Coating die head

Abstract

To improve the problem of particle sedimentation in the slurry, the shape of the manifold will be improved. [Solution] The coating die head includes an upper die block, a lower die block, and a shim, extending along a first direction and a second direction perpendicular to the first direction. The extension distance of the upper die block in the first direction is greater than the extension distance of the upper die block in the second direction. The lower die block is positioned below the upper die block. The shim is positioned between the upper die block and the lower die block. The slot gap between the upper die block, the lower die block, and the shim forms a manifold. The manifold has depth in a third direction, and the third direction is perpendicular to the first and second directions. The width of the manifold in the second direction is W, and the depth of the manifold in the third direction is DE, with W / DE ≥ 5.

Description

Detailed Description of the Invention

[0001] (Technical Field) The present disclosure relates to a coating die head.

[0002] (Background) Generally, a coating die head includes an upper die block, a lower die block, and a shim, and a slot gap between the upper die block, the lower die block, and the shim forms a manifold. When coating a slurry containing particles, in the current coating die head, there may be problems with the precipitation of slurry particles, and it is necessary to further improve the structure of the coating die head.

[0003] Some solutions have been proposed in existing technical documents, such as the slit nozzle of the liquid coating device proposed in Patent Document 1.

[0004] (Existing Technical Documents) (Patent Documents) Patent Document 1: TWI714309 (Summary) The present disclosure is directed to improving the shape of the manifold in order to improve the problem of particle sedimentation in the slurry.

[0005] According to one embodiment, a coating die head is provided. The coating die head includes an upper die block, a lower die block, and a shim, extending along a first direction and a second direction perpendicular to the first direction. The extension distance of the upper die block in the first direction is greater than the extension distance of the upper die block in the second direction. The lower die block is positioned below the upper die block. The shim is positioned between the upper and lower die blocks. The slot gap between the upper die block, the lower die block, and the shim forms a manifold. The manifold has depth in a third direction, and the third direction is perpendicular to the first and second directions. The width of the manifold in the second direction is W, and the depth of the manifold in the third direction is DE, with W / DE ≥ 5.

[0006] (Brief explanation of the drawing) Figure 1 is an exploded perspective view of a coating die head according to one embodiment of the present disclosure.

[0007] Figure 2A is a perspective view of a coating die head according to another embodiment of the present disclosure.

[0008] Figure 2B is an exploded perspective view of the coating die head shown in Figure 2A.

[0009] Figure 3A is a cross-sectional view of the coating die head shown in Figure 1.

[0010] Figure 3B is a cross-sectional view of the manifold of the coating die head shown in Figure 1.

[0011] Figure 3C is a simulation diagram of the shear rate inside the manifold of the coating die head shown in Figure 1.

[0012] Figure 3D is a cross-sectional view of a manifold according to a comparative example of the present disclosure.

[0013] Figure 4A is a cross-sectional view of a coating die head according to another embodiment of the present disclosure.

[0014] Figure 4B is a cross-sectional view of the coating die head manifold shown in Figure 4A.

[0015] Figure 5A is a cross-sectional view of a coating die head according to a comparative example of the present disclosure.

[0016] Figure 5B is a simulation diagram of the shear rate inside the manifold of the coating die head shown in Figure 5A.

[0017] Figure 6 is a cross-sectional view of a coating die head according to another comparative example of the present disclosure.

[0018] Figure 7 is a cross-sectional view of a coating die head according to further comparative examples of the present disclosure.

[0019] The following detailed description includes numerous specific details to provide a complete understanding of the disclosed embodiments. However, it will be apparent that one or more embodiments may be carried out without these specific details. In other examples, well-known structures and apparatus are shown schematicly for the sake of simplicity in the drawings.

[0020] (Detailed explanation) Various embodiments will be described in more detail below with reference to the attached drawings. 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 actual scale. It is intended that elements and features in one embodiment can be advantageously incorporated into another embodiment without further description.

[0021] Figure 1 is an exploded perspective view of a coating die head 10 according to one embodiment of the present disclosure. Figure 2A is a perspective view of a coating die head 20 according to another embodiment of the present disclosure. Figure 2B shows an exploded perspective view of the coating die head 20 of Figure 2A. Figure 3A shows a cross-sectional view of the coating die head 10 of Figure 1 (for example, corresponding to the geometric center of the coating die head 10). Figure 3B shows a cross-sectional view of the manifold 122 of the coating die head 10 of Figure 1. Figure 3C shows a simulation diagram of the shear rate in the manifold 122 of the coating die head 10 of Figure 1. Figure 3D shows a cross-sectional view of the manifold 622 according to a comparative example of the present disclosure.

