Method for optimizing the properties of a low-temperature enzyme-based sand-washed antibacterial modal blend fabric

Abstract

The application discloses a low-temperature enzyme-based sand washing antibacterial modal blended fabric performance optimization method, and aims to solve the contradiction between the flexible protection of the fiber hydrolysis fragile period and the high physical energy penetration of the antibacterial dyeing period in the existing one-bath process.The method comprises the following steps: after adding the enzyme and the temperature-sensitive antibacterial agent, maintaining the first temperature, the first water level and low-frequency operation; monitoring the bath turbidity in real time during the operation, and if the threshold value is exceeded, injecting cold water to reduce the temperature and further reduce the frequency to prevent damage; then, increasing the mechanical operation frequency in proportion and reducing to the second water level during the temperature rising to the second temperature interval for the antibacterial agent activation and release; adding the dye after reaching the target temperature, and increasing to the rated operation frequency to complete the treatment.The application dynamically matches the temperature and the fluid physical field and establishes a closed-loop damage prevention mechanism, so that the mechanical damage risk of the modal fiber in the fragile period can be effectively reduced while ensuring the deep penetration and the long-acting anchoring of the antibacterial agent.

Description

Technical Field

[0001] This invention relates to the field of fabric treatment technology, specifically to a method for optimizing the performance of sand-washed antibacterial modal blended fabrics based on low-temperature enzymes. Background Technology

[0002] Modal blended fabrics are widely used in high-end apparel due to their excellent drape and soft touch. The industry often uses bio-enzymes for sand washing to achieve a unique peach-skin texture. To achieve energy conservation and emission reduction in the dyeing process and increase the added value of the fabric, the industry is currently trending towards combining enzyme sand washing, functional antibacterial treatment, and dyeing processes in the same bath. However, there is an irreconcilable conflict between the low-stress flexibility protection of Modal fibers during their hydrolytic vulnerability period and the high physical kinetic energy penetration during the antibacterial dyeing period.

[0003] Specifically, Modal, as a regenerated cellulose fiber, is highly susceptible to swelling of its amorphous regions in a water bath, leading to a sharp decrease in wet strength. During the high-activity hydrolysis stage of low-temperature enzymes, the fiber surface is in an extremely fragile state due to micro-etching, making it highly sensitive to mechanical friction and fluid impact. Simultaneously, due to differences in fabric batches and previous weaving stress, the fiber's reaction rate to enzymes is difficult to predict, and sudden shedding of short fibers is highly likely within a normal processing cycle. Conversely, in the subsequent antibacterial and dyeing stages, the activation of antibacterial agents and the deep anchoring of dye macromolecules rely on higher bath temperatures and strong mechanical kinetic energy to ensure that the active ingredients can penetrate into the fiber interior.

[0004] Existing sand washing or dyeing equipment and process control typically rely on preset static time curves and operate with constant mechanical parameters (such as fixed main circulation pump head and fabric lifting roller speed). This traditional constant parameter control mode cannot simultaneously address the conflicting needs of different reaction stages in the same bath system: maintaining low temperature and low mechanical force throughout the process results in extremely poor dye penetration and low water resistance of antibacterial agents; while using high temperature and strong mechanical force, the intense fluid jet impact superimposed on the fragile Modal fibers inevitably leads to irreversible rigid tearing and strength damage to the fibers.

[0005] Therefore, how to solve the problem of mechanical damage to modal fibers during their vulnerable period while ensuring deep dyeing and long-term anchoring of antibacterial agents is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] To address at least one of the technical deficiencies mentioned in the background art, the present invention aims to provide a method for optimizing the performance of sand-washed antibacterial modal blended fabrics based on low-temperature enzymes, the method comprising: Step 1: Add modal blended fabric, enzymes and temperature-sensitive antibacterial agent to the bath liquid. The centralized control system maintains the bath liquid temperature in the first temperature range. At the same time, open the water inlet valve to set the bath liquid to the first water level, and control the main circulation pump and fabric lifting roller to operate at a first frequency lower than the rated operating frequency of the equipment. Step 2: During the operation of maintaining the first temperature range, when it is determined that the turbidity data of the bath liquid collected in real time by the sensor is higher than the preset turbidity threshold, the centralized control system injects cold water to reduce the temperature of the bath liquid to below the first temperature range, and controls the main circulation pump and the fabric lifting roller to operate at a second frequency lower than the first frequency. Step 3: When the above-mentioned operation in the first temperature range reaches the preset time, or after the above-mentioned operation of injecting cold water to cool down is performed, the centralized control system controls the bath liquid to rise from the current temperature to the second temperature range, which is higher than the first temperature range and is the activation and release temperature of the temperature-sensitive antibacterial agent; during the heating period, the centralized control system controls the operating frequency of the main circulation pump and the cloth lifting roller to increase proportionally with the rise of the bath liquid temperature, and opens the drain valve to lower the bath liquid to the second water level, which is lower than the first water level; Step 4: When the bath temperature reaches the second temperature range, add dye to the bath. The central control system controls the main circulation pump and the fabric lifting roller to rise to the rated operating frequency, and maintains the second temperature range and the rated operating frequency until the preset bath treatment time ends.

[0007] Optionally, the enzyme is acidic cellulase, and the thermosensitive antibacterial agent is a microcapsule antibacterial agent with thermal response properties in the wall material.

[0008] Optionally, the first temperature range is 45℃-55℃, and the second temperature range is 75℃-85℃.

[0009] Optionally, the rated operating frequency of the device is 50Hz, the first frequency is 30Hz-35Hz, and the second frequency is 15Hz-20Hz.

