Multi-channel continuous degumming device and method for removing sizing agent on fiber surface

Abstract

The invention provides a multi-channel continuous degumming device and method for removing sizing agents on the surfaces of fibers, and is applied to the technical field of fiber composite manufacturing. The device comprises a cleaning tank, a rinsing tank and a multi-channel tubular furnace which are sequentially arranged; a plurality of rotatable smooth bars are arranged at the wire inlet ends and the wire outlet ends of a cleaning tank and a rinsing tank, and meanwhile multiple bundles of fibers are guided to enter a multi-channel tubular furnace; wherein in the cleaning tank, a cleaning agent is used for removing a sizing agent on the surfaces of multiple bundles of fibers in a soaking manner; the washing tank is used for washing multiple bundles of fibers with clean water to clean the residual cleaning agent; the multi-channel tubular furnace is used for simultaneously carrying out heat treatment on multiple bundles of fibers at low temperature to synergistically remove the sizing agent and the organic cleaning agent remained on the surfaces of the fibers. Therefore, the method is a major breakthrough in the fields of carbon fiber surface modification and carbon fiber composites, the sizing agent on the surface of the carbon fiber can be efficiently and continuously removed, meanwhile, the original state of the carbon fiber cannot be damaged, and the method can be widely applied to industrial large-scale production.

Description

Technical Field

[0001] This application relates to the field of fiber composite material manufacturing technology, and in particular to a multi-channel continuous degumming device and method for removing sizing agents from fiber surfaces. Background Technology

[0002] Carbon fiber was invented in the late 1950s. Due to its unique and excellent properties, such as high specific strength, high specific modulus, low density, high temperature resistance, radiation resistance, good toughness, good electrical and thermal conductivity, and low coefficient of thermal expansion, it has been widely used in the field of composite materials. To protect the fibers and improve their performance in subsequent processing, the surface of the fibers is usually coated with a sizing agent when they leave the factory.

[0003] However, when preparing composite fiber materials, the sizing agent applied at the factory often becomes an obstacle to the bonding between the fiber and the resin or metal matrix, resulting in insufficient interfacial bonding strength and becoming a shortcoming in the overall performance of the composite material.

[0004] Therefore, before preparing composite fiber material components, it is necessary to completely remove the original sizing agent from the fiber surface. Existing methods for removing sizing agents from fiber surfaces mainly include heat treatment, chemical solvent methods, and plasma methods, but each method has its own drawbacks. For example, heat treatment requires pyrolysis of the sizing agent at high temperatures of 400-700℃. This high-temperature process easily damages the fiber structure (especially the carbon fiber surface), leading to decreased fiber strength, numerous fiber breaks, and affecting the performance and quality of the subsequent composite material. Furthermore, it is extremely energy-intensive. Chemical solvent immersion methods typically use organic solvents such as acetone, requiring the carbon fibers to be immersed in the solvent for 1-24 hours, combined with ultrasonic cleaning. This method is inefficient, difficult to scale up for continuous production, and only suitable for small-scale laboratory use. It also cannot guarantee the amount of sizing agent removed or the amount of residual chemical solvent, introducing new solvent residues and causing secondary pollution, affecting the quality of the subsequent composite interface. Plasma treatment, oxidation, and mechanical removal methods have very high requirements for the process environment, are cumbersome, and extremely costly, making them unsuitable for large-scale industrial application and production.

[0005] Therefore, there is an urgent need in the field for an apparatus and method that can efficiently, continuously, and non-destructively remove sizing agents from fiber surfaces and is suitable for large-scale industrial production. Summary of the Invention

[0006] (a) Purpose of the invention The primary objective of this application is to overcome the deficiencies of the prior art and provide an apparatus and method for continuously, efficiently, and non-destructively removing sizing agents from fiber surfaces.

[0007] Another objective of this application is to provide a degumming solution that can simultaneously process multiple fiber bundles, significantly improving production efficiency.

[0008] Another objective of this application is to ensure that the surface of the fiber is clean and highly active after degumming through optimized process flow and equipment design, thereby significantly improving its interfacial bonding strength with the resin or metal matrix.

[0009] (II) Technical Solution This application provides a multi-channel continuous degumming device for removing sizing agents from fiber surfaces, comprising a cleaning tank, a washing tank, and a multi-channel tubular furnace arranged sequentially. The cleaning tank and the washing tank each have several rotatable smooth rods at their inlet and outlet ends. These smooth rods simultaneously guide multiple fiber bundles and reduce fiber surface damage. The cleaning tank has a U-shaped structure inside to contain an organic cleaning agent, immersing the multiple fiber bundles between the inlet and outlet ends in the organic cleaning agent to clean the sizing agent from the fiber surface using the organic solvent. The washing tank is used to wash the multiple fiber bundles treated in the cleaning tank to remove residual organic cleaning agent. The multi-channel tubular furnace is used to simultaneously heat-treat the multiple fiber bundles treated in the washing tank at a lower temperature below 400°C to synergistically remove residual sizing agent and organic cleaning agent from the fiber surface.

[0010] Preferably, the cleaning tank and / or the washing tank are provided with a multi-stage guide roller group made of the smooth rod, so that the fiber takes a W-shaped or multiple bending path in the tank, which is used to guide the fiber to increase its effective path length in the cleaning tank and / or the washing tank. And / or, the smooth rod is provided with bearings at both ends, so that the smooth rod can rotate with the traction of the fiber.

[0011] Preferably, the smooth rods are arranged in pairs at the inlet and outlet ends of the cleaning tank and / or washing tank, and the axial distance between at least one pair of rods at the outlet end is adjustable to control the immersion depth of the fiber in the cleaning solution. And / or, the smooth rod is at least one of a glass rod or a ceramic rod; And / or, the diameter of the smooth rod is 5-10 mm.

[0012] Preferably, the organic cleaning agent used in the cleaning tank is a non-volatile water-soluble organic solvent, wherein the organic solvent removes the sizing agent on the fiber surface mainly by physical dissolution, and the inorganic solvent removes the sizing agent on the fiber surface mainly by chemical reaction.

[0013] Preferably, the organic solvent includes at least one of ketone solvents, ester solvents, aromatic hydrocarbon solvents, halogenated hydrocarbon solvents, alcohol solvents, amide solvents, and ether solvents; the inorganic solvent includes at least one of alkaline solvents, acidic solvents, deionized water, and oxidizing agents.

[0014] Preferably, the ketone solvents include at least one of acetone, butanone, cyclohexanone, methyl ethyl ketone, and N-methylpyrrolidone; the ester solvents include at least one of ethyl acetate and butyl acetate; the aromatic hydrocarbon solvents include at least one of toluene and xylene; the halogenated hydrocarbon solvents include at least one of chloroform, carbon tetrachloride, and dichloromethane; the alcohol solvents include at least one of ethanol, isopropanol, and ethylene glycol; the amide solvents include at least one of dimethylformamide and dimethylacetamide; the ether solvents include tetrahydrofuran; the basic solvents include at least one of sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, and sodium bicarbonate solution; and the acidic solvents include at least one of hydrochloric acid solution, nitric acid solution, and phosphoric acid solution.

