A glue making system suitable for lyocell fiber production

Abstract

The utility model discloses a system of making glue suitable for lyocell fiber production belongs to cellulose fiber production technical field. System of making glue includes rubbing crusher, beating machine, premixing jar and film reactor, and rubbing crusher is connected with beating machine through conveying mechanism, and beating machine is connected with NMMO solvent feed pipe and inhibitor feed pipe, and beating machine is connected with premixing jar through delivery pipe II. Premixing jar is connected with film reactor through delivery pipe III. The back side of the station of film reactor is equipped with temporary glue storage tank. Rubbing crusher, conveying mechanism, beating machine, delivery pipe II, premixing jar, delivery pipe III, film reactor and temporary glue storage tank form the continuous passageway of pulp and pulp continuous glue making between them. Through the specific arrangement of each equipment, better cooperation in lyocell fiber production process, on the one hand, prevent dust hazards, on the other hand, guarantee the quality of glue making, and then guarantee the quality of lyocell fiber finished product.

Description

Technical Field

[0001] This utility model relates to a glue-making system, and more particularly to a glue-making system suitable for the production of lyocell fibers, belonging to the field of cellulose fiber production technology. Background Technology

[0002] Lyocell fiber is a new type of green cellulose fiber that uses NMMO as a solvent to achieve dissolution and regeneration through physical dissolution methods, making the entire production process green and environmentally friendly. Lyocell fiber has the comfort of cotton, the strength of polyester, the drape of viscose fiber, and the feel of silk. Due to its excellent performance in clothing and textile processing, it has achieved multi-level applications in both civilian and industrial fields. Therefore, the market demand for lyocell fiber has been continuously increasing in recent years.

[0003] In lyocell fiber production, the preparation of spinning solutions generally involves two processes: wet sizing and dry sizing.

[0004] The dry process involves first dry-crushing the pulp, then directly adding a 75-80% NMMO solution for premixing, and finally dissolving it in a reaction vessel to prepare the spinning solution.

[0005] II. The wet process involves first mixing pulp raw materials with water to a certain concentration, then wet pulping followed by pressing and pulverizing to obtain materials with a certain degree of dryness. Then, an NMMO solution with a concentration of 80-84% is added for premixing, and finally the mixture is placed in a reaction vessel for evaporation and dehydration to prepare spinning dope.

[0006] Although dry pulping omits the cellulose pulp preparation process, reduces the NMMO solution concentration, and decreases steam consumption compared to wet pulping, it adds the grinding process of dry pulp. Pulp grinding easily generates dust, polluting the environment and posing significant fire and explosion hazards. Furthermore, the continuous weighing process of cellulose pulp can lead to inaccurate weighing, causing unstable proportions of cellulose, NMMO, and water in the mixed pulp, thus affecting the continuous and stable operation of production.

[0007] Currently, pulp is typically premixed directly with a 75-80% NMMO solution before being dissolved in a reactor to prepare the spinning solution. Compared to dry processes, this reduces the pulp grinding process and avoids safety hazards. However, because the pulp is directly mixed with a high-concentration NMMO solution for swelling (swelling refers to the physical phenomenon of polymers expanding in volume after absorbing liquid; in lyocell production, it usually refers to the state where NMMO solution penetrates between or inside the pulp fibrillary molecules), the high mixing temperature easily leads to initial dissolution. This initial dissolution results in insufficient swelling of the pulp raw material, leading to incompletely dissolved "white cores" during dissolution. This deteriorates the quality of the gel and severely affects the quality of the finished product.

[0008] Existing technologies CN118497906A and CN219731138U form a grinding / kneading system by setting up a circulation pipe, a circulation pump and a grinding machine. They use mechanical force to deagglomerate and disperse the pulp clumps and fully mix the fibers with NMMO solvent to avoid pulp clumps and white cores, but they do not solve the dust hazard.

