Preparation method of nano-antibacterial anti-HPV virus hot air non-woven fabric

Abstract

The application discloses a kind of preparation methods of nano antibacterial anti-HPV virus hot air non-woven fabric, it is related to medical health technical field, the application includes the following steps: providing PET particle, PE particle, PE antibacterial master batch, and the quality detection and thermal fusion are carried out to each raw material, and PET / PE double-component fiber is made;The pretreated fiber is treated by high-speed opener, and uniform loose fiber mixture is formed, and is continuously conveyed by fan conveying system;The fiber after opening is formed into a uniform fiber web by carding process;Fiber web is sent into hot air bonding system;The non-woven fabric treated by hot air is cooled and shaped by multi-roll cooling system;The non-woven fabric after shaping is rolled by automatic winding system, and quality inspection and packaging storage are carried out.

Description

Technical Field

[0001] This invention belongs to the field of medical and health technology, and in particular relates to a method for preparing a nano-antibacterial and anti-HPV virus hot air nonwoven fabric. Background Technology

[0002] In existing technologies, nonwoven fabrics, as a widely used material in the medical and hygiene fields, are particularly important for their antibacterial and antiviral properties. However, traditional nonwoven fabric preparation methods often fail to effectively impart durable antibacterial and antiviral properties to the material, especially providing insufficient protection against stubborn viruses such as human papillomavirus (HPV). Many existing antibacterial nonwoven fabrics employ post-processing to add antibacterial agents, but this method suffers from uneven distribution, easy detachment, complex preparation processes, and low efficiency. In the current hot-air nonwoven fabric preparation process, precise process parameter control and real-time quality monitoring are lacking in key stages such as fiber opening, mixing, web forming, and hot-air bonding, resulting in poor product consistency and functional stability. Furthermore, the addition of nano-functional agents in existing technologies often relies on post-processing, leading to uneven distribution and easy detachment. Methods that add functional agents during fiber production often suffer from weak bonding or uneven dispersion between the fiber and functional agent, affecting the durability and uniformity of the final product's functionality. Therefore, we propose a method for preparing nano-antibacterial and anti-HPV virus hot-air nonwoven fabrics. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric, comprising the following steps: Step S1, Raw material preparation and pretreatment: Provide PET particles, PE particles, and PE antibacterial masterbatch, and conduct quality testing and heat fusion on each raw material to make PET / PE bicomponent fibers; Step S2, Fiber Opening and Mixing Conveying: The pretreated fibers are processed by a high-speed opener to form a uniform loose fiber mixture, which is then continuously conveyed by an airflow conveying system; Step S3, Fiber Web Forming and Quality Control: The opened fibers are formed into a uniform fiber web through a carding process; Step S4, Hot air bonding and functional fiber activation: The fiber web is fed into the hot air bonding system and uniformly fixed into the nonwoven fabric structure during the fiber bonding process; Step S5, Cooling and Temperature Control: The nonwoven fabric that has been treated with hot air is cooled and shaped using a cooling system; Step S6, Winding and Finished Product Processing: The shaped nonwoven fabric is wound up by an automatic winding system, and then subjected to quality inspection and packaging storage.

[0004] Furthermore, step S1 includes the following steps: Step S11: The PET particles are polyethylene terephthalate particles; Step S12: The PE particles are polyethylene particles; Step S13: Polyethylene terephthalate particles and polyethylene particles are added to PE antibacterial masterbatch during fiber spinning; Step S14: Premix polyethylene terephthalate particles and low-melting-point polyethylene particles mechanically at a certain weight ratio. The mixing process is required to be carried out in a constant temperature and humidity environment, and the mixing uniformity should reach more than 95%.

[0005] Furthermore, step S2 includes the following steps: Step S21: Feed the premixed fiber into a high-speed opening machine. Set the opening machine speed to 800-1200 rpm, the opening time to 5-10 minutes, and maintain the opening chamber temperature at 25±5℃. Step S22: The opened fiber mixture is smoothly transferred to the web forming machine hopper through a negative pressure airflow conveying device. The airflow velocity in the conveying pipeline is stable at 10-15 m / s, and the relative humidity is 50%-70%. Step S23: During the conveying process, fiber optic sensors are used to monitor the uniformity of the fiber mixture in real time to ensure that the fibers are free of lumps and the distribution uniformity reaches more than 98%.

