Durable nonwoven polishing article and method of producing the same

Abstract

The application discloses a durable non-woven polishing product and a production method thereof, and the durable non-woven polishing product comprises a fiber non-woven fabric substrate and a slurry coated on the fiber non-woven fabric substrate, the slurry comprises hard glue, soft glue, abrasive, filler and auxiliary agent, the glue part is composed of the hard glue and the soft glue, and the glue part is a water-based glue system, and the elasticity of the product is adjusted by changing the proportion. The slurry system of the durable non-woven polishing product is an environment-friendly compound water-based glue system, the problem that a large amount of organic solvent is used as a diluent in the existing winding roller process to generate a large amount of emissions is solved, the wear resistance of the polishing product is excellent, and meanwhile, the production method shortens the required curing process time to one third of the original time, and the energy consumption is reduced to less than 20% of the original energy consumption.

Description

Technical Field

[0001] This invention relates to a polishing product suitable for polishing machine tools, and more particularly to a durable nonwoven polishing product and its manufacturing method. Background Technology

[0002] Coiled rollers belong to the category of elastic abrasives within the abrasives and are a type of nylon wheel or polishing wheel. Compared to domestically mass-produced fiber polishing wheels, coiled rollers have a higher density and are 2-8 times more durable than laminated fiber polishing wheels, resulting in more consistent surface finishes. These unique characteristics make coiled rollers irreplaceable in metal processing, deburring, and finishing. They are widely used in various fields, including engine blades, sports equipment, medical devices, mechanical shaft parts, and household hardware.

[0003] The winding roller is made by coating industrial nylon fiber nonwoven fabric and scouring pad with a roller coating method, then winding it into a rod on a special core tube and baking it for curing. The coating contains binders, abrasives, fillers, and various additives, and the size of the winding rod ranges from 150mm to 600mm. Due to differences in the composition of the coating and the process, the performance of the finished winding roller varies greatly. Currently, there are two main winding roller formulation systems internationally. Europe and the United States are currently the mainstream suppliers of winding roller products globally, with a global market share of over 80%, and they widely use non-environmentally friendly polyurethane formulation systems. The advantages of this system are good product performance, durability, and elasticity; the disadvantages are VOC emissions and long curing time, with some large-size, high-density products requiring baking at 130 degrees Celsius for 36-48 hours or more. The other system is the domestically produced non-environmentally friendly epoxy toughening system. Its advantages are low cost, strong cutting force, and short curing time. The disadvantages are poor product durability, generally only 1 / 4 or even less of that of polyurethane systems, high product hardness, poor grinding effect and user experience, and VOC emissions.

[0004] For different technical routes, the current product processes all have certain difficulties or disadvantages: (1) The difference in density and size of polyurethane system roll rods leads to complex curing processes, long processes, high energy consumption, or insufficient curing and high VOC emissions. (2) For epoxy system roll rollers, due to the limitations of their performance, there is currently no significant breakthrough in durability and elasticity. At the same time, there are also VOC emission problems. In addition, due to the different reaction rates of amine curing agents in epoxy systems at different climatic temperatures, the performance of finished products also fluctuates with temperature. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art and to propose a durable nonwoven polished product for processing winding wheels, as well as a production method for using it for processing winding wheels, in response to the numerous defects of traditional winding wheels. By combining a new formula and a new process, the shortcomings of the prior art are effectively solved.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] This invention provides a durable nonwoven polishing article, comprising a fiber nonwoven fabric matrix and a slurry coated on the fiber nonwoven fabric matrix, wherein the slurry comprises hard adhesive, soft adhesive, abrasive, filler, and additives, wherein:

[0008] The hard adhesive is an aqueous liquid phenolic resin comprising 5%-20% of the slurry by mass, the soft adhesive is at least one of an aqueous polyurethane emulsion, an aqueous nitrile emulsion, and an aqueous acrylic emulsion comprising 10%-40% of the slurry by mass, and the abrasive comprises 30%-65% of the slurry by mass.