[0015] Preferably, the cleaning tank or the washing tank is not equipped with an ultrasonic device, so as to clean the fibers in a dispersed state.

[0016] Preferably, the washing tank is a counter-current washing tank, with its inlet located downstream of the fiber travel direction and its outlet located upstream; And / or, the washing tank is a running water washing tank, the water quality is deionized water, and the water temperature is controlled at 40-60℃.

[0017] Preferably, each channel of the multi-channel tube furnace has an independent temperature control unit; And / or, the multi-channel tubular furnace is provided with exhaust ports at both ends, and the exhaust ports are connected in sequence to a condenser, an activated carbon adsorption box and a spray tower through pipes; And / or, the furnace chamber of the multi-channel tubular furnace has a rectangular cross-section, and multiple quartz tubes are arranged in parallel inside to form the multi-channel structure. And / or, the openings at both ends of the multi-channel tubular furnace are slit-type openings, the height of which can accommodate the passage of flat fiber belts, and the width of which is much greater than the height.

[0018] Preferably, in any one of the multi-channel continuous adhesive removal devices described in this application, the temperature below 400°C includes a temperature of 250-350°C; and / or, the number of cleaning tanks and / or washing tanks is more than one, wherein multiple cleaning tanks are arranged as a group, or multiple washing tanks are arranged as a group, or at least one washing tank is arranged between adjacent cleaning tanks.

[0019] This application provides a multi-channel continuous desizing method for removing sizing agents from fiber surfaces, using the multi-channel continuous desizing device described in any one of this application. The method includes the following sequential steps: Cleaning step: Multiple bundles of fibers are passed through a U-shaped structure in a cleaning tank containing a cleaning agent to remove most of the sizing agent from the fiber surface. Washing step: Pass the washed bundles of fibers through a washing tank to remove residual cleaning agent from the fiber surface; Low-temperature heat treatment step: Multiple bundles of washed fibers are simultaneously passed through a multi-channel tube furnace at a temperature below 400℃ to synergistically remove residual sizing agent and cleaning agent from the fiber surface.

[0020] Preferably, in the cleaning step, the cleaning tank does not use ultrasound, the treatment temperature is 40-60℃, and the treatment time is 1-5 minutes; And / or, in the water washing step, deionized water at 40-60℃ is used for countercurrent water washing, and the treatment time is 1-5 minutes; And / or, in the low-temperature heat treatment step, the treatment temperature is 250-350℃, the treatment time is 5-10 minutes, and the generated waste gas is continuously extracted and subjected to condensation, adsorption and spray treatment. And / or, in the cleaning step, water washing step and low temperature heat treatment step, the fibers are guided by a rotatable smooth rod to reduce fiber damage.

[0021] Preferably, the fiber to be treated is carbon fiber, so as to improve the interfacial bonding strength when carbon fiber is combined with metal or resin by sequentially passing through a cleaning step, a water washing step, and a low-temperature heat treatment step.

[0022] Preferably, the method is applicable to surface treatment before fibers are composited with metals, resins, ceramics, or bio-based materials, wherein: The metal includes at least one of copper, nickel, aluminum, zinc, silver, gold, or tin; And / or, the resin includes at least one of epoxy resin, dicyclopentadiene resin, phenolic resin, nylon, polyetheretherketone or polyphenylene sulfide; And / or, the fiber includes at least one of carbon fiber, metal fiber, polyester, acrylic fiber, nylon, polypropylene, aramid, ultra-high molecular weight polyethylene fiber, PBO fiber, PBI fiber, M5 fiber, and PI fiber.

[0023] Preferably, the cleaning agent used in the cleaning step is a water-soluble organic solvent or an inorganic solvent, wherein the organic solvent removes the sizing agent from the fiber surface mainly by physical dissolution, and the inorganic solvent removes the sizing agent from the fiber surface mainly by chemical reaction.

[0024] (III) Beneficial Effects Compared with existing technologies, this application represents a significant breakthrough in the field of carbon fiber surface modification and carbon fiber composites. It can efficiently and continuously remove sizing agents from carbon fiber surfaces without damaging the original state of the carbon fibers, making it widely applicable to large-scale industrial production. This application possesses one or more of the following significant advantages: On the one hand, the fiber remains undamaged: low-temperature heat treatment (such as below 400℃) can clean the sizing agent and organic cleaning agent without damaging the carbon fiber, which can fundamentally avoid the damage of high temperature to the fiber structure and maintain the original high strength of the fiber. Secondly, it is highly efficient and continuous: the multi-channel design and fully automated continuous production greatly improve processing efficiency and are suitable for large-scale industrial applications. In three aspects, thorough cleaning: the three-step synergistic process of "organic cleaning + water washing + low-temperature heat treatment" ensures that the sizing agent is completely removed and there is no secondary pollution, providing an ideal interface for subsequent compounding. Four aspects, wide applicability: By adjusting parameters such as cleaning agent type, temperature, and time, it can be applied to the treatment of carbon fiber, metal fiber, various organic fibers, and different filament bundles (such as 1K to 50K). Five aspects: environmental protection and safety: using non-volatile water-soluble organic cleaning agents and equipped with a complete waste gas treatment system, the production process is safe and environmentally friendly. Attached Figure Description

[0025] Figure 1 This is a top view of the multi-channel continuous adhesive removal device in this application; Figure 2 This is a schematic cross-sectional view of the multi-channel continuous degumming device in this application; Figure 3a , Figure 3b , Figure 3c This is a schematic diagram of SEM images of three 12K fiber precursor samples in this application; Figure 4a , Figure 4b , Figure 4c They are Figure 3a , Figure 3b , Figure 3c A schematic diagram of the SEM image of the composite product formed from the corresponding fiber filaments. Detailed Implementation

