move.

[0084] FIG. 5 is a drawing showing displacement measurement positions of a lip portion according to a first embodiment of the present invention. At this time, the displacement measurement positions of the lip portion may be a center (Center), a first left-right symmetrical position (Left 1, Right 1) that is further from the center in the left-right direction, a second left-right symmetrical position (Left 2, Right 2), and a third left-right symmetrical position (Left 3, Right 3).

[0085] FIG. 6A and FIG. 6B are graphs showing the results of measuring the displacement amount at each displacement measurement position of the lip portion when the constant-temperature medium moves in the first constant-temperature medium movement path according to the first embodiment of the present invention and when it does not move. Here, FIG. 6A shows the displacement amount at each displacement measurement position when the constant-temperature medium moves in the first constant-temperature medium movement path, and FIG. 6B shows the displacement amount at each displacement measurement position when the constant-temperature medium does not move in the first constant-temperature medium movement path. At this time, the graph shows data from an experiment repeated three times, with one cycle being when the supply temperature of the coating solution was changed from 23°C -> 30°C -> 23°C. Here, the upper graph shows the coating solution temperature, the lip temperature, the slot die temperature, and the field temperature, and the lower graph shows the displacement amount at each displacement measurement position of the lip portion.

[0086] FIG. 7a and FIG. 7b are graphs showing the results of measuring the displacement amount at each displacement measurement position of the lip according to the temperature change of the coating liquid according to the first embodiment of the present invention. Here, FIG. 7a shows the displacement amount at each displacement measurement position according to the temperature change of the coating liquid in a state where the constant temperature medium moves in the first constant temperature medium movement path, and FIG. 7b shows the displacement amount at each displacement measurement position according to the temperature change of the coating liquid in a state where the constant temperature medium does not move in the first constant temperature medium movement path.

[0087] That is, as shown in the graphs of FIGS. 6A to 7B, it can be confirmed that the maximum displacement at the center of the lip portion (140) is reduced by approximately 10 μm when the constant-temperature medium (P) moves in the first constant-temperature medium movement path (200) compared to when the constant-temperature medium (P) does not move in the first constant-temperature medium movement path (200). In addition, it can be confirmed that when the constant-temperature medium (P) does not move in the first constant-temperature medium movement path (200), a large difference in displacement occurs at each of the left and right symmetrical positions of the lip portion (140), whereas when the constant-temperature medium (P) moves, almost no difference in displacement occurs at each of the left and right symmetrical positions of the lip portion (140).

[0088] Referring to FIG. 8 together with FIG. 2, the slot die coater according to the first embodiment of the present invention may further include at least one first temperature sensor (500).

[0089] The first temperature sensor (500) is provided on one side of the lip portion (140) and can measure the temperature of the lip portion (140).

[0090] Referring to FIG. 2, it should be noted that the first temperature sensor (500) according to the first embodiment of the present invention is installed at the center side and both side sides along the longitudinal width of the lip portion (140), but is not limited thereto.

[0091] The control unit (400) can control the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (200) based on the temperature value of the lip portion (140) measured and transmitted from the first temperature sensor (500).

[0092] For example, if the temperature of the coating liquid supplied to the manifold unit (130) is lower than the preset temperature, the temperature of the lip unit (140) measured by the first temperature sensor (500) is measured to be lower than the preset temperature. At this time, the control unit (400) receives the temperature value of the lip unit (140) measured by the first temperature sensor (500) and controls the temperature control unit (350) of the constant-temperature medium supply unit (300) so that the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200) increases. Then, the temperature of the lip unit (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid lowered below the preset temperature by the constant-temperature medium (P) moving to the first constant-temperature medium movement path (200).

[0093] In addition, if the temperature of the coating liquid supplied to the manifold unit (130) is higher than the preset temperature, the temperature of the lip unit (140) measured by the first temperature sensor (500) is measured to be higher than the preset temperature. At this time, the control unit (400) receives the temperature value of the lip unit (140) measured by the first temperature sensor (500) and controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to lower the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200). Then, the temperature of the lip unit (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid that has become higher than the preset temperature due to the constant-temperature medium (P) moving to the first constant-temperature medium movement path (200).

[0094] That is, the slot die coater according to the first embodiment of the present invention controls and supplies the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (200) based on the temperature value of the lip portion (140) measured and transmitted from the first temperature sensor (500), thereby maintaining the temperature of the lip portion (140) constant regardless of the temperature of the coating liquid, thereby enabling the displacement amount of the lip portion (140) to be kept constant.

[0095] Referring to FIGS. 9 and 10 together with FIG. 2, the slot die coater according to the first embodiment of the present invention may further include at least one displacement sensor (600).

[0096] A displacement sensor (600) is provided on the front side of the lip portion (140) and can measure the horizontal displacement of the lip portion (140). Meanwhile, in FIG. 2, for the convenience of drawing, the displacement sensor is shown as being provided on the rear side of the slot die portion, but as shown in FIG. 8, it is preferable that the displacement sensor be provided on the front side of the lip portion.

[0097] It should be noted that the displacement sensor (600) is presented as being installed at the center and both sides along the longitudinal width of the lip portion (140), but is not limited thereto.

[0098] The control unit (400) can control the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (200) based on the displacement value of the lip unit (140) measured and transmitted from the displacement sensors (600) on the central side and both side sides of the lip unit (140).

[0099] For example, as shown in (a) of FIG. 10, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is higher than the preset temperature (23°C), both sides of the lip portion (140) tend to expand more than the center, and as shown in (b) of FIG. 10, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is lower than the preset temperature (23°C), both sides of the lip portion (140) tend to contract more than the center.

[0100] At this time, each displacement sensor (600) measures the displacement of the center and both sides of the lip portion (140) and transmits it to the control unit (400), and the control unit (400) controls the temperature of the constant temperature medium (P) to be adjusted based on the displacement value of the center and the displacement value of both sides of the lip portion (140) transmitted from the displacement sensor (600).

[0101] Here, if the displacement values ​​of both sides are smaller than the center displacement value of the lip portion (140) measured by each displacement sensor (600), as shown in (a) of FIG. 10, the temperature of the coating liquid is higher than the preset temperature, and thus the temperature of the lip portion (140) also increases. At this time, the control unit (400) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to lower the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200). Then, the temperature of the lip portion (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid that has become higher than the preset temperature by the constant-temperature medium (P) moving to the first constant-temperature medium movement path (200).

[0102] In addition, when the displacement values ​​of both sides are greater than the displacement value of the center of the lip portion (140) measured by each displacement sensor (600), as shown in (b) of FIG. 10, the temperature of the coating liquid is lower than the preset temperature, and thus the temperature of the lip portion (140) is also lowered. At this time, the control unit (400) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to increase the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200). The temperature of the lip portion (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid lowered below the preset temperature by the constant-temperature medium (P) moving to the first constant-temperature medium movement path (200).

[0103] That is, the slot die coater according to the first embodiment of the present invention controls and supplies the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (200) based on the displacement value of the lip portion (140) measured and transmitted from the displacement sensor (600), thereby maintaining the temperature of the lip portion (140) constant regardless of the temperature of the coating liquid, thereby enabling the displacement amount of the center and both sides of the lip portion (140) to be kept constant.

[0104] Referring to FIGS. 11 and 12 together with FIGS. 2 and 10, the slot die coater according to the first embodiment of the present invention may further include at least one thickness sensor (700).

[0105] Thickness sensors (700) are provided on each of the upper and lower sides of the substrate (11) to measure the coating thickness of the coating solution applied to the substrate (11).

[0106] Referring to FIG. 2, it is suggested that the thickness sensor (700) according to the first embodiment of the present invention is installed at the center side and both side sides along the longitudinal width of the coating roll (10), but it should be noted that the present invention is not limited thereto.

[0107] The control unit (400) can control the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (200) based on the coating thickness value measured and transmitted from the thickness sensor (700).

[0108] For example, as shown in (b) of FIG. 10, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is lower than the preset temperature (23°C) and both sides of the lip portion (140) are contracted to a greater extent than the center, as shown in (a) of FIG. 12, the shape of the coating layer (12) of the coating liquid coated on the substrate (11) may appear as a shape with a concave center, and as shown in (a) of FIG. 10, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is higher than the preset temperature (23°C) and both sides of the lip portion (140) are expanded to a greater extent than the center, as shown in (b) of FIG. 12, the shape of the coating layer (12) of the coating liquid coated on the substrate (11) may appear as a shape with a convex center.

[0109] At this time, each thickness sensor (700) measures the thickness of the center and both sides of the coating layer (12) and transmits it to the control unit (400), and the control unit (400) controls the temperature control unit (350) of the constant temperature medium supply unit (300) based on the thickness value of the center and the thickness value of both sides of the coating layer (12) received from the thickness sensor (700).

[0110] Here, as shown in (a) of FIG. 12, if the thickness values ​​of the sides are greater than the thickness value of the center of the coating layer (12) measured by each thickness sensor (700), the temperature of the coating liquid is lower than the preset temperature, and therefore the temperature of the lip portion (140) is also lowered. At this time, the control unit (400) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to increase the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200). Then, the temperature of the lip portion (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid lowered below the preset temperature by the constant-temperature medium (P) moving to the first constant-temperature medium movement path (200).

