Mixing method for manufacturing PET anti-dazzle screen

Abstract

The invention discloses a mixing device and a mixing method for manufacturing a PET anti-dazzle screen, the mixing device comprises a mixing device body and a grinding and mixing structure, the mixing device body comprises a shell, and an upper cover plate is detachably mounted at the top of the shell; the grinding and mixing structure comprises a multi-stage gradient grinding assembly, and the multi-stage gradient grinding assembly comprises an upper grinding disc, a middle grinding disc and a lower grinding disc. According to the invention, a traditional step-by-step process is integrated into continuous treatment through an integrated grinding and mixing design, so that the mixing efficiency is improved while the process period is greatly shortened; the raw materials are ground and mixed through the multi-gradient grinding assembly, so that the dispersion uniformity of nano-particles is greatly improved, the rough microstructure caused by non-uniform mixing is fundamentally eliminated, the scattering effect of reflected light is improved, the dispersion capacity of nano-scale precious metal particles is improved, agglomeration of the nano-scale precious metal particles is avoided, and the service life of the nano-scale precious metal particles is prolonged. And the coating is low in brightness coefficient and stable in polarization ratio.

Description

Technical Field

[0001] The invention belongs to the technical field of optical material processing, and in particular relates to a mixing method for manufacturing a PET anti-glare screen. Background Art

[0002] PET anti-glare screens utilize a specific technology to reduce screen glare. They are primarily composed of polyethylene terephthalate (PET) film, silver paste, and an anti-glare coating. During the manufacturing process, the silver paste is applied to the front of the PET film, and the anti-glare coating is applied to the front of the silver paste. This structure effectively reduces reflection and scattering of light from the screen, thereby alleviating the impact of glare on viewers. The quality of the resulting PET anti-glare screen is directly affected by the mixing of the raw materials used during production.

[0003] In the production of PET anti-glare screens, the preparation of the anti-glare coating requires uniform mixing of nano / micron-sized functional particles (such as SiO2 and TiO2) with the resin matrix. The traditional mixing process requires step-by-step grinding and mixing, which prolongs the production cycle, resulting in low production efficiency and high energy consumption. Equipment switching also causes raw material loss and energy waste. Existing mixing devices have insufficient dispersion ability for nano-sized precious metal particles, which are prone to agglomeration, resulting in a low coating brightness coefficient and unstable polarization ratio. If the precious metal ion layer is unevenly distributed, the scattering angle and contrast of the screen will be reduced. At the same time, insufficient grinding and mixing of raw materials can lead to inconsistent surface microstructure roughness and poor reflected light scattering effect.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

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

[0006] In order to achieve the above object, a specific embodiment of the present invention provides the following technical solutions:

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

[0008] The mixing device body comprises a shell, the top of which is detachably mounted with an upper cover plate;

[0009] The grinding and mixing structure includes a multi-stage gradient grinding component, which realizes grinding of materials at different stages and improves the grinding effect and grinding efficiency of materials. The multi-stage gradient grinding component includes an upper grinding disc, a middle grinding disc and a lower grinding disc. The upper grinding disc, the middle grinding disc and the lower grinding disc are used to grind materials at different stages, and the three-stage grinding process of "coarse crushing-middle grinding-fine grinding" is realized through gradient crushing, solving the problem of low efficiency of a single grinding disc. The upper grinding disc, the middle grinding disc and the lower grinding disc are rotatably connected in the shell in an arrangement from top to bottom, so that the material is ground in sequence by the upper grinding disc, the middle grinding disc and the lower grinding disc. A plurality of sawtooth mechanisms are integrally formed on the upper grinding disc. When the upper grinding disc drives the plurality of sawtooth mechanisms to rotate at high speed, the sharp edges of the sawtooth mechanisms exert shearing force and impact force on the larger particles or agglomerates in the raw materials, breaking them into millimeter or submillimeter particles. The middle grinding disc is formed with multiple honeycomb grooves, each containing magnetic grinding balls. Driven by the high-speed rotation of the middle grinding disc, the magnetic grinding balls form a vortex motion along the honeycomb grooves, subjecting the particles to high-frequency collision and crushing, thereby achieving intermediate grinding of the material. The upper surface of the lower grinding disc is laser-etched with a grating structure. When particles flow over the grating surface, they are subjected to shear forces from the nanoscale grooves, further refining them to the submicron or nanometer scale. Simultaneously, the directional arrangement of the grating guides the slurry into laminar flow, reducing particle agglomeration caused by turbulence and ensuring uniform grinding. A removable grinding ring is mounted on the inner sidewall of the housing. The grinding ring forms a precise gap with the rotating upper, middle, and lower grinding discs. When slurry flows through this gap, the rotation of the dynamic grinding disc and the fixed position of the static ring generate shear and compression forces, crushing the particles to the target particle size. A rotating assembly is mounted within the housing to drive the upper, middle, and lower grinding discs.

