An impregnation die for continuous fiber thermoplastic resin prepreg tape and method of manufacture

Abstract

The application provides an impregnation mold for a continuous fiber thermoplastic resin prepreg tape and a preparation method thereof, and belongs to the technical field of thermoplastic composite prepreg tape preparation. The application solves the problems of serious fiber damage, accumulation of loose fibers and accumulation of molten resin in the process of preparing a high-viscosity thermoplastic resin prepreg tape in the prior art. The application comprises an upper mold cover plate, a lower mold impregnation tank, upper mold impregnation rollers, lower mold impregnation rollers, a support frame, a traction mechanism and a temperature rising mechanism. The upper mold cover plate is arranged above the lower mold impregnation tank. The upper mold cover plate is uniformly provided with a plurality of upper mold impregnation rollers along the continuous fiber running direction. The heights of the plurality of upper mold impregnation rollers gradually decrease along the continuous fiber running direction. The lower mold impregnation tank is uniformly provided with a plurality of lower mold impregnation rollers along the continuous fiber running direction. After the upper mold cover plate is combined with the lower mold impregnation tank, the upper mold impregnation rollers and the lower mold impregnation rollers are alternately arranged. The application is mainly used for preparing a continuous fiber reinforced high-viscosity thermoplastic resin prepreg tape.

Description

Technical Field

[0001] This invention belongs to the field of thermoplastic composite prepreg preparation technology, and in particular relates to an impregnation mold and preparation method for a continuous fiber thermoplastic resin prepreg. Background Technology

[0002] Continuous fiber reinforced thermoplastic resin composites are a class of composite materials formed by combining lightweight, high-strength continuous fibers such as carbon fiber (CF), glass fiber (GF), and basalt fiber (BF) with thermoplastic resin matrices such as polyetheretherketone (PEEK), polyetherimide (PEI), and polyphenylene sulfide (PPS). These composite materials not only inherit the high strength and high modulus of continuous fibers, but also possess the high temperature resistance, chemical corrosion resistance, and fatigue resistance of thermoplastic resins. They are currently widely used in aerospace, sporting goods, medical devices, electronics and electrical engineering, and construction engineering. Their lightweight and high-strength characteristics give them significant advantages in reducing structural weight and improving energy efficiency.

[0003] There are various preparation processes for continuous fiber reinforced thermoplastic resin composites, including melt impregnation, solution impregnation, powder impregnation, and film lamination. These processes impregnate molten resin into continuous fibers, forming a bond between the two. Therefore, the impregnation effect of the resin and fiber is crucial to the performance of the final composite material. Melt impregnation is widely used due to its advantages such as simple equipment, short preparation cycle, continuous production capability, and high preparation efficiency. However, the high viscosity and poor flowability of thermoplastic resins in the molten state pose challenges to the preparation of prepreg tapes. Solving these technical problems is crucial for improving the performance of thermoplastic prepreg tapes and expanding their use in high-end applications.

[0004] In existing melt impregnation molds, such as those published in Chinese patents CN116100702A, CN111452254A, and CN106903906A, the molds are always in a closed state. During the contact process between the fibers and the impregnation rollers, the fibers are easily damaged or broken, resulting in broken filaments. These broken filaments gradually accumulate, seriously affecting the mechanical properties of the composite material and eventually causing the mold to clog, hindering continuous production. At the same time, because existing molds cannot precisely control the resin content, excessive resin accumulates in the angle area between the continuous fibers and the impregnation rollers, resulting in uneven impregnation of the thermoplastic resin with poor flowability, which cannot guarantee the consistency and stability of product quality. Summary of the Invention

