Automotive trim parts and their manufacturing methods

Abstract

This application relates to an automotive trim part and its manufacturing method. The automotive trim part includes a base layer and a surface layer bonded to the base layer. The base layer is made of polymer composite fiber; the surface layer is made of PET material, and the surface layer and base layer are bonded together by hot pressing. The manufacturing method of the automotive trim part includes the following steps: providing a base layer and a surface layer; and hot pressing the base layer and surface layer to achieve adhesion between them. In the manufacturing process of this automotive trim part, hot pressing enables the base layer and surface layer to form an excellent interlocking and bonding effect, thereby saving adhesives, saving materials, reducing costs, and significantly reducing the formation of volatile organic compounds, thus improving environmental friendliness.

Description

Technical Field

[0001] This application relates to the field of automotive manufacturing technology, and in particular to automotive trim parts and their preparation methods. Background Technology

[0002] With the development of automotive trim manufacturing technology, a hot-pressing composite technology has emerged that uses materials such as glass fiber, ordinary PP staple fiber, ordinary PE staple fiber, pure cotton fiber, or EVA foam layer with PET material (polyethylene terephthalate). However, because the interlayer adhesion strength formed when PET material is hot-pressed with the above materials is relatively low, it is still necessary to spray a large amount of adhesive between the layers to achieve effective adhesion between PET material and the above materials.

[0003] This process for manufacturing automotive trim parts primarily utilizes adhesives to composite PET materials with other suitable materials, with hot pressing and welding playing only a supporting role. The extensive use of adhesives leads to high production costs due to raw material consumption and also results in high emissions of volatile organic compounds (VOCs), exceeding harmful substance limits and making environmental compliance difficult. Meeting environmental requirements necessitates the installation of appropriate environmental treatment equipment, leading to significant investment and operating costs. Alternatively, using specialized environmentally friendly adhesives further increases costs. Conversely, reducing adhesive usage directly results in decreased bond strength and a significantly increased risk of delamination. When composites with PET materials such as glass fiber or pure cotton fiber, interlayer delamination and low bond strength necessitate additional surface modification of the glass fiber or pure cotton fiber. For example, plasma treatment of pure cotton fiber can create micropores on the fiber surface to increase surface roughness and meet composite requirements, making the process even more complex. This preparation method requires a large amount of manual coating work, making the production process difficult to control, resulting in inconsistent quality, high production costs, low production efficiency, and poor recyclability of the finished product. Similarly, using high-viscosity adhesives to replace ordinary adhesives also increases costs.

[0004] Furthermore, automotive trim parts produced using this process suffer from defects such as poor toughness, susceptibility to wear, and poor tear resistance. Adding toughening agents or wear-resistant additives, employing multi-layer composite structures, and post-processing strengthening of the finished product further degrade core performance, complicate the process, and significantly increase costs. Moreover, the resulting automotive trim parts are prone to surface shrinkage, sheet warping, and significant deviations between actual and design dimensions. Using pre-shrinkage treatments, cooling processes, and final shaping treatments can further damage material properties, resulting in low production efficiency and high equipment modification costs. Summary of the Invention

[0005] Therefore, it is necessary to address the issue of high production costs for automotive trim parts by providing a lower-cost automotive trim part and its preparation method.

[0006] This application provides an automotive trim piece, comprising:

[0007] The base layer is made of polymer composite fiber;

[0008] The surface layer is bonded to the base layer and is made of PET material. The surface layer and the base layer are bonded together by hot pressing.

[0009] In one embodiment, the surface of the top layer facing away from the base layer has a velvety surface;

[0010] And / or, the thickness of the base layer is 1mm-5mm.

[0011] This application also provides a method for preparing automotive trim parts, comprising the following steps:

[0012] A base layer and a surface layer are provided, wherein the base layer is made of polymer composite fiber and the surface layer is made of PET material;

[0013] The base layer and the surface layer are subjected to hot pressing to achieve bonding between the base layer and the surface layer.

