A coating die and a coating apparatus

Abstract

The application is suitable for the field of coating technology, and provides a coating die and a coating device. The coating die comprises a die assembly, the die assembly has a containing cavity, the containing cavity has a first wall and a second wall, a liquid outlet communicating with the containing cavity is formed between the first wall and the second wall, and the distance between the first wall and the second wall decreases along the length direction of the liquid outlet in the height direction of the liquid outlet. The coating die provided by the application is characterized in that the first wall and the second wall are oppositely and obliquely arranged, so that the thickness of the coating flowing out of the liquid outlet gradually increases or decreases along the length direction of the containing cavity. After the coating flowing out of the liquid outlet is coated on the surface of the substrate, the surface of the substrate can present different colors, and the coating effect is better.

Description

Technical Field

[0001] This application relates to the field of coating technology, and more specifically, to a coating die and coating equipment. Background Technology

[0002] With the advancement of technology, the colors of products are becoming increasingly diverse, and the gradient effect, with its endless variations from dark to light, has attracted more and more attention. Currently, almost every industry has products featuring gradient colors, such as sunroofs, side windows, and windshields in the automotive industry.

[0003] Among current coating processes, slot coating is widely used for coating various products due to its advantages such as simple operation, low production cost, and ability to achieve large-area coating. However, slot coating can only produce coatings of uniform thickness, meaning the color is consistent and it cannot produce different colors in one application, resulting in poor coating quality. Summary of the Invention

[0004] The purpose of this application is to provide a coating die and coating equipment, which aims to solve the technical problem of poor coating effect in existing slot coating processes.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a coating die head, including a die head assembly, the die head assembly having a receiving cavity, the receiving cavity having a first wall and a second wall, a liquid outlet communicating with the receiving cavity being formed between the first wall and the second wall, and the distance between the first wall and the second wall decreasing along the length direction of the liquid outlet in the height direction of the liquid outlet.

[0006] In one possible design, the mold head assembly includes a first mold head and a second mold head, the first mold head and the second mold head being interlocked, and the receiving cavity being formed between the first mold head and the second mold head, wherein the first wall is a side wall of the first mold head facing the second mold head, and the second wall is a side wall of the second mold head facing the first mold head.

[0007] In one possible design, the side of the first die head facing the second die head has a groove, and the first wall is the wall surface of the groove facing the second die head; or...

[0008] The second mold head has a groove on the side facing the first mold head, and the second wall is the wall surface of the groove facing the first mold head.

[0009] In one possible design, the coating die further includes a support block located between the first die and the second die; the first die, the second die, and the support block together form the receiving cavity, and in the outflow direction of the liquid outlet, the support block and the liquid outlet are located on opposite sides of the receiving cavity.

[0010] In one possible design, the size of the support block decreases along the length of the outlet in the height direction, and the size change trend of the support block is the same as the distance change trend between the first wall and the second wall.

[0011] In one possible design, the support block is connected to one of the first wall and the second wall, and the other wall has a limiting groove, into which the support block is inserted.

[0012] In one possible design, the coating die includes a blocking block located at the liquid outlet, and the blocking block is spaced apart from at least one sidewall of the liquid outlet along its length.

[0013] In one possible design, the first mold head also has a third wall disposed away from the first wall, and the second mold head also has a fourth wall disposed away from the second wall, and the third wall is parallel to the fourth wall.

[0014] In one possible design, the first wall and the second wall are arranged at an angle, the angle between the first wall and the second wall being less than or equal to 30 degrees; and / or, in the height direction of the receiving cavity, the maximum size of the outlet is less than 5 cm.

[0015] This application also provides a coating apparatus, including a coating die as described in any of the above technical solutions.

[0016] The beneficial effects of the coating die provided in this application are as follows: Compared with the prior art, the coating die provided in this application has a receiving cavity for containing coating material, which flows out from the receiving cavity through the outlet to coat the substrate surface. Since the distance between the first wall and the second wall decreases along the length of the outlet in the height direction, the thickness of the coating material flowing out of the outlet also decreases along the length of the outlet. Therefore, after the coating material flowing out of the outlet is applied to the substrate surface, the substrate surface can exhibit different colors in a single application, meaning that coatings of different thicknesses can be formed on the substrate surface in one application, resulting in a better coating effect.

