Anti-settling die head and coating machine
By setting up upper and lower cavities separated by partitions and a return pipe inside the coating machine die head, the flow and return of the coating solution are controlled, solving the problem of uneven pressure inside the die head cavity and achieving uniformity and stability of coating.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2026-03-20
AI Technical Summary
In existing slot coating technology, the solution pressure in the die cavity is inconsistent, which leads to poor lateral accuracy of the coated film and makes it difficult to achieve uniform coating.
Design an anti-settling die head, including an upper die head, a lower die head, a gasket, and a liquid inlet pipe. The inner cavity is divided into an upper and lower groove by a partition, which are connected by a manifold flow channel. It is equipped with a return pipe and an adjustment component to control the flow and return of the coating solution and ensure the pressure consistency inside the die head.
It effectively reduces the pressure drop of the coating solution in the die head, improves the consistency and uniformity of the coating film along the length of the die head, and ensures coating quality.
Smart Images
Figure CN224010264U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of coating machine, in particular to a kind of anti-settling die head and coating machine. BACKGROUND
[0002] Slit coating is a kind of uniform deposition film pre-measuring process method, widely used in new energy perovskite solar cell, lithium battery pole piece, photoresist, functional film and various fields, is one of the development directions of advanced processing mode.
[0003] Two die heads of slit coating usually leave liquid storage tank in the middle, and are spaced apart by gasket. In coating process, coating solution is delivered into liquid storage tank by external pump, and immediately fills the entire die cavity, then extruded to form coating solution column through liquid outlet slit and contact with substrate; again, coating film is formed on substrate by the relative movement between substrate and coating die, while external liquid supply is continued. However, with the increase of coating width, longer cavity is needed, and the consistency of solution transverse pressure in cavity will be worse, and pressure difference will cause solution to settle, resulting in poor transverse precision of coating film. Therefore, how to ensure the consistency and stability of solution pressure in die cavity to achieve uniform coating is crucial. SUMMARY
[0004] The utility model provides a kind of anti-settling die head and coating machine to ensure the consistency and stability of solution pressure in die cavity to achieve uniform coating.
[0005] The utility model is realized in this way, provide a kind of anti-settling die head, including the die body of being provided with liquid outlet slit, the die body includes: upper die, lower die and gasket, and one end is communicated with liquid supply barrel, the other end is communicated with the liquid inlet pipe of die body, the upper die and lower die are buckled connection, the gasket is installed between upper die and lower die, liquid outlet slit is set between upper die and lower die and located in the lower part of die body, the lower die is internally provided with inner cavity for coating solution to flow, upper groove cavity and lower groove cavity are set in the middle of the inner cavity by partition, and left and right ends are communicated by bifurcated pipe flow channel, the upper groove cavity is provided with the middle upper groove cavity for controlling coating solution from liquid inlet pipe to flow into upper groove cavity, then extruded to lower groove cavity through bifurcated pipe flow channel left and right ends of upper groove cavity, so that coating solution fills the middle liquid inlet of inner cavity, and liquid outlet slit is communicated with lower groove cavity.
[0006] Further, the upper tank cavity further comprises left and right liquid inlet ports arranged above respectively, the liquid inlet pipe is communicated with left and right return flow pipes respectively, the other end of the left return flow pipe is communicated with the left liquid inlet port, the other end of the right return flow pipe is communicated with the right liquid inlet port, and the left and right return flow pipes are respectively provided with stop valves and external interfaces; the external interfaces are installed with adjusting assemblies, the adjusting assemblies are used for controlling the excess coating solution in the inner cavity to return to the liquid supply barrel through the left and right return flow pipes, so that the liquid outlet slit of the die head uniformly discharges in the length direction.
[0007] Further, the adjusting assembly comprises a liquid return pipeline communicated with the external interface at one end and the liquid supply barrel at the other end, and a pressure gauge and a flow regulating valve are arranged on the liquid return pipeline.
[0008] Further, the position of the middle liquid inlet port is higher than the positions of the left and right liquid inlet ports, and the position of the left liquid inlet port is the same as the position of the right liquid inlet port.
[0009] Further, the upper tank cavity and the lower tank cavity are sprayed with protective layers.
[0010] Further, the material of the protective layer is Teflon.
[0011] Further, the thickness of the protective layer ranges from 0.04mm to 0.15mm.