[0026] The technical solution of this application will be fully and clearly described below with reference to the accompanying drawings and through multiple detailed embodiments and comparative examples. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] High-performance fibers such as carbon fiber and aramid fiber are widely used in high-tech fields such as aerospace and new energy vehicles due to their excellent mechanical properties. To protect the fibers and improve their performance in subsequent processing, a sizing agent is usually coated on the fiber surface at the time of manufacture. However, this sizing agent often becomes an obstacle to the bonding between the fiber and the resin or metal matrix during the preparation of composite materials. Therefore, removing the original sizing agent from the fiber surface becomes a crucial step in achieving precise control and optimization of the fiber-resin or fiber-metal interface. Its core importance is mainly reflected in the following aspects: (1) Optimizing fiber-metal interface bonding: Metal-based carbon fiber composites inherit the excellent properties of carbon fibers while maintaining the characteristics of the matrix metal, making them a research hotspot in recent years. However, the problem of debinding carbon fibers remains the number one technical challenge in this field. (2) Optimize fiber-resin interface bonding: The composition of the original sizing agent may not be optimal for the specific resin matrix to be used in the end; (3) Solving the wettability problem: The original sizing agent may hinder the resin from fully wetting and penetrating the fiber monofilament, forming weak interfaces or defect points; (4) Solving the chemical compatibility problem: The chemical properties of the original sizing agent may be incompatible with the target resin system, resulting in weak interfacial chemical bonding; (5) Solving the problem of physical bonding: It affects the surface morphology of the fiber, and thus affects the physical interlocking between the resin and the fiber; (6) Achieve post-treatment removal: After removing the sizing agent, active functional groups that are more conducive to the binding of the target resin can be introduced on the fiber surface, thereby improving the interfacial performance; (7) Ensure the controllability and consistency of interface performance: Removing the original sizing agent is an important means to establish a unified and controllable interface starting point, and ensure the stability of product performance; (8) Improve the reliability of composite material quality: reduce the risk of failure such as interface debonding and delamination, and improve long-term service reliability; (9) Meet specific research or application needs: such as basic research, recycling of carbon fiber and special process requirements.

[0028] However, while some existing technologies (such as patent documents CN202122551187.2, CN202311403452.X, CN202111189919.9, etc.) disclose some continuous processing methods, they still fail to effectively remove the original sizing agent from the fiber surface. Furthermore, although some existing technologies (such as patent documents CN202010391624.6, CN202111189919.6, etc.) combine soaking and heat treatment, the heat treatment temperature still needs to be quite high (all requiring temperatures well above 400℃, such as 500-700℃, or even higher). High-temperature treatment can still damage the fibers, and the overall processing flow is lengthy. It should be noted that using high temperatures (e.g., temperatures ranging from 400-700℃, depending on the manufacturer and model of the carbon fiber, the required temperature needs to be determined based on the degumming state of the carbon fiber) to thermally decompose and carbonize organic sizing agents (such as epoxy resin, polyurethane, etc.) and then using ultrasonic cleaning or light brushing to remove residual carbon deposits after cooling, the degumming efficiency and effect are generally low, and it is very easy to damage the carbon fiber surface, resulting in a large number of broken fibers, which affects the performance and quality of the composite materials made later.

[0029] Furthermore, existing processing methods are mostly single-channel or intermittent, resulting in low processing efficiency and failing to meet the efficiency and consistency requirements of large-scale industrial production. In particular, for large-tow fibers, existing methods cannot ensure that the internal fibers are effectively and uniformly cleaned, and the fibers are easily damaged during processing due to friction, uneven tension, and other reasons.

[0030] Therefore, there is an urgent need in the field for an apparatus and method that can efficiently, continuously, and non-destructively remove sizing agents from fiber surfaces and is suitable for large-scale industrial production.

[0031] Based on this, this application adopts the following core technical concept: First, through research and improvement, the inventors realized that simply relying on "violent" methods such as increasing temperature or extending soaking time to remove sizing agents inevitably comes at the cost of sacrificing fiber performance. Therefore, this application considers a "step-by-step synergistic, gentle removal" strategy. The core idea is: first, use a cleaning agent to dissolve and remove most of the sizing agent (main removal); then, wash with water to remove the residual, water-soluble cleaning agent (intermediate cleaning); finally, use a low-temperature heat treatment at a temperature far lower than the traditional pyrolysis temperature to thoroughly remove the remaining trace amounts of sizing agent and cleaning agent (fine treatment and activation).

[0032] Since the washing and rinsing steps remove most of the organic matter from the sizing agent, leaving very little residue, the sizing agent and cleaning agent can be completely removed without high temperature, thus protecting the fibers from damage during processing.

[0033] Secondly, this application proposes an innovative device structure and process flow. (Reference) Figure 1 and Figure 2 As can be seen, the technical solution provided in this application is embodied in the following ways: On the one hand, the multi-channel design and continuous operation: To achieve industrial-scale production capacity, the equipment is designed from start to finish to process multiple fiber bundles simultaneously. From feeding, guiding, cleaning, washing, heat treatment to take-up, the entire process is carried out continuously and seamlessly.

[0034] Secondly, the non-destructive guiding system: the fibers need to change direction and stress state multiple times throughout the process. To address this, this application incorporates rotatable smooth rods at all critical turning points. The core functions of these rods are: a) to transform the sliding friction between the fibers and the guide into rolling friction, greatly reducing friction and wear; b) through proper arrangement, to allow the tightly packed fiber bundles to unfold into a flat shape in the liquid, ensuring that the internal fibers can also fully contact the cleaning medium, thus solving the problem of cleaning the interior of large fiber bundles.

[0035] In three aspects, the equipment structure for implementing the process steps adopts a sequentially arranged cleaning tank, washing tank, and multi-channel tube furnace. The cleaning tank features a U-shaped internal design, allowing fibers to pass through without simply immersing them. This significantly extends the effective path and processing time of the fibers in the cleaning solution without increasing the equipment's footprint, ensuring effective cleaning. The washing tank uses clean water to contact and remove organic solvents from the fiber surface. The multi-channel tube furnace only needs to operate at a low temperature below 400℃, and its multi-channel design ensures uniform heating of each fiber bundle.

[0036] In summary, this application proposes a continuous processing line operation scheme of "step-by-step collaboration and multi-channel parallelism". Its core lies in decomposing the complex degumming task into three functionally distinct and interconnected steps, and designing corresponding device modules to enable multiple fiber bundles to complete the entire process simultaneously and continuously. This not only results in high-quality and efficient degumming, but is also very suitable for large-scale production in factories.

[0037] The implementation of the technical concept of this application will be illustrated below with reference to the accompanying drawings and through multiple embodiments.

[0038] Example 1: Multi-channel continuous adhesive removal device and basic adhesive removal process Existing fiber degumming technologies cannot simultaneously achieve the goals of "continuous operation, high efficiency, fiber non-destruction, and suitability for industrial production." Furthermore, intermittent processing and single-channel designs are inefficient, and high-temperature or strong chemical treatments can easily damage the fibers.

[0039] This embodiment adopts a continuous processing pipeline of "step-by-step collaboration and multi-channel parallelism". By decomposing the complex degumming task into three functionally distinct and interconnected steps, and designing corresponding device modules, multiple fiber bundles can complete the entire degumming process simultaneously and continuously.

