A vertical loose spread type continuous fiber prepreg yarn preparation device and method

Abstract

The application provides a vertical loose spreading type continuous fiber pre-impregnated wire preparation device and method, which comprises an impregnation module and a wire collecting module, the wire collecting module is provided with a die orifice, and the wire collecting module is fixed to the output end of the impregnation module; the input end of the impregnation module is provided with an input channel, the input channel is connected with an impregnation cavity, the impregnation cavity is vertically arranged in the impregnation module and is communicated with the wire collecting module, and a spreading core for being inserted into the continuous fiber tows is arranged in the impregnation cavity, the spreading core is provided with a spreading part, and the spreading part is in the shape of a circular truncated cone or a circular cone as a whole; a resin channel communicated with the impregnation cavity is arranged on the side wall of the impregnation module, and a heating body is arranged outside the impregnation cavity. The device utilizes the structure of the spreading core and the cooperation between the spreading core and the inner side wall of the impregnation cavity to fully spread the continuous fiber tows, improves the spreading effect of tows with different orders of magnitude, reduces the risk of breaking of high-order tows in the spreading process, and optimizes the structure of the device, facilitating cleaning and maintenance.

Description

Technical Field

[0001] This invention relates to the technical field of continuous fiber reinforced composite materials, and in particular to an apparatus and method for preparing vertically spread continuous fiber preimpregnated filaments. Background Technology

[0002] 3D printing of continuous fiber composites, represented by continuous carbon fiber, offers comprehensive advantages such as lightweight, high strength, high rigidity, corrosion resistance, and high temperature resistance. Currently developed preparation processes for continuous fiber composites can be divided into two categories based on the different states of the fiber and resin during printing. One category involves directly bonding the continuous fiber bundles and resin during the printing process; the other involves pre-impregnating the continuous fiber bundles and resin into a pre-impregnated filament, and then fully bonding the pre-impregnated filament with more resin during the printing process. The latter is equivalent to a secondary, thorough impregnation of the continuous fiber bundles, thus ensuring the quality of the printed product.

[0003] Most existing pre-impregnated filament equipment consists of multiple rollers that continuously wind continuous fiber bundles around them and pull them along the fiber direction to achieve a spreading effect. Simultaneously, molten thermoplastic resin is combined with the carbon fiber bundle, and after cooling and winding, the pre-impregnated filament is obtained. However, this spreading method restricts the fiber bundle's spread along the roller's axial direction. The pulling force is related to the number of fibers in the bundle; generally, as the number of fibers increases, the tension along the fiber direction is increased to achieve the desired spreading effect. However, with increased tension, some fibers in the bundle are prone to breakage. Furthermore, due to the unidirectional spreading direction, an increased number of fibers results in more areas of the bundle failing to fully bond with the resin, ultimately reducing the impregnation effect.

[0004] In addition, existing pre-impregnated filament equipment typically features a rectangular impregnation tank. To ensure effective impregnation, the tank usually contains excess resin. However, over prolonged use, the excess molten resin accumulates at the bottom of the tank because it cannot be recycled, eventually overflowing. Therefore, cleaning the impregnation tank is necessary during production. However, the multiple rollers in traditional pre-impregnation equipment, designed to ensure proper filament spreading, often obstruct the bottom of the tank, making cleaning difficult. To address this issue, traditional pre-impregnation equipment incorporates many detachable components, a significant portion of which are located in the impregnation area. Furthermore, molten resin frequently accumulates on the mating surfaces between these detachable components and the impregnation tank, further increasing cleaning difficulty and making the process time-consuming and labor-intensive.