[0010] In one or more embodiments of the present invention, a feed assembly and an air inlet pipe are mounted on the upper cover. The feed assembly is used to transport the material into the housing. The air inlet pipe is connected to an inert gas pipe to provide protective gas into the housing to ensure that the material is not oxidized during grinding and affects the stability of the resin. A vacuum pump interface is also provided on the top of the upper cover. By evacuating the housing to a vacuum state, bubbles in the slurry are eliminated, pinhole defects in the coating are reduced, and the mixing uniformity of high-solids slurries is improved. A guide plate is fixedly connected to the bottom of the housing, located below the feed assembly. The material input by the lower grinding disc is guided by the guide plate before being ground. Multiple discharge ports are evenly spaced on the bottom wall of the housing, each of which is equipped with a screen. A discharge hopper is fixedly connected to the outer side of the bottom wall of the housing. The discharge hopper is located below the multiple discharge ports. After grinding in the housing, the material is screened by the screen and discharged through the discharge hopper.

[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 thereof, wherein 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, wherein 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 balls is set to 0.2 mm. The sizes of the first annular groove and the first grinding beads, and the honeycomb groove and the magnetic grinding balls are set to fix the radial positions of the first grinding beads and the magnetic grinding balls, and to prevent the grinding beads from flying away 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 300 nm and 100 nm, respectively. The directional arrangement of the grating guides the slurry to form a 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 0.8~1.5 mm, and the depth is set to 0.5~1 mm. A plurality of second grinding beads are arranged in the second annular groove, and the particle size of the second grinding beads is set to 0.1~0.3 mm.

[0013] In one or more embodiments of the present invention, both the first and second grinding beads are configured as a core-shell structure, wherein the shell of the core-shell structure serves as a repair layer, and the core of the core-shell structure comprises a zirconia bead made of polyurethane. This polyurethane material allows the outer shells of the first and second grinding beads to release a repair agent to fill microcracks in the groove wall after wear, thereby reducing maintenance frequency.

[0014] In one or more embodiments of the present invention, a spiral guide groove is formed on the inner sidewall of the grinding ring. The spiral guide groove has a semicircular cross-section and rotates in the opposite direction of the multi-gradient grinding assembly. The spiral guide groove's rotation direction and the opposite motion of the multi-gradient grinding assembly generate a reverse shear force, forcing the slurry to form an "up-down" circulation flow in the upper, middle, and lower grinding discs, effectively preventing the material from flowing directly downward. When the upper, middle, and lower grinding discs rotate at high speeds, the material is thrown toward the edge of the cavity by centrifugal force, approaching the static grinding ring and entering 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 circulation. The spacing between the upper grinding disc and the grinding ring is set to 3-3.5 mm, the spacing between the middle grinding disc and the grinding ring is set to 1-1.5 mm, and the spacing between the lower grinding disc and the grinding ring is set to 0.2-0.3 mm. The gap between the grinding disc and the second annular groove is set to a gradient. This gradient creates a transition between the layers, so that when the material enters the lower layer from the upper layer, the gap suddenly narrows, forcing it to re-enter the high shear zone, preventing material particles from circumventing and ensuring thorough grinding and crushing at each layer. Multiple ultrasonic transducers are evenly spaced on the inner sidewall of the conical end of the housing to further disperse the ground material and prevent agglomeration.

