Mixing method for manufacturing PET anti-glare screen

Abstract

This invention discloses a mixing device and method for manufacturing PET anti-glare screens. The mixing device includes a mixing device body and a grinding and mixing structure. The mixing device body includes a shell, and a top cover plate is detachably installed on the top of the shell. The grinding and mixing structure includes a multi-level gradient grinding assembly, which includes an upper grinding disc, a middle grinding disc, and a lower grinding disc. This invention integrates the traditional step-by-step process into a continuous process through an integrated grinding and mixing design, greatly shortening the process cycle and improving mixing efficiency. By grinding and mixing the raw materials through the multi-level grinding assembly, the uniformity of nanoparticle dispersion is greatly improved, eliminating microstructural roughness caused by uneven mixing at the source, improving the scattering effect of reflected light, and enhancing the dispersion ability of nano-sized noble metal particles, preventing their agglomeration, resulting in a low coating brightness coefficient and stable polarization ratio.

Description

Technical Field

[0001] This invention belongs to the field of optical material processing technology, and specifically relates to a hybrid method for manufacturing PET anti-glare screens. Background Technology

[0002] A PET anti-glare screen is a screen product that reduces screen glare using specific technology. It is mainly composed of polyethylene terephthalate (PET) film, silver paste, and an anti-glare coating. During manufacturing, the silver paste is applied to the front end of the PET film, and the anti-glare coating is applied to the front end of the silver paste. This structure effectively reduces the reflection and scattering of light sources by the screen, thereby mitigating the impact of glare on viewers. The mixing effect of the raw materials directly affects the quality of the finished screen during the manufacturing process of a PET anti-glare screen.

[0003] In the production of PET anti-glare screens, the preparation of the anti-glare coating requires the uniform mixing of nano / micron-sized functional particles (such as SiO2 and TiO2) with the resin matrix. Traditional mixing processes require step-by-step grinding and mixing, leading to extended production cycles, low production efficiency, high energy consumption, and material loss and energy waste due to equipment switching. Existing mixing devices lack sufficient dispersion capability for nano-sized precious metal particles, which tend to agglomerate, resulting in low coating brightness coefficients and unstable polarization ratios. Uneven distribution of the precious metal ion layer reduces the screen's scattering angle and contrast. Furthermore, insufficient grinding and mixing of raw materials leads to inconsistent surface microstructure roughness, resulting in poor reflected light scattering effects.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a mixing method for manufacturing PET anti-glare screens, which can solve the problems of long production cycles and low efficiency caused by the step-by-step grinding and mixing process in traditional methods, as well as the problems of agglomeration caused by uneven mixing of raw materials, resulting in low coating brightness coefficient, unstable polarization ratio and poor reflected light scattering effect.

[0006] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0007] A mixing apparatus for manufacturing a PET anti-glare screen, comprising:

[0008] The mixing device body includes a housing, the top of which is detachably fitted with a top cover.

[0009] The grinding and mixing structure includes a multi-stage gradient grinding assembly to achieve different stages of grinding of materials, improving the grinding effect and efficiency. The multi-stage gradient grinding assembly includes an upper grinding disc, a middle grinding disc, and a lower grinding disc. These three discs achieve different stages of grinding, realizing a three-stage grinding process of "coarse crushing - medium grinding - fine grinding" through gradient crushing, solving the problem of low efficiency with a single grinding disc. The upper, middle, and lower grinding discs are rotatably connected within the housing in a top-to-bottom arrangement, allowing materials to be ground sequentially through them. The upper grinding disc has multiple integrally formed sawtooth mechanisms. When the upper grinding disc drives these sawtooth mechanisms to rotate at high speed, the sharp edges of the sawtooth mechanisms apply shearing and impact forces to larger particles or agglomerates in the raw material, breaking them into millimeter or sub-millimeter particles. The intermediate grinding disc has multiple honeycomb grooves, each containing a magnetic grinding ball. Driven by the high-speed rotation of the intermediate grinding disc, the magnetic grinding balls vortex along the honeycomb grooves, subjecting the particles to high-frequency collisions and crushing for intermediate grinding. The upper surface of the lower grinding disc is laser-etched with a grating structure. When particles flow across the grating surface, they are subjected to shearing forces from the nanoscale grooves, further refining them to submicron or nanometer scale. Simultaneously, the directional arrangement of the grating guides the slurry to form a laminar flow, reducing particle agglomeration caused by turbulence and ensuring uniform grinding. A grinding ring is detachably installed on the inner wall of the housing. A precise gap is formed between the grinding ring and the rotating upper, intermediate, and lower grinding discs. When the slurry flows through this gap, the rotation of the dynamic grinding disc and the fixed position of the static ring together generate shearing and compressive forces, crushing the particles to the target particle size. A rotating assembly is installed inside the housing to drive the rotation of the upper, intermediate, and lower grinding discs.

