TWI725585B - Slot die coater - Google Patents

Abstract

The disclosure relates to a slot die coater including a slot die head that includes a first body and a second body, the second body is disposed on the first body, the first body has a first surface and a distribution chamber on the first surface. The second body has a second surface. The first surface and the second surface face each other and form a slot gap therebetween. The deepest depth of the distribution chamber is D, the slot gap has a gap value of G, and the following condition is satisfied: 8>D/G>18.

Description

Slit coater

The invention relates to a slit type coater, in particular to a slit type coater with a shunt tube.

Precision coating technology is an important development direction of thin film technology in the future. Among many coating technologies, slot die coating technology is one of the wide-ranging applications and deep development potentials. For example, it is often used in Lithium battery paste is used to make internal components of lithium battery. In recent years, the market has increasingly strict requirements for the uniformity of coating films.

However, for coatings containing particles, if the speed of the coating decreases during the process of pushing in the coating head, the problem of sedimentation or deposition of the coating particles will occur. Therefore, after using the slit coater traditionally for a period of time, it is often found that there will be problems with the deposition of paint particles in the shunt pipe in the coating head. As the amount of deposition increases, the amount of paint output from the coating head will be reduced. The change will not only affect the uniformity of the coating, but also cause the result of not reaching the expected output.

In this regard, the traditional solution is to increase the output of the paint during the coating process or each time the coating is applied to match the gradual shrinkage and change of the volume and shape of the shunt pipe due to the continuous deposition of the paint. The effect of this method is limited and the accuracy is difficult to control. Instead, many uncertain factors are added. If the deposition is too serious, it will also cause the coating machine to face the result of the need to suspend the operation and seriously delay the shipment schedule. In addition, traditionally, the coating head is regularly disassembled to clean the shunt tube to eliminate the deposition of paint particles. However, the coating head is usually locked by a large number of screws, which is not convenient for disassembly and assembly, and for accuracy. The amount or thickness of the output paint is controlled, and the screws that are locked on the coating head need to be adjusted by precise means. Therefore, the practice of regularly disassembling the coating head will face tedious and difficult disassembly and assembly procedures, and it is usually difficult to be able to disassemble the coating head. The coating head is assembled back to the required precision.

Therefore, the development of a slit coater that prevents coating particles from depositing in the shunt pipe is an urgently needed issue.

The present invention provides a slit-type applicator, which proposes a fundamental solution from the perspective of improvement of the shunt pipe, so as to avoid the problem of the deposition of paint particles in the shunt pipe.

According to a slit type applicator disclosed in the present invention, a coating head includes a first body and a second body. The second body is disposed on the first body. The first body has a first surface and is located on the A shunt pipe on the first surface. The second body has a second surface. The first surface and the second surface face each other to jointly form a coating slit. The deepest depth of one of the shunt pipes is D, and the gap value of one of the coating slits is G, which satisfies the following condition: 8>D/G>18.

The slit coater disclosed in the present invention can effectively reduce the coating particles in the shunt pipe by controlling the ratio (D/G) of the deepest depth of the shunt pipe to the gap value of the coating slit within the aforementioned range. Produce areas with relatively low speed, so as to improve the deposition of paint particles in the shunt pipe due to the slowdown, and to avoid the traditional coating head shunt pipe that often has paint particles settled, which causes the coating quality to drop and it is difficult to control the yield. And avoid the need to re-disassemble the coating head to clean the shunt pipe and other tedious procedures.

The above description of the disclosure of the present invention and the description of the following embodiments are used to demonstrate and explain the spirit and principle of the present invention, and to provide a further explanation of the scope of the patent application of the present invention.

The detailed features and advantages of the present invention will be described in detail in the following embodiments. The content is sufficient to enable anyone familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the scope of patent application and drawings. In this way, anyone who is familiar with the relevant art can easily understand the purpose and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention by any viewpoint.

In addition, the embodiments of the present invention will be disclosed in the following drawings. For clear description, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the present invention.

