A high uniformity glue coating die head and flow control method thereof

Abstract

The present application belongs to the technical field of glue coating, and discloses a high-uniformity glue coating die head and a flow control method thereof. By respectively arranging adjustable pressure regulating plates and flow equalizing plates in the upper mold cavity and the lower mold cavity, a multi-stage flow channel is formed, which effectively improves the flow uniformity of the coating. At the same time, the glue coating flow rate can be accurately controlled by adjusting the width of the first gap, which can meet the needs of large-size and high-uniformity glue coating, and has a simple structure, low manufacturing cost, and low maintenance difficulty.

Description

Technical Field

[0001] The present application relates to the field of glue coating technology, and in particular to a high-uniformity glue coating die head and a flow control method thereof. Background Art

[0002] Slit coating technology is a high-precision coating technology with a wide range of applications in optoelectronics, semiconductors, fuel cells, solar energy and other industries. In recent years, printed circuit boards (PCBs), flat panel display devices, thin-film solar cells (OPV, perovskite), fuel cell membranes and wearable electronic products have developed rapidly. These products have very high coating quality and application requirements, so corresponding coating technology is required to achieve high-precision uniform coating under large-size and ultra-thin layer coating or non-continuous coating requirements. For example, the coating area of ​​the G6 generation flat panel display is as high as 1500mm*1500mm, the coating thickness is only about 10 microns, and the uniformity of the coating thickness is required to be ≤±3%. This kind of coating with such high error accuracy on an ultra-large substrate places higher requirements on the design and control of the slit coating die head.

[0003] The existing slit-type glue coating dies on the market are difficult to meet the technical index requirements of the above-mentioned high-precision, large-size substrate coating. In addition, the cost of the entire die, the complexity of the structure, the convenience of maintenance, the uniformity of the coating, and the convenience of controlling the thickness of the coating film all have defects to varying degrees, and cannot guarantee the precision index requirements of large-size, high-uniformity coating plating.

[0004] For example, a Chinese patent with application number 202280000424.0 discloses a glue coating die head, which is divided into an upper die and a lower die, and a glue coating slit is formed between the upper die and the lower die, and the glue coating slit is suitable for the circulation of the coating, and the material of the slit forming surface of the glue coating slit adopts a ceramic material to improve the wear resistance and corrosion resistance of the slit forming surface of the glue coating slit. The overall structure of the glue coating die head is relatively complex, and a large amount of high-priced composite ceramic metal materials are used, and the overall manufacturing cost is very high. At the same time, the buffer cavity of the glue coating die head is a cavity with a hemispherical cross-section. After the coating is introduced into the die head through a blind hole set in the middle of the die head, it is relatively slow to evenly fill the entire buffer cavity with a length of more than 1000mm, resulting in the final coating in the process of glue coating. The uniformity of the thickness of the glue film layer in the middle and both sides of the substrate is difficult to achieve the accuracy requirement of ≤±3%.

[0005] The Chinese patent with application number 202280000442.9 discloses a glue coating die head, including an upper die, a lower die and a first adjustment mechanism, wherein the upper die and the lower die together form a glue coating slit suitable for the circulation of the coating. The glue coating die head can avoid increasing the height of the whole machine, reduce the space occupied by the first adjustment mechanism in the height direction of the whole machine, facilitate packaging and transportation, and avoid damage caused by collision. However, at the same time, the overall size and weight of the glue coating die head are relatively large, and the glue coating die head has many connecting parts, and the overall sealing stability is poor. The glue coating uniformity, stability, and cost-effectiveness of equipment manufacturing do not meet the glue coating accuracy requirements of G6 size display substrates.

[0006] Therefore, it is necessary to seek a high-uniformity glue coating die and a flow control method thereof to meet the needs of large-size, high-uniformity glue coating and reduce the cost, structural complexity and maintenance difficulty of the glue coating die. Summary of the invention

[0007] The purpose of this application is to provide a high-uniformity glue coating die head and a flow control method thereof, which can meet the needs of large-size and high-uniformity glue coating, and has a simple structure, low manufacturing cost and low maintenance difficulty.

[0008] In a first aspect, the present application provides a high uniformity glue coating die head, comprising a die head body, wherein a feed port is arranged at the top of the die head body, and a glue coating slit extending in the left-right direction is arranged at the bottom of the die head body; an upper die cavity and a lower die cavity are sequentially arranged up and down and connected to each other in the die head body, the feed port is connected to the top of the upper die cavity, and the glue coating slit is connected to the bottom of the lower die cavity;

[0009] A plurality of first pressure regulating plates arranged at intervals in the upper and lower directions and a plurality of second pressure regulating plates arranged at intervals in the upper and lower directions are arranged in the upper mold cavity, the first pressure regulating plates and the second pressure regulating plates respectively cover the front half and the rear half of the upper mold cavity, the rear side of the first pressure regulating plates and the front side of the second pressure regulating plates are alternately arranged from top to bottom in the middle of the upper mold cavity, so as to form a first gap extending in the left-right direction between any adjacent first pressure regulating plates and second pressure regulating plates, the first gap is used for the coating to pass through and the width of the first gap is adjustable;

[0010] The lower mold cavity is provided with a plurality of first flow equalizing plates arranged along the upper and lower intervals and a plurality of second flow equalizing plates arranged along the upper and lower intervals, the first flow equalizing plates and the second flow equalizing plates respectively cover the front half and the rear half of the lower mold cavity, the rear side of the first flow equalizing plates and the front side of the second flow equalizing plates are alternately arranged from top to bottom in the middle of the lower mold cavity to form a second gap extending in the left and right direction between any adjacent first flow equalizing plates and second flow equalizing plates, the second gap is used for allowing the paint to pass through.