[0006] Furthermore, step S3 includes the following steps: Step S31: The opened fibers are formed into a uniform fiber web with a basis weight of 20-80 g / m² using an air-flow web forming machine. The web forming machine speed is 2-5 m / min. Step S32: The working wind speed of the web forming machine is controlled at 5-8 m / s, and the width of the fiber web is adjusted to 1.5-4.5 meters according to production requirements, with a width deviation of ±0.5%. Step S33: Use a high-precision online beta-ray thickness gauge to continuously monitor the thickness of the fiber web in real time, with a monitoring frequency of 100 times per second; Step S34: Control the fiber distribution through an automatic feedback adjustment system and use a PID algorithm to adjust the fan speed in real time. The thickness deviation of the fiber web is ±5% across the entire width.

[0007] Furthermore, step S4 includes the following steps: Step S41: The hot air bonding temperature is controlled independently in two zones: the temperature of the first zone is 100-130℃, and the temperature of the second zone is 130-160℃. Step S42: The hot air velocity is controlled within the range of 2-5 m / s by a variable frequency fan, and the relative humidity inside the hot air cavity is maintained at 40-60% by a steam injection system.

[0008] Furthermore, step S5 includes the following steps: Step S51: A progressive cooling system is adopted, and the surface temperature of the cooling roller is controlled by a PLC; Step S52: The nonwoven fabric passes through the cooling roller system at a speed of 5-10 m / min, with speed fluctuations controlled within ±0.2 m / min; Step S53: Monitor the surface temperature of the nonwoven fabric in real time using a non-contact infrared thermometer with a measurement accuracy of ±0.5℃ to ensure cooling to the target temperature of 20-25℃.

[0009] Furthermore, step S6 includes the following steps: Step S61: The winding tension is controlled within the range of 10-20N by a closed-loop system consisting of a servo motor and a tension sensor; Step S62: Use a machine vision system to inspect the surface quality of the roll of nonwoven fabric, with an inspection accuracy of 0.1 mm². Step S63: Store the qualified nonwoven fabric rolls in a constant temperature and humidity environment of 20-25℃ and 45%-60% relative humidity; and record the environmental parameters every hour.

[0010] The present invention has the following beneficial effects: 1. This invention uses prefunctionalized fibers as raw materials, achieving uniform addition and fixation of antibacterial agents during the fiber production stage, avoiding uneven distribution and easy detachment problems that may occur in subsequent processes. The functional components are further activated through a hot air bonding process, firmly binding them to the fiber structure and endowing the nonwoven fabric with long-lasting and stable antibacterial and anti-HPV virus properties. This provides the nonwoven fabric with durable and highly effective antibacterial and anti-HPV virus properties, improving the product's functional stability and service life, and preventing functional agent loss.

[0011] 2. This invention introduces a multi-stage precise process parameter control and real-time quality monitoring system throughout the entire preparation process. For example, in key steps such as fiber opening, web formation, hot air bonding, and cooling and shaping, fiber optic sensors, online beta-ray thickness gauges, and automatic feedback adjustment systems are used to monitor parameters such as fiber uniformity, web thickness, temperature, and humidity in real time. Furthermore, by dynamically adjusting fan speed and temperature, stable process conditions are ensured. This precise control improves the product consistency and functional stability of the nonwoven fabric, avoiding quality defects caused by parameter fluctuations in traditional methods.

[0012] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic flowchart of a method for preparing a nano-antibacterial and anti-HPV virus hot air nonwoven fabric according to the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figure 1 As shown, this invention discloses a method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric, comprising the following steps: Step S1, Raw material preparation and pretreatment: Provide PET particles, PE particles, and PE antibacterial masterbatch, and conduct quality testing and heat fusion on each raw material to make PET / PE bicomponent fibers; Step S2, Fiber Opening and Mixing Conveying: The pretreated fibers are processed by a high-speed opener to form a uniform loose fiber mixture, which is then continuously conveyed by an airflow conveying system; Step S3, Fiber Web Forming and Quality Control: The opened fibers are formed into a uniform fiber web through an airflow web forming process; Step S4, Hot air bonding and functional fiber activation: The fiber web is fed into the hot air bonding system and uniformly fixed into the nonwoven fabric structure during the fiber bonding process; Step S5, Cooling and Temperature Control: The nonwoven fabric treated with hot air is cooled and shaped using a multi-roller cooling system; Step S6, Winding and Finished Product Processing: The shaped nonwoven fabric is wound up by an automatic winding system, and then subjected to quality inspection and packaging storage.

