Composite coating die head for optical film production

Abstract

The invention belongs to the technical field of coating equipment, and particularly relates to a composite coating die head for optical film production, the composite coating die head comprises a front die holder, one end of the front die holder is fixedly provided with a rear die holder, and the front die holder is sequentially provided with a first liquid storage cavity, a second liquid storage cavity and a plurality of liquid inlets from the upper end to the lower end; the second liquid storage cavity is communicated with the multiple liquid inlets, and after the front die base and the rear die base are tightly attached, the first liquid storage cavity, the second liquid storage cavity and the liquid inlets form a medium conveying channel. When the base material is coated, a coating can be formed on the surface of the base material after the base material adhered with slurry passes through the lip slit, the thickness of the coating can be adjusted by adjusting the gap between the coating lip and the surface of the base material, the coating precision is improved, meanwhile, the surface of the base material is coated through the lip slit, and the coating quality is improved. The method can effectively prevent the shearing effect from damaging the orientation of a macromolecular chain, and the edge is not easy to generate thickness error.

Description

Technical Field

[0001] This invention belongs to the field of coating equipment technology, and specifically relates to a composite coating die head for optical film production. Background Technology

[0002] As a core material in fields such as display and optoelectronics, optical films require the coating of multiple functional coatings (such as PVA iodine polarizing layer, PSA pressure-sensitive adhesive, anti-glare layer, etc.) on the surface of substrates such as PET and TAC during their production process. The thickness accuracy, interface cleanliness, and polymer chain structure integrity of these coatings directly determine the optical performance and application effect of the optical film. The composite coating die head is a key piece of equipment for achieving high-precision multilayer coating, and its performance has a decisive impact on coating quality and production efficiency.

[0003] Existing traditional coating methods are difficult to meet the high requirements of optical films. Comma coating uses an open slurry supply, which easily leads to solvent evaporation and foreign matter contamination, and thickness errors are prone to occur at the edges, affecting coating stability. Slit coating can destroy the orientation of polymer chains due to high shear force, and also has the problem of edge thickness deviation. Traditional roller coating has problems such as poor thickness uniformity (significant edge thickening), low material utilization (only 70-80%), and high defect rate (3-5%). None of them can simultaneously meet the requirements of high thickness accuracy (single layer wet thickness ≤5μm, uniformity ±1.5%), high interface cleanliness (no miscibility, no bubbles) and low shear force to protect the polymer chain structure.

[0004] Given the shortcomings of traditional coating methods in terms of precision, stability, and material utilization, which make them unsuitable for the stringent standards of optical film production, this application proposes a composite coating die for optical film production to improve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a composite coating die for optical film production. When coating a substrate, the substrate with the slurry adhering to it can form a coating on the substrate surface after passing through the lip slit. By adjusting the gap between the coating lip and the substrate surface, the coating thickness can be adjusted, thus improving the coating accuracy. At the same time, coating the substrate surface through the lip slit can effectively avoid the shearing action from damaging the polymer chain orientation, and the edges are less prone to thickness errors.

[0006] The specific technical solution adopted by this invention is as follows: A composite coating die head for optical film production includes a front die base, one end of which is fixed to a rear die base. The front die base has a first liquid storage cavity, a second liquid storage cavity, and multiple liquid inlets sequentially formed from top to bottom. The second liquid storage cavity and the multiple liquid inlets are interconnected. When the front die base and the rear die base are tightly fitted together, the first liquid storage cavity, the second liquid storage cavity, and the liquid inlets form a medium conveying channel. A rear die insert is detachably fixed to the upper end of the rear die base. A coating lip is formed at the upper end of the rear die insert. Edge blocks are detachably mounted on both sides of the front die base and the rear die insert, located inside the first liquid storage cavity. The edge blocks are configured to adjust the width of the coating on the substrate surface.

[0007] In a preferred embodiment, the width of the substrate surface coating and the width of the edge stop are negatively correlated; when the width of the edge stop increases, the width of the substrate surface coating decreases; when the width of the edge stop decreases, the width of the substrate surface coating increases.

