Coating die and coater

Abstract

This utility model discloses a coating die head and a coating machine having the coating die head. The coating die head includes an upper die head, a lower die head, and a gasket. The lower die head has a main cavity and a secondary cavity connected to the main cavity. A feed inlet is located in the middle of the main cavity. The gasket connects the upper die head and the lower die head. The upper die head, the lower die head, and the gasket form a coating slit. The coating slit connects to the secondary cavity, which is located between the coating slit and the main cavity. In the length direction of the lower die head, the cross-sectional area of ​​the secondary cavity gradually decreases from the middle to both ends, making the flow resistance in the middle of the secondary cavity greater than that in both ends. This reduces the flow rate in the middle of the secondary cavity, making the flow rate in the middle of the secondary cavity similar to that in both ends, ensuring uniform coating thickness of the slurry and improving coating quality.

Description

Technical Field

[0001] This utility model relates to the field of coating die head technology, and in particular to a coating die head and a coating machine. Background Technology

[0002] A coating die typically consists of an upper die, a lower die, and a spacer sandwiched between them. The lower die has a main cavity and a secondary cavity. A coating slit is formed between the upper die, lower die, and spacer. The secondary cavity is located between the main cavity and the coating slit. The slurry flows into the main cavity from the inlet, and the slurry in the main cavity is extruded through the secondary cavity and then coated onto the substrate via the coating slit. The main cavity and secondary cavity are generally elongated, with the inlet located in the middle of the main cavity. When the slurry flows into the main cavity from the inlet, the pressure in the main cavity gradually decreases from the middle to both ends. The flow velocity of the slurry in the middle of the secondary cavity is greater than that at both ends, resulting in uneven coating thickness—thicker in the middle and thinner at the sides—affecting the coating quality. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a coating die head that can improve coating quality.

[0004] This utility model also proposes a coating machine having the above-mentioned coating die head.

[0005] According to a first aspect embodiment of the present invention, a coating die head includes:

[0006] Upper mold head;

[0007] The lower die head has a main cavity and a secondary cavity connected to the main cavity, and a feed port is provided in the middle of the main cavity;

[0008] A gasket is connected between the upper die head and the lower die head. The upper die head, the lower die head, and the gasket together form a coating slit. The coating slit communicates with the secondary cavity, and the secondary cavity is located between the coating slit and the main cavity.

[0009] In the length direction of the lower die head, the cross-sectional area of ​​the secondary cavity gradually decreases from the middle to both ends.

[0010] The coating die head according to the first aspect embodiment of the present invention has at least the following beneficial effects:

[0011] When the coating die is working, the slurry supply system delivers slurry to the main cavity through the inlet. The slurry flows from the middle of the main cavity to both ends, making the pressure in the middle of the main cavity greater than the pressure at both ends. After the slurry fills the main cavity, it flows from the main cavity to the secondary cavity. Since the cross-sectional area of ​​the secondary cavity gradually decreases from the middle to both ends, the flow resistance in the middle of the secondary cavity is greater than that at both ends. This reduces the flow rate in the middle of the secondary cavity, making the flow rate in the middle of the secondary cavity close to that at both ends, ensuring uniform coating thickness and improving coating quality.

[0012] According to some embodiments of the present invention, in the length direction of the lower die head, the depth of the secondary cavity gradually decreases from the middle to both ends.

[0013] According to some embodiments of the present invention, in the length direction of the lower die head, the width of the secondary cavity gradually decreases from the middle to both ends along the direction from the main cavity to the coating slit.

[0014] According to some embodiments of this utility model, the upper die head is provided with a feeding hole, which is connected to the secondary cavity.

[0015] According to some embodiments of the present invention, a plurality of feeding holes are configured, and the plurality of feeding holes are arranged side by side at intervals along the length of the lower die head.

[0016] According to some embodiments of the present invention, the coating die head further includes a feeding valve assembly disposed on the upper die head, the feeding valve assembly being used to control the opening and closing of the feeding hole.