[0017] The beneficial effects of the coating equipment provided in this application are as follows: Since the coating equipment provided in this application includes the above-mentioned coating die head, it has at least the beneficial effects achieved by the above-mentioned coating die head, which will not be repeated here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the coating apparatus provided in some embodiments of this application from one perspective;

[0020] Figure 2 This is a partial structural schematic diagram of a coating apparatus provided in some embodiments of this application from another perspective;

[0021] Figure 3 This is a cross-sectional structural schematic diagram of a coating die provided in some embodiments of this application;

[0022] Figure 4 This is a schematic diagram of the coating die head provided in some embodiments of this application from one perspective;

[0023] Figure 5 This is a cross-sectional structural schematic diagram of a coating die provided in some other embodiments of this application;

[0024] Figure 6 This is a cross-sectional structural schematic diagram of a coating die provided in some further embodiments of this application;

[0025] Figure 7 This is a schematic diagram of the coating die head provided in some other embodiments of this application from one perspective;

[0026] Figure 8 This is a cross-sectional structural schematic diagram of a coating die provided in some other embodiments of this application;

[0027] Figure 9 This is a schematic diagram of the coating die head provided in some other embodiments of this application from one perspective;

[0028] Figure 10 This is a cross-sectional structural schematic diagram of the coating die provided in some other embodiments of this application;

[0029] Figure 11 This is a cross-sectional structural schematic diagram of a coating die provided in some other embodiments of this application;

[0030] Figure 12 This is a cross-sectional structural schematic diagram of a coating die provided in some other embodiments of this application;

[0031] Figure 13 This is a cross-sectional structural diagram of the coating die provided in some other embodiments of this application.

[0032] The details of the reference numerals used in the above figures are as follows:

[0033] 1. Coating equipment; 10. Coating die; 20. Backing roller; 30. Substrate;

[0034] 101. Groove; 104. First wall; 105. Second wall;

[0035] 110. First mold head; 111. Third wall; 120. Second mold head; 121. Fourth wall; 122. Paint buffer tank; 130. Conveyor pipe; 140. Receiving cavity; 150. Liquid outlet; 160. Support block; 162. First limiting block; 163. Second limiting block; 164. Blocking block; 170. Limiting groove; 171. First tank; 172. Second tank; 173. Third tank. Detailed Implementation

[0036] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0037] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure 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 application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] Finally, it should be noted that in the accompanying drawings of the embodiments of this application, the arrowed leads point to the structure itself, and the dotted leads point to a region.

[0041] With the advancement of technology, the colors of products are becoming increasingly diverse, and the gradient effect, with its endless variations from dark to light, has attracted more and more attention. Currently, almost every industry has products featuring gradient colors, such as sunroofs, side windows, and windshields in the automotive industry.

[0042] Among current coating processes, slot coating is widely used for coating various products due to its advantages such as simple operation, low production cost, and ability to achieve large-area coating. Slot coating mainly uses a die with a narrow slit for coating. During the coating process, the paint flows out from the slit on the die and is applied to the substrate surface. However, since the slits on current dies are usually rectangular, the thickness of the paint applied to the substrate surface by this type of die is uniform, resulting in a uniform color on the substrate surface, making it impossible to coat different colors in one go. Therefore, current slot coating processes may require multiple coating operations when different colors need to be applied, and each coating operation requires changing the die with a different slit thickness or remixing the paint, making the operation cumbersome and the coating effect poor.

[0043] To address the aforementioned problems, this application provides a coating die and a coating device. To illustrate the technical solution described in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0044] like Figure 1 and Figure 2 As shown, some embodiments of this application provide a coating apparatus 1, on which a substrate 30 is mounted. The coating apparatus 1 includes a coating die 10, through which coating material is applied to the surface of the substrate. Specifically, the coating die 10 may be a slot coating die 10. Figures 3 to 11As shown, other embodiments of this application provide a coating die 10, including a die assembly having a receiving cavity 140. The receiving cavity 140 has a first wall 104 and a second wall 105, and a liquid outlet 150 communicating with the receiving cavity 140 is formed between the first wall 104 and the second wall 105. In the height direction of the liquid outlet 150, the distance between the first wall 104 and the second wall 105 decreases along the length direction of the liquid outlet 150.

