Flame-retardant decorative part with in-layer coated LOGO and processing technology thereof

Abstract

The application provides a processing technology of a flame-retardant decorative part with an in-layer coated LOGO, which comprises the following steps: substrate preparation; LOGO silk printing on the inner surface of the substrate to form a LOGO layer; texture transfer printing on the inner surface of the substrate to form a texture layer covering the LOGO layer; PVD process is used to plate the surface of the texture layer to form a plating layer; layer-by-layer silk printing is performed on the surface of the plating layer to sequentially form an optical-shielding transition layer and a flame-retardant functional layer; gray release ink is silk printed on the flame-retardant functional layer, and a release layer is formed after baking treatment; the substrate is cut to obtain a plurality of pieces, each piece is subjected to high-pressure forming, the release layer is removed after the forming, and a semi-finished product is prepared; CNC fine carving processing is performed on the semi-finished product; and the decorative part is obtained after cleaning and full inspection. The application also provides a flame-retardant decorative part with an in-layer coated LOGO, which is prepared by using the above processing technology.

Description

Technical Field

[0001] This invention relates to the field of surface treatment technology for decorative parts of electronic products, and in particular to a flame-retardant decorative part with an inner-layer encapsulated logo and its processing technology. Background Technology

[0002] Currently, with the rapid development of the 3C consumer electronics industry, composite boards have become the mainstream substrate for electronic product casings due to their ability to achieve complex 3D shapes, excellent appearance and texture, and controllable cost.

[0003] In existing technologies, the conventional processing steps for composite panel decorative parts in the industry are as follows: texture transfer, PVD coating, logo screen printing, flame-retardant and light-shielding ink screen printing, cutting, high-pressure forming, CNC machining, cleaning, and inspection and assembly. However, the above-mentioned conventional processing steps for decorative parts have two core technical pain points that cannot be completely solved through parameter optimization: (1) In the industry, the logo screen printing process is generally placed after the transfer texture and PVD coating. The logo does not have a complete closed protective structure. During the subsequent high pressure molding process, it is prone to displacement, smudging and peeling due to tensile stress. In the coating and cleaning processes, it is prone to discoloration due to chemical corrosion, resulting in poor logo durability. At the same time, the logo screen prints on the uneven textured surface after the transfer texture. Due to the interference of the uneven surface, it is prone to problems such as false printing and poor line reproduction, resulting in poor visual effect of the logo.

[0004] (2) Electronic products have UL94 V-0 flame retardant safety requirements for decorative parts. In order to achieve both light shielding and flame retardancy, the industry directly screen prints flame retardant light shielding ink on the surface of the coating layer. However, the inorganic flame retardant filler in the flame retardant ink will seriously damage the interfacial bonding force between the ink and the coating layer, resulting in extremely poor adhesion between the entire flame retardant layer and the coating layer. In the subsequent high pressure molding process, the flame retardant layer is very easy to peel off and crack, and ultimately cannot simultaneously meet the requirements of stable flame retardant effect and flame retardant layer adhesion reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a flame-retardant decorative part with an inner-layer encapsulated logo and its processing technology, aiming to solve or at least partially solve the shortcomings of the above-mentioned background technology. Through the pre-processing and layered design of the flame-retardant layer, not only is the durability and visual effect of the logo improved, but also the adhesion and flame-retardant performance of the flame-retardant layer are improved.

[0006] This invention provides a processing technology for a flame-retardant decorative part with an inner-layer encapsulated logo, comprising the following steps: S1, Substrate preparation: Selecting a transparent substrate; S2, Logo screen printing: Screen printing a logo on the inner surface of the substrate, followed by baking to form a logo layer, the logo layer being clearly visible through the substrate on the outer surface; S3, Texture transfer: Transferring a texture onto the inner surface of the substrate, followed by curing to form a texture layer covering the logo layer; S4, PVD coating: Applying a PVD coating to the surface of the texture layer to form a coating layer, the coating layer covering the texture layer; S5, Screen printing a flame-retardant layer: Applying a flame-retardant layer to the surface of the coating layer... The process involves screen printing to sequentially form a light-shielding transition layer and a flame-retardant functional layer. The light-shielding transition layer is formed by screen printing with a single layer of ordinary black ink, followed by drying and curing. The flame-retardant functional layer is formed by screen printing with at least one layer of flame-retardant black ink, followed by drying and curing. Step S6: Screen printing release layer: A release gray ink is screen printed onto the flame-retardant functional layer, and after baking, a release layer is formed. Step S7: Cutting and shaping: The substrate obtained in step S6 is cut into multiple sheets. Each sheet is then subjected to high-pressure forming. After forming, the release layer is removed to obtain a semi-finished product. Step S8: CNC machining: The semi-finished product undergoes CNC precision carving. Step S9: Cleaning and inspection: After cleaning and full inspection, the decorative part is obtained.