[0009] Furthermore, the abrasive includes at least one of silicon carbide, brown fused alumina, white fused alumina, zirconium fused alumina, garnet, corundum, ceramic fused alumina, and diamond.

[0010] Furthermore, the filler is at least one of calcium carbonate, lepidocrocite, and aluminum hydroxide.

[0011] Furthermore, the additive is at least one of pigments, color pastes, antisettling agents, solubilizers, grinding aids, and endothermic additives such as stearic acid.

[0012] Furthermore, the resin solids content of the hard adhesive is 60-80%, its pH value is 8.0-9.0, its water solubility is 300%-1000%, and its gelation time at 130 degrees Celsius is 50-90 seconds.

[0013] Furthermore, the resin solids content of the soft adhesive is 40-60%, its pH value is 8.0-9.0, and its glass transition temperature is -10℃-30℃.

[0014] The present invention also provides a method for producing the above-mentioned durable nonwoven polished article, characterized by comprising the following steps:

[0015] S1: Prepare the slurry by mixing the hard and soft adhesives evenly according to their mass fractions, and then adding the additives, fillers, and abrasives in sequence to prepare a uniform slurry with a solid content of 60%-90% and a viscosity of 2000-20000cps.

[0016] S2: Coating slurry. The slurry prepared in S1 is uniformly coated onto the nonwoven fabric substrate by roller coating. The coating amount is 0.9-2.0 kg per square meter.

[0017] S3: Winding and curing. The coated nonwoven fabric is wound onto a porous winding tube, and hot air is circulated through the pores of the tube for rapid curing.

[0018] Furthermore, the porous winding tube is provided with a ventilation device for accelerating the circulation of hot air. The ventilation device includes a first cylinder coaxially fixed in the porous winding tube, and a first air inlet is evenly provided on the central side of the first cylinder. One end of the first cylinder serves as the air inlet to allow high-speed airflow to enter, and the other end serves as the air outlet to allow high-speed airflow to exit.

[0019] Furthermore, the ventilation device also includes a self-sealing component, which includes elastic sealing rings sleeved on both ends of the first cylinder and a sealing ring assembly for fixing the elastic sealing rings. The inner side of the elastic sealing ring has a thrust inclined surface.

[0020] The sealing ring assembly includes:

[0021] A fixing ring is disposed between the central side of the first cylinder and the end of the first cylinder, and protrudes radially outward from the first cylinder; and a movable groove is evenly provided along the circumference of the first cylinder between the fixing ring and the end of the first cylinder.

[0022] A movable ring is assembled at the end of the first cylinder and forms an annular cavity with the fixed ring to accommodate an elastic sealing ring;

[0023] The extrusion ring is embedded between the elastic sealing ring and the first cylinder and can slide axially within the annular cavity. The outer surface of the extrusion ring and the thrust slope of the elastic sealing ring form a slope pair.

[0024] A bottomless thrust cylinder is provided inside the air inlet. The bottom plate of the thrust cylinder has an air inlet hole along the air inlet direction. A limiting platform is provided on the inner side of the first cylinder corresponding to the thrust cylinder, and a reset spring is provided between the thrust cylinder and the limiting platform.

[0025] A driven cylinder is provided inside the air outlet, and the driven cylinder is linked with the thrust cylinder;

[0026] The extrusion ring and the thrust cylinder, as well as the extrusion ring and the driven cylinder, are fixedly connected by a connecting piece that passes through the movable groove.

[0027] Furthermore, the ventilation device also includes a second cylinder assembly, the second cylinder assembly comprising:

[0028] The second cylinder is coaxially fixed inside the first cylinder and is axially located between the thrust cylinder and the driven cylinder; a support plate for fixing the second cylinder is radially and uniformly arranged in the annular space between the second cylinder and the first cylinder, and a second air vent is provided through the support plate to connect the inner cavity of the second cylinder and the outside of the first cylinder.