[0111] In addition, as shown in (b) of FIG. 12, if the thickness values ​​of the two sides are smaller than the thickness value of the center of the coating layer (12) measured by the thickness sensor (700), the temperature of the coating liquid is higher than the preset temperature, and therefore the temperature of the lip portion (140) also increases. At this time, the control unit (400) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to lower the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (200). Then, the temperature of the lip portion (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid that has become higher than the preset temperature by the constant-temperature medium (P) moving to the first constant-temperature medium movement path (200).

[0112] That is, the slot die coater according to the first embodiment of the present invention controls and supplies the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium moving path (200) based on the thickness value of the coating liquid coating layer (12) measured and transmitted by the thickness sensor (700), thereby maintaining the temperature of the lip portion (140) at a preset temperature regardless of the temperature of the coating liquid, thereby allowing the displacement amount of the center and both sides of the lip portion (140) to be maintained constant. As a result, since the displacement amount of the center and both sides of the lip portion (140) is constant, the coating uniformity of the coating layer (12) of the coating liquid coated on the substrate (11) can be secured.

[0113] Hereinafter, a slot die coater according to a second embodiment of the present invention will be described with reference to FIGS. 13 to 21.

[0114] Referring to FIGS. 13 to 21, a slot die coater for forming a coating layer (12) by discharging a coating liquid onto a substrate (11) conveyed by a coating roll (10) according to a second embodiment of the present invention includes a slot die section (100) having a manifold section (130) for receiving the coating liquid and a discharge port (150) for discharging the coating liquid to the outside, and a lip section (140) provided at a front end; a first fixing section (210) and a second fixing section (220) provided on the lower side of the slot die section to fix both sides of the slot die section (100) from moving; a displacement control section (3001) provided on the rear side of the slot die section (100) to forcibly deform the center of the slot die section (100) to control horizontal displacement of the lip section (140); and a control section (400) for controlling the operation of the displacement control section (3001).

[0115] Hereinafter, the configuration and operation of the slot dani coater according to the second embodiment of the present invention will be described in detail with reference to FIGS. 13 to 21.

[0116] Referring again to FIG. 14 together with FIG. 13, a slot die coater according to a second embodiment of the present invention may include a slot die portion (100), a first fixing portion (210), a second fixing portion (220), a displacement control portion (3001), and a control portion (400).

[0117] The configuration of the slot die portion (100) according to the second embodiment of the present invention is the same as the configuration of the slot die portion (100) according to the first embodiment, so a detailed description will be omitted.

[0118] Meanwhile, in the slot die section (100) illustrated in Fig. 14, the side of the discharge port (150) through which the coating liquid is discharged can be defined as the front side, the opposite side can be defined as the rear side, the part where the first fixing part (210) and the second fixing part (220) are illustrated can be defined as the lower side, the opposite side can be defined as the upper side, and the two sides perpendicular to the lower side can be defined as the two sides.

[0119] According to the second embodiment of the present invention, the first fixing part (210) and the second fixing part (220) are provided on the lower side of the slot die part (100) so that both sides of the slot die part (100) can be fixed so as not to move.

[0120] In this embodiment, it is suggested that each of the first fixing part (210) and the second fixing part (220) fixes both sides of the slot die part (100) by a bolting method using screws, but it should be noted that the present invention is not limited thereto.

[0121] At this time, the first fixing position (P1) of the first fixing part (210) and the second fixing position (P2) of the second fixing part (220) may be provided on both outer sides of the discharge port (150). More specifically, the first fixing position (P1) of the first fixing part (210) and the second fixing position (P1) of the second fixing part (220) may be provided on both sides of the slot die part (100) away from the discharge port (150).

[0122] For example, the coating liquid discharged from the discharge port (150) is applied on the substrate (11) to form a coating layer (12). At this time, the longitudinal width of the discharge port (150) may be the same as the longitudinal width of the coating layer (12) (coating area) of the coating liquid.

[0123] FIG. 15 is a schematic diagram showing a state in which a first fixing position (P1) of a first fixing part (210) and a second fixing position (P2) of a second fixing part (220) for fixing both sides of a slot die part (100) according to a second embodiment of the present invention are located on the inside and outside of a discharge port (150). Here, (a) of FIG. 15 shows a state in which the first fixing position (P1) and the second fixing position (P2) are located on the inside of the discharge port (150), and (b) of FIG. 15 shows a state in which the first fixing position (P1) and the second fixing position (P2) are located on the outside of the discharge port.

[0124] In addition, Fig. 16a is a graph showing the displacement of the lip portion (140) according to the temperature change of the coating liquid in a state where the first fixed position (P1) and the second fixed position (P2) according to the second embodiment of the present invention are located inside the discharge port (150). Here, the first fixed position (P1) and the second fixed position (P2) are located approximately 130 mm inward from both sides of the slot die portion (100).

[0125] In addition, Fig. 16b is a graph showing the displacement of the lip portion (140) according to the temperature change of the coating liquid in a state where the first fixed position (P1) and the second fixed position (P1) according to the second embodiment of the present invention are located outside the discharge port (150). Here, the first fixed position (P1) and the second fixed position (P2) are located approximately 50 mm inward from both sides of the slot die portion (100).

[0126] As shown in the graph of Fig. 16a, when the first fixed position (P1) and the second fixed position (P1) are located inside the discharge port (150) (inside the coating area), it can be confirmed that reverse displacement of the lip portion (150) occurs on both sides of the coating area.

[0127] On the other hand, as shown in the graph of Fig. 16b, when the first fixed position (P1) and the second fixed position (P2) are located outside the coating area (outside the discharge port), it can be confirmed that a positive displacement of the lip portion (140) occurs inside the coating area and a reverse displacement of the lip portion (140) occurs on both sides outside the coating area. That is, a reverse displacement of the lip portion (140) hardly occurs inside the coating area.

[0128] Therefore, it is preferable that the first fixing position (P1) of the first fixing part (210) and the second fixing position (P2) of the second fixing part (220) are located on both sides of the slot die part (100) outside the discharge port (150), and in this case, the horizontal displacement control effect of the lip part (140) using the displacement control part (3001) can be greatly exhibited.

[0129] Referring to FIG. 14 together with FIG. 13, a displacement control unit (3001) according to the second embodiment of the present invention is provided on the rear side of the slot die unit (100), and can be controlled to forcibly deform the center of the slot die unit (100) whose two sides are fixed by the first fixing unit (210) and the second fixing unit (220) so that the horizontal displacement of the lip unit (140) is constant.

[0130] More specifically, the displacement control unit (3001) is provided on the rear side of the slot die unit (100) to adjust the horizontal displacement of the lip unit (140) by pushing the center of the slot die unit (100) toward the coating roll (10) or pulling it in the opposite direction of the coating roll (10). At this time, the displacement control unit (3001) can simultaneously adjust the horizontal displacement of the first lip unit (141) and the second lip unit (142). Meanwhile, although not shown, the displacement control unit (3001) may be provided on the rear sides of the first die unit (110) and the second die unit (120), respectively, to adjust the horizontal displacement of the first lip unit (141) and the horizontal displacement of the second lip unit (142), respectively.

[0131] This displacement control unit (3001) may include a drive motor (3101) that generates a rotational force and a displacement control member (3201) that is connected to the rear of the slot die unit (100) at one end and connected to the drive motor (3101) at the other end, and moves back and forth in a straight line by the rotational force of the drive motor (3101) to control the horizontal displacement of the lip unit (140).

[0132] In this embodiment, the driving motor (3101) is implemented as a servo motor, and the displacement control member (3201) is implemented as a ball screw, but it should be noted that the present invention is not limited thereto. At this time, since the servo motor does not move the slot die section (100) hydraulically, but rather adjusts the displacement of the lip section (140) by adjusting the rotation speed and the stroke through forward / reverse rotation, it is possible to finely adjust the horizontal displacement of the lip section (140).

[0133] That is, when the horizontal displacement of the lip portion (140) changes according to the temperature change of the coating liquid, the displacement control unit (3001) rotates the driving motor (3101) in the forward and reverse directions so that the displacement control member (3201) connected to the driving motor (3101) receives the rotational force of the driving motor (3101) and moves forward and backward. Then, the horizontal displacement of the lip portion (140) can be controlled by pushing the center of the slot die portion (100) toward the coating roll (10) or pulling it in the opposite direction of the coating roll (10) by the forward and backward movement of the displacement control member (3201).

[0134] Therefore, the slot die coater according to the second embodiment of the present invention can maintain the horizontal displacement of the lip portion (140) constant regardless of the temperature change of the coating liquid by controlling the horizontal displacement of the lip portion (140) using the displacement control unit (3001). Consequently, since the horizontal displacement of the lip portion (140) is maintained constant by the displacement control unit (3001), the loading amount of the coating liquid discharged through the discharge port (150) and the thickness of the coating layer (12) can be maintained constant.

[0135] FIG. 17 is a drawing schematically showing the structure of a slot die coater equipped with a displacement sensor according to a second embodiment of the present invention, and FIG. 18 is a drawing schematically showing the deformation state of a lip portion according to a temperature change of a coating liquid according to a second embodiment of the present invention.

