Long-fiber PET element processing technology suitable for vehicle body part and vehicle element

Abstract

The invention provides a long-fiber PET element processing technology suitable for a vehicle body part and a vehicle element. The technology comprises the steps that a double-layer long-fiber PET material with the skin melting point lower than that of a core layer is prepared firstly, the double-layer long-fiber PET material enters a mold to be preheated and then is heated through high-pressure steam, the temperature is controlled to be between the skin melting point and the core layer melting point, the skin is molten to be bonded with the core layer, the mold is filled with the mold, pressure maintaining is conducted, and a semi-finished product is obtained; and cooling, shaping and punching to obtain a target element. According to the process, stable forming of the long-fiber PET material can be achieved, the prepared element is high in strength, low in water absorption rate and recyclable, the requirements of main engine plants for high performance, high reliability and environmental compliance of automobile body parts are met, the development trend of automobile light weight and green circulation is met, the production cost and environmental protection pressure are reduced, application of long-fiber PET in the field of automobiles is widened, and the application prospect is wide. The method has outstanding technical and industrial values.

Description

Technical Field

[0001] This invention relates to the field of automotive component processing technology, specifically to a long-fiber PET component processing technology applicable to vehicle body parts and automotive components. Background Technology

[0002] With the continuous advancement of automotive technology and the increasing demands of consumers for vehicle performance, lightweighting, NVH (noise, vibration, and harshness), recyclability, circularity, and environmental protection have become important development trends in the automotive manufacturing industry.

[0003] In the manufacturing of car body parts such as underbody protection panels, thermoplastic materials are widely used due to their advantages such as convenient molding and controllable cost. At present, the industry mainly uses traditional thermoplastic materials such as PP-glass fiber (glass fiber reinforced polypropylene), short fiber PET, and LWRT (lightweight reinforced thermoplastic) for production. Among them, LWRT material has been used in underbody protection panels of some joint venture models due to its lightweight characteristics, but it has not yet solved the inherent defects of traditional materials.

[0004] The aforementioned traditional thermoplastic materials have many drawbacks in practical applications, making it difficult to meet the current high-performance and environmental protection requirements of OEMs for automotive components. Their water resistance is poor; traditional materials such as LWRT have high water absorption rates, with a maximum 24-hour water absorption rate exceeding 50%. Under water-crossing conditions, they easily absorb water and increase weight, not only increasing vehicle energy consumption but also potentially causing component cracking and failure. This makes it difficult to meet the water-crossing test standards stipulated by OEMs and unable to adapt to complex driving environments. Furthermore, their mechanical strength is insufficient. The structural characteristics of materials such as PP-glass fiber, short-fiber PET, and LWRT limit their reinforcing effects. Short-fiber PET, with its shorter fiber length, has a less significant reinforcing effect, while LWRT, due to its weak inter-fiber bonding and significant differences in mechanical properties in the longitudinal and transverse directions, results in poor overall component strength and tear resistance. Its performance is relatively low, making it difficult to meet the mechanical performance requirements of OEMs for components such as underbody protection plates, and it cannot effectively resist external forces such as stone impacts during driving. In addition, its NVH performance is poor. The sound absorption, sound insulation and vibration reduction performance of traditional thermoplastic materials are limited, making it difficult to effectively block the noise and vibration generated during vehicle operation. It cannot meet consumers' demand for quietness in the car, nor can it meet the OEM's acceptance standards for NVH performance, affecting the overall driving comfort of the vehicle. Moreover, it is not environmentally friendly and is not recyclable. Traditional materials such as PP-glass fiber are prone to fiber breakage and matrix degradation during recycling, resulting in a significant decline in performance after recycling. In practical applications, it is difficult to achieve effective recycling and reuse, which is inconsistent with the environmentally friendly and recyclable development trend of the automotive industry and cannot meet the increasingly stringent environmental regulations.

[0005] Long-fiber PET materials possess advantages such as high strength, low water absorption, and recyclability, which theoretically can effectively solve the defects of the aforementioned traditional materials. However, due to their unique structure and complex molding process, they have long been difficult to apply on a large scale in components such as automotive underbody panels, becoming a key bottleneck restricting their promotion in the automotive field. Therefore, developing a technical solution that can apply long-fiber PET materials to components such as automotive underbody panels has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem that long fiber PET materials are difficult to apply to the processing of automotive components in the prior art, and to provide a long fiber PET component processing technology and automotive components suitable for body parts.

