Thermoplastic prepreg sheet and manufacturing apparatus therefor

Abstract

The embodiment of the utility model provides a thermoplastic prepreg sheet and manufacturing equipment thereof, and relates to the technical field of polymer composite materials. The thermoplastic prepreg sheet comprises a sheet body and a fiber felt, the sheet body comprises a fiber reinforcement body, a first thermoplastic resin film and a second thermoplastic resin film, and the first thermoplastic resin film and the second thermoplastic resin film are connected with the fiber reinforcement body in the thickness direction of the thermoplastic prepreg sheet; the fiber felt is connected with the second thermoplastic resin film, and the fiber felt covers the second thermoplastic resin film in the thickness direction of the thermoplastic prepreg sheet. According to the embodiment of the utility model, the fibrofelt of the thermoplastic prepreg sheet can isolate the sheet body from the conveying belt, so that the thermoplastic prepreg sheet is not adhered to the conveying belt, the thermoplastic prepreg sheet is easy to take after passing through a tunnel furnace, and the production efficiency of an upper cover of a battery pack can be further improved.

Description

Technical Field

[0001] This utility model relates to the field of polymer composite materials technology, and in particular to a thermoplastic prepreg sheet and its manufacturing equipment. Background Technology

[0002] Composite materials are widely used in battery packs for new energy vehicles due to their excellent lightweight and high strength properties.

[0003] In related technologies, thermoplastic prepreg sheets include fiber reinforcements and thermoplastic resin films connected to both sides of the fiber reinforcements. The thermoplastic prepreg sheets can be preheated in a tunnel furnace via a conveyor belt and then molded into battery pack covers using a compression molding process.

[0004] However, the thermoplastic prepreg sheets are difficult to remove after passing through the tunnel furnace, which reduces the production efficiency of the battery pack cover. Utility Model Content

[0005] This utility model provides a thermoplastic prepreg sheet and its manufacturing equipment to solve the problem of difficulty in retrieving thermoplastic prepreg sheets after passing through a tunnel furnace, which leads to a decrease in the production efficiency of battery pack covers.

[0006] On one hand, this utility model embodiment provides a thermoplastic prepreg sheet, comprising:

[0007] The sheet body includes a fiber reinforcement, a first thermoplastic resin film, and a second thermoplastic resin film, wherein the first thermoplastic resin film and the second thermoplastic resin film are respectively connected to the fiber reinforcement in the thickness direction of the thermoplastic prepreg sheet;

[0008] A fiber felt is connected to the second thermoplastic resin film, and the fiber felt covers the second thermoplastic resin film in the thickness direction of the thermoplastic prepreg sheet.

[0009] In one possible implementation, the weight ratio of the second thermoplastic resin film to the fiber felt is greater than or equal to 1 / 10 and less than or equal to 1 / 5.

[0010] In one possible implementation, the weight ratio of the first thermoplastic resin film to the fiber reinforcement is greater than or equal to 2 / 5 and less than or equal to 1 / 2.

[0011] In one possible implementation, the basis weight of the fiber felt is greater than or equal to 20 g / m². 2 And less than or equal to 100g / m 2 .

[0012] On the other hand, this utility model embodiment provides a manufacturing apparatus for thermoplastic prepreg sheets, applied to the thermoplastic prepreg sheets as described above, comprising:

[0013] The placement assembly includes a first placement member, a second placement member, a third placement member, and a fourth placement member, wherein the first placement member is used to provide a first thermoplastic resin film, the second placement member is used to provide a fiber reinforcement, the third placement member is used to provide a second thermoplastic resin film, and the fourth placement member is used to provide a fiber felt;

[0014] A heating device is located downstream of the placement assembly, and the heating device is used to heat the first thermoplastic resin film, the fiber reinforcement, the second thermoplastic resin film and the fiber felt that are stacked in sequence.

[0015] The first pressurizing device is located downstream of the heating device and is used to pressurize the heated first thermoplastic resin film, the fiber reinforcement, the second thermoplastic resin film, and the fiber felt.

[0016] A cooling device is located downstream of the first pressurizing device, and the cooling device is used to cool the first thermoplastic resin film, the fiber reinforcement, the second thermoplastic resin film and the fiber felt after pressurization.

