Preparation method of cellulose spunlace non-woven fabric capable of being ultrasonically compounded

Abstract

The invention discloses a preparation method of cellulose spunlace non-woven fabric capable of being ultrasonically compounded. Through gradient distribution design of chopped fibers and conventional fibers in fiber mixing, carding entanglement is reduced, gram weight uniformity is improved, an efficient antibacterial system is formed by combining a core-shell structure of the antibacterial composite fibers and dual treatment of nano-silver and an ultraviolet-inorganic silver antibacterial agent, meanwhile, a gradient spunlace process and ultrasonic composite synergistic effect are achieved, and the antibacterial performance is improved. The non-woven fabric has antibacterial property, mechanical property and liquid barrier property; secondly, the adjusting assembly drives a moving plate through an air cylinder, the material tension is dynamically adjusted in cooperation with an inclined groove and a push-pull strip structure, welding defects are avoided, and the interlayer bonding quality is remarkably improved; and finally, the aligning assembly drives a rotating plate through a servo motor, material width self-adaptive positioning is achieved through linkage of a telescopic strip-shaped piece and a limiting groove, the conveying accuracy is ensured, mutual noninterference with the adjusting assembly is achieved, and the structural stability and production efficiency of the non-woven fabric are jointly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cellulose spunlace non-woven fabric preparation, in particular to a preparation method of ultrasonic composite cellulose spunlace non-woven fabric. BACKGROUND

[0002] Spunlace non-woven fabric, also known as jet-laying fabric, is a non-woven material in which the fiber web is entangled and reinforced by high-pressure fine water jet. The raw materials include conventional fibers such as polyester, nylon, polypropylene, and viscose fibers, as well as differentiated fibers such as chitin fiber, ultra-fine fiber, tencel, silk, bamboo fiber, wood pulp fiber, and seaweed fiber. The production process uses a spunlace machine to spray the fiber web, and the fiber displacement and entanglement are achieved by water rebound, which has the characteristics of flexible processing.

[0003] At present, cellulose fiber, as a renewable resource with great potential, is receiving more and more attention. Cellulose fiber not only has a wide source and low cost, but also has good biodegradability and renewability, making it an ideal material to replace traditional petroleum-based fibers. By using cellulose fiber to prepare non-woven fabric products, the dependence on non-degradable plastics can be reduced, thereby reducing environmental pollution, promoting green and low-carbon development, and enhancing the environmental competitiveness of the market.

[0004] The existing application number CN202010106138.5, a medical mask material based on spunlace non-woven material and its preparation method, includes an outer protective layer, an adhesive layer, and a spunlace non-woven fabric layer treated with water, oil, blood, and alcohol resistance. The outer protective layer is a PTFE film, and the spunlace non-woven fabric layer is made of bamboo pulp fiber and antibacterial polyester fiber. The preparation method is as follows: the preparation of the spunlace non-woven fabric layer: mix bamboo pulp fiber and polyester fiber in proportion, then card, lay, stretch, and high-pressure spunlace. After four-antibody finishing, high-temperature drying and sterilization, slitting, and winding, the spunlace non-woven fabric layer is obtained. The outer protective layer is overlaid: the adhesive is coated on the surface of the spunlace non-woven fabric layer, and then the PTFE film is overlaid. After heating and rolling, the final material is obtained.

[0005] The above-mentioned spunlace non-woven material does not have any rolling point, has soft hand feeling and good air permeability, and is comfortable to wear while having good protection. However, in the production process, it needs to use glue or manual sewing to prepare non-woven fabric, which not only increases the production cost, but also may introduce pollution problems of chemical adhesives, thus affecting the wide application of cellulose spunlace non-woven fabric in efficient and environmentally friendly production. SUMMARY

[0006] The present application aims to provide a preparation method of ultrasonic composite cellulose spunlace non-woven fabric to solve the problems raised in the background art.