[0008] In a preferred embodiment, an adjustment plate is inclinedly fixed to the upper end of the front mold base, and the adjustment plate is configured to limit the edge stop in the vertical direction.

[0009] In a preferred embodiment, during operation, the gap between the adjustment plate and the substrate surface ranges from 0.7 mm to 1.7 mm.

[0010] In a preferred embodiment, both ends of the front mold base are fixed with mold head blocks, and the mold head blocks are fixedly connected to the rear mold base. A pad is also assembled between the front mold base and the mold head blocks. The pad is configured to block both sides of the first liquid storage chamber and both sides of the second liquid storage chamber.

[0011] In a preferred embodiment, the rear mold base is equipped with multiple fine-tuning mechanisms at the end away from the front mold base. The fine-tuning mechanism includes a first slider, a second slider, a retaining plate, an adjusting nut, and a rear mold adjusting bolt. The first slider and the second slider are both slidably connected to the end of the rear mold base away from the front mold base, and the first slider is located at the upper end of the second slider. The retaining plate is fixed to the lower end of the second slider. The adjusting nut is engaged inside the retaining plate. The rear mold adjusting bolt is threadedly connected inside the adjusting nut, and the first slider and the rear mold adjusting bolt are threadedly connected.

[0012] In a preferred embodiment, the outer side of the rear mold adjusting bolt is provided with two external thread sections, and the threads of the two external thread sections are opposite in direction. The first slider and the rear mold adjusting bolt, as well as the adjusting nut and the rear mold adjusting bolt, are respectively connected by the two external thread sections.

[0013] In a preferred embodiment, a Z-shaped cover plate is detachably fixed to the upper end of the first slider, and the first slider, the Z-shaped cover plate, the rear mold adjusting bolt, and the Z-shaped cover plate are all mutually compatible.

[0014] In a preferred embodiment, a plurality of base plates are uniformly fixed at the end of the front mold base away from the rear mold base. The base plates have T-shaped slots inside, and front mold adjusting bolts are rotatably engaged inside the T-shaped slots. The front mold adjusting bolts are threadedly connected to the adjusting plates.

[0015] In a preferred embodiment, the upper end of the adjusting plate is detachably fixed with a lip protective shell, and the lip protective shell is compatible with the rear mold insert.

[0016] The technical effects achieved by this invention are as follows: In this invention, when coating a substrate, a lip slit is formed between the coating lip and the substrate surface. The substrate with the slurry adhered to it passes through the lip slit and a coating is formed on the substrate surface. By adjusting the gap between the coating lip and the substrate surface, the coating thickness can be adjusted, improving the coating accuracy. At the same time, coating the substrate surface through the lip slit can effectively avoid the shearing action from damaging the orientation of the polymer chains, and the edges are less prone to thickness errors. When it is necessary to adjust the coating width, the present invention can adjust the coating width on the substrate surface by disassembling the adjustment plate and replacing the edge blocks of different lengths. The disassembly and assembly process of the adjustment plate is simple and convenient. This invention provides an adjustment plate at the upper end of the front mold base, maintaining a small gap between the adjustment plate and the substrate surface. This small gap effectively prevents the slurry inside the first liquid storage chamber from evaporating and also blocks foreign objects from entering the slurry, thus preventing them from affecting the stability of the coating. This effectively improves the cleanliness of the coating section and ensures the optical performance of the optical film. This invention adjusts the thickness of the local coating by rotating the rear mold adjusting bolt and adjusting the position of the lateral fine-tuning mechanism. This allows the first slider and the adjusting nut to shift towards or away from each other, thereby eliminating the thick edge phenomenon of the coating and making the single-layer coating thickness more uniform. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the structure of the front mold base of the present invention; Figure 4 This is an enlarged structural schematic diagram of a portion of the front mold base of the present invention; Figure 5 This is an exploded view of the internal structure of the front mold base of the present invention; Figure 6 This is a schematic diagram of the structure of the rear mold base of the present invention; Figure 7 This is an enlarged structural diagram of a portion of the rear mold base of the present invention; Figure 8 This is an exploded view of the internal structure of the rear mold base of the present invention; Figure 9 This is a schematic diagram of the structure of the rear mold insert of the present invention; Figure 10 This is a schematic diagram of the fine-tuning mechanism of the present invention; Figure 11 This is a cross-sectional view of the fine-tuning mechanism of the present invention; Figure 12 This is an exploded view of the structure of the fine-tuning mechanism of this invention; Figure 13 This is a schematic diagram of the structure of the base plate of the present invention; Figure 14 This is a schematic diagram of the working state of the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 10. Front mold base; 11. First liquid storage chamber; 12. Second liquid storage chamber; 13. Liquid inlet; 14. Adjusting plate; 15. Mold head block; 16. Pad plate; 17. Base plate; 18. T-shaped slot; 19. Front mold adjusting bolt; 20. Rear mold base; 21. Rear mold insert; 22. Coating lip; 23. Lip protective shell; 30. Edge stop; 40. Fine-tuning mechanism; 41. First slider; 42. Second slider; 43. Clamping plate; 44. Adjusting nut; 45. Rear mold adjusting bolt; 46. Z-shaped cover plate. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0022] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include the three-dimensional spatial dimensions of length, width, and depth.