[0017] A take-up roller, located downstream of the cooling device, is used to take up the thermoplastic prepreg sheet.

[0018] In one possible implementation, a drying device is also included, located between the fourth placement member and the heating device, the drying device being used to dry the fiber felt.

[0019] In one possible implementation, it also includes:

[0020] A first guide roller is located between the first placement member and the heating device, and the first guide roller is used to guide the first thermoplastic resin film.

[0021] The second guide roller is located between the third placement member and the heating device, and the second guide roller is used to guide the second thermoplastic resin film.

[0022] The third guide roller is located between the fourth placement member and the heating device, and the third guide roller is used to guide the fiber felt;

[0023] A fourth guide roller is located between the cooling device and the winding roller, and is used to guide the thermoplastic prepreg sheet.

[0024] In one possible implementation, a second pressurizing device is further included, located between the cooling device and the take-up roller, for pressurizing the cooled first thermoplastic resin film, the fiber reinforcement, the second thermoplastic resin film, and the fiber felt.

[0025] In one possible implementation, the first pressurizing device includes two first pressure rollers arranged opposite each other in a first direction.

[0026] In one possible implementation, the heating device includes two heating plates arranged opposite each other in a first direction;

[0027] The heating device includes two cooling plates, which are arranged opposite to each other in the first direction.

[0028] This utility model provides a thermoplastic prepreg sheet and its manufacturing equipment. The thermoplastic prepreg sheet is fitted with a fiber felt, which is connected to a second thermoplastic resin film. The fiber felt covers the second thermoplastic resin film along the thickness direction of the thermoplastic prepreg sheet. The fiber felt of the thermoplastic prepreg sheet is brought into contact with a conveyor belt. After the thermoplastic prepreg sheet is preheated in a tunnel furnace, there is no resin on the side of the fiber felt that is in contact with the conveyor belt. The fiber felt can isolate the sheet body from the conveyor belt, thus preventing the thermoplastic prepreg sheet from sticking to the conveyor belt. This makes it easier to remove the thermoplastic prepreg sheet after passing through the tunnel furnace, thereby improving the production efficiency of battery pack covers.

[0029] During the molding process, the fiber felt of the preheated thermoplastic prepreg sheet has a loose structure, which can play a role in heat insulation. This can prevent the temperature of the preheated thermoplastic prepreg sheet from dropping suddenly when it comes into contact with the mold, which would cause defects such as exposed fibers and missing glue on the product surface.

[0030] During the molding process, the preheated thermoplastic prepreg sheet is pressurized to allow the resin to penetrate the fiber felt, achieving a secondary impregnation effect and ensuring the bonding strength between the sheet and the fiber felt. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A cross-sectional schematic diagram of a thermoplastic prepreg sheet provided for an embodiment of this utility model;

[0033] Figure 2 This is a schematic diagram of a manufacturing equipment for thermoplastic prepreg sheets provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100 - First thermoplastic resin film; 200 - Fiber reinforcement; 300 - Second thermoplastic resin film; 400 - Fiber mat;

[0036] 11-First placement component; 12-Second placement component; 13-Third placement component; 14-Fourth placement component; 20-Heating plate; 31-First pressure roller; 40-Cooling plate; 32-Second pressure roller; 50-Take-up roller; 61-First guide roller; 62-Second guide roller; 63-Third guide roller; 64-Fourth guide roller; 70-Drying device. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," 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, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] As described in the background section, thermoplastic prepreg sheets are difficult to remove after passing through a tunnel furnace, leading to reduced production efficiency of battery pack covers. The inventors discovered that this problem arises because the resin in the thermoplastic prepreg sheets adheres to the conveyor belt after passing through the tunnel furnace, making removal difficult and thus reducing the production efficiency of battery pack covers.

[0043] To address the aforementioned issues, this utility model provides a thermoplastic prepreg sheet and its manufacturing equipment, which incorporates a fiber felt that isolates the sheet body from the conveyor belt. This prevents the thermoplastic prepreg sheet from sticking to the conveyor belt, making it easier to remove the sheet after it passes through the tunnel furnace, thereby improving the production efficiency of the battery pack cover.

[0044] In related technologies, after thermoplastic prepreg sheets pass through a tunnel furnace, the resin of the thermoplastic prepreg sheets will stick to the conveyor belt, making it impossible to use a robotic arm to pick up the material. Only manual material handling can be used, which is time-consuming, labor-intensive, and poses safety hazards for manual operation.

