Coating head mold

Abstract

The invention discloses a coating head mold. The coating head mold comprises an upper mold plate, a lower mold plate and a spacing piece. The upper die plate extends in the first direction and the second direction, the extending distance of the upper die plate in the first direction is larger than the extending distance of the upper die plate in the second direction, and the first direction is perpendicular to the second direction. And the lower template is arranged below the upper template. And the spacing piece is arranged between the upper template and the lower template. Space among the upper die plate, the lower die plate and the spacing piece forms a flow dividing pipe, the flow dividing pipe has depth in the third direction, and the third direction is perpendicular to the first direction and the second direction. The width of the flow dividing pipe in the second direction is W, the depth of the flow dividing pipe in the third direction is DE, and W / DE is larger than or equal to 5.

Description

Technical Field

[0001] This invention relates to coating molds, and more particularly to coating head molds. Background Technology

[0002] Generally, a coating head mold includes an upper template, a spacer, and a lower template, and the space between the upper template, spacer, and lower template can form a flow channel. When using a slurry containing particles for coating, current coating head molds may have the problem of slurry particle deposition, so the structure of the coating head mold still needs further improvement. Summary of the Invention

[0003] This invention addresses the issue of slurry particle deposition by improving the shape of the manifold.

[0004] According to some embodiments, the present invention provides a coating head mold. The coating head mold includes an upper template, a lower template, and a spacer. The upper template extends along a first direction and a second direction, the extension distance of the upper template in the first direction being greater than the extension distance of the upper template in the second direction, and the first direction being perpendicular to the second direction. The lower template is disposed below the upper template. The spacer is disposed between the upper template and the lower template. The spacer forms a flow divider tube in the space between the upper template, the lower template, and the spacer. The flow divider tube has a depth in a third direction, which is perpendicular to the first and second directions. The width of the flow divider tube in the second direction is W, and the depth in the third direction is DE, where W / DE ≥ 5.

[0005] To provide a better understanding of the above and other aspects of the present invention, specific embodiments are described below in conjunction with the accompanying drawings: Attached Figure Description

[0006] Figure 1 This is an exploded view of a coating head mold according to an embodiment of the present invention;

[0007] Figure 2A This is a perspective view of a coating head mold according to another embodiment of the present invention;

[0008] Figure 2B for Figure 2A Exploded view of the coating head mold;

[0009] Figure 3A for Figure 1 A cross-sectional view of the coating head mold;

[0010] Figure 3B for Figure 1 A cross-sectional view of the distributor tube of the coating head mold;

[0011] Figure 3C for Figure 1 A simulation diagram of the strain rate inside the manifold of the coating head mold;

[0012] Figure 3D This is a cross-sectional view of a shunt tube according to a comparative example of the present invention;

[0013] Figure 4A This is a cross-sectional view of a coating head mold according to another embodiment of the present invention;

[0014] Figure 4B for Figure 4A A cross-sectional view of the distributor tube of the coating head mold;

[0015] Figure 5A This is a cross-sectional view of a coating head mold according to a comparative example of the present invention;

[0016] Figure 5B for Figure 5A A simulation diagram of the strain rate inside the manifold of the coating head mold;

[0017] Figure 6 A cross-sectional view of a coating head mold of another comparative example of the present invention; and

[0018] Figure 7 This is a cross-sectional view of a coating head mold, which is another comparative example of the present invention.

[0019] Symbol Explanation

[0020] 10, 10', 20~50: Coating head mold

[0021] 110,210: Template

[0022] 122, 122', 322~622: Diverter pipe

[0023] 122p,122p': Position

[0024] 122s,122s': Pipe wall

[0025] 122t, 124t: Top surface

[0026] 124: Slit

[0027] 130, 230: Spacer

[0028] 130h: Opening

[0029] 150, 150', 250~550: Lower Template

[0030] 150h, 210h: Groove

[0031] A1, A2, A11, A11', A12, A12': Cross-sectional area

[0032] D1: First Direction

[0033] D2: Second Direction

[0034] D3: Third direction

[0035] DE, DE1~DE4: Depth

[0036] GR: Gravity

[0037] MD: Direction of travel

[0038] PA: Movement Path

[0039] PP: particles

[0040] S1: Distance

[0041] W, W1~W4: Width

[0042] :angle Detailed Implementation

[0043] The following description, in conjunction with the accompanying drawings, details various embodiments. The description and drawings are provided for illustrative purposes only and are not intended to be limiting. For clarity, some elements and / or symbols may be omitted in some drawings. Furthermore, elements in the drawings may not be drawn to scale. It is anticipated that elements and features in one embodiment can be advantageously incorporated into another embodiment without further repetition.