[0009] Therefore, a glue-making system is needed that can avoid dust hazards from crushed materials, ensure sufficient swelling, prevent the formation of "white cores," guarantee the quality of the glue, and be used to produce lyocell fibers. Summary of the Invention

[0010] To address the problems in existing lyocell fiber production, such as dust hazards from pulverized materials, insufficient swelling leading to "white cores," and poor glue quality, a glue-making system suitable for lyocell fiber production is proposed. In this technical solution, the specific arrangement of each piece of equipment prevents dust hazards and ensures glue quality, thereby guaranteeing the quality of the subsequent lyocell fiber product. For example, the premixing tank is located behind the pulping machine, which is located behind the pulverizer. This means that pulverization precedes mixing before swelling, solving the problem of large unswelled pulp slabs during pulping. This arrangement facilitates fiber swelling, avoids affecting glue quality, and effectively prevents the formation of incompletely dissolved "white core" particles. Furthermore, it can be well integrated with the lyocell fiber production process, ensuring the sustainability and controllability of the glue-making process.

[0011] To achieve the above technical objectives, the following technical solution is proposed:

[0012] The purpose of this technical solution is to provide: a glue-making system suitable for the production of lyocell fibers, including a pulverizer, a pulper, a premixing tank, and a thin-film reactor, wherein,

[0013] Crusher: Located in front of the pulping machine station, the discharge port of the crusher is connected to the feed port of the pulping machine through a conveying mechanism;

[0014] Pulping machine: It is connected to the NMMO solvent feed pipe and the inhibitor feed pipe. The pulping machine is located in front of the premixing tank. The discharge port of the pulping machine is connected to the feed port of the premixing tank through the conveying pipe II. The conveying pipe II is equipped with a conveying pump I and a pressure sensor I. The conveying pump I and the pressure sensor I are interlocked by an electrical signal.

[0015] Premixing tank: Located in front of the working position of the thin film reactor, the discharge port of the premixing tank is connected to the feed port of the thin film reactor through the conveying pipe III; the conveying pipe III is equipped with a conveying pump II and a pressure sensor II, and the conveying pump II and the pressure sensor II are interlocked by an electrical signal.

[0016] Thin film reactor: The thin film reactor is equipped with temperature sensor II and vacuum detector. A gelation temporary storage tank is located at the rear of the working station of the thin film reactor. The discharge port of the thin film reactor is connected to the gelation temporary storage tank.

[0017] A continuous pathway for continuous pulp rubber production is formed between the crusher, conveying mechanism, pulper, conveying pipe II, premixing tank, conveying pipe III, thin film reactor, and rubber temporary storage tank.

[0018] Furthermore, a conveying mechanism is provided at the front of the crusher's workstation. This conveying mechanism is used to feed the raw material slurry into the crusher, ensuring the continuity and controllability of the rubber-making process. More specifically, the conveying mechanism includes a conveyor belt, and the outlet of the conveyor belt is located on the workstation side of the crusher's feed inlet.

[0019] Furthermore, the conveying mechanism includes a semi-enclosed quantitative feeder and a conveying pipe I. One end of the semi-enclosed quantitative feeder is connected to the discharge port of the crusher, and the other end is connected to the conveying pipe I. The conveying pipe I is connected to the feed port of the pulper. The conveying mechanism is used to convey and weigh the crushed material.

[0020] Furthermore, the feed inlet of the pulper is located at the top of the pulper, the circulation port is located at the bottom of the pulper, and the discharge port is located at the bottom of the pulper; the circulation port is connected to a circulation pipe, which is connected to the discharge section on the conveying pipe I. The pulverized dry material is carried to the pulper by the circulating liquid, thus avoiding the harm of dust.

[0021] Furthermore, the premixing tank includes a tank body, a stirring mechanism disposed inside the tank body, and a jacket disposed outside the tank body. The tank body is equipped with a temperature sensor I and a liquid level sensor. The liquid level sensor is interlocked with the delivery pump I via an electrical signal, and the liquid level sensor is interlocked with the delivery pump II via an electrical signal.