[0012] The utility model discloses a kind of coating machines, including coating machine body and the coating machine body as described above is set on the anti-settling die head of the preceding.
[0013] Compared with prior art, the anti-settling die head and coating machine of the utility model, the anti-settling die head includes die head body, die head body includes upper die head and lower die head mutually buckled connection, inner cavity for coating solution to flow is arranged in lower die head, upper tank cavity and lower tank cavity are separated by partition and communicated by bifurcated pipe flow channel at left and right ends in inner cavity middle, coating solution enters die head and extrudes liquid from upper tank cavity both sides to lower tank cavity simultaneously, the return flow of coating solution on both sides of die head is controlled, coating solution pressure drop in die head tank cavity middle and both sides can be effectively reduced, so that coating solution is prevented from causing settlement due to uneven flow velocity caused by pressure drop, and the consistency of coating film in the length direction of die head is improved. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the structure perspective view of the anti-settling die head of the utility model;
[0015] Figure 2 It is Figure 1 Inner structure schematic view of lower die head.
[0016] The figure is marked as: 1, upper die head; 2, lower die head; 3, gasket; 4, liquid inlet pipe; 5, partition; 6, upper slot cavity; 7, lower slot cavity; 8, middle liquid inlet; 9, left return pipe; 10, right return pipe; 11, stop valve; 12, external interface; 13, left liquid inlet; 14, right liquid inlet. DETAILED DESCRIPTION
[0017] In order to make the technical problems, technical solutions and beneficial effects of the utility model to be solved more clear and obvious, the utility model is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.
[0018] Please refer to Figure 1 and Figure 2 at the same time, a preferred embodiment of the anti-settling die head is provided, which comprises a die head body provided with a liquid outlet slit, and the die head body comprises: an upper die head 1, a lower die head 2, a gasket 3, and a liquid inlet pipe 4 communicated with the liquid supply barrel at one end and communicated with the die head body at the other end. The upper die head 1 and the lower die head 2 are connected in a buckling manner. Specifically, the upper die head 1 and the lower die head 2 are fixedly connected by bolts.
[0019] The gasket 3 is installed between the upper die head 1 and the lower die head 2, and the liquid outlet slit is arranged between the upper die head 1 and the lower die head 2 and located at the lower part of the die head body. An inner cavity for the flow of coating solution is formed in the lower die head 2, and an upper slot cavity 6 and a lower slot cavity 7 are arranged in the inner cavity and separated by a partition 5 and communicated by bifurcated pipe flow channels at the left and right ends. An intermediate liquid inlet 8 for controlling the flow of coating solution from the liquid inlet pipe 4 into the upper slot cavity 6 and then extruded into the lower slot cavity 7 through the bifurcated pipe flow channels at the left and right ends of the upper slot 6 is arranged at the upper middle part of the upper slot cavity 6, and the liquid outlet slit is communicated with the lower slot cavity 7.
[0020] When the die head starts to work, the coating solution in the liquid supply barrel flows into the upper slot cavity 6 from the intermediate liquid inlet 8 along the liquid inlet pipe 4 under the action of the liquid supply pump, and flows into the lower slot cavity 7 from the left and right ends of the upper slot cavity 6 along the partition 5 and the bifurcated pipe flow channels, so that the die head is filled with coating solution. At the same time, the coating solution in the lower slot cavity 7 is extruded by the continuously flowing coating solution from both sides of the upper slot cavity 6, which can effectively reduce the pressure drop of the coating solution in the middle and both ends of the lower slot cavity 7, thereby preventing the coating solution from settling due to uneven flow rate caused by pressure drop, and improving the consistency of the coating film in the transverse direction of the die head.
[0021] In the embodiment of the present disclosure, in order to ensure that the pressure of the coating solution in the middle and both ends of the length direction of the lower groove cavity 7 is consistent, the upper groove cavity 6 further comprises a left liquid inlet 13 and a right liquid inlet 14 arranged above respectively, and the liquid inlet pipe 4 is communicated with a left backflow pipe 9 and a right backflow pipe 10 respectively, one end of the left backflow pipe 9 is communicated with the left liquid inlet 13, and one end of the right backflow pipe 10 is communicated with the right liquid inlet 14, and a stop valve 11 and an external interface 12 are arranged on the left backflow pipe 9 and the right backflow pipe 10 respectively.