[0017] According to some embodiments of the present invention, the coating die head further includes an adjusting member, which is movably disposed on the upper die head to enter or exit the coating slit.

[0018] According to some embodiments of the present invention, the adjusting member is provided with an external thread structure, and the upper die head is provided with an internal thread structure that matches the external thread structure, so that the adjusting member is threadedly connected to the upper die head.

[0019] According to some embodiments of the present invention, multiple adjusting members are configured, and the multiple adjusting members are arranged side by side at intervals along the length direction of the lower die head.

[0020] The coating machine according to a second aspect of the present invention includes the coating die head described in the above embodiments.

[0021] The coating machine according to the second aspect embodiment of the present invention has at least the following beneficial effects:

[0022] When the coating die is working, the slurry supply system delivers slurry to the main cavity through the inlet. The slurry flows from the middle of the main cavity to both ends, making the pressure in the middle of the main cavity greater than the pressure at both ends. After the slurry fills the main cavity, it flows from the main cavity to the secondary cavity. Since the cross-sectional area of ​​the secondary cavity gradually decreases from the middle to both ends, the flow resistance in the middle of the secondary cavity is greater than that at both ends. This reduces the flow rate in the middle of the secondary cavity, making the flow rate in the middle of the secondary cavity close to that at both ends, ensuring uniform coating thickness and improving coating quality.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a cross-sectional view of the coating die head according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0027] Figure 3 This is a schematic diagram of the lower die head according to an embodiment of the present invention;

[0028] Figure 4 This is a top view of the lower die head according to an embodiment of the present invention;

[0029] Figure 5 for Figure 4 A cross-sectional view along the BB line.

[0030] Figure label:

[0031] Coating slit 101, upper die head 100, feeding hole 110, lower die head 200, main cavity 210, feed port 211, secondary cavity 220, gasket 300, feeding valve assembly 400, adjusting component 500. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] In related technologies, a coating die head generally consists of an upper die head, a lower die head, and a spacer sandwiched between the upper and lower die heads. The lower die head has a main cavity and a secondary cavity. A coating slit is formed between the upper die head, the lower die head, and the spacer. The secondary cavity is located between the main cavity and the coating slit. The slurry flows into the main cavity from the inlet, and the slurry in the main cavity is extruded through the secondary cavity and then coated onto the substrate via the coating slit. The main cavity and the secondary cavity are generally elongated, with the inlet located in the middle of the main cavity. When the slurry flows into the main cavity from the inlet, the pressure in the main cavity gradually decreases from the middle to both ends. The flow velocity of the slurry in the middle of the secondary cavity is greater than that at both ends, resulting in uneven coating thickness, with a thicker coating in the middle and thinner coating at the sides, which affects the coating quality.

[0037] Reference Figures 1 to 3According to a first aspect embodiment of the present invention, a coating die head includes an upper die head 100, a lower die head 200, and a gasket 300. The lower die head 200 has a main cavity 210 and a secondary cavity 220 communicating with the main cavity 210. A feed inlet 211 is provided at the middle position of the main cavity 210. The gasket 300 connects the upper die head 100 and the lower die head 200. The upper die head 100, the lower die head 200, and the gasket 300 enclose a coating slit 101, which communicates with the secondary cavity 220. 0, and the secondary cavity 220 is located between the coating slit 101 and the main cavity 210. In the length direction of the lower die head 200, the cross-sectional area of ​​the secondary cavity 220 gradually decreases from the middle to both ends, so that the flow resistance at the middle position of the secondary cavity 220 is greater than the flow resistance at both ends of the secondary cavity 220. This can reduce the flow rate at the middle position of the secondary cavity 220, making the flow rate at the middle position of the secondary cavity 220 close to the flow rate at both ends of the secondary cavity 220, ensuring uniform coating thickness of the slurry and improving coating quality.