[0007] In order to achieve the above object, the present application adopts the following technical scheme: a preparation method of ultrasonic composite cellulose spunlace non-woven fabric, comprising the following steps: S1, fiber mixing: mixing cellulose fiber and polyvinyl chloride fiber in a high-speed fiber mixing machine to form component A, the rotation speed is 1000-1200 rpm, and the mixing time is 10-15 min; S2, preparation of antibacterial composite fiber: placing the antibacterial composite fiber raw material into a melt spinning machine, conveying the molten material to a spinning assembly through an internal threaded extruder to obtain antibacterial fiber filaments, the spinning temperature is controlled at 180-210℃, and the obtained antibacterial fiber filaments are subjected to ultraviolet irradiation for 4-6h and inorganic silver-based antibacterial agent immersion treatment; S3, web forming and reinforcing: after web forming of component A and antibacterial composite fiber by a double-doffer carding machine, feeding into a flat screen-drum composite spunlace equipment, and performing spunlace reinforcement through staggered arrangement of water spray holes to obtain primary spunlace non-woven fabric; S4, ultrasonic compounding: after the two layers of primary non-woven fabric are overlapped, placing them into an ultrasonic welding machine to make the inner skin layer of the new antibacterial composite fiber melt to form molecular chain combination, and obtaining ultrasonic composite non-woven fabric with gradient structure; S5, drying and calendering: treating the obtained ultrasonic composite non-woven fabric through a hot air oven and a calender to control the internal moisture of the finished non-woven fabric, and finally obtaining cellulose spunlace non-woven fabric with antibacterial performance and mechanical performance.

[0008] Preferably, the cellulose fiber in step S1 is mixed and spun from 1-5mm chopped fiber and 20-25mm conventional fiber.

[0009] Preferably, the antibacterial composite fiber raw material in step S2 is composed of polycaprolactone skin layer and polybutylene succinate core layer, and the polycaprolactone skin layer has nano-silver particles added inside, and the polybutylene succinate core layer contains tributyl citrate.

[0010] Preferably, the ultrasonic welding machine used in step S4 comprises a machine body, a welding receiving plate is arranged at the upper end of the machine body, a vertical column is connected to the upper end of the machine body, a lock piece is locked outside the upper end of the vertical column, the lock piece is installed on the rear side of the ultrasonic welding machine body, the ultrasonic welding machine body is connected to the upper end of the vertical column, an ultrasonic welding head is arranged at the bottom of the ultrasonic welding machine body, a bracket is bolted to the right side of the machine body, a winding roller is installed on the front side of the bracket, a motor is connected to the rear side of the winding roller, and a tensioning and positioning device is arranged on the top of the welding receiving plate.

[0011] Preferably, the tensioning and positioning device includes a base plate, the bottom of which is connected to a welding support plate, the two sides of which are connected to support blocks, and the support blocks are arranged along the four sides of the upper end of the welding support plate. The tops of the front and rear support blocks are rotatably connected to connecting strips, and guide rollers are provided on both the left and right sides of the connecting strips. An adjustment component is provided on the upper end of the base plate, and an alignment component is provided between the left and right connecting strips.

[0012] Preferably, the adjusting component includes a cylinder, the bottom of which is connected to the base plate and the upper end of which is connected to the connecting block. The connecting block is fixed to the upper side of the movable plate. Both sides of the movable plate are slidably connected to the limiting strips, and the bottom of the limiting strips on both sides are fixed to the base plate. Push-pull strips are slidably inserted into both sides of the movable plate, and the push-pull strips are laterally movably inserted into the fixing block inside. The side of the push-pull strip away from the movable plate is inserted into the swing arm, and the upper end of the swing arm is connected to the support block through a rotating shaft. The end of the rotating shaft away from the swing arm is connected to the connecting strip.

[0013] Preferably, the alignment component includes a servo motor, which is installed inside the welding receiving plate. The top output end of the servo motor is connected to the middle of the rotating plate. Connecting arms are rotatably connected to both sides of the upper end of the rotating plate, and the end of the connecting arm away from the rotating plate is rotatably connected to the telescopic strip. Limiting grooves are provided on both the left and right sides of the telescopic strip. A slider is slidably embedded in the limiting groove. A connecting shaft is inserted into the slider, and the end of the connecting shaft away from the slider is connected to the vertical plate. The upper end of the vertical plate is fixedly connected to the positioning plate, and the positioning plate is slidably sleeved on the outside of the guide roller.

[0014] Preferably, the connecting strip is rotatably connected to the front and rear ends of the guide rollers on both sides, and there is a gap between the left and right adjacent guide rollers.