[0005] In view of this, the present invention aims to provide an impregnation mold and preparation method for continuous fiber thermoplastic resin prepreg tape, to solve the problems of severe fiber damage, fuzz accumulation, and molten resin buildup in the existing technology for preparing high-viscosity thermoplastic resin prepreg tape. This significantly improves the surface quality of the prepreg tape and increases pultrusion efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an impregnation mold for a continuous fiber thermoplastic resin prepreg tape, comprising an upper mold cover plate, a lower mold impregnation tank, an upper mold impregnation roller, a lower mold impregnation roller, a support frame, a traction mechanism, and a heating mechanism. The upper mold cover plate covers the upper mold impregnation tank. A plurality of upper mold impregnation rollers are evenly distributed on the upper mold cover plate along the continuous fiber travel direction, and the height of the plurality of upper mold impregnation rollers decreases sequentially along the continuous fiber travel direction. The lower mold impregnation tank contains rollers distributed along the continuous fiber travel direction. A number of lower die impregnation rollers are evenly distributed. After the upper die cover plate is closed with the lower die impregnation tank, the upper die impregnation rollers and the lower die impregnation rollers are arranged alternately. The support frame is connected to the outside of the lower die impregnation tank and is arranged at the continuous fiber inlet. The lower die impregnation tank is open at the continuous fiber inlet and has a hole at the continuous fiber outlet. The traction mechanism is connected to the upper die cover plate and controls the opening and closing of the upper die cover plate to perform periodic lifting and lowering movements. Heating mechanisms are provided in the upper die cover plate and the lower die impregnation tank.

[0007] Furthermore, the support frame includes a support roller, a support rod, and a connecting rod. One end of the support rod is connected to the support roller, and the other end is connected to the lower mold impregnation tank via a rotating shaft. The lower mold impregnation tank is provided with two pins near the continuous fiber inlet. The connecting rod is provided with downward-facing grooves at intervals. One end of the connecting rod is connected to the support rod via a rotating shaft. The grooves on the connecting rod are engaged with the pins. The height of the support roller is higher than the bottom end of the first upper mold impregnation roller at the continuous fiber inlet.

[0008] Furthermore, the traction mechanism includes a traction screw and a servo motor, the traction screw being connected to the top of the upper mold cover plate, and the servo motor being connected to the traction screw.

[0009] Furthermore, the heating mechanism includes heating rods and temperature sensors. Multiple heating rods are provided in both the upper mold cover plate and the lower mold immersion tank, and temperature sensors are provided on both the upper mold cover plate and the lower mold immersion tank.

[0010] Furthermore, the upper mold cover plate has a length of not less than 1000mm, a thickness of not less than 30mm, and a width greater than the width of the prepreg tape. The width of the prepreg tape is 40mm to 300mm. The upper mold impregnation rollers have a number of not less than 5, with a height decrease gradient of 5-10mm along the continuous fiber travel direction. The height of the upper mold impregnation rollers is lower than the depth of the lower mold impregnation tank, and the upper mold impregnation rollers are not less than 40mm. The lower mold impregnation tank matches the size of the upper mold cover plate. The depth of the lower mold impregnation tank is not less than 80mm, and the height is not less than 110mm. The height of the opening at the continuous fiber outlet of the lower mold impregnation tank is 1mm.

[0011] Furthermore, the lower mold impregnation roller includes a roller section and a flow channel. The height of the roller section is the same as the depth of the lower mold impregnation tank. The flow channel has an arc-shaped structure, and the arc-shaped structure is tangent to the bottom of both the roller section and the lower mold impregnation tank. The width of the flow channel is the same as the width of the lower mold impregnation tank. Both the upper mold impregnation roller and the lower mold impregnation roller are provided with bolt holes. Both the upper mold cover plate and the lower mold impregnation tank are provided with grooves and screw holes. The upper mold impregnation roller and the lower mold impregnation roller are inserted into the grooves and fixed by bolts. The size of the groove matches the upper mold impregnation roller and the lower mold impregnation roller, and the groove depth is not less than 5mm.

[0012] Furthermore, the width of the upper mold impregnation roller and the roller section is 20-30mm wider than the width of the lower mold impregnation tank. After the upper mold cover plate is closed with the lower mold impregnation tank, the upper mold impregnation roller is inserted into the groove of the lower mold impregnation roller. The upper mold impregnation roller and the lower mold impregnation roller are evenly spaced, and the roller spacing is not less than 80mm. The impregnation rollers near the continuous fiber inlet and outlet are both upper mold impregnation rollers.