[0010] Optionally, if the cold water injection cooling operation has been performed in step 2, then before the central control system controls the operating frequency of the main circulation pump and the fabric lifting roller to increase proportionally with the rise in bath liquid temperature, and before opening the drain valve to lower the bath liquid to a second water level below the first water level, the method further includes: Step 31: While maintaining the first water level, the centralized control system decouples the synchronous linkage between the main circulation pump and the fabric lifting roller, and executes a preset number of alternating delinting cycles; wherein a single delinting cycle includes: Control the fabric lifting roller to reduce its frequency to a dwell frequency lower than the second frequency, and simultaneously control the main circulation pump to output an instantaneous jet pulse higher than the rated operating frequency, so that the fabric is in a tension-free stacked and swollen state in the bath liquid; then, control the main circulation pump to reduce its frequency to a frequency lower than the second frequency, and simultaneously control the fabric lifting roller to increase its frequency to a frequency higher than the first frequency, so that the fabric is stretched and tensioned. Step 32: After completing the preset number of deflossing cycles, the centralized control system, while keeping the fabric in the stretched tension state, opens the drain valve to lower the bath liquid to the second water level, then controls the main circulation pump and the fabric lifting roller to resume synchronous linkage, and executes the operation of increasing the operating frequency proportionally with the rise of the bath liquid temperature.

[0011] Optionally, the centralized control system controls the operating frequency of the main circulation pump and the fabric lifting roller to increase proportionally with the rise in bath temperature, including: Step 33: The centralized control system controls the operating frequency of the main circulation pump and the fabric lifting roller to initially increase as the bath temperature rises using the built-in reference proportional curve, and collects the output torque current value of the fabric lifting roller drive motor in real time; during the process of heating to the second temperature range, the real-time change rate of the output torque current value with respect to time is calculated. Step 34: When the real-time change rate shows a negative sudden change and is lower than the preset lubrication drop threshold, it is determined that the temperature-sensitive antibacterial agent in the bath liquid has entered the wall material softening phase. The centralized control system triggers the first dynamic correction, adjusts the frequency increase ratio coefficient of the main circulation pump to a level lower than the reference ratio curve, and simultaneously adds the slip compensation frequency to the fabric lifting roller to eliminate fabric slippage. Step 35: As the temperature continues to rise, when the real-time rate of change changes from negative to positive and crosses zero, it is determined that the temperature-sensitive antibacterial agent has entered the release phase. The centralized control system triggers the second dynamic correction, adjusting the frequency increase ratio coefficient of the main circulation pump to a level higher than the reference ratio curve. The increasing hydraulic impulse is used to allow the antibacterial agent in the release phase to penetrate into the fabric until the bath temperature reaches the second temperature range, at which point the reference ratio is restored and the rated operating frequency is reached.

[0012] Optionally, the bath ratio corresponding to the first water level is 1:8 to 1:12, and the bath ratio corresponding to the second water level is 1:5 to 1:7.

[0013] Optionally, the turbidity data of the bath liquid can be obtained by a photoelectric turbidity sensor installed on the dye bath return pipeline of the equipment.

[0014] Optionally, when the centralized control system controls the bath liquid to rise from the current temperature to the second temperature range, the heating rate is controlled at 1.0℃ / min-2.0℃ / min.

[0015] Optionally, after the preset bath treatment time is completed, the process further includes: cooling and discharging the bath liquid, and sequentially performing conventional warm water washing, neutralization, dehydration and drying treatments on the fabric.

[0016] Compared with existing technologies, this invention precisely blocks over-etching and mechanical damage to modal fibers by maintaining a primary water level and low-frequency operation during the initial enzyme addition phase and employing a cold water frequency reduction and melting method based on turbidity monitoring. Simultaneously, during the process of raising the activation temperature of the temperature-sensitive antibacterial agent, by synchronously lowering the water level and proportionally increasing the mechanical operating frequency, a dynamic and precise match between the fluid physical field and the biochemical reaction sequence can be achieved. Furthermore, this invention provides high-order physical kinetic energy to ensure deep dye penetration and long-term anchoring of antibacterial components while maximizing the preservation of the fabric's physical strength, achieving a high degree of unity between sand washing damage prevention, long-term antibacterial effect, and deep dyeing in modal blended fabrics. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main process of a method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes, as disclosed in an embodiment of the present invention. Figure 2 This is a partial flowchart of step 2 disclosed in an embodiment of the present invention; Figure 3 This is a schematic diagram of the processing flow for a single delinting cycle disclosed in an embodiment of the present invention. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] To facilitate understanding of the implementation environment and control logic of this invention, the hardware devices and centralized control system involved in this application will be described as follows.

[0020] The method described in this application relies on a dyeing and printing equipment system with multi-parameter coordinated control function, which mainly includes the following core components: Centralized Control System: The centralized control system is the core control hub of this invention, and a programmable logic controller (PLC) can be used as the main control unit. This system is used to receive real-time data from various sensors (such as temperature sensors, turbidity sensors, and torque feedback modules) and automatically adjust the execution components of the equipment (such as heating devices, inlet valves, drain valves, and frequency converters) according to preset process logic.

[0021] Main circulation pump: The main circulation pump is the power source for forced circulation of the bath liquid and jet impact, and it is equipped with a variable frequency drive. In this application, the operating frequency of the main circulation pump directly determines the size of the bath liquid circulation flow rate and the mechanical kinetic energy of the fluid impacting the fabric. The centralized control system can achieve a wide range of adjustment from low-frequency gentle circulation (first frequency, second frequency) to high-frequency strong jet pulse (instantaneously higher than the rated frequency) by changing its frequency, thereby providing low-stress protection during the fabric's vulnerable period and providing the high-order physical kinetic energy required for deep penetration during the dyeing and antibacterial anchoring periods.

[0022] Fabric lifting roller: The fabric lifting roller is the traction mechanism for the fabric to circulate within the equipment's bath, and it is also equipped with an independent frequency converter driver. Its operating frequency determines the fabric's travel speed and the mechanical tension it experiences. In this application, the fabric lifting roller and the main circulation pump can be in a synchronous linkage state (i.e., their frequencies change synchronously proportionally) or a decoupled state (i.e., their frequencies are controlled independently and do not interfere with each other). During the delinting cycle, by decoupling the two, the reduced frequency of the fabric lifting roller and the pulse output of the main circulation pump work together to allow the fabric to alternate between a tension-free stacking and swelling state and a stretched and tensioned state, thereby achieving effective removal of short fibers.

[0023] Photoelectric turbidity sensor: Installed in the dye bath return pipeline of the equipment, the photoelectric turbidity sensor is used for online real-time monitoring of turbidity changes caused by suspended particulate matter such as free short fibers and impurities in the bath. This sensor operates based on the principle of light transmission or light scattering, and the collected turbidity data is uploaded to the centralized control system in real time. The centralized control system determines whether the enzyme hydrolysis reaction is progressing excessively based on whether the data exceeds a preset turbidity threshold, thereby triggering a circuit breaker.