[0022] Referring to Figure 1, the present disclosure provides a coating die head 10. The coating die head 10 includes an upper die block 110, a lower die block 150, and a shim 130. The upper die block 110 extends along a first direction D1 and a second direction D2. The extension distance of the upper die block 110 in the first direction D1 is greater than the extension distance of the upper die block 110 in the second direction D2, and the first direction D1 is perpendicular to the second direction D2. The lower die block 150 is located below the upper die block 110. The shim 130 is located between the upper die block 110 and the lower die block 150. In this embodiment, the lower die block 150 includes a groove 150h. A groove 150h is formed on the surface of the lower die block 150 adjacent to the upper die block 110 to allow slurry to flow (details will be described later). The upper die block 110 does not include a groove for slurry flow, but the disclosure is not limited thereto. In other embodiments, as shown in Figures 2A and 2B, the lower die block 250 of the coating die head 10 does not include a groove for slurry flow, but the upper die block 210 includes a groove 210h formed on the surface of the upper die block 210 adjacent to the lower die block 250 for slurry flow. Similarly, a shim 230 is positioned between the upper die block 210 and the lower die block 250.

[0023] As shown in Figures 1 and 3A, the slot gap (cavity) between the upper die block 110, the lower die block 150, and the shim 130 forms the manifold 122. That is, the groove 150h of the lower die block 150 corresponds to the manifold 122. In other embodiments, as shown in Figures 2A-2B, the groove 210h of the upper die block 210 corresponds to the manifold 122 (not shown).

[0024] Refer to Figures 1 and 3A simultaneously. The lower die block 150 includes a supply port (not shown) and a groove 150h. The supply port (not shown) and the groove 150h are in communication with each other. The supply port (not shown) is used to supply coating slurry to the groove 150h. The shim 130 can separate the upper die block 110 and the lower die block 150 at a slit 124. The slit 124 is an outlet for the slurry to flow. Since the shim 130 has an opening 130h, it has a substantially U-shaped structure overall. The opening 130h corresponds to the groove 150h. The opening 130h of the shim 130 is located between the upper die block 110 and the lower die block 150, forming a slot gap between the upper die block 110, the lower die block 150 and the shim 130, and further forming the slit 124. The cross-sectional area of ​​the manifold 122 is larger than the cross-sectional area of ​​the slit 124. The width of the opening 130h of the shim 130 in the first direction D1 affects the width of the manifold 122 in the first direction D1, and the depth of the shim 130 in the third direction D3 affects the depth of the slit 124 in the third direction D3. The manifold 122 and the slit 124 are in communication and are used to allow the coating slurry to flow. The slurry enters the manifold 122 from a supply port (not shown) and is discharged through the slit 124, and for example, the slurry is coated onto a substrate.

[0025] As shown in FIG. 3A, the manifold 122 has a depth DE1 in a third direction D3 perpendicular to the first direction D1 and the second direction D2. According to some embodiments, the width of the manifold 122 in the second direction D2 is W (W = W1 in this embodiment), the depth in the third direction D3 is DE (DE = DE1 in this embodiment), and W / DE≧5. Further, the depth DE of the manifold 122 in the third direction D3 is 6 mm or less (DE≦6 mm). In this embodiment, the upper surface 122t of the manifold 122 is aligned with the upper surface 124t of the slit 124, and the depth DE represents the depth of the portion of the manifold 122 that is equal to or less than the height of the upper surface 124t in the third direction D3, but the present disclosure is not limited thereto.

[0026] In the cross-sectional view shown in FIG. 3B, let the corresponding cross-sectional area between the tube wall 122s of the manifold 122 and the position 122p that is 1 mm away from the tube wall 122s be A1 (A1 = A11 in this embodiment). That is, the distance S1 between the tube wall 122s and the position 122p is 1 mm. Also, the cross-sectional area corresponding to the tube wall 122s of the manifold 122 is A2 (A2 = A12 in this embodiment), and A1 / A2≧36%.