[0022] In this technical solution, the positional relationships involved, such as "front side of the workstation", "upper", "inner", "outer side", "rear side of the workstation", and "between", are defined according to the actual usage conditions and are conventional terms in this technical field, as well as conventional terms used by those skilled in the art in actual use.

[0023] The beneficial technical effects of adopting this technical solution are as follows:

[0024] I. In this utility model, through the specific arrangement of each piece of equipment, the glue-making system is designed to work well with the lyocell fiber production process. This prevents dust hazards and ensures the quality of the glue, thereby guaranteeing the quality of the final lyocell fiber product. For example, the premixing tank is located behind the pulping machine, which is located behind the pulverizer. This means that before swelling, the fibers are pulverized and then mixed, solving the problem of large unswelled pulp slabs forming during the pulping process. This arrangement facilitates fiber swelling, avoids affecting the quality of the glue, and effectively prevents the formation of incompletely dissolved "white core" particles.

[0025] Second, in this utility model, by setting up a circulation pipe, liquid circulation is used during pulping, which solves the problem of dust hazards generated by the crushed material.

[0026] Thirdly, in this invention, temperature sensors I and II are used to monitor the temperatures in the premixing tank and the thin-film reactor, respectively, allowing the slurry to swell and dissolve within a certain temperature range, thus improving the uniformity of the gel formation. Pressure sensors I and II are used to monitor the pressure in delivery pipes II and III, respectively, facilitating effective control of the material delivery speed by the delivery pump. A level sensor is used to detect the liquid level in the premixing tank, thereby regulating the feeding and discharging in delivery pipes II and III. A vacuum detector is used to monitor the vacuum level in the thin-film reactor. This ensures the sustainability and controllability of the gel formation process.

[0027] IV. This utility model ensures that the production process of lyocell fiber is short, the equipment layout occupies a small area, the solvent concentration is low, the production efficiency is high, the energy consumption is low, and the production cost is low. Attached Figure Description

[0028] Figure 1 This is a structural block diagram of the present invention;

[0029] Figure 2 This is a schematic diagram illustrating the working principle of this utility model;

[0030] Figure 3 This is a schematic diagram of the pulping machine in this utility model;

[0031] Figure 4 This is a schematic diagram of the premixing tank in this utility model;

[0032] In the diagram, 1. Crusher, 2. Pulping machine, 21. Circulation port, 22. Upper feed port of the pulping machine, 23. Upper discharge port of the pulping machine, 3. Premixing tank, 31. Tank body, 32. Stirring mechanism, 33. Jacket, 34. Temperature sensor I, 35. Liquid level sensor, 4. Thin film reactor, 41. Temperature sensor II, 42. Vacuum detector, 6. NMMO solvent feed pipe, 7. Inhibitor feed pipe, 8. Conveying pipe II, 9. Conveying pump I, 10. Pressure sensor I, 11. Conveying pipe III, 12. Conveying pump II, 13. Pressure sensor II, 14. Gelation temporary storage tank, 15. Conveying belt, 16. Semi-enclosed quantitative feeder, 17. Conveying pipe I, 18. Circulation pipe. Detailed Implementation

[0033] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0034] Example 1

[0035] This embodiment provides: a glue-making system suitable for the production of lyocell fibers, such as... Figure 1-2 As shown, the system includes a crusher 1, a pulper 2, a premix tank 3, and a thin-film reactor 4. The crusher 1 is located in front of the pulper 2. The discharge port of the crusher 1 is connected to the feed port 22 of the pulper through a conveying mechanism. The conveying mechanism includes a semi-enclosed quantitative feeder 16 and a conveying pipe I 17. One end of the semi-enclosed quantitative feeder 16 is connected to the discharge port of the crusher 1, and the other end is connected to the conveying pipe I 17. The conveying pipe I 17 is connected to the feed port 22 of the pulper.

