A kind of thermoplastic resin based prepreg melt impregnation mold and method

Abstract

The present invention proposes a melt impregnation mold and method for thermoplastic resin-based prepreg (tape), belonging to the field of melt impregnation molds and processes. The invention solves the problem that the existing melt impregnation mold is difficult to complete the continuous impregnation process of thermoplastic resin on fiber and the impregnation efficiency is low. It includes an upper mold and a lower mold, the upper mold is covered on the upper part of the lower mold, the upper mold includes an upper mold cover plate, an upper mold impregnation roller and an upper mold guide roller, the number of the upper mold impregnation rollers is multiple, and the multiple upper mold impregnation rollers are arranged below the upper mold cover plate at intervals along the length direction of the upper mold cover plate, and an upper mold guide roller is arranged below the upper mold cover plate, and the lower mold includes two lower mold side plates, a lower mold middle plate, a rotating impregnation roller, a rotating guide roller and a rotating calendering roller, and the two lower mold side plates are arranged on both sides of the lower mold middle plate in the width direction. It is mainly used for melt impregnation of thermoplastic resin-based prepreg (tape).

Description

Technical Field

[0001] The invention belongs to the field of melt impregnation molds and processes, and particularly relates to a melt impregnation mold and a method for thermoplastic resin-based prepreg. Background Art

[0002] With the development and progress in the field of polymer composites, thermoplastic composites have become a hot topic of research in recent years due to their advantages such as high strength, high toughness, impact resistance, wear resistance, short molding cycle, and recyclability. Thermoplastic composite products with thermoplastic resins such as PEEK, PPS, PA, PP as the matrix phase and carbon fiber, glass fiber, etc. as the reinforcement phase are of great application value in the fields of aerospace, automotive industry, medical care, transportation, civil engineering, leisure sports, etc.

[0003] The key to preparing thermoplastic composite materials is to prepare continuous, stable and excellent performance prepreg products. The current mainstream prepreg preparation methods are: melt impregnation method, solution impregnation method, powder impregnation method and film lamination method, among which the melt impregnation method has gradually become the mainstream prepreg preparation method due to its simple operation, high production efficiency and mechanized production.

[0004] The process of preparing prepreg by melt impregnation is as follows: the fiber passes through the creel, the fiber bundle is dispersed by the yarn separation system, and then preheated and desized. After being treated by the yarn spreading system, the fiber bundle is spread into fiber filaments. The molten resin extruded by the extruder is spread on the surface of the fiber filaments, and the resin is impregnated into the fiber through the melt impregnation mold. After calendering, it is made into a prepreg tape product, and the whole melt impregnation process is completed by the traction system and the winding system. The core step of this process is the impregnation of the fiber filaments with the molten resin, and the core equipment is the melt impregnation mold. Excellent melt impregnation molds have the advantages of continuity, high efficiency, and industrialization.

[0005] However, due to the late start of research on thermoplastic composites in my country, the impregnation mold equipment is backward, the properties of prepreg tapes such as impregnation degree, porosity, and fiber content are limited, and the fiber breakage problem during the impregnation process is serious. The continuous production of prepreg tape products is seriously challenged, which greatly limits the development and application of the field of thermoplastic composites. Therefore, it is very necessary to develop advanced and efficient melt impregnation equipment. Summary of the invention

