Slit coating head, coating machine and working method of slit coating head

Abstract

The invention belongs to the technical field of general methods for coating fluid on surfaces, and particularly relates to a coating head with a slit type outlet, in particular to a slit coating head, a coating machine and a working method of the slit coating head. The slit coating head comprises an upper coating die head and a lower coating die head, a coating slit is formed between the upper coating die head and the lower coating die head; wherein a main runner and a plurality of auxiliary runners are formed in the upper coating die head; the main runner is communicated with each slave runner; and an adjusting mechanism is arranged in each slave runner, and the adjusting mechanisms are configured to be used for detecting the flow of the slurry in the corresponding slave runners so as to adjust the flow of the slurry in the slave runners. By means of the dynamic adjusting mode of the adjusting mechanism, the pressure fluctuation of the slurry flow is effectively avoided while the slurry flow from the runner is adjusted, and the film coating consistency of the coating slits is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of general methods for surface coating fluids, and particularly relates to a coating head with a slit-shaped outlet, and more particularly to a slit coating head, a coating machine, and a working method of the slit coating head. Background Art

[0002] When coating an electronic protective film, the slit coating method is mainly used. In slit coating, since the feed port in the coating die head is provided in the center of the die head, during the cavity pressure equalization process, when the slurry flows from the feed port to both ends of the cavity, due to the long flow path, the pressure drop is large, resulting in a large pressure difference between the central position and the two ends of the cavity, and the cavity pressure gradually decreases from the central position to the two ends. Different cavity pressures result in different coating thicknesses and poor coating uniformity.

[0003] In this regard, in related technologies, multiple shunt channels are usually used for slurry equalization. By setting flow blocking blocks in each shunt channel to change the effective cross-sectional area of the corresponding shunt channel, and then changing the flow pressure of the flow, the slurry flows into the flow channel with a small flow pressure, and the slurry distribution is optimized through pressure balance.

[0004] However, since the flow blocking block realizes pressure adjustment by adjusting the effective cross-sectional area of the flow channel, when the effective cross-sectional area of the corresponding flow channel decreases, an instantaneous impact will be caused, which will lead to a sudden increase in pressure in the flow channel, and then increase the shear rate of the slurry, resulting in an instantaneous decrease in the slurry viscosity, and further amplifying the amplitude of the flow rate and pressure fluctuations.

[0005] Based on the above problems, it is necessary to design a slit coating head, a coating machine, and a working method of the slit coating head.

[0006] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Invention

[0007] The embodiments of the present disclosure at least provide a slit coating head, a coating machine, and a working method of the slit coating head.

[0008] In a first aspect, the embodiments of the present disclosure provide a slit coating head, including: an upper coating die head and a lower coating die head; A coating slit is formed between the upper coating die head and the lower coating die head; wherein A main flow channel and a plurality of sub-flow channels are formed in the upper coating die head; The main flow channel is connected to each sub-flow channel; and An adjusting mechanism is provided in each of the slave channels, and the adjusting mechanism is configured to detect the flow rate of the slurry in the corresponding slave channel to adjust the flow rate of the slurry in the slave channel.

[0009] In an optional embodiment, the adjusting mechanism includes: a flow-blocking adjusting column and a flow sensor; The flow sensor is disposed at the discharge port of the slave channel; and The flow-blocking adjusting column is slidably disposed in the slave channel; wherein The flow-blocking adjusting column is configured to slide according to the flow rate data obtained by the flow sensor, thereby adjusting the effective cross-sectional area of the feed port of the slave channel.

[0010] In an optional embodiment, the bottom end surface of the flow-blocking adjusting column is inclined to guide the slurry entering from the feed port of the slave channel to smoothly transition from horizontal flow to vertical flow; and A buffer flow channel is further formed inside the flow-blocking adjusting column, and a first opening of the buffer flow channel is located on the arc-shaped side wall of the adjusting column, and a second opening is located on the inclined bottom wall of the adjusting column.