[0024] Water level control system (inlet valve and outlet valve): The water level control system consists of an inlet valve and an outlet valve controlled by a centralized control system. It is used to precisely adjust the total amount of bath liquid in the equipment, thereby controlling the bath ratio (i.e., the ratio of fabric weight to bath liquid volume). In this application, the water level is set as a first water level (high water level, corresponding to a large bath ratio, providing sufficient circulation space) and a second water level (low water level, corresponding to a small bath ratio, improving the concentration gradient of effective ingredients and mass transfer driving force). By switching between high and low water levels, combined with different mechanical frequencies, secondary regulation of the fluid physical field is achieved.

[0025] Temperature control system: The temperature control system includes a heating device (such as a steam heating pipe or an electric heater) and a cooling water injection device. The centralized control system uses control algorithms such as PID to precisely maintain the bath solution in the first temperature range (low temperature range) required for enzyme hydrolysis, and can quickly inject cold water to deactivate and put the enzyme into dormancy when over-etching and melting are triggered; subsequently, in the heating phase, the bath solution is precisely raised to the second temperature range (high temperature range) required for the activation and staining of the temperature-sensitive antibacterial agent at a set heating rate.

[0026] Reference Figure 1As shown, this embodiment of the invention provides a method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes. The method includes the following steps: Step 1: Add modal blended fabric, enzymes and temperature-sensitive antibacterial agent to the bath liquid. The centralized control system maintains the bath liquid temperature in the first temperature range. At the same time, open the water inlet valve to set the bath liquid to the first water level, and control the main circulation pump and fabric lifting roller to operate at a first frequency lower than the rated operating frequency of the equipment. In this embodiment, modal blended fabric, enzymes, and a temperature-sensitive antibacterial agent are fed into a dyeing and printing equipment equipped with the aforementioned centralized control system. The specific batch size of the fabric can be adjusted according to the equipment capacity, and this embodiment does not limit this. The volume of the bath solution and the amount of auxiliaries can be adjusted proportionally according to the actual equipment capacity and fabric weight. The core control logic of this invention does not change due to different batch sizes.

[0027] Specifically, the enzyme can be a commercially available acidic cellulase product, which has suitable hydrolytic activity in the temperature range of 45℃-55℃; the thermosensitive antibacterial agent is preferably a microcapsule antibacterial agent with a wall material that has thermal response characteristics, such as microcapsules with poly(N-isopropylacrylamide) or its copolymers as the wall material, whose phase transition temperature can be adjusted to the range of 75℃-85℃ according to the wall material composition. Acidic cellulase can controllably hydrolyze and etch the microcilia on the surface of modal fibers under low-temperature conditions to form the peach-skin texture required for sand washing; while the thermal response characteristics of the wall material of the microcapsule antibacterial agent ensure that its activation and release temperature is higher than the optimal working temperature range of the enzyme, thereby ensuring that the antibacterial agent is not released prematurely during the enzyme hydrolysis stage, thus preventing the loss of effective components.

[0028] The centralized control system opens the water inlet valve, setting the bath liquid to the first water level. The preferred bath ratio for this first water level is 1:8 to 1:12, for example, it can be set to 1:10. It should be noted that within this bath ratio range, the bath liquid has ample circulation space, which is beneficial for maintaining a uniform distribution of bath liquid concentration and temperature under low-frequency operating conditions. Simultaneously, it provides sufficient buffer volume for the fabric, preventing excessive accumulation and compression of the fabric within the equipment.

[0029] Simultaneously, the centralized control system activates the temperature control system, raising and maintaining the bath temperature to and within the first temperature range. The first temperature range is preferably 45℃-55℃, for example, it can be set to 50℃. It should be noted that this temperature range is the suitable temperature window for acidic cellulase to exert its highly active hydrolytic effect, ensuring the uniformity and controllability of the sand washing and etching effect.

[0030] The centralized control system further controls the main circulation pump and the fabric lifting roller to operate synchronously at a first frequency lower than the equipment's rated operating frequency. The equipment's rated operating frequency is 50Hz, and the first frequency is 30Hz-35Hz, for example, it can be set to 35Hz.

[0031] It should be noted that Modal, as a regenerated cellulose fiber, is highly susceptible to swelling in its amorphous regions during the wet state and early stages of enzymatic hydrolysis, leading to a sharp decrease in wet strength. At this point, the fiber is extremely sensitive to mechanical friction and fluid impact. If conventional high-frequency operation is used, the combined effect of strong fluid jets and mechanical traction on the fiber during its vulnerable phase inevitably causes irreversible tearing and strength damage. If the temperature is too low, enzyme activity will be insufficient, and the sand washing effect will not meet expectations; if the temperature is too high, the enzymatic hydrolysis will be too strong, and the etching rate of the fiber surface will run out of control, also leading to excessive strength damage.

[0032] This step uses a centralized control system to precisely maintain the bath temperature within the suitable enzymatic hydrolysis range of 45℃-55℃, and controls the main circulation pump and fabric lifting roller to operate at a first frequency of 30Hz-35Hz (significantly lower than the equipment's rated operating frequency of 50Hz), effectively reducing fluid impact and mechanical traction. Simultaneously, the first water level, corresponding to a large bath ratio of 1:8 to 1:12, provides ample space for bath circulation, ensuring uniform distribution of bath concentration and temperature even under low-frequency operation, avoiding fabric treatment differences caused by localized uneven concentration. Therefore, through this synergistic control, this step, while ensuring enzyme hydrolysis activity and sand washing uniformity, provides sufficient low-stress flexibility protection for the fibers, effectively preventing irreversible damage to the fibers during the hydrolysis vulnerable period due to excessive mechanical action.