[0038] For example, when the coating die is working, the slurry supply system delivers slurry to the main cavity 210 through the inlet 211. The slurry flows from the middle of the main cavity 210 to both ends, making the pressure at the middle of the main cavity 210 greater than the pressure at both ends. After the slurry fills the main cavity 210, it flows from the main cavity 210 to the secondary cavity 220. Since the cross-sectional area of ​​the secondary cavity 220 gradually decreases from the middle to both ends, the flow resistance at the middle of the secondary cavity 220 is greater than the flow resistance at both ends, which reduces the flow rate at the middle of the secondary cavity 220. This makes the flow rate at the middle of the secondary cavity 220 similar to the flow rate at both ends, ensuring uniform coating thickness and improving coating quality.

[0039] It should be noted that, according to the narrow slit flow theory, the smaller the flow resistance in the narrow slit, the faster the fluid flows and the greater the flow rate. The longer the length of the narrow slit in the flow direction, the greater the flow resistance in the narrow slit, and the slower the fluid flows and the smaller the flow rate. This will not be discussed in detail here.

[0040] It should be noted that the cross-section of the secondary cavity 220 refers to the cross-section of the secondary cavity 220 perpendicular to the length direction of the lower die head 200, and the cross-sectional area of ​​the secondary cavity 220 refers to the product of the depth of the secondary cavity 220 and the width of the secondary cavity 220 along the direction from the main cavity 210 to the coating slit 101, which is not limited here.

[0041] Reference Figure 5In some embodiments of this utility model, in the length direction of the lower die head 200, the depth of the secondary cavity 220 gradually decreases from the middle to both ends, so that the flow resistance at the middle position of the secondary cavity 220 is greater than the flow resistance at both ends of the secondary cavity 220, which can reduce the flow rate at the middle position of the secondary cavity 220, so that the flow rate at the middle position of the secondary cavity 220 is close to the flow rate at both ends of the secondary cavity 220, ensuring uniform coating thickness of the slurry and improving coating quality.

[0042] For example, the bottom wall of the secondary cavity 220 has a conical structure, and the bottom wall of the secondary cavity 220 is recessed in the direction away from the upper die head 100. That is, the depth of the secondary cavity 220 gradually decreases from the middle to both ends, so that the flow resistance at the middle position of the secondary cavity 220 is greater than the flow resistance at both ends of the secondary cavity 220. This can reduce the flow rate at the middle position of the secondary cavity 220, so that the flow rate at the middle position of the secondary cavity 220 is close to the flow rate at both ends of the secondary cavity 220, ensuring uniform coating thickness of the slurry and improving coating quality.

[0043] Reference Figure 4 In some embodiments of this utility model, in the length direction of the lower die head 200, the width of the secondary cavity 220 along the direction from the main cavity 210 to the coating slit 101 gradually decreases from the middle to both ends, so that the flow resistance at the middle position of the secondary cavity 220 is greater than the flow resistance at both ends of the secondary cavity 220, which can reduce the flow rate at the middle position of the secondary cavity 220, so that the flow rate at the middle position of the secondary cavity 220 is close to the flow rate at both ends of the secondary cavity 220, ensuring uniform coating thickness of the slurry and improving coating quality.

[0044] For example, the side wall of the secondary cavity 220 near the main cavity 210 is a conical structure. Along the direction from the coating slit 101 to the main cavity 210, the side wall of the secondary cavity 220 near the main cavity 210 is recessed, that is, the width of the secondary cavity 220 gradually decreases from the middle to both ends. This makes the flow resistance at the middle position of the secondary cavity 220 greater than the flow resistance at both ends of the secondary cavity 220, which can reduce the flow rate at the middle position of the secondary cavity 220 and make the flow rate at the middle position of the secondary cavity 220 close to the flow rate at both ends of the secondary cavity 220, ensuring uniform coating thickness of the slurry and improving coating quality.

[0045] As another implementation, the sidewall of the secondary cavity 220 away from the main cavity 210 can be a conical structure. Along the direction from the main cavity 210 to the coating slit 101, the sidewall of the secondary cavity 220 away from the main cavity 210 is recessed. This is not a limitation.