[0005] In summary, it is necessary to provide a new method for pre-impregnating filaments to ensure the filament spreading requirements and impregnation effect for filament bundles of different fiber orders, while also providing corresponding pre-impregnating filament equipment with simple construction and easy cleaning characteristics. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, this invention provides a vertically spread continuous fiber preimpregnated filament preparation device and method. By increasing the spreading direction of the continuous fiber bundle through a frustum or cone-shaped spreading section, the external force on the continuous fiber bundle as a whole during the spreading process is reduced, thereby improving the spreading and impregnation effects of filament bundles of different fiber orders and simplifying the structure of the continuous fiber preimpregnated filament preparation device.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A vertically spread continuous fiber preimpregnated filament preparation device includes an impregnation module and a take-up module. The impregnation module has an input end and an output end, and the take-up module is fixed to the output end of the impregnation module. The take-up module has a die opening.

[0009] The impregnation module has an input channel at the input end, which is connected to an impregnation chamber. The impregnation chamber is vertically arranged inside the impregnation module and communicates with the take-up module. A filament-spreading core for inserting into the continuous fiber bundle is installed inside the impregnation chamber. The filament-spreading core has filament-spreading parts at both ends, and the filament-spreading parts have a conical boss structure as a whole.

[0010] The impregnation module has a resin channel on its side wall that communicates with the impregnation cavity, and a heating element is installed on the outside of the impregnation cavity.

[0011] Preferably, near the input end, the filament-spreading section forms a primary filament-spreading zone.

[0012] Preferably, the take-up module is provided with a take-up cavity that communicates with the impregnation cavity.

[0013] Preferably, the take-up cavity includes a gathering section and an extrusion section. The diameter of the gathering section gradually decreases from the side closest to the impregnation cavity until it connects with the extrusion section, and the extrusion section communicates with the die opening.

[0014] Preferably, the impregnation chamber has an impregnation section at the output end that is adapted to the filament spreading section.

[0015] Preferably, near the output end, the sidewall of the filament-spreading section and the sidewall of the impregnation section form a secondary filament-spreading zone.

[0016] Preferably, the impregnation module includes impregnation units, and the impregnation module is formed by combining the impregnation units.

[0017] Preferably, the resin channel is located near the input end of the impregnation module.

[0018] Preferably, the heating element extends through the impregnation module.

[0019] The present invention also provides a method for preparing continuous fiber preimpregnated filaments, based on any of the above-described vertically spread continuous fiber preimpregnated filament preparation apparatuses, comprising the following steps:

[0020] S1. Locate the target area on the continuous fiber bundle that needs to be inserted into the spreading core. Squeeze from both ends of the target area toward the middle, causing the continuous fiber bundle to disperse and bend at the target area and form a spherical space. Insert the spreading core into the spherical space in a direction parallel to the fibers. Pull the continuous fiber bundle along the direction where both ends of the target area are located, causing the fibers of the continuous fiber bundle to stretch, the spherical space to shrink, and the fibers to wrap around the outside of the spreading core, ultimately causing the spreading core to be locked in the target area of ​​the continuous fiber bundle.

[0021] S2. Place the continuous fiber bundle with the fixed spreading core in the impregnation module, wherein the spreading core is located in the impregnation chamber, and the portions of the continuous fiber bundle at both ends of the spreading core are fixed to the input channel and the take-up module, respectively.

[0022] S3. Pass the resin filament through the resin channel. The resin melts under the heating of the heating element and flows into the impregnation chamber.

[0023] S4. When the amount of molten resin in the impregnation chamber meets the impregnation requirements, the continuous fiber bundle is driven to move from the input end of the impregnation module to the die opening of the take-up module, and the continuous fiber bundle is continuously spread, impregnated and taken up to finally obtain the continuous fiber pre-impregnated filament.

[0024] Based on the above technical solution, the technical effects achieved by the present invention are as follows:

[0025] (1) Improve the spreading and impregnation effects of filament bundles of different orders of magnitude. In the vertically spread continuous fiber pre-impregnated filament preparation device provided by the present invention, the spreading core uses the gradually decreasing cross-sectional diameter of the spreading part and the curved surface of its sidewall to spread the continuous fiber bundle, so that the fibers in the continuous fiber bundle are fully spread along different directions of the spreading part, reducing the overall tension required for spreading the continuous fiber bundle, reducing the risk of the continuous fiber bundle breaking due to excessive tension, and improving the spreading effect; and increasing the contact area between the fiber and the resin after spreading, ensuring the impregnation effect of filament bundles of different orders of magnitude.