[0022] The stop valve 11 is closed when the liquid outlet slit of the die sprays, so that the coating solution in the liquid inlet pipe 4 can only flow into the upper groove cavity 6 from the middle liquid inlet 8, and then flow into the lower groove cavity 7 from the left and right ends of the upper groove cavity 6 along the baffle 5 and the manifold flow channel, so that the die is filled with the coating solution.
[0023] The external interface 12 is provided with an adjusting assembly, which can control the excess coating solution in the inner cavity to flow back to the liquid supply barrel through the left backflow pipe 9 and the right backflow pipe 10, so that the liquid outlet slit of the die uniformly discharges in the length direction.
[0024] In the embodiment of the present disclosure, due to long-term use of the die, the coating solution is easy to deposit and adhere to the inner wall of the die, the liquid inlet pipe 4, the left backflow pipe 9 and the right backflow pipe 10. The adjusting assembly is also used to connect an external cleaning system to clean the left backflow pipe 9 and the right backflow pipe 10 when the stop valve 11 is closed, or to connect the external cleaning system to clean the inside of the die when the liquid outlet slit of the die stops spraying, the stop valve 11 is opened, and the external interface 12 is closed.
[0025] In the embodiment of the present disclosure, the adjusting assembly comprises a liquid return pipe connected with the external interface 12 at one end and connected with the liquid supply barrel at the other end, and a pressure gauge and a flow control valve are arranged on the liquid return pipe respectively. The pressure gauge is used to monitor the pressure of the coating solution flowing into the lower groove cavity 7, and the flow control valve is used to adjust the flow of the coating solution flowing back in the left backflow pipe 9 and the right backflow pipe 10 according to the value of the pressure gauge, so that a flow-controllable circulation system is formed between the left backflow pipe 9 and the liquid supply barrel and between the right backflow pipe 10 and the liquid supply barrel respectively, thereby ensuring that the liquid outlet slit of the die uniformly discharges in the length direction.
[0026] In the embodiment of the present disclosure, in order to ensure the consistency of the flow rate of the coating solution on both sides of the lower groove cavity 7 and reduce the pressure drop at both ends and the middle of the lower groove cavity 7, the position of the middle liquid inlet 8 is higher than the positions of the left liquid inlet 13 and the right liquid inlet 14, and the positions of the left liquid inlet 13 and the right liquid inlet 14 are at the same height.
[0027] Specifically, the top of the upper groove cavity 6 is a clothes hanger type.
[0028] In the embodiments of the present disclosure, in order to slow down the deposition of the coating solution on the inner surfaces of the upper tank cavity 6 and the lower tank cavity 7, a protective layer is sprayed on the inner surfaces of the upper tank cavity 6 and the lower tank cavity 7.
[0029] Specifically, the material of the protective layer is Teflon. Since Teflon has a very low friction coefficient, it can effectively slow down the deposition of the coating solution on the inner surfaces of the upper tank cavity 6 and the lower tank cavity 7.
[0030] More specifically, the thickness of the protective layer ranges from 0.04 mm to 0.15 mm.
[0031] Specifically, before the die head starts spraying, the shut-off valves 11 on both sides are closed. The coating solution in the liquid supply tank enters the upper tank cavity 6 through the liquid inlet pipe 4, and then flows into the lower tank cavity 7 from both ends of the upper tank cavity 6 along the partition plate 5 and the manifold flow channel. At the same time, the coating solution in the lower tank cavity 7 is extruded by the continuously flowing coating solution from both sides of the upper tank cavity 6, and fills the entire die head. The coating solution flows out of the die head outlet slit and forms a film on the coated sheet. Since the liquid inlet amount of the liquid inlet pipe 4 is greater than the liquid outlet amount of the outlet slit, the coating solution enters the die head through the intermediate pipeline, the inner cavity of the die head is filled, and the excess coating solution flows back to the liquid supply tank through the left return pipe 9 and the right return pipe 10, respectively. The return flow of the coating solution in the left return pipe 9 and the right return pipe 10 is controlled according to the cooperation of the pressure gauge and the flow control valve. The formation of the flow-controllable solution self-circulation system between the liquid supply tank and the die head makes the liquid outlet amount of the die head consistent in the length direction, and improves the uniformity and consistency of the coating.