[0014] In one embodiment, the base layer includes a base layer body and a hot-melt reinforcing film with heat-conducting holes, wherein both the base layer body and the hot-melt reinforcing film are made of polymer composite fibers;

[0015] In the hot-pressing process of the base layer and the surface layer, the hot-melt reinforcing film is placed between the base layer and the surface layer. The base layer, the hot-melt reinforcing film, and the surface layer are heated and pressurized using a hot press. The hot-melt reinforcing film melts and adheres to the base layer and the surface layer.

[0016] In one embodiment, in the step of providing the hot melt reinforcing film, the polymer composite fibers are made into a hot melt mesh film with a mesh structure, the hot melt mesh film constituting the hot melt reinforcing film, and the mesh of the hot melt mesh film constituting the heat-conducting holes.

[0017] In one embodiment, in the step of providing the hot melt reinforcing film, the polymer composite fibers are formed into a hot melt web with a mesh structure by an airflow web formation method or a carding web formation method, and the hot melt web constitutes the hot melt reinforcing film.

[0018] In one embodiment, the hot-pressing process for the base layer and the surface layer includes the following steps:

[0019] The base layer and the surface layer are laid at the designated positions in the hot press;

[0020] The hot press is closed, and the heating temperature of the hot press is adjusted to the first heating temperature. The hot press heats the surface layer and the base layer, and the surface layer and the base layer soften after being heated.

[0021] The heating temperature of the hot press is adjusted to a second heating temperature, which is higher than the first heating temperature, and the base layer and the surface layer are fused together after being heated.

[0022] In one embodiment, in the hot-pressing process of the base layer and the surface layer, a hot press is used to heat and pressurize the base layer and the surface layer. After completing the heating and pressurizing process of the base layer and the surface layer, the following steps are further included:

[0023] The heating temperature of the hot press is gradually reduced to room temperature; the hot press is then depressurized and the mold is opened.

[0024] In one embodiment, after hot pressing the base layer and the surface layer is completed, the following steps are further included:

[0025] The base layer and the surface layer, which are bonded together, are compacted using a flattening roller.

[0026] In one embodiment, the hot-pressing process for the base layer and the surface layer includes the following steps:

[0027] The base layer and the surface layer are dried, and the base layer and the surface layer are softened after the drying process;

[0028] The softened base layer and the surface layer are placed in a set position in a hot press, and the hot press is used to heat and pressurize the base layer and the surface layer.

[0029] In the aforementioned automotive trim parts and their preparation methods, the base layer composited with the surface layer is made of polymer composite fiber. Based on the good molecular compatibility between polymer composite fiber and PET material, during the preparation of the automotive trim parts, hot pressing can be used to form an excellent interlocking and bonding effect between the base layer and the surface layer, thereby saving adhesives used between the base layer and the surface layer, saving materials, reducing costs, and greatly reducing the volatile organic compounds formed by the use of adhesives, thus improving environmental friendliness. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of an automotive trim component in one embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the structure of the base layer in an embodiment of this application, before it has been subjected to hot pressing.

[0032] Figure 3 This is a schematic diagram of the structure of the surface layer in an embodiment of this application without hot pressing.

[0033] Figure 4 This is a schematic diagram of the steam hot press in the open state according to one embodiment of this application.

[0034] Figure 5 This is a schematic diagram of the steam hot press in a closed state according to an embodiment of this application.

[0035] Figure 6 This is a flowchart illustrating a method for preparing automotive trim parts according to one embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 11. Base layer; 12. Surface layer; 21. Upper mold; 22. Lower mold; 23. Steam inlet. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via 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. Similarly, "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.