[0007] To solve the above-mentioned technical problems, the present invention provides a processing technology for long-fiber PET components suitable for vehicle body parts, comprising: Step S1, preparing long-fiber PET material, the long-fiber PET material including a skin and a core layer, the skin wrapping the outer surface of the core layer, wherein the melting point of the skin is lower than the melting point of the core layer; Step S2, placing the long-fiber PET material into a mold, and then preheating the mold and the long-fiber PET material inside it; Step S3, subjecting the preheated mold and the long-fiber PET material inside it to high-pressure steam heating, maintaining the temperature between the melting point of the skin and the melting point of the core layer during the process, so that the skin melts, the melted skin adheres to the core layer and fills the mold, and after pressure holding, a long-fiber semi-finished product is obtained; Step S4, removing the long-fiber semi-finished product from the mold and cooling and shaping it; Step S5, punching the cooled and shaped long-fiber semi-finished product until a long-fiber PET component of the target shape is obtained.

[0008] In one embodiment of the present invention, in step S1, the melting point of the outer skin substrate is 215~225°C, the melting point of the core layer substrate is 245~255°C, and the mass of the outer skin accounts for 25~35% of the mass of the long fiber PET material.

[0009] In one embodiment of the present invention, in step S2, the preheating temperature is 160~200℃.

[0010] In one embodiment of the present invention, in step S3, the steam pressure of the high-pressure steam heating is 16~18 bar, and the steam duration is 6~12 s.

[0011] In one embodiment of the present invention, step S4 specifically involves: taking the long fiber semi-finished product out of the mold and placing it in a cooling and shaping fixture to cool for 30 to 60 seconds.

[0012] In one embodiment of the present invention, in step S5, the punching and holding pressure is 250~300T and the holding time is 50~60 seconds.

[0013] In one embodiment of the present invention, the processing technology of the long fiber PET element suitable for vehicle body parts further includes step S6, performing performance testing on the long fiber PET element of the target shape, wherein the performance testing includes at least one of water wading performance testing, mechanical performance testing and lightweight testing, wherein the mechanical performance testing includes pull-out force testing, tensile force testing and tear force testing.

[0014] In one embodiment of the present invention, the long fiber PET element processing technology applicable to vehicle body parts further includes step S7, repeating steps S1 to S6 to prepare multiple long fiber PET elements with different target shapes that have passed performance testing, and then assembling the multiple long fiber PET elements together through connectors to obtain a long fiber PET element assembly.

[0015] In one embodiment of the present invention, the long fiber PET element processing technology applicable to vehicle body parts further includes step S8, repeating step S7 until multiple long fiber PET element assemblies are obtained, and then the multiple long fiber PET element assemblies are packed into boxes and stored in a warehouse in batches.

[0016] The present invention also provides an automotive component, which is prepared by the above-described long-fiber PET component processing technology suitable for vehicle body parts.

[0017] The technical solution of the present invention has the following advantages compared with the prior art: The long-fiber PET element processing technology for automotive body parts described in this invention utilizes a rationally designed double-layer structure of the long-fiber PET material, consisting of a skin and a core layer. By taking advantage of the lower melting point of the skin compared to the core layer, and employing a step-by-step heating method combining preheating and high-pressure steam heating, the heating temperature is precisely controlled between the melting points of the skin and the core layer. This allows the skin to fully melt during heating while the core layer maintains its original structural shape. The melted skin not only effectively bonds to the core layer, ensuring the overall density and stability of the material structure, but also completely fills the mold cavity, guaranteeing that the molded long-fiber semi-finished product has a regular shape and accurate dimensions. This effectively solves the technical challenges of the high difficulty in molding long-fiber PET materials and the susceptibility to molding defects, enabling the large-scale and standardized processing of long-fiber PET materials in automotive body parts.