[0033] Step 2: During the operation of maintaining the first temperature range, when it is determined that the turbidity data of the bath liquid collected in real time by the sensor is higher than the preset turbidity threshold, the centralized control system injects cold water to reduce the temperature of the bath liquid to below the first temperature range, and controls the main circulation pump and the fabric lifting roller to operate at a second frequency lower than the first frequency. In this embodiment, a photoelectric turbidity sensor installed on the dye bath return pipeline of the equipment acquires the turbidity data of the bath liquid in real time. The photoelectric turbidity sensor operates based on the principle of light transmission or light scattering, and can sensitively detect changes in the concentration of free short fibers and suspended particulate matter in the bath liquid caused by the shedding of microfibrils from the fiber surface. The turbidity data collected by the sensor is uploaded to the centralized control system in real time in the form of analog or digital signals.

[0034] As enzymatic hydrolysis continues in step 1, the microfibrils on the fabric surface are continuously hydrolyzed and shed by acidic cellulase, and the concentration of free short fibers in the bath gradually increases, resulting in a corresponding upward trend in turbidity data. The centralized control system compares the real-time turbidity data with a preset turbidity threshold. This preset turbidity threshold can be pre-calibrated based on the fabric type, enzyme dosage, and process requirements; it indicates that the degree of fiber etching has reached a critical state.

[0035] When the turbidity data of the bath solution is determined to be higher than the preset turbidity threshold, the circuit breaker protection is triggered, and the following operations are performed: The centralized control system activates the water injection cooling device, injecting cold water into the bath liquid to rapidly lower the temperature of the bath liquid below the first temperature range. When the temperature drops below 45°C (for example, to 40°C), the activity of acid cellulase is significantly inhibited or even enters a dormant state, thereby chemically terminating the excessive hydrolysis and etching of the fiber surface and avoiding excessive weight loss and severe damage to strength.

[0036] The centralized control system synchronously controls the main circulation pump and the fabric lifting roller, further reducing their operating frequency from the first frequency to a second frequency. The second frequency is 15Hz-20Hz, for example, it can be set to 20Hz. This frequency is significantly lower than the first frequency (30Hz-35Hz), which can greatly reduce the circulation flow rate and fluid impact force of the bath liquid, as well as the mechanical traction force of the fabric lifting roller on the fabric, thereby effectively reducing the risk of irreversible rigid tearing caused by the superposition of high concentration of short fibers and strong mechanical force on the fragile fibers.

[0037] It should be noted that if only the temperature is lowered without reducing the frequency, the high concentration of short fibers that have already been detached from the bath will still abrade the fiber surface under the continuous circulation impact of the main circulation pump; if only the frequency is reduced without lowering the temperature, the enzymes will still maintain high activity at a suitable temperature, and the chemical etching of the fiber will continue. This step uses a synergistic treatment of rapidly lowering the temperature to inactivate and quiescent the enzymes and rapidly reducing the frequency to 15Hz-20Hz to eliminate mechanical damage. At the same time, it blocks the damage path from both chemical and physical dimensions, thereby achieving precise melting of over-etched fibers and effectively protecting the tensile strength of the fabric. Furthermore, the above melting treatment is dynamically determined based on real-time feedback of the bath turbidity, thus adapting to fluctuations in the enzymatic reaction rate caused by differences in the initial weaving stress of different batches of fabric, avoiding the under-treatment or over-treatment problems caused by fixed time control in conventional processes.

[0038] Step 3: When the above-mentioned operation in the first temperature range reaches the preset time, or after the above-mentioned operation of injecting cold water to cool down is performed, the centralized control system controls the bath liquid to rise from the current temperature to the second temperature range, which is higher than the first temperature range and is the activation and release temperature of the temperature-sensitive antibacterial agent; during the heating period, the centralized control system controls the operating frequency of the main circulation pump and the cloth lifting roller to increase proportionally with the rise of the bath liquid temperature, and opens the drain valve to lower the bath liquid to the second water level, which is lower than the first water level; Once the operation in the first temperature range in step 1 has been maintained for the preset duration, or after the cooling operation of injecting cold water has been performed in step 2, the centralized control system initiates the heating program. The centralized control system controls the heating device to operate, causing the bath liquid to rise from its current temperature to the second temperature range. The second temperature range is 75℃-85℃, which is the activation and release temperature of the temperature-sensitive microcapsule antibacterial agent. The heating rate is preferably controlled between 1.0℃ / min and 2.0℃ / min, for example, it can be set to 1.5℃ / min. Within this heating rate range, it can ensure that the microcapsule wall material undergoes an orderly transition from a glassy state to a highly elastic state during the heating process, avoiding wall material cracking and failure due to excessive heating, while also ensuring that production efficiency is not excessively affected.

[0039] During the heating period, the centralized control system simultaneously performs the following operations: 1) Control the operating frequency of the main circulation pump and the lifting roller to increase proportionally with the rise of the bath liquid temperature. At this time, the main circulation pump and the lifting roller are in a synchronous linkage state, and their frequencies increase synchronously with the temperature rise according to the preset reference ratio curve until the rated operating frequency is reached. 2) Open the drain valve to lower the bath liquid to a second water level below the first water level. The preferred bath ratio for this second water level is 1:5 to 1:7, for example, 1:6. It should be noted that lowering the water level from the first water level (bath ratio 1:8-1:12) to the second water level (bath ratio 1:5-1:7) aims to: during the heating and subsequent antibacterial agent release and dyeing stages, increase the concentration gradient of the effective components (antibacterial agent, dye) in the bath liquid by reducing the bath ratio, thereby enhancing the mass transfer driving force for the diffusion of the effective components into the fiber interior; simultaneously, the lower bath ratio corresponding to the second water level, combined with the proportionally increasing mechanical frequency, can jointly form a higher intensity fluid impact force, providing favorable hydrodynamic conditions for deep anchoring of the antibacterial agent and uniform dye penetration.

[0040] It should be noted that if the circuit breaker protection in step 2 is not triggered, the central control system will start heating directly after the low-temperature enzyme treatment in step 1 reaches the preset time. The operating frequency of the main circulation pump and the cloth lifting roller will be controlled to increase synchronously with the temperature rise using the built-in reference ratio curve. At the same time, the drain valve will be opened to lower the bath liquid to the second water level.