[0044] Figure 1 An exploded view of a coating head mold 10 according to an embodiment of the present invention is shown. Figure 2A A perspective view of a coating head mold 20 according to another embodiment of the present invention is shown. Figure 2B Draw Figure 2A Exploded view of coating head mold 20. Figure 3A Draw Figure 1 A cross-sectional view of the coating head mold 10 (e.g., corresponding to the geometric center of the coating head mold 10). Figure 3B Draw Figure 1 A cross-sectional view of the distributor pipe 122 of the coating head mold 10. Figure 3C Draw Figure 1 The strain rate simulation diagram inside the diversion tube 122 of the coating head mold 10. Figure 3D A cross-sectional view of a shunt 622 according to a comparative example of the present invention is shown.

[0045] Please refer to Figure 1This invention provides a coating head mold 10. The coating head mold 10 includes an upper template 110, a lower template 150, and a spacer 130. The upper template 110 extends along a first direction D1 and a second direction D2, the extension distance of the upper template 110 in the first direction D1 being greater than the extension distance of the upper template 110 in the second direction D2, and the first direction D1 being perpendicular to the second direction D2. The lower template 150 is disposed below the upper template 110. The spacer 130 is disposed between the upper template 110 and the lower template 150. In this embodiment, the lower template 150 includes a groove 150h, which is formed on a surface of the lower template 150 adjacent to the upper template 110 for slurry flow (details described below). The upper template 110 does not include a groove for slurry flow; however, the invention is not limited thereto. In other embodiments, such as Figures 2A-2B As shown, the lower template 250 of the coating head mold 10 does not include a groove for providing slurry flow, while the upper template 210 includes a groove 210h formed on a surface of the upper template 210 adjacent to the lower template 250 for slurry flow. Similarly, a spacer 230 is disposed between the upper template 210 and the lower template 250.

[0046] like Figure 1 and Figure 3A As shown, the space (cavity) between the upper template 110, the lower template 150, and the spacer 130 forms a diversion pipe 122. That is, the groove 150h in the lower template 150 corresponds to the diversion pipe 122. In other embodiments, such as... Figures 2A-2B As shown, the groove 210h in the upper template 210 corresponds to the diversion pipe 122 (not shown).

[0047] Please refer to the following at the same time Figure 1 and Figure 3AThe lower template 150 includes an inlet (not shown) and a groove 150h, which are interconnected. The inlet (not shown) provides the coating slurry into the groove 150h. A spacer 130 separates the upper template 110 and the lower template 150 into a slit 124, which serves as the outlet for the slurry flow. The spacer 130 has an opening 130h, giving it a U-shaped overall structure. The opening 130h corresponds to the groove 150h. The opening 130h of the spacer 130 is located between the upper template 110 and the lower template 150, further forming the slit 124 within the space between the upper template 110, the lower template 150, and the spacer 130. The cross-sectional area of ​​the diverter 122 is larger than the cross-sectional area of ​​the slit 124. The width of the opening 130h of the spacer 130 in the first direction D1 affects the width of the diversion pipe 122 in the first direction D1, and the depth of the spacer 130 in the third direction D3 affects the depth of the slit 124 in the third direction D3. The diversion pipe 122 and the slit 124 are interconnected to allow the coating slurry to flow. After the slurry enters the diversion pipe 122 from the inlet (not shown), it exits through the slit 124, for example, by coating the slurry onto a substrate.

[0048] like Figure 3A As shown, the diverter 122 has a depth DE1 in a third direction D3, which is perpendicular to the first direction D1 and the second direction D2. According to some embodiments, the width of the diverter 122 in the second direction D2 is W (W=W1 in this embodiment), and the depth in the third direction D3 is DE (DE=DE1 in this embodiment), and W / DE≥5. Furthermore, the depth DE of the diverter 122 in the third direction D3 is equal to or less than 6 mm (DE≤6 mm). In this embodiment, the top surface 122t of the diverter 122 is flush with the top surface 124t of the slit 124, and the depth DE represents the depth of the diverter 122 that is equal to or less than the height of the top surface 124t in the third direction D3; however, the invention is not limited thereto.