[0006] In view of this, the present invention aims to provide a melt impregnation mold and method for thermoplastic resin-based prepregs to solve the problem that the existing melt impregnation mold is difficult to complete the continuous impregnation process of thermoplastic resin on fibers and the impregnation efficiency is low.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a melt impregnation mold for thermoplastic resin-based prepreg, which comprises an upper mold and a lower mold, wherein the upper mold is covered on the upper part of the lower mold, the upper mold comprises an upper mold cover plate, an upper mold dipping roller and an upper mold guide roller, the upper mold dipping roller is in multiple numbers, and the multiple upper mold dipping rollers are arranged below the upper mold cover plate at intervals along the length direction of the upper mold cover plate, an upper mold guide roller is arranged below the upper mold cover plate, the lower mold comprises two lower mold side plates, a lower mold middle plate, a rotating dipping roller, a rotating guide roller and a rotating calendering roller, the two lower mold side plates are arranged on both sides of the lower mold middle plate in the width direction, and the rotating impregnation roller is arranged below the upper mold cover plate. There are multiple impregnation rollers, and the multiple rotating impregnation rollers are arranged between the two lower mold side plates and rotate at intervals along the length direction of the lower mold side plate. A driving sprocket is arranged at one end of each rotating impregnation roller, one of the driving sprockets is connected to the frequency conversion motor, and the multiple driving sprockets are connected by a transmission chain. The upper mold impregnation roller is located between adjacent rotating impregnation rollers, and a rotating guide roller and a rotating calendering roller are arranged between the two lower mold side plates. The lower surface of the upper mold guide roller is tangent to the center of the rotating impregnation roller, and multiple heating rods are arranged in the upper mold cover plate and the lower mold middle plate along the length direction. The upper mold and the lower mold are provided with mold baffles on the entrance and exit.

[0008] Furthermore, the rotating calendering roller is a multi-stage height-adjustable structure, and the gaps between each row of rollers should be gradually reduced in a gradient with a spacing of 0.3 mm.

[0009] Furthermore, the diameter of the upper die dipping roller is smaller than the diameter of the rotating dipping roller.

[0010] Furthermore, the diameters of the upper die dipping roller and the rotating dipping roller are 15 to 30 mm.

[0011] Furthermore, the number of the upper die impregnation roller and the rotating impregnation roller is 6 to 12.

[0012] Furthermore, the diameters of the rotating impregnation roller and the rotating guide roller are the same.

[0013] Furthermore, the rotating impregnation roller is connected to the driving sprocket through a rotating bearing.

[0014] The present invention also provides a method for impregnating a thermoplastic resin-based prepreg melt impregnation mold, which comprises the following steps:

[0015] Step 1: Open the upper mold cover plate, pass the fully expanded fiber bundle into the mold from the mold entrance, and pass it out from the mold exit through the rotating calender roller;

[0016] Step 2: Spread the thermoplastic molten resin extruded by the extruder on the fiber bundle and let it enter the mold under the action of the traction machine;

[0017] Step 3: The upper mold cover plate is dropped, and the thermoplastic molten resin is evenly dispersed on the surface of the fiber bundle under the action of the upper mold guide roller;

[0018] Step 4: Under the action of traction, fiber pretension and impregnation roller pressure, the thermoplastic molten resin radially penetrates the fiber bundle to complete the impregnation process;

[0019] Step 5: Under the pressure of the multi-level gradient rotating calender roller and the exit mold baffle, the prepreg tape that has completed the impregnation process obtains a "secondary impregnation" effect, and the width and thickness are limited;

[0020] Step 6: The speed of the transmission chain is adjusted by the motor to change the impregnation pressure on the rotating impregnation roller to meet the impregnation requirements of thermoplastic resins with different viscosities;

[0021] Step 7: The fiber filaments broken during the threading and impregnation process are pulled to the outside of the mold by the rotating guide roller, the rotating impregnation roller and the rotating calender roller.

[0022] Furthermore, the rotation direction of the rotating impregnation roller is consistent with the pulling direction.

[0023] Furthermore, the thermoplastic molten resin is engineering thermoplastic resin PP, PA or special thermoplastic resin PEEK, PPS, PI.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention improves the fiber impregnation efficiency by setting up a preheating zone, an impregnation zone, and a cooling zone, and realizes the continuity of the impregnation process by combining a moving roller and a fixed roller. It has the following advantages:

[0025] 1. The design of the driving sprocket and the transmission chain in conjunction with the rotating impregnation roller will greatly reduce the fiber breakage caused by excessive pressure in the "wedge-shaped impregnation zone" of the impregnation roller, and can pull out the broken fibers in time to alleviate the blockage problem caused by the accumulation of fibers and resin.