[0013] Furthermore, the continuous fiber is carbon fiber, glass fiber or basalt fiber, and the thermoplastic resin is polyetheretherketone, polyetherimide, polyphenylene sulfide or polyetherketone.

[0014] The present invention also provides a method for preparing an impregnation mold based on a continuous fiber thermoplastic resin prepreg tape, which includes the following steps:

[0015] Step 1: Lift the upper mold cover plate, pass the dispersed continuous fibers through the inside of the impregnation mold, and raise the support frame to the specified height;

[0016] Step 2: Close the upper mold cover and turn on the heating mechanism to heat the impregnation mold to the resin melting impregnation temperature;

[0017] Step 3: Raise the upper die cover plate to the height where only the first upper die impregnation roller near the continuous fiber inlet is in contact with the fiber bundle, turn on the extruder traction device, and while coating the surface of the continuous fiber bundle with resin melt, pull the fiber bundle into the impregnation mold.

[0018] Step 4: After the production line stabilizes, start the traction mechanism and control the upper mold cover plate to make periodic lifting and lowering movements to impregnate the fiber bundles. After cooling and molding, a continuous fiber-reinforced thermoplastic resin prepreg tape is obtained.

[0019] Furthermore, in step 4, the periodic lifting and lowering motion of the upper mold cover plate is a complete cycle that starts from the fully closed state of the upper mold cover plate, continues until the upper mold cover plate rises to the point where only the first upper mold impregnation roller near the continuous fiber inlet is in contact with the fiber bundle, and then descends to the fully closed state. When the upper mold cover plate reaches the highest point, the resin in the mold is still in a molten state, and the cycle frequency is 1 to 4 cycles per minute.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The present invention employs a structural design that combines the periodic lifting and lowering motion of the impregnation rollers with decreasing height with the impregnation mold, which can remove the fiber strands generated in the mold during the impregnation process. At the same time, the impregnation rollers with decreasing height evenly spread the resin buildup on the upper part of the prepreg tape, preventing the resin from continuously accumulating and thus improving the surface quality of the prepreg tape;

[0022] (2) The present invention features an adjustable fiber support frame at the mold inlet, providing sufficient space for the resin extruder and simplifying operation. Combined with the opening design at the mold inlet, this prevents molten resin from accumulating at the mold inlet, reducing damage to the fibers.

[0023] (3) The present invention adopts a design of lower mold impregnation roller plus flow channel to reduce the space of lower mold impregnation tank, accelerate the rapid accumulation of molten resin in the mold, form resin cavity, and improve impregnation efficiency.

[0024] (4) The melt impregnation mold and method for preparing continuous fiber reinforced high viscosity thermoplastic resin prepreg tape described in this invention are easy to process, simple to operate, can achieve continuous production, have high production efficiency, and have a wide range of applications. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the main structure of the impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to the present invention.

[0027] Figure 2 This is a schematic diagram of the left-hand structure of the impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to the present invention.

[0028] Figure 3This is a right-side view of the impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to the present invention.

[0029] Figure 4 This is a top view schematic diagram of the impregnation mold structure for a continuous fiber thermoplastic resin prepreg tape according to the present invention;

[0030] Figure 5 This is a schematic diagram of the continuous fiber inlet of the impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to the present invention.

[0031] Figure 6 This is a cross-sectional schematic diagram of the impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to the present invention.

[0032] Figure 7 This is a bottom view of the upper mold cover plate of the present invention;

[0033] Figure 8 This is a top view of the lower mold immersion tank described in this invention.

[0034] Figure 9 This is a schematic diagram of the upper mold impregnation roller structure described in this invention;

[0035] Figure 10 This is a schematic diagram of the lower mold impregnation roller structure described in this invention.