[0046] Reference Figure 1 In some embodiments of this utility model, the upper die head 100 is provided with a feeding hole 110, which is connected to the secondary cavity 220. It can replenish the secondary cavity 220 with slurry, realize the pressure uniformity in all parts of the secondary cavity 220, ensure the coating thickness of the slurry is uniform, and thus improve the coating quality.

[0047] For example, when the slurry in the secondary cavity 220 is insufficient, the slurry supply system can deliver slurry to the secondary cavity 220 through the replenishment hole 110 to make the pressure uniform throughout the secondary cavity 220, ensuring uniform coating thickness of the slurry, thereby improving the coating quality.

[0048] It should be noted that the feeding hole 110 can be circular or oblong, and there is no restriction on its shape.

[0049] In some embodiments of this utility model, multiple feeding holes 110 are provided, and the multiple feeding holes 110 are arranged side by side at intervals along the length of the lower die head 200, which can accurately replenish the slurry in the secondary cavity 220 where the slurry is insufficient, thereby improving the coating quality.

[0050] For example, by setting multiple feeding holes 110, when there is insufficient slurry at a certain position in the sub-cavity 220, the corresponding feeding hole 110 delivers slurry to that position, so that the pressure at all points in the sub-cavity 220 is uniform, ensuring that the coating thickness of the slurry is uniform, thereby improving the coating quality.

[0051] Reference Figure 1 In some embodiments of this utility model, the coating die head also includes a feeding valve assembly 400 disposed on the upper die head 100. The feeding valve assembly 400 is used to control the opening and closing of the feeding hole 110, which can improve the coating quality.

[0052] For example, when the slurry in the secondary cavity 220 is insufficient, the feed valve assembly 400 controls the feed hole 110 to open; when the slurry in the secondary cavity 220 is sufficient, the feed valve assembly 400 controls the feed hole 110 to close, which can improve the coating quality.

[0053] It should be noted that the feed valve assembly 400 is either a pneumatic valve or an electric valve, and no restriction is made here.

[0054] It is understood that a pressure sensor is installed in the secondary cavity 220 to detect the pressure within the secondary cavity 220. The pressure sensor is electrically connected to the feed valve assembly 400. When the slurry in the secondary cavity 220 is insufficient, the pressure sensor detects that the pressure in the secondary cavity 220 is too low and sends a first electrical signal to the feed valve assembly 400, causing the feed valve assembly 400 to control the feed orifice 110 to open. When the slurry in the secondary cavity 220 is sufficient, the pressure sensor detects that the pressure in the secondary cavity 220 is too high and sends a second electrical signal to the feed valve assembly 400, causing the feed valve assembly 400 to control the feed orifice 110 to close, thereby improving coating quality. One of the first and second electrical signals is a low-level signal, and the other is a high-level signal.

[0055] Reference Figure 1In some embodiments of this utility model, the coating die head also includes an adjusting member 500, which is movably disposed on the upper die head 100 to enter or exit the coating slit 101, thereby facilitating the adjustment of the coating thickness and improving the coating quality.

[0056] For example, when the adjusting member 500 enters the coating slit 101, the adjusting member 500 blocks the slurry from flowing out of the coating slit 101, thereby reducing the amount of slurry output from the coating die. When the adjusting member 500 exits the coating slit 101, the adjusting member 500 does not block the slurry, thereby increasing the amount of slurry output from the coating die. This makes it easier to adjust the coating thickness and thus improve the coating quality.

[0057] In some embodiments of this utility model, the adjusting member 500 is provided with an external thread structure, and the upper die head 100 is provided with an internal thread structure that matches the external thread structure, so that the adjusting member 500 is threadedly connected to the upper die head 100, which facilitates the movement of the adjusting member 500.

[0058] As another implementation, the adjusting member 500 may also be connected to a power component, the output end of which is connected to the adjusting member 500, so that the adjusting member 500 can enter or exit the coating slit 101, which can also improve the coating quality.