[0010] In one or more embodiments of the present invention, a feeding assembly and an air inlet pipe are installed on the upper cover plate. The feeding assembly is used to transport materials into the housing, and the air inlet pipe is used to connect to an inert gas pipe to provide protective gas into the housing, ensuring that the material is not affected by oxidation during grinding, thus ensuring the stability of the resin. Simultaneously, a vacuum pump interface is added to the top of the upper cover plate to eliminate air bubbles in the slurry, reduce pinhole defects in the coating, and improve the mixing uniformity of high-solids slurry by drawing a vacuum into the housing. A guide plate is fixedly connected to the bottom of the housing below the feeding assembly. The material input from the lower grinding disc is ground after being guided by the guide plate. Multiple discharge ports are evenly spaced on the bottom wall of the housing, each equipped with a screen. A discharge funnel is fixedly connected to the outer side of the bottom wall of the housing, located below the multiple discharge ports. After grinding in the housing, the material is sieved by the screen and then discharged through the discharge funnel.

[0011] In one or more embodiments of the present invention, a first annular groove is formed on the upper surface of the upper grinding disc at an edge position. The width of the first annular groove is set to 5-8 mm, and the depth is set to 3-5 mm. A plurality of first grinding beads are disposed in the first annular groove. The particle size of the first grinding beads is set to 1-2 mm. The diameter of the honeycomb groove is set to 1 mm, the depth of the honeycomb groove is set to 2 mm, and the particle size of the magnetic grinding ball is set to 0.2 mm. The size settings of the first annular groove and the first grinding beads, as well as the honeycomb groove and the magnetic grinding ball, are configured to fix the radial position of the first grinding beads and the magnetic grinding ball, preventing the grinding beads from scattering due to centrifugal force during high-speed rotation.

[0012] In one or more embodiments of the present invention, the period and depth of the grating structure are 300nm and 100nm, respectively. The directional arrangement of the grating guides the slurry to form laminar flow, reduces particle agglomeration caused by turbulence, and ensures uniform grinding. The upper surface of the lower grinding disc is provided with a second annular groove at the edge. The width of the second annular groove is set to 0.8~1.5mm and the depth is set to 0.5~1mm. A plurality of second grinding beads are provided in the second annular groove. The particle size of the second grinding beads is set to 0.1~0.3mm.

[0013] In one or more embodiments of the present invention, both the first and second grinding beads are configured with a core-shell structure, wherein the shell of the core-shell structure is a repair layer, and the core of the core-shell structure is a zirconia bead, which is made of polyurethane material. The polyurethane material allows the outer shell of the first and second grinding beads to release a repair agent to fill micro-cracks in the groove wall after wear, reducing maintenance frequency.

[0014] In one or more embodiments of the present invention, a spiral guide groove is formed on the inner wall of the grinding ring. The cross-section of the spiral guide groove is semi-circular, and the rotation direction of the spiral guide groove is opposite to the rotation direction of the multi-gradient grinding assembly. The rotation direction of the spiral guide groove and the opposite movement of the multi-gradient grinding assembly generate a reverse shear force, forcing the slurry to form an "upward-downward" circulating flow in the upper, middle, and lower grinding disc regions, effectively preventing the material from flowing directly downward. When the upper, middle, and lower grinding discs rotate at high speed, the material is thrown towards the edge of the cavity by centrifugal force so as to approach the static grinding ring and enter the spiral guide groove. The spiral guide groove guides some of the material downward, but due to the reverse shear force, most of the material is lifted back to the top of the grinding disc, forming a cycle. The distance between the upper grinding disc and the grinding ring is set to 3~3.5mm, the distance between the middle grinding disc and the grinding ring is set to 1~1.5mm, and the distance between the lower grinding disc and the grinding ring is set to 0.2~0.3mm. The gradient setting of the gap between the grinding disc and the second annular groove allows for a layered transition. When material enters from the upper layer, the sudden narrowing of the gap forces it back into the high-shear region, preventing particles from circling around and ensuring thorough grinding and crushing at each layer. Multiple ultrasonic transducers are evenly spaced on the inner wall of the conical end at the bottom of the housing. These transducers further disperse the ground material, preventing agglomeration.

