An impregnation device for a prepreg resin and a method of using the same

Abstract

This invention discloses an impregnation device for prepreg resin and its method of use, relating to the field of resin impregnation technology. The device comprises, in sequence according to the direction of fiber cloth feeding, a front traction roller, an impregnation tank, an extrusion roller, a pre-curing oven, and a rear traction roller. The impregnation tank contains a resin solution and a guide roller is disposed within it. The extrusion roller is positioned above the impregnation tank and behind the guide roller, and its edge is equipped with a fixed scraper along its axial direction for scraping off excess resin from the upper surface of the fiber cloth. This invention fundamentally solves the problems of uneven resin distribution along the thickness direction of the fiber cloth, insufficient resin at the edges and bottom, and the inability to expel closed-cell microbubbles in existing processes, significantly improving the interlayer bonding strength and overall density of the prepreg.

Description

Technical Field

[0001] This invention relates to the field of resin impregnation technology, and more specifically to an impregnation apparatus for prepreg resin and its method of use. Background Technology

[0002] In existing prepreg preparation technologies, solution impregnation is a common process. Figure 1 The diagram illustrates an impregnation process, specifically including: a fabric storage system continuously releases fiber fabric, which, after its tension and speed are controlled by a front traction roller, enters an impregnation tank; the impregnation tank contains a resin solution, and a guide roller is installed inside the tank; an extrusion roller is positioned above the impregnation tank and behind the guide roller. The fiber fabric first bypasses the guide roller in the impregnation tank, fully absorbs the resin while immersed, and then is drawn upwards and enters the extrusion roller.

[0003] The fiber cloth is then drawn upwards and enters an extrusion roller positioned above the impregnation tank. The extrusion roller has a fixed scraper along its axial direction along its edge to remove excess resin from the surface of the fiber cloth. After passing through the extrusion roller, the fiber cloth enters a pre-curing oven, where heating causes the solvent to evaporate and the resin to undergo a partial cross-linking reaction, transforming it into a semi-solid state, thus setting the shape and facilitating layup operations. The evaporated solvent is recovered or purified by a specialized solvent treatment device. Subsequently, a polyethylene release film is applied to the surface of the prepreg using a PE film application device, and after synchronous traction by a rear traction roller, it is finally wound into a roll by a winding device.

[0004] However, the above process has a series of quality problems in practical applications: First, the resin distribution along the thickness direction of the fiber cloth is severely uneven, with the resin layer on the upper surface of the fiber cloth being thicker and the resin layer on the lower surface being thinner, i.e., a layered distribution with a thicker upper layer and a thinner lower layer. Second, in the edge areas along the width direction, localized glue shortages are prone to occur at the bottom of the fiber cloth. More importantly, the closed-cell microbubbles inside the fiber bundle cannot be effectively expelled, and most of the bubbles remain hidden at the interface between the extrusion roller and the fiber cloth.

[0005] Therefore, how to eliminate the uneven resin distribution in the thickness direction of the fiber cloth (thicker at the top and thinner at the bottom), avoid missing resin at the bottom edge in the width direction, and effectively remove closed microbubbles inside the fiber bundle to improve the bottom layer wetting state has become a technical problem that urgently needs to be solved in this field.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] To address the aforementioned technical problems, embodiments of the present invention provide an impregnation apparatus for prepreg resin and a method for using it, thereby resolving the issues raised in the background section.

[0008] I. In response to the technical problems in the existing solution impregnation method for prepregs, such as the resin thickness being thicker at the top and thinner at the bottom of the fiber cloth, insufficient resin at the edges and bottom of the width, and the retention of closed-cell microbubbles inside the fiber bundles, this solution first conducts an in-depth analysis of their root causes.

[0009] exist Figure 1 In the impregnation process shown, after the fiber cloth is fully impregnated in the impregnation tank, it is drawn upwards and passed through the extrusion roller. The extrusion roller only scrapes and controls the thickness of the upper surface, while the lower surface relies entirely on gravity and fiber capillary action to naturally adsorb the resin. Because the fiber cloth itself is a porous medium, there is a significant flow resistance gradient when the resin penetrates in the vertical thickness direction. The resin preferentially accumulates in the upper fiber layer and is difficult to migrate quickly to the lower layer.