[0029] A rotating shaft is located on the axis of the second cylinder. One end of the rotating shaft extends into the thrust cylinder and is fitted with a turbofan driven by the high-speed airflow at the inlet end. The other end of the rotating shaft extends into the driven cylinder.

[0030] Several helical blades are uniformly spiraled between the rotating shaft and the second cylinder; the helical blades can rotate as driven by the turbofan to exhaust the airflow inside the second cylinder;

[0031] A sleeve is disposed at the center of the driven cylinder via a radially fixed connecting rod, and the sleeve is used to rotatably connect the end of the rotating shaft.

[0032] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0033] This invention employs a novel water-based compound adhesive system for preparing coating slurries for polishing products, particularly for processing coiled polishing wheels. It also helps reduce VOC emissions, solving the problem of excessive emissions caused by the extensive use of organic solvents as diluents in existing coiled wheel processes. Furthermore, its wear resistance reaches an industry-leading level.

[0034] This invention also provides a curing process for processing rolled polishing wheels using the polishing products of this invention. Hot air circulation is carried out through a multi-hole winding tube and a ventilation device to quickly remove moisture and thus cure the product. Compared with the existing glass fiber pultrusion tube process, this curing method improves the moisture removal effect by more than 5 times and shortens the curing time by more than 3 times. Attached Figure Description

[0035] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0036] Figure 1 This is a schematic diagram of the existing winding and curing process.

[0037] Figure 2 This is a schematic diagram of the winding and curing process in this invention.

[0038] Figure 3 This is an assembly diagram of the curing process in one embodiment of the present invention.

[0039] Figure 4This is an exploded view of the ventilation device in one embodiment of the present invention.

[0040] Figure 5 This is a front view of the present invention in the winding and curing process.

[0041] Figure 6 yes Figure 5 A schematic diagram of the AA section structure.

[0042] Figure 7 yes Figure 5 Side view of the middle.

[0043] Figure 8 This is a partial schematic diagram of the air inlet end of the ventilation device in one embodiment of the present invention.

[0044] Figure 9 This invention is in Figure 6 A schematic diagram of airflow direction.

[0045] In the picture:

[0046] 100. Fiber cloth; 200. Perforated winding tube; 300. Ventilation device;

[0047] 310. First cylinder body; 311. First air inlet; 312. Fixed ring; 313. Moving ring; 314. Limiting platform; 315. Movable groove; 316. Air inlet end; 317. Air outlet end.

[0048] 320. Elastic sealing ring;

[0049] 330. Extrusion ring;

[0050] 340. Thrust cylinder; 341. Air inlet;

[0051] 350. Second cylinder; 351. Rotating shaft; 352. Spiral blade; 353. Turbofan; 354. Support plate; 355. Second air intake hole;

[0052] 360. Driven cylinder; 361. Sleeve; 362. Connecting rod. Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0054] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] In this invention, the nonwoven fabric is made of polyamide short fibers. These fibers are carded in different proportions, cross-laid, and formed into a web using a Rando airflow. The resulting nonwoven fabric is then coated with water-based adhesive by rollers and dried and cured in a tunnel oven to obtain the desired nonwoven fabric.

[0057] The polyamide fiber refers to polyamide hexa-1 or polyamide bis-6 fiber; the fiber thickness is different, such as 15 denier, 30 denier, 50 denier, 70 denier, etc., and the length of a single fiber varies from 40mm to 70mm.

[0058] The water-based adhesives include water-based polyurethane adhesives, water-based acrylic adhesives, water-based nitrile emulsions, water-based phenolic adhesives, etc.

[0059] The nonwoven fabric has a weight of 120-350 grams per square meter and a thickness of 8-15 mm.