[0041] If the operation of injecting cold water to cool down is performed in step 2, then before the operating frequency increases proportionally with the temperature rise and the water is drained to the second water level, the method of this embodiment further includes the following more refined control process: Optionally, refer to Figure 2As shown, if the cold water injection cooling operation was performed in step 2, then before the central control system controls the operating frequency of the main circulation pump and the fabric lifting roller to increase proportionally with the rise of the bath liquid temperature, and before opening the drain valve to lower the bath liquid to a second water level below the first water level, the method further includes: When the circuit breaker protection in step 2 is triggered, a large number of short fibers shed by enzymatic desorption are suspended in the bath. If the water level is directly drained and lowered to proceed to the subsequent heating and dyeing stages according to conventional processes, the fabric will act as a filter. A large number of short fibers will gradually accumulate on the fabric surface as the liquid level drops during drainage, and under low bath ratio conditions, they will be forcibly pressed into the interlacing pores of the yarn by the liquid flow pressure. In other words, the fabric acts as a filter medium during drainage, trapping and embedding the short fibers inside the yarn pores. These embedded short fibers cannot be removed by conventional washing in subsequent processing, forming dead fiber balls. Simultaneously, the short fibers embedded in the pores physically block the diffusion path of dye molecules and antibacterial agents into the fiber interior, causing white spots that prevent dyeing. To eliminate the above-mentioned filtration and embedding effect, this embodiment performs the following operation before drainage: Step 31: While maintaining the first water level, the centralized control system decouples the synchronous linkage between the main circulation pump and the fabric lifting roller, executing a preset number of alternating delinting cycles; wherein, refer to Figure 3 As shown, a single delinting cycle consists of the following two consecutive stages: During the stretching and rinsing stage: the fabric roller is controlled to reduce its frequency to a residence frequency lower than the second frequency (e.g., reduced to 10Hz), while the main circulation pump is simultaneously controlled to output instantaneous jet pulses higher than the rated operating frequency (e.g., output at 60Hz). During this stage, the fabric loses effective traction due to the fabric roller reducing its frequency to 10Hz, and is in a tension-free stacked and swollen state in the bath liquid, with the interlacing pores of the yarn in a naturally open state. At the same time, the main circulation pump outputs instantaneous jet pulses at 60Hz (50Hz higher than the rated frequency), and high-speed water flows through the yarn pores of the fabric from the inside to the outside, forming a backwash, which washes away the free short fibers that were trapped in the interlacing pores of the yarn after the enzymatic desorption in the previous stage.

[0042] Drafting and extrusion stage: Control the main circulation pump to reduce its frequency (e.g., to 15Hz), and simultaneously control the fabric lifting roller to increase its frequency to a higher frequency than the first frequency (e.g., to 45Hz). In this stage, the main circulation pump is reduced to 15Hz, and the fluid impact force of the bath liquid is reduced to an extremely low level; the fabric lifting roller pulls the fabric at a high speed of 45Hz (35Hz higher than the first frequency), causing the fabric to instantly change from a tension-free stacked and bloated state to a stretched and taut state. The interlacing pores of the yarn then contract and close rapidly, squeezing out the short fibers that have been loosened by the water flow in the first stage but have not yet completely detached, along with the internal fiber-containing moisture.

[0043] The aforementioned stretching and rinsing stage and stretching and squeezing stage are alternately performed a preset number of times (e.g., 3 times). Through the alternating action of repeated swelling and rinsing, tensioning and squeezing, the yarn pores undergo periodic changes of opening and closing, gradually loosening and expelling short fibers embedded at different depths inside the pores.

[0044] Step 32: After completing the preset number of deflossing cycles, the centralized control system, while keeping the fabric in the stretched tension state, opens the drain valve to lower the bath liquid to the second water level, then controls the main circulation pump and the fabric lifting roller to resume synchronous linkage, and executes the operation of increasing the operating frequency proportionally with the rise of the bath liquid temperature.

[0045] After completing the preset number of delinting cycles, the centralized control system performs drainage and mode switching operations.

[0046] Specifically, while maintaining the fabric in a stretched and taut state—that is, keeping the fabric lifting roller operating at a frequency higher than the first frequency (e.g., 45Hz) and the main circulation pump operating at a frequency lower than the second frequency (e.g., 15Hz)—the centralized control system opens the drain valve to lower the bath liquid to the second water level. Once drainage is complete and the bath liquid reaches the second water level, the centralized control system controls the main circulation pump and the fabric lifting roller to resume synchronous operation, and executes the operation where the operating frequency increases proportionally with the rise in bath liquid temperature.

[0047] It should be noted that the design of keeping the fabric under tension for drainage is based on the following considerations: 1) When the fabric is taut, the interlacing pores between the yarns tend to close due to the stretching of the fiber bundles, significantly reducing or even eliminating the pore size. In this state, when draining, free short fibers in the bath liquid are effectively blocked from the fabric surface because their particle size is larger than the closed pore size, preventing them from entering the yarn interior. Conversely, if draining is done in a relaxed state, the yarn pores are naturally open. During drainage, short fibers move with the liquid flow and are easily carried into the pores and become trapped, causing secondary contamination. Therefore, maintaining tension during drainage can physically prevent secondary trapping of short fibers.

[0048] 2) During drainage, the liquid level continuously drops, and the bath liquid flows through the fabric from the inside out or from the outside in. Under tension, the yarn pores are closed, significantly increasing flow resistance, making it difficult for short fibers to enter the fabric. Under relaxation, the pores are open, flow resistance is low, and short fibers easily enter and become embedded in the pores. This step, by maintaining tension, effectively utilizes the natural flow pressure difference generated during drainage; this pressure difference pushes the short fibers away rather than pressing them into the fabric surface.

[0049] 3) If the fabric is loosened before draining water after delinting, the short fibers discharged from the pores during the delinting cycle will not have completely detached from the fabric's periphery. After loosening, the fabric pores will reopen, and the short fibers will re-enter the pores during drainage, rendering the delinting operation ineffective. This step, by maintaining tension after the delinting cycle is completed and draining water directly, ensures the complete preservation of the delinting effect.

[0050] After drainage is completed and the bath liquid level drops to the second level, the centralized control system controls the main circulation pump and the fabric lifting roller to resume synchronous operation. Resuming synchronous operation means switching them back from independent frequency control in a decoupled state to a linked state, meaning their operating frequencies increase synchronously with the temperature rise according to the same baseline proportional curve. At this point, all operations related to the delinting cycle are completed, and the system transitions from the short fiber removal mode following abnormal conditions to the normal heating and processing mode.

