A system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric

Abstract

The utility model discloses an industrialized production moisture absorption and flame-retardant lyocell spunlace non - woven fabric's system relates to lyocell non - woven fabric production technical field, including the opener, carding engine, the web -laying machine, the spunlace machine, the sizing device of non - woven fabric infiltration sodium alginate solution, the spraying device and drying device that connect in proper order head and tail, the spraying device includes calcium chloride solution spraying mechanism and spraying water mechanism, and calcium chloride solution spraying mechanism is established in the side near sizing device, and spraying water mechanism is established in the side near drying device, and is equipped with the calender between sizing device and calcium chloride solution spraying mechanism, between calcium chloride solution spraying mechanism and spraying water mechanism respectively. The non - woven fabric prepared not only moisture absorption has been greatly promoted, and has good flame -retardant effect simultaneously, effectively solved the double defects of the insufficient moisture absorption and the lack of flame retardance of the existing lyocell non - woven fabric.

Description

Technical Field

[0001] This utility model relates to the field of lyocell nonwoven fabric production technology, and in particular to a system for the industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric. Background Technology

[0002] Lyocell fiber, a typical representative of regenerated cellulose fibers, is a high-performance fiber primarily made from natural wood pulp through dissolution spinning using NMMO (N-methylmorpholine-N-oxide) solvent. It combines the skin-friendliness of natural fibers with the mechanical strength of synthetic fibers, and boasts a solvent recovery rate exceeding 99% in its production process, making it a core material for "green textiles." Lyocell nonwoven fabrics, made from lyocell fibers using nonwoven processes (such as dry carding and wet spinning), retain the fiber's soft touch, high breathability, and biodegradability. They are widely used in medical dressings, hygiene products (such as diapers and wipes), household filtration materials (such as air conditioning filters and air purifier filters), and industrial protective materials, making it a key product type for the nonwoven materials industry in recent years.

[0003] It is worth noting that as downstream applications demand higher safety standards, the need for flame-retardant properties in lyocell nonwoven fabrics is becoming increasingly prominent. For example, medical bedding, the surface layer of baby diapers, and filter materials for public facilities need to meet higher fire protection standards to avoid safety hazards caused by accidental fire sources.

[0004] However, lyocell fiber still has significant performance limitations in nonwoven applications, with the most prominent being its insufficient moisture absorption and lack of flame retardancy. Compared to traditional regenerated cellulose fibers (such as viscose fiber), lyocell fiber has a lower moisture absorption rate and equilibrium moisture regain. Viscose fiber typically has a moisture regain of 13%-14%, while lyocell fiber only has 8%-10%. This difference directly results in lyocell nonwoven fabrics being unable to quickly absorb and diffuse moisture in environments with varying humidity levels. In actual use, this easily leads to problems such as static electricity accumulation on the nonwoven fabric surface and a noticeable dryness when in contact with skin. At the same time, lyocell fiber itself has a limiting oxygen index (LOI) of only 18%-20% (classifying it as a flammable material). Without flame retardant modification, it is prone to rapid combustion and heat release under high temperatures or fire sources, further limiting its widespread use in scenarios with stringent safety requirements, such as medical protective equipment and children's products. Therefore, improving the moisture absorption and flame retardancy of lyocell nonwoven fabric has become one of the urgent problems to be solved in the current lyocell nonwoven fabric production technology.