[0045] The receiving cavity 140 is used to receive the coating material. The coating material in the receiving cavity 140 flows out through the outlet 150 to coat the surface of the substrate. The thicker the coating material, the darker the color, and vice versa. Optionally, the coating die 10 provided in this embodiment can be used to coat the substrate 30 of the light-modulating material, such as electrochromic organic materials, thermochromic materials, photochromic materials, polymer-dispersed liquid crystals, or dye liquid crystals; it can also be used to coat the substrate 30 of the non-light-modulating material, such as lithium batteries, perovskites, or nano-silver. Optionally, the coating equipment 1 provided in this embodiment can be used for flexible substrates (such as PET (Polyethylene terephthalate), PI (Polyimide), PEN (Polyethylene Naphthalate), paper, textile materials, etc.), and can also be used for rigid substrates (such as glass).

[0046] The outlet 150 has a height direction, a length direction, and a flow direction. Specifically, the flow direction of the outlet 150 refers to the direction of movement of the coating material within the receiving cavity 140 as it flows out through the outlet 150. The height direction, length direction, and flow direction of the outlet 150 are perpendicular to each other. For example... Figures 1 to 11 As shown in any of the attached figures, the Z direction represents the height direction of the outlet 150, the Y direction represents the length direction of the outlet 150, and the X direction represents the outflow direction of the outlet 150.

[0047] Compared with the prior art, the coating die 10 provided in this application embodiment has a reduced distance between the first wall 104 and the second wall 105 along the length of the outlet 150 in the height direction. This results in a reduction in the thickness of the coating flowing out of the outlet 150 along its length. When the coating from the outlet 150 is applied to the substrate surface, it can create different colors or even gradient effects on the substrate surface. Figure 2 As shown, the coating effect is better.

[0048] In some optional embodiments, the distance between the first wall 104 and the second wall 105 in the height direction of the outlet 150 can gradually decrease or gradually decrease along the length direction of the outlet 150. When the distance between the first wall 104 and the second wall 105 gradually decreases along the length direction of the outlet 150, at least one of the first wall 104 and the second wall 105 can be a stepped surface, such as... Figure 3 As shown, the first wall 104 is a stepped surface, and the second wall 105 is a flat surface. Along the height of the outlet 150, the distance between the first wall 104 and the second wall 105 gradually decreases along the length of the outlet 150. This arrangement allows the thickness of the paint flowing out of the outlet 150 to gradually decrease along the length of the outlet 150, resulting in a gradient color effect on the substrate surface after the paint is applied. When the distance between the first wall 104 and the second wall 105 gradually decreases along the length of the outlet 150, both the first wall 104 and the second wall 105 are flat surfaces, and they are set at an angle, so that the distance between the first wall 104 and the second wall 105 gradually decreases along the length of the outlet 150. This arrangement allows the thickness of the paint flowing out of the outlet 150 to decrease uniformly along the length of the outlet 150, resulting in a smoother color change on the substrate surface and a better coating effect.

[0049] In one possible design, such as Figure 4 As shown, the mold head assembly includes a first mold head 110 and a second mold head 120, which are interlocked, and a receiving cavity 140 is formed between the first mold head 110 and the second mold head 120. The first wall 104 is a side wall of the first mold head 110 facing the second mold head 120, and the second wall 105 is a side wall of the second mold head 120 facing the first mold head 110. In this configuration, the first mold head 110 and the second mold head 120 are two independent structures. During production, the first mold head 110 and the second mold head 120 can be processed separately to give the first mold head 110 a first wall 104 and the second mold head 120 a second wall 105. When the first mold head 110 and the second mold head 120 are engaged, the aforementioned receiving cavity 140 is formed between them, and a liquid outlet 150 communicating with the receiving cavity 140 is formed between the first mold head 110 and the second mold head 120. Therefore, by configuring the first mold head 110 and the second mold head 120, manufacturing can be facilitated to form the aforementioned receiving cavity 140.

