Manufacturing method of automobile ornament with decorative patterns and automobile body colors with visual 3D (three-dimensional) effect

Abstract

The invention relates to a manufacturing method of an automobile ornament with a visual 3D effect decorative pattern and an automobile body color, which comprises the following steps of: forming an automobile ornament body with the visual 3D effect decorative pattern and the automobile body color through a UV (ultraviolet) transfer printing technology, a silk-screen printing technology, a PVD (physical vapor deposition) coating technology, high-pressure molding or hot-press molding, IML (in-mold labeling) film embedding injection molding and the like; and a transparent protective coating can be further sprayed to obtain the automobile ornament with 3D decorative patterns and an automobile body color effect. Compared with the prior art, the automobile ornament is an ornament with a wave-transparent function, and the one-way loss can be controlled; the Db is 0.4-0.9 Db, and the reflection loss can be controlled to be lt; by means of the method, manufacturing of the automobile ornament with the visual 3D effect decoration pattern and the automobile body color can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile exterior decoration manufacturing, in particular to a method for manufacturing automobile decoration with decorative patterns and body color having visual 3D stereoscopic effects. Background Art

[0002] With the growing new energy vehicle market, more and more OEMs are shifting their development focus towards these vehicles. The radiator grille, once a staple of traditional fuel-powered vehicles, is no longer a necessity. The radiator grille, once known as the front face of a vehicle, has now become a key area of ​​focus for OEMs to differentiate their designs and showcase their brand. Body-colored decorative trims can achieve the same color as the vehicle, while adding a 3D effect to the design to avoid a monotonous overall color scheme. The combination of body color and 3D effects allows for the seamless integration of metallic logos and decorative patterns.

[0003] like Figure 2 As shown, existing automotive trims with 3D effects require the use of true 3D geometric structures, failing to achieve an organic integration with the vehicle body color and creating a noticeable disconnect from the vehicle body color. Existing 3D effects cannot directly achieve millimeter-wave transmission. To achieve this and reduce the impact of the 3D geometry on transmission loss, a layer of thermoplastic resin with a similar dielectric constant must be injection-molded on the 3D geometry side of the product. This ensures consistent overall wall thickness for the automotive trim, thereby reducing the impact on millimeter-wave transmission performance (transmission loss and reflection loss). Consequently, existing 3D radar covers require at least a double-layer structure. The drastic thickness variations in the double-layer panels caused by the 3D geometry can easily lead to shrinkage differences during the injection molding process, preventing perfect thickness consistency across different areas. This results in excessive millimeter-wave transmission loss, impacting millimeter-wave radar detection accuracy. Existing technologies for achieving 3D effects on millimeter-waves have a one-way transmission loss of 0.9 to 1.5 dB, and a reflection loss of -10 dB to -15 dB. Existing car body decorations can only achieve the overall body color decoration of the car decoration through the painting process, and cannot achieve the fusion of body color with 3D decorative patterns and solid color decorative effects. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a method for manufacturing automobile accessories with visual 3D stereoscopic effects and body-colored decorative patterns. Through UV transfer technology, screen printing technology, PVD coating technology, high-pressure forming or hot pressing forming, IML embedded film injection molding, etc., a body of automobile accessories with visual 3D stereoscopic effects and body-colored decorative patterns is formed, and automobile accessories with 3D stereoscopic effects and body-colored effects can be obtained. The automobile accessories realized by the invention are wave-transmitting functional accessories, and the unidirectional loss can be controlled to <0.4~0.9Db, and the reflection loss can be controlled to <-15Db.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The object of the present invention is to provide a method for manufacturing a car trim having a decorative pattern with a visual 3D effect and body color, the method comprising the following steps:

[0007] S1. Forming a UV glue layer with a local micro-nano structure on the surface of the transparent film through UV transfer technology;

[0008] S2. Forming an ink layer by screen printing on the surface of the UV glue layer obtained in step S1, wherein the pattern of the ink layer is a pattern having a vehicle body color decorative effect, and dividing the colors of different decorative patterns into regions;

[0009] S3. After printing is completed, the transparent film is preformed (the preforming method can be high-pressure preforming or hot-pressing preforming) to form a transparent film shell that is consistent with the appearance of the automobile trim;

[0010] S4, cutting off the edge waste and the middle hole of the transparent diaphragm shell after the shaping is completed;

[0011] S5. The transparent diaphragm shell with the edge waste and the middle hole cut out is subjected to IML film-inserted injection molding to form a decorative pattern with a visual 3D stereoscopic effect and a car body color automobile trim body.