[0011] By respectively arranging adjustable pressure regulating plates and flow equalizing plates in the upper mold cavity and the lower mold cavity, a multi-stage flow channel is formed, which effectively improves the flow uniformity of the coating. At the same time, by adjusting the width of the first gap, the glue flow rate can be accurately controlled, which can meet the needs of large-size and high-uniformity glue coating. It has a simple structure, low manufacturing cost and low maintenance difficulty.

[0012] Preferably, the first pressure regulating plate and the second pressure regulating plate are both arranged at an inclination, the rear side of the first pressure regulating plate is higher than the front side, and the front side of the second pressure regulating plate is higher than the rear side.

[0013] By setting the first pressure regulating plate and the second pressure regulating plate in an inclined state, the flow path of the paint in the upper mold cavity can be changed. This staggered inclined setting can cause the paint to form a serpentine flow path in the upper mold cavity, increase the flow distance and mixing degree of the paint, and form multiple inclined first storage cavities. After the paint enters each first storage cavity, it first fills the first storage cavity and then overflows from the first gap, which can ensure that the paint flows out evenly in the entire left and right directions, further improving the uniformity of coating.

[0014] Preferably, the first current balancing plate and the second current balancing plate are both arranged at an inclination, the rear side of the first current balancing plate is higher than the front side, and the front side of the second current balancing plate is higher than the rear side.

[0015] By setting the first flow equalizing plate and the second flow equalizing plate to an inclined state, the flow path of the coating in the lower mold cavity can be changed. This staggered inclined setting can cause the coating to form a serpentine flow path in the lower mold cavity, further increase the flow distance and mixing degree of the coating, and form multiple inclined second storage cavities. After the coating enters each second storage cavity, it first fills the second storage cavity and then overflows from the second gap. On the one hand, it can ensure that the coating flows out evenly in the entire left and right directions, further improving the uniformity of coating. On the other hand, it can separate the bubbles that may exist in the coating during the flow process to prevent the bubbles from affecting the uniformity of the coating process.

[0016] Preferably, the front side of the first pressure regulating plate and the rear side of the second pressure regulating plate are both rotatably connected to the cavity wall of the upper mold cavity; an adjustment mechanism is also provided on the die head body, and the adjustment mechanism is used to adjust the inclination angle of the first pressure regulating plate and the second pressure regulating plate to adjust the width of the first gap.

[0017] Preferably, the front edge of the first pressure regulating plate and the rear edge of the second pressure regulating plate are both covered with a liquid-proof sealing film.

[0018] Preferably, the first flow balancing plate and the second flow balancing plate are both fixedly connected to the cavity wall of the lower mold cavity, all edges of the first flow balancing plate except the rear edge are in contact with the cavity wall of the lower mold cavity, and all edges of the second flow balancing plate except the front edge are in contact with the cavity wall of the lower mold cavity.

[0019] Preferably, the die head body includes an upper cover plate, an upper cavity shell and a lower cavity shell; the upper cover plate is connected to the top of the upper cavity shell by a flange, and forms the upper mold cavity together with the upper cavity shell, the feed port is arranged on the upper cover plate, and the bottom of the upper cavity shell is an open structure; the lower cavity shell forms the lower mold cavity and is connected to the bottom of the upper cavity shell by a flange, the top of the lower cavity shell is an open structure, and the glue coating slit is opened at the bottom of the lower cavity shell.

[0020] Preferably, fine-tuning mechanisms are provided on both left and right sides of the upper end of the upper cavity shell, and the fine-tuning mechanisms are used to connect with the glue coating machine and adjust the horizontality of the high uniformity glue coating die head in the left and right directions.

[0021] In a second aspect, the present application provides a flow control method for controlling the high uniformity coating die head described above, comprising the steps of:

[0022] A1. Calculate the preferred dynamic pressure of the glue coating slit and the preferred distance between the coating lip of the glue coating slit and the coated substrate according to the target coating thickness and the preset coating speed;

[0023] A2. adjusting the height of the high uniformity coating die head so that the distance between the coating lip of the coating slit and the coated substrate is the preferred distance;

[0024] A3. adjusting the width of the first gap according to the preferred dynamic pressure of the glue slit;

[0025] A4. After adjusting the distance between the coating lip of the coating slit and the coated substrate and the width of the first gap, coating the coated substrate at the preset coating speed.

[0026] Preferably, in step A1, the preferred dynamic pressure of the glue coating slit and the preferred distance between the coating lip of the glue coating slit and the coated substrate are solved according to the following formula:

[0027] ;

[0028] ;

[0029] ;

[0030] ;

[0031] ;

[0032] ;

[0033] in, is the output flow rate of the glue-coated slit, is the width of the glue-coating slit, is the depth of the glue-coated slit, is the preferred dynamic pressure of the glue-coated slit, is the dynamic pressure at the middle of the gap between the coating lip of the coating slit and the coated substrate, is the dynamic viscosity constant of the coating, is the preset coating speed, is the target coating thickness, is the flow rate of the coating material flowing out from the front lip of the coating slit, is the preferred distance between the front lip of the coating slit and the coated substrate, is the dynamic pressure at the front lip of the glue-coating slit, is the width of the front lip of the glue slit, is the air pressure at the front lip of the glue-coating slit, is the flow rate of the coating material flowing out from the rear lip of the coating slit, is the preferred distance between the back lip of the coating slit and the coated substrate, is the dynamic pressure at the rear lip of the glue-coating slit, is the width of the rear lip of the glue slit, is the air pressure at the rear lip of the glue-coating slit, It is the height difference between the front lip and the rear lip of the glue coating slit.