[0015] In one or more embodiments of the present invention, a first flow control ring is fixedly connected to the inner sidewall of the grinding ring below the upper grinding disc. To prevent unground material on the upper grinding disc from directly leaking down, the first flow control ring is provided to restrict the downward movement of material. The first flow control ring is provided with multiple first flow guide holes, evenly spaced from top to bottom, extending vertically. This allows material to enter the lower layer only through the first flow guide holes, preventing insufficiently ground material from directly falling down. The multiple first flow guide holes are configured as Venturi-type holes, utilizing the Venturi effect to accelerate the passage of slurry while enhancing shear mixing. The inlet diameter of the first flow guide holes is 5 mm, the throat diameter of the first flow guide holes is 2 mm, and the outlet diameter of the first flow guide holes is 4 mm. The outlet of the first flow guide holes is inclined toward the center of the first flow control ring to guide material ground on the upper grinding disc to fall onto the middle grinding disc for further grinding. A second flow control ring is fixedly connected to the inner sidewall of the grinding ring below the middle grinding disc to restrict the downward movement of material not ground on the middle grinding disc. The second flow-blocking ring is provided with a plurality of second flow guide holes at equal intervals in a manner of passing through the upper and lower parts. The diameter of the plurality of second flow guide holes is set to 2.5 mm. The material ground by the middle grinding disc is transported to the lower grinding disc through the second flow guide holes for lower-level grinding.

[0016] In one or more embodiments of the present invention, a drive shaft is rotatably connected to the upper cover plate in a through-type manner, the lower end of the drive shaft is rotatably connected to the bottom wall plate of the shell, and the upper end of the drive shaft is installed with a high-speed motor. The drive shaft is driven to rotate at high speed by the high-speed motor. 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 planetary gear transmission mechanism, the second planetary gear transmission mechanism and the third planetary gear transmission mechanism are respectively installed on the drive shaft, and the rotation of the drive shaft can drive the first planetary gear transmission mechanism, the second planetary gear transmission mechanism and the third planetary gear transmission mechanism, thereby driving the upper grinding disc, the middle grinding disc and the lower grinding disc 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 grinding disc, the middle grinding disc and the lower grinding disc have different rotational speeds when in use, in order to drive the upper grinding disc, the middle grinding disc and the lower grinding disc to rotate at different rotational speeds through the drive shaft, the speed is controlled by setting the first planetary gear transmission mechanism, the second planetary gear transmission mechanism and the third planetary gear transmission mechanism with different transmission ratios.

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

[0018] S1. Premixing the nano / micron-sized functional particles with the resin matrix to form a primary mixed slurry;

[0019] S2. The pre-mixed slurry is pumped into the shell through the feed assembly. The pre-mixed slurry falls on the upper grinding disc. When the upper grinding disc drives the sawtooth mechanism to rotate at high speed, the sharp edges of the sawtooth mechanism exert shear force and impact force on the larger particles or agglomerates in the slurry, breaking them into millimeter or sub-millimeter particles.