[0010] Meanwhile, during the impregnation process, tiny air bubbles inevitably get trapped between the fiber bundles. These bubbles are pressed into the fabric by the scraper on the upper surface, while the bottom lacks any disturbance or venting mechanism, causing the bubbles to be trapped inside the fiber bundles and form closed pores. In addition, the edge areas in the width direction are prone to bottom glue shortages due to the loose structure of the fiber fabric and the restricted lateral flow of resin.

[0011] Therefore, the root of the above problem lies in: Figure 1 The process only mechanically controls the thickness of the upper surface, while the lower surface lacks both active homogenization and venting channels, preventing the resin from establishing an effective penetration driving force in the thickness direction. Therefore, based on the above problem analysis, the core design concept of this invention is: using bottom dynamic micro-perturbation homogenization as the main technical axis, by adding a resin homogenization unit behind the extrusion roller on the discharge side, and cooperating with tension rollers and guide columns to form a specific fiber cloth guiding path, thus solving the above-mentioned difficulties from the source, as detailed below: (I) The fundamental mechanism of action of the resin homogenization unit The resin homogenizing unit consists of a reciprocating lead screw, a guide post, an internal threaded sleeve, and a homogenizing vertical plate. The free end face of the homogenizing vertical plate is chamfered at the position where it contacts the lower surface of the fiber cloth, and is located on one side of the lower surface of the fiber cloth. When the drive motor drives the reciprocating lead screw to rotate, the internal threaded sleeve makes a precise lateral reciprocating linear motion along the guide post, thereby driving the top chamfered end face of the homogenizing vertical plate to continuously slide laterally along the width direction on the lower surface of the fiber cloth.

[0012] This movement produces a dual physical effect. The first is lateral forced diffusion: the chamfered end faces apply periodic lateral shear force to the resin in the bottom layer of the fiber cloth, which disrupts the static distribution balance of the resin in the porous fiber layer, forcing the resin that originally accumulated on the upper surface and in the middle of the width to migrate laterally to the edge and bottom layer along the gaps between the fiber bundles, thereby actively compensating for the lack of resin at the edge and balancing the resin concentration in the thickness direction.

[0013] Secondly, there is the microbubble mechanical extrusion: the reciprocating chamfered end face forms a dynamic contact pressure with the lower surface of the fiber fabric. This pressure continuously changes along the width of the fiber fabric, causing the microbubbles trapped inside the fiber bundles to be periodically squeezed and released. Under the action of the pressure gradient, the bubbles escape along the longitudinal or transverse channels of the fiber towards the edge or surface of the fabric, and are eventually discharged from the fiber fabric. Compared with simply relying on the negative pressure of the impregnation roller, this active bottom disturbance can effectively remove micron-sized closed-cell bubbles.

[0014] (II) Coordinated design of tension roller, guide column and homogenizing plate like Figure 6 As shown: Guide posts two and three are located on both sides of the homogenizing plate and below it; the tension roller is arranged directly above the homogenizing plate. The fiber cloth is first guided downward by guide post three, then passes horizontally from the top of the homogenizing plate, ensuring its lower surface is in contact with the chamfered end face of the top of the homogenizing plate. It is then guided downward by guide post two, followed by upward extension and around the tension roller, and then continues to be extended along the surface of the tension roller. This guiding path forms a specific horizontal contact and vertical climbing structure, whose key functions are reflected in the following two aspects.

[0015] Firstly, a stable, close contact is established under constant tension. As the fiber cloth passes horizontally through the top of the homogenizing plate, the downward guiding action of guide posts two and three, along with the upward traction of the tension roller, creates a constant normal pressure on the top chamfered end face of the homogenizing plate. This pressure ensures effective contact between the homogenizing plate and the lower surface of the fiber cloth while preventing excessive compression that could damage the fibers. Simultaneously, the stable tension provided by the tension roller keeps the fiber cloth flat in the width direction, preventing wrinkling or misalignment caused by the reciprocating motion of the homogenizing plate.

[0016] Secondly, it extends the resin redistribution time window. After the fiber cloth leaves the homogenizing plate, it needs to be guided downward by the second guide post and then climb upward to bypass the tension roller. This process increases the time for the resin to migrate laterally inside the fiber cloth and for bubbles to rise, thus further consolidating the homogenization effect.