[0040] refer to Figure 1 and Figure 2 The multi-channel continuous degumming device of this application includes a wire feeding device (not shown in the figure), a cleaning tank 20, a washing tank 30, a multi-channel tubular furnace 40, and a wire take-up device (not shown in the figure) arranged sequentially along the fiber travel direction. The inlet and outlet of the cleaning tank 20, the washing tank 30, and the multi-channel tubular furnace 40 are all equipped with guide rollers (smooth, corrosion-resistant rods are acceptable, such as smooth glass rods) to ensure that multiple bundles of fibers 10 can pass through the entire system in parallel and synchronously.

[0041] In practice, the cleaning tank 20 is equipped with a U-shaped tank, which contains an organic cleaning agent (N-methylpyrrolidone is used in this embodiment). The liquid level ensures that the fiber 10 can be completely submerged at the bottom of the U-shaped tank, for example, the effective path length of the fiber 10 in the tank is about 3 meters.

[0042] In practice, the washing tank 30 is an open tank filled with deionized water for rinsing the fibers 10 that have exited the washing tank. Similarly, the liquid level is designed to ensure that the fibers 10 are completely submerged at the bottom of the tank, for example, allowing the effective path length of the fibers 10 within the tank to be approximately 5 meters.

[0043] In practice, the multi-channel tube furnace 40 adopts multi-stage independent heating, such as a three-stage independent design, forming three independent channels within the furnace chamber through two high-temperature resistant quartz tubes (see...). Figure 1 The dotted line diagram of the multi-channel tubular furnace is shown to ensure that the three fiber bundles do not interfere with each other during heat treatment. The tubular furnace has exhaust vents 401 at both ends, which are connected to the condenser, activated carbon adsorption box, and spray tower (not shown in the diagram) at the rear end via pipes.

[0044] In practice, both the inlet and outlet ends of the cleaning tank 20 and the washing tank 30 are equipped with a pair of rotatable smooth rods 50 (e.g., made of alumina ceramic with a diameter of 8mm). The fiber 10 passes between the pair of rods, and the two ends of the rods are installed through bearing seats and can rotate freely.

[0045] The organic cleaning process is carried out in the cleaning tank 20: Three bundles of fibers 10 (such as 12K carbon fiber) pass through the 50°C cleaning tank at a speed of 5m / min for about 4.8 minutes. The organic solvent can effectively dissolve and remove more than 95% of the epoxy sizing agent on the fiber surface.

[0046] The washing process is carried out in the washing tank 30: the fiber 10 is then placed in a deionized water washing tank at 50°C for about 3 minutes, which can wash away a large amount of organic solvents adhering to the fiber surface.

[0047] Furthermore, a low-temperature heat treatment step is performed in a multi-channel tube furnace 40: the fiber 10 enters the tube furnace set at 330°C, and the treatment time is approximately 6 minutes. By utilizing relatively low temperatures (e.g., 250-350°C), the trace amounts of sizing agent, organic solvents, and moisture remaining on the fiber surface are thoroughly decomposed and removed, while simultaneously activating the fiber surface. After two steps of cleaning and rinsing, only trace amounts of sizing agent, cleaning agent, or moisture remain on the fiber surface, thus low temperatures are sufficient to allow these trace residues to decompose or volatilize through thermal decomposition, eliminating the need for traditional high temperatures. In addition, temperatures below 400°C can selectively oxidize the fiber surface, resulting in gentle surface activation. By introducing oxygen-containing functional groups, the surface energy is increased without causing damage to the bulk structure.

[0048] This application aims to remove sizing agent from the surface of carbon fibers, ensuring excellent interfacial bonding strength and stability when combined with other materials (resin, metal) to form composites, thereby improving the performance, reliability, and consistency of the composite material. Automatic wire feeding and take-up devices are installed before and after the equipment. Smooth glass rods (any smooth, corrosion-resistant rod material is acceptable) are provided at both the inlet and outlet ends of the cleaning tank to prevent fiber scratching and breakage. A U-shaped structure is designed in the tank to effectively enhance the cleaning power of the cleaning agent. After the fibers emerge from the cleaning solution, they enter a water washing tank to remove most of the organic cleaning solution carried over to the fiber surface, and then enter a multi-channel open tubular... The furnace has hollow sections and exhaust vents at the front and rear to extract organic waste gas from the furnace. The waste gas is then connected to a waste gas treatment system (spray tower). Compared to traditional desizing methods, this application only requires adjusting the temperature to below 400℃ (e.g., around 250-350℃) to effectively remove a small amount of organic cleaning agent and residual sizing agent from the fiber surface. This is far lower than the traditional 500-700℃, which can remove the sizing agent while ensuring that the fiber is not oxidized or structurally damaged. This overcomes all the shortcomings of existing methods and can perfectly remove the sizing agent from the carbon fiber surface without damaging the original state of the carbon fiber. This represents a major breakthrough in the field of carbon fiber surface modification and carbon fiber composites.

[0049] In summary, after undergoing organic cleaning, water washing, and low-temperature thermal decomposition processes, the carbon fiber surface is clean, the monofilaments are well dispersed, and after being made into epoxy resin composite materials, its interlaminar shear strength (ILSS) increases from 75 MPa to 118 MPa without damage to fiber strength and the fiber breakage rate is less than 0.5%.

[0050] Table 1. Mechanical test results of 12k carbon fiber after traditional oven degumming.

[0051] Table 2 Mechanical test results of 12k carbon fiber after using the degumming method of this application

[0052] refer to Figures 3a to 4c As shown in Tables 1 and 2, the results clearly demonstrate that the surface metal layer of the fiber is very smooth and uniform after treatment with the technical solution of this application. According to the test results of mechanical and electrical properties, the surface stability is very good, which can meet the needs of various applications. This verifies that the adhesive removal solution of this application has very good adaptability and rationality, and the technical effect is more advantageous than the traditional solution.

[0053] In the above examples, N-methylpyrrolidone, a preferred organic ketone solvent, is used as an illustrative example. In some preferred examples of this application, the cleaning agent may preferably be a water-soluble organic solvent or an inorganic solvent. The "water-soluble" characteristic of this invention solves two traditional paradoxes in continuous degumming processes: First, the paradox of "dissolution efficiency" versus "solvent residue": traditional solvent methods often use strong solvents for efficient dissolution, but these are difficult to remove subsequently. This application solves this contradiction at the molecular design level by selecting a solvent that is both highly efficient and easily removed by water. Second, the paradox of "thorough degumming" versus "fiber damage": traditional methods use high temperatures or strong chemical attacks for thoroughness, inevitably damaging the fibers. This application uses a relay-synergistic approach of "dissolution-transfer (water washing)-low-temperature decomposition" to gradually decompose and complete the degumming task, with different steps completed in the gentlest manner, ultimately achieving an ultra-clean interface without damaging the fibers.