[0011] In an optional embodiment, the adjusting mechanism further includes: a control module; The control module is electrically connected to the flow sensor and the driving member of the flow-blocking adjusting column respectively; wherein The control module is configured to obtain the flow rate data detected by the flow sensor, and control the start and stop of the driving member of the flow-blocking adjusting column according to the flow rate data, thereby adjusting the position of the flow-blocking adjusting column in the slave channel.

[0012] In an optional embodiment, when the flow-blocking adjusting column moves downward from the starting position to reduce the cross-sectional area of the feed port of the slave channel, the second opening of the buffer flow channel is configured to absorb the pressure fluctuation generated when the flow-blocking adjusting column moves.

[0013] In an optional embodiment, when the flow-blocking adjusting column moves until the feed port of the slave channel is closed, the first opening of the buffer flow channel is communicated with the feed port of the slave channel, and at this time, the buffer flow channel is configured to provide a flow path for the slurry.

[0014] In a second aspect, an embodiment of the present disclosure further provides a coater, including: an unwinding device, a winding device, and a slot coater head; The slot coater head is adapted to adopt the slot coater head according to any one of the claims; The slot coater head is disposed between the unwinding device and the winding device; The unwinding device is configured to unwind a film, and the slot coater head coats the unwound film; and The rewinding device is configured to wind the coated film.

[0015] In a third aspect, an embodiment of the present disclosure further provides a working method for a slot coating head, including: controlling the flow rate of the slurry in the flow channel through an adjusting mechanism, that is When the flow rate of the slurry in the corresponding flow channel in the slot coating head exceeds the preset flow rate, lower the flow blocking adjustment column in the flow channel to reduce the effective cross-sectional area of the feed port of the flow channel, thereby increasing the resistance of the slurry flowing into the flow channel; and When the flow rate still exceeds the preset flow rate after the effective cross-sectional area of the feed port of the flow channel is adjusted to the minimum threshold, continue to lower the flow blocking adjustment column so that the first opening of the flow blocking adjustment column communicates with the feed port of the flow channel, so that the slurry flows into the flow channel from the buffer channel.

[0016] The beneficial effect of the present invention is that the slot coating head includes: an upper coating die head and a lower coating die head; a coating slit is formed between the upper coating die head and the lower coating die head; wherein a main flow channel and a plurality of secondary flow channels are formed in the upper coating die head; the main flow channel is communicated with each secondary flow channel; and an adjusting mechanism is provided in each secondary flow channel, and the adjusting mechanism is configured to detect the flow rate of the slurry in the corresponding secondary flow channel to adjust the flow rate of the slurry in the secondary flow channel. By means of the dynamic adjustment method of the adjusting mechanism, while adjusting the flow rate of the slurry in the secondary flow channel, the pressure fluctuation of the slurry flow rate can be effectively avoided, and the consistency of the coating of the film by the coating slit is ensured.

[0017] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0018] In order to make the above objectives, features, and advantages of the present invention more obvious and understandable, specific preferred embodiments are hereby exemplified and described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of a slot coating head provided by an embodiment of the present disclosure; Figure 2 It is a partial structural schematic diagram of a slot coating head provided by an embodiment of the present disclosure; Figure 3 Schematic cross-sectional structure diagram of a slit coating head provided by an embodiment of the present disclosure; Figure 4 Schematic structure diagram of a coating machine provided by an embodiment of the present disclosure; Figure 5 Schematic diagram of the first state of a flow-blocking adjustment column provided by an embodiment of the present disclosure; Figure 6 Schematic diagram of the second state of a flow-blocking adjustment column provided by an embodiment of the present disclosure; Figure 7 Schematic diagram of the third state of a flow-blocking adjustment column provided by an embodiment of the present disclosure; Figure 8 Schematic internal structure diagram of a flow-blocking adjustment column provided by an embodiment of the present disclosure.