[0020] S3, the slurry particles after grinding and crushing on the upper grinding disc flow through the gap between the upper grinding disc and the grinding ring, and are screened by the multiple first guide holes on the first flow blocking ring before falling onto the middle grinding disc, so that the slurry particles are ground by the magnetic grinding balls in the honeycomb grooves. Under the high-speed rotation of the middle grinding disc, the magnetic grinding balls form a vortex motion along the honeycomb grooves, performing high-frequency collision and crushing on the particles, thereby further reducing the slurry particles;

[0021] S4, the slurry particles after grinding and crushing on the middle grinding disc flow through the gap between the middle grinding disc and the grinding ring, and are screened by the multiple second guide holes on the second blocking ring before falling onto the lower grinding disc. When the slurry particles flow through the surface of the grating structure, they are subjected to the shear force of the nano-scale grooves, further refining the slurry particles to submicron or nanometer levels;

[0022] S5. When the upper, middle and lower grinding discs rotate at high speed, 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, reverse shear force is generated, forcing 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 before passing 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 the existing technology, the present invention integrates the traditional step-by-step process into a continuous process through an integrated grinding and mixing design, which greatly shortens the process cycle while improving the mixing efficiency; the raw materials are ground and mixed by a multi-gradient grinding component, so that the dispersion uniformity of the nanoparticles is greatly improved, and the rough microstructure caused by uneven mixing is eliminated from the root, the scattering effect of reflected light is improved, and the dispersion ability of nano-level precious metal particles is improved to avoid their agglomeration, so that the coating brightness coefficient is low and the polarization ratio is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0027] Figure 2 A cross-sectional view of a mixing device for manufacturing a PET anti-glare screen according to one embodiment of the present invention;

[0028] Figure 3 A cross-sectional view of a mixing device for manufacturing a PET anti-glare screen according to one embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the multi-stage gradient grinding assembly of the present invention;

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

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

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

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

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

[0035] Description of main reference numerals:

[0036] 1-mixing device body, 11-housing, 12-upper cover, 13-feeding assembly, 14-guide plate, 15-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-first An annular groove, 210-first grinding beads, 211-honeycomb groove, 212-magnetic grinding beads, 213-grating structure, 214-second annular groove, 215-second grinding beads, 216-oxidized beads, 217-repairing layer, 218-spiral guide groove, 219-first blocking ring, 220-first guide hole, 221-second blocking ring, 222-second guide hole, 223-ultrasonic transducer, 224-drive shaft, 225-high-speed motor. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

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

[0039] like Figures 1 to 3As shown, the mixing device body 1 includes a shell 11, and an upper cover plate 12 is detachably mounted on the top of the shell 11. The easy disassembly of the upper cover plate 12 makes it easy to maintain the components in the shell 11.

[0040] like Figures 1 to 3 As shown, the upper cover plate 12 is mounted with a feed assembly 13 and an air inlet pipe 15. The feed assembly 13 is used to transport the material into the housing 11. The air inlet pipe 15 is connected to an inert gas pipe, which is used to provide protective gas into the housing 11 to ensure that the material will not be oxidized during grinding and affect the stability of the resin. A vacuum pump interface is also added to the top of the upper cover plate 12. By evacuating the housing 11 to a vacuum state, it eliminates slurry bubbles, reduces coating pinhole defects, and improves the mixing uniformity of high-solids slurries. A guide plate 14 is fixedly connected to the bottom of the housing 11, located below the feed assembly 13. The material input from the lower grinding disc 23 is ground after being guided by the guide plate 14. A plurality of discharge ports 16 are provided at equal intervals on the bottom wall panel of the shell 11, and a screen 17 is installed on each of the discharge ports 16. A discharge hopper 18 is fixedly connected to the outer side of the bottom wall panel of the shell 11, and the discharge funnel 18 is arranged below the plurality of discharge ports 16. After the material is ground in the shell 11, it is screened by the screen 17 and then discharged through the diversion of the discharge funnel 18.