[0015] In one or more embodiments of the present invention, a first flow-blocking ring is fixedly connected to the inner wall of the grinding ring below the upper grinding disc. This first flow-blocking ring restricts the downward movement of unground material from the upper grinding disc. The first flow-blocking ring has multiple first guide holes spaced at equal intervals in a through-and-through manner, allowing material to enter the lower layer only through these holes, preventing insufficiently ground material from falling directly. These first guide holes are Venturi-shaped, utilizing the Venturi effect to accelerate slurry passage and enhance shear mixing. The inlet diameter of the first guide hole is 5 mm, the throat diameter is 2 mm, and the outlet diameter is 4 mm. The outlet of the first guide hole is inclined towards the center of the first flow-blocking ring to guide the material ground by the upper grinding disc onto the middle grinding disc for further grinding. A second flow-blocking ring is fixedly connected to the inner wall of the grinding ring below the middle grinding disc. This second flow-blocking ring restricts the downward movement of unground material from the middle grinding disc. The second flow-blocking ring has multiple second flow-guiding holes spaced at equal intervals in a vertically penetrating manner. The diameter of the multiple second flow-guiding holes is set to 2.5mm. The material ground by the middle grinding disc is transported to the lower grinding disc for further grinding through the second flow-guiding holes.

[0016] In one or more embodiments of the present invention, a drive shaft is rotatably connected through the upper cover plate. The lower end of the drive shaft is rotatably connected to the bottom wall plate of the housing, and a high-speed motor is mounted on the upper end of the drive shaft. The high-speed motor drives the drive shaft to rotate at high speed. A first planetary gear transmission mechanism is mounted at the center of the upper grinding disc, a second planetary gear transmission mechanism is mounted at the center of the middle grinding disc, and a third planetary gear transmission mechanism is mounted at the center of the lower grinding disc. The first, second, and third planetary gear transmission mechanisms are respectively mounted on the drive shaft. The rotation of the drive shaft drives the first, second, and third planetary gear transmission mechanisms, thereby driving the upper, middle, and lower grinding discs to rotate. The transmission ratio of the first planetary gear transmission mechanism is 1:3, the transmission ratio of the second planetary gear transmission mechanism is 1:2, and the transmission ratio of the third planetary gear transmission mechanism is 1:1.5. Since the upper, middle, and lower grinding discs rotate at different speeds during use, the speed is controlled by setting different transmission ratios for the first, second, and third planetary gear transmission mechanisms in order to drive the upper, middle, and lower grinding discs to rotate at different speeds via the drive shaft.

[0017] A mixing method for manufacturing a PET anti-glare screen, the mixing method comprising:

[0018] S1. Premix nano / micro-sized functional particles with resin matrix to form initial slurry;

[0019] S2. The initial mixed slurry is pumped into the housing through the feeding assembly. The initial mixed slurry falls onto the upper grinding disc. When the upper grinding disc drives the saw tooth mechanism to rotate at high speed, the sharp edges of the saw tooth mechanism apply shearing and impact forces to the larger particles or agglomerates in the slurry, breaking them into millimeter or sub-millimeter particles.

[0020] S3. The slurry particles after being ground and crushed by the upper grinding disc flow through the gap between the upper grinding disc and the grinding ring, and fall onto the middle grinding disc after being screened by multiple first guide holes on the first flow-blocking ring. This allows the slurry particles to be ground by magnetic grinding balls in the honeycomb groove. Under the high-speed rotation of the middle grinding disc, the magnetic grinding balls form a vortex motion along the honeycomb groove, which performs high-frequency collision and crushing on the particles to further reduce the size of the slurry particles.

[0021] S4. The slurry particles after being ground and crushed by the middle grinding disc flow through the gap between the middle grinding disc and the grinding ring, and fall onto the lower grinding disc after being screened by multiple second guide holes on the second flow-blocking ring. When the slurry particles flow through the surface of the grating structure, they are subjected to the shearing force of the nano-scale grooves, further refining the slurry particles to the submicron or nano-scale.

[0022] S5. Under the high-speed rotation of the upper, middle and lower grinding discs, the slurry particles on the grinding discs are thrown onto the side wall of the grinding ring under the action of centrifugal force. The material will be guided to flow through the spiral guide groove. Due to the reverse movement of the spiral guide groove and the grinding disc, a reverse shearing force is generated, which forces the slurry to form an upward and downward circulation flow in the upper, middle and lower grinding disc areas, ensuring that the material needs to go through multiple cycles to pass through the single-layer grinding area.

[0023] In one or more embodiments of the present invention, the gap between the upper grinding disc and the grinding ring is set to 2.5~3.5mm, and the rotation speed of the upper grinding disc is 500~1000rpm; the gap between the middle grinding disc and the grinding ring is 0.8~1.5mm, and the rotation speed of the middle grinding disc is 1500~2000rpm; the gap between the lower grinding disc and the grinding ring is 0.1~0.3mm, and the rotation speed of the lower grinding disc is 2500~3000rpm.