[0026] 2. The rotating impregnation roller can be used in conjunction with a variable frequency motor to dynamically adjust the impregnation roller speed and dynamically adjust the impregnation pressure while reducing the fiber breakage rate to meet the impregnation requirements of different resins.

[0027] 3. The impregnation mold is divided into three areas: preheating area, impregnation area, and cooling area. The design of the three areas meets the use requirements of most thermoplastic resins at 200-400°C, modularizes the impregnation process, and improves the impregnation efficiency.

[0028] 4. The design of the guide roller in the preheating zone evenly spreads the resin that has just entered the mold on the surface of the fiber bundle, which is conducive to the uniform distribution of the resin in the impregnation zone inside the fiber bundle and completes the impregnation process.

[0029] 5. The multi-level adjustable height rotating calender rollers in the cooling zone limit the thickness, width and other geometric dimensions of the prepreg tape and facilitate its shaping.

[0030] 6. The "open and close" design of the melt impregnation mold facilitates the threading of the mold before use, adjustment during use, and cleaning after use.

[0031] 7. The baffles before and after the melt impregnation mold and a certain number of evenly arranged heating rods and insulation boards ensure constant temperature during use, reducing the problems of low impregnation efficiency and poor impregnation effect caused by environmental factors such as heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the main structure of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0034] Figure 2 It is a left-side structural schematic diagram of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0035] Figure 3 It is a right side structural schematic diagram of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0036] Figure 4 This is a schematic front structural view of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0037] Figure 5 It is a schematic diagram of the rear view structure of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0039] Figure 7 This is a bottom view of the structure of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0040] Figure 8 It is a schematic diagram of the longitudinal cross-sectional structure of a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0041] Fig. 9 This is a schematic diagram of the main structure of an upper mold in a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0042] Fig.10 This is a schematic diagram of the structure of an upper mold from a bottom view in a melt impregnation mold for a thermoplastic resin-based prepreg according to the present invention;

[0043] Fig.11 This is a schematic diagram of the main structure of the lower mold in a melt impregnation mold for thermoplastic resin-based prepreg according to the present invention;

[0044] Fig.12 The present invention is a schematic diagram of the structure of the lower mold in a melt impregnation mold for thermoplastic resin-based prepreg as described in the present invention.

[0045] 1-upper mold cover plate, 2-lower mold side plate, 3-lower mold middle plate, 4-upper mold impregnation roller, 5-upper mold guide roller, 6-rotating impregnation roller, 7-rotating guide roller, 8-rotating calendering roller, 9-driving sprocket, 10-transmission chain, 11-mold baffle, 12-heating rod, 13-connecting bolts. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0047] See also Figure 1-12 The present embodiment is described, a melt impregnation mold for thermoplastic resin-based prepreg, which includes an upper mold and a lower mold, wherein the upper mold is covered on the upper part of the lower mold, the upper mold includes an upper mold cover plate 1, an upper mold dipping roller 4 and an upper mold guide roller 5, the upper mold dipping roller 4 is multiple in number, and the multiple upper mold dipping rollers 4 are arranged below the upper mold cover plate 1 at intervals along the length direction of the upper mold cover plate 1, and an upper mold guide roller 5 is arranged below the upper mold cover plate 1, the lower mold includes two lower mold side plates 2, a lower mold middle plate 3, a rotating dipping roller 6, a rotating guide roller 7 and a rotating calendering roller 8, the two lower mold side plates 2 are arranged on both sides of the lower mold middle plate 3 in the width direction, the rotating dipping roller 6 is multiple in number, and the multiple upper mold dipping rollers 4 are arranged below the upper mold cover plate 1 at intervals along the length direction of the upper mold cover plate 1, and the upper mold guide roller 5 is arranged below the upper mold cover plate 1, the lower mold includes two lower mold side plates 2, a lower mold middle plate 3, a rotating dipping roller 6, a rotating guide roller 7 and a rotating calendering roller 8, the two lower mold side plates 2 are arranged on both sides of the lower mold middle plate 3 in the width direction, the rotating dipping roller 6 is multiple in number, and the upper mold guide roller 5 is arranged below the upper mold cover plate 1. The rotating impregnation rollers 6 are arranged between the two lower mold side plates 2 and rotate at intervals along the length direction of the lower mold side plate 2. A driving sprocket 9 is arranged at one end of each rotating impregnation roller 6, one of which is connected to the variable frequency motor, and multiple driving sprockets 9 are connected by a transmission chain 10. The upper mold impregnation roller 4 is located between adjacent rotating impregnation rollers 6. A rotating guide roller 7 and a rotating calendering roller 8 are arranged between the two lower mold side plates 2. The lower surface of the upper mold guide roller 5 is tangent to the center of the rotating impregnation roller 6. Multiple heating rods 12 are arranged in the upper mold cover plate 1 and the lower mold middle plate 3 along the length direction. The upper mold and the lower mold are provided with mold baffles 11 on the entrance and exit.

