Method and equipment for preparing continuous cellulose fiber non-woven fabric

Abstract

The invention provides a method and equipment for preparing continuous cellulose fiber non-woven fabric. The equipment at least comprises a group of spinning components, a coagulating bath tank and a lapping machine which are arranged in sequence, the lapping machine comprises a swinging lapping section arranged at the wire outlet end of the coagulating bath tank and a conveying section arranged at the wire outlet end of the swinging lapping section; a guide roller is arranged between the filament outlet end of the coagulating bath tank and the swing lapping section, the swing lapping section swings left and right in a reciprocating mode in the axial direction of the guide roller, and filament bundles output from the filament outlet end of the coagulating bath tank are pulled to the swing lapping section through the guide roller to swing and then output from the fiber curtain through the conveying section. The guide roller provides the functions of holding and steering the continuous fiber curtain, so that the fiber can be stably guided to a correct track in a soft state just going out of the coagulating bath tank, and the fiber quality problem caused by deviation or fracture is reduced; the tension and the path are effectively controlled when the guide roller enters and exits from the fiber curtain, so that the fiber curtain is kept uniform in the subsequent lapping process, and the overall quality of non-woven fabric is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fiber cloth making, and particularly relates to a preparation method and equipment of continuous cellulose fiber non-woven cloth. BACKGROUND

[0002] In recent years, non-woven technology has made remarkable progress worldwide, and the application of non-woven cloth has penetrated into various industries. However, the use of a large amount of petroleum-based materials and viscose cellulose fiber non-woven cloth has brought serious ecological and environmental problems due to its "use and discard" characteristics. Therefore, the non-woven cloth production technology using renewable resources as raw materials has become an important symbol of the level of industry technology and the direction of development.

[0003] Lyocell fiber is known as the green fiber of the 21st century due to its excellent mechanical properties, moisture absorption, biodegradability, and environmentally friendly production process. Lyocell fiber has been gradually applied in the field of non-woven cloth and has attracted widespread attention. However, the existing Lyocell fiber non-woven cloth preparation technology still has many challenges in terms of spinning speed, fineness, web uniformity, and transverse strength control.

[0004] For example, patent EP3385425A1 discloses a method of forming Lyocell filament non-woven cloth using air flow drafting. Although this method can achieve rapid formation of the fiber web, it has limitations in the control of spinning speed and fineness, making it difficult to control the weight and uniformity of the web.

[0005] Patent US8303888B2 forms fibers by high-speed air flow drafting of the spinning solution, but the fibers are prone to breakage, making it difficult to form a continuous fiber network, especially when dealing with spinning solutions containing NMMO solvent, the fiber forming process is unstable.

[0006] The process of patent CN201780089369.6 uses a melt blowing method to stretch the fibers, but the fibers prepared by the melt blowing method are mostly discontinuous fibers, making it difficult to achieve a high-strength and high-uniformity fiber web.

[0007] In addition, in the existing technology, the scheme of achieving uniform webbing by mechanical splitting, such as the method disclosed in CN201810209978, is theoretically feasible, but Lyocell fibers have strong water absorption, and the fibers are difficult to separate effectively in the wet state, making it difficult to control the uniformity of the fiber network and the transverse strength, further limiting the adjustability of the web structure and function.

[0008] In summary, the existing non-woven fabric preparation method has the technical problems of difficult to guarantee the weight and uniformity of the web, difficult to achieve the required transverse strength, and lack of effective control ability of the web density and structure. These problems seriously affect the production quality and application effect of Lyocell continuous non-woven fabric, and limit its application in high-performance fields.

[0009] Therefore, the present application is proposed. SUMMARY

[0010] The present application provides a method and equipment for preparing continuous cellulose fiber non-woven fabric to achieve controllable spinning speed, controllable uniformity of fiber diameter and web weight, and high and controllable transverse strength.

[0011] To solve the above technical problems, the basic idea of the technical solution adopted by the present application is:

[0012] A device for preparing continuous cellulose fiber non-woven fabric, comprising at least a set of jetting assemblies, coagulation bath tanks and web laying machines arranged in sequence;

[0013] The web laying machine comprises a swing web laying section arranged at the out-fiber end of the coagulation bath tank and a conveying section arranged at the out-fiber end of the swing web laying section;

[0014] A guide roller is arranged between the out-fiber end of the coagulation bath tank and the swing web laying section, the swing web laying section reciprocally swings left and right along the axial direction of the guide roller, and the fiber bundle output from the out-fiber end of the coagulation bath tank is pulled to the swing web laying section through the guide roller and then output as a fiber curtain by the conveying section after swinging.

[0015] Further, the in-fiber end of the swing web laying section is arranged close to the out-fiber end of the coagulation bath tank, the out-fiber end of the swing web laying section is overlapped with the conveying section, the swing web laying section is arranged from the in-fiber end to the out-fiber end in a self-up-to-down inclined manner, and the guide roller is arranged above the in-fiber end of the swing web laying section.

[0016] Further, the width of the swing web laying section gradually narrows from the in-fiber end to the out-fiber end.

[0017] Preferably, the width of the swing web laying section is greater than or equal to the axial length of the guide roller.

[0018] Further, the guide roller comprises upper and lower guide rollers arranged in parallel and at intervals, the lower guide roller is overlapped with the in-fiber end of the swing web laying section, and the upper guide roller is located above the swing web laying section, the fiber bundle output from the out-fiber end of the coagulation bath tank passes through the gap between the upper and lower guide rollers and enters the swing web laying section.