[0024] Compared with existing technologies, this invention integrates traditional step-by-step processes into continuous processing through an integrated grinding and mixing design, which greatly shortens the process cycle and improves mixing efficiency. By grinding and mixing the raw materials through multi-gradient grinding components, the dispersion uniformity of nanoparticles is greatly improved, eliminating the microstructure roughness caused by uneven mixing at the source, improving the scattering effect of reflected light, and enhancing the dispersion ability of nano-sized noble metal particles, preventing their agglomeration, resulting in a low coating brightness coefficient and stable polarization ratio. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front view of a mixing apparatus for manufacturing a PET anti-glare screen according to an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional view of a mixing apparatus for manufacturing a PET anti-glare screen according to an embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of a mixing apparatus for manufacturing a PET anti-glare screen according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the multi-level gradient grinding component in this invention;

[0030] Figure 5 For the present invention Figure 3 A schematic diagram at point A in the middle;

[0031] Figure 6 For the present invention Figure 3 A schematic diagram at point B in the middle;

[0032] Figure 7 For the present invention Figure 3 A schematic diagram at point C in the middle;

[0033] Figure 8 For the present invention Figure 3 A schematic diagram at point D in the middle;

[0034] Figure 9 For the present invention Figure 3 A schematic diagram at point E in the middle.

[0035] Explanation of key figure labels:

[0036] 1-Mixing device body, 11-Shell, 12-Upper cover plate, 13-Feeding assembly, 14-Guide plate, 15-Air inlet pipe, 16-Discharge port, 17-Screen, 18-Discharge funnel, 2-Grinding and mixing structure, 21-Upper grinding disc, 22-Middle grinding disc, 23-Lower grinding disc, 24-Grinding ring, 25-First planetary gear transmission mechanism, 26-Second planetary gear transmission mechanism, 27-Third planetary gear transmission mechanism, 28-Sawtooth mechanism, 29-The 210-First grinding bead, 211-Honeycomb groove, 212-Magnetic grinding bead, 213-Grating structure, 214-Second annular groove, 215-Second grinding bead, 216-Oxide beads, 217-Repair layer, 218-Spiral guide groove, 219-First flow-blocking ring, 220-First flow-guiding hole, 221-Second flow-blocking ring, 222-Second flow-guiding hole, 223-Ultrasonic transducer, 224-Drive shaft, 225-High-speed motor. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0038] like Figures 1-3 As shown, a mixing device for manufacturing a PET anti-glare screen according to one embodiment of the present invention includes a mixing device body 1 and a grinding and mixing structure 2.

[0039] like Figures 1-3As shown, the mixing device body 1 includes a housing 11, and a top cover 12 is detachably mounted on the top of the housing 11. The easy disassembly and assembly of the top cover 12 facilitates maintenance of the components inside the housing 11.

[0040] like Figures 1-3 As shown, the upper cover plate 12 is equipped with a feeding assembly 13 and an air inlet pipe 15. The feeding assembly 13 is used to transport materials into the housing 11, and the air inlet pipe 15 is used to connect to an inert gas pipe to provide protective gas into the housing 11, ensuring that the material is not affected by oxidation during grinding, thus maintaining the stability of the resin. Simultaneously, a vacuum pump interface is added to the top of the upper cover plate 12. By drawing a vacuum into the housing 11, air bubbles in the slurry are eliminated, reducing pinhole defects in the coating and improving the mixing uniformity of high-solids slurry. A guide plate 14 is fixedly connected to the bottom of the housing 11, below the feeding assembly 13. The material input to the lower grinding disc 23 is ground after being guided by the guide plate 14. Multiple discharge ports 16 are provided at equal intervals on the bottom wall of the housing 11. Each discharge port 16 is equipped with a screen 17. A discharge funnel 18 is fixedly connected to the outside of the bottom wall of the housing 11. The discharge funnel 18 is located below the multiple discharge ports 16. After the material is ground inside the housing 11, it is screened by the screen 17 and then discharged through the discharge funnel 18.