[0036] In the picture:

[0037] 1-Upper mold cover plate, 2-Lower mold immersion tank, 3-Upper mold immersion roller, 4-Lower mold immersion roller, 5-Support frame, 6-Traction screw, 7-Heating rod, 201-Pin, 501-Support roller, 502-Support rod, 503-Connecting rod. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0039] See Figure 1-10This embodiment describes an impregnation mold for a continuous fiber thermoplastic resin prepreg tape. It includes an upper mold cover plate 1, a lower mold impregnation tank 2, upper mold impregnation rollers 3, lower mold impregnation rollers 4, a support frame 5, a traction mechanism, and a heating mechanism. The upper mold cover plate 1 covers the lower mold impregnation tank 2. A plurality of upper mold impregnation rollers 3 are evenly distributed along the continuous fiber travel direction on the lower part of the upper mold cover plate 1, with the height of the rollers decreasing sequentially along the continuous fiber travel direction. A plurality of rollers 3 are evenly distributed along the continuous fiber travel direction in the lower mold impregnation tank 2. A lower mold impregnation roller 4, after the upper mold cover plate 1 and the lower mold impregnation tank 2 are closed, the upper mold impregnation roller 3 and the lower mold impregnation roller 4 are arranged alternately, the support frame 5 is connected to the outside of the lower mold impregnation tank 2 and is arranged at the continuous fiber inlet, the lower mold impregnation tank 2 is in an open state at the continuous fiber inlet and has a hole at the continuous fiber outlet, the traction mechanism is connected to the upper mold cover plate 1, the traction mechanism controls the opening and closing of the upper mold cover plate 1 to perform periodic lifting and lowering movements, and a heating mechanism is provided in the upper mold cover plate 1 and the lower mold impregnation tank 2.

[0040] The support frame 5 includes a support roller 501, a support rod 502, and a connecting rod 503. One end of the support rod 502 is connected to the support roller 501, and the other end is connected to the lower die impregnation tank 2 via a rotating shaft. Two pins 201 are provided on the outer side of the lower die impregnation tank 2 near the continuous fiber inlet. The connecting rod 503 has downward-facing grooves spaced apart. One end of the connecting rod 503 is connected to the support rod 502 via a rotating shaft. The grooves on the connecting rod 503 are engaged with the pins 201. The position of the support roller 501 is controlled by the position of the grooves and the pins 201. The height of the support roller 501 is higher than the bottom end of the first upper die impregnation roller 3 at the continuous fiber inlet, and the distance between the support roller 501 and the die inlet should ensure that the resin extruder can operate normally.

[0041] The traction mechanism includes a traction screw 6 and a servo motor. The traction screw 6 is connected to the top of the upper mold cover plate 1, and the servo motor is connected to the traction screw 6. Through the cooperation of the traction screw 6 and the servo motor, the opening and closing and periodic lifting and lowering movement of the upper mold cover plate 1 are controlled.

[0042] The heating mechanism includes heating rods 7 and temperature sensors. Multiple heating rods 7 are provided in both the upper mold cover plate 1 and the lower mold immersion tank 2. Temperature sensors are provided on both the upper mold cover plate 1 and the lower mold immersion tank 2. The temperature sensors are used to detect the mold temperature. The temperature of the immersion mold is raised to 200℃-450℃ by multiple heating rods 7.

[0043] The upper mold cover plate 1 has a length of not less than 1000mm, a thickness of not less than 30mm, and a width slightly larger than the width of the prepreg tape. The width of the prepreg tape is 40mm to 300mm. The number of upper mold impregnation rollers 3 is not less than 5, and the height decreases by 5-10mm along the continuous fiber travel direction. The height of the upper mold impregnation rollers 3 is lower than the depth of the lower mold impregnation tank 2, and the upper mold impregnation rollers 3 are not less than 40mm. The lower mold impregnation tank 2 matches the size of the upper mold cover plate 1. The depth of the lower mold impregnation tank 2 is not less than 80mm, and the height is not less than 110mm. The height of the opening at the continuous fiber outlet of the lower mold impregnation tank 2 is 1mm.

[0044] The lower mold impregnation roller 4 includes a roller section and a flow channel. The height of the roller section is the same as the depth of the lower mold impregnation tank 2. The flow channel has an arc-shaped structure, and the arc-shaped structure is tangent to the bottom of the roller section and the lower mold impregnation tank 2. The width of the flow channel is the same as the width of the lower mold impregnation tank 2. Both the upper mold impregnation roller 3 and the lower mold impregnation roller 4 are provided with bolt holes. Both the upper mold cover plate 1 and the lower mold impregnation tank 2 are provided with grooves and screw holes. The upper mold impregnation roller 3 and the lower mold impregnation roller 4 are inserted into the grooves and fixed by bolts. The size of the groove matches the upper mold impregnation roller 3 and the lower mold impregnation roller 4, and the groove depth is not less than 5mm.