[0019] Furthermore, there are two vertically arranged mounting frames between the coagulation bath and the oscillating mesh laying section. The two mounting frames are respectively located near the left and right ends of the oscillating mesh laying section. The two ends of the upper and lower guide rollers are respectively set on the two mounting frames, and the distance between the upper and lower guide rollers is adjustable.

[0020] Furthermore, the coagulation bath has left and right side walls arranged opposite to each other, and the bottom wall of the coagulation bath has a liquid outlet extending from the left side wall to the right side wall. The axial extension direction of the guide roller is the same as the extension direction of the liquid outlet.

[0021] Furthermore, it also includes a negative pressure suction device, which includes a box set below the conveying section. The top wall of the box is vertically opposite to the conveying section. A suction port is opened on the top wall of the box, which connects the inside and outside of the box and extends from one end of the top wall to the other. The conveying section has a vent hole. The suction port forms a negative pressure on the lower side of the conveying section. When the filament above the conveying section passes above the suction port, the liquid on the filament enters the box through the vent hole and the suction port.

[0022] Preferably, the housing is located at least below the wire inlet end of the conveying section, and the extension direction of the suction port is perpendicular to the conveying direction of the conveying section.

[0023] Furthermore, the equipment includes several sets of the spinneret assembly, coagulation bath and web laying machine arranged in sequence. The filament outlet end of the conveying section of the preceding web laying machine overlaps with the filament inlet end of the conveying section of the following web laying machine. The fiber curtain output from the conveying section of the preceding web laying machine enters the conveying section of the following web laying machine and is located below the filament bundle output from the following oscillating web laying section to form a double-layer fiber curtain.

[0024] Furthermore, among the several sets of spinnerets, coagulation baths and web laying machines arranged in sequence, at least one set of web laying machine conveying section is provided with an ultra-short fiber adding device for dispensing ultra-short fibers into the conveying section;

[0025] Preferably, the equipment includes two sets of spinnerets, coagulation baths, and web laying machines arranged in sequence. A short fiber adding device is provided above the conveying section of the first web laying machine. The short fiber adding device feeds short fibers onto the fiber curtain on the conveying section of the first web laying machine to form a double-layer fiber curtain. The double-layer fiber curtain enters the conveying section of the second web laying machine. The filament bundles output from the second oscillating web laying section cover the double-layer fiber curtain to form a triple-layer fiber curtain.

[0026] This invention also provides a method for preparing a continuous cellulose fiber nonwoven fabric, using the equipment described in this invention, and the preparation steps include:

[0027] (1) Control the spinning assembly to spin the filaments, and the filament bundle enters the coagulation bath for coagulation;

[0028] (2) After the fiber bundle is output from the coagulation bath, it is pulled to the swinging web laying section by the guide roller. The swinging web laying section is controlled to swing back and forth along the axis of the guide roller to form a fiber curtain with an "S" shaped texture, and is output by the conveying section.

[0029] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0030] The guide rollers provide gripping and steering functions for the continuous fiber curtain, ensuring that the fibers can be steadily guided to the correct trajectory in their soft state immediately after exiting the coagulation bath, reducing fiber quality problems caused by deviation or breakage. Furthermore, the guide rollers effectively control the tension and path when entering and exiting the fiber curtain, ensuring that the fiber curtain remains uniform and consistent during subsequent web laying. In particular, through precise traction and steering operations, the dimensional stability of the fiber curtain in the width direction is guaranteed.

[0031] This invention not only ensures the uniform laying of fiber curtains and improves the overall quality of nonwoven fabrics, but also effectively solves problems such as easy fiber misalignment and uneven width in traditional processes, providing reliable technical support for the production of high-quality continuous cellulose fiber nonwoven fabrics.

[0032] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0033] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0034] Figure 1 A schematic diagram of the assembly structure of a continuous cellulose fiber nonwoven fabric equipment according to the present invention;

[0035] Figure 2 1. A schematic diagram of the assembly structure of another continuous cellulose fiber nonwoven fabric device of the present invention;

[0036] Figure 3 This is a schematic diagram of the assembly structure of another continuous cellulose fiber nonwoven fabric equipment of the present invention;

[0037] Figure 4 The image shown is a texture map of the nonwoven fabric in Embodiment 2 of the present invention.

[0038] Figure 5 The image shown is a texture map of the nonwoven fabric in Embodiment 3 of the present invention.

[0039] In the picture:

[0040] 1. Spinneret assembly; 11. Spinning solution feed pipe; 12. Second set of spinnerets; 2. Coagulation bath; 21. First traction roller; 22. Second traction roller; 23. Bottom wall of coagulation bath; 24. Second set of coagulation bath; 3. Web laying machine; 31. Swinging web laying section; 311. Infeed end of swinging web laying section; 312. Outfeed end of swinging web laying section; 313. Mounting shaft; 32. Conveying section; 33. Second set of swinging web laying section; 331. Second set of swinging web laying section 34. Second conveyor section; 35. First fiber curtain; 36. Second fiber curtain; 37. Third fiber curtain; 4. Guide roller; 41. Upper guide roller; 42. Lower guide roller; 43. Left mounting frame; 44. Right mounting frame; 45. Second guide roller; 5. Negative pressure suction device housing; 51. Suction port; 52. Second negative pressure suction device housing; 53. Third negative pressure suction device housing; 6. Short fiber addition device.