[0036] like Figure 3 As shown, the pulper 2 is provided with a circulation port 21 at the bottom, and the circulation port 21 is connected to a circulation pipe 18. The circulation pipe 18 is connected to the discharge section on the conveying pipe I 17. The pulper 2 is connected to an NMMO solvent feed pipe 6 and an inhibitor feed pipe 7. The pulper 2 is located in front of the work station of the premixing tank 3. The discharge port 23 of the pulper is connected to the feed port of the premixing tank 3 through the conveying pipe II 8.

[0037] The premixing tank 3 is located in front of the station of the thin film reactor 4, and the discharge port of the premixing tank 3 is connected to the feed port of the thin film reactor 4 through the conveying pipe Ⅲ11.

[0038] A gelation storage tank 14 is provided at the rear of the work station of the thin film reactor 4, and the discharge port of the thin film reactor 4 is connected to the gelation storage tank 14.

[0039] A continuous pathway for continuous pulp rubber production is formed between the pulverizer 1, the semi-enclosed quantitative feeder 16, the conveying pipe I 17, the pulper 2, the conveying pipe II 8, the premixing tank 3, the conveying pipe III 11, the thin film reactor 4, and the rubber temporary storage tank 14.

[0040] The system includes a crusher 1, a semi-enclosed quantitative feeder 16, a conveying pipe I 17, a pulper 2, a conveying pipe II 8, a premixing tank 3, a conveying pipe III 11, a thin film reactor 4, and a glue-forming temporary storage tank 14. These components can be well integrated with the lyocell fiber production process to ensure the sustainability of the glue-making process.

[0041] By placing the premix tank 3 behind the station of the pulper 2, and placing the pulper 2 behind the station of the crusher 1, that is, crushing before mixing before swelling, the problem of large unswelled pulp board parts being generated during the pulping process is solved. This setting is conducive to fiber swelling, avoids affecting the quality of glue formation, and effectively prevents the formation of incompletely dissolved "white core" particles.

[0042] By adopting a semi-enclosed quantitative feeder 16, material loss is prevented, ensuring the accurate proportion of each material in the mixed pulp and improving the product quality of Lyocell fiber; on the other hand, dust hazards from the material are avoided.

[0043] By using the circulation pipe 18, the pulverized dry material is carried to the pulper 2 by the circulating liquid, thus avoiding the dust hazards in dry pulping.

[0044] Example 2

[0045] Based on Example 1, this example further specifies the following to facilitate the feeding and transportation of raw pulp:

[0046] A conveying mechanism is provided at the front of the workstation of the crusher 1. This conveying mechanism is used to feed the raw material pulp into the crusher 1 to ensure the continuity and controllability of the rubber making process. More specifically, the conveying mechanism includes a conveyor belt 15, and the discharge port of the conveyor belt 15 is located on the workstation side of the feed inlet of the crusher 1.

[0047] The conveying mechanism is used for conveying and weighing the crushed material. In one embodiment, the semi-enclosed quantitative feeder 16 includes a conveyor belt, a semi-enclosed cover fitted above the conveyor belt, and a weighing device located below the conveyor belt. This semi-enclosed quantitative feeder 16 achieves material conveying and weighing while avoiding dust hazards and preventing material loss.

[0048] Example 3

[0049] Based on Examples 1-2, this example further defines the pulping machine 2 to provide a further explanation of the technical solution.

[0050] The feed inlet 22 of the pulper is located at the top of the pulper 2, and the discharge outlet 23 of the pulper is located at the bottom of the pulper 2. The fixed positions of the feed inlet 22 and the discharge outlet 23 of the pulper ensure the orderly feeding and discharging, and provide the prerequisite for the smooth and effective carrying of the pulverized dry material by the circulating liquid.