[0021] In the figure: 1 Slit coating head, 11 Upper coating die head, 111 Main flow channel, 112 Secondary flow channel, 12 Adjustment mechanism, 120 Driving member, 121 Flow-blocking adjustment column, 122 Flow sensor, 123 Buffer flow channel, 124 First opening, 125 Second opening, 13 Feed port, 15 Lower coating die head, 151 Accommodation cavity, 16 Coating slit; 2 Unwinding device; 3 Rewinding device; 4 Film. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] As used herein, phrases such as "in one embodiment", "according to an embodiment", "in some embodiments", etc. generally refer to the fact that the specific features, structures, or characteristics after the phrase can be included in at least one embodiment of the present disclosure. Therefore, a specific feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, terms such as "example", "exemplary", etc. are used "as an example, instance, or illustration. Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other embodiments, aspects, or designs. Instead, the use of terms such as "example", "exemplary", etc. is intended to present concepts in a specific manner.

[0024] When coating an electronic protective film, the main slurry is an epoxy resin-based slurry of nano-silica, and the coating is carried out by means of slot coating. The inventor found that in slot coating, when the traditional flow-blocking block reduces the cross-sectional area of the flow channel, an instantaneous impact will be caused. For a slurry with a large density difference such as the epoxy resin-based slurry of nano-silica, the shear rate of the slurry will increase due to the instantaneous pressure surge, and then the viscosity of the slurry will drop instantaneously, which further amplifies the amplitude of the flow velocity and pressure fluctuations, resulting in repeated adjustments.

[0025] All the defects existing in the above solutions are the results obtained by the inventor through practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed in this disclosure by the present disclosure for the above problems should be the contributions made by the inventor to the present disclosure during the process of the present disclosure.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0028] As Figure 1 shown, at least one disclosed embodiment provides a slot coating head, including: an upper coating die head 11 and a lower coating die head 15; a coating slot 16 is formed between the upper coating die head 11 and the lower coating die head 15; a main flow channel 111 and a plurality of sub-flow channels 112 are provided in the upper coating die head 11; the main flow channel 111 is communicated with each sub-flow channel 112; and an adjusting mechanism 12 is provided in each sub-flow channel 112, and the adjusting mechanism 12 is configured to detect the flow rate of the slurry in the corresponding sub-flow channel 112 to adjust the flow rate of the slurry in the sub-flow channel 112.

[0029] In this embodiment, by providing a plurality of sub-flow channels 112, the slurry in the main flow channel 111 can flow into the accommodation cavity 151 more evenly. The adjusting mechanism 12 provided in the corresponding sub-flow channel 112 is used to adjust the size of the feed port of the sub-flow channel, thereby changing the flow resistance of the slurry in the sub-flow channel 112. Specifically, if the flow rate of the slurry in a certain sub-flow channel 112 is greater than the preset flow rate, at this time, the driving member 120 drives the flow-blocking adjusting column 121 to move to reduce the cross-sectional area of the feed port of the sub-flow channel 112, so that the resistance of the slurry flowing into this sub-flow channel 112 increases, and then the flow rate of the slurry flowing into the sub-flow channel 112 is reduced.

[0030] Specifically, the driving member 120 includes, but is not limited to, driving the flow-blocking adjusting column 121 to move by means of a micro-cylinder or a combination of a micro-motor and a lead screw.

[0031] As Figure 2 and Figure 8 shown, in an alternative embodiment, the adjustment mechanism 12 includes: a flow blocking adjustment column 121 and a flow sensor 122; the flow sensor 122 is disposed at the discharge port of the secondary flow channel 112; and the flow blocking adjustment column 121 is slidably disposed within the secondary flow channel 112; wherein the flow blocking adjustment column 121 is configured to slide according to the flow data obtained by the flow sensor 122, thereby adjusting the effective cross-sectional area of the inlet of the secondary flow channel 112.