[0041] like Figures 1-4As shown, the grinding and mixing structure 2 includes a multi-stage gradient grinding assembly to achieve grinding of materials at different stages, improving the grinding effect and efficiency. The multi-stage gradient grinding assembly includes an upper grinding disc 21, a middle grinding disc 22, and a lower grinding disc 23. Grinding of materials at different stages is achieved through these three discs, realizing a three-stage grinding process of "coarse crushing - medium grinding - fine grinding" through gradient crushing, solving the problem of low efficiency with a single grinding disc. The upper grinding disc 21, middle grinding disc 22, and lower grinding disc 23 are rotatably connected within the housing 11 in a top-to-bottom arrangement, allowing materials to be ground sequentially through them. Multiple sawtooth mechanisms 28 are integrally formed on the upper grinding disc 21. When the upper grinding disc 21 drives the multiple sawtooth mechanisms 28 to rotate at high speed, the sharp edges of the sawtooth mechanisms 28 apply shearing and impact forces to larger particles or agglomerates in the raw material, breaking them into millimeter-sized or sub-millimeter-sized particles. Multiple honeycomb grooves 211 are formed on the middle grinding disc 22, and magnetic grinding balls 212 are arranged in each of the multiple honeycomb grooves 211. Driven by the high-speed rotation of the middle grinding disc 22, the magnetic grinding balls 212 form a vortex motion along the honeycomb grooves 211, and perform high-frequency collision and crushing of the particles to achieve medium grinding of the material. The upper surface of the lower grinding disc 23 is laser-etched with a grating structure 213. When the particles flow through the grating surface, they are subjected to the shearing force of the nanoscale grooves, which further refines them to the submicron or nanoscale. At the same time, the directional arrangement of the grating guides the slurry to form a laminar flow, reducing particle agglomeration caused by turbulence and ensuring uniform grinding. A grinding ring 24 is detachably installed on the inner wall of the housing 11. A precision gap is formed between the grinding ring 24 and the rotating upper grinding disc 21, middle grinding disc 22 and lower grinding disc 23. When the slurry flows through this gap, the rotation of the dynamic grinding disc and the fixed position of the static ring together generate shearing force and extrusion force, which crushes the particles to the target particle size. A rotating assembly is installed inside the housing 11. The rotating assembly is used to drive the upper grinding disc 21, the middle grinding disc 22 and the lower grinding disc 23 to rotate.

[0042] Optionally, an electromagnetic coil is set between the upper grinding disc 21 and the middle grinding disc 22. The movement trajectory of the magnetic grinding ball 212 is controlled by the alternating magnetic field generated by the external electromagnetic coil, so that it covers every corner of the honeycomb groove 211 and avoids uneven grinding caused by "dead corners".

[0043] like Figure 3 Combination Figure 5As shown, a first annular groove 29 is formed on the upper surface of the upper grinding disc 21 at the edge. The width of the first annular groove 29 is set to 5~8mm, and the depth is set to 3~5mm. A plurality of first grinding beads 210 are arranged in the first annular groove 29. The particle size of the first grinding beads 210 is set to 1~2mm. The diameter of the honeycomb groove 211 is set to 1mm, and the depth of the honeycomb groove 211 is set to 2mm. The particle size of the magnetic grinding ball 212 is set to 0.2mm. The size settings of the first annular groove 29 and the first grinding beads 210, as well as the honeycomb groove 211 and the magnetic grinding ball 212, are set to fix the radial position of the first grinding beads 210 and the magnetic grinding ball 212, and to prevent the grinding beads from flying away due to centrifugal force during high-speed rotation.

[0044] like Figure 2 and Figure 4 As shown, the period and depth of the grating structure 213 are 300nm and 100nm, respectively. The directional arrangement of the grating guides the slurry to form a laminar flow, reducing particle agglomeration caused by turbulence and ensuring uniform grinding. A second annular groove 214 is provided on the upper surface of the lower grinding disc 23 at the edge. The width of the second annular groove 214 is set to 0.8~1.5mm and the depth is set to 0.5~1mm. A plurality of second grinding beads 215 are provided in the second annular groove 214. The particle size of the second grinding beads 215 is set to 0.1~0.3mm.

[0045] Preferably, a first annular groove 29 and a second annular groove 214 are respectively formed at the edges of the upper grinding disc 21 and the lower grinding disc 23, and a first grinding bead 210 and a second grinding bead 215 are arranged in the first annular groove 29 and the second annular groove 214. The geometry of the first annular groove 29 and the second annular groove 214 is matched with the rotation direction of the grinding disc, forcing the first grinding bead 210 and the second grinding bead 215 to form a spiral motion trajectory along the groove, extending their contact path with the material. At the same time, the gap between the grinding disc and the second annular groove 214 forms a narrow channel, and the rolling of the first grinding bead 210 and the second grinding bead 215 and the flow of slurry superimpose shear force, which is particularly suitable for the refinement of nanoscale particles.

[0046] Preferably, both the first grinding bead 210 and the second grinding bead 215 are configured with a core-shell structure. The shell of the core-shell structure is a repair layer 217, and the core of the core-shell structure is a zirconia bead 216 made of polyurethane material. The polyurethane material allows the outer shell of the first grinding bead 210 and the second grinding bead 215 to release a repair agent to fill the micro-cracks in the groove wall after wear, reducing the maintenance frequency.