[0015] Preferably, inclined grooves are provided on both sides of the upper end of the movable plate, and the inclined grooves on both sides of the movable plate are slidably connected to the push-pull strip.

[0016] Preferably, the telescopic strip extends upward on both the left and right sides, and a limiting groove is vertically formed at the extension of the telescopic strip on both the left and right sides.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves a comprehensive improvement in the performance of nonwoven fabrics through steps such as fiber mixing, preparation of antibacterial composite fibers, web reinforcement, ultrasonic composite, and drying and calendering. In the fiber mixing stage, the synergistic effect of chopped fibers and conventional fibers reduces fiber entanglement during the carding process and improves the uniformity of nonwoven fabric weight. At the same time, short fibers fill the gaps between long fibers to form a dense network, while long fibers provide skeletal support, significantly enhancing longitudinal tensile strength. In the preparation of antibacterial composite fibers, the core-shell structure design of the polycaprolactone skin layer and the polybutylene succinate core layer, combined with the dual treatment of nano-silver particles and ultraviolet light and inorganic silver-based antibacterial agents, forms a highly efficient antibacterial system. Moreover, the low-temperature melting characteristics of polycaprolactone prevent the high-temperature deactivation of nano-silver. The synergistic effect of gradient hydroentangling process and ultrasonic composite makes the surface layer of the nonwoven fabric form a dense structure to provide liquid barrier properties. The middle layer is enhanced by ultrasonic welding to strengthen the interlayer bonding force, and the bottom layer retains a loose structure to ensure air permeability. Finally, a cellulose hydroentangled nonwoven fabric with both antibacterial and mechanical properties is prepared.

[0018] 2. This invention incorporates an adjustment component. When insufficient tension occurs during material transfer, a cylinder lifts the moving plate. The inclined grooves on both sides of the moving plate, together with the push-pull strip, form a lateral movement adjustment structure. This causes the push-pull strip to pull the swing arm, which in turn drives the connecting strip and guide roller to rotate circumferentially, thereby tightening the transferred material and ensuring improved material stacking density. The setting of the limiting strip ensures the guidance and limitation of the vertical movement of the moving plate, avoiding deviations during the adjustment process. This achieves uniform tension of the material during ultrasonic welding, preventing welding defects caused by uneven tension and improving the firmness of the interlayer bonding of the nonwoven fabric and the overall quality.

[0019] 3. This invention, by setting up an alignment component, specifically, when the rotating plate is driven by a servo motor, the connecting arm pulls the telescopic strip. This, combined with the sliding connection design of the limiting groove and the slider, and the docking of the connecting shaft and the vertical plate, pushes the positioning plate to move synchronously. This allows for flexible adjustment of the positioning and conveying distance between the front and rear positioning plates, adapting to the positioning and alignment conveying requirements of materials of different widths. Furthermore, during material conveying, the limiting and counteracting effect of the positioning plate on the material's sides ensures the material's positioning and alignment. This component and the adjustment component do not interfere with each other, jointly realizing the tension adjustment and positioning conveying of the material during ultrasonic welding, avoiding welding misalignment caused by material displacement, and improving the structural stability and production efficiency of the nonwoven fabric. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the preparation process of the present invention; Figure 2 This is a schematic diagram of the ultrasonic welding machine of the present invention; Figure 3 This is a schematic diagram of the tensioning and positioning device of the present invention; Figure 4This is a three-dimensional structural diagram of the tensioning and positioning device of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the adjustment component of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the adjustment component of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the alignment component of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Machine body, 2. Welding receiving plate, 3. Column, 4. Locking device, 5. Ultrasonic welding machine body, 6. Ultrasonic welding head, 7. Bracket, 8. Motor, 9. Winding roller, 10. Tensioning and positioning device, 10. Base plate, 101. Support block, 102. Connecting strip, 103. Guide roller, 104. Adjustment component, 105. Cylinder, 1051. Connecting block, 1052. Moving plate, 1053. Limiting strip, 1054. Push-pull strip, 1055. Fixing block, 1056. Swing arm, 1057. Rotating shaft, 1058. Alignment component, 106. Servo motor, 1061. Rotating plate, 1062. Connecting arm, 1063. Telescopic strip, 1064. Limiting groove, 1065. Slider, 1066. Connecting shaft, 1067. Vertical plate, 1068. Positioning plate, 1069. Detailed Implementation

[0022] To further explain the technical solution of the present invention, a detailed description is provided below through specific embodiments.