[0050] In some alternative embodiments, such as Figure 5As shown, a groove 101 is provided on the side of the first mold head 110 facing the second mold head 120, and the first wall 104 is specifically the wall surface of the groove 101 facing the second mold head 120. In this arrangement, the groove 101 can be first opened on the surface of the first mold head 110, and the distance between the bottom wall of the groove 101 and the surface of the first mold head 110 can be reduced from one end to the other end, so that when the first mold head 110 and the second mold head 120 are engaged, the distance between the bottom wall of the groove 101 and the side wall of the second mold head 120 facing the first mold head 110 can be reduced from one end to the other end. The groove 101 is the receiving cavity 140, the bottom wall of the groove 101 is the first wall 104, and the side wall of the second mold head 120 facing the first mold head 110 is the second wall 105. As can be seen from the above, in this embodiment, the groove 101 can be first formed on the surface of the first mold head 110, and then the first mold head 110 and the second mold head 120 can be interlocked to form the receiving cavity 140. This arrangement facilitates manufacturing. Specifically, as shown... Figure 5 As shown, the first mold head 110 is provided with a groove 101, which has a bottom wall and a side wall surrounding the outer periphery of the bottom wall. The first mold head 110 is also provided with a first opening and a second opening communicating with the groove 101. The opening direction of the first opening is the same as the normal direction of the bottom wall of the groove 101, and the opening direction of the second opening is parallel to the bottom wall of the groove 101. When the first mold head 110 and the second mold head 120 are engaged, the side wall of the second mold head 120 facing the first mold head 110 covers the first opening, that is, the second wall 105 covers the first opening. The first wall 104, the second wall 105 and the side wall of the groove 101 together form a receiving cavity 140, and a liquid outlet 150 is formed at the second opening. The second opening is the liquid outlet 150.

[0051] In some alternative embodiments, a groove 101 may be provided on the side of the second mold head 120 facing the first mold head 110, and the second wall 105 is specifically the wall surface of the groove 101 facing the first mold head 110. In this arrangement, the groove 101 can be first formed on the surface of the second mold head 120, and the distance between the bottom wall of the groove 101 and the surface of the second mold head 120 can be reduced from one end to the other. Then, the first mold head 110 and the second mold head 120 are fastened together to form a receiving cavity 140, and the bottom wall of the groove 101 is the second wall 105. This arrangement also facilitates manufacturing. Specifically, as shown... Figure 6As shown, the second mold head 120 is provided with a groove 101, and the second mold head 120 is provided with a third opening and a fourth opening communicating with the groove 101. The third opening is set in the same way as the first opening, and the fourth opening is set in the same way as the second opening, which will not be described again here. When the first mold head 110 and the second mold head 120 are engaged, the side wall of the first mold head 110 facing the second mold head 120 covers the third opening, that is, the first wall 104 covers the third opening. The first wall 104, the second wall 105 and the side wall of the groove 101 together form a receiving cavity 140, and form a liquid outlet 150 at the fourth opening. The fourth opening is the liquid outlet 150.

[0052] In one possible design, such as Figure 7 As shown, the coating die 10 also includes a support block 160, which is located between the first die 110 and the second die 120. The first die 110, the second die 120, and the support block 160 together form a receiving cavity 140. In the outflow direction of the liquid outlet 150, the support block 160 and the liquid outlet 150 are located on opposite sides of the receiving cavity 140. Through the supporting action of the support block 160, the receiving cavity 140 is formed between the first die 110 and the second die 120, and the side of the receiving cavity 140 opposite to the liquid outlet 150 can be blocked by the support block 160. In this arrangement, the opposite sides of the first die 110 and the second die 120 can be flat, which reduces the surface complexity of the first die 110 and the second die 120, thereby reducing the processing difficulty of the first die 110 and the second die 120 and facilitating manufacturing. When the first mold head 110 or the second mold head 120 is provided with a groove 101, the groove 101 can be a channel that penetrates the first mold head 110 or the second mold head 120 along the outflow direction of the liquid outlet 150. The processing of such a channel is relatively simple, which can reduce the processing difficulty of the first mold head 110 and the second mold head 120 to a certain extent.