[0047] like Figure 3As shown, a spiral guide groove 218 is provided on the inner wall of the grinding ring 24. The cross-section of the spiral guide groove 218 is semi-circular, and the rotation direction of the spiral guide groove 218 is opposite to the rotation direction of the multi-gradient grinding assembly. The rotation direction of the spiral guide groove 218 and the opposite movement of the multi-gradient grinding assembly generate a reverse shear force, which forces the slurry to form an "upward-downward" circulating flow in the areas of the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23, effectively preventing the material from flowing directly downward. When the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23 rotate at high speed, the material is thrown towards the edge of the cavity by centrifugal force so that it can approach the static grinding ring and enter the spiral guide groove 218. The spiral guide groove 218 guides some of the material downward, but due to the influence of the reverse shear force, most of the material is lifted back to the top of the grinding disc, forming a circulation. The distance between the upper grinding disc 21 and the grinding ring 24 is set to 3~3.5mm, the distance between the middle grinding disc 22 and the grinding ring 24 is set to 1~1.5mm, and the distance between the lower grinding disc 23 and the grinding ring 24 is set to 0.2~0.3mm. This gradient setting of the gap between the grinding discs and the second annular groove 214 allows for a gradual transition between layers. When material enters from the upper layer, the sudden narrowing of the gap forces it back into the high-shear region, preventing material particles from circling around and ensuring thorough grinding and crushing at each layer. Multiple ultrasonic transducers 223 are evenly spaced on the inner wall of the conical end at the bottom of the housing 11. These transducers further disperse the ground material, preventing agglomeration.

[0048] like Figure 3 Combination Figure 8 and Figure 9As shown, a first flow-blocking ring 219 is fixedly connected to the inner wall of the grinding ring 24 below the upper grinding disc 21. To prevent unground material from leaking directly down the upper grinding disc 21, the first flow-blocking ring 219 restricts the downward movement of the material. The first flow-blocking ring 219 has multiple first guide holes 220 evenly spaced in a through-and-through manner, allowing material to enter the lower layer only through the first guide holes 220, preventing insufficiently ground material from falling directly. The multiple first guide holes 220 are Venturi-shaped, utilizing the Venturi effect to accelerate the passage of slurry and enhance shear mixing. The inlet diameter of the first guide hole 220 is 5mm, the throat diameter is 2mm, and the outlet diameter is 4mm. The outlet of the first guide hole 220 is inclined towards the center of the first flow-blocking ring 219 to guide the material ground by the upper grinding disc 21 onto the middle grinding disc 22 for further grinding. A second flow-blocking ring 221 is fixedly connected to the inner wall of the grinding ring 24 below the intermediate grinding disc 22. The second flow-blocking ring 221 is used to restrict the downward movement of material that has not been ground by the intermediate grinding disc 22. The second flow-blocking ring 221 has multiple second flow-guiding holes 222 at equal intervals in a vertically penetrating manner. The diameter of the multiple second flow-guiding holes 222 is set to 2.5mm. The material ground by the intermediate grinding disc 22 is conveyed through the second flow-guiding holes 222 to the lower grinding disc 23 for further grinding.

[0049] like Figures 2-4 As shown, a drive shaft 224 is rotatably connected to the upper cover plate 12 in a through manner. The lower end of the drive shaft 224 is rotatably connected to the bottom wall plate of the housing 11, and a high-speed motor 225 is installed on the upper end of the drive shaft 224. The high-speed motor 225 drives the drive shaft 224 to rotate at high speed. A first planetary gear transmission mechanism 25 is installed at the center of the upper grinding disc 21, a second planetary gear transmission mechanism 26 is installed at the center of the middle grinding disc 22, and a third planetary gear transmission mechanism 27 is installed at the center of the lower grinding disc 23. The first planetary gear transmission mechanism 25, the second planetary gear transmission mechanism 26, and the third planetary gear transmission mechanism 27 are respectively installed on the drive shaft 224. The rotation of the drive shaft 224 drives the first planetary gear transmission mechanism 25, the second planetary gear transmission mechanism 26, and the third planetary gear transmission mechanism 27, thereby driving the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23 to rotate. The transmission ratio of the first planetary gear transmission mechanism 25 is 1:3, the transmission ratio of the second planetary gear transmission mechanism 26 is 1:2, and the transmission ratio of the third planetary gear transmission mechanism 27 is 1:1.5. Since the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23 rotate at different speeds during use, in order to drive the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23 to rotate at different speeds via the drive shaft 224, the first planetary gear transmission mechanism 25, the second planetary gear transmission mechanism 26, and the third planetary gear transmission mechanism 27 with different transmission ratios are used to control the rotation speed.

[0050] Another embodiment of the present invention provides a mixing method for manufacturing a PET anti-glare screen, the mixing method comprising:

[0051] S1. Premix nano / micro-sized functional particles with resin matrix to form initial slurry;

[0052] S2. The initial mixed slurry is pumped into the housing 11 through the feeding assembly 13. The initial mixed slurry falls onto the upper grinding disc 21. When the upper grinding disc 21 drives the saw tooth mechanism 28 to rotate at high speed, the sharp edge of the saw tooth mechanism 28 applies shearing and impact forces to the larger particles or agglomerates in the slurry, breaking them into millimeter-level or sub-millimeter-level particles.