[0041] like Figures 1 to 4As shown, the grinding and mixing structure 2 includes a multi-stage gradient grinding assembly, which achieves different stages of grinding of the material, improving the grinding effect and grinding efficiency. The multi-stage gradient grinding assembly includes an upper grinding disc 21, a middle grinding disc 22, and a lower grinding disc 23. The upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23 are used to grind the material at different stages. Through gradient crushing, a three-stage grinding process of "coarse crushing-intermediate grinding-fine grinding" is achieved, solving the problem of low efficiency of a single grinding disc. The upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23 are rotatably connected to the housing 11 in a top-to-bottom arrangement, so that the material is ground sequentially by the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23. The upper grinding disc 21 is integrally formed with multiple serrations 28. When the upper grinding disc 21 drives the multiple serrations 28 to rotate at high speed, the sharp edges of the serrations 28 apply shear and impact forces to larger particles or agglomerates in the raw material, breaking them into millimeter-sized or submillimeter-sized particles. The middle grinding disc 22 is provided with a plurality of honeycomb grooves 211, each of which is equipped with magnetic grinding balls 212. 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, subjecting the particles to high-frequency collision and crushing, thereby achieving intermediate 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 shear force of the nanoscale grooves, further refining them to the submicron or nanometer level. 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 removably mounted on the inner side wall of the housing 11. The grinding ring 24 forms a precise gap with 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 jointly generate shear and extrusion forces, crushing the particles to the target particle size. A rotating assembly is installed in the housing 11 , and 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, and the alternating magnetic field generated by the external electromagnetic coil controls the movement trajectory of the magnetic grinding ball 212 so that it covers every corner of the honeycomb groove 211, avoiding uneven grinding caused by "dead corners".

[0043] like Figure 3 Combine Figure 5As shown, the upper surface of the upper grinding disc 21 is provided with a first annular groove 29 at the edge thereof. The width of the first annular groove 29 is set to 5-8 mm and the depth is set to 3-5 mm. A plurality of first grinding beads 210 are disposed within the first annular groove 29. The particle size of the first grinding beads 210 is set to 1-2 mm. The diameter and depth of the honeycomb groove 211 are set to 1 mm and 2 mm, respectively. The particle size of the magnetic grinding balls 212 is set to 0.2 mm. The first annular groove 29 and the first grinding beads 210, as well as the honeycomb groove 211 and the magnetic grinding balls 212, are sized to fix the radial position of the first grinding beads 210 and the magnetic grinding balls 212, thereby preventing 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, reduces the particle agglomeration caused by turbulence, and ensures uniform grinding. The upper surface of the lower grinding disc 23 is provided with a second annular groove 214 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 arranged in the second annular groove 214, and the particle size of the second grinding beads 215 is set to 0.1~0.3mm.

[0045] Preferably, first and second annular grooves 29, 214 are formed on the edges of the upper and lower grinding discs 21, 23, respectively, and first and second grinding beads 210, 215 are positioned within the first and second annular grooves 29, 214. The geometric shapes of the first and second annular grooves 29, 214 align with the direction of the grinding discs' rotation, forcing the first and second grinding beads 210, 215 to form spiral motion paths within the grooves, extending their contact path with the material. Furthermore, the gap between the grinding discs and the second annular grooves 214 forms a narrow channel, and the rolling of the first and second grinding beads 210, 215, combined with the shear force of the slurry's flow, is particularly suitable for nano-particle refinement.

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

[0047] like Figure 3As shown, a spiral guide groove 218 is provided on the inner side wall of the grinding ring 24. The cross-section of the spiral guide groove 218 is semicircular, and the direction of rotation of the spiral guide groove 218 is opposite to the direction of rotation of the multi-gradient grinding assembly. The rotation direction of the spiral guide groove 218 and the reverse motion of the multi-gradient grinding assembly generate a reverse shear force, forcing the slurry to form an "up-down" circulation flow in the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23, respectively, 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 to the edge of the cavity by centrifugal force, so as to 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 spacing between the upper grinding disc 21 and the grinding ring 24 is set to 3-3.5 mm, the spacing between the middle grinding disc 22 and the grinding ring 24 is set to 1-1.5 mm, and the spacing between the lower grinding disc 23 and the grinding ring 24 is set to 0.2-0.3 mm. The gap between the grinding disc and the second annular groove 214 is set to a gradient. This gradient creates a hierarchical transition, so that when the material enters the lower layer from the upper layer, the gap suddenly narrows, forcing it to re-enter the high shear zone, preventing material particles from circumventing and ensuring thorough grinding and crushing at each level. Multiple ultrasonic transducers 223 are evenly spaced and mounted on the inner sidewall of the tapered bottom end of the housing 11. These ultrasonic transducers 223 further disperse the ground material to prevent agglomeration.