[0005] Currently, existing technologies can effectively improve the moisture absorption and flame retardancy of nonwoven fabrics through fiber modification, process optimization, or composite structure design. For example, patent CN109056321A discloses a method for preparing antibacterial and moisture-absorbing medical nonwoven fabric. First, collagen is dissolved in phosphate buffer, acryloyl chloride and fumed acid are added, and the mixture is stirred, dialyzed, and dried to obtain modified collagen. Then, the modified collagen is dissolved in phosphate buffer, and silica nanoparticles, polyvinyl alcohol, and tea polyphenols are added, followed by ultrasonic stirring to obtain a mixture. Finally, a polypropylene nonwoven fabric sample is added to ethanol for ultrasonic impregnation and drying. After ultraviolet radiation irradiation, it is immersed in a composite solution of ammonium sulfate, and after impregnation and drying, the antibacterial and moisture-absorbing medical nonwoven fabric is obtained. However, this patented process is complex and uses too many chemical reagents, which can easily affect the performance of the nonwoven fabric, making it difficult to apply in industrial production. For example, patent CN114318671B discloses a method for preparing a moisture-absorbing and antibacterial spunlace nonwoven fabric. The raw materials used are cellulose acetate, polylactic acid, and polyethylene fibers. First, the three fibers are impregnated with antioxidant and flame-retardant solutions. Then, four layers of fiber web are laid in the order of polyethylene fiber-cellulose acetate-polylactic acid fiber-polyethylene fiber, and reinforced with double hydroentangling to obtain a moisture-absorbing and antibacterial spunlace nonwoven fabric. However, this patent uses many types of fiber raw materials, has a complicated processing procedure, and a complex nonwoven fabric structure design, making it unsuitable for the production of lyocell nonwoven fabrics. For example, patent CN113290991B discloses a flame-retardant nonwoven fabric based on modification technology and its preparation method. This flame-retardant nonwoven fabric comprises, from the inside out, a composite nonwoven matrix layer, an outer flame-retardant layer, and an outer washable layer. The composite nonwoven matrix layer includes a first modified nonwoven matrix layer and a second modified nonwoven matrix layer. The second modified nonwoven matrix layer and the first modified nonwoven matrix layer are pressed together to obtain the flame-retardant matrix layer. Then, the outer flame-retardant layer and the outer washable layer are sequentially applied to the surface of the flame-retardant matrix layer to obtain the flame-retardant nonwoven fabric. However, in this patent method, the main body of the nonwoven fabric is a mixture of multiple fibers. Although the final nonwoven fabric has good flame retardancy, due to the use of multiple synthetic fibers, it does not have good moisture absorption. Utility Model Content

[0006] This invention aims to provide a system for the industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric. In the lyocell nonwoven fabric production process, the nonwoven fabric after the spunlace process is impregnated with sodium alginate solution for sizing, then subjected to roller pressing, followed by spraying with calcium chloride solution, and then undergoing washing, drying, and winding steps to obtain the moisture-absorbing and flame-retardant lyocell nonwoven fabric. The prepared nonwoven fabric not only has significantly improved moisture absorption but also exhibits excellent flame-retardant properties, effectively solving the dual defects of insufficient moisture absorption and inadequate flame retardancy in existing lyocell nonwoven fabrics.

[0007] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows: A system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric includes an opening machine, a carding machine, a web-laying machine, a spunlace machine, a sizing device for impregnating the nonwoven fabric with sodium alginate solution, a spraying device, and a drying device, connected sequentially end to end. The spraying device includes a calcium chloride solution spraying mechanism and a water spraying mechanism. The calcium chloride solution spraying mechanism is located near the sizing device, and the water spraying mechanism is located near the drying device. Roller dryers are respectively installed between the sizing device and the calcium chloride solution spraying mechanism, and between the calcium chloride solution spraying mechanism and the water spraying mechanism.

[0008] The bottom of each of the rolling mills is equipped with a recycling tank.

[0009] The rolling mill includes a second frame, idler rollers, rolls, and guide rollers. The idler rollers, rolls, and guide rollers are arranged horizontally and parallel inside the second frame. The two ends of the idler rollers, rolls, and guide rollers are rotatably connected to the second frame. The rolls are located above the idler rollers, and the rolls are in clearance fit with the idler rollers. The guide rollers are located on one side of the idler rollers.

[0010] The recycling trough is located at the bottom of the idler roller.

[0011] The spraying water mechanism and drying device are equipped with a vacuum water suction device.

[0012] The sizing device includes a frame, a sizing tank containing sodium alginate solution, a liquid-carrying roller that drives the sodium alginate solution to wet the nonwoven fabric, and a sizing pressure roller that presses the nonwoven fabric in the direction of travel to bring the nonwoven fabric into contact with the liquid-carrying roller. The sizing tank is located inside the frame. The two ends of the liquid-carrying roller and the sizing pressure roller are rotatably connected to the frame. The lower part of the liquid-carrying roller is immersed in the sodium alginate solution in the sizing tank. The liquid-carrying roller and the sizing pressure roller are arranged parallel to each other in the horizontal direction. The sizing pressure roller is located above the liquid-carrying roller and is fitted with a gap between the liquid-carrying roller and the liquid-carrying roller.