[0027] Generally, in order to achieve a uniform distribution and stable coating of the coating film, the coating die head has a manifold with a large cross-sectional area and a shim with a small thickness. However, as shown in FIG. 3D, when the slurry flows in the manifold 622 with a large cross-sectional area, if the flow rate of the slurry is too slow, the particles PP in the slurry are likely to settle under the influence of gravity GR (for example, as shown by the movement path PA of the particles PP, the particles PP deviate from the original movement direction MD and deposit at the bottom of the manifold 622). Especially when the particle density in the slurry is high, the deposition becomes more serious. Due to the particle deposition phenomenon, the particle concentration of the slurry flowing through the manifold changes, and the uniformity of the coating film at the outlet of the coating die head changes. In order to remove the deposited particles and return the manifold blocked by the particles to its original state, it is often necessary to stop the machine.

[0028] Therefore, in order to further improve the situation of particles deposited at the bottom of the manifold, in some embodiments of the present disclosure, the shape of the manifold 122 (such as the shape in the cross-sectional view) is improved. For example, the shape of the manifold 122 in the present embodiment is substantially rectangular so as to satisfy the following conditions: A1 / A2≥36%, W / DE≥5, and DE≤6 mm, so that a high shear rate flow path for the slurry can be provided, and the deposition of slurry particles can be significantly improved.

[0029] Please refer to FIG. 3C. This FIG. 3C is a contour diagram of the simulation of the shear rate strength in the manifold 122, and the units of both the X-axis and the Y-axis are centimeters (cm). Since the bottom of the manifold 122 still has a high shear rate (for example, 22.8 to 27.3), slurry particles are not likely to deposit at the bottom of the manifold 122.

[0030] According to the present embodiment, the manifold 122 has a substantially rectangular shape in the cross-sectional view, but the present disclosure is not limited thereto. "Substantially rectangular" means that the four corners of the rectangle are not necessarily right angles (they may be chamfered, etc.), the two opposite sides of the rectangle are not necessarily completely parallel straight lines (they may be arc lines, oblique lines, etc.), and the four corners of the rectangle are not necessarily right angles.

[0031] According to an embodiment (such as Embodiment 2 in Table 1 below), in the cross-sectional view (FIG. 3), the width W (i.e., W1) of the manifold 122 is 30 mm, the depth DE (i.e., DE1) is 6 mm, the coating speed of the slurry is 15 m / min, the wet film thickness (i.e., the thickness of the coating on the substrate) is 80 μm, the particle size of the particles in the slurry is 10 μm, and the density of the particles in the slurry is 4.2 g / cm 3The viscosity of the slurry is 2950 cps. It should be understood that this disclosure is not limited thereto. In Embodiment 2, the width-to-depth ratio W / DE in the cross-sectional view of the manifold 122 is 5.00, and the cross-sectional area ratio A1 / A2 (i.e., A11 / A12) is 37.78%, so the conditions A1 / A2≧36%, W / DE≧5, DE≦6mm can be satisfied, and the manifold 122 is a high shear rate flow path. Experiments have confirmed that the coating die head 10 according to Embodiment 2 can perform continuous production for 24 hours without interruption. No slurry particles accumulate in the manifold 122. Because the coating slurry is very uniform, the resulting substrate coating film is also fairly uniform.

[0032] Figure 4A shows a cross-sectional view of the coating die head 10' according to another embodiment of the present disclosure (for example, corresponding to the geometric center of the coating die head 10'). Figure 4B shows a cross-sectional view of the manifold 122' of the coating die head 10' in Figure 4A. In Figure 4A, the shim 130 is omitted from the illustration.

[0033] The difference between the coating die head 10' and the coating die head 10 lies in the shape of the manifold 122' formed by the slot gap between the upper die block 110, the lower die block 150', and the shim 130. Detailed explanations of other identical or similar parts are omitted.

[0034] According to this embodiment, the manifold 122' has a substantially chord-shaped appearance in cross-sectional view (Figure 4A), but the disclosure is not limited thereto. In cross-sectional view of the manifold 122', the width W in the second direction D2 is equal to W2, the depth DE in the third direction D3 is equal to DE2, and the width-to-depth ratio W2 / DE2 ≥ 5 and DE2 ≤ 6 mm.

[0035] Please refer to the cross-sectional view shown in Figure 4B. The corresponding cross-sectional area between the pipe wall 122s' of manifold 122' and a position 1 mm away from the pipe wall 122s', 122p', is A1 (in this embodiment, A1 = A11'). That is, the distance S1 between the pipe wall 122s' and position 122p' is 1 mm. Also, the cross-sectional area corresponding to the pipe wall 122s' of manifold 122' is A2 (in this embodiment, A2 = A12').