[0012] Furthermore, after step S2 and before step S3, the following steps are further included:

[0013] S2', coating the printed surface of the transparent film with a metal effect layer by PVD coating technology. Due to the regional segmentation effect of the ink layer obtained in step S2, different decorative effects are formed in different areas of the transparent film.

[0014] Furthermore, the specific process of S2' is as follows: PVD coating is performed on the printed surface of the transparent film to form a metallic effect, and transparent protective ink is printed on the PVD surface of the transparent film after the PVD coating.

[0015] Furthermore, the UV glue layer with micro-nano structure is a micro-nano texture coating with uniform thickness.

[0016] Furthermore, after step S5, the following steps are further included:

[0017] S6. Complete the IML film-injected automotive trim body, and form a transparent protective coating of uniform thickness on the surface of the automotive trim body through spraying technology, and finally complete the automotive trim with 3D decorative patterns and body color effects.

[0018] Furthermore, the spraying technology is PUR perfusion spraying technology or Hardcoating spraying technology.

[0019] Furthermore, in step S5, before IML film-embedded injection molding, a metal heating wire is implanted on the non-printing surface of the transparent film to achieve the integration of heating and defrosting functions.

[0020] Furthermore, a metal heating wire is implanted on the non-printing surface of the transparent film using a 3D ultrasonic implanting device.

[0021] Furthermore, the ultrasonic wire implanting device preferably uses a 60KHz or 70Khz ultrasonic generator.

[0022] Furthermore, the metal heating wire preferably has a wire diameter of 0.04 mm to 0.3 mm.

[0023] Furthermore, the transparent film is a transparent polyester film.

[0024] Furthermore, the thickness of the transparent polyester film is preferably 0.5 mm.

[0025] Furthermore, in step S2, the method of regional segmentation of the colors of different decorative patterns is as follows: using screen printing technology to print light-shielding solid ink and ink with added effect pigments on the surface of the UV glue layer to form a pattern with a vehicle body color decorative effect, thereby achieving regional segmentation of the vehicle body color effect area and the 3D stereoscopic effect area, and using translucent solid ink to adjust the color of the 3D stereoscopic effect area.

[0026] Furthermore, the IML film-embedded injection molding process is as follows: the transparent film shell with the edge waste and the middle hole cut out is placed in the cavity of the injection mold, and then the injection molten resin is injected into the cavity formed by the injection mold and the transparent film, and combined with the transparent film to form a whole. The molten resin cools and solidifies into a decorative pattern with a visual 3D stereoscopic effect and a car trim body in the body color.

[0027] Furthermore, IML film-embedded injection molding: also known as in-mold insert injection molding, is a molding method in which ink is printed on the surface of a polyester film sheet, and the printed polyester film sheet is subjected to high-pressure molding or hot pressing to form a polyester film shell consistent with the 3D shape of the product. The outer shape and inner hole are then punched out, and then placed in the cavity of the injection mold. The molten resin is then injected into the cavity formed by the injection mold and the polyester film, combined with the polyester film to form a whole, and the molten resin is cooled and solidified into a product.

[0028] Furthermore, the molten resin is a molten thermoplastic resin.

[0029] Furthermore, the thermoplastic resin is preferably transparent PC (polycarbonate), and other injection molding resins such as ABS, PC / ABS, etc. can be selected according to performance requirements.

[0030] Furthermore, the process of the UV transfer technology is as follows: a texture is processed on the mold by laser engraving technology, and then uncured liquid UV glue is evenly applied on the mold with the texture. The glue and the transparent film are rolled by a pressure roller to form a liquid UV glue layer of uniform thickness between the transparent film and the mold; the UV glue is cured under the action of a UV lamp in a UV curing tunnel, and the transparent film is peeled off from the mold. The cured UV glue is attached to the transparent film, and the texture on the mold is completely copied to the transparent film through the UV glue, thereby realizing the transfer of the texture from the mold to the transparent film.