[0023] Please see the appendix Figures 1 to 9 As shown, this is the first embodiment of the present invention. This embodiment provides a composite coating die head for optical film production, including a front die base 10. A rear die base 20 is fixed to one end of the front die base 10. The front die base 10 has a first liquid storage cavity 11, a second liquid storage cavity 12, and a plurality of liquid inlets 13 sequentially formed from the upper end to the lower end. The second liquid storage cavity 12 and the plurality of liquid inlets 13 are interconnected. After the front die base 10 and the rear die base 20 are tightly fitted together, the first liquid storage cavity 11, the second liquid storage cavity 12, and the liquid inlets 13 form a medium conveying channel. The rear die base 20... A rear mold insert 21 is detachably fixed at the upper end. A coating lip 22 is provided at the upper end of the rear mold insert 21. Edge blocks 30 are detachably mounted on both sides between the front mold base 10 and the rear mold insert 21 and inside the first liquid storage cavity 11. The edge blocks 30 are configured to adjust the width of the coating on the substrate surface. The width of the coating on the substrate surface and the width of the edge blocks 30 are negatively correlated. When the width of the edge blocks 30 increases, the width of the coating on the substrate surface decreases; when the width of the edge blocks 30 decreases, the width of the coating on the substrate surface increases.

[0024] Furthermore, a machine base is used in conjunction with this device. The rear mold base 20 is detachably fixed to the machine base. The machine base integrates a feeding module, and a feeding roller is rotatably connected inside the feeding module. The feeding roller can feed the substrate. In the working state, the feeding roller is located at the upper end of the first liquid storage chamber 11, and the feeding roller is adapted to the coating lip 22. The gap between the coating lip 22 and the substrate surface is the coating thickness of the slurry on the substrate surface (i.e., the coating thickness). The machine base, the front mold base 10, and the rear mold base 20 are all existing mature applications. In this embodiment, the relevant parts and working principles of the machine base, the front mold base 10, and the rear mold base 20 that are not explicitly defined are all based on the existing technology, and will not be further described here.

[0025] It should be noted that when the device coats the substrate, a lip slit is formed between the coating lip 22 and the substrate. The substrate with the slurry adhering to it is coated when it passes through the lip slit. In the initial state, the coating lip 22 is parallel to the horizontal plane.

[0026] Here, a pressure sensor (not shown in the figure) is installed inside the liquid inlet 13. The pressure sensor can detect the liquid level of the slurry inside the medium conveying channel. Specifically, when the liquid level of the slurry inside the medium conveying channel decreases, the pressure value monitored by the pressure sensor decreases; when the liquid level of the slurry inside the medium conveying channel increases, the pressure value monitored by the pressure sensor increases. The slurry conveying flow rate is adjusted according to the monitoring value of the pressure sensor, thereby controlling the supply and demand balance of the slurry. The working principle of obtaining the liquid level by detecting the pressure change by the pressure sensor is a mature existing application. Its specific operation can be referred to the existing technology, and will not be elaborated further here.