[0026] (2) Improve the overall quality of continuous fiber prepreg filaments. Traditional methods use multiple rollers to spread the continuous fiber bundles, increasing the contact points between the fibers and the rollers. During the spreading process, the fibers are at risk of being damaged by friction with the rollers. This invention achieves the spreading effect by setting a spreading core, reducing the friction of the fibers in the continuous fiber bundles, reducing the degree of damage, and improving the quality of the final continuous fiber prepreg filaments.

[0027] (3) Reuse of resin reduces resin consumption and enables secondary fiber spreading. The present invention enables the continuous fiber bundle to be spread twice between the side wall of the spreading part and the side wall of the impregnation part through the cooperation of the take-up module and the impregnation chamber, and to be fully impregnated; after impregnation, the continuous fiber bundle is squeezed by the take-up chamber, so that the excess resin flows back into the impregnation chamber, thereby realizing the reuse of resin and reducing resin consumption.

[0028] (4) Simplified structure, easy to disassemble and maintain. The present invention uses impregnation units connected and combined to form an impregnation module, which has a simple structure and is easy to disassemble and assemble. At the same time, after the resin filaments melt, they accumulate at the bottom of the impregnation chamber under the action of gravity. Therefore, the amount of molten resin accumulation can be controlled by controlling the resin filament feeding speed, avoiding resin overflow and reducing the number of maintenance and cleaning times. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the vertically spread continuous fiber preimpregnated filament preparation device of the present invention.

[0030] Figure 2 This is a schematic diagram of the impregnation unit and the filament core of the present invention.

[0031] Figure 3 This is a partially enlarged schematic diagram of the take-up gate module and the impregnation module of the present invention.

[0032] Figure 4 This is a schematic flowchart of the method for preparing vertically spread continuous fiber preimpregnated filaments according to the present invention.

[0033] Figure 5 This is a schematic diagram of the combination of continuous fiber bundle and developing core of the present invention.

[0034] Figure label:

[0035] 1 Impregnation module, 101 Input terminal, 102 Output terminal, 11 Input channel, 12 Impregnation chamber, 13 Spreading core, 131 Spreading core body, 132 Spreading section, 121 Impregnation section, 14 Resin channel, 15 Heating element, 16 Primary spreading area, 17 Secondary spreading area, 18 Impregnation unit;

[0036] 2 take-up module, 21 take-up cavity, 211 gathering part, 212 extrusion part, 22 die opening;

[0037] 3. Continuous fiber bundles. Detailed Implementation

[0038] To facilitate understanding of the present invention, a more comprehensive description will be given below in conjunction with the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0043] Example 1

[0044] Figure 1 A schematic diagram of the vertically spread continuous fiber preimpregnated filament preparation apparatus of the present invention is provided. Figure 2 A structural schematic diagram of the impregnation unit and the filament developing core is provided. (Refer to reference.) Figure 1 and Figure 2This invention provides a vertically spread continuous fiber pre-impregnated filament preparation device, comprising an impregnation module 1 and a take-up module 2, wherein the impregnation module 1 is formed by symmetrical impregnation units 18 through a locking assembly. The take-up module 2 is fixed at the output end 102 of the impregnation module 1. The take-up module 2 is provided with a die 22. After the continuous fiber filament to be impregnated is spread and impregnated by the impregnation module 1, the take-up module 2 takes it up, forming a continuous fiber pre-impregnated filament from the die 22.

