Air floating type die head

Abstract

The utility model discloses an air floating type die head, which is characterized in that a porous medium layer is arranged on the wall surface of an inner cavity of a die head body, and an air passage for introducing air is formed between the porous medium layer and the wall surface of the inner cavity, so that the air can pass through the porous medium layer to form an air film layer between slurry and the porous medium layer. On one hand, the gas film layer can obviously reduce the friction force between the slurry and the inner wall of the die head and effectively prevent the blockage problem of the high-viscosity slurry in the conveying process; and on the other hand, the slurry is in a suspended state due to the existence of the gas film layer, so that direct contact between the slurry and the inner wall of the die head is avoided, the uniformity of the slurry in the flowing process is ensured, and the quality of a coated product is favorably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of extrusion film forming, and in particular to an air-floating die head. Background Technology

[0002] With the booming development of industries such as new energy batteries and flexible displays, the importance of thin film preparation technology is becoming increasingly prominent. Currently, wet coating dies are a common type of coating equipment, typically operating at pressures between 0.1 MPa and 1 MPa, relying mainly on gravity and low-pressure pumping systems to complete the coating process. However, when the coating slurry has characteristics such as high solids content and high viscosity, using wet coating dies can easily lead to technical problems such as uneven coating and die clogging, which significantly affect product quality and production efficiency.

[0003] Another common preparation process is film formation using an extruder. This technology mainly involves heating and melting, followed by extrusion molding to produce films. However, semi-dry slurries, due to their unique rheological properties that fall between solid and liquid states, are prone to non-uniformity during extrusion. Even with a twin-screw extruder, although it can provide better shear force and mixing, the high viscosity of the slurry still leads to extrusion difficulties and the risk of clogging, which severely restricts the stable production of the product. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides an air-floating mold head that can prevent clogging and has good coating uniformity.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An air-float type mold head includes: a mold head body, wherein an inner cavity for slurry flow is formed within the mold head body, and the two ends of the inner cavity along its length are respectively connected to an inlet and an outlet; a porous media layer disposed on the wall surface of the inner cavity along its length, and air channels are arranged at intervals between the porous media layer and the wall surface of the inner cavity; wherein the air channels are used to introduce gas, and the gas forms an air film layer between the slurry in the inner cavity and the porous media layer after passing through the porous media layer.

[0007] Furthermore, a mixing chamber is formed at one end of the inner cavity near the feed inlet. A transverse screw is provided in the mixing chamber. The transverse screw applies shear force to the slurry through rotational motion to break up agglomerates in the slurry and promote slurry mixing.

[0008] Furthermore, the mold head body includes an upper mold and a lower mold, wherein the upper mold and the lower mold cooperate to form the inner cavity; wherein the porous medium layer includes a first porous medium layer disposed between the upper mold and the inner cavity; and a second porous medium layer disposed between the lower mold and the inner cavity.

[0009] Furthermore, a first air passage is formed between the upper mold and the first porous medium layer, and a second air passage is formed between the lower mold and the second porous medium layer; the upper mold is provided with a first air inlet, and the lower mold is provided with a second air inlet; the first air passage is connected to the first air inlet, and the second air passage is connected to the second air inlet.

[0010] Furthermore, a first mixing chamber is provided between the first air inlet and the first air passage; and a second mixing chamber is provided between the second air inlet and the second air passage.

[0011] Furthermore, a first discharge channel is formed at the ends of the upper mold and the lower mold, and the first discharge channel is connected to the discharge port; a second discharge channel is formed between the mixing chamber and the first discharge channel; an inclined surface is provided on the upper mold and / or the lower mold, and the inclined surface is used to connect the mixing chamber and the first discharge channel; wherein, the cross-sectional area of ​​the second discharge channel gradually decreases from the mixing chamber to the first discharge channel under the action of the inclined surface.

[0012] Furthermore, the porous media layer is disposed on the inner wall surface of the first discharge channel and the second discharge channel.