[0136] Referring to FIGS. 17 and 18 together with FIG. 13, the slot die coater according to the second embodiment of the present invention may further include at least one displacement sensor (5001).

[0137] A displacement sensor (5001) is provided on the rear side of the lip portion (140) and can measure the horizontal displacement of the lip portion (140).

[0138] It should be noted that although an LVDT (Linear Variable Differential Transformer) is used as the displacement sensor (5001) in this embodiment, it is not limited thereto.

[0139] It should be noted that the displacement sensor (5001) is presented as being installed at the center and both sides along the longitudinal width of the lip portion (140), but is not limited thereto.

[0140] The control unit (400) according to the second embodiment of the present invention can control the displacement control unit (3001) to control the horizontal displacement of the lip unit (140) based on the displacement values ​​of the lip unit (140) received from the displacement sensors (5001) on the central side and both side sides of the lip unit (140).

[0141] For example, as shown in (a) of FIG. 18, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is higher than the preset temperature (23°C), both sides of the lip portion (140) tend to expand more than the center, and as shown in (b) of FIG. 18, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is lower than the preset temperature (23°C), both sides of the lip portion (140) tend to contract more than the center.

[0142] At this time, each displacement sensor (5001) measures the displacement of the center and both sides of the lip portion (140) and transmits it to the control unit (400), and the control unit (400) controls the displacement control unit (3001) based on the displacement value of the center and the displacement value of both sides of the lip portion (140) transmitted from the displacement sensor (5001).

[0143] Here, when the displacement value of the center of the lip portion (140) measured by each displacement sensor (5001) based on the horizontal displacement (D) of the lip portion (140) is larger than the displacement values ​​of both sides but is a positive displacement value (when the center of the lip portion is concave inwardly of the slot die portion), as shown in (a) of FIG. 18, the temperature of the coating liquid is higher than the preset temperature. At this time, the driving motor (3101) is caused to rotate in the forward direction by the control of the control unit (400), so that the displacement control member (3201) moves forward. Then, the center of the slot die portion (100) can be pushed in the direction of the coating roll (10) so that the displacement of the center of the lip portion (140) can be adjusted to be constant with the displacements of both sides.

[0144] In addition, when the displacement value of the center of the lip portion (140) measured by each displacement sensor (5001) based on the horizontal displacement (D) of the lip portion (140) is greater than the displacement values ​​of both sides but is a negative displacement value (when the center of the lip portion has a shape that is convex toward the outside of the slot die portion), as shown in (b) of FIG. 18, the temperature of the coating liquid is lower than the preset temperature. At this time, the driving motor (3101) is caused to rotate in the reverse direction under the control of the control unit (400), so that the displacement control member (3201) moves backward. Then, the displacement of the center of the lip portion (140) can be adjusted to be constant with the displacement of both sides while the center of the slot die portion (100) is pulled in the opposite direction of the coating roll (10).

[0145] That is, the slot die coater according to the second embodiment of the present invention can maintain the horizontal displacement of the lip portion (140) constant regardless of the temperature of the coating liquid by forcibly changing the displacement of the center side of the lip portion (140) by adjusting the displacement control unit (3001) based on the displacement value of the lip portion (140) measured and transmitted from the displacement sensor (5001).

[0146] FIG. 19 is a schematic diagram showing the structure of a slot die coater equipped with a thickness sensor according to the second embodiment of the present invention, FIG. 20 is a schematic diagram showing a deformation state of a lip portion when the center of a coating layer according to the second embodiment of the present invention is concave, and FIG. 21 is a schematic diagram showing a deformation state of a lip portion when the center of a coating layer according to the third embodiment of the present invention is convex. Here, (a) of FIG. 20 shows a state in which the lip portion is forcibly deformed concavely inwardly of the slot die portion by the displacement control unit, and (b) of FIG. 20 shows a state in which the coating layer coated on a substrate is horizontally changed by the control of the displacement control unit in a concave center state, and (a) of FIG. 21 shows a state in which the lip portion is forcibly deformed convexly outwardly of the slot die portion by the displacement control unit, and (b) of FIG. 22 shows a state in which the center of the coating layer coated on a substrate is horizontally changed by the control of the displacement control unit in a convex center state.

[0147] Referring to FIG. 19 together with FIG. 13, the slot die coater according to the second embodiment of the present invention may further include at least one thickness sensor (6001).

[0148] Thickness sensors (6001) are provided on each of the upper and lower sides of the substrate (11) to measure the coating thickness of the coating solution applied to the substrate (11).

[0149] Referring to FIG. 13, it is suggested that the thickness sensor (6001) of the present invention is installed at the center and both side sides along the longitudinal width of the coating roll (10), but it should be noted that the present invention is not limited thereto.

[0150] The control unit (400) can control the displacement control unit (3001) to control the horizontal displacement of the lip unit (140) based on the coating thickness value received from each thickness sensor (6001).

[0151] For example, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is lower than the preset temperature (23°C) and both sides of the lip portion (140) are contracted to a greater extent than the center, as shown in (b) of FIG. 20, the shape of the coating layer (12) of the coating liquid coated on the substrate (11) may appear as a shape with a concave center, and when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is higher than the preset temperature (23°C) and both sides of the lip portion (140) are expanded to a greater extent than the center, as shown in (b) of FIG. 20, the shape of the coating layer (12) of the coating liquid coated on the substrate (11) may appear as a shape with a convex center.

[0152] At this time, each thickness sensor (6001) measures the thickness of the center and both sides of the coating layer (12) and transmits it to the control unit (400), and the control unit (400) controls the displacement control unit (3001) based on the thickness value of the center and the thickness value of both sides of the coating layer (12) received from each thickness sensor (6001).

[0153] Here, as illustrated in (b) of FIG. 20, when the thickness value of the center of the coating layer (12) measured by each thickness sensor (6001) is smaller than the thickness values ​​of the two sides, the driving motor (3101) is controlled by the control unit (400) to rotate in the reverse direction, thereby causing the displacement control member (3201) to move backward. Then, as illustrated in (a) of FIG. 20, the center of the slot die portion (100) is pulled in the opposite direction of the coating roll (10) by the backward movement of the displacement control member (3201), and the center of the lip portion (140) is forcibly deformed to be deformed into a concave shape toward the inside of the slot die portion (100). As a result, as the shape of the center of the lip portion (140) is transformed into a concave shape toward the inside of the slot die portion (100), the amount of the coating liquid discharged toward the center becomes greater than the amount of the coating liquid discharged toward both sides of the discharge port (150), so that the thickness of the coating layer (12) of the coating liquid toward the center is compensated, and thus the thickness of the coating layer (12) can be formed to be uniform overall.

[0154] In addition, as illustrated in (b) of FIG. 21, when the thickness value of the center of the coating layer (12) measured by each thickness sensor (6001) is greater than the thickness values ​​of the two sides, the driving motor (3101) is controlled by the control unit (400) to rotate in the forward direction, thereby causing the displacement control member (3201) to move forward. Then, as illustrated in (a) of FIG. 21, the center of the slot die portion (100) is pushed toward the coating roll (10) by the forward movement of the displacement control member (3201), and the center of the lip portion (140) is forcibly deformed to be deformed into a convex shape toward the outside of the slot die portion (100). As a result, as the central shape of the lip portion (140) is transformed into a convex shape toward the outside of the slot die portion, the amount of coating liquid discharged toward the central portion is less than the amount of coating liquid discharged toward the two sides of the discharge port (150), so that the thickness of the central portion of the coating layer (12) of the coating liquid is compensated, so that the thickness of the coating layer (12) can be formed to be uniform overall.

[0155] That is, the slot die coater according to the second embodiment of the present invention controls the displacement control unit (3001) based on the thickness value of the coating layer (12) of the coating liquid measured and transmitted from the thickness sensor (6001), thereby forcibly deforming the slot die unit (100) to control the displacement toward the center of the lip unit (140), thereby forming a constant thickness of the coating layer (12) of the coating liquid coated on the substrate (11).

[0156] Hereinafter, a slot die coater according to a third embodiment of the present invention will be described with reference to FIGS. 22 and 23.

[0157] Referring to FIGS. 22 and 23, a slot die coater for forming a coating layer by discharging a coating liquid on a substrate (11) conveyed by a coating roll (10) according to a third embodiment of the present invention includes a slot die section (100) having a manifold section (130) for receiving the coating liquid and a discharge port (150) for discharging the coating liquid to the outside, and a lip section (140) provided at a front end; a first constant temperature medium movement path (710) provided inside the slot die section so that a constant temperature medium moves to maintain the temperature of the lip section (140), which changes according to a temperature change of the coating liquid, at a preset temperature; a second constant temperature medium movement path (720) provided inside the coating roll (10), so that the constant temperature medium (P) moves to maintain the temperature of the coating roll to be the same as that of the slot die section; It includes a constant temperature medium supply unit (800) that controls the temperature of the constant temperature medium (P) and supplies the constant temperature medium (P) to the first constant temperature medium movement path (710) and the second constant temperature medium movement path (720); and a control unit (1000) that controls the operation of the constant temperature medium supply unit (800).