[0043] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0044] See Figure 1 , Figure 1 This illustration shows a structural schematic diagram of an automotive trim component according to one embodiment of this application. The automotive trim component provided in this embodiment includes a base layer 11 and a surface layer 12 bonded together with the base layer 11. The base layer 11 is made of polymer composite fiber; the surface layer 12 is made of PET material. The surface layer 12 and the base layer 11 are bonded together by hot pressing. Because the base layer 11 is made of polymer composite fiber, and based on the good molecular compatibility between polymer composite fiber and PET material, hot pressing during the preparation of this automotive trim component enables the base layer 11 and the surface layer 12 to form a good molecular-level interlocking and bonding effect. This saves on adhesives used between the base layer 11 and the surface layer 12, saving materials and reducing costs. The volatile organic compounds formed due to the use of adhesives are also greatly reduced, improving environmental friendliness.

[0045] like Figure 6As shown, one embodiment of this application provides a method for preparing the automotive trim part, comprising the following steps:

[0046] S100, providing a base layer 11 and a surface layer 12;

[0047] S200. Hot pressing is performed on the base layer 11 and the surface layer 12 to achieve bonding between the base layer 11 and the surface layer 12.

[0048] This application utilizes the good molecular compatibility between polymer composite fibers (PCF) and PET materials to achieve a good molecular-level interlocking and bonding effect between the base layer 11 and the surface layer 12 during the preparation of the automotive trim part. In some embodiments, hot pressing and a small amount of adhesive can meet the bonding requirements between the base layer 11 and the surface layer 12. In the process of composite bonding of the base layer 11 and the surface layer 12, hot pressing plays the main role, while adhesive plays an auxiliary role, reducing the amount of adhesive used between the surface layer 12 and the base layer 11. In some embodiments, it is even possible to eliminate the need for adhesive between the base layer 11 and the surface layer 12, as the bonding strength between the base layer 11 and the surface layer 12 after hot pressing can meet the requirements, thereby saving materials, reducing costs, and significantly reducing volatile organic compounds (VOCs) generated by the use of adhesives, which is beneficial to environmental protection and reduces environmental protection costs.

[0049] In some embodiments, the surface layer 12 is made of PET blanket fabric, and the surface of the surface layer 12 facing away from the base layer 11 has a velvety surface. The velvety surface of the surface layer 12 constitutes one surface of the automotive trim, giving the surface of the automotive trim softness and other properties.

[0050] In some embodiments, the preparation method uses needle punching or hot rolling to form the PET blanket into the surface layer 12, and the surface layer 12 may be left untreated by corona or plasma treatment.

[0051] In some embodiments, without hot pressing, the base layer 11 is flat, and from a side view, the structure of the base layer 11 is as follows: Figure 2 As shown.

[0052] In some embodiments, the thickness of the base layer 11 is 1mm-5mm. When the base layer 11 and the surface layer 12 are hot-pressed using a hot press, the composite surface of the base layer 11 with this thickness can have good heating efficiency, thereby forming a sufficient melting effect, and thus enabling the composite surface of the base layer 11 to form a good fusion effect with the surface layer 12.

[0053] In some embodiments, without hot pressing, the surface layer 12 is blanket-like, and from a side view, the structure of the surface layer 12 is as follows: Figure 3 As shown.

[0054] In some embodiments, the base layer 11 includes a base body and a hot-melt reinforcing film with heat-conducting holes. In the step of preparing the base layer 11, polymer composite fibers are selected to prepare the base body and the hot-melt reinforcing film. In the hot-pressing process between the base layer 11 and the surface layer 12, the hot-melt reinforcing film is placed between the base body and the surface layer 12. A hot press is used to heat and pressurize the base body, the hot-melt reinforcing film, and the surface layer 12, causing the hot-melt reinforcing film to melt and bond with the base body and the surface layer 12, thus achieving fusion bonding between the base layer 11 and the surface layer 12. The design of the heat-conducting holes increases the heat-receiving area of ​​the hot-melt reinforcing film, thereby promoting the melting of the hot-melt reinforcing film and resulting in excellent adhesion between the base body and the surface layer 12.