[0023] Please see Figure 1 The present invention provides a method for preparing an ultrasonically composite cellulose spunlace nonwoven fabric, comprising the following steps; S1. Fiber mixing: Mix cellulose fibers and polyvinyl chloride fibers in a high-speed fiber mixer to form component A. The speed is 1000-1200 rpm and the mixing time is 10-15 min. S2. Preparation of antibacterial composite fiber: The antibacterial composite fiber raw material is put into a melt spinning machine, and the molten material is conveyed to the spinneret through an internal thread extruder to obtain antibacterial fiber filaments. The spinning temperature is controlled at 180-210℃, and the obtained antibacterial fiber filaments are treated with ultraviolet irradiation for 4-6 hours and soaked in an inorganic silver-based antibacterial agent. S3. Web Formation and Reinforcement: After component A and antibacterial composite fibers are web-formed by a double doffer carding machine, they are fed into a flat web-rotary drum composite hydroentanglement equipment and reinforced by hydroentanglement through staggered water jet holes to obtain primary hydroentangled nonwoven fabric. S4. Ultrasonic composite: Two layers of primary nonwoven fabric are stacked and then placed into an ultrasonic welding machine to melt the inner skin of the novel antibacterial composite fiber to form molecular chain bonding, resulting in an ultrasonic composite nonwoven fabric with a gradient structure. S5. Drying and Calendering: The obtained ultrasonic composite nonwoven fabric is processed by hot air drying oven and calendering machine to control the internal moisture of the finished nonwoven fabric, and finally obtains cellulose spunlace nonwoven fabric with both antibacterial and mechanical properties.

[0024] The cellulose hydroentangled nonwoven fabric prepared through the above preparation steps has the following characteristics: 1. Highly efficient antibacterial properties: The dual treatment of nano-silver with ultraviolet light and inorganic silver-based antibacterial agents forms a synergistic antibacterial system. The low-temperature melting characteristics of the polycaprolactone coating can prevent the nano-silver from being deactivated at high temperatures. 2. Enhanced mechanical properties: The high strength of polyvinyl chloride fiber and the flexibility of polycaprolactone skin jointly enhance mechanical properties, improving tensile strength while maintaining good impact resistance; 3. Synergistic effect of gradient hydroentangling process and ultrasonic composite: The dense surface structure is formed by high-pressure hydroentangling, providing liquid barrier; the middle transition structure is enhanced by ultrasonic welding to strengthen the interlayer bonding; the loose bottom structure is retained by low-pressure hydroentangling to ensure air permeability; In step S1, the cellulose fiber is woven from a mixture of 1-5mm chopped fibers and 20-25mm conventional fibers. The mixing of chopped fibers and conventional fibers can reduce fiber entanglement during the combing process and improve the uniformity of nonwoven fabric weight. At the same time, the short fibers fill the gaps between the long fibers to form a denser network structure, while the long fibers provide skeletal support, thereby improving the longitudinal tensile strength of the nonwoven fabric.

[0025] In step S2, the antibacterial composite fiber raw material is composed of a polycaprolactone sheath and a polybutylene succinate core. The polycaprolactone sheath contains nano-silver particles, and the polybutylene succinate core contains tributyl citrate. The gradient length distribution of cellulose fibers and the core-shell structure of the antibacterial composite fiber work together to form a three-functional gradient nonwoven fabric with an antibacterial surface, a transitional middle layer, and a supportive bottom layer.

[0026] Please see Figure 2 In step S4 of this embodiment, the ultrasonic welding machine includes a body 1, a welding receiving plate 2 is provided on the upper end of the body 1, a column 3 is vertically connected to the upper end of the body 1, a locking piece 4 is externally locked on the upper end of the column 3, the locking piece 4 is installed on the rear side of the ultrasonic welding machine body 5, the ultrasonic welding machine body 5 is connected to the upper end of the column 3, an ultrasonic welding head 6 is provided at the bottom of the ultrasonic welding machine body 5, a bracket 7 is bolted to the right side of the body 1, a winding roller 9 is installed on the front side of the bracket 7, a motor 8 is connected to the rear side of the winding roller 9, and a tensioning and positioning device 10 is provided on the top of the welding receiving plate 2.