[0048] The mold described in this embodiment forms three areas, namely a preheating area, an impregnation area, and a cooling area.

[0049] The preheating zone includes an upper mold guide roller 5 and a rotating guide roller 7. The size and number of the rollers are selected according to the actual scale of the production line. When the upper mold cover plate 1 falls, the lower surface of the upper mold guide roller 5 should be tangent to the center of the rotating impregnation roller 6, so that the resin entering the mold is evenly spread on the surface of the fiber bundle, improving the impregnation efficiency of the subsequent impregnation zone. The diameter of the rotating guide roller 7 is the same as that of the rotating impregnation roller 6, and it rotates freely with the traction force.

[0050] The impregnation area includes a multi-stage upper mold impregnation roller 4 and a rotating impregnation roller 6. According to the scale of the prepreg production line and the type of resin, the number of the upper mold impregnation roller 4 and the rotating impregnation roller 6 is selected between 6 and 12, and the diameter of the upper mold impregnation roller 4 and the rotating impregnation roller 6 is 15 to 30 mm. In order to alleviate the fiber breakage caused by the impregnation pressure, the diameter of the upper mold impregnation roller 4 should be slightly smaller than the diameter of the rotating impregnation roller 6. The rotating impregnation roller 6 is connected to the driving sprocket 9 through a rotating bearing and is connected to the variable frequency motor through a transmission chain 10. The rotation direction of the rotating impregnation roller 6 should be consistent with the traction direction, and the rotation speed of the rotating impregnation roller 6 is adjusted by the variable frequency motor to change the impregnation pressure.

[0051] The cooling zone includes a multi-stage adjustable height rotating calendering roller 8, and the gaps between each row of rollers should be gradually reduced with a spacing of 0.3mm. The length of the cooling zone is selected according to the type of resin. For resins such as PA and PP, the length of the cooling zone should be slightly reduced; for resins such as PEEK that are melt-impregnated at high temperatures, the cooling zone should be appropriately lengthened to establish a buffer zone between the high-temperature impregnation zone and the calendering process at room temperature, limit the dimensional requirements such as the thickness and width of the prepreg tape, and facilitate its shaping.

[0052] The upper die guide roller 5 should be set to 3 to 5 different types according to the height to meet the impregnation requirements of different resins and change the fiber covering angle.

[0053] This embodiment is a method for impregnating a thermoplastic resin-based prepreg melt impregnation mold, which includes the following steps:

[0054] Step 1: Open the upper mold cover plate 1, pass the fully expanded fiber bundle into the mold from the mold entrance, and pass it out from the mold exit through the rotating calender roller 8;

[0055] Step 2: Spread the thermoplastic molten resin extruded by the extruder on the fiber bundle and let it enter the mold under the action of the traction machine;

[0056] Step 3: The upper mold cover plate 1 is dropped, and the thermoplastic molten resin is evenly dispersed on the surface of the fiber bundle under the action of the upper mold guide roller 5;

[0057] Step 4: Under the action of traction, fiber pretension and impregnation roller pressure, the thermoplastic molten resin radially penetrates the fiber bundle to complete the impregnation process;