[0045] To address the aforementioned problems, this utility model provides a thermoplastic prepreg sheet and its manufacturing equipment. A fiber felt is incorporated, which isolates the sheet body from the conveyor belt, preventing the thermoplastic prepreg sheet from adhering to the conveyor belt. This allows for material handling using a robotic arm, eliminating the need for manual handling, thus saving time and labor, avoiding safety hazards associated with manual operation, increasing automation, and reducing labor costs.

[0046] The thermoplastic prepreg sheet and its manufacturing equipment provided in this utility model embodiment will be described in detail below with reference to specific embodiments.

[0047] See Figure 1 As shown, this embodiment of the present invention provides a thermoplastic prepreg sheet including a sheet body. In some examples, the thickness direction of the thermoplastic prepreg sheet is the X-axis direction.

[0048] The sheet body includes a fiber reinforcement 200, a first thermoplastic resin film 100, and a second thermoplastic resin film 300. The first thermoplastic resin film 100 and the second thermoplastic resin film 300 are respectively connected to the fiber reinforcement 200 in the thickness direction of the thermoplastic prepreg sheet.

[0049] The fiber reinforcement 200 can be glass fiber or carbon fiber. In some examples, the fibers in the fiber reinforcement 200 can be arranged unidirectionally, that is, the fibers are arranged in one direction, or they can be arranged in a woven manner.

[0050] The material of the first thermoplastic resin film 100 can be polypropylene or polyamide. In some examples, the weight ratio of the first thermoplastic resin film 100 to the fiber reinforcement 200 is greater than or equal to 2 / 5 and less than or equal to 1 / 2. That is, the weight ratio of the first thermoplastic resin film 100 to the fiber reinforcement 200 can be greater than or equal to 2 / 5 and less than or equal to 1 / 2.

[0051] The material of the second thermoplastic resin film 300 may be the same as or different from that of the first thermoplastic resin film 100. In some examples, the material of the second thermoplastic resin film 300 may be polypropylene or polyamide.

[0052] The thermoplastic prepreg sheet also includes fiber mat 400. Fiber mat 400 may be connected to a second thermoplastic resin film 300, which is understood to be connected between fiber mat 400 and fiber reinforcement 200.

[0053] Fiber felt 400 can be glass fiber felt, carbon fiber felt or basalt fiber felt.

[0054] In some examples, a first thermoplastic resin film 100, a fiber reinforcement 200, a second thermoplastic resin film 300, and a fiber mat 400 are sequentially stacked. Then, through heating and pressurization, the first thermoplastic resin film 100 is partially melted in the fiber reinforcement 200, and the second thermoplastic resin film 300 is partially melted in both the fiber reinforcement 200 and the fiber mat 400, thus connecting the first thermoplastic resin film 100, the fiber reinforcement 200, the second thermoplastic resin film 300, and the fiber mat 400 together. It should be noted that the second thermoplastic resin film 300 does not impregnate the fiber mat 400.

[0055] In the thickness direction of the thermoplastic prepreg sheet, a fiber felt 400 covers a second thermoplastic resin film 300. This arrangement brings the fiber felt 400 of the thermoplastic prepreg sheet into contact with the conveyor belt. After the thermoplastic prepreg sheet is preheated in the tunnel furnace, the side of the fiber felt 400 in contact with the conveyor belt may be resin-free. The fiber felt 400 can isolate the sheet body from the conveyor belt, thus preventing the thermoplastic prepreg sheet from sticking to the conveyor belt. This facilitates the removal of the thermoplastic prepreg sheet after passing through the tunnel furnace, thereby improving the production efficiency of the battery pack cover.

[0056] The fiber felt 400 can isolate the sheet body from the conveyor belt, thus preventing the thermoplastic prepreg sheet from sticking to the conveyor belt. This allows for the use of robotic arms to pick up the material instead of manual handling, saving time and labor, avoiding safety hazards associated with manual operation, increasing automation, and reducing labor costs.

[0057] During the molding process, the fiber felt 400 has a loose structure and can act as a heat insulation agent. This can prevent the temperature of the preheated thermoplastic prepreg sheet from dropping sharply when it comes into contact with the mold, which could lead to defects such as exposed fibers and missing glue on the product surface.