[0060] Example 1

[0061] 40mm long 15-denier nylon short fibers (Invista nylon double 6 fibers) are carded, laid, and air-laid to obtain a uniform 180 g / m² nonwoven fabric substrate with a thickness of 15mm. This substrate is then roller-coated with 50g of dry water-based polyurethane adhesive, model Alberdingk U7640, with a solid content of 39-41%. The coating formulation is 60% polyurethane emulsion and 40% water. After coating and drying, the finished fiber web is obtained, weighing 230 g / m².

[0062] Slurry formulation: 15% water-based liquid phenolic resin, 35% water-based polyurethane emulsion U7640, 40% primary silicon carbide abrasive P180, 5% calcium carbonate (filler), and 2% stearic acid (additive). Stir thoroughly to prepare a slurry with a viscosity of approximately 8000 cps. Apply 1200 grams of wet adhesive per square meter using a two-roll extrusion coating process.

[0063] Approximately 18 meters of coated nonwoven fabric is wound onto a pre-fabricated porous take-up tube 200 with an outer diameter of 90 mm and an inner diameter of 76 mm to form a winding wheel. The porous take-up tube 200 is made by impregnating thermosetting resin and fiberglass mesh fabric, with a porosity of 30-70%. Using a winding machine, the 18 meters of fabric are evenly wound into a rod with an outer diameter of 230 mm and placed in a curing chamber at a temperature of 90-150 degrees Celsius. Figure 2 As shown, negative pressure is applied to the inside of the porous tube, and hot air passes through the winding wheel from the curing box and enters the porous take-up tube. Then it is sent to the circulating fan, and the curing time is 5-8 hours.

[0064] After curing, the outer diameter of the rod is ground to 203mm, and then slit into coiling wheels of different thicknesses. The finished products have a good appearance, consistent curing inside and out, and moderate hardness. The roughness Ra is measured to be 0.1 micrometers, the hardness is Shore A 88 degrees, and the wear resistance of the coiling wheels is tested under 6 kg pressure. The cutting / wear ratio is between 400-800%, which is comparable to imported products.

[0065] Example 2

[0066] 40mm long 30-denier nylon short fibers (Invista nylon double 6 fibers) are carded, laid, and air-laid to obtain a uniform 180 g / m² nonwoven fabric substrate with a thickness of 15mm. This substrate is then roller-coated with 50g of dry water-based polyurethane adhesive, model Alberdingk U7640, with a solid content of 39-41%. The coating formulation is 60% polyurethane emulsion and 40% water. After coating and drying, the finished fiber web is obtained, weighing 230 g / m².

[0067] Slurry formulation: 20% water-based liquid phenolic resin, 32% water-based nitrile butadiene emulsion LITEN NX1200 (manufactured by Synthomer), 40% primary silicon carbide abrasive P80, 5% calcium carbonate (filler), and 3% stearic acid (additive). Stir thoroughly to prepare a slurry with a viscosity of approximately 6000 cps. Apply 1400 grams of wet adhesive per square meter using a two-roll extrusion coating process.

[0068] Manufacturing process: Approximately 35 meters of coated nonwoven fabric is wound onto a pre-made porous take-up tube 200 with an outer diameter of 145 mm and an inner diameter of 127 mm to form a winding wheel. The 35 meters of fabric are then evenly wound into a rod with an outer diameter of 330 mm using a winding machine. The rod is then placed in a curing chamber and cured at 90-150 degrees Celsius. Figure 2 As shown, the inside of the porous take-up tube 200 is evacuated under negative pressure. Hot air passes through the winding wheel from the curing box and enters the porous take-up tube 200. Then it is sent to the circulating fan. The curing time is 6-9 hours.

[0069] After curing, the outer diameter of the rod is ground to 305mm, and then slit into coiling wheels of different thicknesses. The finished products have a good appearance, consistent curing inside and out, and moderate hardness. The roughness Ra is measured to be 0.25 micrometers, and the hardness is Shore A 90 degrees. The wear resistance of the coiling wheels is tested under 6 kg pressure, and the cutting / wear ratio is between 300-600%, which is comparable to imported products.