[0017] Step S1 includes the following steps: Step S11: The PET particles are polyethylene terephthalate; Step S12: The PE particles are polyethylene; Step S13: Polyethylene terephthalate particles and polyethylene particles are added to PE antibacterial masterbatch during fiber spinning; Step S14: Premix polyethylene terephthalate particles and low-melting-point polyethylene particles mechanically at a certain weight ratio. The mixing process is required to be carried out in a constant temperature and humidity environment, and the mixing uniformity should reach more than 95%.

[0018] Step S2 includes the following steps: Step S21: Feed the premixed fiber into a high-speed opening machine. Set the opening machine speed to 800-1200 rpm, the opening time to 5-10 minutes, and maintain the opening chamber temperature at 25±5℃. Step S22: The opened fiber mixture is smoothly transferred to the web forming machine hopper through a negative pressure airflow conveying device. The airflow velocity in the conveying pipeline is stable at 10-15 m / s, and the relative humidity is 50%-70%. Step S23: During the conveying process, fiber optic sensors are used to monitor the uniformity of the fiber mixture in real time to ensure that the fibers are free of lumps and the distribution uniformity reaches more than 98%.

[0019] Step S3 includes the following steps: Step S31: The opened fibers are formed into a uniform fiber web with a basis weight of 20-80 g / m² using an air-flow web forming machine. The web forming machine speed is 2-5 m / min. Step S32: The working wind speed of the web forming machine is controlled at 5-8 m / s, and the width of the fiber web is adjusted to 1.6-2.0 meters according to production requirements, with a width deviation of ±0.5%. Step S33: Use a high-precision online beta-ray thickness gauge to continuously monitor the thickness of the fiber web in real time, with a monitoring frequency of 100 times per second; Step S34: Control the fiber distribution through an automatic feedback adjustment system and use a PID algorithm to adjust the fan speed in real time. The thickness deviation of the fiber web is ±5% across the entire width.

[0020] Step S4 includes the following steps: Step S41: The hot air bonding temperature is controlled independently in two zones: the temperature of the first zone is 100-130℃, and the temperature of the second zone is 130-160℃. Step S42: The hot air velocity is controlled within the range of 2-5 m / s by a variable frequency fan, and the relative humidity inside the hot air cavity is maintained at 40-60% by a steam injection system.

[0021] Step S5 includes the following steps: Step S51: A cooling system is used, and the surface temperature of the cooling roller is controlled by a PLC; Step S52: The nonwoven fabric passes through the cooling roller system at a speed of 5-10 m / min, with speed fluctuations controlled within ±0.2 m / min; Step S53: Monitor the surface temperature of the nonwoven fabric in real time using a non-contact infrared thermometer with a measurement accuracy of ±0.5℃ to ensure cooling to the target temperature of 20-25℃.

[0022] Step S6 includes the following steps: Step S61: The winding tension is controlled within the range of 10-20N by a closed-loop system consisting of a servo motor and a tension sensor; Step S62: Use a machine vision system to inspect the surface quality of the roll of nonwoven fabric, with an inspection accuracy of 0.1 mm². Step S63: Store the qualified nonwoven fabric rolls in a constant temperature and humidity environment of 20-25℃ and 45%-60% relative humidity; and record the environmental parameters every hour.

[0023] One specific application of this embodiment is: Step 1: Raw material preparation and pretreatment 1. Raw material selection and specification confirmation: Main fiber: Polyethylene terephthalate particles with smooth and impurity-free surfaces are selected. The antibacterial components are added in the form of masterbatch or blend during the fiber spinning process to ensure that the nanoparticles are evenly distributed inside the fiber.

[0024] Adhesive fiber: Low-melting-point polyethylene particles are selected to ensure adhesive stability.

[0025] Nanoparticle antibacterial and antiviral agent: Prepare nanoparticles with a particle size controlled at 20-30 nm and a mass percentage concentration of 1%-10%; simultaneously add sodium polyacrylate at a mass percentage concentration of 0.3% as a dispersing stabilizer, and stir with a magnetic stirrer at 800 rpm for 30 minutes to ensure uniform dispersion of nanoparticles without agglomeration.

[0026] 2. Raw material premixing: Polyethylene terephthalate particles and low-melting-point polyethylene particles were added to a constant temperature and humidity mixer at a certain weight ratio. The mixing environment was set to 25°C and 60% relative humidity. The mixture was stirred in a spiral manner for 20 minutes. The uniformity of the mixture was confirmed to be 96% by sampling and testing. The mixture was then set aside for later use.