Moreover, for the purpose of neatness of the drawing, some conventionally used structures and elements may be drawn in a simple schematic manner in the drawing. In addition, some of the features in the drawings of this case may be slightly enlarged or their scales or sizes may be changed to achieve the purpose of facilitating the understanding and viewing of the technical features of the present invention, but this is not intended to limit the present invention. The actual size and specifications of the product manufactured in accordance with the content disclosed in the present invention should be adjusted according to the requirements during production, the characteristics of the product itself, and the content disclosed in the following in conjunction with the present invention, and it is hereby stated.

In addition, the terms "end", "part", "part", "area", "location" and other terms may be used in the following text to describe specific elements and structures or specific technical features on or between them, but these elements And structure is not limited by these terms. In the following, the term "and/or" may also be used, which refers to a combination of one or all of one or more of the listed related elements or structures. In the following text, terms such as "substantially", "substantially", "about" or "approximately" may also be used. When used in combination with a range of size, concentration, temperature, or other physical or chemical properties or characteristics, it is intended to cover possible Deviations in the upper and/or lower limits of the range of these properties or characteristics may indicate allowable manufacturing tolerances or acceptable deviations caused by the analysis process, but the expected results can still be achieved.

Furthermore, unless otherwise defined, all vocabulary or terms used herein, including technical and scientific vocabulary and terms, have their usual meanings, and their meanings can be understood by those familiar with this technical field. Furthermore, the above-mentioned definitions of vocabulary or terms should be interpreted as having the same meaning in the technical field related to the present invention in this specification. Unless there is a clear definition, these words or terms will not be interpreted as too ideal or formal meaning.

First of all, the present invention proposes a slit coater 1a, as shown in Figs. 1 to 3. Fig. 1 is a perspective schematic view of the slit coater 1a according to an embodiment of the present invention when it is opened, and Fig. 2 is a diagram. 1 is an exploded schematic view of the slit type applicator 1a, and FIG. 3 is a schematic side sectional view of the slit type applicator 1a of FIG. 1 when it is closed. In this embodiment or other embodiments, the slit coater 1a includes a slot die or slot die head 10. The slit coater described here may also be referred to as "Coating head".

The coating head 10 includes a first body 110 and a second body 120, and the second body 120 can be disposed on the first body 110. For example, the second body 120 can be pivoted on one side of the first body 110 through a pivot (not numbered), so as to pivot relative to the first body 110 to cover the first body 110, and then pass through Screws or other suitable fixing members (not shown) fix the first body 110 and the second body 120 in position. However, the present invention is not limited to the connection between the first body and the second body of the coating head. For example, in other embodiments, the first body and the second body of the coating head can also be pivoted in other suitable ways. Assuming, or in other embodiments, the second body of the coating head can also be installed on the first body only by screws and other suitable fixing members.

Looking further, in this embodiment or other embodiments, the first body 110 has a first surface 111 and the second body 120 has a second surface 121. 3, when the second body 120 is closed on the first body 110, that is, when the second body 120 is disposed on the first body 110, the second surface 121 of the second body 120 faces the first surface of the first body 110 111. It can also be said that the second surface 121 of the second body 120 and the first surface 111 of the first body 110 face each other. At this time, a coating slit 130 and a discharge opening O are formed between the first surface 111 and the second surface 121 together to allow the coating slit 130 to communicate with the outside. The coating slit 130 is one of the ways for conveying paint in the coating head 10, and the discharge opening O is an outlet in the coating head 10 through which the paint is extruded out. It should be stated that the size of the coating slit 130 and the discharge opening O described here can be adjusted, for example, by adjusting the screws (not shown) that lock the first body 110 and the second body 120. However, the present invention is not limited to this.

Looking further, in this embodiment or other embodiments, the first body 110 has a first lip 114 at an end close to the discharge opening O, and the second body 120 has a second lip at an end close to the discharge opening O. The shapes of the portion 122, the first lip portion 114 and the second lip portion 122 are slightly wedge-shaped, so that one end of the coating head 10 with the discharge opening O forms a tapered shape. However, it should be stated that the present invention is not limited to the shape of the first lip 114 and the second lip 122. For example, in some other embodiments, the shape of the first lip and the second lip of the coating head can be Adjust to other shapes according to actual coating requirements.