[0034] Beneficial effects: The high-uniformity glue coating die head and its flow control method provided in the present application form a multi-stage flow channel by respectively arranging an adjustable pressure regulating plate and a flow equalizing plate in the upper mold cavity and the lower mold cavity, thereby effectively improving the flow uniformity of the coating. At the same time, the glue coating flow rate can be accurately controlled by adjusting the width of the first gap, which can meet the needs of large-size and high-uniformity glue coating, and has a simple structure, low manufacturing cost, and low maintenance difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A cross-sectional view of a high uniformity coating die provided in an embodiment of the present application.

[0036] Figure 2 A three-dimensional diagram of a high uniformity coating die provided in an embodiment of the present application.

[0037] Figure 3 It is a structural schematic diagram of the second voltage regulating plate.

[0038] Figure 4 A schematic diagram of the structure of an exemplary regulating mechanism.

[0039] Figure 5 A flow chart of a flow control method provided in an embodiment of the present application.

[0040] Figure 6 This is a diagram illustrating some of the calculation parameters involved in the flow control method.

[0041] Explanation of reference numerals: 1. die body; 101. feed port; 102. glue coating slit; 103. upper die cavity; 104. lower die cavity; 105. first gap; 106. second gap; 2. first pressure regulating plate; 3. second pressure regulating plate; 4. first flow equalizing plate; 5. second flow equalizing plate; 6. adjusting mechanism; 601. adjusting shaft; 602. motor; 603. first bevel gear; 604. second bevel gear; 605. reducer; 7. liquid leakage-proof sealing film; 8. upper cover plate; 9. upper cavity shell; 901. fixing seat; 10. lower cavity shell; 1001. raised portion; 11. sealing ring; 12. electronic liquid leakage alarm; 90. coated substrate. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0043] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0044] For the convenience of description, the directions in this application are described with a high uniformity coating die head. Figure 1 The placement direction in is based on the Figure 1 The up and down directions in the same Figure 1The left direction is consistent with Figure 1 The right direction is consistent with that of Figure 1 The direction perpendicular to the paper surface; the description of the front, back, left, and right directions does not limit the orientation in actual use.

[0045] Please refer to Figure 1-Figure 4 In some embodiments of the present application, a high uniformity glue coating die head includes a die head body 1, a feed inlet 101 is provided at the top of the die head body 1, and a glue coating slit 102 extending in the left-right direction is provided at the bottom of the die head body 1; the die head body 1 has an upper die cavity 103 and a lower die cavity 104 which are sequentially arranged up and down and connected to each other, the feed inlet 101 is connected to the top of the upper die cavity 103, and the glue coating slit 102 is connected to the bottom of the lower die cavity 104;

[0046] A plurality of first pressure regulating plates 2 arranged at intervals in the upper and lower directions and a plurality of second pressure regulating plates 3 arranged at intervals in the upper and lower directions are arranged in the upper mold cavity 103. The first pressure regulating plates 2 and the second pressure regulating plates 3 respectively cover the front half and the rear half of the upper mold cavity 103 (the first pressure regulating plate 2 covers the front half in the upper and lower directions, and the second pressure regulating plate 3 covers the rear half in the upper and lower directions). The rear side of the first pressure regulating plate 2 and the front side of the second pressure regulating plate 3 are alternately arranged from top to bottom in the middle of the upper mold cavity 103 to form a first gap 105 extending in the left-right direction between any adjacent first pressure regulating plates 2 and second pressure regulating plates 3. The first gap 105 is used for the coating (in the form of slurry) to pass through, and the width of the first gap 105 (the width of the first gap 105 is equal to the minimum distance between the first pressure regulating plate 2 and the second pressure regulating plate 3 that form the first gap 105) is adjustable;

[0047] The lower mold cavity 104 is provided with a plurality of first flow equalizing plates 4 arranged along the upper and lower intervals and a plurality of second flow equalizing plates 5 arranged along the upper and lower intervals. The first flow equalizing plates 4 and the second flow equalizing plates 5 respectively cover the front half and the rear half of the lower mold cavity 104 (the first flow equalizing plates 4 cover the front half in the upper and lower directions, and the second flow equalizing plates 5 cover the rear half in the upper and lower directions). The rear side of the first flow equalizing plates 4 and the front side of the second flow equalizing plates 5 are alternately arranged from top to bottom in the middle of the lower mold cavity 104 to form a second gap 106 extending along the left and right direction between any adjacent first flow equalizing plates 4 and second flow equalizing plates 5. The second gap 106 is used for allowing the paint to pass through.

[0048] By respectively arranging adjustable pressure regulating plates and flow equalizing plates in the upper mold cavity 103 and the lower mold cavity 104, a multi-stage flow channel is formed, which effectively improves the flow uniformity of the coating. At the same time, by adjusting the width of the first gap 105, the glue flow rate can be accurately controlled, which can meet the needs of large-size and high-uniformity glue coating, and has a simple structure, low manufacturing cost, and low maintenance difficulty.

[0049] The length of the glue coating slit 102 (i.e., the size in the left-right direction) can be adjusted according to actual needs. Generally, the length of the glue coating slit 102 can be set to be greater than 1000 mm, but is not limited thereto. For example, when used to coat a substrate of a G6 generation flat panel display of 1500 mm*1500 mm, the length of the first gap 105 is not less than 1500 mm.

[0050] The lengths of the first gap 105 and the second gap 106 are both equal to the length of the glue coating slit 102 , so as to further improve the uniformity of the output flow rate at each location of the glue coating slit 102 .