[0007] Furthermore, the flame-retardant functional layer is formed by screen printing and drying two layers of flame-retardant black ink.

[0008] Further, in step S4, the substrate is placed into the cavity of the magnetron sputtering coating machine, the cavity is evacuated, and the target material is sputtered onto the surface of the textured layer to deposit a coating layer with a visible light transmittance of 67% to 73%.

[0009] Further, after completing step S3, a first protective film is applied to the outer surface of the substrate. The first protective film is used to prevent coating particles during PVD coating from contaminating the outer surface of the substrate. After completing step S4, the first protective film is removed.

[0010] Furthermore, after completing step S5, the flame-retardant functional layer is sanded at least once to improve the adhesion of the release layer to the flame-retardant functional layer. After sanding, the flame-retardant functional layer is cleaned.

[0011] Furthermore, the flame-retardant functional layer is polished three times using 1500-grit sandpaper.

[0012] Furthermore, after completing step S4, a second protective film is applied to the outer surface of the substrate. The second protective film is used to block ink contamination during the screen printing flame retardant layer and release layer processes, while avoiding scratch damage caused by the sanding process and mechanical damage to the outer surface of the substrate caused by the mold during the high-pressure molding process. After completing step S7, the second protective film is removed.

[0013] Furthermore, a coating hardening process is added after step S7 to cover the outer surface of the substrate with a transparent protective layer.

[0014] The present invention also provides a flame-retardant decorative part with an inner-layer encapsulated logo, which is manufactured using the above-mentioned processing technology. The decorative part has a multi-layer composite structure, including a substrate, a logo layer, a texture layer, a coating layer, a light-shielding transition layer, and a flame-retardant functional layer stacked in sequence. The logo layer is disposed on the inner surface of the substrate, and the flame-retardant functional layer is located on the outermost layer. The light-shielding transition layer is a regular black ink layer, and the flame-retardant functional layer is a flame-retardant black ink layer.

[0015] Furthermore, after the hardening process by spray coating, the outer surface of the substrate is covered with a transparent protective layer.

[0016] The present invention provides a processing technology for flame-retardant decorative parts with an inner-layer encapsulated logo. By designing the logo screen printing process before the texture transfer and PVD coating processes, the logo is screen-printed on the inner surface of the substrate. The texture transfer process forms a textured layer covering the logo layer, and the PVD coating forms a coating layer covering the textured layer. This achieves a fully encapsulated protection for the logo layer, preventing issues such as logo shifting, smudging, and peeling during subsequent high-pressure molding processes, as well as preventing discoloration caused by chemical corrosion during subsequent cleaning processes. Furthermore, the logo screen-printed on the smooth inner surface of the substrate... The surface design allows the logo to adhere stably to the substrate without interference from uneven transfer textures, ensuring 100% line reproduction and excellent visual effect. Through the layered design of the flame-retardant layer, a layer of ordinary black ink is directly screen-printed onto the surface of the coating layer to form a light-shielding transition layer. This transition layer not only provides light protection but also ensures stable adhesion of the flame-retardant black ink, completely solving the problem of insufficient adhesion when the flame-retardant black ink is directly bonded to the coating layer. Furthermore, the process flow of this invention is continuous, with strong process synergy, requiring no additional specialized equipment and can be directly implemented on existing production lines, making it widely applicable. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a manufacturing process flow diagram of the processing technology of a flame-retardant decorative part with an inner layer covering a logo according to the present invention.

[0019] Figure 2 This is a flowchart illustrating the processing technology of the flame-retardant layer in this invention.

[0020] Figure 3 This is a flowchart of the processing technology of the release layer in this invention.

[0021] Figure 4 This is a schematic diagram of the multi-layer composite structure of a flame-retardant decorative part with an inner layer covering a logo, according to the present invention.

[0022] The attached diagram lists the components represented by each number as follows: 1. Substrate; 2. Logo layer; 3. Texture layer; 4. Coating layer; 5. Flame retardant layer; 51. Light-shielding transition layer; 52. Flame retardant functional layer; 6. Transparent protective layer. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0024] Unless otherwise explicitly specified and limited, the terms "setup," "installation," and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms based on the specific circumstances.

