Slit coating die for coating machine

Abstract

The present invention discloses a slit coating die for a coating machine, comprising an upper die and a lower die that match each other, a feed port and a die cavity being provided on the lower die, the upper die and the lower die forming a die lip gap, an adjustment block detachably connected to the lower die being provided in the die cavity, a pre-pressing surface being provided on the adjustment block, the pre-pressing surface and the lower die forming a pre-equalizing gap, the feed port, the die cavity, the pre-equalizing gap and the die lip gap being connected in sequence. The shape of the adjustment block is designed according to the actual rheological properties of the coating slurry, the adjustment block can change the structure of the die cavity after installation, so that the slit coating die is adapted to the properties of the slurry, ensuring the uniformity of its transverse coating, and only the adjustment block needs to be replaced when changing different slurries, so that the slit coating die can be applied to a variety of slurries, greatly reducing the cost of making the slit coating die, while the adjustment block and the die cavity form a pre-equalizing gap, increasing the pre-uniform distribution link of the slurry, and improving the precision of the transverse coating of the slit coating die.

Description

Technical Field

[0001] The present invention relates to the technical field of coating machines, in particular to a slit coating die head for a coating machine. Background Art

[0002] Currently, mainstream coating machines all use slot extruders, among which the slot die is the key coating device. Its function is to make the beam slurry uniformly distributed laterally and then evenly coated on the substrate. The key to the die is the structural design of the internal cavity and die lip, which determines the uniformity of the slurry's transverse coating, thereby determining the consistency of the product batch, which is crucial to the overall performance and pass rate of the product.

[0003] Current die designs are usually based on the actual rheological properties of the coating slurry, using dedicated fluid analysis software to analyze and design the die cavity and die lip structure. The die structure produced in this way is fixed and can only adapt to one slurry. When a certain parameter of the slurry changes, the uniformity of the lateral coating of the die will not meet the requirements. In order to achieve the best effect, it is necessary to replace the matching die, which will significantly increase the cost and is not conducive to reducing costs in actual production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a slit coating die head for a high-precision coating machine suitable for a variety of coating slurries.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a slit coating die for a coating machine, comprising a matching upper die and a lower die, the lower die is provided with a feed port and a cavity, the upper die and the lower die form a die lip gap, the cavity is provided with an adjustment block detachably connected to the lower die, the adjustment block is provided with a pre-pressing surface, the pre-pressing surface and the lower die form a pre-equalizing pressure gap, the feed port, the cavity, the pre-equalizing pressure gap and the die lip gap are connected in sequence.

[0006] The beneficial effects of the present invention are as follows: a detachable adjustment block is arranged in the cavity, and the shape of the adjustment block is designed according to the actual rheological characteristics of the coating slurry. After the adjustment block is installed, the structure of the cavity can be changed, so that the slit coating die for the coating machine is adapted to the characteristics of the slurry, thereby ensuring the uniformity of its transverse coating. When changing different slurries, only the corresponding adjustment block needs to be replaced, so that the slit coating die for the coating machine can be applied to a variety of slurries, which greatly reduces the cost of manufacturing the slit coating die for the coating machine. At the same time, the adjustment block and the cavity form a pre-equalizing gap, which increases the pre-uniform distribution link of the slurry and greatly improves the accuracy of the transverse coating of the slit coating die for the coating machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1This is a schematic structural diagram of a slit coating die head for a coating machine according to a first embodiment of the present invention;

[0008] Figure 2 This is a schematic structural diagram of the lower die and the adjustment block of the slot-type coating die for a coating machine according to the first embodiment of the present invention;

[0009] Figure 3 This is a front view of the lower die of the slit coating die for the coating machine according to the first embodiment of the present invention;

[0010] Figure 4 This is a front view of an adjustment block in a slot coating die for a coating machine according to a first embodiment of the present invention;

[0011] Figure 5 This is an assembly diagram of the lower die and the adjustment block of the slot coating die for a coating machine according to the first embodiment of the present invention;

[0012] Figure 6 Schematic diagram of the structure of the upper die in the slot coating die for a coating machine according to the second embodiment of the present invention;

[0013] Figure 7 This is a side view of the upper die in the slot coating die for a coating machine according to the second embodiment of the present invention.