[0027] In this embodiment, when coating the substrate surface, the substrate is fed by a feeding module, forming a lip slit between the coating lip 22 and the substrate. Slurry is injected into the media conveying channel through the liquid inlet 13. The slurry flows along the media conveying channel into the first liquid storage chamber 11. When the substrate moves to the upper end of the first liquid storage chamber 11, it comes into contact with the slurry, adhering to the substrate surface. The substrate moves synchronously with the slurry adhering to its surface. After the slurry adhering to the substrate surface contacts the coating lip 22, the gap between the coating lip 22 and the substrate surface is the thickness of the coating. Excess slurry is scraped off by the coating lip 22. In addition, the thickness of the coating on the substrate surface can be precisely controlled. At the same time, coating the substrate through the lip slit can effectively avoid the shearing action from damaging the polymer chain orientation, and the edges are less prone to thickness errors. When it is necessary to adjust the coating width, the edge stop 30 is replaced so that the distance between the two edge stop 30s is equal to the coating width, so that a coating of the preset width can be coated on the substrate surface. When the width of the edge stop 30 increases, the distance between the two edge stop 30s decreases, and the width of the coating on the substrate surface decreases; when the width of the edge stop 30 decreases, the distance between the two edge stop 30s increases, and the width of the coating on the substrate surface increases.

[0028] It should be noted that in the field of substrate coating, the surface tension of the slurry is a key physical characteristic for achieving precise contact between the substrate and the slurry. Due to the cohesive force between slurry molecules and the interfacial tension balance formed with the air interface, the free liquid surface will naturally present a convex shape with a specific curvature. The height and shape of this convex shape need to be optimized by adjusting the surface tension of the slurry (which can be achieved by adding surfactants, adjusting the solid content of the slurry, or adjusting the temperature) in combination with the coating process requirements (such as the target coating thickness and the substrate running speed) to ensure that the substrate approaches and precisely contacts the highest point of the slurry liquid surface in a stable posture under the drive of the coating device. When the substrate flows through the upper end of the first liquid storage chamber 11, after the substrate contacts the highest point of the liquid surface, it is continuously and stably supplied by the transfer amount to keep the highest point of the liquid surface stable. The control of the transfer amount is related to the substrate feeding speed, slurry viscosity, and other factors. The specific control method of the transfer amount can refer to the existing technology, which will not be elaborated further here.

[0029] In one specific embodiment, since the rear mold insert 21 is detachably fixed to the upper end of the rear mold base 20, when coating the substrate, the rear mold insert 21 can be replaced with a lip coating insert according to the coating requirements. Through the above solution, the device can conveniently replace the rear mold insert 21 according to the coating requirements.

[0030] Secondly, please refer to the following as well. Figure 2 and Figure 3 An adjustment plate 14 is detachably fixed to the upper end of the front mold base 10, and the adjustment plate 14 is in an inclined state. The adjustment plate 14 is configured to limit the edge stop 30 in the vertical direction. In the working state, the gap between the adjustment plate 14 and the substrate surface is 0.7mm to 1.7mm.

[0031] It should be noted that during the coating process on the substrate surface, the adjusting plate 14 does not come into contact with the substrate surface.

[0032] In this embodiment, when the edge stop 30 needs to be replaced according to the substrate coating requirements, the adjusting plate 14 is disassembled to release the limiting effect of the adjusting plate 14 on the edge stop 30. The edge stop 30 is then removed, and an edge stop 30 of suitable length is inserted. The adjusting plate 14 is then fixed back to the upper end of the front mold base 10, so that the adjusting plate 14 limits the replaced edge stop 30. This allows for convenient and efficient adjustment of the coating width. At the same time, the adjusting plate 14 does not contact the substrate, and the gap is controlled within the range of 0.7mm to 1.7mm. This ensures that during the coating process, the adjusting plate 14 effectively prevents foreign objects from entering the first liquid storage chamber 11 and contaminating the slurry inside the first liquid storage chamber 11, thus affecting the stability of the coating. Furthermore, this design effectively reduces the volatilization of the slurry inside the first liquid storage chamber 11.