[0054] In practice, organic solvents primarily remove sizing agents from the fiber surface through physical dissolution. Organic solvents mainly function through physical dissolution, utilizing the principle of "like dissolves like." Since most sizing agents (such as epoxy resins, polyurethanes, and acrylates) are high-molecular-weight organic compounds, highly polar aprotic solvents such as N-methylpyrrolidone (NMP), dimethylformamide (DMF), and dimethylacetamide (DMAc) are preferred. Their molecular structures are similar to the polar groups (such as ester groups) of many sizing agents, effectively "surrounding" and breaking down the forces between the sizing agent molecular chains (such as van der Waals forces and hydrogen bonds) through strong polar interactions and hydrogen bonding. This causes the sizing agent to dissolve or at least swell significantly. Specifically, solvent molecules penetrate the interface between the sizing agent and the fiber, and even into the sizing agent coating, thereby reducing the cohesive strength and adhesion of the sizing agent through dissolution or swelling. Furthermore, with continuous solvent penetration, the entire sizing layer or its main components can dissociate from the fiber surface and disperse into the solvent.

[0055] In practice, inorganic solvents primarily remove sizing agents from the fiber surface through chemical reactions, decomposing the sizing agents mainly through chemical reactions. In preferred examples, the inorganic solvent can be at least one of alkaline solvents, acidic solvents, deionized water, and oxidants. For example, acidic solvents can directly break the molecular chains of sizing agents (especially epoxy and alkyd resins) through dehydration, sulfonation, and oxidation reactions, causing them to carbonize or transform into water-soluble small molecules. For example, alkaline solvents can undergo saponification or hydrolysis reactions on certain types of sizing agents (such as polyesters and polyurethanes), breaking ester or urethane bonds in their molecular chains and generating water-soluble substances that cause the sizing agent to detach from the fiber surface. For example, deionized water and oxidant solutions can destroy certain groups in the molecular structure of the sizing agent through ionic reactions, causing its molecular chains to break and making it easier to peel off.

[0056] In preferred embodiments, the water-soluble organic and inorganic solvents may be selected from the following solvents: ketone solvents including at least one of acetone, butanone, cyclohexanone, methyl ethyl ketone, and N-methylpyrrolidone; ester solvents including at least one of ethyl acetate and butyl acetate; aromatic hydrocarbon solvents including at least one of toluene and xylene; halogenated hydrocarbon solvents including at least one of chloroform, carbon tetrachloride, and dichloromethane; alcohol solvents including at least one of ethanol, isopropanol, and ethylene glycol; amide solvents including at least one of dimethylformamide and dimethylacetamide; ether solvents including tetrahydrofuran; basic solvents including at least one of sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, and sodium bicarbonate solution; and acidic solvents including at least one of hydrochloric acid solution, nitric acid solution, and phosphoric acid solution.

[0057] In summary, the fibers in this application can have the sizing agent removed by the cleaning agent in the cleaning tank 20 through physical or chemical means. After entering the washing tank 30, the residual cleaning solvent can be easily dissolved and rinsed clean by water. The cleaning agent, and even small amounts of sizing agent residue, can be removed simply by washing with water in the washing tank. Therefore, in the subsequent processing, only low-temperature heat treatment is needed to complete the fiber sizing process. That is, the multi-channel tube furnace 40 in the later process does not need to operate at the high-temperature working temperature of traditional pyrolysis treatment (i.e., above 400℃, such as 500-700℃), but only needs to operate at a low-temperature working temperature (i.e., below 400℃, such as 250-350℃), which can clean the fibers while protecting them from high-temperature damage. It should be noted that the water in the washing tank can refer to conventional water or deionized water or other industrially commonly used water.

[0058] This application selects organic or inorganic solvents that are highly efficient and easily removed by water, ensuring a smooth transition from "cleaning" to "washing" and then to "low-temperature pyrolysis" in the processing technology. This approach, from a molecular design perspective, takes into account the advantages of efficient and clean removal while minimizing damage to fibers.

[0059] In some embodiments, the multi-channel tube furnace of this application operates at a temperature below 400°C, with a preferred temperature range including 250-350°C. It should be noted that after the two-step cleaning process (washing tank and rinsing tank), if the residue on the fiber surface (such as sizing agent, cleaning agent, or moisture) is very small, the temperature can be set even lower to thermally decompose these residues; for example, 100°C can quickly evaporate the residual moisture. Therefore, the operating temperature setting of the multi-channel tube furnace can be set and adjusted according to the needs of the production process.

[0060] In some implementation examples, there can be one or more washing tanks and rinsing tanks. For example, multiple washing tanks can be provided (i.e., more than one), allowing the fibers to undergo multiple cleaning processes with the cleaning agent, further improving the removal effect and efficiency of the sizing agent. Similarly, multiple rinsing tanks can be provided (i.e., more than one), allowing the fibers to undergo multiple rinsing processes with the water, further improving the removal effect and efficiency of sizing agent, cleaning agent, and other residues. Furthermore, when using more than one washing tank and more than one rinsing tank, the multiple washing tanks can be arranged as a group of washing tanks, or the multiple rinsing tanks can be arranged as a group of rinsing tanks, or the rinsing tanks can be arranged between adjacent washing tanks, etc.

[0061] By utilizing multiple cleaning tanks and washing tanks, the fibers can undergo multiple cleaning treatments with cleaning agents and water, which can improve the removal effect of sizing agents and further reduce the residues on the fiber surface (such as sizing agents, cleaning agents, moisture, etc.). This results in even less residue on the fiber surface before entering the tube furnace, allowing the multi-channel tube furnace to operate at a lower pyrolysis temperature to complete the final pyrolysis treatment. The lower pyrolysis temperature can better protect the fibers from damage caused by high-temperature heat treatment.

[0062] Example 2: Guide Roller Assembly and Path Optimization When using a simple straight-line passing or single-bending method, the fiber stays in the liquid tank for a relatively short time, and the interior of large fiber bundles is difficult to be fully wetted by the cleaning liquid, so the degumming effect needs to be improved.

[0063] Referring to the above Figure 1 and Figure 2As illustrated, this embodiment sets up a "guide roller group" composed of rotatable smooth rods 50 inside the liquid tank, so that the fibers form multiple bending paths (such as U-shape, W-shape, M-shape, etc.) in the tank. Without increasing the length of the equipment, the effective path can be extended several times, which improves the processing time of the fibers in the liquid tank. Moreover, it can force the fiber bundle to repeatedly change shape at the bending points, promoting the exposure of the internal fibers to the cleaning medium.

[0064] For example, two sets of guide rollers, each consisting of three smooth ceramic rods, are added inside the cleaning tank 20. After the fiber enters the tank, it first passes downwards around the first rod, then upwards around the second, and then downwards around the third before exiting the tank, forming a "W-shaped" path, effectively increasing the effective path length. For instance, in a 4-meter-long tank, after passing through the guide roller sets, the actual path length of the fiber can be extended to approximately 10 meters, thus significantly increasing the processing time of the fiber in the liquid tank.