[0070] Example 3

[0071] 65mm long 15-denier nylon short fibers (Invista nylon double 6 fibers) are carded, laid out, and air-laid to obtain a uniform 140 g / m² nonwoven fabric substrate with a thickness of 15mm. This is then roller-coated with 50g of dry water-based phenolic resin, model Alberdingk U6150, with a solid content of 39-41%. The coating formulation consists of 60% polyurethane emulsion and 40% water. After coating and drying, the finished fiber web weighs 230 g / m².

[0072] Slurry formulation: 12% water-based liquid phenolic resin, 39% water-based acrylic emulsion, 45% primary silicon carbide abrasive P120, 2.5% zinc stearate, and 1.5% titanium dioxide. Stir thoroughly to prepare a slurry with a viscosity of approximately 6000 cps. Apply 1400 grams of wet adhesive per square meter using a two-roll extrusion coating process.

[0073] Manufacturing process: Approximately 13 meters of coated nonwoven fabric is wound onto a pre-made porous take-up tube 200 with an outer diameter of 38 mm and an inner diameter of 25.4 mm to form a winding wheel. The 13 meters of fabric is then evenly wound into a rod with an outer diameter of 330 mm using a rod winding machine. The rod is then placed in a curing chamber and kept at a temperature of 90-150 degrees Celsius. A ventilation device 300 is placed inside the porous take-up tube 200. Hot air passes through the winding wheel from the curing chamber, enters the porous take-up tube 200, and is exhausted by the ventilation device 300. The hot air is then sent to a circulating fan, and the curing time is 5-7 hours.

[0074] After curing, the outer diameter of the rod is ground to 152mm, and then slit into coiling wheels of different thicknesses. The finished products have a good appearance, consistent curing inside and out, and moderate hardness. The roughness Ra is measured to be 0.19 micrometers, and the hardness is Shore A 90 degrees. The wear resistance of the coiling wheels is tested under 6 kg pressure, and the cutting / wear ratio is between 300-600%, which is comparable to imported products.

[0075] In other embodiments of the present invention, the slurry formulation comprises 5%-20% aqueous liquid phenolic resin, 10%-40% aqueous polyurethane emulsion, and the ratio of hard and soft adhesives can be changed to adjust the product's elasticity. Primary silicon carbide abrasive P120 comprises 30%-65% (the abrasive can also be brown fused alumina, white fused alumina, zirconium fused alumina, garnet, corundum, ceramic fused alumina, or diamond), filler comprises 2.5% zinc stearate (the filler can also be calcium carbonate, thallium hydroxide, or aluminum hydroxide), and additives comprise 1.5% titanium dioxide (the additives can also be other pigments, color pastes, anti-settling agents, solubilizers, or grinding aids). The total mass fraction of the above raw materials is 100%. The above slurry raw materials are stirred evenly to prepare a slurry with a viscosity of approximately 6000 cps. Using a two-roll extrusion coating process, 1400 grams of wet adhesive are coated per square meter.

[0076] To accelerate the efficiency of hot gas circulation and increase the curing speed, such as Figures 2-6As shown, the present invention provides a ventilation device 300 for accelerating hot air circulation within the porous winding tube 200 of the above embodiment 3. The ventilation device 300 includes a first cylinder 310 coaxially fixed within the porous winding tube 200, and first air inlets 311 are uniformly opened on the central side of the first cylinder 310. One end of the first cylinder 310 serves as an air inlet 316 for introducing high-speed airflow, and the other end serves as an air outlet 317 for discharging high-speed airflow. According to Bernoulli's principle, due to the high airflow velocity and low pressure within the porous winding tube 200, the gas outside the nonwoven fabric 100 can pass through the winding area of ​​the nonwoven fabric 100 more quickly, increasing the pressure difference inside and outside the porous winding tube 200 and accelerating the hot air circulation speed. Figure 1 As shown, the existing glass fiber pultruded tube winding and curing process can only cure from the outside to the inside of the winding wheel through thermal diffusion, resulting in low curing efficiency. However, by employing a method such as... Figure 2 The curing process shown uses hot air circulation to significantly improve curing efficiency.