[0045] Specifically, the input end 101 of the impregnation module 1 is provided with an input channel 11 that communicates with the outside. The input channel 11 is connected to the impregnation chamber 12, which is connected to the take-up module 2. The impregnation chamber 12 is provided with a yarn spreading core 13. In this embodiment, the yarn spreading core 13 is provided with a cylindrical yarn spreading core body 131 and a yarn spreading part 132 with an overall structure that is approximately conical. The yarn spreading core body 131 and the yarn spreading part 132 are integrally formed. The diameter of the yarn spreading core 13 gradually decreases in the direction of the yarn spreading part 132, and it has curved sidewalls. When in use, the impregnation module 1 is placed vertically, with the input end 101 at the top and the output end 102 at the bottom. Under the action of gravity, the yarn spreading core 13 is located at the bottom of the impregnation chamber 12. The bottom of the impregnation chamber 12 is provided with an impregnation part 121 that is adapted to the yarn spreading part 132. The impregnation part 121 is approximately conical in shape. The impregnation chamber 12 is connected to a resin channel 14 near the input end 101. The resin channel 14 is connected to the outside to facilitate the insertion of resin filaments. Meanwhile, multiple heating elements 15 are evenly distributed on the outside of the impregnation chamber 12 in the impregnation module 1. The heating elements 15 penetrate the impregnation module 1 vertically to uniformly heat the impregnation chamber 12. After passing through the resin channel 14, the resin filaments become molten under the action of the heating elements 15 and accumulate in the impregnation section 121 due to gravity, thus achieving thorough impregnation and bonding with the continuous fiber bundle after spreading.

[0046] In use, one end of the continuous fiber bundle to be impregnated passes through the input channel 11, and the other end passes through the take-up module 2 located at the output end 102. The spreading core 13 is inserted into the continuous fiber bundle. Since the diameter of the spreading core 13 is much larger than that of the continuous fiber bundle, the fibers in the continuous fiber bundle are dispersed and cover the sidewalls of the spreading core 13 under its action. As the continuous fiber bundle moves along the direction from the input end 101 to the output end 102, the spreading core 13 moves upward relative to the continuous fiber bundle. Near the input end 101, the spreading core 13 uses the spreading section 132 to disperse the fibers in the continuous fiber bundle, causing the originally tangled fibers to disperse and spread out along the direction of the generatrix of the spreading section 132, completing one spreading of the continuous fiber bundle. Therefore, the spreading section 132 near the input end 101 forms a primary spreading zone 16. Compared with the method of spreading fibers by rollers, the approximately conical spreading section 132 can increase the direction of continuous fiber bundle spreading, thereby spreading the fibers more thoroughly and helping to ensure the impregnation effect of subsequent continuous fiber bundles.

[0047] Furthermore, as the continuous fiber bundle moves, the fibers after the first spreading move to the impregnation section 121. The impregnation section 121 is adapted to the spreading section 132 near the output end 102, so the fitting gap between the inner sidewall of the impregnation section 121 and the outer sidewall of the spreading section 132 is small. As the fitting gap decreases, the fibers after the first spreading are further dispersed, completing the second spreading. Therefore, a secondary spreading zone 17 is formed between the sidewall of the spreading section 132 near the output end 102 and the sidewall of the impregnation section 121, further optimizing the spreading effect of the continuous fiber bundle. At the same time, the continuous fiber bundle undergoing the second spreading is fully impregnated and bonded with the molten resin in the secondary spreading zone 17, completing the impregnation process. Then, it moves to the die 22 of the take-up module 2 for take-up, and finally forms a pre-impregnated filament.

[0048] In summary, this embodiment mainly utilizes the structure of the spreading core 13 and the cooperation between the spreading core 13 and the sidewall of the impregnation part 121 to complete the spreading of continuous fiber bundles. Unlike spreading by multiple rollers, the spreading method of this embodiment allows the fibers to be fully spread in different directions, ensuring the spreading effect of bundles of different orders of magnitude. At the same time, it reduces the overall tension required when spreading continuous fiber bundles, significantly reducing the risk of breakage of high-order continuous fiber bundles due to the large tension required for spreading.