[0018] Subsequent cooling, shaping, and punching processes further ensured the dimensional accuracy and appearance quality of the target long-fiber PET components. This enabled the processed long-fiber PET components to perfectly adapt to the installation requirements of vehicle body parts such as underbody panels. Thanks to the high strength and low water absorption of the long-fiber PET material itself, it effectively improved the mechanical properties and water wading performance of the body parts. At the same time, it significantly optimized the NVH performance of the parts, effectively resisting external impacts during driving, preventing weight gain and cracking after water wading, reducing noise and vibration transmission inside the vehicle, and improving the overall driving comfort.

[0019] Furthermore, long-fiber PET materials are recyclable and reusable. This process does not introduce any harmful additives, and the processing is environmentally friendly and controllable. The long-fiber PET components produced can be effectively recycled and reused, which is in line with the automotive industry's development trend of lightweighting, environmental protection, and recyclability. It can meet the OEM's requirements for high performance, high reliability, and environmental compliance of body parts, reduce the production cost and environmental pressure of body parts, and at the same time broaden the application scope of long-fiber PET materials in the automotive field, with significant technical advantages and industrial application value. Attached Figure Description

[0020] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a flowchart of the long-fiber PET element processing technology applicable to vehicle body parts in a preferred embodiment of the present invention; Figure 2 This is a water wading performance test diagram of an automotive component in another embodiment of the present invention; Figure 3 yes Figure 2 Test diagram of horizontal pull-out force performance of components used in CRRC; Figure 4 yes Figure 2 Test diagram of vertical pull-out force performance of components used in CRRC; Figure 5 yes Figure 2 Test diagram of tensile strength properties of components used in CRRC; Figure 6 yes Figure 2 Tear strength performance test diagram for components used in CRRC. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0023] Example 1: See Figure 1As shown, this embodiment provides a processing technology for long-fiber PET components suitable for vehicle body parts, which includes: Step S1: Prepare long-fiber PET material, which includes a skin and a core layer. The skin wraps around the outer surface of the core layer, and the melting point of the skin is lower than that of the core layer. Step S1 provides a suitable basic raw material for subsequent processing. By designing a double-layer structure of skin and core layer, and ensuring that the melting point of the skin is lower than that of the core layer, a structural foundation is laid for subsequent step-by-step heating and precise molding. The skin serves as the bonding and filling medium in the subsequent molding process, while the core layer serves as the main structure of the component, ensuring the core performance such as the mechanical strength of the final long-fiber PET component. At the same time, this double-layer structure design solves the problems of high molding difficulty and insufficient structural stability of long-fiber PET material from the source, ensuring that the material can adapt to the needs of subsequent processing technology and the use of body parts.

[0024] Specifically, in this embodiment, the melting point of the outer skin substrate is 220°C, the melting point of the core layer substrate is 250°C, and the outer skin mass accounts for 30% of the mass of the long-fiber PET material. This parameter design ensures a reasonable melting point difference between the outer skin and the core layer, providing a reliable guarantee for precise control of the heating temperature in subsequent steps, achieving skin melting while maintaining structural stability of the core layer. Simultaneously, the reasonable outer skin mass ratio balances the material's adhesion, molding performance, and overall mechanical strength, adapting to the processing and usage requirements of automotive body parts. In different embodiments, the melting point of the outer skin substrate can be set to 215~225°C, the melting point of the core layer substrate can be set to 245~255°C, or the outer skin mass can be adjusted to 25~35% of the mass of the long-fiber PET material, depending on actual usage requirements. This invention does not impose specific limitations in this regard.

[0025] Step S2: Place the long-fiber PET material into the mold, and then preheat the mold and the long-fiber PET material inside it. Step S2 is used to preheat the mold and the long-fiber PET material. On the one hand, it can eliminate the temperature difference between the mold and the long-fiber PET material, and avoid molding defects such as thermal stress and cracking caused by sudden temperature changes during subsequent high-pressure steam heating. On the other hand, it can raise the temperature of the long-fiber PET material in advance, which lays the groundwork for rapid heating and uniform heating in the subsequent high-pressure steam heating stage, shortens the overall processing cycle, and reduces uneven heating of the material during the heating process, ensuring the subsequent molding quality.