[0048] like Figure 3 Combine Figure 8 and Figure 9As shown, a first flow control ring 219 is fixedly attached to the inner wall of the grinding ring 24 below the upper grinding disc 21. To prevent unground material from directly leaking down from the upper grinding disc 21, the first flow control ring 219 restricts the downward movement of material. The first flow control ring 219 is provided with multiple first guide holes 220 at equal intervals, extending vertically and horizontally. This allows material to enter the lower layer only through the first guide holes 220, preventing insufficiently ground material from directly falling. The multiple first guide holes 220 are configured as Venturi-type, utilizing the Venturi effect to accelerate the passage of slurry while enhancing shear mixing. The inlet diameter of the first guide hole 220 is 5 mm, the throat diameter of the first guide hole 220 is 2 mm, and the outlet diameter of the first guide hole 220 is 4 mm. The outlet of the first guide hole 220 is tilted toward the center of the first flow control ring 219 to guide the material, after being ground on the upper grinding disc 21, to fall onto the middle grinding disc 22 for further grinding. A second flow control ring 221 is fixedly attached to the inner sidewall of the grinding ring 24, below the middle grinding disc 22. This second flow control ring 221 is used to limit the downward movement of material that has not been ground by the middle grinding disc 22. Multiple second flow guide holes 222 are evenly spaced and extend through the second flow control ring 221. The diameter of these second flow guide holes 222 is set to 2.5 mm. These second flow guide holes 222 transport the material ground by the middle grinding disc 22 to the lower grinding disc 23 for further grinding.

[0049] like Figures 2 to 4 As shown, a drive shaft 224 is rotatably connected to the upper cover plate 12. The lower end of the drive shaft 224 is rotatably connected to the bottom wall plate of the housing 11. A high-speed motor 225 is mounted 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 mounted at the center of the upper grinding disc 21, a second planetary gear transmission mechanism 26 is mounted at the center of the middle grinding disc 22, and a third planetary gear transmission mechanism 27 is mounted at the center of the lower grinding disc 23. The first, second, and third planetary gear transmission mechanisms 25, 26, and 27 are respectively mounted on the drive shaft 224. Rotation of the drive shaft 224 drives the first, second, and third planetary gear transmission mechanisms 25, 26, and 27, thereby driving the rotation of the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23. 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 have different rotational speeds when in 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 through the drive shaft 224, the speed is controlled by setting 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.

[0050] In another embodiment of the present invention, a mixing method for manufacturing a PET anti-glare screen comprises:

[0051] S1. Premixing the nano / micron-sized functional particles with the resin matrix to form a primary mixed slurry;

[0052] S2. The pre-mixed slurry is pumped into the housing 11 through the feed assembly 13. The pre-mixed slurry falls on the upper grinding disc 21. When the upper grinding disc 21 drives the sawtooth mechanism 28 to rotate at high speed, the sharp edges of the sawtooth mechanism 28 exert shear force and impact force on the larger particles or agglomerates in the slurry, breaking them into millimeter or sub-millimeter particles.