[0158] The configuration of the slot die portion (100) according to the third embodiment of the present invention is the same as the configuration of the slot die portion (100) according to the second embodiment, so a detailed description will be omitted.

[0159] Referring to FIG. 22, a first constant temperature medium movement path (710) according to a third embodiment of the present invention may be provided inside a slot die section (100) so that a constant temperature medium (P) moves to maintain the temperature of the lip section (140), which changes according to the temperature change of the coating liquid, at a preset temperature.

[0160] At this time, the first constant temperature medium movement path (710) is provided inside the first die (110) and inside the second die (120), respectively, and may be provided in a portion adjacent to the first lip portion (141) and the second lip portion (142), and may extend along the longitudinal width of the slot die portion (100).

[0161] A second constant temperature medium movement path (720) may be provided inside the coating roll (10) so that the constant temperature medium (P) moves to maintain the temperature of the coating roll (10) the same as the temperature of the slot die section (100).

[0162] It should be noted that although the constant temperature medium (P) according to the third embodiment of the present invention is suggested to use PCW (Process Cooling Water), which is a cooling water, it is not limited thereto.

[0163] Referring to FIG. 23, the constant temperature medium supply unit (800) according to the fourth embodiment of the present invention can supply the constant temperature medium (P) to the first constant temperature medium movement path (710) and the second constant temperature medium movement path (720) by controlling the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (710) and the second constant temperature medium movement path (720).

[0164] This constant temperature medium supply unit (800) includes a first supply line (810) for supplying constant temperature medium (P) to a first constant temperature medium movement path (710), a first discharge line (820) for discharging constant temperature medium (P) from the first constant temperature medium movement path (710), a first supply valve (830) installed on the first supply line (810) to control the supply amount of constant temperature medium (P), a first discharge valve (840) installed on the first discharge line (820) to control the discharge amount of constant temperature medium (P), a second supply line (850) for supplying constant temperature medium (P) to a second constant temperature medium movement path (720), a second discharge line (860) for discharging constant temperature medium (P) from the second constant temperature medium movement path (720), and a second supply line (850) for controlling the supply amount of constant temperature medium (P). It may include a supply valve (870), a second discharge valve (880) installed on the second discharge line (860) to control the discharge amount of the constant temperature medium (P), and a temperature control unit (890) having one side connected to the first supply line (810) and the second supply line (850) and the other side connected to the first discharge line (820) and the second discharge line (860), respectively, to control the temperature of the constant temperature medium (P) supplied to the first supply line (810) and the second supply line (850), respectively.

[0165] The constant temperature medium supply unit (800) according to the third embodiment of the present invention can be installed so that the first supply line (810) and the second discharge line (820) are connected to each other. Accordingly, the constant temperature medium (P) can be circulated along the first supply line (810) and the first discharge line (820).

[0166] Additionally, the constant temperature medium supply unit (800) may be installed so that the second supply line (850) and the second discharge line (860) are connected to each other. Accordingly, the constant temperature medium (P) may be circulated along the second supply line (850) and the second discharge line (860).

[0167] Meanwhile, at least one temperature sensor (9001) for measuring the temperature of the coating liquid discharged through the discharge port (150) may be additionally provided on the front side of the lip portion (140).

[0168] Although not shown in detail, it should be noted that the temperature sensor (9001) according to the third embodiment of the present invention is presented as being installed at the center side and both side sides along the longitudinal width of the discharge port (150), but is not limited thereto.

[0169] The control unit (1000) according to the third embodiment of the present invention can control to adjust the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (710) and the second constant temperature medium movement path (720) based on the temperature value of the coating liquid received from each temperature sensor (800).

[0170] For example, the viscosity of the coating liquid also changes depending on the change in temperature of the coating liquid. If the temperature of the coating liquid changes and the viscosity of the coating liquid changes, the supply pressure for discharging the coating liquid may change, and the coating layer (12) may not be uniformly formed on the substrate (11).

[0171] At this time, if the temperature of the coating liquid measured through the temperature sensor (9001) is lower than the preset temperature, the control unit (1000) receives the temperature value of the coating liquid measured by the temperature sensor (800) and controls the temperature control unit (890) of the constant-temperature medium supply unit (800) to increase the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (710) and the second constant-temperature medium movement path (720). Then, the temperature of the slot die section (100) is increased by the constant-temperature medium (P) moving to the first constant-temperature medium movement path (710), and at the same time, the temperature of the coating roll (10) can be maintained equal to the temperature of the slot die section (100) by the constant-temperature medium (P) moving to the second constant-temperature medium movement path (720). At this time, as the temperature of the slot die part (100) increases, the temperature of the discharged coating liquid increases and can be discharged onto the substrate (11) while maintaining the preset temperature. The coating liquid discharged onto the substrate (11) can form a coating layer (12) while maintaining the preset temperature by the coating roll (10) which is maintained at the same temperature as the temperature of the slot die part (100).

[0172] In addition, if the temperature of the coating liquid measured through the temperature sensor (9001) is higher than the preset temperature, the control unit (1000) receives the temperature value of the coating liquid measured by the temperature sensor (9001) and controls the temperature control unit (890) of the constant-temperature medium supply unit (800) to lower the temperature of the constant-temperature medium (P) supplied to the first constant-temperature medium movement path (710) and the second constant-temperature medium movement path (720). Then, the temperature of the slot die section (100) is lowered by the constant-temperature medium (P) moving to the first constant-temperature medium movement path (710), and at the same time, the temperature of the coating roll (10) can be maintained equal to the temperature of the slot die section (100) by the constant-temperature medium (P) moving to the second constant-temperature medium movement path (720). At this time, as the temperature of the slot die portion (100) decreases, the temperature of the discharged coating liquid decreases, so that it can be discharged onto the substrate (11) while maintaining the preset temperature. The coating liquid discharged onto the substrate (11) can form a coating layer (12) while maintaining the preset temperature by the coating roll (10) maintained at the same temperature as the temperature of the slot die portion (100).

[0173] That is, the slot die coater according to the third embodiment of the present invention can maintain the temperature of the slot die section (100) and the temperature of the coating roll (10) constant by controlling the temperature of the constant temperature medium (P) supplied to the first constant temperature medium movement path (710) and the second constant temperature medium movement path (720) based on the temperature value of the coating liquid measured and transmitted from the temperature sensor (9001), thereby ensuring the uniformity of the coating layer (12) of the coating liquid discharged through the discharge port (150) and coated on the substrate (11).

[0174] Hereinafter, a slot die coater according to a fourth embodiment of the present invention will be described with reference to FIGS. 24 to 37.

[0175] Referring to FIGS. 24 to 37, a slot die coater for forming a coating layer (12) by discharging a coating liquid on a substrate (11) conveyed by a coating roll (10) according to a fourth embodiment of the present invention comprises: a slot die section (100) having a manifold section (130) for receiving a coating liquid and a discharge port (150) for discharging the coating liquid to the outside, and a lip section (140) provided at a front end; a first fixing section (161) and a second fixing section (162) provided on the lower side of the slot die section (100) for fixing both sides of the slot die section (100) from moving; a constant temperature medium movement path (200) provided inside the slot die section (100) for moving a constant temperature medium (P) for maintaining the temperature of the lip section (140), which changes according to a temperature change of the coating liquid, at a preset temperature; It includes a constant temperature medium supply unit (300) that controls the temperature of the constant temperature medium (P) supplied to the constant temperature medium movement path (200) and supplies the constant temperature medium (P) to the constant temperature medium movement path (200); a displacement control unit (4001) that is provided on the rear side of the slot die section (100) and controls the horizontal displacement of the lip section (140) to be constant by forcibly deforming the center of the slot die section (100); and a control unit (501) that controls the operations of the constant temperature medium supply unit (300) and the displacement control unit (4001).

[0176] Hereinafter, the configuration and operation of a slot die coater according to the fourth embodiment of the present invention will be described in detail with reference to FIGS. 24 to 37.

[0177] Referring to FIGS. 24 to 27, a slot die coater according to a fourth embodiment of the present invention may include a slot die section (100), a first fixing section (161), a second fixing section (162), a constant temperature medium movement path (2001), a constant temperature medium supply unit (300), a displacement control section (4001), and a control section (501).

[0178] The configuration of the slot die portion (100) according to the fourth embodiment of the present invention is the same as the configuration of the slot die portion (100) according to the second embodiment, so a detailed description will be omitted.

[0179] Referring to Fig. 26, a constant temperature medium supply unit (300) according to a fourth embodiment of the present invention can supply a constant temperature medium (P) to a constant temperature medium movement path (2001) by controlling the temperature of the constant temperature medium (P) supplied to the constant temperature medium movement path (2001). This constant temperature medium supply unit (300) can include a supply line (310), a discharge line (320), a supply valve (330), a discharge valve (340), and a temperature control unit (350).

[0180] The supply line (310) can supply a constant temperature medium (P) to the constant temperature medium movement path (2001), and the discharge line (320) can discharge the constant temperature medium (P) supplied to the constant temperature medium movement path (2001) from the constant temperature medium movement path (2001).

[0181] At this time, the supply valve (330) is installed on the supply line (310) to control the supply amount of the constant temperature medium (P), and the discharge valve (340) is installed on the discharge line (320) to control the discharge amount of the constant temperature medium (P).