[0051] Example 4

[0052] Based on Examples 1-3, this example further defines the premixing tank 3 to provide a further explanation of the technical solution.

[0053] The premixing tank 3 includes a tank body 31, a stirring mechanism 32 disposed inside the tank body 31, and a jacket 33 disposed outside the tank body 31 (e.g., Figure 4 As shown), a temperature sensor I 34 and a liquid level sensor 35 are installed on the tank body 31. The temperature sensor I 34 is set to monitor the temperature inside the premixing tank 3, so that the slurry swells within a certain temperature range, improving the uniformity of gelation; the liquid level sensor 35 is set to detect the liquid level in the premixing tank, thereby regulating the feeding and discharging in the conveying pipe II 8 and conveying pipe III 11.

[0054] Example 5

[0055] Based on Examples 1-4, this example further defines the thin-film reactor 4 to provide a further explanation of the technical solution.

[0056] The thin-film reactor 4 is equipped with a temperature sensor II 41 and a vacuum detector 42. The temperature sensor II 41 is set to monitor the temperature inside the thin-film reactor 4, so that the slurry dissolves within a certain temperature range and improves the uniformity of gel formation; the vacuum detector 42 is set to monitor the vacuum level inside the thin-film reactor 4, thereby ensuring the sustainability and controllability of the gel formation process.

[0057] Example 6

[0058] Based on Examples 1-5, this example further specifies the following to improve the continuity and controllability of material conveying:

[0059] The conveying pipe II8 is equipped with a conveying pump I9 and a pressure sensor I10, which are interlocked by an electrical signal. The pressure sensor I10 detects the pressure inside the conveying pipe II8 and then transmits the pressure signal to the control center. The control center adjusts the opening of the conveying pump I9, thereby controlling the material conveying speed inside the conveying pipe II8.

[0060] The conveying pipe Ⅲ11 is equipped with a conveying pump Ⅱ12 and a pressure sensor Ⅱ13, which are interlocked by an electrical signal. The pressure sensor Ⅱ13 detects the pressure inside the conveying pipe Ⅲ11 and then transmits the pressure signal to the control center. The control center adjusts the opening of the conveying pump Ⅱ12, thereby controlling the material conveying speed inside the conveying pipe Ⅲ11.

[0061] The level sensor 35 is interlocked with the transfer pump I9 via an electrical signal, and the level sensor 35 is also interlocked with the transfer pump II12 via an electrical signal. Specifically, the level sensor 35 detects the liquid level inside the tank 31 and then transmits the liquid level signal to the control center, thereby controlling the liquid level in the tank 31 and the material conveying rate within the pipeline.

[0062] As one implementation method, screw pumps can be specifically selected for each delivery pump.

[0063] Example 7

[0064] Based on Examples 1-6, this example provides a gluing process suitable for the production of lyocell fibers, specifically including:

[0065] S1: Pulp crushing and weighing

[0066] The raw pulp is fed into the crusher, and the particle size of the crushed material is controlled to be ≤10mm; then, it is conveyed to the pulping machine through the conveying mechanism.

[0067] S2: Pulping

[0068] Based on the amount of pulp conveyed, calculate and add the required amounts of NMMO solvent, inhibitors (gallic acid, hydroxylamine, etc.) and water. A liquid circulation pulper is used (the circulation pipe is connected to the conveying pipe II) to avoid excessive dust pollution. The pulper cover is closed to prevent material splashing during mixing and to avoid contact between the material and air, which could cause fluctuations in the material's moisture content.

[0069] S3: Swelling

[0070] The pulp formed by the pulping machine is transported to the premixing tank by pump I; at a certain temperature, the pulp is kept in the premixing tank for a period of time to ensure that the solvent can penetrate into the cellulose evenly and fully;

[0071] The temperature inside the jacket of the premixing tank is 70°C, and stirring is maintained inside the tank.