[0031] Furthermore, UV transfer involves creating a texture on the mold through techniques such as laser engraving. Uncured liquid UV glue is then evenly applied to the textured mold. The glue and polyester film are then pressed together using rollers to form a uniform layer of liquid UV glue between the film and the mold. The UV glue cures under the influence of UV lamps in a UV curing tunnel, and the film is peeled from the mold, leaving the cured UV glue attached to the polyester film. The texture on the mold is completely replicated on the film through the UV glue, effectively transferring the texture from the mold to the polyester film.

[0032] Furthermore, the screen printing includes an ink printing process and an ink baking process.

[0033] Furthermore, the ink is first used for printing, and then the ink is baked.

[0034] Furthermore, in the screen printing, the printing screen is preferably a polyurethane 300-mesh screen. If the printing area is large and the printing precision is high, a 300-mesh steel screen can be considered.

[0035] Furthermore, in the screen printing, the baking condition of the ink baking treatment is preferably 90° C. / 60 min.

[0036] Furthermore, the high-pressure preforming includes heating pretreatment, high-pressure treatment and vacuum treatment of the transparent film, wherein the heating temperature is preferably 350° C., the vacuum pressure is preferably -0.1 MPa, and the high-pressure pressure is preferably 8 MPa.

[0037] Furthermore, the aforementioned automotive trim body with a 3D visual effect and body color is applicable to bumpers, grilles, trim strips, signage, and other automotive exterior products requiring a 3D visual effect and body color. This invention can also be applied to millimeter-wave radar cover logos and front grille panels that require a 3D visual effect, integrated heating and defrosting functions, and body color effects.

[0038] Furthermore, the visual 3D effect is achieved by utilizing the Fresnel lens principle to perform sub-micron-level slicing and layering of the three-dimensional shape. Grayscale lithography is then used to create a reflective 3D effect. PVD metal coating significantly enhances this reflective 3D effect. This 3D effect, created through reflection from micro-nanostructures, has no viewing angle restrictions and no specific lighting source requirements.

[0039] Ultrasonic wire implantation: An oscillating circuit generates a high-frequency signal, which is converted into mechanical energy by a transducer. This energy is then transferred to the metal wire and plastic product through the welding head. Hundreds of thousands of vibrations per second, combined with pressure, create intense friction between the metal wire and the plastic product, melting the surface of the plastic product in contact with the metal wire. After the vibrations cease, the brief pressure maintained on the workpiece implants the metal wire into the partially melted plastic product surface.

[0040] Furthermore, body-color effects, as the name suggests, are decorative effects with the same color as the car body, providing a direct sense of color, whether red, black, Kingfisher Blue, Pittsburgh Gray, Cashmere Silver, or Supersonic Quartz White. Color effects without added effect pigments are called solid body-color effects; effects created by adding pigments that produce angle-dependent color effects to inks are called pearlescent / metallic body-color effects.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1) The present invention proposes a method for manufacturing an automotive trim with a visual 3D stereoscopic effect and a body color decorative pattern. Through UV transfer technology, screen printing technology, PVD coating technology, high-pressure forming or hot pressing forming, IML embedded film injection molding, etc., a decorative pattern with a visual 3D stereoscopic effect and a body color automotive trim body is formed. The automotive trim with a 3D stereoscopic effect and a body color effect can be obtained. The automotive trim realized by the invention is a wave-transmitting functional trim, and the unidirectional loss can be controlled to <0.4~0.9Db, and the reflection loss can be controlled to <-15Db.

[0043] 2) The present invention proposes a method for manufacturing automobile accessories with visual 3D stereoscopic effect decorative patterns and body color, which can obtain automobile accessories with visual 3D stereoscopic effect decorative patterns and body color, and can achieve the fusion of body color with 3D stereoscopic decorative patterns and solid color decorative effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a process flow chart of the method for manufacturing automobile accessories with visual 3D stereoscopic decorative patterns and body color provided by the present invention.

[0045] Figure 2 This is a schematic cross-sectional view of an automotive trim with a 3D stereoscopic effect achieved using existing technology.