[0182] The temperature control unit (350) can control the temperature of the constant-temperature medium (P) supplied to the supply line (310) by having one end connected to the supply line (310) and the other end connected to the discharge line (320). For example, when the temperature of the coating liquid is higher than a preset temperature and the temperature of the slot die section (100) increases, the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001) through the temperature control unit (350) is lowered so that the temperature of the slot die section (100) is lowered, and when the temperature of the coating liquid is lower than a preset temperature and the temperature of the slot die section (100) is lowered, the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001) through the temperature control unit (350) is increased so that the temperature of the slot die section (100) is increased.

[0183] The constant temperature medium supply unit (300) according to the fourth embodiment of the present invention can be installed so that the supply line (310) and the discharge line (320) are connected to each other. Accordingly, the constant temperature medium (P) can be circulated.

[0184] The control unit (501) can control the operation of the constant temperature medium supply unit (300) so that the constant temperature medium (P) can be supplied to the constant temperature medium movement path (2001).

[0185] That is, the constant temperature medium (P) according to the fourth embodiment of the present invention can move from the supply line (310) through the constant temperature medium movement path (2001) to the discharge line (320). At this time, the supply and discharge amounts of the constant temperature medium (P) can be controlled through the supply valve (330) installed in the supply line (310) and the discharge valve (340) installed in the discharge line (320). In addition, the constant temperature medium (P) discharged from the constant temperature medium movement path (2001) to the discharge line (320) can be moved back to the supply line (310) for recirculation, and before the constant temperature medium (P) moves to the supply line (310), it can be changed to an appropriate temperature through the temperature control unit (350) and then moved to the supply line (310).

[0186] Referring to FIG. 25 together with FIG. 24, a displacement control unit (4001) according to the fourth embodiment of the present invention is provided on the rear side of the slot die unit (100), and can be controlled to forcibly deform the center of the slot die unit (100) whose two sides are fixed by the first fixing unit (161) and the second fixing unit (162) so that the horizontal displacement of the lip unit (140) is constant.

[0187] More specifically, the displacement control unit (4001) is provided on the rear side of the slot die unit (100) and can control the horizontal displacement of the lip unit (140) by pushing the center of the slot die unit (100) toward the coating roll (10) or pulling it in the opposite direction to the coating roll (10). At this time, the displacement control unit (4001) can simultaneously control the horizontal displacement of the first lip unit (141) and the second lip unit (142).

[0188] This displacement control unit (4001) may include a drive motor (410) provided on the rear side of the slot die unit (100) to generate rotational force, and a displacement control member (420) having one side connected to the rear side of the slot die unit (100) and the other side connected to the drive motor (410), and moving linearly back and forth by the rotational force of the drive motor (410) to control the horizontal displacement of the lip unit (140).

[0189] In this embodiment, a servo motor is used as the driving motor (410) and a ball screw is used as the displacement control member (420), but it should be noted that the present invention is not limited thereto. In this case, since the servo motor does not move the slot die part (100) hydraulically, but rather adjusts the displacement of the lip part (140) by adjusting the rotation speed and the stroke through forward / reverse rotation, it is possible to finely adjust the horizontal displacement of the lip part (140).

[0190] That is, when the horizontal displacement of the lip portion (140) changes according to the temperature change of the coating liquid, the displacement control unit (4001) rotates the driving motor (410) in the forward and reverse directions so that the displacement control member (420) connected to the driving motor (410) receives the rotational force of the driving motor (410) and moves forward and backward. Then, the horizontal displacement of the lip portion (140) can be controlled by pushing the center of the slot die portion (100) toward the coating roll (10) or pulling it in the opposite direction of the coating roll (10) by the forward and backward movement of the displacement control member (420).

[0191] Therefore, the slot die coater according to the fourth embodiment of the present invention can maintain the temperature of the slot die portion (100) at a constant level regardless of the temperature change of the coating liquid by supplying the constant-temperature medium (P) to the constant-temperature medium movement path (2001) through the constant-temperature medium supply unit (300). Consequently, as the temperature of the slot die portion (100) is maintained at a constant level by the constant-temperature medium (P), the temperature of the lip portion (140) is also maintained at a constant level, so that the displacement amount of the lip portion (140) when the constant-temperature medium (P) moves can be reduced compared to the displacement amount of the lip portion (140) when the constant-temperature medium (P) does not move.

[0192] In addition, the slot die coater according to the fourth embodiment of the present invention can maintain the horizontal displacement of the lip portion (140) constant regardless of the temperature change of the coating liquid by controlling the horizontal displacement of the lip portion (140) using the displacement control unit (4001). Consequently, since the horizontal displacement of the lip portion (140) is maintained constant by the displacement control unit (4001), the loading amount of the coating liquid discharged through the discharge port (150) and the thickness of the coating layer (12) can be maintained constant.

[0193] Fig. 28 is a drawing showing displacement measurement positions of a lip portion according to a first embodiment of the present invention. At this time, the displacement measurement positions of the lip portion may be a center (Center), a first left-right symmetrical position (Left 1, Right 1) that is further from the center in the left-right direction, a second left-right symmetrical position (Left 2, Right 2), and a third left-right symmetrical position (Left 3, Right 3). Here, the third left-right symmetrical position (Left 3, Right 3) may be a position outside the discharge port (coating area).

[0194] Fig. 29 is a graph showing the results of a state in which the displacement of the lip part is controlled by the displacement control part at the displacement measurement position of the lip part in Fig. 6. Here, the graph shows the experimental data obtained by changing the supply temperature of the coating solution from 23°C -> 30°C -> 23°C. In addition, the upper graph shows the coating solution temperature, lip temperature, slot die temperature, and field temperature, and the lower graph shows each displacement at each displacement measurement position of the lip part.

[0195] That is, as shown in the graph of Fig. 29, when the center of the lip portion (140) is forcibly displaced while the temperature of the coating liquid is maintained at 30°C, it can be confirmed that the displacement of the lip portion (140) at the center (Center), the first left-right symmetrical position (L1 / R1), and the second left-right symmetrical position (L2 / R2) of the lip portion (140) is transformed and maintained in a horizontal state (a state in which the displacement of the lip portion is approximately “0”). At this time, it can be confirmed that a reverse displacement occurs at the third left-right symmetrical position (L3 / R3) of the lip portion (140).

[0196] Fig. 30 is a graph showing the results of the lip displacement being controlled by the displacement control unit according to the change in the temperature of the coating liquid at the displacement measurement position of the lip of Fig. 28. Here, the displacement of the lip is shown as measured by raising the supply temperature of the coating liquid by 1°C from 23°C to 30°C and then lowering it by 1°C from 30°C to 23°C.

[0197] That is, as shown in Fig. 30, when the center of the lip portion (140) is forcibly deformed while the temperature of the coating solution is increased and decreased by 1°C, it can be confirmed that the displacement of the lip portion (140) at the center (Center), the first left-right symmetrical position (L1 / R1), and the second left-right symmetrical position (L2 / R2) of the lip portion (140) at each time the temperature of the coating solution is increased and decreased by 1°C is deformed and maintained in a horizontal state (a state in which the displacement of the lip portion is approximately “0”). At this time, it can be confirmed that a reverse displacement occurs in response to the increase in temperature at the third left-right symmetrical position (L3 / R3) of the lip portion (140).

[0198] Accordingly, as shown in the graphs of FIG. 29 and FIG. 30, reverse displacement occurs at the third left-right symmetrical position (L3 / R3) of the lip portion (140) by forcibly deforming the center of the lip portion, so as shown in FIGS. 27 and 28, it is preferable that the first fixing position (P1) of the first fixing portion (161) and the second fixing position (P2) of the second fixing portion (162) are each provided on the outside of the discharge port (coating area) (both sides outside the discharge port).

[0199] FIG. 31 is a schematic drawing showing the structure of a slot die coater equipped with a temperature sensor according to a fourth embodiment of the present invention.

[0200] Referring to FIG. 31 together with FIG. 24, the slot die coater according to the fourth embodiment of the present invention may further include at least one temperature sensor (610).

[0201] A temperature sensor (610) is provided on one side of the lip portion (140) to measure the temperature of the lip portion (140).

[0202] Referring to FIG. 24, it is suggested that the temperature sensors (610) are installed on the central side and both side sides along the longitudinal width of the lip portion (140), but it should be noted that this is not limited thereto.

[0203] The control unit (501) according to the fourth embodiment of the present invention can control to adjust the temperature of the constant temperature medium (P) supplied to the constant temperature medium movement path (2001) based on the temperature value of the lip unit (140) measured and transmitted from the temperature sensor (610).

[0204] For example, if the temperature of the coating liquid supplied to the manifold unit (130) is lower than the preset temperature, the temperature of the lip unit (140) measured by the temperature sensor (610) is measured to be lower than the preset temperature. At this time, the control unit (501) receives the temperature value of the lip unit (140) measured by the temperature sensor (610) and controls the temperature control unit (350) of the constant-temperature medium supply unit (300) so that the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001) increases. Then, the temperature of the lip unit (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid lowered below the preset temperature by the constant-temperature medium (P) moving to the constant-temperature medium movement path (2001).