[0041] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Example 1

[0046] like Figures 1 to 3As shown, this embodiment provides an apparatus for producing continuous cellulose fiber nonwoven fabric; the details are as follows:

[0047] The equipment for continuous cellulose fiber nonwoven fabric production includes at least one set of spinneret 1, coagulation bath 2, and web forming machine 3 arranged sequentially. The spinneret 1 consists of key components such as a spinning solution feed pipe 11, a metering pump, a spinneret, a temperature control system, an exhaust system, and a cleaning system. These components are assembled sequentially. The spinning solution feed pipe 11 precisely delivers the cellulose solution from the storage device to the spinneret via the metering pump. The metering pump controls the solution flow rate to ensure fiber fineness and uniformity. The spinneret has a spinneret width of 600mm-3200mm and an orifice capacity of up to 100,000 orifices.

[0048] The spinneret extrudes the solution into fine filaments through precisely designed spinneret orifices. A temperature control system regulates and maintains a stable temperature during the spinning process, an air venting system removes air bubbles to ensure fiber quality, and a cleaning system periodically removes residues to prevent clogging of the spinneret orifices. The coordinated operation of these components allows the cellulose solution to be extruded smoothly under precise control, forming uniform and continuous fibers, providing high-quality raw materials for subsequent processes.

[0049] The filaments ejected from the spinneret 1 enter the coagulation bath 2 located below the spinneret 1. Due to gravity, the ejected liquid filaments naturally droop and directly enter the coagulation bath 2. The top of the coagulation bath 2 is designed to be open and is located directly below the spinneret 1. This design ensures that the filaments can enter the coagulation liquid stably. During this process, the liquid filaments will not sway or deviate before entering the coagulation liquid, thus ensuring the stability and consistency of the fiber forming process.

[0050] The filament bundles solidified in the coagulation bath 2 are drawn to the web laying machine 3. The web laying machine includes a swing web laying section 31 set at the filament outlet end of the coagulation bath 2 and a conveying section 32 set at the filament outlet end of the swing web laying section 31. A guide roller 4 is set between the filament outlet end of the coagulation bath 2 and the swing web laying section 31. The swing web laying section 31 swings back and forth along the axial direction of the guide roller 4. The filament bundles output from the filament outlet end of the coagulation bath 2 are drawn to the swing web laying section 31 by the guide roller 4 and then output as fiber curtains by the conveying section 32.

[0051] After initial solidification, the filament bundles in the coagulation bath 2 are output from the filament outlet. At this point, the guide roller 4 plays a crucial guiding role. The guide roller 4 is arranged along its axial direction to ensure that the filament bundles output from the coagulation bath 2 can smoothly enter the oscillating web laying section 31. Through the traction of the guide roller 4, the filament bundles maintain appropriate tension and direction, preventing deviation or twisting during the transfer process.

[0052] The oscillating web laying segment 31 oscillates back and forth along the axial direction of the guide roller 4. Specifically, the web laying machine 3 includes a mounting shaft 313, the central axis of which is parallel to the central axis of the guide roller 4. The left and right sides of the oscillating web laying segment 31 have mounting holes arranged opposite to each other. The two ends of the mounting shaft 313 are rotatably inserted into the two mounting holes respectively, and the oscillating web laying segment 31 can slide left and right along the axial direction of the mounting shaft 313.

[0053] During the oscillation of the oscillating web-laying section 31, the filaments drawn from the guide roller 4 are evenly distributed on the oscillating web-laying section 31. That is, the reciprocating motion of the oscillating web-laying section 31 ensures the uniform distribution of the filaments in the transverse direction, contributing to the formation of a structurally stable and uniform fiber curtain. After oscillating through the oscillating web-laying section 31, the filaments are evenly spread out, forming a preliminary fiber curtain. These fiber curtains are then output by the conveying section 32, whose function is to stably transport the formed fiber curtains out.

[0054] In this embodiment, the guide roller 4 ensures that the fiber bundle maintains stable tension and direction during the transfer from the coagulation bath to the oscillating web-laying section, preventing fiber bundle deviation or twisting and thus improving the uniformity of the fiber curtain. Secondly, the reciprocating oscillation function of the oscillating web-laying section 31 makes the fiber curtain more evenly distributed in the transverse direction, which not only improves the structural stability of the fiber web but also ensures the uniform thickness and consistency of the final product. Furthermore, the design of the conveying section 32 ensures that the fiber curtain can be smoothly conveyed when entering subsequent processing stages, further ensuring the overall quality and continuity of the fiber curtain.

[0055] In one embodiment of this invention, the oscillating web laying section has an infeed end 311 located near the outlet end of the coagulation bath 2, and an outlet end 312 connected to the conveying section 32. The oscillating web laying section 31 is arranged from top to bottom from the infeed end 311 to the outlet end 312. The guide roller 4 is located above the infeed end 311 of the oscillating web laying section.