[0051] Among them, the number of each voltage regulating plate, the number of each current equalizing plate, the upper and lower intervals between each first voltage regulating plate 2, the upper and lower intervals between each second voltage regulating plate 3, the upper and lower intervals between each first current equalizing plate 4, and the upper and lower intervals between each second current equalizing plate 5 can be adjusted according to actual needs.

[0052] In some preferred embodiments, see Figure 1 The first pressure regulating plate 2 and the second pressure regulating plate 3 are both inclined, the rear side of the first pressure regulating plate 2 is higher than the front side, and the front side of the second pressure regulating plate 3 is higher than the rear side.

[0053] By setting the first pressure regulating plate 2 and the second pressure regulating plate 3 in an inclined state, the flow path of the coating in the upper mold cavity 103 can be changed. This staggered inclined setting can promote the coating to form a serpentine flow path in the upper mold cavity 103, increase the flow distance and mixing degree of the coating, and form multiple inclined first storage cavities F1. After the coating enters each first storage cavity F1, it first fills the first storage cavity F1 and then overflows from the first gap 105, which can ensure that the coating flows out evenly in the entire left and right direction, further improving the uniformity of coating (effectively preventing the coating from flowing quickly directly from the feed port 101 to the first gap 105, avoiding the problem of uneven distribution of the coating).

[0054] The inclination angles of the first pressure regulating plate 2 and the second pressure regulating plate 3 can be adjusted according to actual needs. For example, the inclination angle (the angle with the horizontal plane) can be set between 15° and 30°, but not limited thereto.

[0055] In some preferred embodiments, see Figure 1 The first current balancing plate 4 and the second current balancing plate 5 are both arranged obliquely, the rear side of the first current balancing plate 4 is higher than the front side, and the front side of the second current balancing plate 5 is higher than the rear side.

[0056] By setting the first flow equalizing plate 4 and the second flow equalizing plate 5 in an inclined state, the flow path of the coating in the lower mold cavity 104 can be changed. This staggered inclined setting can promote the coating to form a serpentine flow path in the lower mold cavity 104, further increase the flow distance and mixing degree of the coating, and form multiple inclined second storage cavities F2. After the coating enters each second storage cavity F2, it first fills the second storage cavity F2 and then overflows from the second gap 106. On the one hand, it can ensure that the coating flows out evenly in the entire left and right directions, further improving the uniformity of coating (effectively preventing the coating from flowing quickly directly from the upper mold cavity 103 to the second gap 106, avoiding the problem of uneven distribution of the coating), and on the other hand, it can separate the bubbles that may exist in the coating during the flow process to prevent the bubbles from affecting the uniformity of the coating process.

[0057] The inclination angles of the first current equalizing plate 4 and the second current equalizing plate 5 can be adjusted according to actual needs. For example, the inclination angle (the angle with the horizontal plane) can be set between 15° and 30°, but not limited thereto.

[0058] Preferably, see Figure 4 The front side of the first pressure regulating plate 2 and the rear side of the second pressure regulating plate 3 are both rotatably connected to the cavity wall of the upper mold cavity 103; an adjustment mechanism 6 is also provided on the mold head body 1, and the adjustment mechanism 6 is used to adjust the inclination angle of the first pressure regulating plate 2 and the second pressure regulating plate 3 so as to adjust the width of the first gap 105.

[0059] The front and rear sides of the first pressure regulating plate 2 and the second pressure regulating plate 3 are rotatably connected to the cavity wall of the upper mold cavity 103, respectively, so that they can rotate around the connection point. By adjusting the inclination angle of these pressure regulating plates, the width of the first gap 105 formed between them can be changed. This design allows the operator to flexibly adjust the size of the gap through which the coating passes according to needs. By changing the width of the first gap 105, the flow rate and flow velocity of the coating can be accurately controlled, thereby affecting the uniformity and thickness of the coating. This adjustability enables the die head to adapt to coatings of different viscosities and different coating requirements, thereby improving the applicability of the equipment and the controllability of the coating quality.

[0060] The rotational connection between the first pressure regulating plate 2 and the second pressure regulating plate 3 can be realized in a variety of ways. For example, a rotating shaft can be set on the front side or the rear side of the pressure regulating plate, and the rotating shaft forms a rotational fit with the cavity wall of the upper mold cavity 103. Another implementation method is to set a pin on the side of the pressure regulating plate, and the pin is inserted into the hole of the cavity wall of the upper mold cavity 103 to form a rotational connection. These connection methods can ensure that the pressure regulating plate can rotate around a fixed point, so as to adjust its tilt angle.

[0061] The design of the adjustment mechanism 6 can also have multiple variations. One possible implementation is to use a screw adjustment mechanism, which includes a screw connected to the pressure regulating plate and a nut fixed to the die body 1. By rotating the screw, the inclination angle of the pressure regulating plate can be accurately controlled. Another way is to use a hydraulic or pneumatic adjustment mechanism to adjust the position of the pressure regulating plate by controlling the hydraulic or pneumatic pressure. This method can achieve faster adjustment and is suitable for scenarios that require frequent adjustments.

[0062] In some possible implementations, see Figure 4 The adjusting mechanism 6 includes two adjusting shafts 601, two motors 602, a plurality of first bevel gears 603 and a plurality of second bevel gears 604. One end of the rotating shaft of each first pressure regulating plate 2 and each second pressure regulating plate 3 extends out of the upper mold cavity 103 and is connected with the first bevel gear 603. A plurality of second bevel gears 604 are arranged on each adjusting shaft 601. The second bevel gears 604 on one adjusting shaft 601 are meshed with the first bevel gears 603 corresponding to each first pressure regulating plate 2 in a one-to-one manner. The second bevel gears 604 on the other adjusting shaft 601 are meshed with the first bevel gears 603 corresponding to each second pressure regulating plate 3 in a one-to-one manner. The two motors 602 are respectively used to drive the two adjusting shafts 601 to rotate.