[0053] S3. The slurry particles after being ground and crushed by the upper grinding disc 21 flow through the gap between the upper grinding disc 21 and the grinding ring 24, and after being screened by multiple first guide holes 220 on the first flow-blocking ring 219, they fall onto the middle grinding disc 22. This allows the slurry particles to be ground by the magnetic grinding balls 212 in the honeycomb groove 211. Under the high-speed rotation of the middle grinding disc 22, the magnetic grinding balls 212 form a vortex motion along the honeycomb groove 211, which performs high-frequency collision and crushing on the particles, so as to further reduce the size of the slurry particles.

[0054] S4. The slurry particles after being ground and crushed by the middle grinding disc 22 flow through the gap between the middle grinding disc 22 and the grinding ring 24, and fall onto the lower grinding disc 23 after being screened by multiple second guide holes 222 on the second flow-blocking ring 221. When the slurry particles flow through the surface of the grating structure 213, they are subjected to the shearing force of the nano-scale grooves, and the slurry particles are further refined to the submicron or nanoscale.

[0055] S5. Under the high-speed rotation of the upper grinding disc 21, the middle grinding disc 22 and the lower grinding disc 23, the slurry particles on the grinding disc are thrown onto the side wall of the grinding ring 24 under the action of centrifugal force. The material will be guided to flow through the spiral guide groove 218. Due to the reverse movement of the spiral guide groove 218 and the grinding disc, a reverse shearing force is generated, which forces the slurry to form an upward and downward circulating flow in the areas of the upper grinding disc 21, the middle grinding disc 22 and the lower grinding disc 23, ensuring that the material needs to go through multiple cycles to pass through the single-layer grinding area.

[0056] In one or more embodiments of the present invention, the gap between the upper grinding disc 21 and the grinding ring 24 is set to 2.5~3.5mm, and the rotation speed of the upper grinding disc 21 is 500~1000rpm; the gap between the middle grinding disc 22 and the grinding ring 24 is 0.8~1.5mm, and the rotation speed of the middle grinding disc 22 is 1500~2000rpm; the gap between the lower grinding disc 23 and the grinding ring 24 is 0.1~0.3mm, and the rotation speed of the lower grinding disc 23 is 2500~3000rpm. Thus, by using the different rotation speeds of the upper grinding disc 21, middle grinding disc 22, and lower grinding disc 23, a three-stage processing of the material—coarse crushing, medium grinding, and fine grinding—is achieved, ensuring that the material is crushed into nanoparticles while being evenly dispersed, avoiding material agglomeration, thereby improving the quality of the prepared screen.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mixing device for manufacturing a PET anti-glare screen, characterized by, include: The mixing device body includes a housing, the top of which is detachably fitted with a top cover. A grinding hybrid structure includes a multi-stage gradient grinding assembly, which comprises an upper grinding disc, a middle grinding disc, and a lower grinding disc. The upper, middle, and lower grinding discs are rotatably connected within a housing in a top-to-bottom arrangement. The upper grinding disc has multiple serrated mechanisms integrally formed on it. The middle grinding disc has multiple honeycomb grooves, each containing a magnetic grinding ball. The upper surface of the lower grinding disc has a grating structure laser-etched on it. A grinding ring is detachably mounted on the inner wall of the housing. A rotating assembly is installed inside the housing to drive the upper, middle, and lower grinding discs to rotate. The upper surface of the upper grinding disc has a first annular groove at the edge. The width of the first annular groove is 5-8 mm and the depth is 3-5 mm. A plurality of first grinding beads are arranged in the first annular groove. The particle size of the first grinding beads is 1-2 mm. The diameter of the honeycomb groove is 1 mm and the depth of the honeycomb groove is 2 mm. The particle size of the magnetic grinding ball is 0.2 mm. The period and depth of the grating structure are 300nm and 100nm, respectively. The upper surface of the lower grinding disc has a second annular groove at the edge. The width of the second annular groove is set to 0.8~1.5mm and the depth is set to 0.5~1mm. A plurality of second grinding beads are arranged in the second annular groove. The particle size of the second grinding beads is set to 0.1~0.3mm.

2. The mixing device for manufacturing a PET anti-glare screen according to claim 1, wherein The upper cover is equipped with a feeding assembly and an air inlet pipe. A guide plate is fixedly connected to the bottom of the housing below the feeding assembly. Multiple discharge ports are opened at equal intervals on the bottom wall of the housing. Screens are installed on each of the discharge ports. A discharge funnel is fixedly connected to the outside of the bottom wall of the housing and is located below the multiple discharge ports.

3. The mixing device for manufacturing a PET anti-glare screen according to claim 1, wherein Both the first and second grinding beads are configured with a core-shell structure. The shell of the core-shell structure is a repair layer, and the core of the core-shell structure is a zirconia bead. The zirconia bead is made of polyurethane material.