[0017] II. The present invention provides the following technical solution: a prepreg resin impregnation device; which is arranged in sequence according to the direction of fiber cloth guiding: a front traction roller, an impregnation tank, an extrusion roller, a pre-curing oven and a rear traction roller; the impregnation tank is filled with resin solution and a guide roller is arranged in the impregnation tank. The extrusion roller is arranged above the impregnation tank and behind the guide roller. The edge of the extrusion roller is provided with a fixed scraper along its axial direction to scrape off excess resin from the upper surface of the fiber cloth and control the thickness of that side. It also includes: a resin homogenization unit and a tension roller, with the resin homogenization unit located behind the discharge side of the extrusion roller; The resin homogenization unit includes: frame, guide post one, guide sleeve, reciprocating screw, internal threaded sleeve, homogenization plate, drive motor, guide post two, and guide post three; The frame includes two spaced-apart side plates; a guide post is fixed between the two side plates; The reciprocating lead screw is set parallel to the guide column and its two ends are rotatably connected between two side plates; The drive motor is fixed on the outside of the side plate, and the main shaft of the drive motor is connected to one end of the reciprocating screw. The internal threaded sleeve is connected to the reciprocating lead screw thread through its internal thread. The guide sleeve is slidably fitted onto the guide post, and the outer wall of the guide sleeve is fixedly connected to the outer wall of the internal threaded sleeve. The homogenizing plate is perpendicular to the internal thread axis sleeve and fixedly connected to the top side surface of the outer wall of the internal thread sleeve; the free end face of the homogenizing plate is chamfered. Guide post two and guide post three are located on both sides of the homogenization plate and below the homogenization plate; and guide post two and guide post three are respectively fixed between the two side plates and parallel to guide post one; The tension roller is located above the homogenizing plate. The fiber cloth is first guided downward by the third guide post, then passes horizontally from the top of the homogenizing plate while keeping its lower surface in contact with the top of the homogenizing plate, then guided downward by the second guide post, then led upward and around the tension roller, and then continued to be led out along the surface of the tension roller.

[0018] Preferably, it also includes a flattening unit, which is located on the discharge side of the tension roller and is positioned close to the tension roller; The flattening unit includes a flattening roller and a power adjustment unit for adjusting the gap between the flattening roller and the tension roller.

[0019] Preferably, the power adjustment unit includes two sets, and each set of adjustment units is located on the inner side of the side plate at the same position; The adjustment unit includes: connecting arm, lower bushing, upper bushing, cylinder, L-shaped fixing plate, bolt, nut one and nut two; The upper and lower ends of the connecting arm are rotatably connected to an upper bushing and a lower bushing, respectively; the lower bushing is rotatably connected to a short shaft fixed to the inside of the side plate; the roller shaft of the flattening roller is rotatably connected to two upper bushings on both sides. The bottom of the cylinder body is rotatably connected to the inside of the side plate; the cylinder drive rod is hinged to one side of the connecting arm. The L-shaped fixing plate is fixed to the inside of the side plate; one end of the bolt is fixed to the connecting arm; the other end of the bolt passes through the L-shaped fixing plate, and nuts one and two are locked on the bolt on both sides of the L-shaped fixing plate respectively.

[0020] Preferably, it also includes a leveling unit; the leveling unit includes a leveling blade, an optical axis, a fixed block, and a movable block; The optical axis is fixed between the two side plates and located below the flattening roller; The leveling blade is fixed to the bottom surface of the fixed block; Grooves are provided between the fixed block and the movable block; the optical axis is fixed in the groove between the fixed block and the movable block; the fixed block and the movable block are connected and locked by screws.

[0021] The method of using the prepreg resin impregnation apparatus described above includes the following steps: Step 1: After the fiber cloth is drawn out and its tension and conveying speed are controlled by the front traction roller, it enters the impregnation tank; Step 2: The fiber cloth passes around the guide rollers set in the impregnation tank and absorbs the resin solution while immersed; Step 3: The fiber cloth is drawn upward and enters the extrusion roller arranged above the impregnation tank. The excess resin on the upper surface of the fiber cloth is scraped off and the thickness on that side is controlled by the fixed scraper set along the axial direction of the extrusion roller. Step 4: After the fiber cloth leaves the extrusion roller, it enters the resin homogenization unit area, ensuring that the lower surface of the fiber cloth passes over the top surface of the homogenization plate, continues to be drawn upwards, passes over the tension roller, and is drawn out from the surface of the tension roller. Step 5: Drive the reciprocating screw to rotate, causing the internal threaded sleeve to reciprocate linearly along the guide post, thereby causing the top surface of the homogenizing plate to reciprocate laterally along the width direction on the lower surface of the fiber cloth. Step Six: The fiber cloth drawn from the surface of the tension roller enters the pre-curing oven, where heating causes the solvent to evaporate and the resin to undergo a partial cross-linking reaction, transforming it into a semi-solid state; Step 7: The evaporated solvent is recovered or purified by the solvent treatment device, the prepreg is covered with a polyethylene release film by the PE film release device, and finally pulled by the rear traction roller and wound into a roll by the winding device.