[0059] In some embodiments of this utility model, multiple adjusting members 500 are configured, and the multiple adjusting members 500 are arranged side by side at intervals along the length direction of the lower die head 200, which can facilitate precise control of the amount of slurry output at each point of the coating slit 101.

[0060] It should be noted that the adjusting component 500 and the feeding hole 110 are staggered along the length of the upper die head 100 to ensure uniform pressure in all parts of the secondary cavity 220, thereby ensuring uniform coating thickness of the slurry and improving coating quality.

[0061] Reference Figure 1 , Figure 2 According to the second aspect of the present invention, the coating machine includes the coating die head of the first aspect of the present invention. When the slurry feeding pressure is too high, the middle position of the secondary cavity 220 can still effectively buffer the pressure at the middle position of the main cavity 210, ensuring that the coating thickness of the slurry is uniform and improving the coating quality.

[0062] For example, when the coating die is working, the slurry supply system delivers slurry to the main cavity 210 through the inlet 211. The slurry flows from the middle of the main cavity 210 to both ends, making the pressure at the middle of the main cavity 210 greater than the pressure at both ends. After the slurry fills the main cavity 210, it flows from the main cavity 210 to the secondary cavity 220. Since the cross-sectional area of ​​the secondary cavity 220 gradually decreases from the middle to both ends, the flow resistance at the middle of the secondary cavity 220 is greater than the flow resistance at both ends, which reduces the flow rate at the middle of the secondary cavity 220. This makes the flow rate at the middle of the secondary cavity 220 similar to the flow rate at both ends, ensuring uniform coating thickness and improving coating quality.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A coating die head, characterized in that, include: Upper die head (100); The lower die head (200) is provided with a main cavity (210) and a secondary cavity (220) connected to the main cavity (210). The main cavity (210) is provided with a feed port (211) at the middle position. A gasket (300) is connected between the upper die head (100) and the lower die head (200). The upper die head (100), the lower die head (200) and the gasket (300) enclose a coating slit (101). The coating slit (101) communicates with the secondary cavity (220), and the secondary cavity (220) is located between the coating slit (101) and the main cavity (210). In the length direction of the lower die head (200), the cross-sectional area of ​​the secondary cavity (220) gradually decreases from the middle to both ends.

2. The coating die head according to claim 1, characterized in that, Along the length of the lower die head (200), the depth of the secondary cavity (220) gradually decreases from the middle to both ends.

3. The coating die head according to claim 1, characterized in that, Along the length of the lower die head (200), the width of the secondary cavity (220) gradually decreases from the middle to both ends along the direction from the main cavity (210) to the coating slit (101).

4. The coating die head according to claim 1, characterized in that, The upper die head (100) is provided with a feeding hole (110), which is connected to the secondary cavity (220).

5. The coating die head according to claim 4, characterized in that, The feeding holes (110) are configured in multiple ways, and the multiple feeding holes (110) are arranged side by side at intervals along the length of the lower die head (200).

6. The coating die head according to claim 4, characterized in that, The coating die head also includes a feeding valve assembly (400) disposed on the upper die head (100), the feeding valve assembly (400) being used to control the opening and closing of the feeding hole (110).

7. The coating die head according to claim 1, characterized in that, The coating die head also includes an adjusting member (500), which is movably disposed on the upper die head (100) to enter or exit the coating slit (101).

8. The coating die head according to claim 7, characterized in that, The adjusting member (500) is provided with an external thread structure, and the upper die head (100) is provided with an internal thread structure that matches the external thread structure, so that the adjusting member (500) and the upper die head (100) are threadedly connected.

9. The coating die head according to claim 7, characterized in that, Multiple adjustment members (500) are provided, and the multiple adjustment members (500) are arranged side by side at intervals along the length direction of the lower die head (200).

10. A coating machine, characterized in that, Includes the coating die head as described in any one of claims 1 to 9.

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