[0053] S3, the slurry particles after grinding and crushing on the upper grinding disc 21 flow through the gap between the upper grinding disc 21 and the grinding ring 24, and are screened by the multiple first guide holes 220 on the first flow blocking ring 219 and then fall on the middle grinding disc 22, so that the slurry particles are ground by the magnetic grinding balls 212 in the honeycomb grooves 211. Under the high-speed rotation of the middle grinding disc 22, the magnetic grinding balls 212 form a vortex motion along the honeycomb grooves 211, performing high-frequency collision and crushing on the particles, so as to further reduce the slurry particles;

[0054] S4: The slurry particles 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 are screened by the multiple second guide holes 222 on the second blocking ring 221 before falling onto the lower grinding disc 23. When the slurry particles flow through the surface of the grating structure 213, they are subjected to the shear force of the nano-scale grooves, further refining the slurry particles to submicron or nanometer levels.

[0055] S5. When the upper grinding disc 21, the middle grinding disc 22 and the lower grinding disc 23 rotate at high speed, the slurry particles on the grinding discs are thrown onto the side wall of the grinding ring 24 under the action of centrifugal force, and the material will be guided to flow through the spiral guide groove 218. Since the reverse movement of the spiral guide groove 218 and the grinding discs generates reverse shear force, the slurry is forced to form an upward and downward circulation flow in 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 before passing 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 2.5-3.5 mm, and the rotation speed of the upper grinding disc 21 is 500-1000 rpm; the gap between the middle grinding disc 22 and the grinding ring 24 is 0.8-1.5 mm, and the rotation speed of the middle grinding disc 22 is 1500-2000 rpm; the gap between the lower grinding disc 23 and the grinding ring 24 is 0.1-0.3 mm, and the rotation speed of the lower grinding disc 23 is 2500-3000 rpm. Thus, the different rotation speeds of the upper grinding disc 21, the middle grinding disc 22, and the lower grinding disc 23 achieve a three-stage process of coarse crushing, intermediate grinding, and fine grinding of the material, ensuring that the material is crushed into nanoparticles and evenly dispersed, preventing material agglomeration, thereby improving the quality of the produced 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 embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0058] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A mixing device for manufacturing PET anti-glare screens, characterized in that: include: The mixing device body comprises a shell, the top of which is detachably mounted with an upper cover plate; The grinding and mixing structure includes a multi-stage gradient grinding assembly, which includes an upper grinding disc, a middle grinding disc and a lower grinding disc. The upper grinding disc, the middle grinding disc and the lower grinding disc are rotatably connected in a shell in an arrangement from top to bottom. The upper grinding disc is integrally formed with multiple serration mechanisms, the middle grinding disc is provided with multiple honeycomb grooves, and magnetic grinding balls are provided in the multiple honeycomb grooves. The upper surface of the lower grinding disc is laser-etched with a grating structure, and a grinding ring is detachably installed on the inner side wall of the shell. A rotating assembly is installed in the shell, and the rotating assembly is used to drive the upper grinding disc, the middle grinding disc and the lower grinding disc to rotate.

2. A mixing device for manufacturing PET anti-glare screen according to claim 1, characterized in that: A feed assembly and an air inlet pipe are installed on the upper cover plate, a guide plate is fixedly connected to the bottom of the shell at the lower side of the feed assembly, a plurality of discharge ports are opened on the bottom wall plate of the shell at equal intervals, and a screen is installed on each of the plurality of discharge ports, a discharge funnel is fixedly connected to the outer side of the bottom wall plate of the shell, and the discharge funnel is arranged below the plurality of discharge ports.

3. A mixing device for manufacturing PET anti-glare screen according to claim 1, characterized in that: A first annular groove is provided on the upper surface of the upper grinding disc at the edge thereof, wherein 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 provided in the first annular groove, wherein 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 balls is set to 0.2 mm.

4. A mixing device for manufacturing PET anti-glare screen according to claim 3, characterized in that: The period and depth of the grating structure are 300nm and 100nm respectively. A second annular groove is provided on the upper surface of the lower grinding disc 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, and the particle size of the second grinding beads is set to 0.1~0.3mm.