[0013] One side of the liquid roller is also equipped with a scraper mechanism to scrape off excess sodium alginate solution.

[0014] The scraper mechanism includes a scraper force adjustment cylinder, a scraper fixing frame, a scraper position adjustment cylinder, and a scraper blade. One end of the scraper position adjustment cylinder is fixedly connected to the machine frame through the scraper fixing frame. The other end of the scraper position adjustment cylinder is fixedly connected to one end of the scraper force adjustment cylinder. The other end of the scraper force adjustment cylinder is fixedly connected to one end of the scraper blade. The other end of the scraper blade extends toward the direction of the liquid roller.

[0015] The beneficial effects of this utility model are: 1. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric in this invention can be integrated with spunlace nonwoven fabric production without affecting the original production process, thus enhancing its industrial applicability. The process does not use any toxic chemical reagents; instead, it introduces natural high-molecular-weight sodium alginate, utilizing the flame-retardant properties of calcium alginate to impart excellent flame-retardant performance to the lyocell nonwoven fabric without affecting its original biocompatibility.

[0016] 2. The system for industrial production of moisture-absorbing and flame-retardant Lyocell spunlace nonwoven fabric of this utility model not only significantly improves the moisture absorption of Lyocell nonwoven fabric, but also has good flame-retardant effect, effectively solving the dual defects of insufficient moisture absorption and lack of flame retardancy of existing Lyocell nonwoven fabric. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system for the industrial production of moisture-absorbing and flame-retardant Lyocell spunlace nonwoven fabric according to this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the rolling mill of this utility model.

[0019] Figure 3 This is a schematic diagram of the sizing device of this utility model.

[0020] Figure 4 This is a schematic diagram of the scraper mechanism of this utility model.

[0021] The components include: 1. Opening machine; 2. Carding machine; 3. Web laying machine; 4. Hydroentangling machine; 5. Sizing device; 6. Spraying device; 7. Drying device; 8. Calcium chloride solution spraying mechanism; 9. Spraying water mechanism; 10. Roller dryer; 11. Recycling tank; 12. Frame two; 13. Idler roller; 14. Roller; 15. Guide roller; 16. Vacuum water suction device; 17. Frame one; 18. Slurry tank; 19. Liquid roller; 20. Sizing pressure roller; 21. Scraper mechanism; 22. Scraper force adjustment cylinder; 23. Scraper fixing frame; 24. Scraper position adjustment cylinder; 25. Scraper plate; 26. Nonwoven fabric. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0023] Example 1 This embodiment provides a method such as Figures 1 to 4The system shown is for the industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric. It includes an opening machine 1, a carding machine 2, a web laying machine 3, a spunlace machine 4, a sizing device 5 for impregnating the nonwoven fabric 26 with sodium alginate solution, a spraying device 6, and a drying device 7, which are connected end to end in sequence. The spraying device 6 includes a calcium chloride solution spraying mechanism 8 and a water spraying mechanism 9. The calcium chloride solution spraying mechanism 8 is located on the side near the sizing device 5, and the water spraying mechanism 9 is located on the side near the drying device 7. Roller dryers 10 are respectively provided between the sizing device 5 and the calcium chloride solution spraying mechanism 8, and between the calcium chloride solution spraying mechanism 8 and the water spraying mechanism 9.

[0024] In this embodiment, the opening machine 1 is W1051A-3-JX2; the carding machine 2 is W1204B-SCY3-1 / 2; the web laying machine 3 is W1256A-400; the hydroentangling machine 4 is W1573M-250-YLY1; the spraying device 6 is G102-370-036; and the drying device 7 is ZW2729-250-SCY2. In this embodiment, the industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric is completed through the following steps: S1: The lyocell fiber raw material is sequentially passed through an opening machine 1, a carding machine 2, a web laying machine 3, and a hydroentanglement machine 4 for opening, carding, web laying, and hydroentanglement, and then consolidated to obtain the initial product of lyocell nonwoven fabric; The specifications of the lyocell fiber raw material are: 1.2D × 38 mm; S2: The obtained Lyocell nonwoven fabric primary product is impregnated with sodium alginate solution by sizing device 5, and then pressed by sizing machine 10. The sodium alginate solution has a concentration of 0.1 wt% and a temperature of 40°C. The nonwoven fabric after the compression treatment has a roll-out rate of 100%; S3: The lyocell nonwoven fabric after pressing and rolling is sprayed with calcium chloride solution by calcium chloride solution spraying mechanism 8, then pressed and rolled by rolling mill 10, washed by spray water mechanism 9 and dried by drying device 7, and finally wound to obtain moisture-absorbing and flame-retardant lyocell nonwoven fabric.