[0046] Figure 3 A schematic plan view of a polyester film with a visual 3D stereoscopic effect and a vehicle body color effect achieved through UV transfer, screen printing, and PVD coating provided by the present invention.

[0047] Figure 3-1 It is a schematic diagram of the longitudinal section of the diaphragm with visual 3D stereoscopic effect and body color decorative effect.

[0048] Figure 4 The present invention provides a longitudinal cross-sectional schematic diagram of a polyester film shell with product shape, 3D stereoscopic effect and vehicle body color effect after edge waste cutting.

[0049] Figure 5 This is a schematic longitudinal cross-sectional view of the polyester film shell with the metal heating wire implanted provided by the present invention.

[0050] Figure 6 This is a schematic diagram of the layout of the metal heating wire provided by the present invention.

[0051] Figure 7 This is a cross-sectional view of an automobile trim with 3D decorative graphics provided by the present invention.

[0052] Figure 8 This is a schematic diagram of the enlarged micro-nano texture provided by the present invention.

[0053] Figure 9 This is a schematic flow chart of the high-pressure preforming process provided by the present invention.

[0054] The numbers in the figure show:

[0055] 1. Metal wire, 2. Connector pin pad, 5. 3D effect area, 6. PUR coating, 7. Metal paste for welding the metal wire and pad, 8. Transparent thermoplastic resin, 9. Connector pin, 10. Connector housing, 11. Black thermoplastic resin, 12. Metal paste protective coating, 13. Adhesive.

[0056] B, printed high-gloss black effect, D, micro-nano texture area, M, other color effect decoration area, S, body color effect area;

[0057] F1, transparent PC film, F2, micro-nano texture UV glue, F3, body color printing ink layer, F4, transparent varnish protective layer, F5, body color effect hollow area, F7, adhesive layer, F8, micro-nano texture achieved by UV glue, F9, metal heating wire, F10 connector shell, F11, solder pad area, F12, connector metal pins

[0058] F8-1, micro-nano texture convex shape achieved by UV glue, F8-2, micro-nano texture concave shape achieved by UV glue, F8-4, continuous UV glue. DETAILED DESCRIPTION

[0059] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0060] like Figure 1 As shown, the present invention provides a method for manufacturing decorative patterns and vehicle body color automobile accessories with visual 3D stereoscopic effects. A UV glue layer with a local micro-nano structure is formed on the surface of a polyester film (i.e., a diaphragm, the polyester film is a transparent polyester film) by UV transfer technology; then, a light-shielding solid ink and an ink with added effect pigments are printed on the surface of the UV glue layer by screen printing technology to form a vehicle body color decorative pattern, thereby realizing regional segmentation between the vehicle body color effect area and the 3D stereoscopic effect area, and the translucent solid ink is used to adjust the color of the 3D stereoscopic effect area; a metal effect layer is coated on the printed surface of the polyester film by PVD coating technology, and different decorative effects are formed in different areas of the polyester film due to the regional segmentation effect of the ink layer; the printed diaphragm is plasticized by high-pressure forming or hot pressing to form a polyester film with the same shape and appearance as the product. Membrane shell; the edge waste and middle hole of the polyester film shell that has been shaped are cut off through a cutting mold; the polyester film shell with product shape with the edge waste and middle hole cut off is subjected to IML film-embedded injection molding to form a car trim body with a visual 3D stereoscopic effect decorative pattern and body color. According to functional requirements, metal heating wire can be implanted on the non-printing surface of the polyester film before IML film-embedded injection molding to realize the integration of heating and defrosting functions; the car trim body that has completed IML film-embedded injection molding can be formed with a transparent protective coating of uniform thickness on the surface of the polyester car trim body through PUR infusion spraying technology or Hardcoating spraying technology, and finally the car trim with a 3D stereoscopic effect decorative pattern and body color effect is completed.