[0025] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, 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. Therefore, they should not be construed as limitations on the present invention.

[0026] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0027] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0028] It should be noted that, in the embodiments of the present invention, the outer surface of the substrate is the visual appearance surface, which is the side facing the user and which needs to present a decorative effect. The coating and hardening process is carried out on the outer surface of the substrate. The inner surface of the substrate is the non-visual appearance surface, which is the side facing away from the user. Processes such as LOGO silkscreen printing, transfer texture, PVD coating, and silkscreen flame retardant layer are all carried out on the inner surface of the substrate.

[0029] Please see Figures 1-3 This invention provides a processing technology for a flame-retardant decorative part with an inner-layer encapsulated logo, comprising the following steps: S1. Substrate Preparation: A transparent substrate is selected; more specifically, in this embodiment, the substrate is a PMMA / PC double-layer composite board, which is composed of a PMMA (acrylic) layer and a PC (polycarbonate) layer. The surface of the PMMA layer is the outer surface of the substrate, and the surface of the PC layer is the inner surface of the substrate. The PMMA layer has the characteristics of high hardness, excellent scratch resistance, high light transmittance, excellent optical transparency, good surface gloss, and strong weather resistance. The PC layer has the characteristics of good toughness, extremely high impact strength, good heat resistance, and excellent molding and processing performance, and can be adapted to subsequent processing processes such as printing and coating.

[0030] S2. Logo Screen Printing: The logo is screen printed on the inner surface of the substrate using a screen printing machine. Specific process parameters: squeegee hardness 80°, and the working air pressure of the screen printing machine is 5.5 bar to 6.5 bar. After standing for 30 minutes, a baking process is performed to form the logo layer. The specific baking process is as follows: the substrate with the logo screen printed is placed in an oven and baked (80℃, 60 minutes), then allowed to cool naturally for 5 minutes. The logo layer is clearly visible through the substrate on its outer surface.

[0031] S3. Transfer texture: The inner surface of the substrate is transferred using a transfer machine, and after curing, a texture layer is formed covering the logo layer; the curing process here is existing technology and will not be described in detail here.

[0032] S4, PVD Coating: A PVD coating is applied to the surface of the textured layer to form a coating layer that covers the textured layer. More specifically, the substrate after step S3 is placed into the cavity of a magnetron sputtering coating machine, and the vacuum cavity is evacuated to achieve a base vacuum level of 5.0 × 10⁻⁶. -3 Pa, after pre-sputtering cleaning of the target material, the target material is sputtered onto the surface of the textured layer to deposit a coating layer with a visible light transmittance of 67%~73%. After deposition, the substrate is left to stand under pressure and then the vacuum is broken to remove the substrate. In this embodiment, the coating layer is a composite film layer of "zirconium-indium tin layer-niobium oxide".

[0033] S5, Flame-retardant screen printing layer: A screen printing process is performed on the surface of the coating layer to form a light-shielding transition layer and a flame-retardant functional layer in sequence; wherein, the light-shielding transition layer is formed by screen printing and drying with a layer of ordinary black ink, and the flame-retardant functional layer is formed by screen printing and drying with at least one layer of flame-retardant black ink; the light-shielding transition layer and the flame-retardant functional layer are stacked in sequence, and the flame-retardant functional layer is located on the outermost layer.

[0034] S6. Screen Printed Release Layer: Release gray ink is screen printed on the flame-retardant functional layer. After baking, a release layer is formed. The release layer forms a physical barrier between the flame-retardant functional layer and the mold used in the subsequent high-pressure molding process. It is used to temporarily protect the flame-retardant functional layer. On the one hand, the release layer can prevent the flame-retardant functional layer from sticking to the mold during high-pressure molding, which would cause the flame-retardant functional layer to fall off or be damaged. On the other hand, the release layer can prevent chemical substances on the surface of the mold from migrating to the flame-retardant functional layer during high-pressure molding, which would cause the performance of the flame-retardant functional layer to deteriorate.

[0035] S7. Cutting and shaping: Cut the substrate obtained in step S6 into multiple sheets, perform high-pressure molding on each sheet, and remove the release layer after molding to obtain a 3D semi-finished product.

[0036] S8, CNC machining: CNC precision carving of semi-finished products.

[0037] S9. Cleaning and inspection: The decorative parts are obtained after cleaning and full inspection.