[0056] This embodiment optimizes the fiber curtain conveying and web-laying process by rationally arranging the inlet and outlet ends of the oscillating web-laying section 31 and its combination with the conveying section 32 and guide roller 4. The inclined arrangement of the oscillating web-laying section 31 utilizes the natural force of gravity, allowing the fiber curtain to spread downwards more naturally during web-laying. Compared to horizontal web-laying, the inclined arrangement reduces the possibility of uneven stress on the fiber curtain during web-laying, allowing the fibers to be distributed more stably on the oscillating web-laying section. Furthermore, the inclined oscillating web-laying section 31 allows the fiber curtain to droop naturally under gravity, reducing additional mechanical interference and minimizing the impact of external forces on the uniform spread of the fiber curtain. This design is particularly important in improving the uniformity of the fiber web, ensuring the consistency of the final product's quality. Moreover, the inclined oscillating web-laying section 31 helps the fiber curtain to be evenly distributed on the conveying section during oscillation, thereby forming a uniform "S"-shaped texture structure. This texture structure significantly improves the transverse strength of the fiber web, ensuring that the final nonwoven fabric has good mechanical properties and stability.

[0057] The inclined oscillating web-laying section 31 helps the fiber bundle maintain a smooth transition and natural fall after entering the oscillating web-laying section 31 from the guide roller 4, reducing breakage or twisting caused by abrupt changes in the fiber bundle. This is crucial for the subsequent conveying of the fiber curtain and the quality of web laying. Furthermore, the inclined oscillating web-laying section 31 not only contributes to the uniform spreading of the fiber curtain but also improves the efficiency of the web-laying process, adapting to the needs of large-scale continuous production. This is of great significance for increasing production line capacity and reducing production costs.

[0058] As one embodiment of this example, the width of the oscillating web laying section 31 gradually narrows from its oscillating web laying section infeed end 311 to its oscillating web laying section outlet end 312; preferably, the width of the oscillating web laying section is greater than or equal to the axial length of the guide roller.

[0059] In this embodiment, the gradually narrowing width of the oscillating web section 31 helps the filament bundles achieve a smooth transition before entering the conveying section 32, avoiding the phenomenon that the fibers will spread out on the oscillating web section 31 due to its excessive width.

[0060] The design, where the width of the oscillating web-laying section is greater than or equal to the axial length of the guide roller, ensures that the filament bundles are fully spread on the fiber curtain when entering the web-laying section, avoiding fiber overlap or incomplete spreading caused by insufficient web-laying section width. This improves both web-laying efficiency and fiber web uniformity.

[0061] Furthermore, the width of the oscillating web section 31 is greater than or equal to the axial length of the guide roller 4, so that the filament bundle can be fully spread when it enters the oscillating web section 31, avoiding the problem of fiber overlap or incomplete spreading caused by insufficient width of the oscillating web section 31.

[0062] As another embodiment of this example, the guide roller 4 includes an upper guide roller 41 and a lower guide roller 42 that are parallel and spaced apart. The lower guide roller 42 overlaps with the infeed end 311 of the oscillating web laying section. The upper guide roller 41 is located above the oscillating web laying section 32. The filaments output from the filament outlet end of the coagulation bath 2 pass through the gap between the upper guide roller 41 and the lower guide roller 42 and enter the oscillating web laying section 2.

[0063] The gap design between the upper guide roller 41 and the lower guide roller 42 ensures that the filament bundle is subjected to appropriate tension control before entering the oscillating web-laying section 31, thereby maintaining a stable path and direction. This precise guidance allows the filament bundle to enter the web-laying process evenly and smoothly, avoiding uneven fiber distribution caused by uneven slack or tension.

[0064] Furthermore, the parallel arrangement of the upper guide roller 41 and the lower guide roller 42 forms a precisely controlled channel. When the filament bundle passes through this channel, its movement is effectively controlled, reducing friction and resistance during the transfer process. The overlap between the lower guide roller 42 and the filament feed end 311 of the oscillating web laying section ensures that the filament bundle can smoothly transition to the oscillating web laying section, reducing breakage or twisting problems caused by poor transition.

[0065] Furthermore, as one embodiment of this invention, there are two vertically arranged mounting frames between the coagulation bath 2 and the oscillating mesh laying section 31, namely the left mounting frame 43 and the right mounting frame 44. The left mounting frame 43 is located near the left end of the oscillating mesh laying section 31, and the right mounting frame 44 is located near the right end of the oscillating mesh laying section 31. The two ends of the upper guide roller 41 and the lower guide roller 42 are respectively arranged on the two mounting frames, and the distance between the upper guide roller 41 and the lower guide roller 42 is adjustable.

[0066] In this embodiment, two vertical mounting brackets provide a stable support structure for fixing the upper guide roller 41 and the lower guide roller 42. The mounting brackets are positioned close to the left and right ends of the swinging web laying section 31, ensuring the stability of the entire guiding structure and preventing swaying or displacement during the web laying process.

[0067] Furthermore, the coagulation bath 2 of the present invention has left and right side walls arranged opposite to each other, and the bottom wall 23 of the coagulation bath 23 has a liquid outlet extending from the left side wall to the right side wall. The axial extension direction of the guide roller 4 is the same as the extension direction of the liquid outlet. Preferably, the length of the liquid outlet is equal to the distance between the left side wall and the right side wall of the coagulation bath 2, and the width of the liquid outlet is smaller than the diameter of the guide roller 4, preferably 0.2cm-10cm, more preferably 0.3cm-0.6cm.