[0061] Example 1

[0062] This embodiment provides a method for manufacturing a vehicle trim having a decorative pattern with a visual 3D effect and body color, the method comprising the following steps:

[0063] Step 1: Use photolithography equipment or precision machining equipment to make a micro-nano texture master. Figure 8 As shown in FIG, the micro-nano texture is transferred from the master to the surface of the transparent polyester film using UV transfer technology, and a UV glue layer with a micro-nano structure is formed on the surface of the transparent polyester film, as shown in FIG. Figure 8 As shown, the UV glue layer with micro-nano structure (UV glue with micro-nano texture F2) includes the micro-nano texture F8 realized by UV glue, and the micro-nano texture F8 realized by UV glue includes continuous UV glue F8-4. The surface of the continuous UV glue F8-4 has the micro-nano texture convex shape F8-1 realized by UV glue and the micro-nano texture concave shape F8-2 realized by UV glue.

[0064] In this step, the thickness of the transparent polyester film is preferably a 0.5 mm transparent polycarbonate film, for example, a polycarbonate film model DE1-1 produced by Covestro can be used.

[0065] STEP 2: Screen-print an ink layer onto a polyester film with a UV adhesive layer containing a micro-nanostructured surface. The ink layer is patterned with the vehicle's color, with the color of the decorative pattern segmented into different areas. Using PVD coating technology (existing PVD coating technology can be used), a metallic effect layer is applied to the printed surface of the transparent film. The resulting segmented ink layer creates distinct decorative effects in different areas of the polyester film. A transparent protective ink is then printed on the PVD surface.

[0066] In this step, the membrane is processed using a screen printing process. During the screen printing process, the micro-nano textured areas are hollowed out, and no ink is printed. For example, the star area of ​​the central logo is hollowed out, and the area surrounding the star is printed with a high-gloss black (a translucent solid ink). The areas outside the high-gloss black area are printed with a body color effect ink. In this example, the body color is pearlescent blue with added effect pigments. Printing forms an ink layer.

[0067] In this embodiment, the screen printing process includes ink printing and ink baking treatment. The preferred inks are Imperial IPX series and Baolong HTRN inks, and the preferred printing screen is polyurethane 300-mesh screen. If the printing area is large and the printing accuracy is high, a 300-mesh steel screen can be considered. The baking conditions are preferably 90°C / 60min.

[0068] like Figure 3 、 3-1Schematic diagrams of the plane and longitudinal section of the polyester film (film) obtained after steps STEP1 and 2 are shown. Figure 3 In the process, the polyester film obtained after steps STEP 1 and 2 includes four areas: a printed high-gloss black effect B, a micro-nano texture area D, an area with other color effects and decorations M, and an area with a body color effect S. Figure 3-1 In the process, the polyester film obtained after steps STEP1 and 2 includes a transparent PC film F1, a micro-nano textured UV adhesive F2, an ink layer (including an alternately arranged vehicle body color printing ink layer F3 and a vehicle body color effect hollow area F5), a transparent varnish protective layer F4, and an adhesive layer F7.

[0069] Step 3: The printed polyester film is preformed under high pressure to form a shape of an automotive trim.

[0070] In this step, the printed polyester film is subjected to high-pressure preforming treatment to form a polyester film shell having the shape of an automobile accessory product (consistent with the appearance of the automobile accessory).

[0071] The high pressure preforming process in this embodiment includes heating pretreatment, high pressure treatment and vacuum treatment of the polyester film, and the specific sequence is as follows: Figure 9 As shown, 1. IR heats the polyester film (heating pretreatment), 2. The polyester film reaches a plastic state, 3. The mold moves upward and vacuum is sucked (vacuum treatment), 4. High pressure is then applied to the upper part of the mold (high-pressure treatment) to form the mold, wherein the heating temperature is preferably 350°C, the vacuum pressure is preferably -0.1Mpa, and the high-pressure pressure is preferably 8Mpa.

[0072] Step 4: After the preformed polyester film is punched and the edge waste is removed, it is formed into the shape that the automotive accessories need to be covered, such as Figure 4 As shown, the polyester film shell with product shape having 3D stereoscopic effect and vehicle body color effect is cut out from the finished edge waste.

[0073] In this step, the preformed polyester film shell is punched by using punching equipment and a punching die (or a film cutting tool), and the edge waste and the middle hole of the shaped transparent film shell are cut off to form the shape that needs to be covered by the automotive accessories.