[0026] Furthermore, the preheating temperature in this embodiment is 160~200℃. Within this temperature range, the mold and long-fiber PET material can be heated evenly, eliminating the internal and external temperature difference to avoid thermal stress and molding defects during subsequent heating. At the same time, it improves the plasticity of the material, shortens the subsequent high-pressure steam heating cycle, and ensures molding stability.

[0027] Step S3: High-pressure steam heating is applied to the preheated mold and the long-fiber PET material inside it. During this process, the temperature is maintained between the melting point of the outer skin and the melting point of the core layer to melt the outer skin. The molten outer skin then adheres to the core layer and fills the mold. After pressure holding, a long-fiber semi-finished product is obtained. Its function is to achieve the molding of long-fiber PET material through high-pressure steam heating, and to precisely control the heating temperature between the melting point of the outer skin and the melting point of the core layer. This ensures that the outer skin is fully melted, and the molten outer skin is used to achieve tight bonding of the various parts of the core layer, ensuring the density and integrity of the overall material structure. At the same time, it avoids structural damage and degradation of mechanical properties caused by the melting of the core layer. Simultaneously, the molten outer skin can completely fill the mold cavity, ensuring that the shape of the molded long-fiber semi-finished product matches the mold and the dimensions are accurate. The pressure holding operation further consolidates the molding effect and prevents problems such as shrinkage and deformation of the semi-finished product, ultimately obtaining a long-fiber semi-finished product that meets the requirements of subsequent processing.

[0028] Specifically, in this embodiment, the high-pressure steam heating uses a steam pressure of 17 bar and a steam duration of 10 seconds. In different implementations, the high-pressure steam heating can be configured to a steam pressure of 16-18 bar and a steam duration of 6-12 seconds, depending on the actual processing requirements. This precise and flexible configuration of pressure and time parameters ensures rapid and uniform melting of the skin within the temperature range between the skin's melting point and the core's melting point. This guarantees effective adhesion of the molten skin to the core and full filling of the mold cavity, improving the density and dimensional accuracy of the semi-finished product. It also avoids problems such as core damage due to improper pressure or time, overheating of the material, or insufficient molding, thus balancing molding quality, processing efficiency, and process stability.

[0029] Step S4: After removing the long fiber semi-finished product from the mold, it is cooled and shaped. The cooling process allows the molten outer skin to solidify quickly, fixing the shape and size of the long fiber semi-finished product. This prevents it from deforming or collapsing due to excessive temperature after being removed from the mold. At the same time, it further enhances the bonding strength between the outer skin and the core layer, improves the structural stability and mechanical properties of the semi-finished product, and provides a stable and qualified processing substrate for subsequent punching steps, ensuring the smooth progress of the punching process.

[0030] Further, step S4 in this embodiment specifically involves: removing the long fiber semi-finished product from the mold and placing it in a cooling and shaping fixture for 50 seconds. In different embodiments, the cooling temperature can be configured as a room temperature environment of 10~30℃, and the cooling time can be configured as 30~60 seconds. The above parameter range allows the molten skin to solidify quickly and uniformly, stabilizing the size and shape of the semi-finished product, preventing springback deformation, and simultaneously improving the bonding strength between the skin and the core layer and the overall structural rigidity, providing a processing substrate with stable shape and reliable mechanical properties for subsequent punching processes.

[0031] Step S5: Punch the cooled and shaped long fiber semi-finished product until the target shape of the long fiber PET element is obtained. This process involves precisely punching the cooled and shaped long fiber semi-finished product to remove excess parts, burrs and non-compliant areas from the edges of the semi-finished product, and processing it into a target shape and size that matches the automotive body parts (such as the underbody protection plate). This ensures that the final long fiber PET element can accurately fit the vehicle body installation requirements, while ensuring the appearance quality and dimensional accuracy of the element, and meeting the OEM's installation and performance acceptance standards for vehicle body parts.

[0032] Furthermore, in this embodiment, the punching and holding pressure is 280T, and the holding time is 55 seconds. In different embodiments, the punching and holding pressure can be configured to 250~300T, and the holding time can be configured to 50~60 seconds. The above process can ensure that the component cross-section is flat, burr-free, and tear-free during the punching and forming process. At the same time, by holding the pressure sufficiently, internal stress is further eliminated, the final size and shape are stabilized, and the long-fiber PET component achieves the precision and appearance quality required for the car body parts.