[0068] The design of the liquid outlet in this invention allows the coagulation bath liquid to flow out evenly through the narrow slit of the outlet, creating a stable liquid flow environment. After being extruded from the spinning assembly, the continuous filament enters the coagulation bath 2 through an air gap. Under the action of liquid flow, it maintains a moderately micro-tension state. This micro-tension state not only effectively prevents the filament from relaxing and shrinking in the width direction, but also ensures the dimensional stability of the filament in the width direction. Through the arrangement of this invention, the stability and uniformity of the filament are guaranteed throughout the forming process, thus laying the foundation for forming a nonwoven fabric with uniform width. In other words, the design of the liquid outlet is an important prerequisite for ensuring that the final product achieves ideal uniformity and dimensional stability in the width direction, guaranteeing the overall quality and performance stability of the nonwoven fabric.

[0069] The continuous cellulose fiber nonwoven fabric equipment of the present invention also includes a negative pressure suction device, which includes a negative pressure suction device housing 5 disposed below the conveying section 32. The top wall of the negative pressure suction device housing 5 is vertically opposite to the conveying section 32. A suction port 51 is provided on the top wall of the negative pressure suction device housing 5, which connects the inside and outside of the negative pressure suction device housing 5 and extends from one end of its top wall to the other end. The conveying section 32 has a vent hole. The suction port 51 forms a negative pressure on the lower side of the conveying section 32. When the filament bundle above the conveying section 32 passes above the suction port 51, the liquid on the filament bundle enters the negative pressure suction device housing 5 through the vent hole and the suction port 51.

[0070] Furthermore, the negative pressure suction device housing 5 is located at least below the wire inlet end of the conveying section 32, and the extension direction of the suction port 51 is perpendicular to the conveying direction of the conveying section 32.

[0071] During fiber formation, the coagulation bath comes into close contact with the fiber bundle, helping the fibers to solidify and set. However, excessive residual coagulation bath can affect the forming quality of the fiber web, leading to fiber adhesion, uneven arrangement, and even affecting the stability of subsequent processes. The negative pressure suction device, through its powerful suction action, quickly removes the residual coagulation bath as the fiber bundle passes through the conveying section 32, achieving efficient separation of the fibers from the coagulation bath.

[0072] The negative pressure suction device not only plays a role in liquid separation, but also helps the fiber web maintain a specific texture structure through its negative pressure during the fiber web conveying process. In this process, the fiber web gradually forms an "S" shaped texture as it passes through the oscillating web laying section 31. The negative pressure suction device applies continuous negative pressure to the fiber web through the suction port 51 below the conveying section 32, ensuring that the fibers stably maintain this texture during the conveying process.

[0073] Under the action of the negative pressure suction device, the excess coagulation bath liquid has been basically removed from the fiber web before it enters the subsequent processing technology (such as hydroentangling and needle punching), and it maintains good shape setting and structural stability with the help of negative pressure. The fiber web in this state has higher stability and consistency, and the arrangement between fibers is more regular, which facilitates subsequent web fixing processes such as hydroentangling and needle punching.

[0074] As one embodiment of this invention, the equipment for continuous cellulose fiber nonwoven fabric includes several sets of the spinneret assemblies 1, coagulation baths 2 and web laying machines 3 arranged in sequence. The filament outlet end of the conveying section 32 of the preceding web laying machine 3 overlaps with the filament inlet end of the conveying section 32 of the following web laying machine 3. The fiber curtain output from the conveying section 32 of the preceding web laying machine 3 enters the conveying section 32 of the following web laying machine 3 and is located below the filament bundle output from the oscillating web laying section 31 of the following web laying machine 3 to form a double-layer fiber curtain.

[0075] Specifically, such as Figure 2 As shown, the equipment for continuous cellulose fiber nonwoven fabric includes, in sequence, a spinneret 1, a coagulation bath 2, a guide roller 4, a oscillating web laying section 31, a conveying section 32, a negative pressure suction device housing 5, a second set of spinnerets, a second set of coagulation baths 24, a second set of guide rollers 45, a second set of oscillating web laying sections 33, a second set of conveying sections 34, and a second set of negative pressure suction device housing 52.

[0076] The cellulose solution is first extruded through spinneret 1 to form a continuous filament bundle. Spinneret 1 is the starting point of the entire process; the cellulose liquid filament bundle extruded through the spinneret orifice enters the next stage. The extruded filament bundle enters coagulation bath 2, where it coagulates under the action of the coagulating liquid, gradually transforming from a liquid state into solid fibers. During this process, the filament bundle maintains a uniform tension in the width direction, forming a preliminary fiber bundle. The fiber bundle exiting coagulation bath 2 is guided by guide roller 4 to maintain the direction and tension of the filament bundle. The guide roller ensures that the filament bundle can stably enter the next stage without deviation or tension fluctuation. The fiber bundle guided by guide roller 4... The fiber bundle enters the oscillating web laying section 31, where its reciprocating oscillation causes the fiber bundle to be evenly distributed on the conveying section 32, forming a preliminary fiber web structure. The fiber web is then transferred from the oscillating web laying section 31 to the conveying section 32 and begins to be conveyed to the next component. During the conveying process, the fiber web continues to maintain its "S" shaped texture, ready for further processing. The negative pressure suction device box 5 located below the conveying section 32 creates negative pressure through the suction port 51 at the top, efficiently removing the coagulation bath liquid remaining on the fiber web. This process ensures that the fiber web is dried and shaped, forming a more stable and uniform fiber web, laying the foundation for the next stage of processing.