[0053] In some optional embodiments, in the height direction of the outlet 150, the size of the support block 160 decreases along the length direction of the outlet 150, and the trend of the size change of the support block 160 is the same as the trend of the distance change between the first wall 104 and the second wall 105. It should be noted that the trend of the size change of the support block 160 being the same as the trend of the distance change between the first wall 104 and the second wall 105 specifically means that in the height direction of the outlet 150, the direction in which the distance between the first wall 104 and the second wall 105 decreases is consistent with the direction in which the size of the support block 160 decreases, and the value of the distance change between the first wall 104 and the second wall 105 is the same as the value of the size change of the support block 160. That is, the size of the support block 160 decreases as the distance between the first wall 104 and the second wall 105 decreases, and in the length direction of the outlet 150, the distance between any region between the first wall 104 and the second wall 105 is equal to the size of the support block 160 located in that region. For example, if the distance between a certain region between the first wall 104 and the second wall 105 in the length direction of the outlet 150 is 3 cm, then the size of the support block 160 located in that region is also 3 cm. Since the distance between the first wall 104 and the second wall 105 decreases along the length direction of the outlet 150 in the height direction, by setting the support block 160, the support block 160 can fit well with the first wall 104 and the second wall 105 respectively, thereby making the sealing of the side of the receiving cavity 140 opposite to the outlet 150 stronger, and to a certain extent preventing the paint in the receiving cavity 140 from flowing out from places other than the outlet 150. Optionally, the support block 160 can be connected to one of the first mold head 110 and the second mold head 120. The support block 160 can be fixedly connected to the first mold head 110 or the second mold head 120 by means of adhesive bonding or welding, or it can be detachably connected by means of means of snap-fit ​​or screw connection. Alternatively, the support block 160 can be an integral structure with the first mold head 110 or the second mold head 120. For example, the support block 160 can be connected to the first mold head 110 or the second mold head 120 by means of integral injection molding or integral casting. There is no limitation here.

[0054] In some optional embodiments, the support block 160 has at least two opposing sides, one side of which matches the shape of the first wall 104 and the other side of which matches the shape of the second wall 105. This arrangement helps to improve the fit between the support block 160 and the first wall 104 and the second wall 105, thereby effectively preventing the paint in the receiving cavity 140 from flowing out except through the outlet 150. Optionally, when one of the first wall 104 and the second wall 105 is a stepped surface and the other is a flat surface, one side of the support block 160 is also a stepped surface, and the other side of the support block 160 opposite to the stepped surface is a flat surface. The stepped surface on the support block 160 contacts the stepped first wall 104 or the second wall 105, and the other side of the support block 160 opposite to the stepped surface contacts the flat first wall 104 or the second wall 105. In this configuration, the support block 160 can be composed of multiple stepped blocks of different thicknesses. These stepped blocks can be connected by welding, gluing, or other methods, or they can be connected by integral injection molding or integral casting. When both the first wall 104 and the second wall 105 are planar, the two opposite sides of the support block 160 are also planar, and the two opposite sides of the support block 160 are set at an included angle. The following description will use the example of both the first wall 104 and the second wall 105 being planar.

[0055] In one possible design, such as Figure 7 and Figure 8As shown, along the length of the outlet 150, one side of the first wall 104 contacts one side of the second wall 105. The support block is an inclined block, and the coating die also includes a first limiting block 162. Both the inclined block and the first limiting block 162 are located between the first die head 110 and the second die head 120. In the outflow direction of the outlet 150, the inclined block and the outlet 150 are located on opposite sides of the receiving cavity 140. In the height direction of the outlet 150, the two opposite sides of the inclined block are arranged at an angle, with one side contacting the first wall 104 and the other side contacting the second wall 105. In the height direction of the outlet 150, the size of the inclined block gradually decreases along the length direction of the receiving cavity 140. The size of the first limiting block 162 is equal to the maximum size of the inclined block. The first limiting block 162 is connected to the larger end of the inclined block and extends to the outlet 150 along the outflow direction. The first wall 104, the second wall 105, the inclined block, and the first limiting block 162 together form the receiving cavity 140. In this arrangement, in the length direction of the outlet 150, one side of the receiving cavity 140 is sealed by the contact between the first wall 104 and the second wall 105, and the other side of the receiving cavity 140 is sealed by the first limiting block 162. In the outflow direction of the outlet 150, the side of the receiving cavity 140 opposite to the outlet 150 is sealed by the inclined block. This effectively prevents the coating in the receiving cavity 140 from flowing out from places other than the outlet 150. Furthermore, in this configuration, the inclined block and the first limiting block 162, together with the first wall 104 and the second wall 105, can form a receiving cavity 140. This allows the side wall of the first mold head 110 facing the second mold head 120 to be a plane, and the side wall of the second mold head 120 facing the first mold head 110 to also be a plane, thereby reducing the processing difficulty of the first mold head 110 and the second mold head 120 and facilitating production and manufacturing.