[0036] According to the embodiment (such as Embodiment 5 in Table 1 below), the width W (i.e., W2) of the manifold 122' in the cross-sectional view (Figure 4A) is 30 mm, the depth DE (i.e., DE2) is 6 mm, the slurry coating speed is 9 m / min, the wet film thickness (i.e., the thickness of the substrate coating) is 40 μm, the particle size in the slurry is 1 μm, and 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 this disclosure is not limited thereto. In Embodiment 5, the width / depth ratio W / DE (i.e., W2 / DE2) in cross-sectional view of the manifold 122' is 5.00 and the cross-sectional area ratio A1 / A2 (i.e., A11' / A12') is 46.11%, so Embodiment 5 can satisfy the conditions A1 / A2≧36%, W / DE≧5, DE≦6mm, and the manifold 122' is a high shear rate flow path. Experiments have confirmed that the coating die head 10' according to Embodiment E can also be continuously produced without stopping. No slurry particles accumulate in the manifold 122'. Because the coating slurry is very uniform, the resulting substrate coating film is also very uniform.

[0037] Figure 5A shows a cross-sectional view of the coating die head 30 according to a comparative example of the present disclosure (for example, a view corresponding to the geometric center of the coating die head 30). Figure 5B shows a simulation of the shear rate of the manifold 322 of the coating die head 30 in Figure 5A, with the units of the X and Y axes both being centimeters (cm). In Figure 5A, the shim 130 has been omitted from the illustration.

[0038] The difference between the coating die head 30 and the coating die head 10 is that the shape of the manifold 322, formed by the slot gap between the upper die block 110, the lower die block 350, and the shim 130, differs from the shape of the manifold 122. Detailed explanations of other identical or similar parts are omitted.

[0039] In this comparative example, the manifold 322 has a nearly teardrop shape in cross-sectional view (Figure 5A), and the angle α including the tip of the teardrop shape is approximately 60°. The width W of the manifold 322 is equal to W3, and the depth DE is equal to DE3.

[0040] According to comparative examples (such as Comparative Example 2 in Table 1 below), the width W (i.e., W3) of the manifold 322 in cross-sectional view (Figure 5A) is 52.5 mm, and the depth DE (i.e., DE3) is 17.5 mm. The depth DE represents the depth of the portion of the manifold 322 that is equal to or less than the height of the upper surface 124t of the slit 124 in the third direction D3, and can correspond to the radius of the teardrop shape. The slurry coating speed is 15 m / min, the wet film thickness (i.e., substrate coating thickness) is 80 μm, the particle size in the slurry is 10 μm, and the particle density in the slurry is 4.2 g / cm³. 3 The viscosity of the slurry is 2,950 cps. It should be understood that the disclosure is not limited to this. In Comparative Example 2, the width / depth ratio W / DE (i.e., W3 / DE3) of the manifold 322 in the cross-sectional view is 1.50, and the cross-sectional area ratio A1 / A2 is 21.55%. Therefore, Comparative Example 2 does not satisfy the requirements of A1 / A2≧36%, W / DE≧5, and DE≦6mm, and the manifold 322 does not belong to a high shear rate flow path. Experiments have confirmed that even if the process conditions of Comparative Example 2 (slurry coating speed, wet film thickness, particle size, particle density, viscosity, etc.) are the same as the process conditions of Embodiment 2, the problem of particle precipitation in the slurry is likely to occur because the manifold 322 does not belong to a high shear rate flow path. In addition, it is necessary to stop the equipment after 1 hour of use and then proceed with production.

[0041] Furthermore, from the simulation diagram of the shear rate of the manifold 322 in Figure 5B, it is known that the shear rate at the bottom of the manifold 322 is low (for example, 0.72 to 0.89), and slurry particles tend to accumulate at the bottom of the manifold 322.

[0042] Figure 6 shows a cross-sectional view of the coating die head 40 according to another comparative example of the present disclosure (for example, a view corresponding to the geometric center of the coating die head 30), with the shim 130 omitted.

[0043] The difference between the coating die head 40 and the coating die head 10 is that the shape of the manifold 422, formed by the slot gap between the upper die block 110, the lower die block 450, and the shim 130, differs from the shape of the manifold 122. Detailed explanations of other identical or similar parts are omitted.

[0044] In this comparative example, the manifold 422 has a nearly semicircular shape in cross-sectional view (Figure 6). In cross-sectional view, the width W of the manifold 422 is equal to W4, and the depth DE is equal to DE4.