[0049] In addition, this embodiment achieves the fiber spreading effect by setting a fiber spreading core 13, which reduces the friction of fibers in the continuous fiber bundle, reduces the degree of damage, and improves the quality of the final continuous fiber pre-impregnated filament.

[0050] Example 2

[0051] This embodiment is a further supplement to Embodiment 1. Figure 3A partially enlarged schematic diagram of the take-up module 2 and the impregnation module 1 is provided. (Refer to reference...) Figures 1 to 3 The take-up module 2 is provided with a take-up cavity 21 that connects the die opening 22 and the impregnation cavity 12. The take-up cavity 21 is provided with two parts: a gathering part 211 and a squeezing part 212.

[0052] Specifically, the gathering portion 211 is connected to the impregnation portion 121 of the impregnation cavity 12, and the gathering portion 211 has an overall funnel-shaped structure. The aperture of the gathering portion 211 gradually decreases from the side closest to the impregnation cavity 12 until it connects with the extrusion portion 212. The extrusion portion 212 is a cylindrical through hole of uniform diameter, with a die opening 22 at its end. The aperture of the extrusion portion 212 is the same as the minimum aperture of the gathering portion 211.

[0053] In use, the continuous fiber bundle undergoes secondary spreading in the secondary spreading zone 17 and is fully impregnated with molten resin. After impregnation, the continuous fiber bundle moves to the take-up chamber 21 for take-up. During take-up, as the aperture of the gathering section 211 gradually decreases, the originally dispersed fibers gradually gather together. When the continuous fiber bundle moves to the extrusion section 212, due to the smallest aperture here, the continuous fiber bundle is compressed and further gathered. At the same time, excess resin on the continuous fiber bundle is filtered out by the pressure of the sidewall of the extrusion section 212 and remains in the gathering section 211 or the impregnation chamber 12, thereby reducing resin loss, improving resin utilization, and realizing resin reuse. The fully impregnated continuous fiber bundle is taken up through the take-up chamber 21 and moves to the die 22, finally being gathered into a pre-impregnated filament.

[0054] It should be noted that at the impregnation section 121, there is a distance between the end of the spreading section 132 and the take-up module 2, forming a buffer space. When excess resin on the continuous fiber bundle flows back to the impregnation section 121 due to compression during the take-up process, the buffer space can prevent the spreading core 13 from moving upwards from its original position due to the sudden accumulation of backflowing resin, thereby ensuring the stability of the spreading core 13's position during operation and ensuring the quality of the pre-impregnated filament. In addition, when the aperture of the extrusion section 212 is small enough, the take-up module 2 not only achieves the take-up effect but also acts as a baffle for the impregnation chamber 12, preventing resin from flowing out and thus ensuring that the resin is not wasted.

[0055] It should be noted that the heating element 15 is detachably installed in the impregnation unit 18. When the continuous fiber preimpregnated filament preparation device stops working, the heating element 15 is pulled out from the impregnation module 1, the take-up module 2 and the impregnation module 1 are separated, and the impregnation module 1 is disassembled into two impregnation units 18. The spreading core 13 located in the impregnation chamber 12 is removed and cleaned, and the impregnation chamber 12 of the impregnation unit 18 is also cleaned. Because this continuous fiber preimpregnated filament preparation device has a simple structure, few parts, and is detachable, it is easy to clean and reduces maintenance costs.

[0056] Of course, this is not a limitation on the combination structure of the impregnation module 1 and the take-up module 2. In some embodiments, the impregnation module 1 and the take-up module 2 can be integrated. In other embodiments, the number or connection method of the impregnation units 18 may differ from that of this embodiment. That is, the installation method of the impregnation module 1 can be changed accordingly, provided that it facilitates the installation of the yarn core 13 and the production of pre-impregnated yarn.