[0033] It should be noted that when replacing the edge stop 30, it is necessary to ensure that there is no slurry inside the medium conveying channel.

[0034] Please refer to it again. Figures 3 to 5 Both ends of the front mold base 10 are fixed with mold head blocks 15 by bolts, and the mold head blocks 15 and the rear mold base 20 are fixedly connected by bolts. A pad 16 is also assembled between the front mold base 10 and the mold head blocks 15. The pad 16 is configured to block both sides of the first liquid storage chamber 11 and both sides of the second liquid storage chamber 12.

[0035] In this embodiment, the two ends of the first liquid storage chamber 11 and the second liquid storage chamber 12 are sealed by the cooperation of the die block 15 and the pad plate 16 to prevent the slurry inside the cut-off conveying channel from flowing out.

[0036] Please refer to it again. Figure 8 and Figures 10 to 12 The rear mold base 20 is equipped with multiple fine-tuning mechanisms 40 at the end away from the front mold base 10. The fine-tuning mechanism 40 is configured to fine-tune the thickness of the coating on the substrate surface to ensure a consistent coating thickness. The fine-tuning mechanism 40 includes a first slider 41, a second slider 42, a retaining plate 43, an adjusting nut 44, and a rear mold adjusting bolt 45. The first slider 41 and the second slider 42 are slidably connected to the end of the rear mold base 20 away from the front mold base 10, and the first slider 41 is located at the upper end of the second slider 42. The retaining plate 43 is fixed to the lower end of the second slider 42. The adjusting nut 44 is engaged inside the retaining plate 43. The rear mold adjusting bolt 45 is threadedly connected inside the adjusting nut 44. The first slider 41 and the rear mold adjusting bolt 45 are threadedly connected. The outer side of the rear mold adjusting bolt 45 has two external thread sections with opposite thread directions. The first slider 41 and the rear mold adjusting bolt 45, as well as the adjusting nut 44 and the rear mold adjusting bolt 45, are threadedly connected through the two external thread sections.

[0037] It should be noted that the rear mold base 20 has two T-shaped guide grooves at the end away from the front mold base 10, and the two T-shaped guide grooves are respectively adapted to the first slider 41 and the second slider 42.

[0038] Furthermore, both the first slider 41 and the second slider 42 have bolt holes inside, and the internal threads of the bolt holes are connected to limit bolts. When the limit bolts and the rear mold base 20 are tightly fitted, the limit bolts can limit the first slider 41 or the second slider 42. In the initial state, the two limit bolts limit the first slider 41 and the second slider 42 respectively.

[0039] Here, when the rear mold adjusting bolt 45 is rotated in the forward direction, the first slider 41 and the adjusting nut 44 are offset in a direction away from each other; when the rear mold adjusting bolt 45 is rotated in the reverse direction, the first slider 41 and the adjusting nut 44 are offset in a direction closer to each other. Of course, the forward and reverse rotations are only to distinguish the rotation direction of the rear mold adjusting bolt 45 and do not constitute a specific limitation.

[0040] In this embodiment, when it is necessary to make local fine-tuning of the coating thickness on the substrate surface, the limiting bolts that limit the first slider 41 and the second slider 42 are released. The first slider 41 and the second slider 42 are moved in the opposite direction along the extension of the front mold base 10. After moving to the target position, the limiting bolts are rotated to limit the first slider 41 and the second slider 42 again. The rear mold adjusting bolt 45 is rotated. Since the rear mold adjusting bolt 45 and the adjusting nut 44, as well as the rear mold adjusting bolt 45 and the first slider 41 are all threaded connections, and the two external thread sections on the outer side of the rear mold adjusting bolt 45 have opposite thread directions, the first slider 41 and the adjusting nut 44 are offset in the direction of moving closer to each other / away from each other. This allows for fine-tuning of the local coating thickness. Specifically, when the rear mold adjusting bolt 45 is rotated in the forward direction, the first slider 41 and the adjusting nut 44 are offset in the direction of moving away from each other, and the local coating thickness on the substrate surface decreases. When the rear mold adjusting bolt 45 is rotated in the reverse direction, the first slider 41 and the adjusting nut 44 are offset in the direction of moving closer to each other, and the local coating thickness on the substrate surface increases.