[0014] Description of labels:

[0015] 1. Upper die head; 11. Upper die lip adjustment screw; 2. Lower die head; 21. Feed port; 22. Cavity; 23. Mounting hole; 24. Positioning protrusion; 25. Fillet; 3. Die lip gap; 4. Adjustment block; 41. Pre-compression surface; 411. Pre-equalizing pressure gap; 42. Positioning hole; 43. Groove; 44. Adjustment bottom surface; 5. Auxiliary gasket; 6. Gasket. DETAILED DESCRIPTION

[0016] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0017] The key concept of the present invention is to provide a detachable adjustment block in the cavity, thereby changing the internal structure of the cavity to adapt it to the characteristics of the slurry.

[0018] Please refer to Figures 1 to 7A slit coating die for a coating machine comprises a matching upper die 1 and a lower die 2, the lower die 2 being provided with a feed port 21 and a cavity 22, the upper die 1 and the lower die 2 forming a die lip gap 3, the cavity 22 being provided with an adjustment block 4 detachably connected to the lower die 2, the adjustment block 4 being provided with a pre-pressing surface 41, the pre-pressing surface 41 and the lower die 2 forming a pre-equalizing pressure gap 411, the feed port 21, the cavity 22, the pre-equalizing pressure gap 411 and the die lip gap 3 being connected in sequence.

[0019] The structural principle of the present invention is briefly described as follows: a detachable adjustment block 4 is arranged in the cavity 22. The shape of the adjustment block 4 is designed according to the actual rheological characteristics of the coating slurry. After the adjustment block 4 is installed, the structure of the cavity 22 can be changed, so that the slit coating die used by the coating machine is adapted to the characteristics of the slurry, thereby ensuring the uniformity of its lateral coating. When changing different slurries, only the corresponding adjustment block 4 needs to be replaced. At the same time, the adjustment block 4 and the cavity 22 form a pre-equalizing pressure gap 411, which adds a pre-uniform distribution link of the slurry.

[0020] From the above description, it can be seen that the beneficial effects of the present invention are: making the slit coating die for the coater applicable to a variety of slurries, greatly reducing the cost of manufacturing the slit coating die for the coater, and greatly improving the accuracy of the lateral coating of the slit coating die for the coater.

[0021] Furthermore, positioning holes 42 are respectively provided at both ends of the adjustment block 4 , and a mounting hole 23 matching the mounting hole 23 is provided on the lower die head 2 .

[0022] As can be seen from the above description, the lower die head 2 and the adjustment block 4 are connected by screws, the connection is reliable, and the installation and disassembly are convenient.

[0023] Furthermore, grooves 43 are respectively provided at both ends of the adjustment block 4 , and positioning protrusions 24 matching with the grooves 43 are provided on the lower die head 2 .

[0024] As can be seen from the above description, the adjusting block 4 and the lower die head 2 are positioned by the cooperation between the groove 43 and the positioning protrusion 24 , which makes positioning convenient and facilitates the installation of the adjusting block 4 on the lower die head 2 .

[0025] Furthermore, the adjustment block 4 is provided with an adjustment bottom surface 44 , and the adjustment bottom surface 44 is a plane, a curved surface, or a surface that changes regularly from the middle to both sides.

[0026] As can be seen from the above description, the surface of the adjustment block 4 is a plane, a curved surface, or a surface that changes regularly from the middle to both sides, so that the shape of the cavity 22 changes to adapt to different types of slurries.

[0027] Furthermore, an auxiliary gasket 5 is provided between the adjustment block 4 and the lower die head 2 , and the auxiliary gasket 5 is located on a side of the adjustment block 4 away from the pre-pressure equalizing gap 411 .