[0065] For example, by using the same "W-shaped" guide roller design in the washing tank 30, the 12K large-tow carbon fibers were effectively "unfolded" during the washing process, and the removal rate of sizing agent from the internal fibers increased from about 90% in Example 1 to over 98%. The washing efficiency was also improved simultaneously, and the amount of residues (such as N-methylpyrrolidone NMP) detected was reduced by about 70%.

[0066] Example 3: Preferred example of a rotatable bar The fixed guide rod and the fiber usually operate through sliding friction. Even if the guide rod surface is smooth, it is prone to fiber damage such as fuzzing and breakage under continuous high-speed operation. At the same time, it is impossible to adjust the fiber according to the width and tension requirements of different filament bundles.

[0067] In this embodiment, the guide is designed as a "rotatable" structure, changing sliding friction to rolling friction. Furthermore, it is designed with "adjustable distance" to precisely control the fiber's immersion state and running tension in the liquid.

[0068] In practice, both ends of the smooth bar 50 are mounted in bearing housings via deep groove ball bearings (not shown in the figure) to ensure that it can be flexibly rotated by fiber traction.

[0069] In the example, at the outlet end of the cleaning tank 20, one of a pair of rods is mounted on a sliding bearing seat. The axial distance D between the two rods can be precisely adjusted by a drive mechanism (such as a screw mechanism). When the distance D is reduced, the immersion depth of the fiber in the liquid tank increases, the bending is more intense, and the cleaning effect is enhanced, thus increasing the tension. When the distance D is increased, the cleaning and tension effects are exactly opposite.

[0070] The rolling friction design reduces fiber wear by more than 85%. Furthermore, by adjusting the distance D between the lead-out rods, the process can be optimized for fibers of different specifications (such as 1K and 50K). For 50K large filament bundles, appropriately increasing the distance can prevent excessive bending and tension, ensuring the stability and versatility of the processing.

[0071] Example 4: Preferred examples of cleaning agents and preferred designs without ultrasonic cleaning Some cleaning agents (such as acetone) have low boiling points, are easily volatile, are unsafe, and are difficult to maintain concentration in open tanks. In addition, although existing technologies use ultrasonic-assisted cleaning, which is effective, the energy is difficult to control precisely, and it is easy to scatter or break brittle carbon fiber monofilaments.

[0072] This embodiment selects a "non-volatile water-soluble organic solvent" as the main cleaning agent, balancing cleaning efficiency and operational safety. Furthermore, it abandons ultrasonic waves, relying entirely on the solvent's own dissolving power. This can be further combined with the mechanical path designs described in embodiments 2 and 3 above to achieve more uniform, gentler, and more efficient cleaning.

[0073] This embodiment compares three different organic cleaning agents: acetone, N-methylpyrrolidone (NMP), and dimethylacetamide (DMAc), operated under identical equipment (excluding ultrasonics) and process parameters.

[0074] Acetone: The evaporation loss is slightly greater, and the concentration in the tank decreases with increasing usage time, resulting in a decrease in degumming efficiency and effectiveness.

[0075] NMP and DMAc: The bath solutions are stable, and the degumming effect is consistently good. In particular, their water solubility allows for efficient removal of residues in subsequent washing steps. Chromatographic analysis of the treated fiber surface showed no detectable harmful solvent residues. No fiber breakage due to mechanical impact occurred throughout the entire process.

[0076] Example 5: The preferred washing tank uses a counter-current type and warm water washing method. The efficiency of simple immersion washing needs to be improved, and the water consumption is large. In addition, the effect of removing certain high-boiling-point organic cleaning agents in cold water also needs to be improved.

[0077] This embodiment employs the principle of "countercurrent," allowing the cleanest water to come into contact with the cleanest fibers, thus achieving efficient water resource utilization. Simultaneously, using "warm water (40-60℃)" for cleaning improves the solubility and diffusion rate of the cleaning agent in water.

[0078] In practice, the washing tank 30 is modified to a counter-current type, with the inlet (not shown in the figure) located at the end of the washing tank closer to the tubular furnace (downstream), and the outlet (not shown in the figure) located at the end farther away from the tubular furnace (upstream). The fiber travel direction is opposite to the water flow direction.

[0079] The water temperature is maintained at 50±2℃ by the heating coil and thermostat (not shown in the figure) inside the tank.

[0080] Tests have shown that compared to non-reverse flow water washing at the same temperature, water consumption can be reduced by approximately 60% to achieve the same level of cleanliness (based on residual NMP on the surface). Furthermore, warm water washing is approximately twice as efficient as room temperature (25°C) washing.

[0081] Example 6: Optimal Design of Multi-Channel Tubular Furnace and Example of Waste Gas Treatment When multiple bundles of fibers are heat-treated in the same furnace, they may be heated unevenly due to their different positions; the direct emission of organic waste gas generated during heat treatment will cause environmental pollution.

[0082] This example physically divides the furnace into independent channels using "baffles" and can be configured with "independent temperature control" to compensate for edge effects. A "staged waste gas treatment system" is designed to first condense and recover some organic matter from the waste gas, then adsorb it, and finally spray it to neutralize it, achieving emission standards.

[0083] In practice, three quartz tubes are arranged in parallel inside the rectangular furnace chamber of the multi-channel tube furnace 40, forming three channels. Each channel corresponds to an independent heating element and thermocouple (not shown in the figure).

[0084] In addition, the exhaust vent 401 is connected in sequence via pipes to: a condenser (to condense and recover high-boiling-point organic vapors) → an activated carbon adsorption box (to adsorb low-boiling-point organic compounds) → an alkaline spray tower (to treat any acidic gases that may be generated).

[0085] In the example, the openings at both ends of the furnace body are designed as slit openings, for example, only 15mm high and the same width as the furnace chamber, which facilitates the passage of flat fiber belts and minimizes the loss of heat and the escape of exhaust gas inside the furnace.

[0086] By structurally improving the multi-channel tubular furnace, the temperature deviation of the fibers at the three outlets is small (e.g., less than ±5℃), resulting in consistent and good performance. Furthermore, after treatment, the concentration of non-methane total hydrocarbons in the exhaust gas is far below emission requirements, achieving the goal of harmless and pollution-free production. Additionally, the slit-type design reduces furnace energy consumption by approximately 15%, achieving excellent energy-saving and production-increasing effects.

[0087] Example 7: Parameter Optimization Design and Control Example By clearly defining the optimal key process parameter windows for each step and component, the best balance between efficiency and effectiveness can be achieved.