5. A mixing device for manufacturing PET anti-glare screen according to claim 4, characterized in that: The first grinding bead and the second grinding bead are both configured as a core-shell structure, the shell of the core-shell structure is a repair layer, the core of the core-shell structure is a zirconia bead, and the zirconia bead is made of polyurethane material.

6. A mixing device for manufacturing PET anti-glare screen according to claim 1, characterized in that: A spiral guide groove is provided on the inner side wall of the grinding ring. The cross-section of the spiral guide groove is semicircular. The rotation direction of the spiral guide groove is opposite to the rotation direction of the multi-gradient grinding assembly. The spacing between the upper grinding disc and the grinding ring is set to 3~3.5mm, the spacing between the middle grinding disc and the grinding ring is set to 1~1.5mm, and the spacing 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 side wall of the tapered end of the bottom of the shell.

7. A mixing device for manufacturing PET anti-glare screen according to claim 1, characterized in that: The inner side wall of the grinding ring is fixedly connected to a first baffle ring below the upper grinding disc, and the first baffle ring is provided with a plurality of first guide holes at equal intervals in a vertically penetrating manner, and the plurality of first guide holes are arranged into a Venturi type, and the inlet diameter of the first guide hole is set to 5 mm, the throat diameter of the first guide hole is 2 mm, the outlet diameter of the first guide hole is 4 mm, and the outlet of the first guide hole is arranged to be inclined toward the center of the first baffle ring. The inner side wall of the grinding ring is fixedly connected to a second baffle ring below the middle grinding disc, and the second baffle ring is provided with a plurality of second guide holes at equal intervals in a vertically penetrating manner, and the diameter of the plurality of second guide holes is set to 2.5 mm.

8. A mixing device for manufacturing PET anti-glare screen according to claim 1, characterized in that: A drive shaft is rotatably connected to the upper cover plate in a penetrating manner, and the lower end of the drive shaft is rotatably connected to the bottom wall plate of the shell. 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 planetary gear transmission mechanism, the second planetary gear transmission mechanism and the third planetary gear transmission mechanism are respectively installed 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.

9. A mixing method for producing a PET anti-glare screen, used in a mixing device for producing a PET anti-glare screen as claimed in any one of claims 1 to 8, characterized in that: The hybrid method includes: S1. Premixing the nano / micron-sized functional particles with the resin matrix to form a primary mixed slurry; S2. The pre-mixed slurry is pumped into the shell through the feed assembly. The pre-mixed slurry falls on the upper grinding disc. When the upper grinding disc drives the sawtooth mechanism to rotate at high speed, the sharp edges of the sawtooth mechanism exert shear force and impact force on the larger particles or agglomerates in the slurry, breaking them into millimeter or sub-millimeter particles. S3, the slurry particles after grinding and crushing on the upper grinding disc flow through the gap between the upper grinding disc and the grinding ring, and are screened by the multiple first guide holes on the first flow blocking ring before falling onto the middle grinding disc, so that the slurry particles are ground by the magnetic grinding balls in the honeycomb grooves. Under the high-speed rotation of the middle grinding disc, the magnetic grinding balls form a vortex motion along the honeycomb grooves, performing high-frequency collision and crushing on the particles, thereby further reducing the slurry particles; S4, the slurry particles after grinding and crushing on the middle grinding disc flow through the gap between the middle grinding disc and the grinding ring, and are screened by the multiple second guide holes on the second blocking ring before falling onto the lower grinding disc. When the slurry particles flow through the surface of the grating structure, they are subjected to the shear force of the nano-scale grooves, further refining the slurry particles to submicron or nanometer levels; S5. As the upper, middle and lower grinding discs rotate at high speed, 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 flow through the spiral guide groove. Due to the reverse movement of the spiral guide groove and the grinding disc, reverse shear force is generated, forcing the slurry to form an upward and downward circulation flow in the upper, middle and lower grinding disc areas.

10. The mixing method for producing a PET anti-glare screen according to claim 9, 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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