A multi-material, slot-die coating slot die head that mitigates interlayer erosion

Abstract

The application discloses a multi-material applicable interlayer erosion alleviating multi-layer slot coating slot die, which comprises a first coating module, a second coating module, an upstream temperature control movable block, a downstream temperature control movable block, an upstream flow rate control valve, a downstream flow rate control valve, a central gasket, an upstream slot control block, an upstream slot screw rod, a downstream slot control block and a downstream slot screw rod. When coating is performed, the upstream optical liquid glue passes through the inclined large slot gap between the upstream slot control block and the central gasket to control the flow rate, stabilize the upstream meniscus and the downstream optical liquid glue passes through the vertical small slot gap between the downstream slot control block and the central gasket to control the flow rate and ensure the film surface quality, so that multi-layer coating is realized and stability is ensured. The application meets the coating of various materials, the upstream temperature control movable block and the downstream temperature control movable block are replaced according to the coating layer formed by different materials, so that different manifolds are used to meet the multi-layer film of different materials and the preparation requirements of multi-material multi-layer film are met.

Description

Technical Field

[0001] The present invention relates to the technical field of coating machines, and in particular to a multi-layer slit coating slot die head suitable for alleviating interlayer erosion using multiple materials and a method for using the die. Background Art

[0002] Multilayer thin film fabrication technology, building upon traditional thin film processes, achieves multifunctional integration and enhanced performance by precisely controlling the number of material layers, thickness, and interface properties. It is a core technology in optoelectronics, semiconductors, flexible electronics, and other fields. With its exceptional material compatibility and performance optimization capabilities, this technology is now widely used in the production of key components for cutting-edge products such as high-end displays, energy storage devices, and optical components.

[0003] Multilayer thin film fabrication technology achieves enhanced optical, electrical, and mechanical properties by sequentially coating or depositing materials with different functionalities. A multilayer slot coating die delivers various liquid materials through different coating channels to the slot outlet, where they are sequentially applied to the substrate. This multilayer coating process can effectively enhance the optical and electrical properties of thin films or impart specialized functionalities such as conductivity, water resistance, and anti-reflection properties.

[0004] However, existing multilayer coating devices often use a simple stacked structure and are not optimized for the rheological properties of the coating material and the stability of the multilayer interface. This results in frequent interlayer erosion and diffusion or mixing at the coating interface, affecting the overall performance and reliability of the film. Furthermore, most existing multilayer coating devices are fixed outlet devices with non-adjustable slit widths and non-adjustable internal flow channels, which can only meet the coating requirements of a single fluid. Their scope of application is limited and lacks flexibility. This lack of flexibility in handling multiple coating materials, coupled with significant differences in fluid properties between different materials, can easily lead to uneven liquid flow and pressure at the outlet, further exacerbating interlayer erosion.

[0005] In view of this, how to design a slot coating die that can adapt to a variety of coating materials, mitigate interlayer erosion, and achieve stable multi-layer coating has become a key issue that the thin film coating industry urgently needs to solve. This requires not only improved uniformity and interfacial stability in the structural design of the device, but also precise control of the flow rate and pressure of different materials through multi-layer liquid fluid control technology to meet the industry's urgent demand for high-performance thin film coating processes. Summary of the Invention

[0006] In order to solve the above problems existing in the prior art, the present invention designs a multi-layer slit coating slot die head that can adapt to multiple coating materials and slow down interlayer erosion to achieve multi-layer coating stability.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a multi-layer slit coating slot die head suitable for slowing down interlayer erosion of multiple materials, comprising a first coating module, a second coating module, an upstream temperature control movable block, a downstream temperature control movable block, an upstream flow rate control valve, a downstream flow rate control valve, a central gasket, an upstream slit control block, an upstream slit screw, a downstream slit control block and a downstream slit screw; the central gasket is located between the first coating module and the second coating module, the upstream temperature control movable block is located in the top groove of the first coating module, and the downstream temperature control movable block is located in the top groove of the second coating module; the upstream slit control block Located in the bottom groove between the first coating module and the central gasket, the downstream slit control block is located in the bottom groove between the second coating module and the central gasket; the upstream slit screw passes through the first coating module and is connected to the upstream slit control block; the downstream slit screw passes through the second coating module and is connected to the downstream slit control block; the upstream flow rate control valve is installed on the upper part of the outer side of the first coating module, and is connected to the channel in the upstream temperature control active block through the channel in the first coating module; the downstream flow rate control valve is installed on the upper part of the outer side of the second coating module, and is connected to the channel in the downstream temperature control active block through the channel in the second coating module.