[0056] In another possible design, such as Figure 9 and Figure 10As shown, the first wall 104 and the second wall 105 are spaced apart along the height direction of the outlet 150. The coating head also includes a second limiting block 163. In the height direction of the outlet 150, the size of the first limiting block 162 is equal to the maximum size of the inclined block, and the size of the second limiting block 163 is equal to the minimum size of the inclined block. The first limiting block 162 and the second limiting block 163 are spaced apart along the length direction of the outlet 150. The first limiting block 162 is connected to the larger end of the inclined block, and the second limiting block 163 is connected to the smaller end of the inclined block. The first limiting block 162 and the second limiting block 163 extend to the outlet 150 along the outflow direction of the outlet 150. The first wall 104, the second wall 105, the inclined block, the first limiting block 162, and the second limiting block 163 together form a receiving cavity 140. In this configuration, the inclined block, the first limiting block 162 and the second limiting block 163, together with the first wall 104 and the second wall 105, form the receiving cavity 140. This allows the side wall of the first mold head 110 facing the second mold head 120 to be a plane, and the side wall of the second mold head 120 facing the first mold head 110 to also be a plane, which also reduces the processing difficulty of the first mold head 110 and the second mold head 120.

[0057] In one possible design, the support block 160 is connected to one of the first wall 104 and the second wall 105, while the other wall has a limiting groove 170, into which the support block 160 is inserted. In this configuration, on the one hand, the limiting groove 170 and the support block 160 allow for quick positioning of the first mold head 110 and the second mold head 120 during assembly; on the other hand, the sidewall of the limiting groove 170 provides a certain limiting effect on the support block 160, thereby mutually limiting the first mold head 110 and the second mold head 120 and improving the connection stability of the first mold head 110 and the second mold head 120. For ease of description, the following explanation will use the example of the support block 160 being connected to the first wall 104 and the second wall 105 having a limiting groove 170.

[0058] Optionally, the coating die 10 may also include a first limiting block 162, a portion of which is inserted into the limiting groove 170. For example, as... Figure 7 As shown, the limiting groove 170 includes a first groove 171 and a second groove 172. A portion of the support block 160 is located within the first groove 171, and a portion of the first limiting block 162 is located within the second groove 172. Alternatively, when the coating die 10 includes both the first limiting block 162 and the second limiting block 163, both the first limiting block 162 and the second limiting block 163 are inserted into the limiting groove 170. For example, as... Figure 9As shown, the limiting groove 170 includes a first groove 171, a second groove 172, and a third groove 173. A portion of the support block 160 is located within the first groove 171, a portion of the first limiting block 162 is located within the second groove 172, and a portion of the second limiting block 163 is located within the third groove 173. This arrangement further improves the connection stability between the first mold head 110 and the second mold head 120.

[0059] In some alternative embodiments, the dimension of the limiting groove 170 in the height direction of the outlet 150 is smaller than the maximum dimension of the support block 160, so that the support block 160 protrudes from the limiting groove 170, thereby forming a receiving cavity 140 between the first mold head 110 and the second mold head 120. The limiting groove 170 has an opening opposite to the support block 160, through which the support block 160 can extend into the limiting groove 170. The limiting groove 170 also has a first bottom wall opposite to the opening, and the support block 160 has a second bottom wall opposite to the first bottom wall.

[0060] In some alternative embodiments, the dimensions of the support block 160 are consistent along the length of the outlet 150 in the height direction. The first bottom wall and the second wall 105 are inclined relative to each other, the support block 160 is located in the limiting groove 170, and the first bottom wall and the second bottom wall are in contact, so that the first wall 104 and the second wall 105 are inclined relative to each other.

[0061] In some alternative embodiments, the size of the support block 160 decreases along the length of the outlet 150 in the height direction, that is, the support block 160 is an inclined block, and the second bottom wall is inclined relative to the first wall 104. The first bottom wall can be arranged parallel to the second wall 105, or it can be inclined relative to the second wall 105.

[0062] Optionally, the first bottom wall is arranged parallel to the second wall 105, that is, the dimensions of any area of ​​the limiting groove 170 are the same in the height direction of the outlet 150. In this arrangement, the second bottom wall and the first bottom wall can be arranged relatively parallel, so that while the first wall 104 and the second wall 105 are relatively inclined, the first bottom wall and the second bottom wall can fit together to increase the contact area between the inclined block and the second die head 120, thereby improving the connection stability of the first die head 110 and the second die head 120. For example, in the height direction of the outlet 150, the first wall 104 and the second wall 105 are spaced apart, and the coating die head 10 also includes a first limiting block 162 and a second limiting block 163, and the inclined block, the first limiting block 162 and the second limiting block 163 are all inserted into the limiting groove 170. Of course, the second bottom wall and the first bottom wall can also be arranged relatively inclined, which is not limited here.