[0022] The impregnation apparatus and method for prepreg resin provided in this invention have the following beneficial effects: First, a resin homogenizing unit is installed behind the extrusion roller on the discharge side, and a homogenizing plate that can reciprocate along the width direction is disposed on the lower surface of the fiber cloth. The chamfered end face of the homogenizing plate applies a periodic transverse shear force to the resin in the bottom layer of the fiber cloth, which can effectively disrupt the static distribution balance of the resin in the porous fiber layer, forcing the resin that originally accumulated on the upper surface and in the middle of the width to migrate laterally to the edge and bottom layer along the fiber bundle gaps, thereby actively compensating for the lack of resin at the edge and bottom in the width direction and significantly improving the problem of the resin distribution being thicker at the top and thinner at the bottom in the thickness direction of the fiber cloth. At the same time, the dynamic contact pressure formed between the reciprocating chamfered end face and the lower surface of the fiber cloth causes the microbubbles sealed inside the fiber bundles to be periodically squeezed and released. Under the action of the pressure gradient, the bubbles escape from the fiber cloth along the longitudinal or transverse channels of the fibers. Compared with the limitation of simply relying on the negative pressure of the impregnation roller to remove only large bubbles, this invention can effectively remove micron-sized closed-pore bubbles and fundamentally improve the bottom layer impregnation state.

[0023] Second, the tension roller is positioned directly above the homogenizing plate, forming a specific fiber cloth guiding path with guide posts two and three. The fiber cloth is first guided downwards by guide post three, then passes horizontally from the top of the homogenizing plate while maintaining contact between its lower surface and the top of the plate. It is then guided downwards again by guide post two, followed by upward movement and around the tension roller. In this path, the upward pull of the tension roller creates a constant normal pressure on the chamfered end face of the homogenizing plate, ensuring effective contact while avoiding excessive compression that could damage the fibers. This also prevents wrinkling or misalignment caused by the reciprocating motion of the homogenizing plate. Furthermore, after leaving the homogenizing plate, the fiber cloth is guided downwards by guide post two and then upwards again, bypassing the tension roller. This process increases the time window for lateral resin migration and bubble rising within the fiber cloth, further consolidating the homogenization effect.