[0027] Please see Figures 3-4 The tensioning and positioning device 10 includes a base plate 101, the bottom of which is connected to the welding support plate 2, and the two sides of the base plate 101 are connected to the support blocks 102. The support blocks 102 are arranged along the four sides of the upper end of the welding support plate 2. The top of the front and rear support blocks 102 are rotatably connected to the connecting strips 103. Guide rollers 104 are provided on both the left and right sides of the connecting strips 103. An adjustment component 105 is provided on the upper end of the base plate 101, and an alignment component 106 is provided between the left and right connecting strips 103.

[0028] The connecting strip 103 is rotatably connected to the front and rear ends of the guide rollers 104 on both sides, and there is a gap between the left and right adjacent guide rollers 104, which satisfies the feeding and conveying of nonwoven fabric and subsequent tension adjustment. Please see Figures 5-6 The adjusting component 105 includes a cylinder 1051. The bottom of the cylinder 1051 is connected to the middle of the base plate 101, and the upper end of the cylinder 1051 is connected to the connecting block 1052. The rear side of the connecting block 1052 is fixed to the upper side of the moving plate 1053. The left and right sides of the moving plate 1053 are slidably connected to the limiting strips 1054, and the bottom of the limiting strips 1054 on both sides is fixed to the base plate 101. In this way, the vertical movement of the moving plate 1053 is guided and limited. Push-pull strips 1055 are slidably inserted into the left and right sides of the moving plate 1053, and the push-pull strips 1055 are laterally movably inserted into the fixing block 1056. The side of the push-pull strip 1055 away from the moving plate 1053 is inserted into the swing arm 1057, and the upper end of the swing arm 1057 is connected to the support block 102 through the rotating shaft 1058. The end of the rotating shaft 1058 away from the swing arm 1057 is connected to the connecting strip 103.

[0029] The movable plate 1053 has inclined grooves on both sides of its upper end, and the inclined grooves on both sides of the movable plate 1053 are slidably connected to the push-pull strip 1055, that is, the inclined grooves on both sides of the movable plate 1053 and the push-pull strip 1055 together form a horizontal movement adjustment structure.

[0030] Please see Figures 7-8 The alignment component 106 includes a servo motor 1061, which is installed inside the welding receiving plate 2. The top output end of the servo motor 1061 is connected to the middle of the rotating plate 1062. Connecting arms 1063 are rotatably connected to both the front and rear sides of the upper end of the rotating plate 1062. The ends of the connecting arms 1063 away from the rotating plate 1062 are rotatably connected to the inner side of the middle of the telescopic strip 1064. Limiting grooves 1065 are opened at both ends of the telescopic strip 1064. A slider 1066 is slidably embedded in the limiting groove 1065. A connecting shaft 1067 is inserted into the slider 1066. The end of the connecting shaft 1067 away from the slider 1066 is connected to the vertical plate 1068. The upper end of the vertical plate 1068 is fixedly connected to the positioning plate 1069. The positioning plate 1069 is slidably sleeved on the outside of the guide roller 104.

[0031] The telescopic strip 1064 extends upward on both sides, and a limiting groove 1065 is vertically provided at the extension of the telescopic strip 1064 on both sides. In this way, with the vertical guidance of the limiting groove 1065, the slider 1066 slides up and down along the limiting groove 1065 when it is adjusted by the circumferential swing of the vertical plate 1068, and the telescopic strip 1064 contracts or is pulled.