[0063] The motor 602 is used to adjust the rotation angle of the two adjustment shafts 601, thereby adjusting the rotation angle of each first bevel gear 603, and adjusting the tilt angle of each pressure regulating plate. Moreover, all first pressure regulating plates 2 are uniformly adjusted in angle by the same motor 602, and all second pressure regulating plates 3 are uniformly adjusted in angle by another motor 602, which ensures the synchronization of the rotation angle adjustment of each first pressure regulating plate 2 and the synchronization of the rotation angle adjustment of each second pressure regulating plate 3, and can ensure the consistency of the width of each first gap 105, so that there is a corresponding relationship between the flow rate of the coating flowing out of the upper mold cavity 103 and the rotation angle of the motor 602, which is conducive to simplifying the control logic of the die head flow.

[0064] Preferably, the motor 602 is connected to the corresponding adjustment shaft 601 via a reducer 605; thereby, the adjustment accuracy of the inclination angle of the pressure regulating plate can be improved.

[0065] Further, see Figure 3 The front edge of the first pressure regulating plate 2 and the rear edge of the second pressure regulating plate 3 are both covered with a liquid-proof sealing film 7 .

[0066] Since the front side of the first pressure regulating plate 2 and the rear side of the second pressure regulating plate 3 are rotatably connected to the cavity wall of the upper mold cavity 103, there will be a certain gap between the front side of the first pressure regulating plate 2 and the rear side of the second pressure regulating plate 3 and the cavity wall of the upper mold cavity 103, and the coating will flow down from the gap, thereby affecting the uniformity of the coating thickness. Here, by coating the front side edge of the first pressure regulating plate 2 and the rear side edge of the second pressure regulating plate 3 with a leak-proof sealing film 7, the small gap between the front side edge of the first pressure regulating plate 2 and the cavity wall of the upper mold cavity 103, and the small gap between the rear side edge of the second pressure regulating plate 3 and the cavity wall of the upper mold cavity 103 can be filled. In this way, a better sealing effect can be formed to prevent the coating from flowing down from these positions. At the same time, the material of the leak-proof sealing film 7 has a certain flexibility, which can adapt to the slight deformation when the angle of the pressure regulating plate is adjusted, maintain good sealing performance, and thus ensure the uniformity and stability of the glue coating process. Compared with the traditional rigid sealing method, the use of flexible film sealing can ensure the sealing effect while not affecting the adjustment function of the pressure regulating plate, which reflects the ingenuity of the design.

[0067] The liquid-leakage-proof sealing film 7 can be made of a variety of materials and structures. For example, a film made of an elastomeric material such as silicone rubber, fluororubber, etc. can be used, and these materials have good elasticity and chemical stability. The thickness of the liquid-leakage-proof sealing film 7 can be adjusted according to actual needs (for example, selected within the range of 0.1-1 mm) to ensure sufficient flexibility and sealing effect. The liquid-leakage-proof sealing film 7 can be fixed to the edge of the pressure regulating plate by coating, pasting or buckling.

[0068] Furthermore, the left and rear edges of the first pressure regulating plate 2 and the second pressure regulating plate 3 can be covered with a liquid-proof sealing film 7 to close the gap between the left and right sides of the pressure regulating plate and the inner wall of the upper mold cavity 103 to prevent the paint from flowing downward from these positions, thereby further improving the uniformity and stability of the gluing process.

[0069] In some preferred embodiments, the first flow equalizing plate 4 and the second flow equalizing plate 5 are fixedly connected to the cavity wall of the lower mold cavity 104, all edges of the first flow equalizing plate 4 except the rear edge are in contact with the cavity wall of the lower mold cavity 104, and all edges of the second flow equalizing plate 5 except the front edge are in contact with the cavity wall of the lower mold cavity 104.

[0070] As a result, there is no gap between all edges of the first flow equalizing plate 4 except the rear edge and the cavity wall of the lower mold cavity 104, and there is no gap between all edges of the second flow equalizing plate 5 except the front edge and the cavity wall of the lower mold cavity 104. The paint can only flow through the second gap 106, ensuring that the output flow of the paint at all locations of the glue coating slit 102 is uniform, thereby improving the coating uniformity.

[0071] Among them, the fixed connection between the first current equalizing plate 4 and the second current equalizing plate 5 and the cavity wall of the lower mold cavity 104 can be achieved by welding, bolt connection or slot fixing, and the first current equalizing plate 4 and the second current equalizing plate 5 can also be integrally formed with the cavity wall of the lower mold cavity 104.

[0072] Preferably, see Figure 1 , Figure 2 The die body 1 includes an upper cover plate 8, an upper cavity shell 9 and a lower cavity shell 10; the upper cover plate 8 is connected to the top of the upper cavity shell 9 through a flange, and forms an upper mold cavity 103 with the upper cavity shell 9, and a feed port 101 is arranged on the upper cover plate 8, and the bottom of the upper cavity shell 9 is an open structure; the lower cavity shell 10 forms a lower mold cavity 104, and is connected to the bottom of the upper cavity shell 9 through a flange, and the top of the lower cavity shell 10 is an open structure (so that the lower part of the upper mold cavity 103 is connected with the entire upper part of the lower mold cavity 104), and a glue coating slit 102 is opened at the bottom of the lower cavity shell 10.