[0058] Step 5: Under the pressure of the multi-level gradient rotating calender roller 8 and the exit end mold baffle 11, the prepreg tape that has completed the impregnation process obtains a "secondary impregnation" effect, and the width and thickness are limited;

[0059] Step 6: adjusting the rotation speed of the transmission chain 10 by the motor to change the impregnation pressure on the rotating impregnation roller 6 to meet the impregnation requirements of thermoplastic resins with different viscosities;

[0060] Step 7: The fiber filaments broken during the threading and impregnation process are pulled to the outside of the mold by the rotating guide roller 7, the rotating impregnation roller 6 and the rotating calender roller 8.

[0061] In the embodiment, the rotating direction of the rotating impregnation roller 6 is consistent with the pulling direction. The thermoplastic molten resin is engineering thermoplastic resin PP, PA or special thermoplastic resin PEEK, PPS, PI.

[0062] This embodiment is a continuous carbon fiber reinforced polyetheretherketone prepreg tape melt impregnation process. The specific process is as follows:

[0063] Step 1: Open the upper mold cover plate 1, pass the fully unfolded carbon fiber bundle into the mold from the mold entrance, and pass it out from the mold exit through the rotating calender roller 8;

[0064] Step 2: Spread the molten PEEK resin extruded from the extruder on the carbon fiber bundle and let it enter the mold under the action of the traction machine;

[0065] Step 3: The upper mold cover plate 1 is dropped, and the PEEK resin is evenly dispersed on the surface of the carbon fiber bundle under the action of the upper mold guide roller 5;

[0066] Step 4: Under the action of traction, fiber pretension and impregnation roller pressure, the PEEK resin radially penetrates the carbon fiber bundle to complete the impregnation process;

[0067] Step 5: The rotation speed of the transmission chain 10 is adjusted by the motor to change the impregnation pressure on the rotating impregnation roller 6, thereby changing the impregnation efficiency of the fiber bundle with the PEEK resin.

[0068] This embodiment is a continuous glass fiber reinforced polypropylene prepreg tape melt impregnation process. The specific process is as follows:

[0069] Step 1: Open the upper mold cover plate 1, and let the fully expanded glass fiber bundle pass through the mold inlet into the mold, and pass through the mold outlet through the rotating calender roller 8;

[0070] Step 2: Spread the molten PP resin extruded from the extruder on the glass fiber bundle and let it enter the mold under the action of the traction machine;

[0071] Step 3: The upper mold cover plate 1 is dropped, and the PP resin is evenly dispersed on the surface of the glass fiber bundle under the action of the upper mold guide roller 5;

[0072] Step 4: Under the action of traction, fiber pretension and impregnation roller pressure, the PP resin radially penetrates the glass fiber bundle to complete the impregnation process;

[0073] Step 5: The rotation speed of the transmission chain 10 is adjusted by the motor to change the impregnation pressure on the rotating impregnation roller 6 and change the impregnation efficiency of the fiber bundle by the PP resin.