[0008] Furthermore, a rectangular groove is provided on the inner side of the top of the first coating module for accommodating the upstream temperature control movable block, which is fixed by bolts; a trapezoidal groove is provided on the inner side of the bottom for accommodating the upstream slit control block;

[0009] An arc-shaped manifold is provided on the inner wall of the upstream temperature control movable block;

[0010] Inside the upstream temperature control movable block, a liquid storage tank is provided below the arc-shaped manifold;

[0011] A channel is provided inside the first coating module, a liquid inlet of the channel is fixedly connected to an upstream flow rate control valve, and a liquid outlet of the channel is communicated with a manifold;

[0012] A rectangular groove is provided on the inner side of the top of the second coating module for accommodating the downstream temperature control movable block, which is fixed by bolts; a trapezoidal groove is provided on the inner side of the bottom for accommodating the downstream slit control block;

[0013] An arc-shaped manifold is provided on the inner wall of the downstream temperature control movable block;

[0014] Inside the downstream temperature control movable block, a liquid storage tank is provided below the arc-shaped manifold;

[0015] A channel is provided inside the second coating module, a liquid inlet of the channel is fixedly connected to a downstream flow rate control valve, and a liquid outlet of the channel is communicated with a manifold.

[0016] Furthermore, the first coating module and the second coating module are separated by the central gasket and fixed by bolts.

[0017] Furthermore, the depth h2 of the trapezoidal groove opened on the inner side of the bottom of the first coating module is less than the overall thickness h1 of the upstream slit control block; the depth h4 of the trapezoidal groove opened on the inner side of the bottom of the second coating module is less than the overall thickness h3 of the downstream slit control block.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When the present invention is coating the product, the upstream optical liquid glue controls the flow rate through the inclined large slit gap between the upstream slit control block and the central gasket to stabilize the upstream meniscus, and the downstream optical liquid glue controls the flow rate through the vertical small slit gap between the downstream slit control block and the central gasket to ensure the surface quality of the film, thereby realizing multi-layer coating and ensuring stability.

[0020] 2. The present invention can meet the coating needs of various materials. The upstream temperature control movable block and the downstream temperature control movable block are replaced for the coatings to be formed by different materials, so that different manifolds can be used to meet the needs of multi-layer films of different materials. In combination with the selection of central gaskets, various internal flow channel designs of slot die heads can be carried out to meet the preparation needs of multi-material multi-layer films.

[0021] 3. The present invention preheats a variety of optical liquid adhesives into semi-colloids at a suitable temperature inside the slot die head through internal preheating of the upstream and downstream temperature control movable blocks. Combined with the flow channel design, it can greatly slow down interlayer erosion, improve production efficiency and stability, increase the variety of products that can be produced, and achieve better process adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention (assembly drawing);

[0023] Figure 2 for Figure 1 Rear view (exploded view);

[0024] Figure 3 for Figure 1 Schematic cross-section of .