[0051] Optionally, continue to refer to Figure 2 As shown, the centralized control system controls the operating frequency of the main circulation pump and the fabric lifting roller to increase proportionally with the rise in bath temperature, including: Step 33: The centralized control system controls the operating frequency of the main circulation pump and the fabric lifting roller to initially increase as the bath temperature rises using the built-in reference proportional curve, and collects the output torque current value of the fabric lifting roller drive motor in real time; during the process of heating to the second temperature range, the real-time change rate of the output torque current value with respect to time is calculated. After the delinting cycle is completed and the water level drops to the second level, and the synchronous linkage is restored (or, in the case where the fuse protection is not triggered, after the heating starts directly), the centralized control system starts the frequency increment control program during the heating process.

[0052] It should be noted that the output torque current of the fabric lifting roller drive motor is directly proportional to the load torque borne by the lifting roller, and is an electrical parameter characterizing the mechanical load state of the lifting roller. During normal fabric operation, the loads that the lifting roller drive motor needs to overcome mainly include: the frictional resistance between the fabric and the surface of the lifting roller, the component of the fabric's own weight in the direction of movement, the viscous resistance between the fabric and the bath liquid, and the frictional force between the fabric and the tube wall as the fabric runs through the equipment's guide tube. The combined effect of these loads causes the lifting roller drive motor to output a corresponding torque to maintain the stable operation of the fabric; the magnitude of this torque is directly reflected in the output torque current value of the drive motor.

[0053] During the heating process, the centralized control system controls the frequency of the main circulation pump and the fabric lifting roller to increase synchronously according to a preset reference proportional curve (i.e., a mapping relationship in which frequency increases linearly or piecewise linearly with temperature). Simultaneously, the centralized control system acquires the output torque current value of the fabric lifting roller drive motor in real time at a high sampling frequency (e.g., once every 100ms), and calculates the real-time rate of change (dI / dt) of this value with respect to time using a sliding window or differential algorithm. It should be understood that this real-time rate of change reflects the instantaneous trend of the torque current: a positive rate of change indicates that the load torque is increasing, a negative rate of change indicates that the load torque is decreasing, and the absolute value of the rate of change reflects the drastic degree of load change. By monitoring this rate of change, the centralized control system can promptly capture transient changes in the friction state between the fabric and the fabric lifting roller.

[0054] Step 34: When the real-time change rate shows a negative sudden change and is lower than the preset lubrication drop threshold, it is determined that the temperature-sensitive antibacterial agent in the bath liquid has entered the wall material softening phase. The centralized control system triggers the first dynamic correction, adjusts the frequency increase ratio coefficient of the main circulation pump to a level lower than the reference ratio curve, and simultaneously adds the slip compensation frequency to the fabric lifting roller to eliminate fabric slippage. It should be noted that the wall material of thermosensitive microcapsules is usually composed of polymeric materials with thermally responsive properties, such as poly(N-isopropylacrylamide) (PNIPAM) and its copolymers, and cross-linked polymers with adjustable phase transition temperatures. These materials are in a glassy state below their glass transition temperature (Tg), exhibiting a rigid and structurally intact wall material that can effectively encapsulate antibacterial agent molecules. When the temperature rises to near Tg, the polymeric chain segments begin to move, and the wall material gradually transitions from a glassy state to a highly elastic state, exhibiting significant viscoelastic characteristics. At this point, the flexibility and permeability of the wall material change significantly.

[0055] During the heating process, when the bath temperature rises to near the glass transition temperature of the microcapsule wall material (e.g., approximately 65°C, depending on the Tg value of the selected wall material), the microcapsule wall material begins to soften. The softened microcapsules adhere to the fiber surface through mechanical contact during fabric movement, and their viscoelastic wall material forms a lubricating film between the fiber and the fabric roller. This lubricating film significantly reduces the coefficient of friction between the fabric and the fabric roller surface, resulting in a substantial reduction in the traction force required by the fabric roller drive motor to maintain fabric movement. The load torque drops sharply, manifested as a rapid decrease in the output torque current value, with its real-time rate of change exhibiting a negative abrupt change.

[0056] When the magnitude of this negative abrupt change exceeds the preset lubrication drop threshold, the centralized control system determines that the microcapsules have entered the softening phase of the wall material. It should be noted that the lubrication drop threshold is an adjustable parameter that can be pre-calibrated according to process conditions such as fabric type, fabric roller wrap angle, and operating speed. It is used to distinguish between minor current fluctuations under normal operating conditions and significant load drops caused by the softening phase.

[0057] At this point, the centralized control system triggers the first dynamic correction, which includes two coordinated actions: 1) Adjust the frequency increase ratio of the main circulation pump to a level lower than the baseline ratio curve. The frequency increase ratio refers to the slope of frequency increase with temperature, i.e., dF / dT. Lowering this ratio means that the rate at which the main circulation pump frequency increases with temperature slows down, resulting in a smaller increase in frequency for the same temperature increment. This weakens the growth rate of the bath liquid circulation flow rate and fluid shear force.

[0058] It should be understood that the purpose of this correction is to prevent the strong shear force of the water flow caused by an excessively rapid increase in the frequency of the main circulation pump from mechanically damaging the microcapsule wall material when it is in a softened and fragile state. If the softened microcapsules are subjected to strong shear flow when the frequency of the main circulation pump is too high, the wall material is very likely to rupture irreversibly, causing the encapsulated antibacterial agent to be released prematurely and lost into the bath solution before it can enter the fiber interior, thus significantly reducing the antibacterial treatment effect.

[0059] 2) Synchronously add slip compensation frequency to the fabric lifting roller to eliminate fabric slippage. As mentioned earlier, the lubricating effect of the microcapsule softening phase not only reduces the load torque but also decreases the friction between the fabric and the lifting roller surface. When the friction is insufficient to provide the traction force required for fabric movement, the fabric will slide relative to the lifting roller, i.e., slippage. Slippage leads to uncontrollable fluctuations in the fabric running speed, causing uneven residence time of the fabric in the equipment and affecting batch consistency; on the other hand, the relative movement between the fabric and the lifting roller during slippage generates localized frictional heat and mechanical abrasion, causing irreversible physical damage to the fabric surface.