[0033] The above process, through step-by-step temperature control and precise molding, enables the stable fabrication of automotive components from long-fiber PET material: Step S1 prepares a double-layer long-fiber PET material with a skin melting point of 215~225℃, a core melting point of 245~255℃, and a skin mass ratio of 25~35%, providing a high-strength, low-water-absorption, and recyclable material base for automotive components; Step S2 preheats the mold and material at 160~200℃ to eliminate temperature differences, improve plasticity, and avoid thermal stress and defects during the molding of automotive components; Step S3 uses 16~18 bar high-pressure steam heating for 6~12 seconds (typically 17 bar, 10 seconds), controlling the temperature between the skin and core melting points, so that the skin melts and bonds to the core layer and fills the mold, ensuring that the automotive components have a dense structure, accurate dimensions, and meet mechanical performance standards; Step S4 involves shaping the component in a 30-80℃ cooling fixture for 30-60 seconds to quickly solidify and prevent deformation, ensuring the dimensional stability and rigidity of the automotive component to meet vehicle installation requirements. Step S5 involves punching and holding the material at 250~300T for 50~60 seconds to obtain automotive components with a smooth cross-section, no burrs, and qualified precision. This process achieves efficient and stable preparation of long-fiber PET automotive components, giving them excellent mechanical, water-resistant, NVH, and environmental performance, making them suitable for the installation and use of automotive body parts such as underbody panels.

[0034] Based on this, the processing technology for long-fiber PET components suitable for vehicle body parts further includes step S6, which involves performance testing of the target-shaped long-fiber PET component. The performance testing includes at least one of water wading performance testing, mechanical performance testing, and lightweight testing. The mechanical performance testing includes pull-out force testing, tensile force testing, and tear force testing. This ensures that the product performance meets the OEM standards and vehicle operating conditions, providing a reliable quality judgment basis for the mass production and vehicle application of the component.

[0035] The processing technology for long-fiber PET elements suitable for vehicle body parts further includes step S7 and repeating step S6 to prepare multiple long-fiber PET elements of different target shapes that have passed performance testing. Then, the multiple long-fiber PET elements are assembled with connectors to obtain a long-fiber PET element assembly.

[0036] In other embodiments, the long-fiber PET element processing technology applicable to vehicle body parts can also include step S8 and repeating step S7 until multiple long-fiber PET element assemblies are obtained. Then, the multiple long-fiber PET element assemblies are packed into boxes and stored in the warehouse in batches. This enables large-scale continuous production and standardized warehouse management of products, improves production efficiency and shipping consistency, and ensures the batch supply of automotive body parts and subsequent assembly and use needs.

[0037] Example 2: This example provides an automotive component, which is prepared using the long-fiber PET component processing technology applicable to vehicle body parts described in Example 1.

[0038] Figure 2 The wading performance of this automotive component at different depths was demonstrated, showing that it has good wading performance at depths of 50-500mm.

[0039] Figures 3-6 The horizontal pull-out force, vertical pull-out force, tensile force, and tear force of automotive components and lightweight reinforced thermoplastic (LWRT) are compared. It can be seen that the elongation at break of LWRT material is about 1-2 mm, and the maximum breaking force can reach 900 N. The elongation at break of automotive components made of continuous fiber PET material can reach more than 30 mm, and the maximum breaking force can reach more than 1100 N. The shaded area under the load-displacement curve represents the energy required for material failure. The failure energy of continuous fiber PET is significantly higher. Therefore, the long fiber automotive components shown in this application have better performance.

[0040] In summary, the long-fiber PET element processing technology for automotive body parts described in this invention, through the rational design of the double-layer structure of the long-fiber PET material (skin and core), utilizes the characteristic that the skin's melting point is lower than the core's melting point. Combined with a step-by-step heating method involving preheating and high-pressure steam heating, the heating temperature is precisely controlled between the skin and core's melting points. This allows the skin to fully melt during heating while the core maintains its original structural shape. The melted skin not only effectively bonds to the core, ensuring the overall density and stability of the material's structure, but also completely fills the mold cavity, guaranteeing that the molded long-fiber semi-finished product has a regular shape and precise dimensions. This effectively solves the technical problems of high molding difficulty and susceptibility to molding defects in long-fiber PET materials, enabling large-scale, standardized processing of long-fiber PET materials in automotive body parts.