[0038] The present invention provides a processing technology for a flame-retardant decorative part with an inner-layer encapsulated logo. By designing the logo screen printing process before the texture transfer and PVD coating processes, the logo is screen-printed on the inner surface of the substrate. The texture transfer process forms a texture layer covering the logo layer, and the PVD coating forms a coating layer covering the texture layer. This achieves a fully encapsulated protection for the logo layer, preventing issues such as logo layer shifting, smudging, and peeling during subsequent high-pressure molding processes, as well as preventing discoloration caused by chemical corrosion of the logo layer during subsequent cleaning processes. Furthermore, the logo screen-printed on the substrate is flat. The inner surface of the coating allows the logo to adhere stably to the substrate without interference from uneven transfer textures, ensuring 100% line reproduction and excellent visual effect. Through the layered design of the flame-retardant layer, a layer of ordinary black ink is directly screen-printed onto the surface of the coating layer to form a light-shielding transition layer. This transition layer not only provides light protection but also ensures stable adhesion of the flame-retardant black ink, completely solving the problem of insufficient adhesion when the flame-retardant black ink is directly bonded to the coating layer. Furthermore, the process flow of this invention is continuous, with strong process synergy, requiring no additional specialized equipment and can be directly implemented on existing production lines, making it widely applicable.

[0039] In this embodiment, the flame-retardant functional layer is formed by screen printing and drying / curing two layers of flame-retardant black ink. The overlapping of these two layers of flame-retardant black ink further enhances the flame-retardant performance of the decorative part, enabling it to meet the UL94 V-0 flame-retardant safety standard requirements. The specific processing steps for the light-shielding transition layer and the flame-retardant functional layer are as follows: S501, Ordinary black ink printing: The substrate obtained in step S4 is screen printed using a screen printing machine, so that ordinary black ink is evenly adhered to the surface of the coating layer; specific process parameters: squeegee hardness 80°, working air pressure of screen printing machine is 5.5 bar~6.5 bar.

[0040] S502, Tunnel Oven Pre-drying: The substrate that has been printed with ordinary black ink is sent into the tunnel oven for pre-drying. The temperature of the tunnel oven is set to 75℃~85℃, and the frequency of the tunnel oven conveyor motor is 30Hz~35Hz. This completes the initial drying of the ink and surface setting, avoiding dripping and smudging.

[0041] S503, Secondary Baking and Cooling: Transfer the pre-baked substrate to an oven for secondary curing and baking at 80℃ for 30 minutes. After baking, allow it to cool naturally for 5 minutes to allow the ink to fully cure and crosslink, achieving stable adhesion and forming a light-shielding transition layer.

[0042] S504, First Flame-Retardant Black Ink Printing: The substrate obtained in step S503 is screen printed using a screen printing machine, so that the flame-retardant black ink is evenly adhered to the surface of the light-shielding transition layer; Specific process parameters: squeegee hardness 80°, working air pressure of the screen printing machine is 5.5 bar~6.5 bar.

[0043] S505, Tunnel Oven Pre-drying: The substrate that has completed the first layer of flame-retardant black ink printing is sent into the tunnel oven for pre-drying. The tunnel oven temperature is set to 75℃~85℃, and the tunnel oven conveyor motor frequency is 30Hz~35Hz. This completes the initial drying of the ink and surface setting, avoiding dripping and smudging.

[0044] S506. Secondary baking and cooling: Transfer the pre-baked substrate into an oven for secondary curing and baking at 80℃ for 30 minutes. After baking, allow it to cool naturally for 5 minutes to allow the ink to fully cure and cross-link, thus obtaining stable adhesion performance.

[0045] S507, Second layer of flame-retardant black ink printing: The substrate obtained in step S506 is screen printed using a screen printing machine, so that the flame-retardant black ink is evenly adhered to the surface of the first layer of flame-retardant black ink; Specific process parameters: squeegee hardness 80°, working air pressure of screen printing machine is 5.5 bar~6.5 bar.

[0046] S508, Tunnel Oven Pre-drying: The substrate that has completed the second flame-retardant black ink printing is sent into the tunnel oven for pre-drying. The tunnel oven temperature is set to 75℃~85℃, and the tunnel oven conveyor motor frequency is 30Hz~35Hz. This completes the initial drying of the ink and surface setting, avoiding dripping and smudging.