In addition, as shown in FIGS. 1 to 3, in this embodiment or other embodiments, the first body 110 further has a first branch pipe 112 and a second branch pipe 113 on the first surface 111. In terms of relative position, the first branch pipe 112 and the second branch pipe 113 are separated by a partition 115, and the first branch pipe 112 is closer to the first body 110 and the second body 120 than the second branch pipe 113. Discharge opening O between the middle, so it is understandable that the first branch pipe 112 is closer to the discharge position of the coating head 10 and can be regarded as the outer branch pipe of the coating head 10, and the second branch pipe 113 can be regarded as the coating head 10 The internal shunt pipe of the head 10. It is supplemented that the distance between the first branch pipe 112 and the second branch pipe 113 (that is, the width of the partition 115) and the distance between it and the discharge opening O can be adjusted according to actual requirements. The present invention There are no special restrictions. In addition, as for the second shunt pipe 113, the shape, size and volume of the second shunt pipe 113 can be adjusted according to actual requirements, and the present invention is not particularly limited.

In terms of design, the lengths of the first shunt pipe 112 and the second shunt pipe 113 are substantially equal to the maximum dischargeable width that the coating head 10 can support, but the present invention is not limited to this. The length of the first branch pipe and the second branch pipe referred to here refers to the length of the long side of the first branch pipe and the second branch pipe. In this embodiment, the lengths of the first branch pipe 112 and the second branch pipe 113 are substantially the same, but the present invention is not limited to this; for example, in some embodiments, the length of the first branch pipe and the second branch pipe The length can also be changed to be different.

In this embodiment or other embodiments, the first body 110 further has a feeding port F connected to the second shunt pipe 113. The paint injection port F can be connected to a paint source (not shown) to inject paint into the second branch pipe 113. When the second body 120 is closed on the first body 110, the paint can be injected into the second shunt pipe 113 from the paint injection port F, cross the partition 115 and enter the first shunt pipe 112, and then flow into the first shunt pipe 112 The coating slit 130 can be squeezed out of the coating head 10 from the coating slit 130 from the discharge opening O.

In addition, in this embodiment or other embodiments, the slit-type applicator 1a may, but is not limited to, be equipped with a shim or shim plate 20. The clip 20 can be disposed on the first surface 111 of the first body 110. The clip 20 can be fixed to the coating head 10 by screw locking or other suitable methods, but the present invention is not limited to this, and to achieve a clean surface, the drawings are omitted and the screws for locking the clip are not shown. . When the second body 120 is closed on the first body 110, the clip 20 can be clamped together with the first body 110. In this embodiment, the clip 20 is approximately in the shape of a letter or C, and one of its functions is to be assembled on the coating head 10 to change the coating width of the coating head 10. Specifically, as shown in FIGS. 1 and 2, when the clip 20 can be placed on the first surface 111 of the first body 110, the clip 20 can cover a portion of the first shunt pipe 112 and the second shunt pipe 113, thereby changing from The width of the paint flowing out of the first branch pipe 112 and the second branch pipe 113.

Here, please continue to refer to Figure 4. Figure 4 is a partial enlarged perspective view of the slit-type applicator 1a of Figure 1 in use. The arrows indicate the flow direction and trend of the paint, and in order to facilitate the observation of the flow of the paint, The second body 120 is omitted and not shown in FIG. 4. As shown in the figure, the paint in the second shunt pipe 113 can cross the partition 115 to enter the first shunt pipe 112, and then flow out from the first shunt pipe 112 to the outside, but because the clip 20 shields part of the first shunt pipe 112 and the second shunt pipe 113, therefore, the coating width that finally flows out of the tube becomes narrower.