[0045] The width of the upper mold impregnation roller 3 and the roller section is 20-30mm greater than the width of the lower mold impregnation tank 2. After the upper mold cover plate 1 is closed with the lower mold impregnation tank 2, the upper mold impregnation roller 3 is inserted into the groove of the lower mold impregnation roller 4. The upper mold impregnation roller 3 and the lower mold impregnation roller 4 are evenly spaced, and the roller spacing is not less than 80mm. The impregnation rollers near the continuous fiber inlet and outlet are both upper mold impregnation rollers 3.

[0046] The continuous fiber is a continuous fiber such as carbon fiber (CF), glass fiber (GF), or basalt fiber (BF); the thermoplastic resin is a high-viscosity thermoplastic resin such as polyether ether ketone (PEEK), polyetherimide (PEI), polyphenylene sulfide (PPS), or polyether ketone (PEK).

[0047] This embodiment describes a method for preparing an impregnation mold using the aforementioned continuous fiber thermoplastic resin prepreg tape, which includes the following steps:

[0048] Step 1: Lift the upper mold cover plate 1, pass the dispersed continuous fibers through the inside of the impregnation mold, and raise the support frame 5 to a suitable height;

[0049] Step 2: Close the upper mold cover plate 1, turn on the heating mechanism, and heat the impregnation mold to the resin melting impregnation temperature;

[0050] Step 3: Raise the upper die cover plate 1 to the height where only the first upper die impregnation roller 3 near the continuous fiber inlet is in contact with the fiber bundle, turn on the extruder traction device, and while coating the surface of the continuous fiber bundle with resin melt, pull the fiber bundle into the impregnation mold.

[0051] Step 4: After the production line stabilizes, start the traction mechanism and control the upper mold cover plate 1 to perform periodic lifting and lowering movements to impregnate the fiber bundles. After cooling and molding, a continuous fiber-reinforced thermoplastic resin prepreg tape is obtained.

[0052] The periodic lifting and lowering motion of the upper mold cover plate 1 is a complete cycle that starts from the fully closed state of the upper mold cover plate 1, rises to the point where only the first upper mold impregnation roller 3 near the continuous fiber inlet is in contact with the fiber bundle, and then falls back to the fully closed state. When the upper mold cover plate 1 reaches the highest point, the resin in the mold is still in a molten state. The cycle frequency is 1 to 4 cycles per minute.

[0053] This embodiment takes the melt impregnation process of continuous carbon fiber reinforced polyphenylene sulfide (PPS) prepreg tape as an example. The specific process is as follows:

[0054] Step 1: Lift the upper mold cover plate 1, pass the dispersed continuous carbon fiber through the inside of the impregnation mold, and raise the support frame 5 to a suitable height;

[0055] Step 2: Close the upper mold cover plate 1, turn on the heating mechanism, and heat the immersion mold to 290℃-330℃;

[0056] Step 3: Raise the upper die cover plate 1 to the height where only the first upper die impregnation roller 3 near the continuous fiber inlet is in contact with the carbon fiber bundle, turn on the extruder traction device, and while coating the surface of the continuous fiber bundle with PPS resin melt, pull the fiber bundle into the impregnation mold.

[0057] Step 4: After the production line stabilizes, start the traction mechanism and control the upper mold cover plate 1 to perform periodic lifting and lowering movements to impregnate the fiber bundles. After cooling and molding, a continuous carbon fiber reinforced polyphenylene sulfide (PPS) prepreg tape is obtained.