[0055] In some embodiments, in the step of providing the hot-melt reinforced film, the polymer composite fibers are formed into a hot-melt mesh film with a network structure. This hot-melt mesh film constitutes the hot-melt reinforced film, and the mesh openings of the hot-melt mesh film constitute heat-conducting pores; that is, the hot-melt reinforced film is a hot-melt mesh film with a network structure. During the hot-pressing process, the structural design of the multiple mesh openings further expands the heat-receiving area of ​​the hot-melt reinforced film, resulting in better melting performance.

[0056] In some embodiments, during the step of providing the hot-melt reinforced film, the polymer composite fibers are formed into a hot-melt web using an air-blowing method. In other embodiments, the polymer composite fibers can also be formed into a hot-melt web using a carding method.

[0057] In some embodiments, polymer composite fibers are formed into nonwoven fabric using an air-blowing or carding method, and the nonwoven fabric is then preheated and rolled to form the desired hot-melt reinforcing film; no surface modification or additives are required for the nonwoven fabric. Polymer composite fibers are high-molecular materials, which cause less hard wear on equipment. Compared to traditional glass fiber materials, equipment maintenance frequency is reduced by 50%, and equipment maintenance costs are reduced by 40%-50%.

[0058] In some embodiments, the base body is plate-shaped. In other embodiments, the base body may be designed in other shapes as needed.

[0059] In some embodiments, the hot-pressing process for the base layer 11 and the surface layer 12 includes the following steps: laying the base layer 11 and the surface layer 12 at a predetermined position in the hot press; closing the hot press and adjusting its heating temperature to a first heating temperature, heating the surface layer 12 and the base layer 11, causing them to soften and facilitating full adhesion between them, thus reducing interlayer gaps; then adjusting the heating temperature of the hot press to a second heating temperature, which is higher than the first heating temperature, causing the base layer 11 and the surface layer 12 to fuse together. This method, based on the full adhesion between the surface layer 12 and the base layer 11, improves the welding effect between them.

[0060] In some embodiments, during the hot-pressing process of the base layer 11 and the surface layer 12, after heating and pressurizing the base layer 11 and the surface layer 12 using a hot press, the following steps are further included: gradually reducing the heating temperature of the hot press to room temperature; and then depressurizing and opening the mold of the hot press. During this process, the temperature of the fused surface layer 12 and base layer 11 gradually decreases to room temperature as the heating temperature changes, solving the problem of board warping and interlayer delamination caused by rapid cooling of the surface layer 12 and base layer 11 to room temperature. This achieves a firm bond between the surface layer 12 and the base layer 11 after cooling, resulting in more stable product dimensions.

[0061] In some embodiments, after hot pressing the base layer 11 and the surface layer 12, the method further includes the following step: compacting the bonded base layer 11 and surface layer 12 using a flattening roller. This method, which can be called secondary compaction, can further reduce the micro-gaps between layers and improve the bonding stability.

[0062] In some embodiments, the hot-pressing process between the base layer 11 and the surface layer 12 includes the following steps:

[0063] The base layer 11 and the surface layer 12 are dried, and softened after drying. The softened base layer 11 and surface layer 12 are then placed in a designated position in a hot press, where they are further heated and pressurized. This pretreatment method of softening the base layer 11 and surface layer 12 facilitates accurate placement into the designated position in the hot press.

[0064] In some embodiments, the base layer 11 and the surface layer 12 are placed in an oven for drying. The oven temperature is set to 60℃-80℃, and the moisture content of the base layer 11 and the surface layer 12 is controlled to be ≤0.5%. This replaces the traditional method of deep drying the base layer 11 made of pure cotton, the traditional method of modifying the base layer 11 made of glass fiber with a coupling agent, and the traditional method of modifying the base layer 11 made of PP or PE material with wear-resistant masterbatch. This reduces raw material costs by 10%-15%, energy consumption by 15%-20%, reduces the number of processes by 2 to 3, increases production efficiency by 30%-50%, and reduces labor costs by 20%-25%, thus reducing costs through multiple steps. In other embodiments, a preheating oven can also be used to dry the base layer 11 and the surface layer 12.