[0025] The concentration of the calcium chloride solution is 0.2 wt%, and the temperature is 40°C; The water temperature during the washing process is 40℃; The drying temperature is 80°C.

[0026] Example 2 In this embodiment, as Figure 2As shown, the bottom of the rolling mill 10 is provided with a recovery trough 11. The rolling mill 10 includes a frame 12, idler rollers 13, rolling mill rolls 14, and guide rollers 15. The idler rollers 13, rolling mill rolls 14, and guide rollers 15 are arranged horizontally parallel inside the frame 12. The two ends of the idler rollers 13, rolling mill rolls 14, and guide rollers 15 are rotatably connected to the frame 12. The rolling mill rolls 14 are located above the idler rollers 13, and the rolling mill rolls 14 and idler rollers 13 are in clearance fit. The guide rollers 15 are located on one side of the idler rollers 13. The recovery trough 11 is located at the bottom of the idler rollers 13.

[0027] In this embodiment, the rolling mill 10, through the gap fit between the rolling mill 14 and the idler roller 13, presses the nonwoven fabric 26 between the rolling mill 14 and the idler roller 13, extruding excess sodium alginate solution or calcium chloride solution from the nonwoven fabric 26, ensuring sufficient subsequent reaction and stable product performance. The guide roller 15 guides the nonwoven fabric 26 to move smoothly, avoiding damage caused by deviation. The bottom recovery tank 11 can recover the extruded solution, realizing the recycling of raw materials, reducing losses and production costs. This improves production continuity and efficiency, ensures product quality and environmental and economic benefits, and adapts to the needs of large-scale industrial production.

[0028] Example 3 In this embodiment, the spray water mechanism 9 and the drying device 7 are equipped with a vacuum water suction device 16.

[0029] In this embodiment, the vacuum water suction device 16 is a 2BEC-40 with an ultimate vacuum of 160 hPa and a maximum pumping speed of 80 m3 / h. In this embodiment, the vacuum desiccant 16 can quickly remove excess water from the nonwoven fabric 26 after washing, reducing the energy consumption and workload of the subsequent drying device 7 and shortening the drying time. At the same time, it avoids uneven distribution of calcium alginate caused by residual moisture, ensuring stable moisture absorption and flame retardant properties of the product, improving production continuity and efficiency, and adapting to the needs of large-scale industrial production.

[0030] Example 4 In this embodiment, as Figure 3 As shown, the sizing device 5 includes a frame 17, a sizing tank 18 containing sodium alginate solution, a liquid-carrying roller 19 that drives the sodium alginate solution to impregnate the nonwoven fabric 26, and a sizing pressure roller 20 that presses the nonwoven fabric 26 in the direction of travel to bring the nonwoven fabric 26 into contact with the liquid-carrying roller 19. The sizing tank 18 is located inside the frame 17. The two ends of the liquid-carrying roller 19 and the sizing pressure roller 20 are rotatably connected to the frame 17. The lower part of the liquid-carrying roller 19 is immersed in the sodium alginate solution in the sizing tank 18. The liquid-carrying roller 19 and the sizing pressure roller 20 are arranged parallel to each other in the horizontal direction. The sizing pressure roller 20 is located above the liquid-carrying roller 19 and is in clearance fit with the liquid-carrying roller 19.

[0031] In this embodiment, the lower part of the liquid-carrying roller 19 is immersed in a sodium alginate solution. Rotation causes the sodium alginate solution to adhere to the surface of the roller 19. Above it, a parallel sizing roller 20 presses down on the nonwoven fabric 26, ensuring full contact between the nonwoven fabric 26 and the liquid-carrying roller 19, achieving uniform wetting. Stable control of the amount of sodium alginate solution adhering lays the foundation for the subsequent reaction with calcium chloride to generate calcium alginate, ensuring uniform and stable moisture absorption and flame retardant properties of the nonwoven fabric 26.