[0058] During the molding process, the preheated thermoplastic prepreg sheet is pressurized to allow the resin to penetrate the fiber felt 400, achieving a secondary impregnation effect and ensuring the bonding strength between the sheet body and the fiber felt 400.

[0059] In one possible implementation, the weight ratio of the second thermoplastic resin film 300 to the fiber felt 400 is greater than or equal to 1 / 10 and less than or equal to 1 / 5. That is, the weight ratio of the second thermoplastic resin film 300 to the fiber felt 400 of the thermoplastic prepreg sheet is greater than or equal to 1 / 10 and less than or equal to 1 / 5. For example, the weight ratio of the second thermoplastic resin film 300 to the fiber felt 400 can be 1 / 10, 1 / 9, 1 / 8, 1 / 7, 1 / 6, or 1 / 5. Of course, this ratio can also be other values, and those skilled in the art can select according to their needs; this embodiment does not limit this. When the weight ratio of the second thermoplastic resin film 300 to the fiber felt 400 is less than 1 / 10, the weight of the second thermoplastic resin film 300 is too small, which may lead to unstable bonding between the fiber felt 400 and the second thermoplastic resin film 300. When the weight ratio of the second thermoplastic resin film 300 to the fiber felt 400 is greater than 1 / 5, the weight of the second thermoplastic resin film 300 is too large, and it is easy for the second thermoplastic resin film 300 to completely permeate the fiber felt 400, resulting in a narrow process window and failing to achieve a semi-impregnation effect. By limiting the weight ratio of the second thermoplastic resin film 300 to the fiber felt 400, unstable bonding between the fiber felt 400 and the second thermoplastic resin film 300 can be avoided, while simultaneously achieving a semi-impregnation effect.

[0060] In one possible implementation, the basis weight of the fiber felt 400 is greater than or equal to 20 g / m². 2 And less than or equal to 100g / m 2 For example, the weight of fiber felt 400 can be 20 g / m². 2 30g / m 2 40g / m 2 50g / m 2 60g / m 2 70g / m 2 8g / m 2 90g / m 2 Or 100g / m 2 When the basis weight of fiber felt 400 is less than 20 g / m² 2 When the fiber felt 400 is too thin, the second thermoplastic resin film 300 easily penetrates the fiber felt 400 completely during the preheating of the thermoplastic prepreg sheet in the tunnel furnace, causing the thermoplastic prepreg sheet to stick to the conveyor belt. When the basis weight of the fiber felt 400 is greater than 100 g / m²... 2If the fiber felt 400 is too thick, the second thermoplastic resin film 300 cannot penetrate it during the molding process, failing to achieve a secondary impregnation effect and resulting in dry spots on the product. By limiting the basis weight of the fiber felt 400, it is possible to prevent the second thermoplastic resin film 300 from easily and completely penetrating the fiber felt 400 when the thermoplastic prepreg sheet is preheated in the tunnel furnace, thus avoiding adhesion between the thermoplastic prepreg sheet and the conveyor belt. Simultaneously, during the molding process, the second thermoplastic resin film 300 can penetrate the fiber felt 400, achieving a secondary impregnation effect.

[0061] See Figure 2 As shown, this utility model embodiment provides a manufacturing equipment for thermoplastic prepreg sheets, which is applied to the aforementioned thermoplastic prepreg sheets.

[0062] Equipment for manufacturing thermoplastic prepreg sheets includes placement components.

[0063] The placement assembly includes a first placement member 11, a second placement member 12, a third placement member 13, and a fourth placement member 14. The first placement member 11 is used to provide a first thermoplastic resin film 100, the second placement member 12 is used to provide a fiber reinforcement 200, the third placement member 13 is used to provide a second thermoplastic resin film 300, and the fourth placement member 14 is used to provide a fiber felt 400.

[0064] In some examples, the first placement member 11 may be a first placement roller. The first thermoplastic resin film 100 can be formed from thermoplastic resin by blow molding or roll extrusion, and the formed first thermoplastic resin film 100 is wound onto the first placement roller.