[0205] In addition, if the temperature of the coating liquid supplied to the manifold unit (130) is higher than the preset temperature, the temperature of the lip unit (140) measured by the temperature sensor (610) is measured to be higher than the preset temperature. At this time, the control unit (501) receives the temperature value of the lip unit (140) measured by the temperature sensor (610) and controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to lower the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001). Then, the temperature of the lip unit (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid that has become higher than the preset temperature due to the constant-temperature medium (P) moving to the constant-temperature medium movement path (2001).

[0206] That is, the slot die coater according to the fourth embodiment of the present invention controls and supplies the temperature of the constant temperature medium (P) supplied to the constant temperature medium movement path (2001) based on the temperature value of the lip portion (140) received from the temperature sensor (610), thereby maintaining the temperature of the lip portion (140) constant regardless of the temperature of the coating liquid, thereby maintaining the horizontal displacement of the lip portion (140) constant, thereby enabling the loading amount of the coating liquid discharged through the discharge port (150) and the thickness of the coating layer (12) to be maintained constant.

[0207] Referring to FIGS. 32 and 33 together with FIG. 24, the slot die coater according to the fourth embodiment of the present invention may further include at least one displacement sensor (620).

[0208] A displacement sensor (620) is provided on the rear side of the lip portion (140) and can measure the horizontal displacement of the lip portion (140).

[0209] In this embodiment, it is suggested that an LVDT (Linear Variable Differential Transformer) is used as the displacement sensor (620), but it should be noted that the present invention is not limited thereto.

[0210] It should be noted that the displacement sensor (620) is presented as being installed on the central side and both side sides along the longitudinal width of the lip portion (140), but is not limited thereto.

[0211] The control unit (501) can control to adjust the temperature of the constant temperature medium (P) supplied to the constant temperature medium movement path (2001) based on the displacement value of the lip unit (140) measured and transmitted from the displacement sensors (620) on the central side and both side sides of the lip unit (140).

[0212] For example, as shown in (a) of FIG. 33, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is higher than the preset temperature (23°C), both sides of the lip portion (140) tend to expand more than the center, and as shown in (b) of FIG. 33, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is lower than the preset temperature (23°C), both sides of the lip portion (140) tend to contract more than the center.

[0213] At this time, each displacement sensor (620) measures the displacement of the center and both sides of the lip portion (140) and transmits it to the control unit (501), and the control unit (501) controls the temperature of the constant temperature medium (P) to be adjusted based on the displacement value of the center and the displacement value of both sides of the lip portion (140) transmitted from the displacement sensor (620).

[0214] Here, when the displacement value of the center of the lip portion (140) measured by each displacement sensor (620) based on the horizontal displacement (D) of the lip portion (140) is larger than the displacement values ​​of both sides but is a positive displacement value (when the center of the lip portion is concave inwardly of the slot die portion), as shown in (a) of FIG. 33, the temperature of the coating liquid is higher than the preset temperature, and therefore the temperature of the lip portion (140) also increases. At this time, the control unit (501) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to lower the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001). Then, the temperature of the lip part (140) can be maintained at a preset temperature regardless of the temperature of the coating liquid that is higher than the preset temperature by the constant temperature medium (P) moving in the constant temperature medium moving path (2001).

[0215] In addition, in the case where the displacement value of the center of the lip portion (140) measured by each displacement sensor (620) based on the horizontal displacement (D) of the lip portion (140) is greater than the displacement values ​​of both sides but is a negative displacement value (in the case where the center of the lip portion has a shape that is convex toward the outside of the slot die portion), as shown in (b) of FIG. 33, the temperature of the coating liquid is lower than the preset temperature, and therefore the temperature of the lip portion (140) is also lowered. At this time, the control unit (501) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to increase the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001). The temperature of the lip portion (140) can be maintained at a preset temperature regardless of the temperature of the coating solution lowered below the preset temperature by the constant temperature medium (P) moving in the constant temperature medium moving path (2001).

[0216] That is, the slot die coater according to the fourth embodiment of the present invention controls and supplies the temperature of the constant temperature medium (P) supplied to the constant temperature medium movement path (2001) based on the displacement value of the lip portion (140) measured and transmitted from the displacement sensor (620), thereby maintaining the temperature of the lip portion (140) constant regardless of the temperature of the coating liquid, thereby enabling the displacement of the center and both sides of the lip portion (140) to be constant.

[0217] In this embodiment, the control unit (501) can control the displacement control unit (4001) to control the horizontal displacement of the lip unit (140) based on the displacement values ​​of the lip unit (140) received from the displacement sensors (620) on the central side and both side sides of the lip unit (140).

[0218] At this time, if the displacement value of the center of the lip portion (140) measured by the displacement sensor (620) based on the horizontal displacement (D) of the lip portion (140) is larger than the displacement values ​​of both sides but is a positive displacement value (if the center of the lip portion is concave inwardly of the slot die portion), as shown in (a) of FIG. 33, the temperature of the coating liquid is higher than the preset temperature. At this time, the driving motor (410) is caused to rotate in the forward direction by the control of the control unit (501), so that the displacement control member (420) moves forward. Then, the center of the slot die portion (100) can be pushed in the direction of the coating roll (10) so that the displacement of the center of the lip portion (140) can be adjusted to be constant with the displacement of both sides.

[0219] In addition, when the displacement value of the center of the lip portion (140) measured by the displacement sensor (620) based on the horizontal displacement (D) of the lip portion (140) is greater than the displacement values ​​of both sides but is a negative displacement value (when the center of the lip portion has a shape that is convex toward the outside of the slot die portion), as shown in (b) of FIG. 33, the temperature of the coating liquid is lower than the preset temperature. At this time, the driving motor (410) is caused to rotate in the reverse direction under the control of the control unit (501), so that the displacement adjusting member (420) moves backward. Then, the displacement of the center of the lip portion (140) can be adjusted to be constant with the displacement of both sides while the center of the slot die portion (100) is pulled in the opposite direction of the coating roll (10).

[0220] That is, the slot die coater according to the fourth embodiment of the present invention can maintain the horizontal displacement of the lip portion (140) constant regardless of the temperature of the coating liquid by forcibly changing the displacement of the center side of the lip portion (140) by adjusting the displacement control unit (4001) based on the displacement value of the lip portion (140) measured and transmitted from the displacement sensor (620).

[0221] Accordingly, the slot die coater according to the fourth embodiment of the present invention controls and supplies the temperature of the constant temperature medium (P) supplied to the constant temperature medium movement path (2001) based on the displacement value of the lip portion (140) measured and transmitted from the displacement sensor (620), and by controlling the displacement control unit (4001), forcibly changes the displacement of the center of the lip portion (140), thereby maintaining the temperature of the lip portion (140) and the horizontal displacement of the lip portion constant regardless of the temperature of the coating liquid, thereby enabling the loading amount of the coating liquid discharged through the discharge port (150) and the thickness of the coating layer (12) to be constant.

[0222] FIG. 34 is a schematic diagram showing the structure of a slot die coater equipped with a thickness sensor according to the fourth embodiment of the present invention, FIG. 35 is a schematic diagram showing a deformation state of a coating layer according to a temperature change of a coating liquid according to the fourth embodiment of the present invention, FIG. 36 is a schematic diagram showing a deformation state of a lip portion when the center of the coating layer is concave according to the fourth embodiment of the present invention, and FIG. 37 is a schematic diagram showing a deformation state of a lip portion when the center of the coating layer is convex according to the fourth embodiment of the present invention. Here, (a) of FIG. 35 is a diagram showing that the shape of the coating layer of the coating liquid coated on a substrate appears as a concave shape at the center, and (b) of FIG. 35 is a diagram showing that the shape of the coating layer of the coating liquid coated on a substrate appears as a convex shape at the center. In addition, (a) of Fig. 36 shows a state in which the lip portion is forcibly deformed concavely inwardly of the slot die portion by the displacement control unit, (b) of Fig. 36 shows a state in which the coating layer is horizontally changed by the control of the displacement control unit from a concave state at the center of the coating layer coated on the substrate, and (a) of Fig. 37 shows a state in which the lip portion is forcibly deformed convexly outwardly of the slot die portion by the displacement control unit, and (b) of Fig. 37 shows a state in which the coating layer is horizontally changed by the control of the displacement control unit from a convex state at the center of the coating layer coated on the substrate.

[0223] Referring to FIGS. 34 to 37 together with FIGS. 24 and 32, the slot die coater according to the fourth embodiment of the present invention may further include at least one thickness sensor (630).

[0224] Thickness sensors (630) are provided on each of the upper and lower sides of the substrate (11) to measure the coating thickness of the coating solution applied to the substrate (11).

[0225] Referring to FIG. 24, it is shown that the thickness sensor (630) according to the fourth embodiment of the present invention is installed at the center side and both side sides along the longitudinal width of the coating roll (10), but it should be noted that the present invention is not limited thereto.

[0226] The control unit (501) can control to adjust the temperature of the constant temperature medium (P) supplied to the constant temperature medium moving path (2001) based on the coating thickness value measured and transmitted from each thickness sensor (630).