[0013] Furthermore, a gasket is provided between the upper mold and the lower mold, the thickness of the gasket being the height of the discharge port, and the gasket is used to seal the gap between the upper mold and the lower mold.

[0014] Furthermore, the cross-section of the airway is arc-shaped, wherein the straight edge of the arc is disposed opposite to the porous medium layer.

[0015] Furthermore, the porous medium layer is a porous graphite layer.

[0016] The beneficial effects of this utility model are:

[0017] This invention relates to an air-floating die head. A porous media layer is formed on the inner wall of the die head body, and an air channel is created between the porous media layer and the inner wall for gas introduction. This allows gas to pass through the porous media layer and form an air film layer between the slurry and the porous media layer. This air film layer significantly reduces the friction between the slurry and the inner wall of the die head, effectively preventing clogging of high-viscosity slurries during transport. Furthermore, the presence of the air film layer keeps the slurry in a suspended state, avoiding direct contact between the slurry and the inner wall of the die head, thus ensuring the uniformity of the slurry during flow and improving the quality of the coated product. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of the present invention;

[0021] Figure 3 This is a structural breakdown diagram of this utility model.

[0022] in,

[0023] 1. Die body;

[0024] 11. Upper mold; 111. First air inlet; 112. First air passage;

[0025] 12. Lower mold; 121. Second air inlet; 122. Second air passage;

[0026] 13. Inner cavity; 131. Mixing cavity; 132. First discharge channel; 133. Second discharge channel; 1331. Inclined surface;

[0027] 14. Horizontal screw; 15. Feed inlet; 16. Discharge outlet; 17. First porous media layer; 18. Second porous media layer; 19. Gasket. Detailed Implementation

[0028] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0029] Reference Figure 1-3 An air-float type die head includes: a die head body 1, wherein an inner cavity 13 for slurry flow is formed within the die head body 1, and the two ends of the inner cavity 13 along its length are respectively connected to an inlet 15 and an outlet 16; a porous media layer disposed on the wall surface of the inner cavity 13 along its length, and air channels are arranged at intervals between the porous media layer and the wall surface of the inner cavity 13; wherein the air channels are used to introduce gas, and the gas, after passing through the porous media layer, forms an air film layer between the slurry in the inner cavity 13 and the porous media layer. The slurry can enter the inner cavity 13 through the inlet 15 and flow along its length to the outlet 16. During the flow process, a uniform air film layer is formed between the high-viscosity slurry and the porous media layer, thereby achieving stable slurry delivery and coating, and avoiding the clogging problem caused by direct contact between the slurry and the wall surface of the inner cavity 13.

[0030] It should be noted that the porous media layer is a porous graphite layer, meaning it is made of porous graphite material. Porous graphite material possesses excellent porosity and gas conductivity, allowing gas to pass uniformly through the porous media layer and contact the slurry. Simultaneously, porous graphite material exhibits excellent wear resistance and chemical stability, preventing damage or deformation due to slurry erosion during long-term use. For example, in the preparation of lithium battery slurry coatings, porous graphite material can withstand the corrosion of organic solvents and conductive agents contained in the slurry, and its porous structure ensures uniform gas distribution, enabling the stable formation of the gas film layer, thereby guaranteeing the stability of the slurry transport process and the uniformity of the coating.

[0031] Furthermore, the cross-section of the air passage is arc-shaped, with the straight edge of the arc facing the porous media layer. The arc-shaped air passage can reduce turbulence and pressure loss generated when the airflow turns, while the facing of the straight edge to the porous media layer ensures that the gas can pass through the porous media layer with uniform pressure, forming a stable air film support, thereby enabling the slurry to obtain a more uniform and stable air flotation effect during the flow process.