[0065] In some examples, when the fibers in the fiber reinforcement 200 are arranged in a unidirectional manner, the second placement member 12 can be a yarn frame on which the fiber reinforcement 200 is wound. In other embodiments, when the fibers in the fiber reinforcement 200 are arranged in a woven manner, the second placement member 12 can be a second placement roller on which the fiber reinforcement 200 is wound.

[0066] In some examples, the third placement member 13 can be a third placement roller. When the material of the second thermoplastic resin film 300 is different from that of the first thermoplastic resin film 100, the second thermoplastic resin film 300 can be formed by blow molding or roller extrusion, and the formed second thermoplastic resin film 300 can be wound onto the third placement roller. It should be noted that in other embodiments, when the material of the second thermoplastic resin film 300 is the same as that of the first thermoplastic resin film 100, the manufacturing equipment for the thermoplastic prepreg sheet may not need to be equipped with a third placement member. During the manufacturing process of the thermoplastic prepreg sheet, the second thermoplastic resin film 300 can be formed by melting the first thermoplastic resin film 100 onto the fiber reinforcement 200.

[0067] In some examples, the fourth placement member 14 may be a fourth placement roller. Fiber felt 400 is wound onto the fourth placement roller.

[0068] The equipment for manufacturing thermoplastic prepreg sheets includes a heating device. The heating device is located downstream of the placement assembly and is used to heat the first thermoplastic resin film 100, the fiber reinforcement 200, the second thermoplastic resin film 300, and the fiber mat 400 that are stacked sequentially.

[0069] In some examples, the heating device includes two heating plates 20, which are arranged opposite each other in a first direction. The first direction can be the Y-axis. A first thermoplastic resin film 100, a fiber reinforcement 200, a second thermoplastic resin film 300, and a fiber mat 400, which are stacked sequentially, can be located between the two heating plates 20, and the two heating plates 20 can heat the sequentially stacked first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber mat 400.

[0070] The equipment for manufacturing thermoplastic prepreg sheets includes a first pressurizing device. The first pressurizing device is located downstream of the heating device and is used to pressurize the heated first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber mat 400.

[0071] In some examples, the first pressurizing device includes two first pressure rollers 31 arranged opposite each other in a first direction. The heated first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber felt 400 are located between the two first pressure rollers 31, which can pressurize the heated first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber felt 400.

[0072] The equipment for manufacturing thermoplastic prepreg sheets includes a cooling device. The cooling device is located downstream of the first pressurizing device and is used to cool the pressurized first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber mat 400.

[0073] In some examples, the cooling device includes two cooling plates 40 arranged opposite each other in a first direction. The first direction can be the Y-axis direction. The pressurized first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber felt 400 can be located between the two cooling plates 40, which can cool the pressurized first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber felt 400.

[0074] The equipment for manufacturing thermoplastic prepreg sheets includes a take-up roller 50. The take-up roller 50 is located downstream of the cooling unit and is used to take up the thermoplastic prepreg sheet.

[0075] In one possible implementation, the manufacturing equipment for the thermoplastic prepreg sheet further includes a drying device 70 located between the fourth placement member 14 and the heating device. The drying device 70 is used to dry the fiber felt 400. The drying device 70 can remove surface moisture and some sizing agent from the fiber felt 400, ensuring the bonding strength between the second thermoplastic resin film 300 and the fiber felt 400.

[0076] In some examples, the drying device 70 can be a hot air dryer.

[0077] In one possible implementation, the manufacturing equipment for the thermoplastic prepreg sheet further includes a first guide roller 61 located between the first placement member 11 and the heating device. The first guide roller 61 is used to guide the first thermoplastic resin film 100. The first guide roller 61 can be used to stack the first thermoplastic resin film 100 on one side of the fiber reinforcement 200 in the +Y axis direction.

[0078] The equipment for manufacturing thermoplastic prepreg sheets also includes a second guide roller 62, which is located between the third placement member 13 and the heating device. The second guide roller 62 is used to guide the second thermoplastic resin film 300. The second thermoplastic resin film 300 can be stacked on one side of the fiber reinforcement 200 in the Y-axis direction by means of the second guide roller 62.

[0079] The thermoplastic prepreg sheet manufacturing equipment also includes a third guide roller 63, which is located between the fourth placement member 14 and the heating device. The third guide roller 63 is used to guide the fiber felt 400. The fiber felt 400 can be stacked on one side of the second thermoplastic resin film 300 in the Y-axis direction by means of the third guide roller 63.