[0049] In such Figure 3B In the cross-sectional view shown, the cross-sectional area between the pipe wall 122s of the diverter 122 and the position 122p 1 mm away from the pipe wall 122s is A1 (A1=A11 in this embodiment). That is, the distance S1 between the pipe wall 122s and the position 122p is 1 mm. The cross-sectional area corresponding to the pipe wall 122s of the diverter 122 is A2 (A2=A12 in this embodiment), and A1 / A2≥36%.

[0050] Typically, to achieve uniform coating distribution and stable coating, the coating head die has a large cross-sectional area distribution tube and a very thin spacer. However, as... Figure 3DAs shown, when the slurry flows through this large cross-sectional area manifold 622, if the slurry flow rate is too slow, the particles PP in the slurry are easily affected by gravity GR and deposit (for example, particles PP deviate from their original direction of travel MD and deposit at the bottom of the manifold 622, as shown by the movement path PA of particles PP). In particular, the higher the particle density in the slurry, the more severe the deposition becomes. The particle deposition phenomenon causes a change in the particle concentration of the slurry flowing through the manifold, which in turn changes the uniformity of the coating film at the coating head mold outlet. It is often necessary to stop the machine to remove the deposited particles in order to restore the manifold, which is blocked by particles, to its initial state.

[0051] Therefore, in order to further improve the situation of particle settling at the bottom of the diversion tube, some embodiments of the present invention improve the shape of the diversion tube 122 (e.g., the shape in the cross-sectional view). For example, since the shape of the diversion tube 122 in this embodiment is approximately rectangular to meet the following conditions, a high-shear flow channel for the slurry can be provided, which significantly improves the slurry particle deposition: A1 / A2≥36%, W / DE≥5, and DE≤6 mm.

[0052] Please refer to Figure 3C The diagram shows the strain rate intensity profile in the manifold 122, with the X and Y axes in centimeters (cm). Because the bottom of the manifold 122 still has a high strain rate (e.g., 22.8–27.3), slurry particles are less likely to deposit at the bottom of the manifold 122.

[0053] According to this embodiment, the diverter 122 has an approximately rectangular shape in cross-sectional view; however, the present invention is not limited thereto. "Approximately rectangular" means that the four corners of the rectangle are not necessarily right angles (they can be chamfered or otherwise), and the two opposite sides of the rectangle are not necessarily perfectly parallel straight lines (they can be arc segments, oblique lines, or otherwise).

[0054] According to one embodiment (e.g., embodiment 2 in Table 1 below), the width W (i.e., W1) of the shunt tube 122 in the cross-sectional view (Figure 3) is 30 mm, the depth DE (i.e., DE1) is 6 mm, the slurry coating speed is 15 m / min, and the wet film thickness (i.e., the thickness of the substrate coating) is 80 mm. m, the particle size of the particles in the slurry is 10 m, the density of particles in the slurry is 4.2 g / cm³. 3The viscosity of the slurry is 2,950 cps. It should be understood that the present invention is not limited thereto. In Example 2, the width-to-depth ratio (W / DE) of the manifold 122 in the cross-sectional view is 5.00, and the cross-sectional area ratio (A1 / A2, i.e., A11 / A12) is 37.78%. Therefore, it meets the conditions of A1 / A2≥36%, W / DE≥5, and DE≤6 mm. The manifold 122 belongs to a high-shear flow channel. Experiments have confirmed that the coating head mold 10 according to Example 2 can produce continuously for 24 hours without stopping. There is no slurry particle deposition in the manifold 122. Due to the very uniform coating slurry, the resulting substrate coating is also quite uniform.

[0055] Figure 4A A cross-sectional view of a coating head mold 10' according to another embodiment of the present invention is shown (e.g., corresponding to the geometric center of the coating head mold 10'). Figure 4B Draw Figure 4A A cross-sectional view of the distributor tube 122' of the coating head mold 10'. Figure 4A The drawing of spacer 130 is omitted.

[0056] The difference between coating head mold 10' and coating head mold 10 is that the shape of the diversion tube 122' formed by the space between the upper template 110, the lower template 150' and the spacer 130 is different from the shape of the diversion tube 122. Other similar or identical parts will not be described in detail.

[0057] According to this embodiment, the diversion pipe 122' is shown in the cross-sectional view ( Figure 4A The shunt 122' has an approximately chordal shape, but the invention is not limited thereto. In the cross-sectional view, the width W in the second direction D2 is equal to W2, and the depth DE in the third direction D3 is equal to DE2, with a width-to-depth ratio W2 / DE2 ≥ 5 and DE2 ≤ 6 mm.