[0065] In some embodiments, a steam hot press is selected as the hot press. For example... Figure 4As shown, the steam hot press includes an upper mold 21 and a lower mold 22. Steam inlets 23 are provided on both the left and right sides of the upper mold 21, and steam inlets 23 are also provided on both the left and right sides of the lower mold 22. During the hot pressing process of the base layer 11 and the surface layer 12, the upper mold 21 and the lower mold 22 are closed. Figure 5 As shown, the upper mold 21 and the lower mold 22 are used to heat and pressurize the surface layer 12 and the base layer 11, respectively.

[0066] In some embodiments, the automotive trim piece is used as a side and bottom guard plate for the trunk. Its suede design effectively enhances the protection of luggage and improves user comfort. Furthermore, the manufacturing method described in this application can be used in 90% of mass-produced side guard plate applications.

[0067] In some embodiments, automotive trim pieces can also be used as interior trim pieces such as cabin carpets. In other embodiments, automotive trim pieces can also be used as exterior trim pieces.

[0068] In some embodiments, the preparation method of automotive trim parts can achieve good adhesion between the surface layer 12 and the base layer 11 without the use of adhesives, significantly reducing costs and promoting product upgrades. Furthermore, based on this adhesive-free process, the emission of volatile organic compounds (VOCs) is almost zero, eliminating the need for additional VOC collection equipment and saving 100,000-200,000 RMB in environmental protection operating costs annually. In other embodiments, to meet particularly high usage requirements, the preparation method of automotive trim parts uses a small amount of adhesive to assist in the bonding and lamination between the surface layer 12 and the base layer 11, reducing adhesive usage by more than 50% and lowering costs by 60%-70%. Traditional material lamination with PET blankets is a simple physical bonding; while PCF material lamination with PET blankets is a chemical bonding combined with a physical bonding, which can greatly improve product performance, save materials, reduce production process costs, reduce VOC odor, benefit the environment, and improve product recycling rates. During implementation, existing PET blanket lamination production lines can be used, with specific parameters adjusted as needed, saving production line modification costs and facilitating rapid switchover to production.

[0069] In some embodiments, the method for preparing automotive trim parts includes the following steps:

[0070] S1. Provide surface layer 12. More specifically, cut the PET blanket fabric in a flat state according to the design requirements. At the same time, pay attention to whether the PET blanket fabric has skipped stitches, holes, etc., so as to obtain a qualified surface layer 12.

[0071] S2. Provide base layer 11, including the following steps:

[0072] S21. Prepare the base body. More specifically, according to the size of the surface layer 12, cut a 1mm-5mm thick rigid PCF board to obtain a base body that matches the size of the surface layer 12.

[0073] S22. Prepare a hot-melt reinforced film. More specifically, use an airflow web forming method or a carding web forming method to form a hot-melt web film from polymer composite fibers to obtain a hot-melt reinforced film with a lower melting point.

[0074] S3. Perform hot pressing treatment on the base layer 11 and the surface layer 12. More specifically, this includes the following steps:

[0075] S31. Wipe the composite surface of the base layer with anhydrous ethanol to remove dust, oil and other impurities, reducing the impact of impurities on subsequent interlayer bonding; then use an oven to dry the base layer to reduce internal moisture and soften it, making it easier to place the base layer into the mold of the hot press; flatten the surface layer 12 under low tension and at room temperature to improve the wrinkles of the blanket and enhance the smoothness of the surface of the composite layer 12; and then use an oven to dry the surface layer 12.