[0088] Through numerous experiments, this embodiment determined the organic cleaning and water washing parameters for "low temperature and short time", as well as the heat treatment parameters for "specific low temperature range and short time". These parameters work synergistically with the characteristics of the device to maximize production efficiency and fiber protection while ensuring the degumming effect.

[0089] The apparatus of Example 1 was used to process 3K carbon fiber, with the following specific parameters: Organic cleaning steps: The cleaning agent is DMAc, the temperature is 55℃, the processing time of the fibers in the "W" shaped path in the tank is controlled to 4 minutes, and ultrasonic equipment is not used.

[0090] Washing steps: Use 55℃ deionized water for counter-current rinsing, and control the treatment time to 4 minutes.

[0091] Low-temperature heat treatment step: The tube furnace temperature is set to 340℃, and the fiber residence time is 6 minutes. Simultaneously, the waste gas treatment system runs continuously, extracting and treating all generated waste gas.

[0092] With the above optimized parameter combination, the production line speed can be increased to 6m / min, and the tensile strength retention rate of the treated T800 fiber is as high as 99.5%, achieving the best interfacial performance when combined with PEEK resin.

[0093] Example 8: Examples of fiber application treatment Carbon fiber is the most commonly used reinforcement in composite materials, but its surface inertness and interfacial bonding with resin / metal are common challenges in the industry. Traditional debinding methods, while improving the interface, often damage the fiber itself.

[0094] Based on the complete set of devices and processing procedures provided in this application, this embodiment provides a "clean, undamaged, and active" surface for carbon fiber, thereby fundamentally solving the problem of weak interfacial bonding.

[0095] In the example, the technical solutions provided in this application (such as the parameters in Example 7) and the traditional 400℃ pyrolysis method were used to treat T300 carbon fiber, which was then compounded with epoxy resin.

[0096] Comparative results: The sample treated in this application exhibits a composite interfacial shear strength (IFSS) of 102 MPa. The sample treated by the traditional pyrolysis method shows an IFSS of 85 MPa, with a 15% decrease in fiber strength.

[0097] Therefore, this application can significantly improve the interfacial bonding strength between carbon fiber and resin while perfectly protecting the properties of the fiber itself.

[0098] This application is not limited to the aforementioned carbon fibers, as its core concept of "dissolution-rinsing-mild thermal activation" is widely applicable to the preparation of various fibers and their composites. Therefore, this application applies to: (1) Removal of adhesive from carbon fiber, metal fiber (stainless steel fiber), organic fiber (which may include: polyester, acrylic, nylon, polypropylene, aramid, ultra-high molecular weight polyethylene fiber, poly(p-phenylene benzobisoxazole) fiber (PBO fiber), poly(p-phenylene benzoimidazole) fiber (PBI fiber), poly(p-phenylene pyridinium diimidazole) fiber (M5 fiber), polyimide fiber (PI fiber)) and other wires that require sizing or have sizing agents; (2) Any of the above wires that are de-adhesived and then used as composites, such as composites with metals (copper, nickel, aluminum, zinc, silver, gold, tin, etc.), composites with resins (epoxy resin (EP)), dicyclopentadiene (DCPD) resin, phenolic resin, nylon (PA6 / PA66), polyether ether ketone (PEEK), polyphenylene sulfide (PPS), and composites with ceramics, bio-based materials, etc. (3) Cleaning agents include: organic cleaning agents (such as acetone, butanone (MEK), cyclohexanone, N-methylpyrrolidone (NMP), methylformamide (DMF) / dimethylacetamide (DMAc), etc.), and inorganic cleaning agents (such as acids, alkalis, deionized water, oxidants, etc.). (4) Applicable to any fiber with sizing agent tow (such as 1k, 1.5k, 3k, 6k, 12k, 24k, 48k, 50k and other fibers).

[0099] For example, fiber-metal composites. Stainless steel fibers were successfully processed for composite with an aluminum matrix. On one hand, the cleaning agent effectively removed the lubricant from the drawing process, water washing cleaned the solvent, and low-temperature heat treatment removed organic matter and formed an active layer on the surface that facilitates metal diffusion and bonding.

[0100] For example, fibers are compounded with high-performance resins. PBO fibers were successfully treated for compounding with dicyclopentadiene (DCPD) resin. By selecting appropriate cleaning agents and using low temperatures, the sizing agent was removed while avoiding damage to its microstructure.

[0101] For example, fiber-ceramic composites. Carbon fiber bundles were successfully processed for the preparation of carbon fiber reinforced silicon carbide (C / SiC) ceramic matrix composites. The clean, undamaged fiber surface provides an ideal precursor for chemical vapor infiltration (CVI) processes.

[0102] The following comparative examples further illustrate the innovation of this application.

[0103] Comparative Example 1: The effect of reversing the order of steps The process of Example 1 was changed to: first perform heat treatment at 330°C, then perform NMP cleaning and water washing.

[0104] Results: During heat treatment, a large amount of sizing agent carbonized at high temperatures, forming a solid carbonaceous residue that was difficult for NMP to dissolve. Ultimately, the fiber surface had numerous stains, resulting in extremely poor interfacial properties. Therefore, this demonstrates the non-obviousness and synergistic necessity of the "cleaning first, then low-temperature heat treatment" step sequence.

[0105] Comparative Example 2: The Effect of Excessively High Heat Treatment Temperature The temperature of the tubular furnace in Example 1 was set to 450°C.

[0106] Results: Significant etching and oxidation were observed on the carbon fiber surface, resulting in a 18% decrease in single-filament tensile strength and a significant increase in fiber breakage rate. Therefore, it can be demonstrated that strictly controlling the heat treatment temperature below 350℃ is crucial for fiber protection.

[0107] Comparative Example 3: The effect of omitting the water rinsing step on the cleaning effect In Example 1, the water washing step in the water washing tank is eliminated. That is, after the cleaning agent cleaning step is completed in the cleaning tank, the material is directly put into the multi-channel tube furnace for pyrolysis treatment.

[0108] Result: The solvent remaining on the fiber surface further contaminated the fiber during pyrolysis, and even caused a decline in fiber performance.

[0109] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the descriptions of the embodiments described later are relatively simple, and relevant parts can be referred to the descriptions of the foregoing embodiments.

[0110] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A multi-channel continuous degumming device for removing sizing agents from fiber surfaces, characterized in that, The system includes a cleaning tank, a washing tank, and a multi-channel tube furnace arranged sequentially. Both the inlet and outlet ends of the cleaning tank and the washing tank are equipped with several rotatable smooth rods, which simultaneously guide multiple fiber bundles and reduce fiber surface damage. The cleaning tank has a U-shaped structure inside to hold a cleaning agent, allowing the multiple fiber bundles between the inlet and outlet ends to be immersed in the cleaning agent, thus cleaning the sizing agent from the fiber surface. The washing tank is used to wash the multiple fiber bundles treated in the cleaning tank to remove residual cleaning agent. The multi-channel tube furnace is used to simultaneously heat-treat the multiple fiber bundles treated in the washing tank at a temperature below 400°C to synergistically remove residual sizing agent and cleaning agent from the fiber surface.