[0032] Further, the cleaning mode can clean the inside of the die head or the left return pipe 9 and the right return pipe 10. The cleaning mode of the present application does not need to disassemble the die head, and is convenient to clean. Moreover, it will not cause equipment damage and precision loss due to disassembly and cleaning.
[0033] Specifically, the way to clean the inside of the die head is to open the shut-off valves 11 on both sides, connect the liquid outlet of the liquid supply pump with the liquid inlet pipe 4, add cleaning liquid in the liquid supply tank, and start the large-flow mode of the liquid supply pump. The cleaning liquid enters the inside of the die head from the intermediate liquid inlet 8, the left liquid inlet 13 and the right liquid inlet 14 at the same time, and cleans the inside of the die head.
[0034] The way to clean the left return pipe 9 and the right return pipe 10 is to close the shut-off valves 11 on both sides and open the flow control valves on both sides, connect the liquid supply pump with one of the external pipelines, connect the other external pipeline with the filter and put it into the liquid supply tank, and start the liquid supply pump. The cleaning liquid enters the inside of the die head from the left return pipe 9 (or the right return pipe 10) and then flows back to the liquid supply tank from the right return pipe 10 (or the left return pipe 9) through the filter, which can realize online circulation self-cleaning.
[0035] The utility model discloses still disclose a coating machine, including coating machine body and set up on the coating machine body like preceding described anti -settling die.
[0036] The above merely describes preferred embodiments of the utility model, and is not intended to limit the utility model, and any modification, equivalent replacement and improvement etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. An anti-settling mold head, comprising a mold head body having a liquid outlet slit, the mold head body comprising: The upper mold head (1), the lower mold head (2), and the gasket (3), as well as the inlet pipe (4) with one end connected to the liquid supply tank and the other end connected to the mold head body, wherein the upper mold head (1) and the lower mold head (2) are interlocked, the gasket (3) is installed between the upper mold head (1) and the lower mold head (2), and the liquid outlet slit is set between the upper mold head (1) and the lower mold head (2) and located at the lower part of the mold head body. The lower mold head (2) has an internal cavity for the flow of the coating solution. The inner cavity is provided with an upper cavity (6) and a lower cavity (7) separated by a partition (5) and connected at the left and right ends by manifold channels. The upper cavity (6) has a middle inlet (8) connected to the inlet pipe (4) for controlling the coating solution to flow from the inlet pipe (4) into the upper cavity (6) and then be squeezed into the lower cavity (7) through the manifold channels at the left and right ends of the upper cavity (6), so that the coating solution fills the middle inlet (8) of the inner cavity. The outlet slit is connected to the lower cavity (7).
2. The anti-settlement mold head as described in claim 1, characterized in that, The upper cavity (6) also includes a left liquid inlet (13) and a right liquid inlet (14) respectively located on the upper part. The liquid inlet pipe (4) is connected to a left return pipe (9) and a right return pipe (10) respectively. The other end of the left return pipe (9) is connected to the left liquid inlet (13), and the other end of the right return pipe (10) is connected to the right liquid inlet (14). The left return pipe (9) and the right return pipe (10) are respectively provided with a shut-off valve (11) and an external interface (12). An adjustment component is installed on the external interface (12). The adjustment component is used to control the excess coating solution in the inner cavity to flow back to the liquid supply tank through the left return pipe (9) and the right return pipe (10), so that the liquid outlet slit of the mold head can discharge liquid evenly in the length direction.
3. The anti-settlement mold head as described in claim 2, characterized in that, The regulating component includes a return pipe with one end connected to the external interface (12) and the other end connected to the liquid supply tank. A pressure gauge and a flow regulating valve are respectively installed on the return pipe.
4. The anti-settlement mold head as described in claim 2, characterized in that, in, The middle inlet (8) is located at a higher position than the left inlet (13) and the right inlet (14), and the left inlet (13) is located at the same height as the right inlet (14).
5. The anti-settlement mold head as described in any one of claims 1-4, characterized in that, The inner surfaces of the upper cavity (6) and the lower cavity (7) are coated with a protective layer.
6. The anti-settlement mold head as described in claim 5, characterized in that, The protective layer is made of Teflon.
7. The anti-settlement mold head as described in claim 6, characterized in that, The thickness of the protective layer ranges from 0.04 mm to 0.15 mm.
8. A coating machine, characterized in that, It includes a coating machine body and an anti-settling die head as described in any one of claims 1-7, which is disposed on the coating machine body.