[0027] Step 2: Fiber opening and mixing conveying 1. Fiber opening treatment: The premixed fibers are fed into a high-speed opening machine. The opening machine speed is set to 1000 rpm and the opening time is 8 minutes. The temperature of the opening chamber is maintained at 25°C by a constant temperature system to ensure that the fibers are fully loosened without excessive damage.

[0028] 2. Mixed fiber transport and monitoring: After opening, the fiber mixture is transferred to the web forming machine hopper through a negative pressure airflow conveying device. The airflow speed in the conveying pipeline is adjusted to be stable at 12m / s, and the relative humidity in the pipeline is maintained at 60% by a humidity control system. At the same time, an optical fiber sensor is installed in the middle section of the conveying pipeline to monitor the dispersion state of the fiber mixture in real time and record data every 30 seconds to ensure that the fibers are not clumped. Finally, the fiber distribution uniformity is tested to reach 98.5%.

[0029] Step 3: Fiber Web Forming and Quality Control 1. Fiber web forming parameter settings: The loose fiber mixture is fed into a carding machine, and the machine parameters are set as follows: target weight 40g / m², screen speed 3.5m / min, and working air speed 6.5m / s. The width is adjusted to 2.5 meters according to product requirements, and the width deviation is controlled to ±0.4% by the width positioning device.

[0030] 2. Real-time quality monitoring and adjustment: A high-precision online beta-ray thickness gauge is installed at the outlet of the web forming machine, with a monitoring frequency of 100 times per second to collect web thickness data in real time. The data is transmitted to the PLC controller through an automatic feedback adjustment system, and the speed of the web forming machine fan is adjusted in real time using a PID algorithm. Ultimately, the web thickness deviation within the full width is controlled to be ±4.2%, ensuring a uniform web structure.

[0031] Step 4: Hot air bonding 1. Hot air bonding system parameter settings: The formed fiber web is fed into the hot air bonding system, which adopts a two-zone independent temperature control mode: the temperature of the first zone is set at 125℃ and the temperature of the second zone is 135℃. The temperature is monitored in real time by a platinum resistance temperature sensor to control the temperature deviation of each zone to ≤±1.5℃; the hot air speed is set at 3.5m / s, and the relative humidity in the hot air chamber is maintained at 50% by a steam jet system. 2. Prefunctionalized composite fibers are used, in which antibacterial nanoparticle masterbatch has been added during the production process. The nanoparticles have a particle size of 10-50 nanometers and are uniformly distributed throughout the fiber. During the hot air bonding process, the fiber is heated, which further stabilizes the antibacterial components on the fiber surface and inside the fiber.

[0032] Step 5: Cooling and Shaping, and Temperature Control 1. Cooling system parameter settings: A three-roll progressive cooling system is adopted, and the surface temperature of each cooling roller is set by a PLC controller: 28℃ for the first roller, 24℃ for the second roller, and 22℃ for the third roller; the speed of the nonwoven fabric passing through the cooling roller is set to 7m / min, and the speed fluctuation is controlled by a variable frequency motor to be ≤±0.15m / min.

[0033] 2. Cooling effect monitoring: A non-contact infrared thermometer is installed at the outlet of the third cooling roller, with a temperature measurement accuracy set to ±0.5℃, to monitor the surface temperature of the nonwoven fabric in real time. The temperature of the cooling roller is finely adjusted through a feedback adjustment system to ensure that the nonwoven fabric is cooled to 22-24℃, thus avoiding wrinkles or performance fluctuations caused by uneven cooling.

[0034] Step Six: Winding and Finished Product Processing 1. Automatic winding control: The cooled and shaped nonwoven fabric is fed into an automatic winding system. The winding tension is set to 15N through a closed-loop system consisting of a servo motor and a tension sensor. During the winding process, the tension change is monitored in real time, and the response time is adjusted to ≤0.5 seconds to ensure that the edges of the roll are neat and free from stretching deformation.

[0035] 2. Quality Inspection and Storage Surface quality inspection: A machine vision system is used to inspect the entire width of the roll of nonwoven fabric. The inspection accuracy reaches 0.1mm², and it can identify defects such as broken filaments, holes, and impurities. In this embodiment, the inspection pass rate is 99.2%.

[0036] Environmental storage: The qualified non-woven fabric rolls are transferred to a constant temperature and humidity warehouse. The storage temperature is set at 23℃ and the relative humidity at 55%. The environmental parameters are recorded every hour by a temperature and humidity recorder. There is no moisture absorption or mold growth during the storage period.