[0063] Alternatively, the first bottom wall may be inclined relative to the second wall 105, and the size of the limiting groove 170 gradually decreases along the length of the outlet 150 in the height direction of the outlet 150. In this configuration, the maximum distance between the second bottom wall and the first wall 104 is greater than the maximum depth of the limiting groove 170. For example, in the length direction of the outlet 150, one side of the first wall 104 contacts one side of the second wall 105, and the coating die 10 includes a first limiting block 162, with both the inclined block and the first limiting block 162 inserted into the limiting groove 170. In the height direction of the outlet 150, the size of the first limiting block 162 is equal to the maximum size of the inclined block, and the maximum size of the limiting groove 170 is smaller than the maximum size of the inclined block. In this embodiment, the second bottom wall and the second wall 105 are inclined relative to each other, so that while the first wall 104 and the second wall 105 are inclined relative to each other, the first bottom wall and the second bottom wall can fit together, thereby increasing the contact area between the inclined block and the second mold head 120, and thus improving the connection stability of the first mold head 110 and the second mold head 120.

[0064] In one possible design, such as Figures 11 to 13 As shown in any of the accompanying drawings, the coating die 10 also includes a blocking block 164, which is located at the liquid outlet 150. Along the length of the liquid outlet 150, the blocking block 164 is spaced apart from at least one sidewall of the liquid outlet 150. By providing the blocking block 164, the coating flowing out of the liquid outlet 150 is thinner in the area where the blocking block 164 is located compared to the coating flowing out of other areas of the liquid outlet 150. This arrangement results in alternating thicknesses of coating on the substrate surface after the coating from the liquid outlet 150 is applied, allowing the substrate surface color to transition from dark to light and back to dark. This facilitates the application of different patterns or textures on the substrate 30, leading to a more diverse coating effect. Optionally, the number of blocking blocks 164 can be one or more. When there are multiple blocking blocks 164, the multiple blocking blocks 164 are spaced apart at the liquid outlet 150, and in the length direction of the liquid outlet 150, the multiple blocking blocks 164 are spaced apart from the two side walls of the liquid outlet 150. The following description uses one blocking block 164 as an example. In some optional embodiments, such as... Figure 11 or Figure 12 As shown, one end of the blocking block 164 is connected to the first wall 104, and a mounting groove is provided on the second wall 105. The other end of the blocking block 164 is inserted into the mounting groove. The blocking block 164 divides the liquid outlet 150 into two parts. After the paint flowing out of the liquid outlet 150 is applied to the surface of the substrate, the paint on the substrate surface is spaced apart, thus forming a texture on the substrate surface to improve the coating effect. In some other optional embodiments, such as Figure 13As shown, the blocking block 164 is connected to the first wall 104, and the blocking block 164 is spaced apart from the second wall 105. In this way, the coating thickness on the substrate surface is set alternately, so that the color of the substrate surface can be from dark to light and then back to dark, which can also improve the coating effect.

[0065] In one possible design, the first mold head 110 further has a third wall 111, which is disposed opposite to the first wall 104, and the second mold head 120 further has a fourth wall 121, which is disposed opposite to the second wall 105, with the third wall 111 and the fourth wall 121 parallel. In this arrangement, the third wall 111 and the fourth wall 121 are arranged parallel to each other to facilitate the connection between the first mold head 110 and the second mold head 120. For example, the coating die 10 also includes bolts and nuts. The first die 110 and the second die 120 are provided with through holes along the height direction of the liquid outlet 150. The bolt passes through the through holes of the first die 110 and the second die 120 in sequence and is connected to the nut, thereby connecting the first die 110 and the second die 120. Since the third wall 111 and the fourth wall 121 are parallel, the heads of the nut and the bolt can be made to fit against the third wall 111 and the fourth wall 121 respectively, so as to increase the contact area between the nut and the bolt and the third wall 111 and the fourth wall 121, thereby improving the connection stability of the first die 110 and the second die 120.