[0058] Please refer to Figure 4B The cross-sectional view shown shows that the cross-sectional area between the wall 122s' of the shunt pipe 122' and the position 122p' 1 mm away from the wall 122s' is A1 (A1 = A11' in this embodiment). That is, the distance S1 between the wall 122s' and the position 122p' is 1 mm. The cross-sectional area corresponding to the wall 122s' of the shunt pipe 122' is A2 (A2 = A12' in this embodiment).

[0059] According to one embodiment (e.g., embodiment 5 in Table 1 below), the shunt 122' in the cross-sectional view ( Figure 4A The width W (i.e., W2) in the sample is 30 mm, the depth DE (i.e., DE2) is 6 mm, the slurry coating speed is 9 m / min, and the wet film thickness (i.e., the thickness of the substrate coating) is 40 mm. m, the particle size of the particles in the slurry is 1 m, the density of particles in the slurry is 1.2 g / cm³. 3 The viscosity of the slurry is 1,000 cps. It should be understood that the present invention is not limited thereto. In Example 5, the width-to-depth ratio W / DE (i.e., W2 / DE2) of the manifold 122' in the cross-sectional view is 5.00, and the cross-sectional area ratio A1 / A2 (i.e., A11' / A12') is 46.11%. Therefore, it meets the conditions of A1 / A2≥36%, W / DE≥5, and DE≤6 mm. The manifold 122' belongs to a high-shear flow channel. Experiments have confirmed that the coating head mold 10' according to Example E can also be produced continuously without stopping the machine. There is no slurry particle deposition in the manifold 122'. Because the coating slurry is very uniform, the resulting substrate coating is also quite uniform.

[0060] Figure 5A A cross-sectional view of a coating head mold 30 according to a comparative example of the present invention is shown (e.g., corresponding to the geometric center of the coating head mold 30). Figure 5B Draw Figure 5A The strain rate simulation diagram of the distributor tube 322 of the coating head mold 30 is shown, where the units of the X-axis and Y-axis are both centimeters (cm). Figure 5A The drawing of spacer 130 is omitted.

[0061] The difference between coating head mold 30 and coating head mold 10 is that the shape of the diversion tube 322 formed by the space between the upper template 110, the lower template 350 and the spacer 130 is different from the shape of the diversion tube 122. Other similar or identical parts will not be described in detail.

[0062] According to this comparative example, in the cross-sectional view (…), the shunt pipe 322… Figure 5A It has an approximately teardrop-shaped appearance, with the included angle at the tip of this teardrop shape. Approximately 60 The width W of the shunt 322 is equal to W3, and the depth DE is equal to DE3.

[0063] According to a comparative example (e.g., Comparative Example 2 in Table 1 below), the shunt tube 322 in the cross-sectional view ( Figure 5A The width W (i.e., W3) in the slit 124 is 52.5 mm, and the depth DE (i.e., DE3) is 17.5 mm. Depth DE represents the depth of the portion of the shunt tube 322 that is equal to or less than the height of the top surface 124t of the slit 124 in the third direction D3, which can correspond to the radius of the teardrop shape. The slurry coating speed is 15 m / min, and the wet film thickness (i.e., the thickness of the substrate coating) is 80 mm. m, the particle size of the particles in the slurry is 10 m, the density of particles in the slurry is 4.2 g / cm³. 3The viscosity of the slurry was 2,950 cps. It should be understood that the present invention is not limited thereto. In Comparative Example 2, the width-to-depth ratio W / DE (i.e., W3 / DE3) of the manifold 322 in the cross-sectional view was 1.50, and the cross-sectional area ratio A1 / A2 was 21.55%. Therefore, it did not meet the conditions of A1 / A2≥36%, W / DE≥5, and DE≤6 mm, and the manifold 322 was not a high-shear flow channel. Experiments have confirmed that even though the manufacturing process conditions of Comparative Example 2 (e.g., slurry coating speed, film wet thickness, particle size, particle density, and viscosity) were the same as those of Example 2, the slurry was prone to particle deposition problems because the manifold 322 was not a high-shear flow channel. After one hour of use, the machine needed to be stopped for further production.