[0041] It should be noted that, in this embodiment, the offset between the first slider 41 and the adjusting nut 44 refers to a slight relative twist between the first slider 41 and the adjusting nut 44, which can be understood as a microscopic deformation.

[0042] Please refer to it again. Figure 2 , Figure 6 as well as Figure 8 The upper end of the first slider 41 is detachably fixed with a Z-shaped cover plate 46, and the first slider 41, the Z-shaped cover plate 46, the rear mold adjusting bolt 45, and the Z-shaped cover plate 46 are all compatible with each other.

[0043] In this embodiment, the Z-shaped cover plate 46 can shield the fine-tuning mechanism 40, preventing foreign objects or slurry from adhering to the surface of the fine-tuning mechanism 40.

[0044] Please refer to it again. Figure 3 and Figure 13 Multiple base plates 17 are evenly fixed at one end of the front mold base 10 away from the rear mold base 20. A T-shaped slot 18 is provided inside the base plate 17. The front mold adjusting bolt 19 is rotatably engaged inside the T-shaped slot 18, and the front mold adjusting bolt 19 is threadedly connected to the adjusting plate 14.

[0045] Furthermore, a clearance hole is provided inside the base plate 17, which is compatible with the front mold adjusting bolt 19. A screwdriver or wrench can be passed through the clearance hole to rotate the front mold adjusting bolt 19.

[0046] In this embodiment, since the front mold adjusting bolt 19 and the adjusting plate 14 are threadedly connected, after rotating the front mold adjusting bolt 19, the front mold adjusting bolt 19 is engaged inside the T-shaped slot 18, which allows the front mold adjusting bolt 19 to drive the adjusting plate 14 to shift, thereby adjusting the tension angle of the slurry surface between the first liquid storage chamber 11 and the substrate.

[0047] Please refer to it again. Figure 3 and Figure 13 The upper end of the adjusting plate 14 is detachably fixed with a lip protective shell 23, and the lip protective shell 23 is compatible with the rear mold insert 21.

[0048] It should be noted that the lip protective shell 23 should be removed first when applying the coating.

[0049] In this embodiment, after the coating of the substrate surface is completed, the lip protective shell 23 is installed on the upper end of the adjustment plate 14. The lip protective shell 23 can cover the rear mold insert 21 and the coating lip 22, protect the coating lip 22, and at the same time, prevent foreign objects from entering the first liquid storage cavity 11 and affecting the stability of subsequent coating.

[0050] The working principle of this invention is as follows: Please see Figure 14 As shown, the substrate is fed by the feeding module, and the slurry is injected into the medium conveying channel through the liquid inlet 13. The slurry flows along the medium conveying channel into the first liquid storage chamber 11. When the substrate moves to the upper end of the first liquid storage chamber 11, it comes into contact with the slurry. The slurry adheres to the surface of the substrate and moves synchronously. After the slurry adhering to the substrate surface comes into contact with the coating lip 22, the excess slurry is scraped off by the coating lip 22, thereby precisely controlling the thickness of the coating on the substrate surface. When it is necessary to adjust the coating width, the adjusting plate 14 is removed, and the edge stop 30 is adjusted. The distance between the two edge blocks 30 is made equal to the coating width, so that a coating of a preset width can be applied to the substrate surface. When it is necessary to make local adjustments to the coating thickness (denoted as region A), the fine-tuning mechanism 40 closest to region A is moved so that region A and the fine-tuning mechanism 40 correspond. The rear mold adjusting bolt 45 in the fine-tuning mechanism 40 is rotated so that the first slider 41 and the adjusting nut 44 in the fine-tuning mechanism 40 move closer to each other, thereby achieving the purpose of local adjustment of the coating thickness.