[0032] In some embodiments, refer to Figure 2 The inner cavity 13 near the feed inlet 15 forms a mixing chamber 131, and a transverse screw 14 is disposed within the mixing chamber 131. It is understood that when the slurry enters the mixing chamber 131 from the feed inlet 15, the transverse screw 14 generates a shearing force on the slurry through its rotational motion. This shearing force can effectively break up agglomerates in the slurry and promote the uniformity of slurry mixing. For example, in the preparation of lithium battery slurry coating, conductive agents, binders, and other components in the slurry easily form agglomerates. Through the rotational shearing action of the transverse screw 14, these agglomerates can be broken up and the components can be fully mixed, thereby ensuring the uniformity of slurry components in subsequent coating processes, improving the consistency of the electrode coating and battery performance.

[0033] In some embodiments, refer to Figure 2-3 The die head body 1 includes an upper die 11 and a lower die 12, the upper die 11 and the lower die 12 cooperating to form the inner cavity 13; wherein, the porous media layer includes a first porous media layer 17 disposed between the upper die 11 and the inner cavity 13; and a second porous media layer 18 disposed between the lower die 12 and the inner cavity 13. By simultaneously providing air film support to the slurry through the upper and lower porous media layers, the slurry can be uniformly suspended at the center of the inner cavity 13 during flow, thereby achieving a more stable conveying effect.

[0034] Furthermore, refer to Figure 2 A first air channel 112 is formed between the upper mold 11 and the first porous medium layer 17, and a second air channel 122 is formed between the lower mold 12 and the second porous medium layer 18. The upper mold 11 is provided with a first air inlet 111, and the lower mold 12 is provided with a second air inlet 121. The first air channel 112 is connected to the first air inlet 111, and the second air channel 122 is connected to the second air inlet 121. It can be understood that the formation of the upper and lower air films can be controlled by adjusting the gas pressure of the first air inlet 111 and the second air inlet 121, thereby achieving precise control of the slurry flow state.

[0035] Further, continue to refer to Figure 2 A first mixing chamber is provided between the first air inlet 111 and the first air passage 112; a second mixing chamber is provided between the second air inlet 121 and the second air passage 122. Gas first enters the mixing chamber to achieve preliminary pressure equalization and disturbance elimination, and then is evenly distributed through the air passage, making the formed gas film layer more stable and avoiding unstable slurry flow caused by uneven local air pressure.

[0036] Furthermore, refer to Figure 2-3A gasket 19 is provided between the upper mold 11 and the lower mold 12. The thickness of the gasket 19 is the height of the discharge port 16, and the gasket 19 is used to seal the gap between the upper mold 11 and the lower mold 12. It should be noted that the main function of the gasket 19 is to seal the gap between the upper mold 11 and the lower mold 12 to prevent slurry and gas leakage. In addition, the gasket 19 can precisely control the height of the discharge port 16 to ensure the consistency of the coating thickness, while effectively preventing slurry leakage from both sides of the die head and avoiding gas escaping from unexpected positions, which would affect the air flotation effect.

[0037] In some embodiments, refer to Figure 2 The upper mold 11 and the lower mold 12 have a first discharge channel 132 at their ends, which communicates with the discharge port 16. A second discharge channel 133 is formed between the mixing chamber 131 and the first discharge channel 132. An inclined surface 1331 is provided on the upper mold 11 and / or the lower mold 12, connecting the mixing chamber 131 and the first discharge channel 132. The cross-sectional area of ​​the second discharge channel 133 gradually decreases from the mixing chamber 131 towards the first discharge channel 132 under the action of the inclined surface 1331. It is understood that the gradual decrease in the cross-sectional area of ​​the second discharge channel 133 gradually increases the slurry flow velocity while maintaining a stable pressure distribution, preventing eddies or dead zones from forming during the slurry flow, thus ensuring that the slurry flows out of the discharge port 16 uniformly, improving coating quality and uniformity.