4. The mixing device for manufacturing a PET anti-glare screen according to claim 1, wherein The inner wall of the grinding ring is provided with a spiral guide groove. The cross-section of the spiral guide groove is semi-circular. The rotation direction of the spiral guide groove is opposite to the rotation direction of the multi-gradient grinding assembly. The distance between the upper grinding disc and the grinding ring is set to 3~3.5mm, the distance between the middle grinding disc and the grinding ring is set to 1~1.5mm, and the distance between the lower grinding disc and the grinding ring is set to 0.2~0.3mm. Multiple ultrasonic transducers are installed at equal intervals on the inner wall of the conical end at the bottom of the housing.

5. The mixing device for manufacturing a PET anti-glare screen according to claim 4, wherein The inner wall of the grinding ring is fixedly connected to a first flow-blocking ring located below the upper grinding disc. The first flow-blocking ring has multiple first flow-guiding holes at equal intervals in a vertically penetrating manner. The multiple first flow-guiding holes are venturi-shaped, with an inlet diameter of 5 mm, a throat diameter of 2 mm, and an outlet diameter of 4 mm. The outlet of the first flow-guiding hole is inclined towards the center of the first flow-blocking ring. The inner wall of the grinding ring is fixedly connected to a second flow-blocking ring located below the middle grinding disc. The second flow-blocking ring has multiple second flow-guiding holes at equal intervals in a vertically penetrating manner. The diameter of the multiple second flow-guiding holes is 2.5 mm.

6. The mixing device for manufacturing a PET anti-glare screen according to claim 1, wherein A drive shaft is rotatably connected through the upper cover plate. The lower end of the drive shaft is rotatably connected to the bottom wall plate of the housing. A first planetary gear transmission mechanism is installed at the center of the upper grinding disc, a second planetary gear transmission mechanism is installed at the center of the middle grinding disc, and a third planetary gear transmission mechanism is installed at the center of the lower grinding disc. The first, second, and third planetary gear transmission mechanisms are respectively mounted on the drive shaft. The transmission ratio of the first planetary gear transmission mechanism is 1:3, the transmission ratio of the second planetary gear transmission mechanism is 1:2, and the transmission ratio of the third planetary gear transmission mechanism is 1:1.

5. A high-speed motor is installed at the upper end of the drive shaft.

7. A mixing method for manufacturing a PET anti-glare screen, used in a mixing device for manufacturing a PET anti-glare screen according to claim 5, characterized in that, The mixing method includes: S1. Premix nano / micro-sized functional particles with resin matrix to form initial slurry; S2. The initial mixed slurry is pumped into the housing through the feeding assembly. The initial mixed slurry falls onto the upper grinding disc. When the upper grinding disc drives the saw tooth mechanism to rotate at high speed, the sharp edges of the saw tooth mechanism apply shearing and impact forces to the larger particles or agglomerates in the slurry, breaking them into millimeter or sub-millimeter particles. S3. The slurry particles after being ground and crushed by the upper grinding disc flow through the gap between the upper grinding disc and the grinding ring, and fall onto the middle grinding disc after being screened by multiple first guide holes on the first flow-blocking ring. This allows the slurry particles to be ground by magnetic grinding balls in the honeycomb groove. Under the high-speed rotation of the middle grinding disc, the magnetic grinding balls form a vortex motion along the honeycomb groove, which performs high-frequency collision and crushing on the particles to further reduce the size of the slurry particles. S4. The slurry particles after being ground and crushed by the middle grinding disc flow through the gap between the middle grinding disc and the grinding ring, and fall onto the lower grinding disc after being screened by multiple second guide holes on the second flow-blocking ring. When the slurry particles flow through the surface of the grating structure, they are subjected to the shearing force of the nano-scale grooves, further refining the slurry particles to the submicron or nano-scale. S5. Under the high-speed rotation of the upper, middle and lower grinding discs, the slurry particles on the grinding discs are thrown onto the side wall of the grinding ring under the action of centrifugal force. The material will be guided to flow through the spiral guide groove. Due to the reverse movement of the spiral guide groove and the grinding disc, a reverse shearing force is generated, which forces the slurry to form an upward and downward circulating flow in the areas of the upper, middle and lower grinding discs.

8. The mixing method for manufacturing a PET anti-glare screen according to claim 7, characterized in that, The gap between the upper grinding disc and the grinding ring is set to 2.5~3.5mm, and the rotation speed of the upper grinding disc is 500~1000rpm; the gap between the middle grinding disc and the grinding ring is 0.8~1.5mm, and the rotation speed of the middle grinding disc is 1500~2000rpm; the gap between the lower grinding disc and the grinding ring is 0.1~0.3mm, and the rotation speed of the lower grinding disc is 2500~3000rpm.

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