[0032] Example 5 In this embodiment, as Figure 3 and Figure 4 As shown, a scraper mechanism 21 for scraping off excess sodium alginate solution is also provided on one side of the liquid roller 19. The scraper mechanism 21 includes a scraper force adjustment cylinder 22, a scraper fixing frame 23, a scraper position adjustment cylinder 24, and a scraper blade 25. One end of the scraper position adjustment cylinder 24 is fixedly connected to the frame 17 through the scraper fixing frame 23. The other end of the scraper position adjustment cylinder 24 is fixedly connected to one end of the scraper force adjustment cylinder 22. The other end of the scraper force adjustment cylinder 22 is fixedly connected to one end of the scraper blade. The other end of the scraper blade extends toward the liquid roller 19.

[0033] In this embodiment, the amount of sodium alginate solution adhering to the surface of the liquid-carrying roller 19 is controlled by the scraper mechanism 21. The distance between the scraper and the liquid-carrying roller 19 can be flexibly adjusted by the scraper position adjustment cylinder 24, and the scraper force adjustment cylinder 22 can precisely control the scraping pressure to avoid damage to the roller surface or incomplete scraping. The scraper can efficiently scrape off excess solution from the roller surface, ensuring uniform distribution of solution on the roller surface, thereby ensuring consistent sizing on the nonwoven fabric 26 and guaranteeing the uniformity of the subsequent reaction with calcium chloride. This avoids differences in the product's moisture absorption and flame retardant properties due to uneven solution adhesion, thus contributing to quality control in industrial production.

[0034] Example 6 The difference between this embodiment and Example 1 is that the concentration of sodium alginate solution in this embodiment is 0.2 wt%. All other conditions are the same as in Example 1.

[0035] Example 7 The difference between this embodiment and Example 1 is that the concentration of sodium alginate solution in this embodiment is 0.3 wt%. All other conditions are the same as in Example 1.

[0036] Comparative Example 1 The difference between this comparative example and Example 1 is that the sodium alginate solution soaking and calcium chloride solution spraying were omitted. All other conditions were the same as in Example 1.

[0037] Comparative Example 2 The difference between this comparative example and Example 1 is that the concentration of the sodium alginate solution is 0.01 wt%. All other conditions are the same as in Example 1.

[0038] Comparative Example 3 The difference between this comparative example and Example 1 is that the nonwoven fabric 26 after the compression treatment has a roll-out rate of 30%. All other conditions are the same as in Example 1.

[0039] Comparative Example 4 The difference between this comparative example and Example 1 is that the concentration of the calcium chloride solution is 0.05 wt%. All other conditions are the same as in Example 1.

[0040] Experimental Example In this experiment, the moisture absorption rate and limiting oxygen index of the spunlace nonwoven fabric 26 prepared in Examples 1, 6, 7 and Comparative Examples 1-4 were tested. The test conditions were kept consistent, and each sample was tested 10 times. The average value was taken. The results are shown in Table 1.

[0041] Table 1. Performance test results of the spunlace nonwoven fabrics prepared in Examples 1, 6, 7 and Comparative Examples 1-4

[0042] The following conclusions can be drawn from the results in Table 1: Comparing Examples 1, 6, and 7 with Comparative Examples 1 and 2, it can be seen that the Lyocell spunlace nonwoven fabric without sodium alginate solution impregnation and calcium chloride solution spraying has a low moisture absorption rate and a low limiting oxygen index (LOI), thus lacking flame retardant properties. The Lyocell spunlace nonwoven fabric prepared using the method of this patent shows improvements in both moisture absorption rate and LOI to a certain extent. In particular, the Lyocell nonwoven fabrics prepared in Examples 1, 6, and 7 all have LOIs higher than 27%, exhibiting good flame retardant properties. Furthermore, with the increase of sodium alginate solution concentration, both the moisture absorption rate and LOI of the nonwoven fabric gradually increase. However, in Comparative Example 2, due to the excessively low sodium alginate solution concentration, the sodium alginate content in the nonwoven fabric after impregnation and sizing is low. Subsequently, the content of calcium alginate adhering to the Lyocell nonwoven fabric after calcium chloride solution spraying is also correspondingly reduced, resulting in limited improvement in the moisture absorption rate and flame retardant properties of the nonwoven fabric.