[0058] This embodiment takes the melt impregnation process of continuous carbon fiber reinforced polyetheretherketone (PEEK) prepreg tape as an example. The specific process is as follows:

[0059] Step 1: Lift the upper mold cover plate 1, pass the dispersed continuous carbon fiber through the inside of the impregnation mold, and raise the support frame 5 to a suitable height;

[0060] Step 2: Close the upper mold cover plate 1, turn on the heating mechanism, and heat the immersion mold to 360℃-420℃;

[0061] Step 3: Raise the upper die cover plate 1 to the height where only the first upper die impregnation roller 3 near the continuous fiber inlet is in contact with the fiber bundle, turn on the extruder traction device, and while coating the surface of the continuous fiber bundle with PEEK resin melt, pull the fiber bundle into the impregnation mold.

[0062] Step 4: After the production line stabilizes, start the traction mechanism and control the upper mold cover plate 1 to perform periodic lifting and lowering movements to impregnate the fiber bundles. After cooling and molding, a continuous carbon fiber reinforced polyether ether ketone (PEEK) prepreg tape is obtained.

[0063] The structural design, employing a combination of height-decreasing impregnation rollers and the cyclic lifting motion of the impregnation die, effectively removes fiber strands generated during the impregnation process. Simultaneously, the height-decreasing impregnation rollers evenly spread the resin buildup on the upper part of the prepreg tape, preventing continuous resin accumulation and improving the surface quality of the prepreg tape. An adjustable fiber support frame at the die inlet provides sufficient space for the resin extruder, simplifying operation. The opening design at the die inlet prevents molten resin buildup, reducing fiber damage. The design of the lower die impregnation roller with a flow channel reduces the space of the lower die impregnation tank, accelerating the rapid accumulation of molten resin in the die to form a resin cavity and improve impregnation efficiency. The system is easy to process, simple to operate, allows for continuous production, boasts high production efficiency, and has a wide range of applications.

[0064] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. An impregnation mold for a continuous fiber thermoplastic resin prepreg tape, characterized in that: It includes an upper mold cover plate (1), a lower mold impregnation tank (2), upper mold impregnation rollers (3), lower mold impregnation rollers (4), a support frame (5), a traction mechanism, and a heating mechanism. The upper mold cover plate (1) covers the lower mold impregnation tank (2). The upper mold cover plate (1) has several upper mold impregnation rollers (3) evenly distributed along the continuous fiber travel direction. The height of the several upper mold impregnation rollers (3) decreases sequentially along the continuous fiber travel direction. The lower mold impregnation tank (2) has several lower mold impregnation rollers (4) evenly distributed along the continuous fiber travel direction. The upper mold cover plate... (1) After being covered by the lower mold impregnation tank (2), the upper mold impregnation roller (3) and the lower mold impregnation roller (4) are arranged alternately. The support frame (5) is connected to the outside of the lower mold impregnation tank (2) and is arranged at the continuous fiber inlet. The lower mold impregnation tank (2) is open at the continuous fiber inlet and has a hole at the continuous fiber outlet. The traction mechanism is connected to the upper mold cover plate (1). The traction mechanism controls the opening and closing of the upper mold cover plate (1) to perform periodic lifting and lowering movements. The upper mold cover plate (1) and the lower mold impregnation tank (2) are equipped with heating mechanisms.

2. The impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 1, characterized in that: The support frame (5) includes a support roller (501), a support rod (502), and a connecting rod (503). One end of the support rod (502) is connected to the support roller (501), and the other end is connected to the lower mold impregnation tank (2) through a rotating shaft. The lower mold impregnation tank (2) is provided with two pins (201) near the continuous fiber inlet. The connecting rod (503) is provided with downward-facing grooves at intervals. One end of the connecting rod (503) is connected to the support rod (502) through a rotating shaft. The grooves on the connecting rod (503) are engaged with the pins (201). The height of the support roller (501) is higher than the bottom end of the first upper mold impregnation roller (3) at the continuous fiber inlet.

3. The impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 1, characterized in that: The traction mechanism includes a traction screw (6) and a servo motor. The traction screw (6) is connected to the top of the upper mold cover plate (1), and the servo motor is connected to the traction screw (6).

4. The impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 1, characterized in that: The heating mechanism includes heating rods (7) and temperature sensors. Multiple heating rods (7) are provided in both the upper mold cover plate (1) and the lower mold immersion tank (2). Temperature sensors are provided on both the upper mold cover plate (1) and the lower mold immersion tank (2).