[0077] The second set of spinnerets 12 extrudes the cellulose solution again, forming new fiber bundles. This stage is typically used to produce fibers with different properties, such as fibers with added functional materials, or fibers with different diameters or shapes than those in the first stage. The second set of fiber bundles enters the second set of coagulation baths 24, where they are reformed into solid fibers again by the action of the coagulation liquid. Similar to the first stage, the fiber bundles form uniform fiber bundles in the coagulation bath, preparing them for subsequent processing. The second set of fiber bundles is guided by the second set of guide rollers 45, which maintain their stable direction and tension, ensuring that the fiber bundles smoothly enter the second set of oscillating web-laying sections 33. The fiber bundles guided by the second set of guide rollers 45 are then placed in the second set of oscillating web-laying sections 33. Under the action of the web laying section 33, a second set of oscillating web laying section output fiber curtain 331 is formed. This fiber curtain is evenly laid on the second set of conveying sections 34 and is located above the fiber curtain formed in the first stage, and is combined with it to form a two-layer fiber structure. The combined fiber curtain is conveyed on the second set of conveying sections 34 to continue to maintain its composite structure and prepare for the final processing process. Similar to the first stage, the second set of negative pressure suction device box 52 below the second set of conveying sections 34 performs liquid separation and shaping of the composite fiber web through the suction port. The suction process in this stage ensures the drying and shaping of the composite fiber web, laying a solid foundation for the final nonwoven fabric product.

[0078] As one implementation method of this embodiment, such as Figure 3 As shown, in the equipment for continuous cellulose fiber nonwoven fabric, among the spinnerets 1, coagulation bath 2 and web laying machine 3 arranged in sequence, at least one web laying machine 3 has an ultra-short fiber adding device 6 above the conveying section 32, which is used to feed ultra-short fibers or add other fibrous, powdery or granular materials to the conveying section 32, and finally form a preform of nonwoven fabric on the conveying section 32 of the web laying machine 3.

[0079] Preferably, the equipment for continuous cellulose fiber nonwoven fabric includes two sets of spinnerets 1, coagulation baths 2 and web laying machines 3 arranged in sequence. A short fiber adding device 6 is provided above the conveying section 32 of the first web laying machine 3. The short fiber adding device 6 feeds short fibers onto the fiber curtain on the conveying section 32 of the first web laying machine 3 to form a double-layer fiber curtain. The double-layer fiber curtain enters the conveying section 32 of the second web laying machine 3. The filament bundles output from the second oscillating web laying section cover the double-layer fiber curtain to form a triple-layer fiber curtain.

[0080] Specifically, the equipment for continuous cellulose fiber nonwoven fabric includes, in sequence, a spinneret 1, a coagulation bath 2, a guide roller 4, a oscillating web-laying section 31, a conveying section 32, a negative pressure suction device housing 5, a short fiber adding device 6, a third set of negative pressure suction device housings 53, a second set of spinnerets 12, a second set of coagulation baths 24, a second set of guide rollers 45, a second set of oscillating web-laying sections 33, a second set of conveying sections 34, and a second set of negative pressure suction device housings 52.

[0081] The formation of a three-layer fiber curtain specifically includes the following three stages:

[0082] First stage: The cellulose solution is first extruded through the spinneret 1 to form a continuous filament bundle; the extruded filament bundle enters the coagulation bath 2 and solidifies under the action of the coagulation liquid, changing from a liquid state to a solid fiber; the solidified fiber bundle passes through the guide roller 4, which ensures that the fiber bundle maintains the correct tension and direction, avoiding deviation or twisting when entering the next stage; the fiber bundle enters the oscillating web laying section 31, which oscillates back and forth in the transverse direction to output the first fiber curtain 35, which is evenly laid on the conveying section 32 to form a preliminary fiber web structure; the preliminary fiber web is conveyed from the oscillating web laying section 31 to the conveying section 32 and continues to be conveyed to the next process. During the conveying process, the fiber web maintains its "S" shaped texture; the negative pressure suction device box 5 below the conveying section 32 forms negative pressure through the suction port at the top to quickly remove the residual coagulation bath liquid on the fiber web;

[0083] Second stage: On the preliminary fiber web formed in the first stage, the ultra-short fiber adding device 6 evenly sprays or lays the ultra-short fibers, i.e., the second fiber curtain 36, on the surface of the fiber web; after the ultra-short fibers are added, the fiber web enters the box 53 of the third set of negative pressure suction device, and the negative pressure formed is used to remove any excess liquid that may exist, ensuring that the ultra-short fibers are tightly bonded to the preliminary fiber web and preparing for the next stage of processing.

[0084] The third stage: The second set of spinnerets 12 extrudes the cellulose solution again to form new filament bundles; the second set of filament bundles enters the second set of coagulation bath 24, where they are solidified again to form structurally stable solid fibers; the second set of guide rollers 45 guides the solidified fiber bundles to ensure their direction and tension are stable, and they enter the second set of oscillating web laying section 33; the second set of fiber bundles forms a third fiber curtain 37 under the reciprocating oscillation of the second set of oscillating web laying section 33, which is evenly laid on the second set of conveying section 34, covering the ultra-short fiber layer to form a three-layer fiber web; the composite three-layer fiber web is conveyed on the second set of conveying section 34, maintaining its multi-layer structure and "S" shaped texture, in preparation for the final shaping process; the second set of negative pressure suction device box 52 below the second set of conveying section 34 uses negative pressure to remove any liquid that may remain on the multi-layer fiber web, ensuring the final shaping and drying of the fiber web, and preparing it for subsequent processing.