[0077] In the above scheme, in order to ensure the improvement of the hot air circulation efficiency, a sealed environment is formed between the first cylinder 310 and the porous winding tube 200, so that the first cylinder 310 can only let out hot air flowing from the outside of the non-woven fabric 100 to the first cylinder 100, and avoid the entry of non-curing gas from both ends of the porous winding tube 200. The ventilation device 300 also includes a self-sealing component, which includes elastic sealing rings 320 sleeved on both ends of the first cylinder 310, and sealing ring group for fixing the elastic sealing rings 320. The inner side of the elastic sealing rings 320 has a thrust slope.

[0078] The sealing ring assembly includes:

[0079] A fixing ring 312 is disposed between the central side of the first cylinder 310 and the end of the first cylinder 310, and is formed by the first cylinder 310 protruding radially outward; and a movable groove 315 is evenly provided along the circumferential direction of the first cylinder 310 between the fixing ring 312 and the end of the first cylinder 310.

[0080] The movable ring 313 is assembled at the end of the first cylinder 310 and forms an annular cavity with the fixed ring 312 to accommodate the elastic sealing ring 320;

[0081] The compression ring 330 is embedded between the elastic sealing ring 320 and the first cylinder 310 and can slide axially within the annular cavity. The outer surface of the compression ring 330 and the thrust inclined surface of the elastic sealing ring 320 form an inclined surface pair.

[0082] A bottomless thrust cylinder 340 is provided inside the air inlet 316. The bottom plate of the thrust cylinder 340 has an air inlet hole 341 along the air inlet direction. A limiting platform 314 is provided on the inner side of the first cylinder 310 corresponding to the thrust cylinder 340, and a return spring 342 is provided between the thrust cylinder 340 and the limiting platform 314.

[0083] A driven cylinder 360 is provided inside the air outlet 317, and the driven cylinder 360 is linked with the thrust cylinder 340;

[0084] The compression ring 330 and the thrust cylinder 340, as well as the compression ring 330 and the driven cylinder 360, are fixedly connected by a connector that passes through the movable groove 315.

[0085] In the above structure, the connecting member through the movable groove 315 is, for example, a screw. Figure 8 As shown, the screw passes through the compression ring 330, moves through the movable groove 315, and connects to the thrust cylinder 340. When the thrust cylinder 340 slides due to the airflow impact at the end of the first cylinder 310, it can synchronously drive the compression ring 330 to move in the annular cavity and compress the thrust slope on the inner side of the elastic sealing ring 320, causing the elastic sealing ring 320 to expand slightly and press against the inner side of the porous winding tube 200. The elastic sealing ring 320 will not come out of the annular cavity, thus forming the required sealing effect.

[0086] In some embodiments of the present invention, in order to further improve the transmission stability between the thrust ramp of the elastic sealing ring 320 and the extrusion ring 330, a metal sheet can be embedded in the thrust ramp inside the elastic sealing ring 320 to ensure that the elastic sealing ring can be extruded.

[0087] Based on the above scheme, in the ventilation device 300 of the present invention, the gas outside the nonwoven fabric 100 can only pass through the nonwoven fabric 100 and enter the porous winding tube 200 under the action of pressure difference, and is discharged through the ventilation device 100. In this process, hot air is formed and carries away the heat of the nonwoven fabric 100, which accelerates its curing process. The magnitude of the pressure difference is controlled according to the airflow speed at the air inlet 316. The hot air discharged through the air outlet 317 can be circulated through the fan, pipe and heat exchange device and other structures (all of which are conventional prior art and will not be described in detail here) and then re-enter the air inlet 316 to form a circulating airflow, thereby reducing costs.