[0064] Depend on Figure 5B The strain rate simulation diagram of the manifold 322 also shows that the strain rate at the bottom of the manifold 322 is low (e.g., 0.72~0.89), and slurry particles are prone to deposit at the bottom of the manifold 322.

[0065] Figure 6 A cross-sectional view of a coating head mold 40 according to another comparative example of the present invention is shown (e.g., corresponding to the geometric center of the coating head mold 30), and the spacer 130 is omitted.

[0066] The difference between coating head mold 40 and coating head mold 10 is that the shape of the diversion tube 422 formed by the space between the upper template 110, the lower template 450 and the spacer 130 is different from the shape of the diversion tube 122. Other similar or identical parts will not be described in detail.

[0067] According to this comparative example, in the cross-sectional view (…), the shunt pipe 422… Figure 6 It has an approximately semi-circular shape. In the cross-sectional view, the width W of the shunt 422 is equal to W4, and the depth DE is equal to DE4.

[0068] According to a comparative example (e.g., Comparative Example 5 in Table 1 below), the shunt tube 322 in the cross-sectional view ( Figure 6 The width W (i.e., W4) in the figure is 40 mm, and the depth DE (i.e., DE4) is 20 mm. The depth DE corresponds to the radius of the semicircle. The slurry coating speed is 9 m / min, and the wet film thickness (i.e., the thickness of the substrate coating) is 40 mm. m, the particle size of the particles in the slurry is 1 m, the density of particles in the slurry is 1.2 g / cm³. 3The viscosity of the slurry is 1,000 cps. It should be understood that the present invention is not limited thereto. In Comparative Example 5, the width-to-depth ratio W / DE (i.e., W4 / DE4) of the manifold 422 in the cross-sectional view is 2, and the cross-sectional area ratio A1 / A2 is 19%. Therefore, it does not meet the conditions of A1 / A2≥36%, W / DE≥5, and DE≤6 mm, and the manifold 422 is not a high-shear flow channel. Experiments have confirmed that even if the manufacturing process conditions of Comparative Example 5 (e.g., slurry coating speed, film wet thickness, particle size, particle density, and viscosity) are the same as those of Example 5, the slurry is prone to particle deposition problems because the manifold 422 is not a high-shear flow channel. After a period of use, the machine needs to be shut down for treatment before subsequent production can proceed.

[0069] Table 1 below lists the cross-sectional conditions (depth DE, width W, width-to-depth ratio W / DE, and cross-sectional area ratio A1 / A2) of the manifolds according to some comparative examples and embodiments of the present invention, as well as the experimental results on whether they are high-shear flow channels. The difference between the comparative examples and embodiments lies in the shape and size of the manifold; other identical or similar parts will not be described in detail.

[0070] Table 1

[0071]

[0072]

[0073] As shown in Table 1, the shunt tubes of Comparative Examples 1-2 all have an approximately teardrop-shaped appearance in their cross-sectional views, for example, the same or similar to those in other examples. Figure 5A The shape of the shunt tube 322 is shown.

[0074] The shunts in Comparative Examples 3-4 all have an approximately teardrop-shaped profile in their cross-sectional views, for example, the same or similar to... Figure 7 The diagram shows the external shape of the shunt tube 522. Please refer to... Figure 7 The coating head mold 50 includes an upper template 110, a lower template 550, and a spacer 130 (not shown), and a diversion tube 522 is formed in the space between the upper template 110, the lower template 550, and the spacer 130 (not shown). The included angle of the semi-teardrop-shaped tip of the diversion tube 522 is... Approximately 45 .

[0075] The shunts in Comparative Examples 5 and 6 all have an approximately semi-circular shape in their cross-sectional views, for example, the same or similar. Figure 6 The shape of the shunt 422 is shown.

[0076] The shunt tubes in Examples 1-4 and Comparative Examples 7-8 all have an approximately rectangular shape in cross-sectional views, for example, the same or similar to... Figure 3A The shape of the shunt tube 122 shown.

[0077] The shunt tubes of Example 5 and Comparative Example 9 both have an approximately chordal shape in cross-sectional views, for example, the same or similar to... Figure 4A The shape of the shunt 122' shown.

[0078] Since Comparative Examples 1-9 do not meet the conditions of A1 / A2≥36%, W / DE≥5 and DE≤6 mm, the manifolds are not high shear rate channels. Therefore, particle deposition is more likely to occur at the bottom of the manifolds, which is less conducive to the formation of a uniform coating compared to Examples 1-5.