[0072] S3: Dissolve

[0073] The slurry, after swelling in the premixing tank, is transported to the thin-film reactor by pump II; under high temperature and vacuum, the slurry dissolves to form a gel.

Claims

1. A glue-making system suitable for the production of lyocell fibers, characterized in that: It includes a crusher (1), a pulper (2), a premixing tank (3), and a thin-film reactor (4), wherein, The crusher (1) is located in front of the pulper (2). The discharge port of the crusher (1) is connected to the feed port (22) of the pulper through a conveying mechanism. The conveying mechanism includes a semi-enclosed quantitative feeder (16) and a conveying pipe I (17). One end of the semi-enclosed quantitative feeder (16) is connected to the discharge port of the crusher (1), and the other end is connected to the conveying pipe I (17). The conveying pipe I (17) is connected to the feed port (22) of the pulper. The pulper (2) is provided with a circulation port (21) at the bottom, and the circulation port (21) is connected to a circulation pipe (18). The circulation pipe (18) is connected to the discharge section on the conveying pipe I (17). The pulper (2) is connected to an NMMO solvent feed pipe (6) and an inhibitor feed pipe (7). The pulper (2) is located in front of the work station of the premixing tank (3). The discharge port (23) of the pulper is connected to the feed port of the premixing tank (3) through the conveying pipe II (8). The premixing tank (3) is located in front of the work station of the thin film reactor (4), and the discharge port of the premixing tank (3) is connected to the feed port of the thin film reactor (4) through the conveying pipe III (11); A gelation storage tank (14) is provided on the rear side of the work station of the thin film reactor (4), and the discharge port of the thin film reactor (4) is connected to the gelation storage tank (14). A continuous pathway for continuous pulp production is formed between the pulverizer (1), the semi-enclosed quantitative feeder (16), the conveying pipe I (17), the pulper (2), the conveying pipe II (8), the premixing tank (3), the conveying pipe III (11), the thin film reactor (4), and the rubber storage tank (14).

2. The adhesive-making system for lyocell fiber production according to claim 1, characterized in that: The crusher (1) is equipped with a conveying mechanism on the front side of the workstation.

3. The adhesive-making system for lyocell fiber production according to claim 2, characterized in that: The conveying mechanism includes a conveyor belt (15), and the outlet of the conveyor belt (15) is located on one side of the feed inlet of the crusher (1).

4. The adhesive-making system for lyocell fiber production according to claim 1, characterized in that: The feed inlet (22) of the pulper is located at the top of the pulper (2), and the discharge outlet (23) of the pulper is located at the bottom of the pulper (2).

5. The adhesive-making system for lyocell fiber production according to claim 1, characterized in that: The thin-film reactor (4) is equipped with a temperature sensor II (41) and a vacuum detector (42).

6. The adhesive-making system for lyocell fiber production according to any one of claims 1-5, characterized in that: The premixing tank (3) includes a tank body (31), a stirring mechanism (32) inside the tank body (31), and a jacket (33) outside the tank body (31). A temperature sensor I (34) and a liquid level sensor (35) are provided on the tank body (31).

7. The adhesive-forming system for lyocell fiber production according to claim 6, characterized in that: The delivery pipe II (8) is equipped with a delivery pump I (9) and a pressure sensor I (10), and the pressure sensor I (10) and the delivery pump I (9) are interlocked by an electrical signal.

8. The adhesive-forming system for lyocell fiber production according to claim 7, characterized in that: The delivery pipe Ⅲ (11) is equipped with a delivery pump Ⅱ (12) and a pressure sensor Ⅱ (13), and the pressure sensor Ⅱ (13) and the delivery pump Ⅱ (12) are interlocked by an electrical signal.

9. The adhesive-making system for lyocell fiber production according to claim 8, characterized in that: The liquid level sensor (35) is interlocked with the transfer pump I (9) by an electrical signal, and the liquid level sensor (35) is interlocked with the transfer pump II (12) by an electrical signal.

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