[0227] For example, as shown in (b) of FIG. 33, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is lower than the preset temperature (23°C) and both sides of the lip portion (140) are contracted to a greater extent than the center, as shown in (a) of FIG. 35, the shape of the coating layer (12) of the coating liquid coated on the substrate (11) may appear as a shape with a concave center, and as shown in (a) of FIG. 33, when the temperature of the coating liquid discharged from the discharge port (150) of the slot die portion (100) is higher than the preset temperature (23°C) and both sides of the lip portion (140) are expanded to a greater extent than the center, as shown in (b) of FIG. 35, the shape of the coating layer (12) of the coating liquid coated on the substrate (11) may appear as a shape with a convex center.

[0228] At this time, each thickness sensor (630) measures the thickness of the center and both sides of the coating layer (12) and transmits it to the control unit (501), and the control unit (501) controls the temperature control unit (350) of the constant temperature medium supply unit (300) based on the thickness value of the center and the thickness value of both sides of the coating layer (12) received from the thickness sensor (630).

[0229] Here, as shown in (a) of FIG. 35, if the thickness values ​​of the sides are greater than the thickness value of the center of the coating layer (12) measured by each thickness sensor (630), the temperature of the coating liquid is lower than the preset temperature, and therefore the temperature of the lip portion (140) is also lowered. At this time, the control unit (501) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to increase the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001). Then, the temperature of the lip portion (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid lowered below the preset temperature by the constant-temperature medium (P) moving to the constant-temperature medium movement path (2001).

[0230] In addition, as shown in (b) of FIG. 35, if the thickness values ​​of the two sides are smaller than the thickness value of the center of the coating layer (12) measured by the thickness sensor (630), the temperature of the coating liquid is higher than the preset temperature, and therefore the temperature of the lip portion (140) also increases. At this time, the control unit (501) controls the temperature control unit (350) of the constant-temperature medium supply unit (300) to lower the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium movement path (2001). Then, the temperature of the lip portion (140) can be constantly maintained at the preset temperature regardless of the temperature of the coating liquid that has become higher than the preset temperature by the constant-temperature medium (P) moving to the constant-temperature medium movement path (2001).

[0231] That is, the slot die coater according to the fourth embodiment of the present invention controls and supplies the temperature of the constant-temperature medium (P) supplied to the constant-temperature medium moving path (2001) based on the thickness value of the coating liquid coating layer (12) measured and transmitted by the thickness sensor (630), thereby maintaining the temperature of the lip portion (140) at a preset temperature regardless of the temperature of the coating liquid, thereby maintaining the displacement amount of the center and both sides of the lip portion (140) constant. As a result, since the displacement amount of the center and both sides of the lip portion (140) is constant, the coating uniformity of the coating layer (12) of the coating liquid coated on the substrate (11) can be secured.

[0232] In this embodiment, the control unit (501) can control the displacement control unit (4001) to control the horizontal displacement of the lip portion (140) based on the thickness value of the center portion and the thickness value of both sides of the coating layer (12) received from each thickness sensor (630).

[0233] As shown in (b) of FIG. 36, when the thickness value of the center of the coating layer (12) measured by each thickness sensor (630) is smaller than the thickness values ​​of the two sides, the driving motor (410) is caused to rotate in the reverse direction by the control of the control unit (501), so that the displacement control member (420) moves backward. Then, as shown in (a) of FIG. 36, the center of the slot die section (100) is pulled in the opposite direction of the coating roll (10) by the backward movement of the displacement control member (420), and the center of the lip section (140) is forcibly deformed to be deformed into a concave shape toward the inside of the slot die section (100). As a result, as the shape of the center of the lip portion (140) is transformed into a concave shape toward the inside of the slot die portion (100), the amount of the coating liquid discharged toward the center becomes greater than the amount of the coating liquid discharged toward both sides of the discharge port (150), so that the thickness of the coating layer (12) of the coating liquid toward the center is compensated, and thus the thickness of the coating layer (12) can be formed to be uniform overall.

[0234] In addition, as illustrated in (b) of FIG. 37, when the thickness value of the center of the coating layer (12) measured by each thickness sensor (630) is greater than the thickness values ​​of the two sides, the driving motor (410) is controlled by the control unit (501) to rotate in the forward direction, thereby causing the displacement control member (420) to move forward. Then, as illustrated in (a) of FIG. 37, the center of the slot die portion (100) is pushed toward the coating roll (10) by the forward movement of the displacement control member (420), and the center of the lip portion (140) is forcibly deformed to be deformed into a convex shape toward the outside of the slot die portion (100). As a result, as the shape of the center of the lip portion (140) is transformed into a convex shape toward the outside of the slot die portion (100), the amount of the coating liquid discharged toward the center is less than the amount of the coating liquid discharged toward the both sides of the discharge port (150), so that the thickness of the coating layer (12) of the coating liquid toward the center is compensated, so that the thickness of the coating layer (12) can be formed to be uniform overall.

[0235] That is, the slot die coater according to the fourth embodiment of the present invention controls the displacement control unit (4001) based on the thickness value of the coating layer (12) of the coating liquid measured and transmitted from the thickness sensor (630), thereby forcibly deforming the slot die unit (100) to control the displacement toward the center of the lip unit (140), thereby forming a constant thickness of the coating layer (12) of the coating liquid coated on the substrate (11).

[0236] As described above, the slot die coater according to the present invention supplies a constant temperature medium to the inside of the slot die portion, thereby allowing the temperature of the lip portion to be maintained constant regardless of the temperature change of the coating liquid, thereby reducing the displacement of the lip portion when the constant temperature medium moves compared to the displacement of the lip portion when the constant temperature medium does not move.

[0237] In addition, by using a displacement control unit, the horizontal displacement of the lip portion can be maintained constant regardless of temperature changes in the coating liquid, thereby enabling uniform coating of the coating liquid.

[0238] In addition, by supplying a constant temperature medium to the inside of the slot die and controlling the horizontal displacement of the lip part based on information from the temperature sensor, displacement sensor, and thickness sensor, more uniform coating of the coating solution is possible.

[0239] In addition, by supplying a constant temperature medium to the inside of the slot die section and the inside of the coating roll so that the temperature of the slot die section and the temperature of the coating roll are maintained the same, the quality of the coating layer of the coating liquid can be further improved.

[0240] Since various modifications can be made to the constructions and methods described and illustrated herein without departing from the scope of the present invention, all matters contained in the above detailed description or illustrated in the accompanying drawings are illustrative and not intended to limit the present invention. Accordingly, the scope of the present invention should not be limited by the above-described exemplary embodiments, but should be determined solely in accordance with the following claims and their equivalents.

Claims

1. In a slot die coater that forms a coating layer by discharging a coating liquid on a substrate conveyed by a coating roll, A slot die section including a manifold section for receiving the coating liquid and a discharge port for discharging the coating liquid received in the manifold section to the outside, and a lip section provided at the front end; A first constant temperature medium movement path provided inside the slot die section so that a constant temperature medium moves to maintain the temperature of the lip section, which changes according to the temperature change of the coating liquid, at a preset temperature; A constant temperature medium supply unit that controls the temperature of the constant temperature medium supplied to the first constant temperature medium movement path and supplies the constant temperature medium to the first constant temperature medium movement path; and A control unit that controls the operation of the above-mentioned constant temperature medium supply unit; Slot die coater including.

2. In paragraph 1, The above slot die A first die having a first lip portion provided on the front end; and A second lip portion is provided on the above front end, and a second die is coupled to the first die to form the manifold portion and the discharge port; Including, A slot die coater in which the first constant temperature medium movement path is provided inside the first die and inside the second die, respectively.

3. In paragraph 1, A slot die coater in which the first constant temperature medium movement path extends along the longitudinal width of the slot die section.

4. In paragraph 1, The above constant temperature medium supply unit A supply line for supplying the constant temperature medium to the first constant temperature medium movement path; A discharge line for discharging the constant temperature medium from the first constant temperature medium movement path; A supply valve installed on the above supply line to control the supply amount of the constant temperature medium; A discharge valve installed on the above discharge line to control the discharge amount of the constant temperature medium; and A temperature control unit, one side of which is connected to the supply line and the other side of which is connected to the discharge line, for controlling the temperature of the constant temperature medium supplied to the supply line; Slot die coater including.

5. In paragraph 4, A slot die coater in which the above supply line and the above discharge line are installed to be connected to each other so that the above constant temperature medium can circulate.

6. In paragraph 1, A slot die coater, wherein at least one first temperature sensor for measuring the temperature of the lip portion is additionally provided on one side of the lip portion.

7. In paragraph 6, A slot die coater in which the control unit controls the temperature of the constant temperature medium supplied to the first constant temperature medium moving path based on the temperature value of the lip portion measured and transmitted from the first temperature sensor.

8. In paragraph 1, A slot die coater, wherein at least one displacement sensor for measuring horizontal displacement of the lip portion is additionally provided on the front side of the lip portion.

9. In paragraph 8, A slot die coater in which the control unit controls the temperature of the constant temperature medium supplied to the constant temperature medium moving path based on the horizontal displacement value of the lip portion measured and transmitted from the displacement sensor.