[0024] Third, this invention includes a flattening unit on the discharge side of the tension roller. This unit briefly controls the movement of the flattening roller via a cylinder to adjust the gap between it and the tension roller. After the gap is adjusted, compressed air is released, and the two nuts on the locking bolt form a rigid limit, thus precisely maintaining the set spacing. This design ensures that the fiber cloth is subjected to uniform and controllable radial pressure as it passes through, further smoothing the resin layer thickness and compacting the internal structure. Below the flattening unit, a leveling unit is also provided. The leveling blade is stably installed by clamping the optical shaft with a fixed block and a movable block, scraping and repairing any minor protrusions or wrinkles that may appear on the surface of the fiber cloth, ensuring the flatness of the prepreg surface. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the impregnation process of the prepreg resin in this invention; Figure 2 This is a structural schematic diagram of the resin homogenization unit and other structural elements in this invention from one angle. Figure 3This is a schematic diagram of the structure of the resin homogenization unit and other structures in this invention from another angle. Figure 4 This is a structural diagram of the resin homogenization unit and other structures in this invention from angle three. Figure 5 For the present invention Figure 4 Cross-sectional view along the AA direction; Figure 6 For the present invention Figure 5 A magnified view of part B in the image; Figure 7 This is a schematic diagram of the material guiding path of the fiber cloth on the resin homogenization unit in this invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] See Figures 1-7 To address the problems mentioned in the background section, this invention provides an impregnation apparatus for prepreg resin and a method for using it, thereby solving the aforementioned technical problems. The technical solution is as follows: An impregnation device for prepreg resin; which is arranged in sequence according to the direction of fiber cloth 200: a front traction roller, an impregnation tank, an extrusion roller, a pre-curing oven and a rear traction roller; the impregnation tank is filled with resin solution and a guide roller is provided in the impregnation tank; The extrusion roller is arranged above the impregnation tank and behind the guide roller. The edge of the extrusion roller is provided with a fixed scraper along its axial direction to scrape off excess resin from the upper surface of the fiber cloth 200 and control the thickness of that side. It also includes: a resin homogenization unit and a tension roller 130, wherein the resin homogenization unit is located behind the discharge side of the extrusion roller; The resin homogenization unit includes: a frame, a guide post 121, a guide sleeve 122, a reciprocating lead screw 123, an internal threaded sleeve 124, a homogenization plate 125, a drive motor 127, a guide post 2 126, and a guide post 3 128. The frame includes two spaced-apart side plates 110; a guide post 121 is fixed between the two side plates 110. The reciprocating lead screw 123 is arranged parallel to the guide post 121 and its two ends are rotatably connected between the two side plates 110; The drive motor 127 is fixed on the outside of the side plate 110, and the main shaft of the drive motor 127 is driven connected to one end of the reciprocating screw 123. The internal threaded sleeve 124 is threadedly connected to the reciprocating lead screw 123 through its internal thread; The guide sleeve 122 is slidably sleeved on the guide post 121, and the outer wall of the guide sleeve 122 is fixedly connected to the outer wall of the internal thread sleeve 124. The homogenizing plate 125 is perpendicular to the internal threaded sleeve 124 and is fixedly connected to the top side surface of the outer wall of the internal threaded sleeve 124; the free end face of the homogenizing plate 125 is chamfered at the position where it contacts the lower surface of the fiber cloth. Guide post 2 126 and guide post 3 128 are respectively located on both sides of the homogenization plate 125 and below the homogenization plate 125; and guide post 2 126 and guide post 3 128 are respectively fixed between the two side plates 110 and parallel to guide post 1 121. The tension roller 130 is located above the homogenizing plate 125. The fiber cloth is first guided downward by the guide post 3 128, then passes horizontally from the top of the homogenizing plate 125 and keeps its lower surface in contact with the top of the homogenizing plate 125, then guided downward by the guide post 2 126, then led upward and around the tension roller 130, and then continued to be led out along the surface of the tension roller 130.

[0028] In this embodiment, a flattening unit is also included. The flattening unit is located on the discharge side of the tension roller 130 and is set close to the tension roller 130. The flattening unit includes a flattening roller 140 and a power adjustment unit for adjusting the gap between the flattening roller 140 and the tension roller 130.

[0029] In this embodiment, the power adjustment unit includes two sets, and each set of adjustment units is located inside the side plate 110 on the same side. The adjustment unit includes: connecting arm 164, lower bushing 161, upper bushing 162, cylinder 165, L-shaped fixing plate 169, bolt 166, nut one 167 and nut two 168; The upper and lower ends of the connecting arm 164 are rotatably connected to the upper bushing 162 and the lower bushing 161, respectively; the lower bushing 161 is rotatably connected to a short shaft 163 fixed inside the side plate 110; the roller shaft 140a of the flattening roller 140 is rotatably connected to the two upper bushings 162 on both sides. The bottom of the cylinder body of cylinder 165 is rotatably connected to the inside of side plate 110; the drive rod of cylinder 165 is hinged to one side of connecting arm 164. The L-shaped fixing plate 169 is fixed to the inside of the side plate 110; one end of the bolt 166 is fixed to the connecting arm 164; the other end of the bolt 166 passes through the L-shaped fixing plate 169, and nuts 167 and 168 are respectively locked on both sides of the L-shaped fixing plate 169.

[0030] It should be noted that in this power adjustment unit, the cylinder drives the connecting arm to swing around the short axis, which is used to briefly control the movement of the flattening roller to adjust the gap between it and the tension roller. After the gap adjustment is completed, the compressed air in the cylinder is released and no longer applies driving force. At this time, the two nuts on the locking bolt make the bolt and the L-shaped fixing plate form a rigid limit, thereby accurately maintaining the set gap between the flattening roller and the tension roller, ensuring that the fiber cloth is subjected to uniform and controllable radial pressure when passing through, so as to flatten the resin layer thickness and compact the internal structure.