[0045] According to comparative examples (such as Comparative Example 5 in Table 1 below), the width W (i.e., W4) of the manifold 322 in cross-sectional view (Figure 6) is 40 mm, and the depth DE (i.e., DE4) is 20 mm. The depth DE may correspond to the radius of the semicircle. The slurry coating speed is 9 m / min, the wet film thickness (i.e., substrate coating thickness) is 40 μm, the particle size in the slurry is 1 μm, and the particle density in the slurry is 1.2 g / cm³. 3The viscosity of the slurry is 1,000 cps. It should be understood that this disclosure is not limited thereto. In Comparative Example 5, the width / 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, Comparative Example 5 does not satisfy the requirements of A1 / A2≧36%, W / DE≧5, and DE≦6mm, and the manifold 422 does not belong to a high shear rate flow path. Experiments have confirmed that, despite the process conditions of Comparative Example 5 (slurry coating speed, wet film thickness, particle size, particle density, viscosity, etc.) being the same as the process conditions of Embodiment 5, the manifold 422 does not belong to a high shear rate flow path, making it prone to particle precipitation in the slurry. After some use, it is necessary to stop the machine to solve the problem and then resume production.

[0046] Table 1 below shows the cross-sectional conditions (depth DE, width W, width / depth ratio W / DE, cross-sectional area ratio A1 / A2) of manifolds according to several comparative examples and embodiments of this disclosure, as well as experimental results on whether the manifolds are high shear rate flow paths. The differences between the comparative examples and embodiments lie in the shape and size of the manifolds; detailed descriptions of other identical or similar parts are omitted.

[0047] (Table 1)

[0048] [Table 1]

[0049] As shown in Table 1, the manifolds of Comparative Examples 1 and 2 both have a roughly teardrop shape in cross-sectional view, and have the same or similar appearance as, for example, the manifold 322 shown in Figure 5A.

[0050] The manifolds of Comparative Examples 3-4 all exhibit a nearly teardrop shape in cross-sectional view and have an appearance identical or similar to, for example, the manifold 522 shown in Figure 7. Referring to Figure 7, the coating die head 50 includes an upper die block 110, a lower die block 550, and a shim 130 (not shown), and the slot gap between the upper die block 110, the lower die block 550, and the shim 130 (not shown) forms the manifold 522. The inclusion angle β of the teardrop-shaped tip of the manifold 522 is approximately 45°.

[0051] The manifolds of Comparative Examples 5 and 6 all have a nearly semicircular cross-sectional shape, which is the same as or similar to the manifold 422 shown in Figure 6, for example.

[0052] The manifolds of Embodiments 1-4 and Comparative Examples 7-8 all have a substantially rectangular cross-sectional shape, and are identical or similar in shape to, for example, the manifold 122 shown in Figure 3A.

[0053] The manifolds of Embodiment 5 and Comparative Example 9 both have a substantially chordal shape in cross-sectional view and have the same or similar appearance as, for example, the manifold 122' shown in Figure 4A.

[0054] Furthermore, since Comparative Examples 1-9 do not satisfy the conditions of A1 / A2≧36%, W / DE≧5, and DE≦6mm, the manifold is not a high shear rate flow path, so particle accumulation is likely to occur at the bottom of the manifold. Therefore, Comparative Examples 1-9 do not contribute to the production of a uniform coating film compared to Embodiments 1-5.

[0055] Please refer to Embodiment 2 and Comparative Example 7. Both have the same width W (30 mm), and the difference in depth DE is only 1 mm. However, even though the cross-section of the manifold in Comparative Example 7 is nearly rectangular, it does not satisfy the conditions A1 / A2 ≥ 36%, W / DE ≥ 5, and DE ≤ 6 mm, and therefore does not belong to a high shear rate flow path.

[0056] Refer to Embodiment 4 and Comparative Example 8. The width W of both is the same (50 mm), and the difference in depth DE is only 1 mm. However, the cross-section of the manifold in Comparative Example 8 is almost rectangular, and even though it satisfies the condition W / DE≧5, it does not satisfy the conditions A1 / A2≧36% and DE≦6 mm, so it still does not belong to a high shear rate flow path. Therefore, the importance of the values ​​A1 / A2≧36% and DE≦6 mm plays a crucial role in the shear rate of the manifold.

[0057] However, experimental results show that comparative example 8 still exhibits less particle sedimentation than comparative example 7. It is clear that satisfying the condition W / DE ≥ 5 can indeed increase the shear rate at the bottom of the manifold. This helps improve particle sedimentation.