It should be supplemented that the thickness of the aforementioned clip can be selected according to differences such as the size of the coating slit 130, and the present invention is not limited to this. In addition, the clip can be, but is not limited to, made of materials such as plastic or metal, and the present invention is not particularly limited. In addition, the shape design of the clip can be adjusted according to actual needs, such as the required coating width. Even in some cases where the coating width does not need to be adjusted, the coating head can also be omitted without any clip.

It is worth noting that, in order to avoid the problem of paint deposition or deposition due to the decrease in the flow rate at the shunt pipe during the output process. The present invention is particularly aimed at improving the shape of the shunt pipe of the coating head.

Take the slit coater 1a of the foregoing embodiment as an example for description. Please continue to refer to FIG. 5. FIG. 5 is a partial enlarged schematic view of the portion of the slit coater 10 in FIG. 3 for the first shunt pipe 112. In this embodiment, the first body 110 also has a feeding material Surface 1121, a groove bottom surface 1122, and a discharge surface 1123. The groove bottom surface 1122 is connected between the inlet surface 1121 and the discharge surface 1123, so that the inlet surface 1121, the groove bottom surface 1122 and the discharge surface 1123 together constitute a first branch flow Tube 112, wherein the feed surface 1121 is located at one side of the first branch pipe 112 relatively far away from the discharge opening O, and the discharge surface 1123 is opposite to the feed surface 1121 and is located at one of the first branch pipe 112 relatively close to the discharge opening O side. In this embodiment and other embodiments, the inlet surface 1121, the groove bottom surface 1122, and the outlet surface 1123 are all flat surfaces, so that the shape of the first shunt pipe 112 is slightly trapezoidal. In addition, in this embodiment or other embodiments, the distance from the groove bottom surface 1122 to a plane P of the first surface 111 of the first body 110 can be regarded as the deepest depth D of the first shunt 112, and the distance between the first body 110 The coating slit 130 between the first surface 111 and the second surface 121 of the second body 120 has a gap value G. In addition, in this embodiment and other embodiments, a feeding angle θ1 is sandwiched between the feeding surface 1121 of the first body 110 and a plane P where the first surface 111 of the first body 110 is located, in other words, The angle between the side of the first shunt pipe 112 away from the discharge opening O and the plane P where the first surface 111 is located is defined as the feed angle θ1. On the other hand, the discharge surface 1123 of the first body 110 is A discharge angle θ2 is sandwiched between the plane P where the first surface 111 of the first body 110 is located. In other words, the side of the first shunt pipe 112 close to the discharge opening O and the plane P where the first surface 111 is located The angle between them is defined as the discharge angle θ2. Correspondingly, the included angle between the inlet surface 1121 and the groove bottom surface 1122 can be regarded as the opening θ3 of the corner of the first shunt pipe 112 farther from the discharge opening O, and the included angle between the discharge surface 1123 and the groove bottom surface 1122 can be seen Is the opening θ4 of the corner of the first shunt pipe 112 closer to the discharge opening O.

It should be supplemented that although in this embodiment, the inlet surface 1121, the groove bottom surface 1122, and the discharge surface 1123 of the first shunt pipe 112 are all flat and form an approximate trapezoidal geometric shape, the present invention is not based on this. For example, in other embodiments, due to manufacturing factors or other requirements, at least one or all of the inlet surface 1121, the bottom surface of the groove 1122, and the outlet surface 1123 may be changed to a curved surface. In this case, in some embodiments, the inlet surface 1121 and the discharge surface 1123 of the first branch pipe 112 can maintain a flat surface, and only the bottom surface 1122 of the groove is changed to a curved surface, or the inlet surface of the first branch pipe 112 1121, the discharge surface 1123 and the groove bottom surface 1122 can all be changed to curved surfaces. In addition, the feed surface 1121, the bottom surface 1122 of the groove, and the discharge surface 1123 may be connected with rounded corners or other forms of curved surfaces or planes, and the present invention is not limited to this.