[0076] S32. Lay the base layer, hot melt reinforcing film, and surface layer 12 in the hot press in sequence. The velvet side of the surface layer 12 faces away from the hot melt reinforcing film and the base layer, and make the three precisely aligned. The relative deviation of the edges of the three is ≤±1mm. Fix the base layer, hot melt reinforcing film, and surface layer 12 with positioning points to improve the phenomenon of wrinkles in the surface layer 12 and to improve the situation of slippage of the three during subsequent hot pressing.

[0077] S33. The upper mold 21 and lower mold 22 of the hot press are closed, and the heating temperature of the upper mold 21 and lower mold 22 is adjusted to the first heating temperature, 80℃≤first heating temperature≤100℃; the base body, hot melt reinforcing film and surface layer 12 are softened by heat and initially bonded together, which can effectively reduce the gap between the three and form an initial bonding and molding effect.

[0078] S34. The heating temperature of the upper mold 21 and lower mold 22 of the hot press is raised to the second heating temperature, 130℃≤second heating temperature≤160℃. This second heating temperature is lower than the decomposition temperature of the base layer 11 and the surface layer 12. The pressure of the hot press is adjusted to 3MPa-5MPa, and the pressure is maintained for 2 to 5 minutes, which can be selected according to the thickness of the base layer. The temperature deviation between the upper mold 21 and the lower mold 22 is ≤1℃. The heating temperatures of the upper mold 21 and the lower mold 22 should be kept as consistent as possible to minimize the shrinkage of the surface layer 12 or the deformation of the base layer due to excessive local temperature. During this period, based on the heating effect of the upper mold 21 and the lower mold 22, the base layer 11 and the surface layer 12 melt at the joint, forming a melt penetration and molecular-level bonding effect.

[0079] S35. The composite base layer 11 and surface layer 12 are rapidly and uniformly cooled, allowing the molten hot melt adhesive to solidify. The base layer 11 and surface layer 12 shrink synchronously to reduce internal stress. More specifically, the heating temperature of the upper mold 21 and lower mold 22 is gradually reduced to room temperature. This means that the heating temperature of the hot press is gradually reduced from the second heating temperature to room temperature through multiple adjustments, and the hot press must maintain that heating temperature for a set time after each adjustment. For example, the heating temperature of the upper mold 21 and lower mold 22 is first adjusted from 130℃ to 80℃ and the hot press is held for 1 minute. Then, the heating temperature of the hot press is adjusted from 80℃ to 30℃ and held for 1 minute, thus achieving a gradual reduction of the hot press heating temperature to room temperature. During this process, the surface layer 12 and base layer 11 also cool and solidify in a gradient with the change in heating temperature, enhancing the bonding strength between the two and forming a high-performance composite part. Subsequently, the pressure is released, the mold is opened, and the part is removed.

[0080] S4. Use a cutting machine to trim off the excess parts of the composite parts at the edges, so that the edges of the composite parts are neat, without burrs or delamination, thus achieving the trimming of the composite parts; at room temperature, use a flattening roller to lightly press the composite parts, with a pressure of 1MPa-2MPa, to further reduce the tiny gaps between layers, improve the bonding stability, and achieve the secondary compaction of the composite parts; if the pile surface is slightly collapsed, a brush can be used to lightly brush the pile surface to restore the pile surface state and improve the appearance of the finished product.

[0081] S5. Conduct quality inspections on the composite parts to control the quality of the finished product. More specifically, check if the interlayer peel strength of the composite parts is ≥8N / 3cm. If yes, the finished product is qualified; otherwise, it is unqualified. Repeat the 90° bending of the composite parts 50 times. If the finished product shows no delamination or separation, it is qualified; otherwise, it is unqualified. Check if the surface of the composite parts is free of bubbles, wrinkles, and indentations. If yes, the finished product is qualified; otherwise, it is unqualified. Check if the velvet surface is intact and undamaged. If yes, the finished product is qualified; otherwise, it is unqualified. Check the length, width, and thickness of the composite parts. If each measured value deviates from the set value by ≤±0.5mm and there is no warping or deformation, the finished product is qualified; otherwise, it is unqualified.