[0058] Refer to Embodiment 5 and Comparative Example 9. Both have the same width W (30 mm), and the difference in depth DE is only 1 mm. However, even though the cross-section of the manifold in Comparative Example 9 has a nearly chord-shaped appearance, and its width W is the same as that of Embodiment 5, and the condition A1 / A2 ≥ 36% is met, the conditions W / DE ≥ 5 and DE ≤ 6 mm are not met, so it does not belong to a high shear rate flow path. Therefore, the importance of the values ​​W / DE ≥ 5 and DE ≤ 6 mm plays a crucial role in the shear rate within the manifold.

[0059] In summary, this disclosure provides an improved coating die head. For example, the particle settling properties of the slurry can be improved by designing the cross-sectional shape (not limited to the above shape) of the manifold of the coating die head to satisfy at least W / DE≧5. Furthermore, by combining the conditions of A1 / A2≧36% and DE≦6mm with the condition W / DE≧5, the manifold of the coating die head can be made into a high shear velocity flow path. When the manifold becomes a high shear velocity flow path, the coating liquid (slurry) in which the particles are dispersed can be rapidly dispersed and homogenized, allowing it to flow stably from the coating die head and form a film, thereby shortening the residence time of the coating liquid (slurry). It is possible to prevent particles in the slurry from settling in the manifold due to gravity. Therefore, the coating die head of this disclosure can significantly improve the settling of slurry particles at the bottom of the manifold, allowing the coating die head to be used for continuous production without stopping, significantly improving work efficiency, and the resulting coating slurry can be very uniform, resulting in substrate coating of excellent quality.

[0060] It will be apparent to those skilled in the art that various modifications and variations are possible with respect to the disclosed embodiments. This specification and examples are intended to be considered illustrative only, and the true scope of this disclosure is indicated by the following claims and equivalents. [Brief explanation of the drawing]

[0061] [Figure 1] This is an exploded perspective view of a coating die head according to one embodiment of the present disclosure. [Figure 2A] This is a perspective view of a coating die head according to another embodiment of the present disclosure. [Figure 2B] Figure 2A is an exploded perspective view of the coating die head. [Figure 3A] Figure 1 is a cross-sectional view of the coating die head. [Figure 3B] Figure 1 is a cross-sectional view of the manifold of the coating die head. [Figure 3C]Figure 1 is a simulation diagram of the shear rate inside the manifold of the coating die head. [Figure 3D] This is a cross-sectional view of a manifold according to an comparative example of this disclosure. [Figure 4A] This is a cross-sectional view of a coating die head according to another embodiment of the present disclosure. [Figure 4B] Figure 4A is a cross-sectional view of the manifold of the coating die head. [Figure 5A] This is a cross-sectional view of a coating die head according to a comparative example of the present disclosure. [Figure 5B] Figure 5A is a simulation diagram of the shear rate inside the manifold of the coating die head. [Figure 6] This is a cross-sectional view of a coating die head according to another comparative example of the present disclosure. [Figure 7] This is a cross-sectional view of a coating die head according to further comparative examples of the present disclosure.

Claims

1. An upper die block extending along a first direction and a second direction, wherein the extension distance of the upper die block in the first direction is greater than the extension distance of the upper die block in the second direction, and the first direction is perpendicular to the second direction, A lower die block positioned below the upper die block, The system includes a shim positioned between the upper die block and the lower die block, The slot gap between the upper die block, the lower die block, and the shim forms a manifold, the manifold has depth in a third direction, and the third direction is perpendicular to the first and second directions. A coating die head in which the width of the manifold in the second direction is W and the depth of the manifold in the third direction is DE, such that W / DE ≥ 5.

2. The coating die head according to claim 1, wherein the depth of the manifold in the third direction is 6 mm or less.

3. The coating die head according to claim 1, wherein, in a cross-sectional view, A1 is the cross-sectional area between the pipe wall of the manifold and a position 1 mm away from the pipe wall, A2 is the cross-sectional area of ​​the pipe wall of the manifold, and A1 / A2 ≥ 36%.

4. The coating die head according to claim 1, wherein the groove of the lower die block corresponds to the manifold.

5. The coating die head according to claim 1, wherein the groove of the upper die block corresponds to the manifold.

6. The slot gap between the upper die block, the lower die block, and the shim further forms a slit, the manifold and the slit are in communication, and after slurry enters the manifold, the slurry is discharged through the slit, according to claim 1.

7. The coating die head according to claim 6, wherein the cross-sectional area of ​​the manifold is larger than the cross-sectional area of ​​the slit.

Images