In this embodiment and other embodiments, when the aforementioned deepest depth D and gap value G satisfy 8>D/G>18, the low velocity area of the coating particles in the shunt pipe can be effectively reduced to the depth of the shunt pipe The percentage is less than 10% to suppress the size of the low-velocity area of the coating particles in the shunt pipe, so that the paint particles can be maintained at a certain flow rate in most areas of the shunt pipe, thereby reducing the particle deposition of the paint particles due to the drop in the flow rate. Probability. The depth percentage of the shunt pipe mentioned here, especially refers to the depth of the low-velocity zone in the shunt pipe or the proportion of the deepest depth to the deepest depth of the shunt pipe, so it can be regarded as judging the range of paint particles in the low-velocity zone in the shunt pipe The size index, the lower the percentage value, the smaller the range of the low-velocity zone in the shunt pipe. In some embodiments, when the deepest depth D and the gap value G satisfy 8.333>D/G>17.32, the low-velocity area of the coating particles can be further reduced.

Here, please refer to the following table 1. Table 1 shows the results of the flow field simulation experiment of the first shunt pipe that meets 8>D/G>18 and the shunt pipe that does not meet 8>D/G>18, except for D/ In addition to the different G values, the shunt pipes of each group are, for example, similar to the geometric configuration of the shunt pipe of the slit coater 1a in the foregoing embodiment, and these shunt pipes are made of the same paint material and the wet film thickness is about The flow field simulation is performed under the same conditions as 160μm, the width of the shunt tube is about 4cm, the rheological model (power-law model) n is about 0.6987, and the Power-law K value (cps*s^n) is about 11514. Among them, The angles of each group of inlet and outlet angles are only one of the choices for the convenience of the experiment in Table 1. The present invention is not limited to the inlet and outlet angles for the experiment in Table 1. The subsequent paragraphs will deal with different The inlet angle and the outlet angle are explained. In addition, the experimental simulation in Table 1 is based on the ratio of the low-velocity area formed by the paint particles with a lower velocity to the depth of the shunt pipe as the basis for determining the degree of paint particle deposition.

Table I

Table I Group Coating speed (m/min) Feed angle (°) Discharge angle (°) D(cm) G(μm) D/G value Percentage of low-velocity area in the depth of the shunt pipe (%) Comparison group 1 25 30 30 0.866 300 28.867 12.93 Comparison group 2 25 30 30 0.866 400 21.65 10.21 Comparison group 3 25 45 45 0.866 300 28.867 16.81 Comparison group 4 25 45 45 0.866 400 21.65 12.76 Control group 1 25 30 30 0.866 500 17.32 7.74 Control group 2 25 30 30 0.866 600 14.433 6.52 Control group 3 25 30 30 0.866 700 12.371 6.36 Control group 4 25 30 30 0.866 800 10.825 5.35 Control group 5 100 30 30 0.866 800 10.825 5.35 Control group 6 120 30 30 0.866 800 10.825 5.35 Control group 7 100 45 45 0.866 600 14.433 8.55 Control group 8 100 45 45 0.866 700 12.371 6.36 Control group 9 100 45 45 0.866 800 10.825 5.35 Control group 10 100 45 45 0.866 1200 7.2167 4.30 Control group 11 120 45 45 0.866 800 10.825 5.35 Control group 12 100 45 45 1 600 16.667 9.30 Control group 13 100 45 45 1 700 14.286 8.45 Control group 14 100 45 45 1 800 12.5 7.45 Control group 15 100 45 45 1 1200 8.3333 5.09 Control group 16 120 45 45 1 800 12.5 7.45 Control group 17 120 75 75 1 800 12.5 6.35 Control group 18 120 60 60 1 800 12.5 6.35 Control group 19 120 30 75 0.866 800 10.825 5.35 Control group 20 120 75 30 0.866 800 10.825 5.35 Control group 21 120 45 75 0.866 800 10.825 5.35 Control group 22 120 75 45 0.866 800 10.825 5.35