[0043] Comparing Example 1 and Comparative Example 3, it can be seen that when the roll-out rate of the nonwoven fabric after the compression treatment is low (Comparative Example 3), the sodium alginate content attached to the nonwoven fabric is low, and the calcium alginate content formed after the calcium chloride solution spray treatment will also be reduced accordingly. This not only weakens the moisture absorption improvement effect of the nonwoven fabric, but also reduces its flame retardant performance, ultimately preventing the nonwoven fabric from having the ideal flame retardant effect.

[0044] Comparing Example 1 and Comparative Example 4, it can be seen that when the calcium chloride concentration is low (Comparative Example 4), the sodium alginate on the nonwoven fabric after sizing and impregnation cannot fully react to form calcium alginate, which not only easily causes sodium alginate loss, but also reduces the moisture absorption and flame retardant effect of the final nonwoven fabric.

[0045] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this utility model.

Claims

1. A system for the industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric, characterized in that: The system includes an opening machine (1), a carding machine (2), a web laying machine (3), a hydroentangling machine (4), a sizing device (5) for impregnating nonwoven fabric (26) with sodium alginate solution, a spraying device (6), and a drying device (7), which are connected end to end in sequence. The spraying device (6) includes a calcium chloride solution spraying mechanism (8) and a spraying water mechanism (9). The calcium chloride solution spraying mechanism (8) is located on the side near the sizing device (5), and the spraying water mechanism (9) is located on the side near the drying device (7). A tumble dryer (10) is provided between the sizing device (5) and the calcium chloride solution spraying mechanism (8), and between the calcium chloride solution spraying mechanism (8) and the spraying water mechanism (9).

2. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric according to claim 1, characterized in that: The bottom of the rolling mill (10) is provided with a recycling tank (11).

3. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric according to claim 2, characterized in that: The rolling mill (10) includes a frame two (12), a support roller (13), a rolling mill (14), and a guide roller (15). The support roller (13), the rolling mill (14), and the guide roller (15) are arranged parallel to each other in the horizontal direction inside the frame two (12). The two ends of the support roller (13), the rolling mill (14), and the guide roller (15) are rotatably connected to the frame two (12). The rolling mill (14) is located above the support roller (13). The rolling mill (14) and the support roller (13) are in clearance fit. The guide roller (15) is located on one side of the support roller (13).

4. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric according to claim 3, characterized in that: The recycling trough (11) is located at the bottom of the idler roller (13).

5. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric according to claim 1, characterized in that: The spray water mechanism (9) and the drying device (7) are equipped with a vacuum water suction device (16).

6. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric according to claim 1, characterized in that: The sizing device (5) includes a frame (17), a sizing tank (18) containing sodium alginate solution, a liquid roller (19) that drives the sodium alginate solution to wet the nonwoven fabric (26), and a sizing pressure roller (20) that presses the nonwoven fabric (26) in the direction of travel to make the nonwoven fabric (26) contact the liquid roller (19). The sizing tank (18) is located inside the frame (17). The two ends of the liquid roller (19) and the sizing pressure roller (20) are rotatably connected to the frame (17). The lower part of the liquid roller (19) is immersed in the sodium alginate solution in the sizing tank (18). The liquid roller (19) and the sizing pressure roller (20) are arranged in parallel in the horizontal direction. The sizing pressure roller (20) is located above the liquid roller (19) and is in clearance fit with the liquid roller (19).

7. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric according to claim 6, characterized in that: A scraper mechanism (21) for scraping off excess sodium alginate solution is also provided on one side of the liquid roller (19).

8. The system for industrial production of moisture-absorbing and flame-retardant lyocell spunlace nonwoven fabric according to claim 7, characterized in that: The scraper mechanism (21) includes a scraper force adjustment cylinder (22), a scraper fixing frame (23), a scraper position adjustment cylinder (24), and a scraper (25). One end of the scraper position adjustment cylinder (24) is fixedly connected to the frame (17) through the scraper fixing frame (23). The other end of the scraper position adjustment cylinder (24) is fixedly connected to one end of the scraper force adjustment cylinder (22). The other end of the scraper force adjustment cylinder (22) is fixedly connected to one end of the scraper (25). The other end of the scraper (25) extends toward the liquid roller (19).

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