[0028] As can be seen from the above description, by providing auxiliary gaskets 5 of different thicknesses, the position of the adjustment block 4 can be changed, thereby changing the width of the pre-pressure equalization gap 411 to adapt it to the characteristics of the slurry.

[0029] Furthermore, a gasket 6 is provided between the upper die head and the lower die head, and the optimal width range of the pre-equalizing gap 411 is 1.10 to 1.3 times the thickness of the gasket 6 .

[0030] From the above description, it can be seen that the pre-equalizing gap 411 is in a certain ratio to the thickness of the gasket 6, so that the internal structure of the slit coating die head of the coater is adapted to the properties of the slurry, and the lateral distribution of the slurry can be uniform when it flows in the cavity 22.

[0031] Example 1

[0032] Please refer to Figures 1 to 5 Embodiment 1 of the present invention is: a slit coating die for a coating machine, comprising an upper die 1 and a lower die 2 that match each other, the lower die 2 being provided with a feed port 21 and a cavity 22, and optionally, a fillet 25 is provided at the connection between the feed port 21 and the cavity 22 to facilitate the entry of the slurry. The upper die head 1 and the lower die head 2 form a die lip gap 3, a gasket 6 is provided between the upper die head 1 and the lower die head 2, and the gasket 6 covers the middle layer between the upper die head 1 and the lower die head 2, and an adjustment block 4 detachably connected to the lower die head 2 is provided in the cavity 22, and a pre-pressing surface 41 is provided on the adjustment block 4, and the pre-pressing surface 41 and the lower die head 2 form a pre-equalizing pressure gap 411. Optionally, the optimal width range of the pre-equalizing pressure gap 411 is 1.10 to 1.3 times the thickness of the gasket 6, and an auxiliary gasket 5 is provided between the adjustment block 4 and the lower die head 2, and the auxiliary gasket 5 is located on the side of the adjustment block 4 away from the pre-equalizing pressure gap 411. By replacing the auxiliary gasket 5 of different thicknesses, the position of the adjustment block 4 can be changed, thereby changing the width of the pre-equalizing pressure gap 411. The feed port 21, the mold cavity 22, the pre-pressure equalization gap 411 and the die lip gap 3 are connected in sequence.

[0033] like Figure 1As shown, the working process of the slit coating die for the coating machine is: the slurry enters the cavity 22 from the feed port 21, the slurry flows upward in the feed port 21, flows left and right in the cavity 22, and flows upward after entering the pre-equalizing gap 411. At this time, the slurry is pre-distributed, and the slurry enters the die lip gap 3 from the pre-equalizing gap 411. At this time, the slurry is evenly distributed in the die lip gap 3 and flows out of the slit coating die from the die lip and is evenly coated on the substrate.

[0034] like Figure 2 、 Figure 3 and Figure 4 As shown, the adjustment block 4 has an adjustment bottom surface 44, which is a plane, a curved surface, or a surface that changes regularly from the middle to both sides. After the adjustment block 4 is installed in the lower die head 2, the shape of the cavity 22 changes, so that the slit coating die head of the coating machine is adapted to the properties of the slurry. The shape of the adjustment block 4 is designed according to the optimal center value of the liquid surface tension and rheological curve formed by the comprehensive characteristics of the slurry used, such as the material system, material batch, slurry viscosity, coating width, coating thickness and coating speed. When a certain characteristic of the slurry changes, the optimal center value of its liquid surface tension and rheological curve will also change accordingly. At this time, it is only necessary to replace the adjustment block 4 of a different shape so that the shape of the cavity 22 provided with the adjustment block 4 is adapted to the slurry. The adjustment block 4 cooperates with the cavity 22 to achieve uniform lateral distribution of the slurry, which greatly saves the cost of redesigning and manufacturing the die head. In this embodiment, positioning holes 42 are respectively provided at both ends of the adjustment block 4, and mounting holes 23 are provided on the lower die head 2 to match the positioning holes 42. The adjustment block 4 can be mounted on the lower die head 2 by passing screws through the positioning holes 42 and screwing them into the mounting holes 23. Preferably, grooves 43 are respectively provided at both ends of the adjustment block 4, and positioning protrusions 24 are provided on the lower die head 2 to match the grooves 43. The adjustment block 4 can be conveniently mounted on the lower die head 2 by matching the grooves 43 with the positioning protrusions 24.