[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric, characterized in that: Includes the following steps: Step S1, Raw material preparation and pretreatment: Provide PET particles, PE particles, and PE antibacterial masterbatch, and conduct quality testing and heat fusion on each raw material to make PET / PE bicomponent fibers; Step S2, Fiber Opening and Mixing Conveying: The pretreated fibers are processed by a high-speed opener to form a uniform loose fiber mixture, which is then continuously conveyed by a fan conveying system; Step S3, Fiber Web Forming and Quality Control: The opened fibers are formed into a uniform fiber web through a carding process; Step S4, Hot air bonding and functional fiber activation: The fiber web is fed into the hot air bonding system and uniformly fixed into the nonwoven fabric structure during the fiber bonding process; Step S5, Cooling and Temperature Control: The nonwoven fabric treated with hot air is cooled and shaped using a multi-roller cooling system; Step S6, Winding and Finished Product Processing: The shaped nonwoven fabric is wound up by an automatic winding system, and then subjected to quality inspection and packaging storage.

2. The method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric according to claim 1, characterized in that, Step S1 includes the following steps: Step S11: The PET particles are polyethylene terephthalate particles; Step S12: The PE particles are polyethylene particles; Step S13: Polyethylene terephthalate particles and polyethylene particles are added to PE antibacterial masterbatch during fiber spinning; Step S14: Premix polyethylene terephthalate particles and low-melting-point polyethylene particles mechanically at a certain weight ratio. The mixing process is required to be carried out in a constant temperature and humidity environment, and the mixing uniformity should reach more than 95%.

3. The method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric according to claim 1, characterized in that, Step S2 includes the following steps: Step S21: Feed the premixed fiber into a high-speed opening machine. Set the opening machine speed to 800-1200 rpm, the opening time to 5-10 minutes, and maintain the opening chamber temperature at 25±5℃. Step S22: The opened fiber mixture is smoothly transferred to the web forming machine hopper through a negative pressure airflow conveying device. The airflow velocity in the conveying pipeline is stable at 10-15 m / s, and the relative humidity is 50%-70%. Step S23: During the conveying process, fiber optic sensors are used to monitor the uniformity of the fiber mixture in real time to ensure that the fibers are free of lumps and the distribution uniformity reaches more than 98%.

4. The method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric according to claim 1, characterized in that, Step S3 includes the following steps: Step S31: The opened fibers are formed into a uniform fiber web with a basis weight of 20-80 g / m² by a carding and web forming machine; Step S32: Adjust the width of the fiber web to 1.5-4.5 meters according to production requirements, with a width deviation of ±0.5%; Step S33: Use a high-precision online beta-ray thickness gauge to continuously monitor the thickness of the fiber web in real time, with a monitoring frequency of 100 times per second; Step S34: Control the fiber distribution through an automatic feedback adjustment system and use a PID algorithm to adjust the fan speed in real time. The thickness deviation of the fiber web is ±5% across the entire width.

5. The method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric according to claim 1, characterized in that, Step S4 includes the following steps: Step S41: The hot air bonding temperature is controlled independently in two zones. The temperature of the first zone is 100-130℃, and the temperature of the second zone is 130-160℃. The temperature deviation of each zone is controlled within ±2℃. Step S42: The hot air velocity is controlled within the range of 2-5 m / s by a variable frequency fan, and the relative humidity inside the hot air cavity is maintained at 40-60% by a steam injection system.

6. The method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric according to claim 1, characterized in that, Step S5 includes the following steps: Step S51: A cooling system is adopted, and the surface temperature of the cooling roller is controlled by a PLC; Step S52: The nonwoven fabric passes through the cooling roller system at a certain speed, with speed fluctuation controlled within ±0.2m / min; Step S53: Monitor the surface temperature of the nonwoven fabric in real time using a non-contact infrared thermometer with a measurement accuracy of ±0.5℃ to ensure cooling to the target temperature of 20-25℃.

7. The method for preparing a nano-antibacterial and anti-HPV virus hot-air nonwoven fabric according to claim 1, characterized in that, Step S6 includes the following steps: Step S61: The winding tension is controlled within the range of 10-20N by a closed-loop system consisting of a servo motor and a tension sensor; Step S62: Use a machine vision system to inspect the surface quality of the roll of nonwoven fabric, with an inspection accuracy of 0.1 mm². Step S63: Store the qualified nonwoven fabric rolls in a constant temperature and humidity environment of 20-25℃ and 45%-60% relative humidity; and record the environmental parameters every hour.

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