[0074] Step 5: After the die-cutting of the polyester film shell, the metal heating wire is implanted on the non-printed side of the polyester film shell through the 3D ultrasonic implantation equipment (the layout of the metal heating wire is as follows Figure 6 As shown), and complete the soldering of the connector, as Figure 5 The figure shows a longitudinal cross-sectional view of the polyester film shell into which the metal heating wire is implanted.

[0075] In this step, the ultrasonic implantation device is preferably a 60KHz or 70Khz ultrasonic generator. The metal heating wire is preferably a metal heating wire with a wire diameter of 0.04mm to 0.3mm.

[0076] Step STEP6: After completing the high-pressure preforming of the product shape contour (step STEP3), the edge waste cutting (step STEP4), and the metal heating wire implantation (step STEP5), the polyester film shell is used as an insert, and the embedded film injection molding (IML embedded film injection molding) is performed in the injection mold to finally form a car trim body product with a visual 3D stereoscopic effect decorative pattern and body color, such as Figure 7 The product includes a transparent PC film F1, a micro-nano textured UV adhesive F2 (the micro-nano textured UV adhesive F2 includes a micro-nano texture F8 achieved by the UV adhesive), a transparent varnish protective layer F4, an adhesive layer F7, a metal heating wire F9 connected to a soldering pad area F11, the soldering pad area F11 connected to a connector housing F10, and the connector housing F10 connected to a metal connector pin F12.

[0077] In this step, a polyester film shell having the shape of an automotive trim product is used as an insert and placed in the cavity of an injection mold. Molten thermoplastic resin is injected into the cavity formed by the polyester film shell and the mold core. After the molten thermoplastic resin cools, it combines with the polyester film shell to form a mold.

[0078] In this embodiment, the thermoplastic resin is preferably transparent PC (polycarbonate), and other injection molding resins such as ABS, PC / ABS, etc. can be selected according to performance requirements.

[0079] The automotive accessories realized through the invention are wave-transmitting accessories, with one-way loss controllable to <0.4~0.9Db and reflection loss controllable to <-15Db.

[0080] Example 2

[0081] This embodiment further includes the following steps based on the first embodiment:

[0082] Step 7: After the IML film-injected automotive trim body is completed, a transparent protective coating with uniform thickness is formed on the surface of the automotive trim body by spraying technology, thereby further completing the automotive trim with 3D decorative patterns and body color effects.

[0083] Example 3

[0084] This embodiment provides a method for manufacturing a vehicle trim having a decorative pattern with a visual 3D effect and body color, the method comprising the following steps:

[0085] Step 1: A micro-nano texture coating with uniform thickness is formed on the back of the transparent polyester film by UV transfer;

[0086] Step 2: Printing translucent solid color ink on the area with micro-nano texture on the surface of the cured UV coating;

[0087] Step 3: Printing the vehicle body color effect ink on the area without micro-nano texture on the surface of the cured UV coating;

[0088] Step 4: The back of the printed polyester film is PVD coated to create a metallic effect;

[0089] Step 5: Print transparent protective ink on the PVD surface of the PVD-coated polyester film;

[0090] Step 6: The film printed with transparent protective ink is subjected to high pressure / hot pressing;

[0091] Step 7: Cut the polyester film after the product shape is completed, and remove the waste and holes;

[0092] Step 8: After the polyester film is cut into shape, the metal heating wire is implanted;

[0093] Step 9: Complete the IML film-embedded injection molding of the polyester film with the metal heating wire embedded;

[0094] Step 10: After the IML film-molded trim is completed, a transparent protective coating is formed on the surface of the trim.