[0035] Example 2

[0036] Please refer to Figure 6 and Figure 7The second embodiment of the present invention is another technical solution for the structure of the upper die head 1 based on the first embodiment. The difference from the first embodiment is only that the structure of the upper die head 1 is different. The upper die head 1 is provided with a plurality of upper die lip adjustment screws 11, which are arranged along the die lip direction. By adjusting the tightness of the die lip adjustment screws 11, the width of the die lip gap 3 can be adjusted. The upper die lip adjustment screws 11 are used in conjunction with the adjustment block 4. Only a small amount of adjustment of the tightness of the upper die lip adjustment screws 11 is required to achieve a good adjustment effect, thereby preventing the slit coating die head for the coating machine from being in a fatigue state for a long time and causing irreversible deformation and damage, thereby extending the service life of the slit coating die head for the coating machine. Optionally, the lower die head 2 is provided with a plurality of lower die lip adjustment screws, which are arranged along the die lip direction.

[0037] To sum up, the slit coating die head for the coating machine provided by the present invention can adapt to a variety of coating slurries by replacing the adjustment block, which greatly saves the cost of remaking the die head and improves the universality of the slit coating die head for the coating machine. The adjustment block is simple to position, reliably connected to the die head, and easy to disassemble and assemble. At the same time, the slit coating die head for the coating machine adds a pre-uniform distribution link, which improves the uniformity of the lateral distribution of the coating slurry and improves product quality.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A slit coating die for a coating machine, comprising an upper die and a lower die that cooperate with each other, wherein the lower die is provided with a feed port and a cavity, and the upper die and the lower die form a die lip gap, characterized in that: An adjustment block detachably connected to the lower die head is provided in the mold cavity, and a pre-pressing surface is provided on the adjustment block. The pre-pressing surface and the lower die head form a pre-equalizing pressure gap, and the feed port, the mold cavity, the pre-equalizing pressure gap and the die lip gap are sequentially connected; a plurality of upper die lip adjustment screws are provided on the upper die head, and the upper die lip adjustment screws are arranged along the die lip direction; a plurality of lower die lip adjustment screws are provided on the lower die head, and the lower die lip adjustment screws are arranged along the die lip direction; the shape of the adjustment block is designed according to the actual rheological properties of the coating slurry. After the adjustment block is installed, the structure of the mold cavity can be changed, so that the slit coating die head of the coating machine is adapted to the properties of the slurry; When changing to a different slurry, you only need to replace the corresponding adjustment block.

2. The slit coating die head for a coating machine according to claim 1, characterized in that: Positioning holes are respectively provided at both ends of the adjustment block, and mounting holes matching the positioning holes are provided on the lower die head.

3. The slit coating die for a coating machine according to claim 1, characterized in that: Grooves are respectively provided at both ends of the adjustment block, and positioning protrusions matched with the grooves are provided on the lower die head.

4. The slit coating die for a coating machine according to claim 1, wherein: The adjusting block is provided with an adjusting bottom surface, and the adjusting bottom surface is a plane or a surface that changes regularly from the middle to both sides.

5. The slit coating die for a coating machine according to claim 1, characterized in that: An auxiliary gasket is provided between the adjusting block and the lower die head, and the auxiliary gasket is located on a side of the adjusting block away from the pre-pressure equalizing gap.

6. The slit coating die for a coating machine according to claim 1, characterized in that: A gasket is provided between the upper die head and the lower die head, and the optimal width range of the pre-equalizing gap is 1.10 to 1.3 times the thickness of the gasket.

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