[0032] Specifically as Figure 5 、 Figure 6 and Figure 7 shown, the lower end surface of the flow blocking adjustment column 121 is inclined. Under normal flow conditions, the slurry will, as Figure 5 shown in the direction of F, be guided by the lower end surface of the flow blocking adjustment column 121 and smoothly transition from horizontal flow to vertical flow by the slurry entering from the inlet of the secondary flow channel, so as to avoid flow fluctuations of the slurry. At the same time, when it is necessary to reduce the effective cross-sectional area of the inlet of the secondary flow channel, as Figure 6 shown, the slurry still flows in the direction of F in the figure at this time, but the buffer flow channel 123 opened in the flow blocking adjustment column 121 can absorb the pressure fluctuations generated during its adjustment. Specifically, during coating, the slurry fills the secondary flow channel. When the pressure in the secondary flow channel increases, the slurry will preferentially flow to the position with lower pressure. Since the width of the flow port of the buffer flow channel 123 is greater than the width of the coating slit, therefore, the flow resistance of the buffer flow channel is lower. When the pressure suddenly increases, due to the characteristic of "flowing from high pressure to low pressure", the slurry will preferentially flow into the buffer flow channel with lower pressure, thereby relieving the pressure in the secondary flow channel. And, since there is gas in the buffer flow channel and the gas is compressible, in this regard, the gas in the buffer flow channel is compressed by the flowing slurry to form a spring-like effect to store pressure energy and relieve the pressure peak in the flow channel. At the same time, since the fixed end of the driving member is fixedly disposed on the die head, the flow blocking adjustment column 121 itself will not move, thereby ensuring that the slurry in the secondary flow channel 112 still flows as stably as possible during the adjustment process.

[0033] At the same time, in the related art, when the flow rate in a certain secondary flow channel 112 is always large, there will be a phenomenon that the flow blocking adjustment column 121 is over-adjusted, resulting in the closing of the secondary flow channel 112, and thus coating defects occur.

[0034] Based on the above problems, if the flow rate in a certain secondary flow channel is always large, that is, when the flow blocking adjustment column 121 moves downward to the limit position and it is still found that the flow rate here is greater than the preset flow rate, continue to move the flow blocking adjustment column 121 downward, as Figure 7As shown, the first opening 124 of the buffer channel 123 is connected to the feed port of the secondary channel, so that the slurry in the secondary channel flows along the F2 direction. Since the buffer channel 123 is provided with multiple bends, the flow resistance is further increased while ensuring that there is always slurry flowing in the channel, avoiding coating vacancies caused by the channel being closed.

[0035] Specifically, when the flow-blocking adjustment column 121 moves downward from the starting position to reduce the cross-sectional area of the feed port of the secondary channel, the second opening of the buffer channel is configured to absorb the pressure fluctuations generated when the flow-blocking adjustment column 121 moves. When the flow-blocking adjustment column moves until the feed port of the secondary channel is closed, the first opening of the buffer channel is connected to the feed port of the secondary channel, and at this time, the buffer channel is configured to provide a flow path for the slurry.

[0036] In this embodiment, the pressure condition in the secondary channel 112 is reflected by detecting the flow rate of the slurry. When the flow rates in the secondary channels 112 are the same, it indicates that the pressures in the secondary channels 112 are the same, and the amounts of slurry entering the accommodation cavity 151 from the secondary channels 112 are the same, ensuring that the pressures of the slurry for coating flowing out through the coating slit 16 from the accommodation cavity 151 are the same at each position, ensuring coating consistency.

[0037] As Figure 1 shown, in an alternative embodiment, a feed port 13 is formed on the upper coating die head 11, and the feed port 13 is communicated with the main channel 111, and the slurry is filled into the main channel 111 through the feed port 13; an accommodation cavity 151 is formed between the upper coating die head 11 and the lower coating die head 15; the accommodation cavity 151 is communicated with the coating slit 16, and the slurry in the accommodation cavity 151 flows out through the coating slit 16 for coating.