[0085] Example 2

[0086] This embodiment provides a method for preparing continuous cellulose fiber nonwoven fabric: the preparation is carried out using the equipment described in this invention, and the steps are as follows:

[0087] (1) A spinning solution with a cellulose concentration of 11.5% (mass fraction) is extruded through a spinneret 1 with a width of 600 mm and 30,000 holes, and the extrusion rate is 1410 g / min.

[0088] (2) After extrusion, it enters the coagulation bath 2 and coagulates in a NMMO coagulation bath solution with a mass fraction of 15%.

[0089] (3) It is then pulled out by guide roller 4, which rotates at 46.15 m / min, forming a 1.3 dtex filament;

[0090] (4) The guide roller 4 pulls the filament bundle to the swinging web laying section 31, and the swinging frequency of the swinging web laying section 31 is 80 times / min;

[0091] (5) The oscillating mesh section 31 then enters the conveying section 32 at a speed of 10 m / min. Following hydroentangling reinforcement, washing, drying, and winding, the final product is as follows: Figure 4 The surface density shown is 30 g / m³. 2 Nonwoven fabric.

[0092] Example 3

[0093] This embodiment provides a method for preparing continuous cellulose fiber nonwoven fabric: the preparation is carried out using the equipment described in this invention, and the steps are as follows:

[0094] (1) A spinning solution with a cellulose concentration of 11.5% (mass fraction) is extruded through a spinneret 1 with a width of 600 mm and 30,000 holes, and the extrusion rate is 940 g / min.

[0095] (2) After extrusion, it enters the coagulation bath 2 and coagulates in a NMMO coagulation bath solution with a mass fraction of 15%.

[0096] (3) It is then pulled out by guide roller 4, which rotates at 46.15 m / min, forming a 1.3 dtex filament;

[0097] (4) The guide roller 4 pulls the filament bundle to the swinging web laying section 31, and the swinging frequency of the swinging web laying section 31 is 90 times / min;

[0098] (5) The oscillating netting section 31 then enters the conveying section 32, where the speed of the conveying section 32 is 10 m / min;

[0099] (6) A spinning solution with a total concentration of cellulose and titanium dioxide of 12.5% ​​is extruded through a second set of spinnerets 12 with a width of 600 mm and 30,000 holes, and the extrusion rate is 865 g / min; wherein the spinning solution contains titanium dioxide with a mass fraction of 0.5% of cellulose.

[0100] (7) After extrusion, it enters the second coagulation bath 24 and coagulates in the NMMO coagulation bath with a mass fraction of 15%.

[0101] (8) Then it is pulled out by the second set of guide rollers 45. The second set of guide rollers 45 rotates at 46.15 m / min, forming a 1.3 dtex filament;

[0102] (9) The second set of guide rollers 45 pulls the filament bundle to the second set of swinging web laying section 33, and the swinging frequency of the second set of swinging web laying section 33 is 67 times / min;

[0103] (10) After the fiber curtain on the conveying section 32 enters the second conveying section 34, the fiber curtain output from the second oscillating web laying section 33 also enters the second conveying section 34 and covers the top layer. The speed of the second conveying section 34 is 10m / min, forming a double-layer fiber curtain. Subsequently, it undergoes hydroentangling reinforcement, washing, drying, and winding to finally produce the product shown in the image. Figure 5 The surface density shown is 40 g / m³. 2 Matte nonwoven fabric.

[0104] Example 4

[0105] This embodiment provides a method for preparing continuous cellulose fiber nonwoven fabric: the preparation is carried out using the equipment described in this invention, and the steps are as follows:

[0106] (1) A spinning solution with a cellulose concentration of 13% (mass fraction) was extruded through a spinneret with a width of 1800 mm and 60,000 holes, with an extrusion rate of 3118.5 g / min.

[0107] (2) After extrusion, it enters the coagulation bath with a mass fraction of 15% NMMO coagulation solution for coagulation.

[0108] (3) It is then pulled out by the guide roller. The guide roller 4 rotates at a speed of 44.9 m / min, forming a 1.67 dtex filament.

[0109] (4) The guide roller 4 pulls the filament bundle to the swinging web laying section 31, and the swinging frequency of the swinging web laying section 31 is 100 times / min;

[0110] (5) The mesh is then moved from the oscillating mesh laying section 31 to the conveying section 32. The speed of the conveying section 32 is 10 m / min, which can produce a surface density of 25 g / m³. 2 Nonwoven fabrics;

[0111] (6) After melting polypropylene, it is passed through the meltblown die of an ultra-short fiber additive device with a width of 1800 mm. The extrusion rate is 270 g / min, and the conveying speed of section 32 is 10 m / min, resulting in a surface density of 15 g / m³. 2Meltblown fabric;

[0112] (7) A spinning solution with a cellulose concentration of 10% is extruded through a spinneret with 60,000 holes and a width of 1800 mm, at a rate of 3243.2 g / min. After extrusion, the solution is coagulated in a coagulation bath with a mass fraction of 15% NMMO. The solution is then drawn out by a guide roller 4 at a rotation speed of 60 m / min, forming 1.0 dtex filaments. The guide roller 4 guides the filament bundle to an oscillating web-laying section at an oscillation frequency of 100 times / min. The bundle then enters a conveying section at a speed of 10 m / min, yielding a surface density of 20 g / m³. 2 Nonwoven fabrics;