[0088] To fully utilize the internal space of the first cylinder 310 and to link the thrust cylinder 340 and the driven cylinder 360, the ventilation device 300 further includes a second cylinder assembly, which includes:

[0089] Please refer to this carefully. Figure 4 , Figure 6 and Figure 7The second cylinder 350 is coaxially fixed inside the first cylinder 310 and is axially located between the thrust cylinder 340 and the driven cylinder 360. A support plate 354 for fixing the second cylinder 350 is radially and uniformly arranged in the annular space between the second cylinder 350 and the first cylinder 310. A second air vent 355 is provided through the support plate 354 to connect the inner cavity of the second cylinder 350 with the outside of the first cylinder 310. Thus, the second air vent 355 connects the inside of the second cylinder 350 with the inside of the porous winding tube 200.

[0090] A rotating shaft 351 is located on the axis of the second cylinder 350. One end of the rotating shaft 351 extends into the thrust cylinder 340 and is fitted with a turbofan 353 driven by the high-speed airflow from the inlet end 316. The other end of the rotating shaft 351 extends into the driven cylinder 360.

[0091] Several helical blades 352 are evenly spiraled between the rotating shaft 351 and the second cylinder 350; the helical blades 352 can rotate as driven by the turbofan 353 to discharge the airflow inside the second cylinder 350.

[0092] Sleeve 361 is disposed at the center of driven cylinder 360 via radially fixed connecting rod 362, and sleeve 361 is used to rotatably connect the end of rotating shaft 351.

[0093] On the one hand, the rotating shaft 351 and the thrust cylinder 340 can be rotatably connected by bearings, and the rotating shaft 351 and the sleeve 361 can also be rotatably connected by bearings, thereby realizing the linkage between the thrust cylinder 340 and the driven cylinder 360. As an implementation means, both ends of the ventilation device 300 are simultaneously tightly attached to the porous winding tube 200 to form a sealed environment.

[0094] On the other hand, such as Figure 9 As shown, the turbofan 353 is driven by the high-speed airflow from the inlet end 316, causing the spiral blades 352 inside the second cylinder 350 to rotate synchronously. This creates a negative pressure by discharging the gas inside the second cylinder 350, thereby drawing in the hot air between the porous take-up tube 200 and the ventilation device 300 through the second air vent 355. At the same time, the inside of the first cylinder 310 is divided into multiple independent air ducts by the support plate 354, increasing the airflow speed. This comprehensively improves the hot air circulation efficiency, accelerates the curing process of the nonwoven fabric 100, and reduces the curing time to one-third of the original time, while reducing energy consumption to less than 20% of the original time.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for producing a durable nonwoven polished article, the durable nonwoven polished article comprising a fiber nonwoven fabric matrix and a slurry coated on the fiber nonwoven fabric matrix, characterized in that, The slurry includes hard adhesive, soft adhesive, abrasive, filler, and additives, wherein: The hard adhesive is a water-based liquid phenolic resin comprising 5%-20% of the slurry mass, the soft adhesive is at least one of a water-based polyurethane emulsion, a water-based nitrile emulsion, and a water-based acrylic emulsion comprising 10%-40% of the slurry mass, and the abrasive comprises 30%-65% of the slurry mass. Its production method includes the following steps: S1: Prepare the slurry by mixing the hard and soft adhesives evenly according to their mass fractions, and then adding the additives, fillers, and abrasives in sequence to prepare a uniform slurry with a solid content of 60%-90% and a viscosity of 2000-20000cps. S2: Coating slurry. The slurry prepared in S1 is uniformly coated onto the nonwoven fabric substrate by roller coating. The coating amount is 0.9-2.0 kg per square meter. S3: Winding and curing. The coated nonwoven fabric is wound onto a porous winding tube and hot air is circulated through the pores of the porous winding tube for rapid curing. The porous winding tube is equipped with a ventilation device to accelerate the circulation of hot air. The ventilation device includes a first cylinder coaxially fixed in the porous winding tube, and a first air inlet is evenly opened on the central side of the first cylinder. One end of the first cylinder serves as the air inlet to allow high-speed airflow to pass in, and the other end serves as the air outlet to allow high-speed airflow to flow out. The ventilation device also includes a self-sealing component, which includes elastic sealing rings sleeved on both ends of the first cylinder and a sealing ring assembly for fixing the elastic sealing rings. The inner side of the elastic sealing ring has a thrust inclined surface. The sealing ring assembly includes: A fixing ring is disposed between the central side of the first cylinder and the end of the first cylinder, and protrudes radially outward from the first cylinder; and a movable groove is evenly provided along the circumference of the first cylinder between the fixing ring and the end of the first cylinder. A movable ring is assembled at the end of the first cylinder and forms an annular cavity with the fixed ring to accommodate an elastic sealing ring; The extrusion ring is embedded between the elastic sealing ring and the first cylinder and can slide axially within the annular cavity. The outer surface of the extrusion ring and the thrust slope of the elastic sealing ring form a slope pair. A bottomless thrust cylinder is provided inside the air inlet. The bottom plate of the thrust cylinder has an air inlet hole along the air inlet direction. A limiting platform is provided on the inner side of the first cylinder corresponding to the thrust cylinder, and a reset spring is provided between the thrust cylinder and the limiting platform. A driven cylinder is provided inside the air outlet, and the driven cylinder is linked with the thrust cylinder; The extrusion ring and the thrust cylinder, as well as the extrusion ring and the driven cylinder, are fixedly connected by a connecting piece that passes through the movable groove.