[0038] As Figure 4 shown, at least one other disclosed embodiment further provides a coating machine, including an unwinding device 2, a winding device 3, and a slot coating head 1; the slot coating head 1 is adapted to use the above-mentioned slot coating head 1; the slot coating head 1 is arranged between the unwinding device 2 and the winding device 3; the unwinding device 2 is configured to unwind the film 4, and the slot coating head 1 coats the unwound film 4; and the winding device 3 is configured to wind the coated film 4.

[0039] In an alternative embodiment, the unwinding device 2 includes but is not limited to being realized by driving an unwinding roller with a servo motor, and the winding device 3 includes but is not limited to being realized by driving a winding roller with a servo motor.

[0040] Specifically, the film 4 is an electronic protective film.

[0041] In this embodiment, the servo motor can be overall controlled by the control module to keep the film 4 taut during the coating process.

[0042] In this embodiment, the servo motor is not shown.

[0043] In this embodiment, the feed inlet 13 can be connected with a material conveying pipe to continuously convey the slurry into the feed inlet 13.

[0044] In this embodiment, between the unwinding device 2 and the winding device 3, there are included but not limited to other devices such as a dryer and a thickness gauge for realizing the coating of the electronic protective film.

[0045] At least one other disclosed embodiment also provides a working method of a slot coater head, including: controlling the flow rate of the slurry in the flow channel 112 through the adjusting mechanism 12, that is, when the flow rate of the slurry in the corresponding flow channel in the slot coater head 1 exceeds the preset flow rate, lowering the flow resistance adjusting column in the flow channel to reduce the effective cross-sectional area of the feed inlet of the flow channel, thereby increasing the resistance of the slurry flowing into the flow channel; and when the flow rate still exceeds the preset flow rate after the effective cross-sectional area of the feed inlet of the flow channel 112 is adjusted to the minimum threshold, continuing to lower the flow resistance adjusting column to connect the first opening of the flow resistance adjusting column with the feed inlet of the flow channel 112, so that the slurry flows into the flow channel from the buffer channel.

[0046] At least one other disclosed embodiment also provides a working method of a coating machine, including: the film 4 unwound by the unwinding device 2 is coated when passing through the slot coater head 1, and then the winding device 3 winds the coated film 4.

[0047] In summary, the present slot coater head includes: an upper coating die head and a lower coating die head; a coating slit is formed between the upper coating die head and the lower coating die head; wherein a main flow channel and a plurality of sub-flow channels are formed in the upper coating die head; the main flow channel is communicated with each sub-flow channel; and an adjusting mechanism is arranged in each sub-flow channel, and the adjusting mechanism is configured to detect the flow rate of the slurry in the corresponding sub-flow channel to adjust the flow rate of the slurry in the sub-flow channel. By the dynamic adjustment method of the adjusting mechanism, while adjusting the flow rate of the slurry in the sub-flow channel, the pressure fluctuation of the slurry flow rate is effectively avoided, and the consistency of the coating of the film by the coating slit is ensured.

[0048] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0049] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, terms such as "first", "second" and other numerical terms used herein do not imply an order or sequence unless expressly indicated herein. Thus, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer or section discussed above may be referred to as the second element, component, region, layer or section.

[0050] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper", etc., may be used herein to facilitate describing the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientation depicted in the figures, spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is turned over, an element described as "beneath" or "below" another element or feature will be oriented "above" the other element or feature.

[0051] Based on the above inspiration from the ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A slit coating head, characterized in that, Comprising: an upper coating die head (11) and a lower coating die head (15); a coating slit (16) is formed between the upper coating die head (11) and the lower coating die head (15); wherein a main flow channel (111) and a plurality of secondary flow channels (112) are formed in the upper coating die head (11); the main flow channel (111) is communicated with each secondary flow channel (112); and an adjusting mechanism (12) is arranged in each secondary flow channel (112), and the adjusting mechanism (12) is configured to detect the flow rate of the slurry in the corresponding secondary flow channel (112) so as to adjust the flow rate of the slurry in the secondary flow channel (112).