[0051] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A composite coating die for optical film production, characterized in that: The device includes a front mold base (10), one end of which is fixed with a rear mold base (20). The front mold base (10) is provided with a first liquid storage cavity (11), a second liquid storage cavity (12), and a liquid inlet (13) from the top to the bottom. The second liquid storage cavity (12) and the liquid inlet (13) are interconnected. When the front mold base (10) and the rear mold base (20) are tightly fitted together, the first liquid storage cavity (11), the second liquid storage cavity (12), and the liquid inlet (13) form a medium conveying channel. The upper end of the rear mold base (20) is detachably fixed with a rear mold insert (21). The upper end of the rear mold insert (21) is provided with a coating lip (22). Edge blocks (30) are detachably mounted on both sides of the front mold base (10) and the rear mold insert (21) inside the first liquid storage cavity (11). The edge blocks (30) are configured to adjust the width of the coating on the substrate surface.

2. The composite coating die for optical film production according to claim 1, characterized in that: The width of the substrate surface coating is negatively correlated with the width of the edge block (30). When the width of the edge block (30) increases, the width of the substrate surface coating decreases; when the width of the edge block (30) decreases, the width of the substrate surface coating increases.

3. The composite coating die for optical film production according to claim 1, characterized in that: An adjustment plate (14) is fixed at the upper end of the front mold base (10) at an inclination. The adjustment plate (14) is configured to limit the edge stop (30) in the vertical direction.

4. The composite coating die for optical film production according to claim 3, characterized in that: When in operation, the gap between the adjustment plate (14) and the substrate surface is in the range of 0.7mm to 1.7mm.

5. A composite coating die for optical film production according to claim 1, characterized in that: Both ends of the front mold base (10) are fixed with mold head blocks (15), and the mold head blocks (15) and the rear mold base (20) are fixedly connected. A pad (16) is also assembled between the front mold base (10) and the mold head blocks (15). The pad (16) is configured to block both sides of the first liquid storage chamber (11) and both sides of the second liquid storage chamber (12).

6. The composite coating die for optical film production according to claim 1, characterized in that: The rear mold base (20) is equipped with a plurality of fine adjustment mechanisms (40) at the end away from the front mold base (10). The fine adjustment mechanism (40) includes a first slider (41), a second slider (42), a retaining plate (43), an adjusting nut (44), and a rear mold adjusting bolt (45). The first slider (41) and the second slider (42) are slidably connected to the end of the rear mold base (20) away from the front mold base (10), and the first slider (41) is located at the upper end of the second slider (42). The retaining plate (43) is fixed to the lower end of the second slider (42). The adjusting nut (44) is engaged inside the retaining plate (43). The rear mold adjusting bolt (45) is threadedly connected inside the adjusting nut (44), and the first slider (41) and the rear mold adjusting bolt (45) are threadedly connected.

7. A composite coating die for optical film production according to claim 6, characterized in that: The rear mold adjusting bolt (45) has two external thread sections on its outer side, and the threads of the two external thread sections are opposite in direction. The first slider (41) and the rear mold adjusting bolt (45), as well as the adjusting nut (44) and the rear mold adjusting bolt (45), are respectively connected by the two external thread sections.

8. A composite coating die for optical film production according to claim 6, characterized in that: The upper end of the first slider (41) is detachably fixed with a Z-shaped cover plate (46), and the first slider (41) and the Z-shaped cover plate (46), as well as the rear mold adjusting bolt (45) and the Z-shaped cover plate (46), are all compatible with each other.

9. A composite coating die for optical film production according to claim 3, characterized in that: Multiple base plates (17) are evenly fixed at one end of the front mold base (10) away from the rear mold base (20). A T-shaped slot (18) is provided inside the base plate (17). A front mold adjusting bolt (19) is rotatably engaged inside the T-shaped slot (18), and the front mold adjusting bolt (19) and the adjusting plate (14) are threadedly connected.

10. A composite coating die for optical film production according to claim 3, characterized in that: The upper end of the adjustment plate (14) is detachably fixed with a lip protective shell (23), and the lip protective shell (23) is compatible with the rear mold insert (21).

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