[0057] Example 3

[0058] Figure 4 A schematic flowchart of a method for preparing continuous fiber preimpregnated filaments provided in this embodiment is given. Figure 5 A schematic diagram of the combination of continuous fiber bundle and spreading core 13 is given, in conjunction with reference. Figures 1 to 5 The preparation method is based on a vertically spread continuous fiber preimpregnated filament preparation apparatus as described in Example 2, and includes the following steps:

[0059] First, the spreading core 13 needs to be fixed to the continuous fiber bundle 3 to be impregnated. Locate the target area on the continuous fiber bundle 3 where the spreading core 13 needs to be inserted. Squeeze the target area from both ends towards the center, causing the continuous fiber bundle 3 to disperse and bend at the target area, forming a spherical space. Insert the spreading core 13 into this spherical space. It should be noted that during insertion, the central axis of the spreading core 13 should be parallel to the fiber direction, that is, the direction of the line connecting the two spreading sections 132 should be parallel to the fiber direction, allowing the fibers to better disperse along the generatrix of the spreading section 132. After the initial insertion of the spreading core 13, pull the continuous fiber bundle 3 along the directions of both ends of the target area, stretching the fibers of the continuous fiber bundle 3, reducing the spherical space, and wrapping the fibers around the outside of the spreading core 13, thus locking the spreading core 13 into the target area of ​​the continuous fiber bundle 3.

[0060] Next, the continuous fiber bundle 3 with the fixed spreading core 13 is placed in the impregnation module 1, wherein part of the spreading core 13 is placed in the impregnation cavity 12, and the portions of the continuous fiber bundle 3 at both ends of the spreading core 13 are fixed in the input channel 11 and the die opening 22 of the take-up module 2, respectively.

[0061] Next, the resin to be impregnated needs to be prepared. The resin filament is passed through the resin channel 14. The resin filament melts under the heating of the heating body 15 and flows into the impregnation chamber 12, eventually accumulating at the impregnation part 121.

[0062] When the amount of molten resin in the impregnation section 121 meets the impregnation requirements, the melting speed of the resin filament is controlled, and the continuous fiber bundle 3 is driven to move along the direction from the input end 101 to the output end 102, continuously spreading, impregnating and winding the continuous fiber bundle, and finally obtaining the continuous fiber pre-impregnated filament.

[0063] In the above process, the continuous fiber bundle to be impregnated passes through the primary spreading zone 16 and the secondary spreading zone 17 in sequence, achieving full spreading and impregnation. Simultaneously, since the continuous fiber pre-impregnated filament preparation device is in a vertical position, molten resin continuously accumulates in the impregnation chamber 12 located at the bottom. Combined with the take-up module 2, this effectively improves resin utilization while ensuring sufficient resin to impregnate and bond with the fibers.

[0064] In particular, the resin channel 14 is close to the input end 101. During use, by controlling the feeding speed of the resin filament, overflow due to excessive accumulation of molten resin can be avoided, thereby reducing resin loss and saving manpower spent on monitoring and cleaning overflowing resin.

[0065] The above description is merely an example and illustration of the structure of this invention, and while the description is specific and detailed, it should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these obvious substitutions all fall within the protection scope of this invention.