10. In paragraph 1, A slot die coater, wherein at least one thickness sensor for measuring the coating thickness of the coating solution applied to the substrate is additionally provided on each of the upper and lower sides of the substrate.

11. In paragraph 10, A slot die coater in which the control unit controls the temperature of the constant temperature medium based on the coating thickness value of the coating liquid measured and transmitted from the thickness sensor.

12. In a slot die coater that forms a coating layer by discharging a coating liquid on a substrate conveyed by a coating roll, A slot die section including a manifold section for receiving the coating liquid and a discharge port for discharging the coating liquid to the outside, and a lip section provided at the front end; A first fixing part and a second fixing part provided on the lower side of the slot die part to fix both sides of the slot die part so that they do not move; A displacement control unit provided on the rear side of the slot die portion and forcibly deforming the center of the slot die portion to control the horizontal displacement of the lip portion; and A control unit that controls the operation of the displacement control unit; Slot die coater including.

13. In paragraph 12, The above slot die A first die having a first lip portion provided on the front end; and A second lip portion is provided on the above front end, and a second die is coupled to the first die to form the manifold portion and the discharge port; Including, A slot die coater in which the displacement control unit simultaneously controls the horizontal displacement of the first lip unit and the second lip unit.

14. In paragraph 12, The above displacement control unit a driving motor that generates rotational force; and A displacement control member, one side of which is connected to the rear of the slot die portion and the other side of which is connected to the driving motor, and which moves back and forth in a straight line by the rotational force of the driving motor to control the horizontal displacement of the lip portion; Slot die coater including.

15. In paragraph 13, A slot die coater in which the above driving motor is implemented as a servo motor and the above displacement control member is implemented as a ball screw.

16. In paragraph 12, A slot die coater in which the first fixing position of the first fixing part and the second fixing position of the second fixing part are respectively provided on both outer sides of the discharge port.

17. In paragraph 12, A slot die coater, wherein at least one displacement sensor for measuring horizontal displacement of the lip portion is additionally provided on the rear side of the slot die portion.

18. In paragraph 17, A slot die coater in which the control unit controls the displacement control unit to adjust the horizontal displacement of the lip portion based on the horizontal displacement value of the lip portion received from the at least one displacement sensor.

19. In paragraph 12, A slot die coater, wherein at least one thickness sensor for measuring the coating thickness of the coating solution applied to the substrate is additionally provided on each of the upper and lower sides of the substrate.

20. In paragraph 19, A slot die coater in which the control unit controls the displacement control unit to adjust the horizontal displacement of the lip unit based on the coating thickness value of the coating liquid received from the at least one thickness sensor.

21. In a slot die coater that forms a coating layer by discharging a coating liquid on a substrate conveyed by a coating roll, A slot die section including a manifold section for receiving the coating liquid and a discharge port for discharging the coating liquid to the outside, and a lip section provided at the front end; A first constant temperature medium movement path provided inside the slot die section so that a constant temperature medium moves to maintain the temperature of the lip section, which changes according to the temperature change of the coating liquid, at a preset temperature; A second constant temperature medium movement path provided inside the coating roll so that the constant temperature medium moves to maintain the temperature of the coating roll to be the same as that of the slot die section; A constant temperature medium supply unit that controls the temperature of the constant temperature medium and supplies the constant temperature medium to the first constant temperature medium movement path and the second constant temperature medium movement path; and A control unit that controls the operation of the above-mentioned constant temperature medium supply unit; Slot die coater including.

22. In paragraph 21, The above slot die A first die having a first lip portion provided on the front end; and A second lip portion is provided on the above front end, and a second die is coupled to the first die to form the manifold portion and the discharge port; Including, A slot die coater in which the first constant temperature medium movement path is provided inside the first die and inside the second die, respectively.

23. In paragraph 21, The above constant temperature medium supply unit A first supply line for supplying the constant temperature medium to the first constant temperature medium movement path; A first discharge line for discharging the constant temperature medium from the first constant temperature medium movement path; A first supply valve installed on the first supply line to control the supply amount of the constant temperature medium; A first discharge valve installed on the first discharge line to control the discharge amount of the constant temperature medium; A second supply line for supplying the constant temperature medium to the second constant temperature medium movement path; A second discharge line for discharging the constant temperature medium from the second constant temperature medium movement path; A second supply valve installed on the second supply line to control the supply amount of the constant temperature medium; A second discharge valve installed on the second discharge line to control the discharge amount of the constant temperature medium; and A temperature control unit, one side of which is connected to the first supply line and the second supply line, respectively, and the other side of which is connected to the first discharge line and the second discharge line, respectively, and which controls the temperature of the constant temperature medium supplied to the first supply line and the second supply line, respectively; Slot die coater including.

24. In paragraph 23, A slot die coater in which the first supply line and the first discharge line are installed to be connected to each other so that the constant temperature medium circulates, and the second supply line and the second discharge line are installed to be connected to each other so that the constant temperature medium circulates.

25. In paragraph 21, A slot die coater, wherein at least one temperature sensor is additionally provided on the front side of the lip portion to measure the temperature of the coating liquid discharged through the discharge port.

26. In paragraph 25, A slot die coater in which the control unit controls to adjust the temperature of the constant temperature medium supplied to the first constant temperature medium movement path and the second constant temperature medium movement path based on the temperature value of the coating liquid received from the at least one temperature sensor.

27. In a slot die coater that forms a coating layer by discharging a coating liquid on a substrate conveyed by a coating roll, A slot die section including a manifold section for receiving the coating liquid and a discharge port for discharging the coating liquid to the outside, and a lip section provided at the front end; A first fixing part and a second fixing part provided on the lower side of the slot die part to fix both sides of the slot die part so that they do not move; A constant temperature medium movement path provided inside the slot die section so that a constant temperature medium moves to maintain the temperature of the lip section, which changes according to the temperature change of the coating liquid, at a preset temperature; A constant temperature medium supply unit that controls the temperature of the constant temperature medium and supplies the constant temperature medium to the constant temperature medium movement path; A displacement control unit provided on the rear side of the slot die portion and forcibly deforming the center of the slot die portion to control the horizontal displacement of the lip portion; and A control unit that controls the operation of the above-mentioned constant temperature medium supply unit and the above-mentioned displacement control unit; Slot die coater including.

28. In paragraph 27, The above slot die A first die having a first lip portion provided on the front end; and A second lip portion is provided on the above front end, and a second die is coupled to the first die to form the manifold portion and the discharge port; Including, The above constant temperature medium movement path is provided inside the first die and inside the second die, respectively, A slot die coater in which the displacement control unit simultaneously controls the horizontal displacement of the first lip unit and the second lip unit.

29. In paragraph 27, A slot die coater in which the first constant temperature medium movement path extends along the longitudinal width of the slot die section.

30. In paragraph 27, The above constant temperature medium supply unit A supply line for supplying the constant temperature medium to the constant temperature medium movement path; A discharge line for discharging the constant temperature medium from the constant temperature medium movement path; A supply valve installed on the above supply line to control the supply amount of the constant temperature medium; A discharge valve installed on the above discharge line to control the discharge amount of the constant temperature medium; and A temperature control unit, one side of which is connected to the supply line and the other side of which is connected to the discharge line, for controlling the temperature of the constant temperature medium supplied to the supply line; Slot die coater including.

31. In paragraph 30, A slot die coater in which the above supply line and the above discharge line are installed to be connected to each other so that the above constant temperature medium can circulate.

32. In paragraph 27, A slot die coater, wherein at least one first temperature sensor for measuring the temperature of the lip portion is additionally provided on one side of the lip portion.

33. In paragraph 32, A slot die coater in which the control unit controls the temperature of the constant temperature medium supplied to the first constant temperature medium movement path based on the temperature value of the lip portion received from the first temperature sensor.

34. In paragraph 27, The above displacement control unit a driving motor that generates rotational force; and A displacement control member, one side of which is connected to the rear of the slot die portion and the other side of which is connected to the driving motor, moves back and forth in a straight line by the rotational force of the driving motor to control the horizontal displacement of the lip portion; Slot die coater including.

35. In paragraph 34, A slot die coater in which the above driving motor is implemented as a servo motor and the above displacement control member is implemented as a ball screw.

36. In paragraph 27, A slot die coater in which the first fixing position of the first fixing part and the second fixing position of the second fixing part are respectively provided on both outer sides of the discharge port.

37. In paragraph 27, A slot die coater, wherein at least one displacement sensor for measuring horizontal displacement of the lip portion is additionally provided on the rear side of the slot die portion.

38. In paragraph 37, A slot die coater in which the control unit controls to adjust the temperature of the constant temperature medium supplied to the first constant temperature medium movement path based on the horizontal displacement value of the lip portion received from the at least one displacement sensor, and the displacement control unit controls to adjust the horizontal displacement of the lip portion.

39. In paragraph 27, A slot die coater, wherein at least one thickness sensor for measuring the coating thickness of the coating solution applied to the substrate is additionally provided on each of the upper and lower sides of the substrate.

40. In paragraph 39, A slot die coater in which the control unit controls the temperature of the constant temperature medium based on the coating thickness value of the coating liquid received from the thickness sensor, and the displacement control unit controls the horizontal displacement of the lip portion.

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