[0025] In the figure: 1-first coating module; 2-second coating module; 3-upstream temperature control movable block; 4-downstream temperature control movable block; 5-upstream flow rate control valve; 6-downstream flow rate control valve; 7-central gasket; 8-upstream slit control block; 9-upstream slit screw; 10-downstream slit control block; 11-downstream slit screw. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-3 As shown, a multi-layer slit coating slot die head for multi-materials suitable for slowing down interlayer erosion includes a first coating module 1, a second coating module 2, an upstream temperature control movable block 3, a downstream temperature control movable block 4, an upstream flow rate control valve 5, a downstream flow rate control valve 6, a central gasket 7, an upstream slit control block 8, an upstream slit screw 9, a downstream slit control block 10 and a downstream slit screw 11; the central gasket 7 is located between the first coating module 1 and the second coating module 2, the upstream temperature control movable block 3 is located in the top groove of the first coating module 1, and the downstream temperature control movable block 4 is located in the top groove of the second coating module 2; the upstream slit control block 8 is located in the first coating module 1 and the central gasket 7, the downstream slit control block 10 is located in the bottom groove between the second coating module 2 and the central gasket 7; the upstream slit screw 9 passes through the first coating module 1 and is connected to the upstream slit control block 8; the downstream slit screw 11 passes through the second coating module 2 and is connected to the downstream slit control block 10; the upstream flow rate control valve 5 is installed on the upper part of the outer side of the first coating module 1, and is connected to the channel in the upstream temperature control active block 3 through the channel in the first coating module 1; the downstream flow rate control valve 6 is installed on the upper part of the outer side of the second coating module 2, and is connected to the channel in the downstream temperature control active block 4 through the channel in the second coating module 2.

[0028] Furthermore, a rectangular groove is provided on the inner side of the top of the first coating module 1 for placing the upstream temperature control movable block 3, which is fixed by bolts; a trapezoidal groove is provided on the inner side of the bottom for placing the upstream slit control block 8;

[0029] The inner wall of the upstream temperature control movable block 3 is provided with an arc-shaped manifold;

[0030] Inside the upstream temperature control movable block 3, a liquid storage tank is provided below the arc-shaped manifold;

[0031] A channel is provided inside the first coating module 1, the liquid inlet of the channel is fixedly connected to the upstream flow rate control valve 5, and the liquid outlet of the channel is communicated with the manifold;

[0032] A rectangular groove is provided on the inner side of the top of the second coating module 2 for placing the downstream temperature control movable block 4, which is fixed by bolts; a trapezoidal groove is provided on the inner side of the bottom for placing the downstream slit control block 10;

[0033] The inner wall of the downstream temperature control movable block 4 is provided with an arc-shaped manifold;

[0034] Inside the downstream temperature control movable block 4, a liquid storage tank is provided below the arc-shaped manifold;

[0035] A channel is provided inside the second coating module 2 , a liquid inlet of the channel is fixedly connected to the downstream flow rate control valve 6 , and a liquid outlet of the channel is communicated with the manifold.

[0036] Furthermore, the first coating module 1 and the second coating module 2 are separated by the central gasket 7 and fixed by bolts.

[0037] Furthermore, the depth h2 of the trapezoidal groove opened on the inner side of the bottom of the first coating module 1 is less than the overall thickness h1 of the upstream slit control block 8; the depth h4 of the trapezoidal groove opened on the inner side of the bottom of the second coating module 2 is less than the overall thickness h3 of the downstream slit control block 10.

[0038] The steps of adjusting the internal flow channel and slit width according to various coating materials are as follows:

[0039] First, according to the thickness of each layer of the multi-layer film and the materials used, select the appropriate upstream temperature control movable block 3, downstream temperature control movable block 4 and central gasket 7, and insert the selected upstream temperature control movable block 3 and downstream temperature control movable block 4 into the rectangular groove opened on the inner side of the top of the first coating module 1 and the rectangular groove opened on the inner side of the top of the second coating module 2 respectively.

[0040] Next, manually adjust the upstream slit screw 9 and downstream slit screw 11 counterclockwise to reposition the upstream slit control block 8 and downstream slit control block 10 to the central spacer 7. Then, depending on the desired multilayer film to be produced, rotate the corresponding upstream slit screw 9 and downstream slit screw 11 clockwise, driving the upstream slit control block 8 and downstream slit control block 10 outward until the desired slit width is achieved. Subsequently, preheating of the upstream and downstream temperature control movable blocks 3 and 4 is initiated based on the film thickness.