[0041] Subsequent cooling, shaping, and punching processes further ensured the dimensional accuracy and appearance quality of the target long-fiber PET components. This enabled the processed long-fiber PET components to perfectly adapt to the installation requirements of vehicle body parts such as underbody panels. Thanks to the high strength and low water absorption of the long-fiber PET material itself, it effectively improved the mechanical properties and water wading performance of the body parts. At the same time, it significantly optimized the NVH performance of the parts, effectively resisting external impacts during driving, preventing weight gain and cracking after water wading, reducing noise and vibration transmission inside the vehicle, and improving the overall driving comfort.

[0042] Furthermore, long-fiber PET materials are recyclable and reusable. This process does not introduce any harmful additives, and the processing is environmentally friendly and controllable. The long-fiber PET components produced can be effectively recycled and reused, which is in line with the automotive industry's development trend of lightweighting, environmental protection, and recyclability. It can meet the OEM's requirements for high performance, high reliability, and environmental compliance of body parts, reduce the production cost and environmental pressure of body parts, and at the same time broaden the application scope of long-fiber PET materials in the automotive field, with significant technical advantages and industrial application value.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A processing technology for long-fiber PET components suitable for vehicle body parts, characterized in that: include: Step S1: Prepare long-fiber PET material, which includes a skin and a core layer. The skin is wrapped around the outer surface of the core layer, wherein the melting point of the skin is lower than that of the core layer. Step S2: Place the long-fiber PET material into the mold, and then preheat the mold and the long-fiber PET material inside it; Step S3: High-pressure steam heating is applied to the preheated mold and the long-fiber PET material inside it. During this process, the temperature is maintained between the melting point of the outer skin and the melting point of the core layer so that the outer skin melts. The melted outer skin adheres to the core layer and fills the mold. After pressure holding, a long-fiber semi-finished product is obtained. Step S4: After removing the long fiber semi-finished product from the mold, it is cooled and shaped. Step S5: Punch the cooled and shaped long fiber semi-finished product until the target shape of the long fiber PET element is obtained.

2. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 1, characterized in that: In step S1, the outer skin substrate has a melting point of 215~225℃, the core layer substrate has a melting point of 245~255℃, and the outer skin accounts for 25~35% of the mass of the long fiber PET material.

3. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 1, characterized in that: In step S2, the preheating temperature is 160~200℃.

4. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 1, characterized in that: In step S3, the steam pressure for high-pressure steam heating is 16~18 bar, and the steam duration is 6~12 s.

5. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 1, characterized in that: Step S4 specifically involves taking the long fiber semi-finished product out of the mold and placing it in a cooling and shaping fixture to cool for 30-60 seconds.

6. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 1, characterized in that: In step S5, the punching and holding pressure is 250~300T, and the holding time is 50~60 seconds.

7. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 1, characterized in that: The processing technology for long-fiber PET elements suitable for vehicle body parts further includes step S6, which involves performing performance tests on the target-shaped long-fiber PET elements. The performance tests include at least one of water wading performance testing, mechanical performance testing, and lightweight testing. The mechanical performance testing includes pull-out force testing, tensile force testing, and tear force testing.

8. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 7, characterized in that: The processing technology for long fiber PET elements applicable to vehicle body parts further includes step S7, repeating steps S1 to S6, to prepare multiple long fiber PET elements of different target shapes that have passed performance testing, and then assembling the multiple long fiber PET elements together through connectors to obtain a long fiber PET element assembly.

9. The processing technology for long-fiber PET elements suitable for vehicle body parts according to claim 8, characterized in that: The processing technology for long-fiber PET elements applicable to vehicle body parts further includes step S8, repeating step S7 until multiple long-fiber PET element assemblies are obtained, and then the multiple long-fiber PET element assemblies are packed into boxes and stored in the warehouse in batches.

10. A vehicle component, characterized in that: It is prepared by the long fiber PET element processing technology applicable to vehicle body parts as described in any one of claims 1 to 9.

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