5. The impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 1, characterized in that: The upper mold cover plate (1) has a length of not less than 1000mm, a thickness of not less than 30mm, and a width greater than the width of the prepreg tape. The width of the prepreg tape is 40mm to 300mm. The number of upper mold impregnation rollers (3) is not less than 5, and the height decreases by 5-10mm along the continuous fiber travel direction. The height of the upper mold impregnation rollers (3) is lower than the depth of the lower mold impregnation tank (2), and the upper mold impregnation rollers (3) are not less than 40mm. The lower mold impregnation tank (2) matches the size of the upper mold cover plate (1). The depth of the lower mold impregnation tank (2) is not less than 80mm, and the height is not less than 110mm. The height of the opening at the continuous fiber outlet of the lower mold impregnation tank (2) is 1mm.

6. The impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 1, characterized in that: The lower mold impregnation roller (4) includes a roller section and a flow channel. The height of the roller section is the same as the depth of the lower mold impregnation tank (2). The flow channel has an arc-shaped structure, and the arc-shaped structure is tangent to the bottom of the roller section and the lower mold impregnation tank (2). The width of the flow channel is the same as the width of the lower mold impregnation tank (2). The upper mold impregnation roller (3) and the lower mold impregnation roller (4) are provided with bolt holes. The upper mold cover plate (1) and the lower mold impregnation tank (2) are provided with grooves and screw holes. The upper mold impregnation roller (3) and the lower mold impregnation roller (4) are inserted into the grooves and fixed by bolts. The size of the groove matches the upper mold impregnation roller (3) and the lower mold impregnation roller (4) and the groove depth is not less than 5mm.

7. The impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 6, characterized in that: The width of the upper mold impregnation roller (3) and the roller section is 20-30mm wider than the width of the lower mold impregnation tank (2). After the upper mold cover plate (1) is closed with the lower mold impregnation tank (2), the upper mold impregnation roller (3) is inserted into the groove of the lower mold impregnation roller (4). The upper mold impregnation roller (3) and the lower mold impregnation roller (4) are evenly spaced, and the roller spacing is not less than 80mm. The impregnation rollers near the continuous fiber inlet and outlet are both upper mold impregnation rollers (3).

8. The impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 1, characterized in that: The continuous fiber is carbon fiber, glass fiber or basalt fiber, and the thermoplastic resin is polyetheretherketone, polyetherimide, polyphenylene sulfide or polyetherketone.

9. A method for preparing an impregnation mold based on the continuous fiber thermoplastic resin prepreg tape according to claim 1, characterized in that: It includes the following steps: Step 1: Lift the upper mold cover plate (1), pass the dispersed continuous fibers through the inside of the impregnation mold, and raise the support frame (5) to the specified height; Step 2: Close the upper mold cover plate (1), turn on the heating mechanism, and heat the impregnation mold to the resin melting impregnation temperature; Step 3: Raise the upper die cover plate (1) to the height where only the first upper die impregnation roller (3) near the continuous fiber inlet is in contact with the fiber bundle, turn on the extruder traction device, and while coating the surface of the continuous fiber bundle with resin melt, pull the fiber bundle into the impregnation mold. Step 4: After the production line is stable, turn on the traction mechanism and control the upper mold cover plate (1) to make periodic lifting and lowering movements to achieve fiber bundle impregnation. After cooling and molding, a continuous fiber reinforced thermoplastic resin prepreg tape is obtained.

10. The method for preparing an impregnation mold for a continuous fiber thermoplastic resin prepreg tape according to claim 9, characterized in that: In step 4, the periodic lifting and lowering motion of the upper mold cover plate (1) starts from the fully closed state of the upper mold cover plate (1), and continues until the upper mold cover plate (1) rises to the point where only the first upper mold impregnation roller (3) near the continuous fiber inlet is in contact with the fiber bundle, and then falls back to the fully closed state. The resin in the mold is still in a molten state when the upper mold cover plate (1) reaches the highest point, and the cycle frequency is 1 to 4 cycles per minute.

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