[0032] The working principle of the ultrasonic welding machine in this embodiment is as follows: First, place the material to be ultrasonically composite welded on the upper end of the welding receiving plate 2, and make one side of the material contact the take-up roller 9. With the help of the motor 8, drive the take-up roller 9 to realize the take-up and pull of the material. At this time, manually adjust the position of the ultrasonic welding machine body 5 and the ultrasonic welding head 6 so that the ultrasonic welding head 6 contacts the material to be composited and performs ultrasonic welding composite to composite the two layers of materials with high strength. Secondly, before the ultrasonic welding composite of the material is conveyed, the material is passed between the two pairs of guide rollers 104 on the left and right sides to achieve auxiliary material conveying and improve the smoothness of the conveying. When the material is conveyed during the ultrasonic welding process, if the material tension is insufficient, the material stacking tightness will be reduced, affecting the ultrasonic welding quality of the material. Then, the cylinder 1051 can be operated to lift the connecting block 1052 and the moving plate 1053. Through the inclined grooves opened on both sides of the moving plate 1053 and the limiting strips 1054 on both sides, the push-pull strips 1055 on both sides move laterally relative to each other to pull the swing arm 1057 on the other side. In this way, the swing arms 1057 on both sides will swing in opposite directions and cooperate with the rotating shaft 1058 connected at the upper end to realize the circumferential rotation of the connecting strips 103 and the guide rollers 104 on both sides, that is, to tighten the ultrasonic welding material being conveyed, strengthen the material stacking tightness, and ensure the high-quality ultrasonic welding composite of the material. Third, to enhance the accuracy of material conveying and reduce material conveying deviation, the positioning plate 1069, which is movable outside the guide roller 104, is used to limit and abut against the material, ensuring that the material is positioned and that it is not easily deviated when it is conveyed to the welding receiving plate 2, thus ensuring the subsequent welding quality. If it is necessary to adjust the distance between the front and rear positioning plates 1069 to achieve positioning and conveying of materials of different widths, the servo motor 1061 is used to rotate the rotating plate 1062 clockwise. At this time, the connecting arms 1063 on both sides of the rotating plate 1062 will pull the telescopic strips 1064 on both sides. The sliders 1066 connected at the limiting grooves 1065 at the left and right ends of the telescopic strips 1064 will cooperate with the docking effect of the connecting shaft 1067 and the vertical plate 1068 to achieve synchronous movement of the positioning plate 1069, that is, to drive the positioning plate 1069 to move back and forth along the outside of the guide roller 104, so that the distance between the front and rear positioning plates 1069 can be flexibly adjusted to adapt to the positioning and alignment conveying requirements of materials of different widths. Fourth, since the telescopic strip 1064 can be extended and retracted on both the left and right sides, and the telescopic strip 1064 is connected to the slider 1066 by the limiting groove 1065, when the connecting strip 103 and the guide roller 104 are adjusted by circumferential rotation, the externally connected positioning plate 1069 and the vertical plate 1068 can be moved circumferentially at the same time. When the vertical plate 1068 moves circumferentially, it can push the slider 1066 through the connecting shaft 1067 connected at the bottom, so that the slider 1066 moves up or down along the inside of the limiting groove 1065 and at the same time the telescopic strip 1064 is squeezed, contracted or pulled outward. Thus, the operation of the adjustment component 105 and the alignment component 106 does not interfere with each other, and the material tension adjustment and positioning alignment conveying effect are stably achieved, which greatly enhances the stable achievement of the ultrasonic composite welding effect of the material.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing ultrasonically composited cellulose spunlace nonwoven fabric, characterized in that: Includes the following steps; S1. Fiber mixing: Cellulose fibers and polyvinyl chloride fibers are mixed in a high-speed fiber mixer to form component A. The speed is 1000-1200 rpm and the mixing time is 10-15 min. S2. Preparation of antibacterial composite fiber: The antibacterial composite fiber raw material is put into a melt spinning machine, and the molten material is conveyed to the spinneret through an internal thread extruder to obtain antibacterial fiber filaments. The spinning temperature is controlled at 180-210℃, and the obtained antibacterial fiber filaments are treated with ultraviolet irradiation for 4-6 hours and soaked in an inorganic silver-based antibacterial agent. S3. Web Formation and Reinforcement: After component A and antibacterial composite fibers are web-formed by a double doffer carding machine, they are fed into a flat web-rotary drum composite hydroentanglement equipment and reinforced by hydroentanglement through staggered water jet holes to obtain primary hydroentangled nonwoven fabric. S4. Ultrasonic composite: Two layers of primary nonwoven fabric are stacked and then placed into an ultrasonic welding machine to melt the inner skin of the novel antibacterial composite fiber to form molecular chain bonding, resulting in an ultrasonic composite nonwoven fabric with a gradient structure. S5. Drying and Calendering: The obtained ultrasonic composite nonwoven fabric is processed by hot air drying oven and calendering machine to control the internal moisture of the finished nonwoven fabric, and finally obtains cellulose spunlace nonwoven fabric with both antibacterial and mechanical properties.

2. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 1, characterized in that: The cellulose fiber in step S1 is woven from a mixture of 1-5 mm short-cut fibers and 20-25 mm conventional fibers.

3. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 1, characterized in that: The antibacterial composite fiber raw material in step S2 is composed of a polycaprolactone outer layer and a polybutylene succinate core layer, with nano-silver particles added inside the polycaprolactone outer layer and tributyl citrate inside the polybutylene succinate core layer.

4. The method for preparing an ultrasonically compositeable cellulose hydroentangled nonwoven fabric according to claim 1, characterized in that: The ultrasonic welding machine used in step S4 includes a machine body (1), a welding receiving plate (2) is provided on the upper end of the machine body (1), a column (3) is vertically connected to the upper end of the machine body (1), a locking piece (4) is locked on the upper end of the column (3), the locking piece (4) is installed on the rear side of the ultrasonic welding machine body (5), the ultrasonic welding machine body (5) is connected to the upper end of the column (3), an ultrasonic welding head (6) is provided at the bottom of the ultrasonic welding machine body (5), a bracket (7) is bolted to the right side of the machine body (1), a winding roller (9) is installed on the front side of the bracket (7), a motor (8) is connected to the rear side of the winding roller (9), and a tensioning and positioning device (10) is provided on the top of the welding receiving plate (2).

5. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 4, characterized in that: The tensioning and positioning device (10) includes a base plate (101), the bottom of which is connected to the welding support plate (2), the two sides of which are connected to the support blocks (102), and the support blocks (102) are arranged along the four sides of the upper end of the welding support plate (2). The top of the front and rear support blocks (102) is rotatably connected to the connecting strip (103), and guide rollers (104) are provided on both the left and right sides of the connecting strip (103). An adjustment component (105) is provided on the upper end of the base plate (101), and an alignment component (106) is provided between the left and right connecting strips (103).

6. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 5, characterized in that: The adjusting assembly (105) includes a cylinder (1051), the bottom of which is connected to the base plate (101), and the upper end of which is connected to the connecting block (1052). The connecting block (1052) is fixed to the upper side of the moving plate (1053). The left and right sides of the moving plate (1053) are slidably connected to the limiting strips (1054), and the bottom of the limiting strips (1054) on both sides is fixed to the base plate (101). Push-pull strips (1055) are slidably inserted on both the left and right sides of the plate (1053), and the push-pull strips (1055) are laterally movably inserted into the fixing block (1056) inside. The side of the push-pull strip (1055) away from the moving plate (1053) is inserted into the swing arm (1057), and the upper end of the swing arm (1057) is connected to the support block (102) through the pivot (1058). The end of the pivot (1058) away from the swing arm (1057) is connected to the connecting strip (103).

7. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 5, characterized in that: The alignment component (106) includes a servo motor (1061), which is installed inside the welding support plate (2). The top output end of the servo motor (1061) is connected to the middle of the rotating plate (1062). Connecting arms (1063) are rotatably connected to both sides of the upper end of the rotating plate (1062), and the end of the connecting arm (1063) away from the rotating plate (1062) is rotatably connected to the telescopic strip (1064). 064) Limiting grooves (1065) are provided on both the left and right sides. A slider (1066) is slidably embedded in the limiting groove (1065). A connecting shaft (1067) is inserted into the slider (1066). The end of the connecting shaft (1067) away from the slider (1066) is connected to the vertical plate (1068). The upper end of the vertical plate (1068) is fixedly connected to the positioning plate (1069). The positioning plate (1069) is slidably sleeved on the outside of the guide roller (104).

8. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 5, characterized in that: The connecting strip (103) is rotatably connected to the front and rear ends of the guide rollers (104) on both sides, and there is a gap between the left and right adjacent guide rollers (104).

9. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 6, characterized in that: The upper sides of the movable plate (1053) are provided with inclined grooves, and the inclined grooves on both sides of the movable plate (1053) are slidably connected to the push-pull strip (1055).

10. The method for preparing an ultrasonically compositeable cellulose spunlace nonwoven fabric according to claim 7, characterized in that: The telescopic strip (1064) extends upward on both the left and right sides, and a limiting groove (1065) is vertically opened at the extension of the telescopic strip (1064) on both the left and right sides.

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