[0080] The manufacturing equipment for thermoplastic prepreg sheets also includes a fourth guide roller 64, located between the cooling device and the take-up roller 50. The fourth guide roller 64 is used to guide the thermoplastic prepreg sheet. The thermoplastic prepreg sheet can be driven to the take-up roller 50 by the fourth guide roller 64.

[0081] In one possible implementation, the manufacturing equipment for the thermoplastic prepreg sheet further includes a second pressing device located between the cooling device and the winding roller 50. The second pressing device is used to pressurize the cooled first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300 and fiber felt 400 to form a thermoplastic prepreg sheet.

[0082] In some examples, the second pressurizing device includes two second pressure rollers 32 arranged opposite each other in a first direction. The cooled first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber felt 400 are located between the two second pressure rollers 32, which can pressurize the cooled first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300, and fiber felt 400.

[0083] This utility model provides a method for manufacturing thermoplastic prepreg sheets, comprising the following steps:

[0084] S100, providing a first thermoplastic resin film 100, a fiber reinforcement 200, a second thermoplastic resin film 300 and a fiber mat 400 arranged in sequence.

[0085] The first placement component 11 of the thermoplastic prepreg sheet manufacturing equipment can provide a first thermoplastic resin film 100, the second placement component 12 can provide a fiber reinforcement 200, the third placement component 13 can provide a second thermoplastic resin film 300, and the fourth placement component 14 can provide a fiber felt 400.

[0086] The material of the first thermoplastic resin film 100 is different from that of the second thermoplastic resin film 300.

[0087] S200, the first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300 and fiber felt 400, which are stacked in sequence, are passed through a heating device.

[0088] The first thermoplastic resin film 100, the fiber reinforcement 200, the second thermoplastic resin film 300 and the fiber felt 400, which are stacked in sequence, are passed through two heating plates 20 of the heating device.

[0089] The temperature of the heating plate 20 located on the +Y axis side is greater than the melting point of the first thermoplastic resin film 100. The difference between the temperature of the heating plate 20 located on the +Y axis side and the melting point of the first thermoplastic resin film 100 can be greater than 5°C and less than or equal to 10°C.

[0090] The temperature of the heating plate 20 located on the -Y axis side is greater than the melting point of the second thermoplastic resin film 300. The difference between the temperature of the heating plate 20 located on the -Y axis side and the melting point of the second thermoplastic resin film 300 can be greater than 0℃ and less than or equal to 5℃.

[0091] In other embodiments, when the material of the first thermoplastic resin film 100 is different from that of the second thermoplastic resin film 300, the first thermoplastic resin film 100, the fiber reinforcement 200, and the fiber felt 400, which are stacked sequentially, are passed through two heating plates 20 of the heating device. The temperature of the heating plate 20 located on the +Y axis side is greater than the melting point of the first thermoplastic resin film 100. The difference between the temperature of the heating plate 20 located on the +Y axis side and the melting point of the first thermoplastic resin film 100 can be greater than 20°C and less than or equal to 30°C. The temperature of the heating plate 20 located on the -Y axis side is less than the melting point of the first thermoplastic resin film 100. The difference between the melting point of the first thermoplastic resin film 100 and the temperature of the heating plate 20 located on the -Y axis side can be greater than 50°C and less than or equal to 10°C. The first thermoplastic resin film 100 can permeate the fiber reinforcement 200, but the first thermoplastic resin film 100 will not permeate the fiber felt 400. The portion between the fiber reinforcement 200 and the fiber felt 400 can serve as the second thermoplastic resin film 300.

[0092] S300: After the heated first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300 and fiber felt 400 are sequentially passed through the first pressurizing device, the cooling device and the second pressurizing device, a thermoplastic prepreg sheet can be formed.

[0093] The heated first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300 and fiber felt 400 are pressurized by two first pressure rollers 31 of the first pressure device.

[0094] The pressurized first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300 and fiber felt 400 are cooled by two cooling plates 40 of the cooling device.