[0073] By dividing the die body 1 into three main parts, namely the upper cover plate 8, the upper cavity shell 9 and the lower cavity shell 10, and assembling them together by flange connection, a high uniformity glue coating die with simple structure, easy disassembly and maintenance is formed. The upper cover plate 8 and the upper cavity shell 9 form an upper mold cavity 103, and the lower cavity shell 10 forms a lower mold cavity 104. This design allows the upper and lower mold cavities to be independently formed, which is convenient for processing and assembly. The feed port 101 is set on the upper cover plate 8 to facilitate the input of the paint. The open structure design at the bottom of the upper cavity shell 9 and the top of the lower cavity shell 10 allows the upper and lower mold cavities to be connected, and also facilitates the installation and adjustment of the internal structure. The glue coating slit 102 is opened at the bottom of the lower cavity shell 10 to ensure that the paint can be output evenly.

[0074] Among them, the upper cover plate 8, the upper cavity shell 9 and the lower cavity shell 10 can be made of stainless steel, aluminum alloy and other materials (but not limited thereto), which have high corrosion resistance and strength, and their wall thickness can be adjusted according to actual needs.

[0075] Preferably, sealing grooves may be provided at the flange connections between the upper cover plate 8 and the upper cavity shell 9 and at the flange connections between the upper cavity shell 9 and the lower cavity shell 10, and sealing rings 11 may be provided in the sealing grooves to prevent paint from leaking from these locations.

[0076] Furthermore, an electronic liquid leakage alarm 12 may be provided on the outer surface of the upper cavity shell 9 and / or the lower cavity shell 10; the electronic liquid leakage alarm 12 located on the outer surface of the upper cavity shell 9 is used to detect whether there is paint leakage between the upper cover plate 8 and the upper cavity shell 9, and the electronic liquid leakage alarm 12 located on the outer surface of the lower cavity shell 10 is used to detect whether there is paint leakage between the upper cavity shell 9 and the lower cavity shell 10. Thus, the paint leakage can be discovered in time through the electronic liquid leakage alarm 12, so that the user can perform maintenance in time.

[0077] Among them, the electronic liquid leakage alarm 12 is a prior art and will not be described in detail here.

[0078] In some embodiments, fine-tuning mechanisms are provided on both sides of the upper end of the upper cavity shell 9, and the fine-tuning mechanisms are used to connect with the glue coating machine and adjust the horizontality of the high uniformity glue coating die head in the left and right directions.

[0079] The fine-tuning mechanism is arranged on the left and right sides of the upper end of the upper cavity shell 9, and can realize the precise adjustment of the horizontality of the high uniformity glue coating die head in the left and right directions. This design has two main functions: it is used to connect with the glue coating machine to ensure that the die head can be firmly installed on the glue coating machine; it can adjust the horizontality of the die head in the left and right directions to ensure the uniformity of glue coating. By arranging the fine-tuning mechanism on the left and right sides of the upper cavity shell 9, the operator can easily adjust the horizontality of the die head. This design enables the die head to adapt to different coating conditions and requirements, and improves the coating quality and efficiency.

[0080] The fine-tuning mechanism can be implemented in a variety of ways. In one embodiment, the fine-tuning mechanism includes a fixing seat 901, an adjusting bolt and a locking nut. The fixing seat 901 is fixedly connected to the upper cavity shell 9, and the adjusting bolt passes through the adjusting hole on the fixing seat 901 to connect with the glue coating machine. The horizontality of the die head can be accurately controlled by adjusting the screw-in depth of the bolt, and it is fixed by the locking nut after the adjustment is completed. In another embodiment, the fine-tuning mechanism includes two piezoelectric ceramic adjustment blocks respectively connected to the left and right sides of the upper end of the upper cavity shell 9 and the glue coating machine. The height adjustment of the left and right sides of the die head is achieved by adjusting the voltage at both ends of the piezoelectric ceramic adjustment block, thereby achieving the adjustment of the horizontality of the left and right directions of the die head. This method has high adjustment accuracy and is conducive to automatic adjustment.

[0081] It should be noted that the bottom of the lower cavity housing 10 is provided with a protruding portion 1001 protruding downward and extending in the left-right direction (such as Figure 6As shown in the figure, the width of the raised portion 1001 (i.e., the dimension in the front-to-back direction) gradually decreases from top to bottom, and the glue coating slit 102 runs through the upper and lower ends of the raised portion 1001, thereby forming a coating lip at the outlet of the glue coating slit 102 (i.e., the bottom surface of the raised portion 1001 where the outlet of the glue coating slit 102 is located), wherein the portion of the coating lip located in front of the outlet of the glue coating slit 102 is called the front lip, and the portion located in the rear of the outlet of the glue coating slit 102 is called the rear lip.

[0082] refer to Figure 5 The present application provides a flow control method for controlling the high uniformity coating die head mentioned above, comprising the steps of:

[0083] A1. Calculate the preferred dynamic pressure of the glue coating slit 102 and the preferred distance between the coating lip of the glue coating slit 102 and the coated substrate 90 according to the target coating thickness and the preset coating speed;

[0084] A2. Adjust the height of the high uniformity coating die head so that the distance between the coating lip of the coating slit 102 and the coated substrate 90 is the preferred distance;

[0085] A3. The width of the first gap 105 is adjusted according to the preferred dynamic pressure of the glue slit 102;

[0086] A4. After adjusting the distance between the coating lip of the coating slit 102 and the coated substrate and the width of the first gap 105, the coated substrate 90 is coated at a preset coating speed.