[0038] It should be noted that, referring to Figure 2-3 The inclined surface 1331 can be set in the upper mold 11, while the lower mold 12 remains horizontal. The slurry, during its flow, will be gradually accelerated by the guiding effect of the inclined surface 1331 in the upper mold 11. Alternatively, the inclined surface 1331 can be set in the lower mold 12, while the upper mold 11 remains horizontal. The slurry, during its flow, will be gradually accelerated by the guiding effect of the inclined surface 1331 in the lower mold 12. The inclined surface 1331 can also be set in both the upper mold 11 and the lower mold 12. In this case, the slurry, during its flow, will be guided by both the upper and lower inclined surfaces 1331 simultaneously. For example, in the preparation of lithium battery slurry coating, a suitable setting of the inclined surface 1331 can be selected according to the characteristics of the slurry and the process requirements to achieve the best flow effect and coating quality.

[0039] Furthermore, the porous media layer is disposed on the inner wall surface of the first discharge channel 132 and the second discharge channel 133. It should be noted that the porous media layer is mainly disposed in the first discharge channel 132 and the second discharge channel 133, forming a continuous air film support effect within the discharge channels. The slurry can obtain the support and lubrication of the air film throughout the entire process of flowing from the mixing chamber 131 to the discharge port 16, avoiding friction and local accumulation caused by direct contact between the slurry and the channel wall, thereby ensuring that the slurry maintains a good flow state throughout the entire flow process.

[0040] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An air float die characterized by, The gas floating die comprises: a die body, an inner cavity for slurry flow is formed in the die body, the inner cavity is communicated with a feeding port and a discharging port at two ends along the length direction respectively; a porous medium layer is arranged on the wall of the inner cavity along the length direction of the inner cavity, and an air channel is arranged between the porous medium layer and the wall of the inner cavity; wherein, the air channel is used for introducing gas, and the gas forms a gas film layer between the slurry in the inner cavity and the porous medium layer after passing through the porous medium layer.

2. The gas floating die according to claim 1, wherein the inner cavity is formed with a mixing cavity near the feeding port, a transverse screw is arranged in the mixing cavity, the transverse screw applies shear force to the slurry through rotating movement, so as to break the agglomerates in the slurry and promote the mixing of the slurry.

3. The gas floating die according to claim 2, wherein the die body comprises an upper die and a lower die, the upper die and the lower die cooperate to form the inner cavity; wherein, the porous medium layer comprises: a first porous medium layer arranged between the upper die and the inner cavity; a second porous medium layer arranged between the lower die and the inner cavity.

4. The gas floating die according to claim 3, wherein a first air channel is formed between the upper die and the first porous medium layer, and a second air channel is formed between the lower die and the second porous medium layer; the upper die is provided with a first air inlet, and the lower die is provided with a second air inlet; the first air channel is communicated with the first air inlet, and the second air channel is communicated with the second air inlet.

5. The gas floating die according to claim 4, wherein the first air inlet and the first air channel have a first gas mixing cavity therebetween; the second air inlet and the second air channel have a second gas mixing cavity therebetween.

6. The gas floating die according to claim 3, wherein the end of the upper die and the lower die is formed with a first discharging channel, the first discharging channel is communicated with the discharging port; a second discharging channel is formed between the mixing cavity and the first discharging channel; a slope is arranged on the upper die and / or the lower die, the slope is used for connecting the mixing cavity and the first discharging channel; wherein, the cross-sectional area of the second discharging channel gradually decreases from the mixing cavity to the first discharging channel under the action of the slope.

7. The gas floating die according to claim 6, wherein the porous medium layer is arranged on the inner wall surface of the first discharging channel and the second discharging channel.

8. The gas floating die according to claim 3, wherein a gasket is arranged between the upper die and the lower die, the thickness of the gasket is the height of the discharging port, and the gasket is used for sealing the gap between the upper die and the lower die.

9. The gas floating die according to claim 1, wherein the cross section of the air channel is arc-shaped, and the straight side of the arc-shaped cross section is arranged opposite to the porous medium layer.

10. The gas floating die according to any one of claims 1-9, wherein the porous medium layer is a porous graphite layer.

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