[0031] In this embodiment, a leveling unit is also included; the leveling unit includes a leveling blade 150, an optical axis 151, a fixed block 152, and a movable block 153; The optical axis 151 is fixed between the two side plates 110 and located below the flattening roller 140; The leveling blade 150 is fixed to the bottom surface of the fixing block 152; Grooves are provided between the fixed block 152 and the movable block 153; the optical axis 151 is fixed in the groove between the fixed block 152 and the movable block 153; the fixed block 152 and the movable block 153 are connected and locked by screws.

[0032] It should be noted that the leveling unit clamps the optical shaft through the grooves on the fixed block and the movable block, and the leveling knife is stably installed below the flattening roller by screws. The leveling knife is used to scrape and trim the surface of the fiber cloth to eliminate any possible minor bumps or wrinkles and ensure the flatness of the prepreg surface.

[0033] The specific working method of the prepreg resin impregnation device provided in this embodiment is as follows: Step 1: The fiber cloth is continuously released from the cloth storage system, and after the tension and conveying speed are controlled by the front traction roller, it enters the impregnation tank.

[0034] Step 2: The fiber cloth passes around the guide rollers set in the impregnation tank and fully absorbs the resin solution while immersed.

[0035] Step 3: The fiber cloth is drawn upwards and enters the extrusion roller arranged above the impregnation tank. A fixed scraper, positioned along the axial direction of the edge of the extrusion roller, scrapes off excess resin from the upper surface of the fiber cloth and controls the thickness on that side.

[0036] Step 4: After leaving the extrusion roller, the fiber cloth enters the resin homogenization unit area. At this time, the fiber cloth is guided downward by guide posts two and three, ensuring that the lower surface of the fiber cloth passes over the top surface of the homogenization plate, then is led upward and passes over the tension roller, and then is led out from the surface of the tension roller.

[0037] Step 5: Start the drive motor to rotate the reciprocating screw. The reciprocating screw drives the internal threaded sleeve to reciprocate linearly along the guide post, thereby causing the top surface of the homogenizing plate to move continuously laterally along the width direction on the lower surface of the fiber cloth. This movement applies periodic shear force to the resin at the bottom layer of the fiber cloth, forcing the resin to diffuse laterally and expel the closed microbubbles inside the fiber bundles.

[0038] Step Six: The fiber cloth drawn from the tension roller surface enters the flattening unit area. The gap between the flattening roller and the tension roller is precisely controlled by the power adjustment unit, applying uniform radial pressure to the fiber cloth to further flatten the resin layer thickness and compact the internal structure. The power adjustment unit drives the connecting arm to swing via a cylinder, and the minimum gap between the flattening roller and the tension roller is limited by bolts and nuts.

[0039] Step 7: The fiber cloth continues to move downwards into the leveling unit area. The leveling knife is fixed to the bottom of the fixed block, and the fixed block and the movable block are clamped on the optical axis through grooves. The leveling knife scrapes and trims any minor protrusions or wrinkles that may appear on the surface of the fiber cloth to ensure that the surface of the prepreg is flat.

[0040] Step 8: The fiber cloth enters the pre-curing oven, where heating causes the solvent to evaporate and the resin to undergo a partial cross-linking reaction, transforming it into a semi-solid state, thus setting it and facilitating subsequent lay-up operations. The evaporated solvent is recovered or purified by a solvent treatment device.

[0041] Step 9: The prepreg is covered with a polyethylene release film by the PE film feeding device, and finally pulled by the rear traction roller and wound into a roll by the winding device.