[0074] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A melt impregnation mold for thermoplastic resin-based prepreg, characterized in that: It comprises an upper die and a lower die, wherein the upper die is covered on the upper part of the lower die, the upper die comprises an upper die cover plate (1), an upper die dipping roller (4) and an upper die guide roller (5), the upper die dipping roller (4) is in plurality, the plurality of upper die dipping rollers (4) are arranged below the upper die cover plate (1) at intervals along the length direction of the upper die cover plate (1), an upper die guide roller (5) is arranged below the upper die cover plate (1), the lower die comprises two lower die side plates (2), a lower die middle plate (3), a rotating dipping roller (6), a rotating The invention relates to a rotary guide roller (7) and a rotary calender roller (8), wherein the two lower mold side plates (2) are arranged on both sides of the lower mold middle plate (3) in the width direction, and the number of the rotary impregnation rollers (6) is multiple, and the multiple rotary impregnation rollers (6) are arranged between the two lower mold side plates (2) in an interval rotation along the length direction of the lower mold side plates (2), and a driving sprocket (9) is arranged at one end of each rotating impregnation roller (6), wherein one of the driving sprockets (9) is connected to a variable frequency motor, and the multiple driving sprockets (9) are connected by a transmission chain. (10), the upper mold dipping roller (4) is located between adjacent rotating dipping rollers (6), a rotating guide roller (7) and a rotating calendering roller (8) are arranged between the two lower mold side plates (2), the lower surface of the upper mold guide roller (5) is tangent to the center of the rotating dipping roller (6), a plurality of heating rods (12) are arranged in the upper mold cover plate (1) and the lower mold middle plate (3) along the length direction, the upper mold and the lower mold are both provided with mold baffles (11) at the inlet and outlet, the upper mold dipping roller ( 4) has a diameter smaller than that of the rotating impregnation roller (6); the rotating calendering roller (8) is a multi-stage adjustable height structure; the gaps between each row of rollers are gradually reduced at a spacing of 0.3 mm in a gradient; the mold forms three areas, namely a preheating area, an impregnation area, and a cooling area; the preheating area includes an upper mold guide roller (5) and a rotating guide roller (7); the impregnation area includes a multi-stage upper mold impregnation roller (4) and a rotating impregnation roller (6); and the cooling area includes a multi-stage adjustable height rotating calendering roller (8).

2. The melt impregnation mold for thermoplastic resin-based prepreg according to claim 1, characterized in that: The diameters of the upper die impregnation roller (4) and the rotating impregnation roller (6) are 15 to 30 mm.

3. The melt impregnation mold for thermoplastic resin-based prepreg according to claim 1, characterized in that: The number of the upper die impregnation roller (4) and the rotating impregnation roller (6) is 6 to 12.

4. The melt impregnation mold for thermoplastic resin-based prepreg according to claim 1, characterized in that: The diameters of the rotating impregnation roller (6) and the rotating guide roller (7) are the same.

5. The melt impregnation mold for thermoplastic resin-based prepreg according to claim 1, characterized in that: The rotating impregnation roller (6) is connected to the driving sprocket (9) via a rotating bearing.

6. A method for impregnating a thermoplastic resin-based prepreg melt impregnation mold according to claim 1, characterized in that: It includes the following steps: Step 1: Open the upper mold cover plate (1), pass the fully expanded fiber bundle into the mold from the mold entrance, and pass it out from the mold exit through the rotating calender roller (8); Step 2: Spread the thermoplastic molten resin extruded by the extruder on the fiber bundle and let it enter the mold under the action of the traction machine; Step 3: the upper mold cover plate (1) is dropped, and the thermoplastic molten resin is evenly dispersed on the surface of the fiber bundle under the action of the upper mold guide roller (5); Step 4: Under the action of traction, fiber pretension and impregnation roller pressure, the thermoplastic molten resin radially penetrates the fiber bundle to complete the impregnation process; Step 5: Under the pressure of the multi-level gradient rotating calender roller (8) and the outlet mold baffle (11), the prepreg tape that has completed the impregnation process obtains a "secondary impregnation" effect, and the width and thickness are limited; Step 6: adjusting the rotation speed of the transmission chain (10) by means of a motor to change the impregnation pressure on the rotating impregnation roller (6) to meet the impregnation requirements of thermoplastic resins with different viscosities; Step 7: The fiber filaments broken during the threading and impregnation process are pulled to the outside of the mold by the rotating guide roller (7), the rotating impregnation roller (6) and the rotating calender roller (8).

7. The impregnation method of a thermoplastic resin-based prepreg melt impregnation mold according to claim 6, characterized in that: The rotation direction of the rotating impregnation roller (6) is consistent with the traction direction.

8. The impregnation method of a thermoplastic resin-based prepreg melt impregnation mold according to claim 6, characterized in that: The thermoplastic molten resin is engineering thermoplastic resin PP, PA or special thermoplastic resin PEEK, PPS, PI.

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