[0087] The flow control method achieves precise control of the gluing process through precise calculation and multiple adjustments. It first determines the optimal parameters through theoretical calculation, then achieves these parameters by adjusting the die height and the width of the first gap 105, and finally performs coating under stable conditions. This method not only takes into account the coating thickness and speed, but also the dynamic pressure of the gluing slit 102, so that the gluing process can be more comprehensively controlled and the uniformity and accuracy of coating can be improved.

[0088] The preset coating speed is the moving speed of the high uniformity coating die head; it can be set according to actual needs, for example, the preferred coating speed can be determined in advance through experiments and set as the preset coating speed.

[0089] The target coating thickness is the required thickness of the coating applied on the coated substrate 90 .

[0090] Specifically, in step A1, the preferred dynamic pressure of the glue coating slit 102 and the preferred distance between the coating lip of the glue coating slit 102 and the coated substrate can be solved according to the following formula:

[0091] (1);

[0092] (2);

[0093] (3);

[0094] (4);

[0095] (5);

[0096] (6);

[0097] in, is the output flow rate of the glue-coated slit 102, is the width of the glue coating slit 102, is the depth of the glue-coating slit 102, is the preferred dynamic pressure of the glue-coating slit 102, is the dynamic pressure at the middle of the gap between the coating lip of the coating slit 102 and the coated substrate 90, is the dynamic viscosity constant of the coating, To preset the coating speed, is the target coating thickness, is the flow rate of the coating material flowing out from the front lip opening (i.e., the outlet of the front lip) of the coating slit 102, is the preferred distance between the front lip of the coating slit 102 and the coated substrate 90, is the dynamic pressure at the front lip of the glue-coating slit 102, is the width of the front lip of the glue slit 102 (the dimension in the front-to-back direction), is the air pressure at the front lip of the glue coating slit 102 (generally one atmosphere), is the flow rate of the coating material flowing out from the rear lip opening (i.e., the outlet of the rear lip) of the coating slit 102, is the preferred distance between the rear lip of the coating lip of the coating slit 102 and the coated substrate 90, is the dynamic pressure at the rear lip of the glue-coating slit 102, is the width of the rear lip of the glue slit 102, is the air pressure at the rear lip of the glue coating slit 102 (generally one atmosphere), It is the height difference between the front lip and the rear lip of the glue coating slit 102 (generally 0, but not limited to this).

[0098] refer to Figure 6 According to the theory of fluid mechanics, the output flow rate of the glue-coated slit 102 satisfies:

[0099] (7);

[0100] in, is the dynamic pressure of the glue coating slit 102 (ie, the dynamic pressure at the top entrance of the glue coating slit 102).

[0101] In fact, during a stable coating process, the flow rate at the front lip is It should be 0, otherwise the stability of the droplet position at the front lip cannot be guaranteed, resulting in uneven coating thickness. At this time, all the coating output from the glue coating slit 102 flows out from the rear lip (such as Figure 6 As shown), formula (7) can be converted to:

[0102] (8);

[0103] In addition, according to the theory of fluid mechanics, the following formula can be obtained:

[0104] (9);

[0105] (10);

[0106] in, is the distance between the front lip of the coating slit 102 and the coated substrate 90, It is the distance between the rear lip of the coating lip of the glue coating slit 102 and the coated substrate 90.

[0107] Among them, the height difference between the front lip and the rear lip is a fixed value, so:

[0108] (11);

[0109] For the equations (8)-(11) , and That is, the preferred dynamic pressure of the glue coating slit 102, the preferred distance between the front lip and the coated substrate 90, and the preferred distance between the rear lip and the coated substrate 90, which are respectively recorded as , and , after substituting into formulas (8)-(11), we can obtain formulas (1), (2), (4), and (6).

[0110] After adjusting the distance between the coating lip of the coating slit 102 and the coated substrate and the width of the first gap 105 based on the preferred distance and preferred dynamic pressure calculated by formulas (1)-(6), when the die head moves at a preset coating speed to coat the coated substrate 90, it can be ensured that the coating thickness is equal to the target coating thickness.

[0111] Among them, the corresponding relationship between the inclination angle of the first pressure regulating plate 2 and the second pressure regulating plate 3 and the dynamic pressure of the glue-coated slit 102 can be obtained in advance through experiments, and a query table can be formed or a corresponding conversion model can be obtained by fitting. Therefore, in step A3, the preferred inclination angles of the first pressure regulating plate 2 and the second pressure regulating plate 3 are obtained by looking up the table according to the preferred dynamic pressure of the glue-coated slit 102 or converted according to the conversion model, and then the inclination angles of the first pressure regulating plate 2 and the second pressure regulating plate 3 are adjusted to the corresponding preferred inclination angles to complete the width adjustment of the first gap 105.