[0082] The preparation method of this automotive trim takes into account the interlayer bonding strength, finished product flatness and dimensional stability after lamination. It includes detailed procedures, parameters and practical points, and meets the requirements of industrial production.

[0083] In other embodiments, PCF boards of appropriate thickness can be customized according to specific finished product requirements, and then the PCF boards are cut into the required base body. In some embodiments, the hot press can also be a flat plate hot press or a roller continuous hot press.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A car trim component, characterized in that, The automotive trim includes: The base layer is made of polymer composite fiber; The surface layer is bonded to the base layer and is made of PET material. The surface layer and the base layer are bonded together by hot pressing.

2. The automotive trim component according to claim 1, characterized in that, The surface of the top layer opposite to the base layer has a velvety surface; And / or, the thickness of the base layer is 1mm-5mm.

3. A method for preparing an automotive trim part, characterized in that, Includes the following steps: A base layer and a surface layer are provided, wherein the base layer is made of polymer composite fiber and the surface layer is made of PET material; The base layer and the surface layer are subjected to hot pressing to achieve bonding between the base layer and the surface layer.

4. The method for preparing automotive trim parts according to claim 3, characterized in that, The base layer includes a base layer body and a hot-melt reinforcing film with heat-conducting holes. Both the base layer body and the hot-melt reinforcing film are made of polymer composite fiber. In the hot-pressing process of the base layer and the surface layer, the hot-melt reinforcing film is placed between the base layer and the surface layer. The base layer, the hot-melt reinforcing film, and the surface layer are heated and pressurized using a hot press. The hot-melt reinforcing film melts and adheres to the base layer and the surface layer.

5. The method for preparing automotive trim parts according to claim 4, characterized in that, In the step of providing the hot melt reinforced film, the polymer composite fibers are made into a hot melt mesh film with a mesh structure, the hot melt mesh film constitutes the hot melt reinforced film, and the mesh of the hot melt mesh film constitutes the heat-conducting holes.

6. The method for preparing automotive trim parts according to claim 4, characterized in that, In the step of providing the hot melt reinforced film, the polymer composite fibers are formed into a hot melt web film with a mesh structure by airflow web formation or carding web formation, and the hot melt web film constitutes the hot melt reinforced film.

7. The method for preparing automotive trim parts according to claim 3, characterized in that, The hot-pressing process for the base layer and the surface layer includes the following steps: The base layer and the surface layer are laid at the designated positions in the hot press; The hot press is closed, and the heating temperature of the hot press is adjusted to the first heating temperature. The hot press heats the surface layer and the base layer, and the surface layer and the base layer soften after being heated. The heating temperature of the hot press is adjusted to a second heating temperature, which is higher than the first heating temperature, and the base layer and the surface layer are fused together after being heated.

8. The method for preparing automotive trim parts according to claim 3, characterized in that, In the hot-pressing process of the base layer and the surface layer, a hot press is used to heat and pressurize the base layer and the surface layer. After the heating and pressing process of the base layer and the surface layer is completed, the following steps are also included: The heating temperature of the hot press is gradually reduced to room temperature. Perform a pressure relief and mold opening operation on the hot press.

9. The method for preparing automotive trim parts according to claim 3, characterized in that, After completing the hot-pressing process on the base layer and the surface layer, the following steps are also included: The base layer and the surface layer that are bonded together are compacted using a flattening roller.

10. The method for preparing automotive trim parts according to claim 3, characterized in that, The hot-pressing process for the base layer and the surface layer includes the following steps: The base layer and the surface layer are dried, and the base layer and the surface layer are softened after the drying process; The softened base layer and the surface layer are placed in a set position in a hot press, and the hot press is used to heat and pressurize the base layer and the surface layer.

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