[0095] Comparative Example

[0096] This comparative example provides a cross section of an automobile trim obtained by an existing automobile trim manufacturing method, and realizes the overall body color decoration of the automobile trim through a painting process, such as Figure 2 As shown, it is a cross-sectional schematic diagram of an automobile trim with a 3D stereoscopic effect achieved by the prior art. Figure 2 In the figure, the automotive trim, from top to bottom, comprises a PUR coating 6, a metal wire 1, a transparent thermoplastic resin 8, a 3D effect area 5, an adhesive 13, and a black thermoplastic resin 11. A metal paste protective coating 12 is applied between the PUR coating 6. The metal paste 7 of the soldering wire and pad is connected to the metal wire 1, the connector pin pad 2 is connected to the metal paste 7 of the soldering wire and pad, and the connector pin 9 is connected to the connector pin pad 2. The drastic thickness variations of the double-layer board caused by the 3D geometry can easily lead to shrinkage differences during the injection molding process, making it impossible to achieve completely uniform thickness in different areas. This in turn results in excessive millimeter-wave transmission loss, affecting millimeter-wave radar detection accuracy. Existing technologies for achieving 3D effects on millimeter-waves have a one-way transmission loss of 0.9 to 1.5 dB, and a reflection loss of -10 dB to -15 dB. Existing body trims can only achieve body-color decoration of the entire trim through a spray painting process, failing to integrate the body color with 3D decorative patterns or solid colors.

[0097] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A method for manufacturing a car trim with a 3D visual effect and a decorative pattern and body color, characterized in that: The method comprises the following steps: S1. Forming a UV glue layer with micro-nano structure on the surface of the transparent film through UV transfer technology; S2. Forming an ink layer by screen printing on the surface of the UV glue layer obtained in step S1, wherein the pattern of the ink layer is a pattern having a vehicle body color decorative effect, and dividing the colors of different decorative patterns into regions; S3. After printing is completed, the transparent film is preformed and shaped to form a transparent film shell that is consistent with the appearance of the automobile trim; S4, cutting off the edge waste and the middle hole of the transparent diaphragm shell after the shaping is completed; S5. The transparent diaphragm shell with the edge waste and the middle hole cut out is subjected to IML film-inserted injection molding to form a decorative pattern with a visual 3D stereoscopic effect and a car body color automobile trim body.

2. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 1, characterized in that: After step S2 and before step S3, the following steps are further included: S2', coating the printed surface of the transparent film with a metal effect layer by PVD coating technology. Due to the regional segmentation effect of the ink layer obtained in step S2, different decorative effects are formed in different areas of the transparent film.

3. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 1, characterized in that: After step S5, the method further includes the following steps: S6. Complete the IML film-embedded injection molding of the automotive trim body, and form a transparent protective coating of uniform thickness on the surface of the automotive trim body through spraying technology to complete the automotive trim with 3D decorative patterns and body color effects.

4. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 3, characterized in that: The spraying technology is.

5. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 1, characterized in that: In step S5, before IML film-embedded injection molding, metal heating wires are implanted on the non-printing surface of the transparent film to achieve the integration of heating and defrosting functions.

6. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 1, characterized in that: The transparent film is a transparent polyester film.

7. The method for manufacturing a car trim with a 3D visual effect and body color decorative pattern according to claim 1, characterized in that: In step S2, the method of performing regional segmentation on the colors of different decorative patterns is as follows: Screen printing technology is used to print light-shielding solid ink and ink with added effect pigments on the surface of the UV glue layer to form a pattern with a body color decorative effect, thereby achieving regional separation between the body color effect area and the 3D stereoscopic effect area, and the translucent solid ink is used to adjust the color of the 3D stereoscopic effect area.

8. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 1, characterized in that: The process of IML film-insertion molding is as follows: The transparent diaphragm shell with the edge waste and the middle hole cut out is placed in the cavity of the injection mold, and then the injection molten resin is injected into the cavity formed by the injection mold and the transparent diaphragm, combining with the transparent diaphragm to form a whole. The molten resin cools and solidifies into a decorative pattern with a visual 3D stereoscopic effect and a car trim body in the body color.

9. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 1, characterized in that: The process of the UV transfer technology is as follows: The texture is processed on the mold by laser engraving technology, and then uncured liquid UV glue is evenly coated on the textured mold. The glue and transparent film are rolled by a pressure roller to form a liquid UV glue layer of uniform thickness between the transparent film and the mold; The UV glue is cured under the action of UV lamp in the UV curing tunnel, and the transparent film is peeled off from the mold. The cured UV glue is attached to the transparent film, and the texture on the mold is copied to the transparent film through the UV glue, thereby realizing the transfer of the texture from the mold to the transparent film.

10. The method for manufacturing a car trim with a 3D visual effect and a body color decorative pattern according to claim 1, characterized in that: The screen printing includes an ink printing process and an ink baking process.

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