2. The multi-channel continuous adhesive removal device according to claim 1, characterized in that, The cleaning tank and / or the washing tank are provided with a multi-stage guide roller group made of the smooth rod material, so that the fiber takes a W-shaped or multiple bending path in the tank, which is used to guide the fiber to increase its effective path length in the cleaning tank and / or the washing tank. And / or, the smooth rod is provided with bearings at both ends, so that the smooth rod can rotate with the traction of the fiber.

3. The multi-channel continuous adhesive removal device according to claim 2, characterized in that, The smooth rods are arranged in pairs at the inlet and outlet ends of the cleaning tank and / or washing tank, and the axial distance between at least one pair of rods at the outlet end is adjustable to control the immersion depth of the fiber in the cleaning solution. And / or, the smooth rod is at least one of a glass rod or a ceramic rod; And / or, the diameter of the smooth rod is 5-10 mm.

4. The multi-channel continuous adhesive removal device according to claim 1, characterized in that, The cleaning agent used in the cleaning tank is a water-soluble organic solvent or an inorganic solvent. The organic solvent removes the sizing agent from the fiber surface mainly by physical dissolution, while the inorganic solvent removes the sizing agent from the fiber surface mainly by chemical reaction.

5. The multi-channel continuous adhesive removal device according to claim 4, characterized in that, Organic solvents include at least one of ketone solvents, ester solvents, aromatic hydrocarbon solvents, halogenated hydrocarbon solvents, alcohol solvents, amide solvents, and ether solvents; inorganic solvents include at least one of alkaline solvents, acidic solvents, deionized water, and oxidizing agents.

6. The multi-channel continuous adhesive removal device according to claim 5, characterized in that, Ketone solvents include at least one of acetone, butanone, cyclohexanone, methyl ethyl ketone, and N-methylpyrrolidone; ester solvents include at least one of ethyl acetate and butyl acetate; aromatic hydrocarbon solvents include at least one of toluene and xylene; halogenated hydrocarbon solvents include at least one of chloroform, carbon tetrachloride, and dichloromethane; alcohol solvents include at least one of ethanol, isopropanol, and ethylene glycol; amide solvents include at least one of dimethylformamide and dimethylacetamide; ether solvents include tetrahydrofuran; basic solvents include at least one of sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, and sodium bicarbonate solution; and acidic solvents include at least one of hydrochloric acid solution, nitric acid solution, and phosphoric acid solution.

7. The multi-channel continuous adhesive removal device according to claim 1, characterized in that, The washing tank is a counter-current washing tank, with its inlet located downstream of the fiber travel direction and its outlet located upstream. And / or, the water washing tank is for running water cleaning, the water quality is deionized water, and the water temperature is controlled at 40-60℃; And / or, no ultrasonic device is provided in the cleaning tank or the washing tank to clean the fibers in a dispersed state; And / or, each channel of the multi-channel tube furnace has an independent temperature control unit; And / or, the multi-channel tubular furnace is provided with exhaust ports at both ends, and the exhaust ports are connected in sequence to a condenser, an activated carbon adsorption box and a spray tower through pipes; And / or, the furnace chamber of the multi-channel tubular furnace has a rectangular cross-section, and multiple quartz tubes are arranged in parallel inside to form the multi-channel structure. And / or, the openings at both ends of the multi-channel tubular furnace are slit-type openings, the height of which can accommodate the passage of flat fiber belts, and the width of which is much greater than the height.

8. The multi-channel continuous adhesive removal device according to any one of claims 1-7, characterized in that, Temperatures below 400℃ include temperatures between 250-350℃; And / or, the number of cleaning tanks and / or washing tanks is more than one, wherein multiple cleaning tanks are set as a group, or multiple washing tanks are set as a group, or at least one washing tank is set between adjacent cleaning tanks.

9. A multi-channel continuous degumming method for removing sizing agents from fiber surfaces, characterized in that, The method using the multi-channel continuous degumming apparatus according to any one of claims 1-8 comprises the following steps performed in sequence: Cleaning step: Multiple bundles of fibers are passed through a U-shaped structure in a cleaning tank containing a cleaning agent to remove most of the sizing agent from the fiber surface. Washing step: Pass the washed bundles of fibers through a washing tank to remove residual cleaning agent from the fiber surface; Low-temperature heat treatment step: Multiple bundles of washed fibers are simultaneously passed through a multi-channel tube furnace at a temperature below 400℃ to synergistically remove residual sizing agent and cleaning agent from the fiber surface.

10. The multi-channel continuous degumming method according to claim 9, characterized in that, In the cleaning step, the cleaning tank does not use ultrasound, the treatment temperature is 40-60℃, and the treatment time is 1-5 minutes. And / or, in the water washing step, deionized water at 40-60℃ is used for countercurrent water washing, and the treatment time is 1-5 minutes; And / or, in the low-temperature heat treatment step, the treatment temperature is 250-350℃, the treatment time is 5-10 minutes, and the generated waste gas is continuously extracted and subjected to condensation, adsorption and spray treatment. And / or, in the cleaning step, water washing step and low temperature heat treatment step, the fibers are guided by a rotatable smooth rod to reduce fiber damage.

11. The multi-channel continuous adhesive removal method according to claim 9, characterized in that, The fiber to be treated is carbon fiber, which is then subjected to a series of steps including cleaning, washing, and low-temperature heat treatment to improve the interfacial bonding strength between the carbon fiber and the metal or resin.

12. The multi-channel continuous adhesive removal method according to claim 9, characterized in that, The method is applicable to surface treatment before fibers are composited with metals, resins, ceramics, or bio-based materials, wherein: The metal includes at least one of copper, nickel, aluminum, zinc, silver, gold, or tin; And / or, the resin includes at least one of epoxy resin, dicyclopentadiene resin, phenolic resin, nylon, polyetheretherketone or polyphenylene sulfide; And / or, the fiber includes at least one of carbon fiber, metal fiber, polyester, acrylic fiber, nylon, polypropylene, aramid, ultra-high molecular weight polyethylene fiber, PBO fiber, PBI fiber, M5 fiber, and PI fiber.

13. The multi-channel continuous adhesive removal method according to claim 9, characterized in that, The cleaning agent used in the cleaning step is a water-soluble organic solvent or an inorganic solvent. The organic solvent removes the sizing agent from the fiber surface mainly by physical dissolution, while the inorganic solvent removes the sizing agent from the fiber surface mainly by chemical reaction.

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