[0112] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0113] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high uniformity glue coating die, comprising a die body (1), wherein a feed port (101) is arranged at the top of the die body (1), and a glue coating slit (102) extending in the left-right direction is arranged at the bottom of the die body (1); characterized in that: The die body (1) has an upper die cavity (103) and a lower die cavity (104) arranged in sequence up and down and connected to each other, the feed port (101) is connected to the top of the upper die cavity (103), and the glue coating slit (102) is connected to the bottom of the lower die cavity (104); A plurality of first pressure regulating plates (2) arranged at intervals in the upper and lower directions and a plurality of second pressure regulating plates (3) arranged at intervals in the upper and lower directions are arranged in the upper mold cavity (103); the first pressure regulating plates (2) and the second pressure regulating plates (3) respectively cover the front half and the rear half of the upper mold cavity (103); the rear side of the first pressure regulating plates (2) and the front side of the second pressure regulating plates (3) are arranged alternately from top to bottom in the middle of the upper mold cavity (103) to form a first gap (105) extending in the left-right direction between any adjacent first pressure regulating plates (2) and second pressure regulating plates (3); the first gap (105) is used for allowing the coating to pass through and the width of the first gap (105) is adjustable; the first pressure regulating plates (2) and the second pressure regulating plates (3) are both arranged obliquely; the rear side of the first pressure regulating plate (2) is higher than the front side, and the front side of the second pressure regulating plate (3) is higher than the rear side; The lower mold cavity (104) is provided with a plurality of first flow equalizing plates (4) arranged at intervals in an upper and lower direction and a plurality of second flow equalizing plates (5) arranged at intervals in an upper and lower direction, the first flow equalizing plates (4) and the second flow equalizing plates (5) respectively cover the front half and the rear half of the lower mold cavity (104), the rear side of the first flow equalizing plates (4) and the front side of the second flow equalizing plates (5) are arranged alternately from top to bottom in the middle of the lower mold cavity (104), so as to form a second gap (106) extending in the left-right direction between any adjacent first flow equalizing plates (4) and second flow equalizing plates (5), the second gap (106) being used for allowing the coating to pass through; the first flow equalizing plates (4) and the second flow equalizing plates (5) are both arranged obliquely, the rear side of the first flow equalizing plates (4) is higher than the front side, and the front side of the second flow equalizing plates (5) is higher than the rear side.

2. The high uniformity coating die head according to claim 1, characterized in that: The front side of the first pressure regulating plate (2) and the rear side of the second pressure regulating plate (3) are both rotatably connected to the cavity wall of the upper mold cavity (103); an adjustment mechanism (6) is also provided on the die head body (1), and the adjustment mechanism (6) is used to adjust the inclination angle of the first pressure regulating plate (2) and the second pressure regulating plate (3) so as to adjust the width of the first gap (105).

3. The high uniformity coating die head according to claim 2, characterized in that: The front edge of the first pressure regulating plate (2) and the rear edge of the second pressure regulating plate (3) are both covered with a liquid-leakage-proof sealing film (7).

4. The high uniformity coating die head according to claim 1, characterized in that: The first flow equalizing plate (4) and the second flow equalizing plate (5) are both fixedly connected to the cavity wall of the lower mold cavity (104); all edges of the first flow equalizing plate (4) except the rear edge are in contact with the cavity wall of the lower mold cavity (104); and all edges of the second flow equalizing plate (5) except the front edge are in contact with the cavity wall of the lower mold cavity (104).

5. The high uniformity coating die head according to any one of claims 1 to 4, characterized in that: The die head body (1) comprises an upper cover plate (8), an upper cavity shell (9) and a lower cavity shell (10); the upper cover plate (8) is connected to the top of the upper cavity shell (9) via a flange, and together with the upper cavity shell (9) forms the upper die cavity (103); the feed port (101) is arranged on the upper cover plate (8), and the bottom of the upper cavity shell (9) is an open structure; the lower cavity shell (10) forms the lower die cavity (104), and is connected to the bottom of the upper cavity shell (9) via a flange, the top of the lower cavity shell (10) is an open structure, and the glue coating slit (102) is opened at the bottom of the lower cavity shell (10).

6. The high uniformity coating die head according to claim 5, characterized in that: Fine-adjustment mechanisms are provided on both left and right sides of the upper end of the upper cavity shell (9), and the fine-adjustment mechanisms are used to connect with a glue coating machine and adjust the horizontality of the high uniformity glue coating die head in the left and right directions.

7. A flow control method, characterized in that: Used to control the high uniformity coating die head according to any one of claims 1 to 6, comprising the steps of: A1. Calculating the preferred dynamic pressure of the glue coating slit (102) and the preferred distance between the coating lip of the glue coating slit (102) and the coated substrate (90) according to the target coating thickness and the preset coating speed; A2. adjusting the height of the high uniformity coating die head so that the distance between the coating lip of the coating slit (102) and the coated substrate (90) is the preferred distance; A3. adjusting the width of the first gap (105) according to the preferred dynamic pressure of the glue coating slit (102); A4. After adjusting the distance between the coating lip of the coating slit (102) and the coated substrate (90) and the width of the first gap (105), coating the coated substrate (90) at the preset coating speed.

8. The flow control method according to claim 7, characterized in that: In step A1, the preferred dynamic pressure of the glue coating slit (102) and the preferred distance between the coating lip of the glue coating slit (102) and the coated substrate (90) are solved according to the following formula: ； ； ； ； ； ； in, is the output flow rate of the glue coating slit (102), is the width of the glue coating slit (102), is the depth of the glue coating slit (102), is the preferred dynamic pressure of the glue coating slit (102), is the dynamic pressure at the middle of the gap between the coating lip of the coating slit (102) and the coated substrate (90), is the dynamic viscosity constant of the coating, is the preset coating speed, is the target coating thickness, is the flow rate of the coating material flowing out from the front lip of the coating lip of the coating slit (102), is the preferred distance between the front lip of the coating lip of the coating slit (102) and the coated substrate (90), is the dynamic pressure at the front lip of the glue coating slit (102), is the width of the front lip of the glue coating slit (102), is the air pressure at the front lip of the glue coating slit (102), is the flow rate of the coating material flowing out from the rear lip of the coating lip of the coating slit (102), is the preferred distance between the rear lip of the coating lip of the coating slit (102) and the coated substrate (90), is the dynamic pressure at the rear lip of the coating lip of the coating slit (102), is the width of the rear lip of the glue coating slit (102), is the air pressure at the rear lip of the glue coating slit (102), It is the height difference between the front lip and the rear lip of the glue coating slit (102).

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