Claims

1. A vertically spread, continuous fiber preimpregnated filament preparation apparatus, characterized in that, It includes an impregnation module (1) and a yarn take-up module (2); The impregnation module (1) is provided with an input end (101) and an output end (102). The take-up module (2) is fixed to the output end (102) of the impregnation module (1). The take-up module (2) is provided with a die opening (22). The impregnation module (1) has an input channel (11) at the input end (101), the input channel (11) is connected to an impregnation chamber (12), the impregnation chamber (12) is vertically arranged in the impregnation module (1) and communicates with the take-up module (2), and a spreading core (13) for inserting into the continuous fiber bundle (3) is installed in the impregnation chamber (12), the spreading core (13) has spreading parts (132) at both ends, and the spreading parts (132) have a conical boss structure as a whole; The impregnation module (1) has a resin channel (14) on its side wall that communicates with the impregnation cavity (12), and a heating element (15) is installed on the outside of the impregnation cavity (12). One end of the continuous fiber bundle to be impregnated passes through the input channel (11), and the other end passes through the take-up module (2) located at the output end (102). The spreading core (13) is inserted into the continuous fiber bundle. Under the action of gravity, the spreading core (13) is located at the bottom of the impregnation chamber (12). The fibers in the continuous fiber bundle are dispersed and covered on the side wall of the spreading core (13) under the action of the spreading core (13). The spreading core (13) uses the spreading part (132) to disperse the fibers in the continuous fiber bundle, so that the fibers that were originally tangled together are dispersed and spread out along the direction of the generatrix of the spreading part (132), thus completing one spreading of the continuous fiber bundle. The impregnation chamber (12) has an impregnation part (121) at the output end (102) that is adapted to the filament spreading part (132); near the output end (102), the side wall of the filament spreading part (132) and the side wall of the impregnation part (121) form a secondary filament spreading area (17). The impregnation module (1) includes impregnation units (18), and the impregnation module (1) is formed by combining the impregnation units (18).

2. The vertically spread continuous fiber preimpregnated filament preparation apparatus according to claim 1, characterized in that, Near the input end (101), the filament-spreading section (132) forms a primary filament-spreading area (16).

3. The vertically spread continuous fiber preimpregnated filament preparation apparatus according to claim 1, characterized in that, The take-up module (2) is provided with a take-up cavity (21) that communicates with the impregnation cavity (12).

4. The vertically spread continuous fiber preimpregnated filament preparation apparatus according to claim 3, characterized in that, The take-up cavity (21) includes a gathering part (211) and an extrusion part (212). The aperture of the gathering part (211) gradually decreases from the side close to the impregnation cavity (12) until it is connected to the extrusion part (212). The extrusion part (212) is connected to the die opening (22).

5. The vertically spread continuous fiber preimpregnated filament preparation apparatus according to claim 1, characterized in that, The resin channel (14) is located near the input end (101) of the impregnation module (1).

6. The vertically spread continuous fiber preimpregnated filament preparation apparatus according to claim 1, characterized in that, The heating element (15) penetrates the impregnation module (1).

7. A method for preparing continuous fiber preimpregnated filament, characterized in that, The apparatus for preparing vertically spread continuous fiber preimpregnated filaments according to any one of claims 1-6 includes the following steps: S1. Locate the target area on the continuous fiber bundle (3) into which the spreading core (13) needs to be inserted. Squeeze from both ends of the target area toward the middle, so that the continuous fiber bundle (3) is dispersed and bent at the target area and forms a spherical space. The spreading core (13) is inserted into the spherical space in a direction parallel to the fiber. Pull the continuous fiber bundle (3) along the direction where both ends of the target area are located, so that the fibers of the continuous fiber bundle (3) are stretched, the spherical space is reduced, and the fibers are wrapped around the outside of the spreading core (13), so that the spreading core (13) is finally locked in the target area of ​​the continuous fiber bundle (3). S2. Place the continuous fiber bundle (3) with the fixed spreading core (13) in the impregnation module (1), wherein part of the spreading core (13) is located in the impregnation chamber (12), and the parts of the continuous fiber bundle (3) at both ends of the spreading core (13) are fixed in the input channel (11) and the take-up module (2) respectively. S3. Pass the resin filament through the resin channel (14), and the resin melts under the heating of the heating element and flows into the impregnation chamber (12). S4. When the amount of molten resin in the impregnation chamber (12) meets the impregnation requirements, drive the continuous fiber bundle (3) from the input end (101) of the impregnation module (1) to the die opening (22) of the take-up module (2) to continuously spread, impregnate and take up the continuous fiber bundle (3) to finally obtain the continuous fiber pre-impregnated filament.

Images