[0041] The optical liquid adhesive to be applied flows through upstream and downstream flow rate control valves 5 and 6, respectively, into the manifolds of the upstream and downstream temperature-controlled movable blocks 3 and 4. During this process, the optical liquid adhesive is heated to a semi-colloidal state. After filling the manifolds, the upstream optical liquid adhesive flows into the large, inclined slit gap between the upstream slit control block 8 and the central gasket 7. Its slow flow rate stabilizes the upstream meniscus. The downstream optical liquid adhesive flows into the small, perpendicular slit gap between the downstream slit control block 10 and the central gasket 7. Its faster flow rate ensures the film's surface quality.

[0042] As described above, for ordinary technicians in this field, various other corresponding changes and modifications can be made based on the technical solutions and technical concepts of the present invention, and all these changes and modifications should fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-layer slot coating die head suitable for multi-materials and mitigating interlayer erosion, characterized by: The invention comprises a first coating module (1), a second coating module (2), an upstream temperature control movable block (3), a downstream temperature control movable block (4), an upstream flow rate control valve (5), a downstream flow rate control valve (6), a central gasket (7), an upstream slit control block (8), an upstream slit screw rod (9), a downstream slit control block (10) and a downstream slit screw rod (11); the central gasket (7) is located between the first coating module (1) and the second coating module (2); the upstream temperature control movable block (3) is located in the top groove of the first coating module (1); the downstream temperature control movable block (4) is located in the top groove of the second coating module (2); the upstream slit control block (8) is located at the bottom between the first coating module (1) and the central gasket (7); The downstream slit control block (10) is located in the bottom groove between the second coating module (2) and the central gasket (7); the upstream slit screw (9) passes through the first coating module (1) and is connected to the upstream slit control block (8); the downstream slit screw (11) passes through the second coating module (2) and is connected to the downstream slit control block (10); the upstream flow rate control valve (5) is installed on the upper part of the outer side of the first coating module (1) and is connected to the channel in the upstream temperature control movable block (3) through the channel in the first coating module (1); the downstream flow rate control valve (6) is installed on the upper part of the outer side of the second coating module (2) and is connected to the channel in the downstream temperature control movable block (4) through the channel in the second coating module (2).

2. A multi-layer slot coating die head for multi-materials and suitable for mitigating interlayer erosion according to claim 1, characterized in that: A rectangular groove is provided on the inner side of the top of the first coating module (1) for accommodating an upstream temperature control movable block (3) fixed by bolts; a trapezoidal groove is provided on the inner side of the bottom for accommodating an upstream slit control block (8); An arc-shaped manifold is provided on the inner wall of the upstream temperature control movable block (3); Inside the upstream temperature control movable block (3), a liquid storage tank is provided below the arc-shaped manifold; A channel is provided inside the first coating module (1), a liquid inlet of the channel is fixedly connected to an upstream flow rate control valve (5), and a liquid outlet of the channel is communicated with a manifold; A rectangular groove is provided on the inner side of the top of the second coating module (2) for accommodating a downstream temperature control movable block (4) fixed by bolts; a trapezoidal groove is provided on the inner side of the bottom for accommodating a downstream slit control block (10); An arc-shaped manifold is provided on the inner wall of the downstream temperature control movable block (4); Inside the downstream temperature control movable block (4), a liquid storage tank is provided below the arc-shaped manifold; A channel is provided inside the second coating module (2), a liquid inlet of the channel is fixedly connected to a downstream flow rate control valve (6), and a liquid outlet of the channel is communicated with a manifold.

3. The multi-layer slot coating die head for multi-material coating suitable for mitigating interlayer erosion according to claim 1, characterized in that: The first coating module (1) and the second coating module (2) are separated by the central gasket (7) and fixed by bolts.

4. The multi-layer slot coating die head for multi-material coating suitable for mitigating interlayer erosion according to claim 1, characterized in that: The depth h2 of the trapezoidal groove formed on the inner side of the bottom of the first coating module (1) is less than the overall thickness h1 of the upstream slit control block (8); and the depth h4 of the trapezoidal groove formed on the inner side of the bottom of the second coating module (2) is less than the overall thickness h3 of the downstream slit control block (10).

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