[0113] (8) The surface density is 25 g / m 2 Nonwoven fabric with a surface density of 15 g / m 2 Meltblown fabric with a surface density of 20 g / m 2 Nonwoven fabrics are combined to form a surface density of 60 g / m². 2 Nonwoven fabric.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for producing continuous cellulose fiber nonwoven fabric, characterized in that: it comprises at least a set of spinneret assembly, coagulation bath tank and laying machine arranged in sequence; the laying machine comprises a swinging laying section arranged at the fiber output end of the coagulation bath tank and a conveying section arranged at the fiber output end of the swinging laying section; a guide roller is arranged between the fiber output end of the coagulation bath tank and the swinging laying section, the swinging laying section reciprocally swings along the guide roller in the axial direction, and the fiber bundle output from the fiber output end of the coagulation bath tank is pulled to the swinging laying section through the guide roller and then output by the conveying section. The fiber input end of the swinging laying section is arranged close to the fiber output end of the coagulation bath tank, the fiber output end of the swinging laying section is overlapped with the conveying section, the swinging laying section is arranged from the fiber input end to the fiber output end in a downward slope, and the guide roller is arranged above the fiber input end of the swinging laying section. The width of the swinging laying section gradually narrows from the fiber input end to the fiber output end. Preferably, the width of the swinging laying section is greater than or equal to the axial length of the guide roller.

2. An apparatus for continuously producing a nonwoven fabric of cellulose fibers according to claim 1, wherein:

4. The device for producing continuous cellulose fiber nonwoven fabric according to claim 2 or 3, characterized in that: the guide roller comprises upper and lower guide rollers arranged in parallel and at intervals, the lower guide roller is overlapped with the fiber input end of the swinging laying section, and the upper guide roller is arranged above the swinging laying section, the fiber bundle output from the fiber output end of the coagulation bath tank passes through the gap between the upper and lower guide rollers and enters the swinging laying section.

3. An apparatus for continuously producing a nonwoven cellulose fiber fabric according to claim 2, wherein:

5. The device for producing continuous cellulose fiber nonwoven fabric according to claim 4, characterized in that: two mounting racks are arranged vertically between the coagulation bath tank and the swinging laying section, the two mounting racks are arranged close to the left and right ends of the swinging laying section respectively, the two ends of the upper and lower guide rollers are arranged on the two mounting racks respectively, and the distance between the upper and lower guide rollers is adjustable. The coagulation bath tank has oppositely arranged left and right side walls, and the bottom wall of the coagulation bath tank is provided with a liquid outlet extending from the left side wall to the right side wall, and the axial extension direction of the guide roller is the same as the extension direction of the liquid outlet.

7. The device for producing continuous cellulose fiber nonwoven fabric according to any one of claims 1-6, characterized in that: it further comprises a negative pressure suction device, the negative pressure suction device comprises a box arranged below the conveying section, the top wall of the box is opposite to the conveying section, the top wall of the box is provided with a suction port extending from one end to the other end of the top wall and communicating inside and outside the box, the conveying section is provided with air permeable holes, and the suction port forms a negative pressure below the conveying section, when the fiber bundle above the conveying section passes above the suction port, the liquid on the fiber bundle enters the box through the air permeable holes and the suction port. Preferably, the box is arranged at least below the fiber input end of the conveying section, and the extension direction of the suction port is perpendicular to the conveying direction of the conveying section.

8. The device for producing continuous cellulose fiber nonwoven fabric according to any one of claims 1-7, characterized in that: ​ 6. An apparatus for continuously producing a nonwoven cellulose fiber fabric according to any one of claims 1 to 5, characterized in that: ​ ​ ​ ​ ​ The device comprises several groups of the sequentially arranged spinning assembly, coagulation bath and laying machine, the delivery end of the conveying section of the preceding laying machine overlaps with the feeding end of the conveying section of the following laying machine, the fiber curtain output by the conveying section of the preceding laying machine enters the conveying section of the following laying machine and is located below the fiber bundle output by the oscillating laying section of the following laying machine to form a double-layer fiber curtain.

9. An apparatus for continuously producing a nonwoven cellulose fiber fabric according to claim 8, characterized in that: In the several groups of the sequentially arranged spinning assembly, coagulation bath and laying machine, the upper part of the conveying section of at least one group of laying machine is provided with a super short fiber adding device for adding super short fibers to the conveying section; Preferably, the device comprises two groups of the sequentially arranged spinning assembly, coagulation bath and laying machine, the upper part of the conveying section of the preceding laying machine is provided with a super short fiber adding device, the super short fiber adding device adds super short fibers to the fiber curtain on the conveying section of the preceding laying machine to form a double-layer fiber curtain, the double-layer fiber curtain enters the conveying section of the following laying machine, the fiber bundle output by the oscillating laying section of the following laying machine covers the double-layer fiber curtain to form a three-layer fiber curtain.

10. A method for producing a continuous cellulosic fiber nonwoven fabric, characterized by, The device is used for preparing, and the preparation steps comprise: (1) controlling the spinning of the spinning assembly, and the fiber bundle enters the coagulation bath for coagulation; (2) the fiber bundle is pulled to the oscillating laying section by the guide roller after being output from the coagulation bath, the oscillating laying section is controlled to reciprocate along the guide roller axially left and right, a fiber curtain with "S" texture is formed, and the fiber curtain is output by the conveying section.

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