[0060] To eliminate slippage, the centralized control system superimposes a positive slip compensation frequency onto the drive frequency of the fabric lifting roller. The magnitude of this compensation frequency is positively correlated with the negative abrupt change amplitude; that is, the larger the abrupt change amplitude, the stronger the lubrication effect, and the greater the compensation required. This compensation frequency increases the actual rotational speed of the fabric lifting roller beyond the reference frequency, thereby maintaining the linear velocity of the fabric by increasing the rotational speed while reducing the coefficient of friction, thus preventing relative slippage of the fabric on the roller surface.

[0061] It should be understood that in the two actions mentioned above, adjusting the frequency increase ratio of the main circulation pump to protect the microcapsules and superimposing the slip compensation frequency to eliminate slippage, the former acts on the bath liquid fluid field to protect the physical integrity of the microcapsules, and the latter acts on the mechanical traction field to ensure the smooth operation of the fabric.

[0062] Step 35: As the temperature continues to rise, when the real-time rate of change changes from negative to positive and crosses zero, it is determined that the temperature-sensitive antibacterial agent has entered the release phase. The centralized control system triggers the second dynamic correction, adjusting the frequency increase ratio coefficient of the main circulation pump to a level higher than the reference ratio curve. The increasing hydraulic impulse is used to allow the antibacterial agent in the release phase to penetrate into the fabric until the bath temperature reaches the second temperature range, at which point the reference ratio is restored and the rated operating frequency is reached.

[0063] It should be noted that as the temperature continues to rise and exceeds the glass transition temperature range of the microcapsule wall material (e.g., exceeding 70°C), the movement of the polymer chain segments in the wall material intensifies further, and the microstructure of the wall material undergoes significant changes: more free volume and micropore channels are formed in the cross-linked network, and the permeability of the wall material increases sharply. At this time, the antibacterial agent molecules encapsulated inside the microcapsules begin to diffuse and release outward through the micropores or defect channels formed in the wall material; this stage is the drug release phase. During this process, the microcapsule wall material gradually transforms from a viscoelastic state to a softer, more elastic state, and its lubricating effect on the fiber surface diminishes: this is partly because the lubricating components in the wall material are released along with the antibacterial agent and decrease, and partly because the surface properties of the fabric change at high temperatures. As the lubricating effect diminishes, the coefficient of friction between the fabric and the lifting roller gradually returns to normal, the load torque of the lifting roller drive motor rebounds, and the output torque current value gradually recovers from a falling state, with its real-time rate of change changing from negative to positive.

[0064] When the real-time rate of change turns from negative to positive and crosses zero, the centralized control system determines that the microcapsule has passed through the wall material softening phase and entered the drug release phase. At this time, the permeability of the microcapsule wall material has been fully opened, the antibacterial agent is being released into the bath liquid, and the mechanical strength of the wall material recovers with the increase of temperature (the fracture toughness of the wall material in the high elastic state is usually better than that in the viscous flow state near Tg), and it is no longer as fragile and easily broken as in the softening phase.

[0065] At this point, the centralized control system triggers a second dynamic correction: the frequency increase ratio of the main circulation pump is raised to a level higher than the reference ratio curve, causing the main circulation pump frequency to rise with temperature at a faster rate than the reference curve. It should be understood that the accelerated bath liquid circulation flow increases the turbulence intensity of the bath liquid flow, resulting in stronger hydraulic shearing and convection diffusion effects; and the sharp increase in the main circulation pump frequency generates an instantaneous hydraulic impulse (i.e., the change in fluid momentum per unit time), which acts on the fabric surface in pulse form, pushing the antibacterial agent molecules in the bath liquid to overcome the resistance of the diffusion boundary layer on the fiber surface.

[0066] It should be noted that the penetration of antibacterial agents into the fiber interior is diffusion-controlled. The diffusion flux depends on the concentration gradient of the antibacterial agent in the bath solution, the free volume of the amorphous region of the fiber, and the driving force acting on the diffusion process. Among these, the mechanical driving force (i.e., hydraulic impulse) is the only externally controllable factor. There is a limited window period between the release of the antibacterial agent from the microcapsule and its adsorption and anchoring by the fiber. If the antibacterial agent fails to penetrate the fiber interior within this window, the released antibacterial agent will be re-adsorbed by the wall material or lost with the bath solution circulation. This step increases the frequency boosting ratio of the main circulation pump in the drug release phase, ensuring that the hydraulic impulse reaches its peak within the antibacterial agent release window. This provides sufficient kinetic energy for the antibacterial agent molecules to break through the diffusion boundary layer on the fiber surface and enter the amorphous region and pore structure inside the fiber, achieving deep penetration and long-term anchoring.

[0067] As the temperature continues to rise, the drug release rate of the microcapsules gradually slows down, and the microstructure of the wall material tends to stabilize after releasing most of the effective components. When the bath temperature reaches the second temperature range, the drug release process of the antibacterial agent is basically completed. The centralized control system restores the frequency of the main circulation pump and the fabric lifting roller to the frequency value corresponding to the reference ratio curve and reaches the rated operating frequency of the equipment, preparing for the next dyeing process.

[0068] Step 4: When the bath temperature reaches the second temperature range, add dye to the bath. The central control system controls the main circulation pump and the fabric lifting roller to rise to the rated operating frequency, and maintains the second temperature range and the rated operating frequency until the preset bath treatment time ends.

[0069] When the bath temperature rises to the second temperature range (75℃-85℃, e.g., 80℃), the temperature-sensitive microcapsule antibacterial agent has completed the softening of the wall material and drug release anchoring during the heating process in step 3. At this time, reactive dye is added to the bath, and the centralized control system controls the main circulation pump and the fabric lifting roller to rise to the rated operating frequency of the equipment (e.g., 50Hz), and maintains the second temperature range and the rated operating frequency until the preset bath treatment time ends (e.g., maintaining 80℃ and 50Hz operation for 40 minutes).