2. The slit coating head according to claim 1, wherein the adjusting mechanism (12) comprises: a flow blocking adjusting column (121) and a flow sensor (122); the flow sensor (122) is arranged at the discharge port of the secondary flow channel (112); and the flow blocking adjusting column (121) is slidably arranged in the secondary flow channel (112); wherein the flow blocking adjusting column (121) is configured to slide according to the flow rate data obtained by the flow sensor (122), so as to adjust the effective cross-sectional area of the feed port of the secondary flow channel (112).

3. The slit coating head according to claim 2, wherein the bottom end surface of the flow blocking adjusting column is inclined to guide the slurry entering from the feed port of the secondary flow channel to smoothly transition from horizontal flow to vertical flow; and a buffer flow channel (123) is further formed inside the flow blocking adjusting column (121), a first opening (124) of the buffer flow channel is located on the arc-shaped side wall of the flow blocking adjusting column (121), and a second opening (125) is located on the inclined bottom wall of the flow blocking adjusting column (121).

4. The slit coating head according to claim 3, wherein the adjusting mechanism (12) further comprises: a control module; the control module is electrically connected to the flow sensor (122) and a driving member (120) of the flow blocking adjusting column (121) respectively; wherein the control module is configured to obtain the flow rate data detected by the flow sensor (122), and control the start and stop of the driving member (120) of the flow blocking adjusting column (121) according to the flow rate data, so as to adjust the position of the flow blocking adjusting column (121) in the secondary flow channel (112).

5. The slit coating head according to claim 4, wherein when the flow blocking adjusting column (121) moves downward from the starting position to reduce the cross-sectional area of the feed port of the secondary flow channel, the second opening (125) of the buffer flow channel is configured to absorb the pressure fluctuation generated when the flow blocking adjusting column (121) moves.

6. The slit coating head according to claim 5, wherein when the flow blocking adjusting column (121) moves until the feed port of the secondary flow channel is closed, the first opening (124) of the buffer flow channel is communicated with the feed port of the secondary flow channel, and at this time, the buffer flow channel is configured to provide a flow path for the slurry.

7. The slit coating head according to claim 1, wherein a receiving cavity (151) is formed between the upper coating die head (11) and the lower coating die head (15); The accommodating cavity (151) communicates with the coating slit (16), and the slurry in the accommodating cavity (151) flows out from the coating slit (16) for coating.

8. A coater, characterized in that, Comprising: An unwinding device (2), a winding device (3), and a slot die coater (1); The slot die coater (1) is adapted to use the slot die coater (1) according to any one of claims 1-7.

9. The coating machine according to claim 8, wherein The slot die coater (1) is disposed between the unwinding device (2) and the winding device (3); The unwinding device (2) is configured to unwind a film (4), and the slot die coater (1) coats the unwound film (4); and The winding device (3) is configured to wind the coated film (4).

10. A working method of a slit coating head, characterized in that, Comprising: Using the slot die coater (1) according to any one of claims 1-7; And Controlling the flow rate of the slurry in the flow channel (112) through an adjusting mechanism (12), that is When the flow rate of the slurry corresponding to the flow channel in the slot die coater (1) exceeds the preset flow rate, the flow blocking adjustment column (121) in the flow channel is moved downward to reduce the effective cross-sectional area of the inlet of the flow channel, thereby increasing the resistance of the slurry flowing into the flow channel; and When the flow rate still exceeds the preset flow rate after the effective cross-sectional area of the inlet of the flow channel (112) is adjusted to the minimum threshold, the flow blocking adjustment column (121) is continuously moved downward to connect the first opening of the flow blocking adjustment column (121) with the inlet of the flow channel (112), so that the slurry flows into the flow channel from the buffer channel.

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