[0095] The cooled first thermoplastic resin film 100, fiber reinforcement 200, second thermoplastic resin film 300 and fiber felt 400 are pressed by two second pressure rollers 32 of the second pressure device to form a thermoplastic prepreg sheet.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A thermoplastic prepreg sheet, characterized in that, include: The sheet body includes a fiber reinforcement (200), a first thermoplastic resin film (100), and a second thermoplastic resin film (300), wherein the first thermoplastic resin film (100) and the second thermoplastic resin film (300) are respectively connected to the fiber reinforcement (200) in the thickness direction of the thermoplastic prepreg sheet. A fiber felt (400) is connected to the second thermoplastic resin film (300), and the fiber felt (400) covers the second thermoplastic resin film (300) in the thickness direction of the thermoplastic prepreg sheet.

2. The thermoplastic prepreg sheet according to claim 1, characterized in that, The weight ratio of the second thermoplastic resin film (300) to the fiber felt (400) is greater than or equal to 1 / 10 and less than or equal to 1 / 5.

3. The thermoplastic prepreg sheet according to claim 1, characterized in that, The weight ratio of the first thermoplastic resin film (100) to the fiber reinforcement (200) is greater than or equal to 2 / 5 and less than or equal to 1 / 2.

4. The thermoplastic prepreg sheet according to any one of claims 1-3, characterized in that, The basis weight of the fiber felt (400) is greater than or equal to 20 g / m². 2 And less than or equal to 100g / m 2 .

5. A manufacturing apparatus for thermoplastic prepreg sheets, applied to the thermoplastic prepreg sheets as described in any one of claims 1-4, characterized in that, include: The placement assembly includes a first placement member (11), a second placement member (12), a third placement member (13), and a fourth placement member (14), wherein the first placement member (11) is used to provide a first thermoplastic resin film (100), the second placement member (12) is used to provide a fiber reinforcement (200), the third placement member (13) is used to provide a second thermoplastic resin film (300), and the fourth placement member (14) is used to provide a fiber felt (400); A heating device is located downstream of the placement assembly. The heating device is used to heat the first thermoplastic resin film (100), the fiber reinforcement (200), the second thermoplastic resin film (300) and the fiber felt (400) that are stacked in sequence. The first pressurizing device is located downstream of the heating device and is used to pressurize the heated first thermoplastic resin film (100), the fiber reinforcement (200), the second thermoplastic resin film (300), and the fiber felt (400). A cooling device is located downstream of the first pressurizing device. The cooling device is used to cool the first thermoplastic resin film (100), the fiber reinforcement (200), the second thermoplastic resin film (300), and the fiber felt (400) after pressurization. A take-up roller (50), located downstream of the cooling device, is used to take up the thermoplastic prepreg sheet.

6. The equipment for manufacturing thermoplastic prepreg sheets according to claim 5, characterized in that, It also includes a drying device (70) located between the fourth placement member (14) and the heating device, the drying device (70) being used to dry the fiber felt (400).

7. The equipment for manufacturing thermoplastic prepreg sheets according to claim 5, characterized in that, Also includes: A first guide roller (61) is located between the first placement member (11) and the heating device, and the first guide roller (61) is used to guide the first thermoplastic resin film (100); The second guide roller (62) is located between the third placement member (13) and the heating device, and the second guide roller (62) is used to guide the second thermoplastic resin film (300); The third guide roller (63) is located between the fourth placement member (14) and the heating device, and the third guide roller (63) is used to guide the fiber felt (400); A fourth guide roller (64) is located between the cooling device and the winding roller (50) and is used to guide the thermoplastic prepreg sheet.

8. The equipment for manufacturing thermoplastic prepreg sheets according to any one of claims 5-7, characterized in that, It also includes a second pressurizing device located between the cooling device and the take-up roller (50), the second pressurizing device being used to pressurize the cooled first thermoplastic resin film (100), the fiber reinforcement (200), the second thermoplastic resin film (300) and the fiber felt (400).

9. The equipment for manufacturing thermoplastic prepreg sheets according to claim 8, characterized in that, The first pressurizing device includes two first pressure rollers (31) arranged opposite to each other in a first direction.

10. The equipment for manufacturing thermoplastic prepreg sheets according to any one of claims 5-7, characterized in that, The heating device includes two heating plates (20) arranged opposite each other in a first direction; The heating device includes two cooling plates (40) arranged opposite each other in the first direction.

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