It can be seen from Table 1, if the comparison group 1~2 and the control group 2~4, when the coating speed is the same and the experimental conditions such as the feed angle and the discharge angle are the same, when the D/G of the shunt tube meets 8 >D/G>18, the percentage of the depth of the shunt tube in the low flow rate area can be effectively reduced to a level far below 10%. For example, from the experimental results of other control groups, whether the coating flow rate is from 25m/min Increase to 120m/min, or under different feed angles and discharge angles, etc., as long as the D/G of the shunt pipe meets 8>D/G>18, the low flow rate area of the coating can be within these operating factors. Within the range of variation, it can be effectively suppressed below 10% of the depth percentage of the shunt pipe. As shown in Table 1, when the D/G of the shunt pipe is between 8.333 and 17.32, it can effectively reduce the phenomenon of paint particles settling at a low flow rate in the shunt pipe.

In addition, it is added that, in fact, in addition to the aforementioned control group, as long as the shunt pipe meets the aforementioned conditions of D/G, the range of the inlet and outlet angles of the shunt pipe is between 30 and 90 degrees. Both can effectively reduce the sedimentation of paint particles at low flow rates in the shunt pipe. For example, in some variations of this embodiment, the first shunt pipe 112 that satisfies the aforementioned conditions of D/G may have an inlet angle θ1 of approximately 90 degrees, and a discharge angle θ2 of approximately 60 degrees. In this configuration, the low-velocity area of the paint can still be effectively suppressed to a level below 10% of the depth percentage of the shunt pipe; in other cases of this embodiment, the first shunt pipe that satisfies the aforementioned conditions of D/G The inlet angle θ1 and the outlet angle θ2 of 112 can be approximately 60 degrees and 45 degrees, 60 degrees and 30 degrees, or any combination of the foregoing angles, regardless of whether the first shunt pipe 112 is symmetrical on both sides from the side view. The approximate trapezoid shape or the quadrilateral with asymmetrical angles on both sides, the paint can be effectively suppressed in the low-velocity area of the first shunt pipe 112 below 10% of the depth percentage of the shunt pipe. In other words, under the premise that the shunt pipe meets the aforementioned conditions of D/G, the inlet angle of the shunt pipe can be approximately between 30 and 90 degrees, and the discharge angle can also be approximately between 30 and 90. Furthermore, the inlet angle of the shunt pipe can be approximately between 30 and 60 degrees, and the outlet angle can be approximately between 30 and 60 degrees.

Corresponding to the geometric configuration of the first shunt pipe 112 of this embodiment, it is understandable that the opening angle θ3 of the corner of the first shunt pipe 112 close to the feed angle θ1 can be approximately between 90 and 150 degrees. The opening θ4 of the corner of the first shunt pipe 112 close to the discharge angle θ2 can also be approximately between 90 and 150 degrees, and further, the opening θ3 can be approximately between 120 and 150 degrees. The degree θ4 may be approximately between 120 and 150.

With the aforementioned slit coater of the present invention, the ratio (D/G) of the deepest depth of the shunt pipe to the gap value of the coating slit is controlled within the range of 8>D/G>18, or even further The ground control is within the range of 8.333>D/G>17.32, which can effectively improve the relatively small area where the coating particles generate in the shunt pipe, thereby improving the problem of coating particles depositing in the shunt pipe, and avoiding the traditional coating The shunt pipe of the head often has problems such as coating quality degradation due to the sedimentation of coating particles, difficulty in controlling the yield, and cumbersome procedures such as the need to re-disassemble the coating head to clean the shunt pipe.

Although the present invention is disclosed in the foregoing embodiments, it is not intended to limit the present invention. All changes and modifications made without departing from the spirit and scope of the present invention fall within the scope of the patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the attached scope of patent application.