[0042] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of components or the interaction between components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solutions and concepts of this invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. An impregnation device for prepreg resin; wherein, arranged sequentially according to the direction of fiber cloth feeding, there are: a front traction roller, an impregnation tank, an extrusion roller, a pre-curing oven and a rear traction roller; the impregnation tank is filled with resin solution and a guide roller is provided in the impregnation tank; in, The extrusion roller is arranged above the impregnation tank and behind the guide roller. The edge of the extrusion roller is provided with a fixed scraper along its axial direction to scrape off excess resin from the upper surface of the fiber cloth and control the thickness of that side. It also includes: a resin homogenization unit and a tension roller, with the resin homogenization unit located behind the discharge side of the extrusion roller; The resin homogenization unit includes: frame, guide post one, guide sleeve, reciprocating screw, internal threaded sleeve, homogenization plate, drive motor, guide post two, and guide post three; The frame includes two spaced-apart side plates; a guide post is fixed between the two side plates; The reciprocating lead screw is set parallel to the guide column and its two ends are rotatably connected between two side plates; The drive motor is fixed on the outside of the side plate, and the main shaft of the drive motor is connected to one end of the reciprocating screw. The internal threaded sleeve is connected to the reciprocating lead screw thread through its internal thread. The guide sleeve is slidably fitted onto the guide post, and the outer wall of the guide sleeve is fixedly connected to the outer wall of the internal threaded sleeve. The homogenizing plate is perpendicular to the internal thread axis sleeve and fixedly connected to the top side surface of the outer wall of the internal thread sleeve; the free end face of the homogenizing plate is chamfered. Guide post two and guide post three are located on both sides of the homogenization plate and below the homogenization plate; and guide post two and guide post three are respectively fixed between the two side plates and parallel to guide post one; The tension roller is located above the homogenizing plate. The fiber cloth is first guided downward by the third guide post, then passes horizontally from the top of the homogenizing plate while keeping its lower surface in contact with the top of the homogenizing plate, then guided downward by the second guide post, then led upward and around the tension roller, and then continued to be led out along the surface of the tension roller.

2. The impregnation apparatus and method for using the prepreg resin according to claim 1, characterized in that, It also includes a flattening unit, which is located on the discharge side of the tension roller and is set close to the tension roller; The flattening unit includes a flattening roller and a power adjustment unit for adjusting the gap between the flattening roller and the tension roller.

3. The impregnation apparatus and method for using the prepreg resin according to claim 2, characterized in that, The power adjustment unit consists of two sets, each set of adjustment units is located on the inside of the side plate on the same side; The adjustment unit includes: connecting arm, lower bushing, upper bushing, cylinder, L-shaped fixing plate, bolt, nut one and nut two; The upper and lower ends of the connecting arm are rotatably connected to an upper bushing and a lower bushing, respectively; the lower bushing is rotatably connected to a short shaft fixed to the inside of the side plate; the roller shaft of the flattening roller is rotatably connected to two upper bushings on both sides. The bottom of the cylinder body is rotatably connected to the inside of the side plate; the cylinder drive rod is hinged to one side of the connecting arm. The L-shaped fixing plate is fixed to the inside of the side plate; one end of the bolt is fixed to the connecting arm; the other end of the bolt passes through the L-shaped fixing plate, and nuts one and two are locked on the bolt on both sides of the L-shaped fixing plate respectively.

4. The impregnation apparatus and method for using the prepreg resin according to claim 2, characterized in that, It also includes a leveling unit; the leveling unit includes a leveling blade, an optical axis, a fixed block, and a movable block; The optical axis is fixed between the two side plates and located below the flattening roller; The leveling blade is fixed to the bottom surface of the fixed block; Grooves are provided between the fixed block and the movable block; the optical axis is fixed in the groove between the fixed block and the movable block; the fixed block and the movable block are connected and locked by screws.

5. The method of using the prepreg resin impregnation apparatus according to claim 1, characterized in that, Includes the following steps: Step 1: After the fiber cloth is drawn out and its tension and conveying speed are controlled by the front traction roller, it enters the impregnation tank; Step 2: The fiber cloth passes around the guide rollers set in the impregnation tank and absorbs the resin solution while immersed; Step 3: The fiber cloth is drawn upward and enters the extrusion roller arranged above the impregnation tank. The excess resin on the upper surface of the fiber cloth is scraped off and the thickness on that side is controlled by the fixed scraper set along the axial direction of the extrusion roller. Step 4: After the fiber cloth leaves the extrusion roller, it enters the resin homogenization unit area, ensuring that the lower surface of the fiber cloth passes over the top surface of the homogenization plate, continues to be drawn upwards, passes over the tension roller, and is drawn out from the surface of the tension roller. Step 5: Drive the reciprocating screw to rotate, causing the internal threaded sleeve to reciprocate linearly along the guide post, thereby causing the top surface of the homogenizing plate to reciprocate laterally along the width direction on the lower surface of the fiber cloth. Step Six: The fiber cloth drawn from the surface of the tension roller enters the pre-curing oven, where heating causes the solvent to evaporate and the resin to undergo a partial cross-linking reaction, transforming it into a semi-solid state; Step 7: The evaporated solvent is recovered or purified by the solvent treatment device, the prepreg is covered with a polyethylene release film by the PE film release device, and finally pulled by the rear traction roller and wound into a roll by the winding device.

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