[0066] In some alternative embodiments, the first wall 104 and the second wall 105 are arranged at an angle, with the angle between the first wall 104 and the second wall 105 being less than or equal to 30 degrees. In still other alternative embodiments, the maximum size of the outlet 150 in the height direction of the receiving cavity 140 is less than 5 cm, thereby avoiding, to some extent, excessive thickness of the coating flowing out of the outlet 150.

[0067] In some optional embodiments, the coating die 10 further includes a feed pipe 130 for conveying coating material. The feed pipe 130 communicates with the receiving cavity 140 to convey coating material into the receiving cavity 140. Optionally, the second die 120 has a coating buffer chamber 122 on the side facing the first die 110. The feed pipe 130 communicates with the coating buffer chamber 122, which in turn communicates with the receiving cavity 140. The coating buffer chamber 122 is designed to slow down the flow rate of coating material entering the receiving cavity 140, thereby reducing the flow rate of coating material exiting the outlet 150 and preventing coating material from being sprayed out of the outlet 150 to a certain extent.

[0068] Some embodiments of this application provide a coating apparatus 1, including a coating die 10 as described in any of the above technical solutions. Since the coating die 10 provided in the embodiments of this application can coat a coating with varying thickness on the substrate surface, giving the substrate surface a gradient color effect and resulting in a better coating effect, the coating apparatus 1 provided in the embodiments of this application has a better coating effect.

[0069] In some alternative embodiments, such as Figure 1 and Figure 2 As shown, the coating apparatus 1 also includes a back roller 20, a coating die 10 and the back roller 20 are spaced apart, a substrate 30 is located between the back roller 20 and the coating die 10, and the liquid outlet 150 of the coating die 10 faces the substrate 30 to facilitate coating the coating onto the surface of the substrate 30. The distance between the substrate 30 and the coating die 10 can be adjusted by adjusting the distance between the back roller 20 and the coating die 10.

[0070] Optionally, the coating equipment 1 further includes a take-up roll and a release roll. The two ends of the substrate 30 are connected to the take-up roll and the release roll, respectively. The substrate 30 is moved by rotating the take-up roll and the release roll. The moving speed of the substrate 30 is controlled by adjusting the rotation speed of the take-up roll and the release roll. Optionally, the moving speed of the substrate 30 is 1.2 m / min.

[0071] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A coating die head, characterized in that, The device includes a mold head assembly, the mold head assembly having a receiving cavity, the receiving cavity having a first wall and a second wall, a liquid outlet communicating with the receiving cavity being formed between the first wall and the second wall, and the distance between the first wall and the second wall decreasing along the length direction of the liquid outlet in the height direction of the liquid outlet; The mold head assembly includes a first mold head and a second mold head, which are fastened together. A receiving cavity is formed between the first mold head and the second mold head. The first wall is the side wall of the first mold head facing the second mold head, and the second wall is the side wall of the second mold head facing the first mold head. The first die head has a groove on the side facing the second die head, and the distance between the bottom wall of the groove and the surface of the first die head decreases from one end to the other. The first wall is the wall surface of the groove facing the second die head; or, The second mold head has a groove on the side facing the first mold head, and the distance between the bottom wall of the groove and the surface of the second mold head decreases from one end to the other. The second wall is the wall surface of the groove facing the first mold head. The coating die head includes a blocking block located at the liquid outlet. Along the length of the liquid outlet, the blocking block is spaced apart from at least one side wall of the liquid outlet. One end of the blocking block is connected to the first wall, and a mounting groove is provided on the second wall. The other end of the blocking block is inserted into the mounting groove. Alternatively, the blocking block is connected to the first wall and spaced apart from the second wall. The coating die head also includes a material conveying pipe for conveying coating material; the second die head has a coating material buffer chamber on the side facing the first die head, the material conveying pipe is connected to the coating material buffer chamber, and the coating material buffer chamber is connected to the receiving cavity.

2. The coating die head as described in claim 1, characterized in that, The first mold head also has a third wall, which is disposed away from the first wall. The second mold head also has a fourth wall, which is disposed away from the second wall. The third wall is parallel to the fourth wall.

3. The coating die head as described in claim 1 or 2, characterized in that, The first wall and the second wall are arranged at an angle, and the angle between the first wall and the second wall is less than or equal to 30 degrees; and / or, in the height direction of the receiving cavity, the maximum size of the liquid outlet is less than 5 cm.

4. A coating device, characterized in that, Includes the coating die head as described in any one of claims 1-3.

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