1a: slit coater 10: Coating head 20: Clip 110: The first subject 111: first surface 112: The first shunt 113: The second shunt 114: first lip 115: divider 120: The second subject 121: second surface 122: second lip 130: Coating slit 1121: Feeding surface 1122: groove bottom 1123: discharge surface D: deepest depth F: Paint injection port G: gap value O: opening P: Reference plane θ1: Feed angle θ2: discharge angle θ3, θ4: opening degree

FIG. 1 is a three-dimensional schematic diagram of a slit coater according to an embodiment of the present invention when it is opened. Fig. 2 is an exploded schematic diagram of the slit coater of Fig. 1. Fig. 3 is a schematic side sectional view of the slit-type applicator of Fig. 1 when it is closed. Fig. 4 is a partial enlarged perspective view of the slit coater of Fig. 1 when in use. FIG. 5 is a partial enlarged schematic diagram of the slit coater of FIG. 3. FIG.

1a: slit coater

10: Coating head

110: The first subject

111: first surface

112: The first shunt

114: first lip

115: divider

120: The second subject

121: second surface

122: second lip

130: Coating slit

1121: Feeding surface

1122: groove bottom

1123: discharge surface

D: deepest depth

G: gap value

O: opening

P: Reference plane

θ1: Feed angle

θ2: discharge angle

θ3, θ4: opening degree

Claims (14)

A slit type applicator, comprising: a coating head comprising a first body and a second body, the second body is arranged on the first body, the first body has a first surface and is located on the first body A shunt pipe on a surface, the second body has a second surface, the first surface and the second surface face each other to form a coating slit together, wherein one of the shunt pipes has a deepest depth D, The gap value of one of the coating slits is G, which satisfies the following condition: 8<D/G<18. The slit coater according to claim 1, wherein the deepest depth of the shunt pipe is D, and the gap value of the coating slit is G, which meets the following conditions: D/G=8.333-17.32. The slit coater according to claim 1, wherein a discharge opening communicating with the coating slit is formed between the first surface of the first body and the second surface of the second body, the The included angle between the side of the shunt pipe away from the discharge opening and a reference plane where the first surface of the first body is located is defined as an inlet angle, and the inlet angle is between 30 and 90 degrees. The slit coater according to claim 3, wherein the feed angle is between 30 and 60 degrees. The slit coater according to claim 1, wherein a discharge opening communicating with the coating slit is formed between the first surface of the first body and the second surface of the second body, the The included angle between the side of the shunt pipe close to the discharge opening and a reference plane where the first surface of the first body is located is defined as a discharge angle, and the discharge angle is between 30 and 90 degrees. The slit coater according to claim 5, wherein the discharge angle is between 30 and 60 degrees. The slit coater according to claim 1, wherein the gap value G of the coating slit is between 100 μm and 1200 μm. The slit coater according to claim 1, wherein a discharge opening communicating with the coating slit is formed between the first surface of the first body and the second surface of the second body, the An opening of the corner of the shunt pipe away from the discharge opening is between 120 and 150 degrees. The slit coater according to claim 1, wherein a discharge opening communicating with the coating slit is formed between the first surface of the first body and the second surface of the second body, the An opening of the shunt pipe near the corner of the discharge opening is between 120 and 150 degrees. The slit coater according to claim 1, wherein the shape of the shunt pipe is slightly trapezoidal. The slit coater according to claim 1, wherein the first body has an inlet surface, an outlet surface, and a bottom surface of a groove connected between the inlet surface and the outlet surface, and the inlet The material surface, the discharge surface and the bottom surface of the tank form the shunt pipe, and the material input surface, the discharge surface and the bottom surface of the tank are all flat surfaces. The slit coater according to claim 1, wherein the first body has an inlet surface, an outlet surface, and a bottom surface of a groove connected between the inlet surface and the outlet surface, and the inlet The material surface, the discharge surface and the bottom surface of the groove form the shunt pipe, the input surface and the discharge surface are flat, and the bottom surface of the groove is a curved surface. The slit coater according to claim 1, wherein the first body has an inlet surface, an outlet surface, and a bottom surface of a groove connected between the inlet surface and the outlet surface, and the inlet The material surface, the material discharge surface and the bottom surface of the groove form the shunt pipe, and the material input surface, the material discharge surface and the bottom surface of the groove are all curved surfaces. The slit coater according to claim 1, wherein the first body further has another shunt pipe, and the shunt pipe is between a first lip and the other shunt pipe.

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