[0079] Please refer to Example 2 and Comparative Example 7, both of which have the same width W (30 mm) and a depth DE that differs by only 1 mm. However, even though the cross-section of the diverter in Comparative Example 7 has an approximately rectangular shape, it does not meet the conditions of A1 / A2≥36%, W / DE≥5, and DE≤6 mm. Therefore, the diverter is still not a high shear rate flow channel.

[0080] Please refer to Example 4 and Comparative Example 8, both of which have the same width W (50 mm) and a depth DE that differs by only 1 mm. However, even though the cross-section of the manifold in Comparative Example 8 has an approximately rectangular shape and meets the condition W / DE≥5, it still does not meet the conditions A1 / A2≥36% and DE≤6 mm. Therefore, the manifold is not considered a high shear rate flow channel. Thus, the values ​​of A1 / A2≥36% and DE≤6 mm play a crucial role in the shear rate within the manifold.

[0081] However, according to the experimental results, Comparative Example 8 still showed less particle sedimentation compared to Comparative Example 7. This shows that meeting the condition of W / DE≥5 can indeed increase the shear rate at the bottom of the splitter tube, which helps to improve the particle sedimentation situation.

[0082] Please refer to Example 5 and Comparative Example 9, both of which have the same width W (30 mm) and a depth DE that differs by only 1 mm. However, even though the cross-section of the manifold in Comparative Example 9 has an approximately chordal shape, the same width W as in Example 5, and meets the condition A1 / A2≥36%, it still does not meet the conditions W / DE≥5 and DE≤6 mm. Therefore, the manifold is still not a high shear rate flow channel. Thus, the values ​​of W / DE≥5 and DE≤6 mm play a crucial role in the shear rate within the manifold.

[0083] In summary, this invention provides an improved coating head mold. For example, by designing the cross-sectional shape of the manifold of the coating head mold (not limited to the shape described above), it is made to at least meet W / DE ≥ 5, thereby improving the particle settling of the slurry. Furthermore, when the condition of W / DE ≥ 5 is combined with the conditions of A1 / A2 ≥ 36% and DE ≤ 6 mm, the manifold of the coating head mold can become a high shear rate flow channel. When the manifold becomes a high shear rate flow channel, the coating liquid (slurry) with dispersed particles can be quickly distributed to achieve uniformity and stable flow out of the coating head mold for film formation. This reduces the residence time of the coating liquid (slurry) and avoids the phenomenon of particle settling due to gravity in the manifold. Therefore, the coating head mold of this invention can significantly improve the situation of slurry particles settling at the bottom of the manifold, allowing the coating head mold to produce continuously without downtime, greatly improving work efficiency, and the resulting coating slurry is very uniform, resulting in substrate coatings with excellent quality.

[0084] While the present invention has been disclosed above by way of embodiments, it is not intended to limit the invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of this invention should be defined by the appended claims.

Claims

1. A coating head mold, comprising: The upper template extends along a first direction and a second direction, wherein the extension distance of the upper template in the first direction is greater than the extension distance of the upper template in the second direction, and the first direction is perpendicular to the second direction; The lower template is set below the upper template; as well as A spacer is provided between the upper template and the lower template; The space between the upper template, the lower template and the spacer forms a diversion tube, which has a depth in a third direction, and the third direction is perpendicular to the first direction and the second direction. The width of the shunt in the second direction is W, and the depth in the third direction is DE, and W / DE ≥ 5.

2. The coating head mold as claimed in claim 1, wherein the depth of the diverter tube in the third direction is equal to or less than 6 mm.

3. The coating head mold as described in claim 1, wherein, In the cross-sectional view, the cross-sectional area between the wall of the shunt pipe and the position 1 mm away from the wall is A1, and the cross-sectional area of ​​the wall of the shunt pipe is A2, and A1 / A2≥36%.

4. The coating head mold as claimed in claim 1, wherein the groove in the lower template corresponds to the diversion pipe.

5. The coating head mold as claimed in claim 1, wherein the groove in the upper template corresponds to the diversion pipe.

6. The coating head mold as described in claim 1, wherein the space between the upper template, the lower template and the spacer further forms a slit, the diversion pipe is connected to the slit, and the slurry enters the diversion pipe and is discharged through the slit.

7. The coating head mold as claimed in claim 6, wherein the cross-sectional area of ​​the diverter tube is larger than the cross-sectional area of ​​the slit.

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