[0070] It should be noted that adding the dye after the bath has reached the second temperature range can prevent premature hydrolysis or aggregation of the dye during the heating process. At the second temperature range, the movement of the fiber amorphous chain segments intensifies, providing favorable conditions for dye molecule diffusion. The main circulation pump and fabric roller operate at their rated frequency, providing maximum intensity of bath circulation and hydraulic impact, enabling rapid and uniform dye dispersion, while simultaneously accelerating the diffusion and penetration of dye molecules into the fiber interior, achieving deep dyeing and uniform fixation.

[0071] After the preset bath treatment time is completed, the method of this embodiment may further include a post-treatment process: cooling and discharging the bath liquid, and sequentially performing conventional warm water washing (e.g., 40°C), neutralization, dehydration and drying (e.g., 100°C) on the fabric to remove residual floating dye and auxiliaries on the fabric surface, so that the fabric obtains the color fastness and hand feel required by the finished product.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes, characterized in that, include: Step 1: Add modal blended fabric, enzymes and temperature-sensitive antibacterial agent to the bath liquid. The centralized control system maintains the bath liquid temperature in the first temperature range. At the same time, open the water inlet valve to set the bath liquid to the first water level, and control the main circulation pump and fabric lifting roller to operate at a first frequency lower than the rated operating frequency of the equipment. Step 2: During the operation of maintaining the first temperature range, when it is determined that the turbidity data of the bath liquid collected in real time by the sensor is higher than the preset turbidity threshold, the centralized control system injects cold water to reduce the temperature of the bath liquid to below the first temperature range, and controls the main circulation pump and the fabric lifting roller to operate at a second frequency lower than the first frequency. Step 3: When the above-mentioned operation in the first temperature range reaches the preset time, or after the above-mentioned operation of injecting cold water to cool down is performed, the centralized control system controls the bath liquid to rise from the current temperature to the second temperature range, which is higher than the first temperature range and is the activation and release temperature of the temperature-sensitive antibacterial agent; during the heating period, the centralized control system controls the operating frequency of the main circulation pump and the cloth lifting roller to increase proportionally with the rise of the bath liquid temperature, and opens the drain valve to lower the bath liquid to the second water level, which is lower than the first water level; Step 4: When the bath temperature reaches the second temperature range, add dye to the bath. The central control system controls the main circulation pump and the fabric lifting roller to rise to the rated operating frequency, and maintains the second temperature range and the rated operating frequency until the preset bath treatment time ends.

2. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, The enzyme is acidic cellulase, and the thermosensitive antibacterial agent is a microcapsule antibacterial agent with thermal response properties for wall materials.

3. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, The first temperature range is 45℃-55℃, and the second temperature range is 75℃-85℃.

4. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, The rated operating frequency of the device is 50Hz, the first frequency is 30Hz-35Hz, and the second frequency is 15Hz-20Hz.

5. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, If the cold water injection cooling operation was performed in step 2, then before the central control system controls the main circulation pump and the fabric lifting roller to increase their operating frequency proportionally with the rise in bath liquid temperature, and before opening the drain valve to lower the bath liquid to a second water level below the first water level, the method further includes: Step 31: While maintaining the first water level, the centralized control system decouples the synchronous linkage between the main circulation pump and the fabric lifting roller, and executes a preset number of alternating delinting cycles; wherein a single delinting cycle includes: Control the fabric lifting roller to reduce its frequency to a dwell frequency lower than the second frequency, and simultaneously control the main circulation pump to output an instantaneous jet pulse higher than the rated operating frequency, so that the fabric is in a tension-free stacked and swollen state in the bath liquid; then, control the main circulation pump to reduce its frequency to a frequency lower than the second frequency, and simultaneously control the fabric lifting roller to increase its frequency to a frequency higher than the first frequency, so that the fabric is stretched and tensioned. Step 32: After completing the preset number of deflossing cycles, the centralized control system, while keeping the fabric in the stretched tension state, opens the drain valve to lower the bath liquid to the second water level, then controls the main circulation pump and the fabric lifting roller to resume synchronous linkage, and executes the operation of increasing the operating frequency proportionally with the rise of the bath liquid temperature.

6. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, The centralized control system controls the operating frequency of the main circulation pump and the fabric lifting roller to increase proportionally with the rise in bath temperature, including: Step 33: The centralized control system controls the operating frequency of the main circulation pump and the fabric lifting roller to initially increase as the bath temperature rises using the built-in reference proportional curve, and collects the output torque current value of the fabric lifting roller drive motor in real time; during the process of heating to the second temperature range, the real-time change rate of the output torque current value with respect to time is calculated. Step 34: When the real-time change rate shows a negative sudden change and is lower than the preset lubrication drop threshold, it is determined that the temperature-sensitive antibacterial agent in the bath liquid has entered the wall material softening phase. The centralized control system triggers the first dynamic correction, adjusts the frequency increase ratio coefficient of the main circulation pump to a level lower than the reference ratio curve, and simultaneously adds the slip compensation frequency to the fabric lifting roller to eliminate fabric slippage. Step 35: As the temperature continues to rise, when the real-time rate of change changes from negative to positive and crosses zero, it is determined that the temperature-sensitive antibacterial agent has entered the release phase. The centralized control system triggers the second dynamic correction, adjusting the frequency increase ratio coefficient of the main circulation pump to a level higher than the reference ratio curve. The increasing hydraulic impulse is used to allow the antibacterial agent in the release phase to penetrate into the fabric until the bath temperature reaches the second temperature range, at which point the reference ratio is restored and the rated operating frequency is reached.

7. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, The first water level corresponds to a bath ratio of 1:8 to 1:12, and the second water level corresponds to a bath ratio of 1:5 to 1:

7.

8. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, The turbidity data of the bath liquid is obtained by a photoelectric turbidity sensor installed on the dye bath return pipeline of the equipment.

9. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, When the centralized control system controls the bath liquid to rise from the current temperature to the second temperature range, the heating rate is controlled at 1.0℃ / min-2.0℃ / min.

10. The method for optimizing the performance of sand-washed antibacterial modal blended fabric based on low-temperature enzymes according to claim 1, characterized in that, After the preset bath treatment time is completed, the process also includes: cooling and discharging the bath liquid, and sequentially performing conventional warm water washing, neutralization, dehydration and drying treatments on the fabric.

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