Multi-layer slit coating groove die head suitable for retarding interlayer erosion and made of multiple materials

Abstract

The invention discloses a multi-layer slit coating groove die head suitable for retarding interlayer erosion for 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 speed control valve, a downstream flow speed control valve, a central gasket, an upstream slit control block, an upstream slit screw rod, a downstream slit control block and a downstream slit screw rod. During coating, the flow velocity of upstream optical liquid glue is controlled through an inclined large slit gap between the upstream slit control block and the central gasket to stabilize an upstream meniscus, and the flow velocity of downstream optical liquid glue is controlled through a vertical small slit gap between the downstream slit control block and the central gasket to ensure the surface quality of a thin film, so that multi-layer coating is realized; the stability is ensured. According to the multi-material multi-layer film coating device, coating of various materials is met, the upstream temperature control movable block and the downstream temperature control movable block are replaced for coatings to be formed by different materials, so that different manifolds are used for meeting multi-layer films of different materials, and the multi-material multi-layer film preparation requirements are met.

Description

Technical Field

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

[0002] Multilayer thin film preparation technology is an advanced manufacturing process that achieves multifunctional integration and high performance improvement by precisely controlling the number of material layers, thickness and interface characteristics based on traditional thin film technology. It is one of the core technologies in the fields of optoelectronics, semiconductors, and flexible electronics. With its excellent material compatibility and performance optimization capabilities, this technology has been widely used in the production of key components of cutting-edge products such as high-end displays, energy storage devices, and optical components.

[0003] The multi-layer thin film preparation technology can give the thin film system higher optical, electrical and mechanical properties by coating or depositing materials with different functions layer by layer. When the multi-layer slit coating slot die is working, it transports a variety of liquid materials to the slit outlet through different coating channels and coats them on the substrate in turn. Through the realization of multi-layer coating, the optical and electrical properties of the film can be effectively enhanced, or it can be given special functions such as conductivity, waterproofness, anti-reflection, etc.

[0004] However, most existing multilayer coating devices use a simple stacked structure and are not optimized for the rheological properties of the coating material and the stability of the multilayer interface, resulting in frequent interlayer erosion and diffusion or mixing at the coating interface, affecting the overall performance and reliability of the film. Moreover, most existing multilayer coating devices are fixed outlet devices with non-adjustable slit width and non-adjustable internal flow channels, which can only meet the coating requirements of a single fluid. The scope of their application is limited and lacks flexibility. There is a lack of flexibility in dealing with a variety of coating materials, and the fluid properties of different materials vary greatly, which can easily cause 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, has the function of slowing down interlayer erosion, and can achieve multi-layer coating stability has become a key issue that the thin film coating industry needs to solve urgently. This not only requires the device to improve the uniformity and interface stability of multi-layer coating in structural design, but also requires the 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 aims to design a multi-material slit coating slot die head which can adapt to a variety of coating materials and slow down interlayer erosion to achieve multi-layer coating stability.

[0007] In order to achieve the above-mentioned purpose, the technical scheme 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 placing an upstream temperature control movable block, which is fixed by bolts; a trapezoidal groove is provided on the inner side of the bottom for placing an 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 arranged 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 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 as to use different manifolds to meet the multi-layer films of different materials. With the selection of the central gasket, various internal flow channel designs of the slot die heads are carried out to meet the preparation requirements of multi-material multi-layer films.

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

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

[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 in conjunction with 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, 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;

[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 a downstream flow rate control valve 6 , and a liquid outlet of the channel is communicated with a 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 the slit width according to various coating materials of the present invention 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] Secondly, manually adjust the upstream slit screw 9 and the downstream slit screw 11 counterclockwise to change the position of the upstream slit control block 8 and the downstream slit control block 10 to the central gasket 7. After that, according to the multilayer film to be prepared, the corresponding upstream slit screw 9 and the downstream slit screw 11 are rotated clockwise, and the upstream slit screw 9 and the downstream slit screw 11 drive the upstream slit control block 8 and the downstream slit control block 10 to move outward until the desired slit width is reached and the rotation stops. Subsequently, the upstream temperature control movable block 3 and the downstream temperature control movable block 4 start preheating according to the film thickness.

[0041] The optical liquid glue to be coated enters the manifolds of the upstream temperature control movable block 3 and the downstream temperature control movable block 4 from the upstream flow rate control valve 5 and the downstream flow rate control valve 6 respectively. In this process, the optical liquid glue is heated to become semi-colloid. After filling the manifold, the upstream optical liquid glue enters the inclined large slit gap between the upstream slit control block 8 and the central gasket 7. The slow flow rate can stabilize the upstream meniscus. The downstream optical liquid glue enters the vertical small slit gap between the downstream slit control block 10 and the central gasket 7. The flow rate is fast, which can ensure the surface quality of the film.

[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 protection scope of the claims of the present invention.

Claims

1. A multi-layer slit coating slot die head suitable for slowing down interlayer erosion of multiple materials, 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 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).

2. According to claim 1, a multi-material multi-layer slit coating slot die suitable for slowing down interlayer erosion, 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); The inner wall of the upstream temperature control movable block (3) is provided with an arc-shaped manifold; 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); The inner wall of the downstream temperature control movable block (4) is provided with an arc-shaped manifold; 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. According to claim 1, a multi-material multi-layer slit coating slot die suitable for slowing down interlayer erosion, 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. According to claim 1, a multi-material multi-layer slit coating slot die suitable for slowing down interlayer erosion, 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); 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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