2. The method for producing durable nonwoven polished articles according to claim 1, characterized in that, The abrasive includes at least one of silicon carbide, brown fused alumina, white fused alumina, zirconium fused alumina, garnet, corundum, ceramic fused alumina, and diamond.

3. The method for producing durable nonwoven polished articles according to claim 1, characterized in that, The filler is at least one of calcium carbonate, lepidocrocite, and aluminum hydroxide.

4. The method for producing durable nonwoven polished articles according to claim 1, characterized in that, The additive is at least one of pigments, color pastes, antisettling agents, solubilizers, grinding aids, and endothermic agents such as stearic acid.

5. The method for producing a durable nonwoven polished article according to claim 1, characterized in that, The rigid adhesive has a resin solid content of 60-80%, a pH value of 8.0-9.0, a water solubility of 300%-1000%, and a gel time of 50-90 seconds at 130 degrees Celsius.

6. The method for producing a durable nonwoven polished article according to claim 1, characterized in that, The resin solids content of the soft adhesive is 40-60%, its pH value is 8.0-9.0, and its glass transition temperature is -10℃-30℃.

7. The method for producing a durable nonwoven polished article according to claim 1, characterized in that, The ventilation device further includes a second cylinder assembly, the second cylinder assembly comprising: The second cylinder is coaxially fixed inside the first cylinder and is axially located between the thrust cylinder and the driven cylinder; a support plate for fixing the second cylinder is radially and uniformly arranged in the annular space between the second cylinder and the first cylinder, and a second air vent is provided through the support plate to connect the inner cavity of the second cylinder and the outside of the first cylinder. A rotating shaft is located on the axis of the second cylinder. One end of the rotating shaft extends into the thrust cylinder and is fitted with a turbofan driven by the high-speed airflow at the inlet end. The other end of the rotating shaft extends into the driven cylinder. Several helical blades are uniformly spiraled between the rotating shaft and the second cylinder; the helical blades can rotate as driven by the turbofan to exhaust the airflow inside the second cylinder; A sleeve is disposed at the center of the driven cylinder via a radially fixed connecting rod, and the sleeve is used to rotatably connect the end of the rotating shaft.

Images