[0047] S509. Secondary baking and cooling: Transfer the pre-baked substrate into an oven for secondary curing and baking at 80℃ for 60 minutes. After baking, allow it to cool naturally for 5 minutes to allow the ink to fully cure and crosslink, achieving stable adhesion and forming a flame-retardant functional layer.

[0048] In this embodiment, the specific processing steps of the release layer are as follows: S601, Demolding Gray Ink Printing: The substrate obtained in step S509 is screen printed using a screen printing machine to make the demolding gray ink evenly adhere to the surface of the flame-retardant functional layer; specific process parameters: squeegee hardness 80°, working air pressure of the screen printing machine is 5.5 bar~6.5 bar.

[0049] S602, Tunnel Oven Pre-drying: The substrate with the completed demolding and gray ink printing is sent into the tunnel oven for pre-drying. The tunnel oven temperature is set to 75℃~85℃, and the tunnel oven conveyor motor frequency is 30Hz~35Hz. This completes the initial drying of the ink and surface setting, avoiding dripping and smudging.

[0050] S603, Secondary Baking and Cooling: Transfer the pre-baked substrate to an oven for secondary curing and baking at 80℃ for 90 minutes. After baking, allow it to cool naturally for 5 minutes to allow the ink to fully cure and crosslink, achieving stable adhesion and forming a release layer.

[0051] Furthermore, after completing step S3, a first protective film is applied to the outer surface of the substrate using a laminating machine. The first protective film is used to prevent coating particles during PVD coating from contaminating the outer surface of the substrate. After completing step S4, the first protective film is removed.

[0052] In the PVD coating process, the core requirements for the first protective film are temperature resistance (160℃~200℃), low outgassing, and no adhesive overflow. The first protective film can be either a PI film or a PEEK film.

[0053] Among them, PI film can withstand high temperatures of 260℃ for a long time and is stable without gas release under vacuum. PEEK film has the best high temperature resistance and vacuum stability, and is stable without gas release or deformation under vacuum, but its cost is higher than that of PI film, making it unsuitable for mass production at low cost. Therefore, in this embodiment, a PI film with a thickness of 25μm~50μm is selected as the first protective film.

[0054] Furthermore, after completing step S5, the flame-retardant functional layer is sanded at least once to improve the adhesion of the release layer to the flame-retardant functional layer. After sanding, the flame-retardant functional layer is cleaned to prevent secondary contamination.

[0055] In this embodiment, the flame-retardant functional layer is sanded three times using 1500-grit sandpaper. The first sanding is to quickly remove loose powder and low-adhesion particles from the surface of the flame-retardant functional layer, thereby exposing its stable ink body surface and improving the adhesion of the release layer to the flame-retardant functional layer. The second sanding is to form a uniform and fine micro-rough structure on the surface of the flame-retardant functional layer, thereby significantly increasing the mechanical anchoring area and further improving the adhesion of the release layer to the flame-retardant functional layer. The third sanding is to eliminate any local unevenness in depth that may have occurred on the surface of the flame-retardant functional layer during the first two sandings, ensuring that the release layer for subsequent screen printing is continuous and uniform, thus avoiding indentations or even damage to the outer surface of the substrate caused by unevenness of the release layer surface during subsequent high-pressure molding.

[0056] Furthermore, after completing step S4, a second protective film is applied to the outer surface of the substrate using a laminating machine. The second protective film is used to block ink contamination during the screen printing flame retardant layer and release layer processes, while also avoiding scratch damage caused by the sanding process and mechanical damage to the outer surface of the substrate caused by the mold during the high-pressure molding process. After completing step S7, the second protective film is removed.

[0057] The core requirements for the second protective film are resistance to ink penetration, strong scratch resistance, and temperature resistance (130℃~160℃). The second protective film can be either PI film or PEEK film.

[0058] Among them, PI film has excellent barrier properties, scratch and wear resistance, and can withstand high temperatures of 260℃ for a long time. PEEK film also has excellent combination performance, scratch resistance, and high temperature resistance, but its cost is higher than that of PI film, making it unsuitable for large-scale, low-cost mass production. Therefore, in this embodiment, a PI film with a thickness of 12.5μm to 50μm is selected as the second protective film.

[0059] In this invention, the first protective film and the second protective film are adapted to the protection requirements of one or more corresponding processes. They are removed after the process is completed to avoid protection failure and cross-contamination caused by the use of the protective film throughout the entire process.

[0060] Furthermore, a hardening coating process is added after step S7 to cover the outer surface of the substrate with a transparent protective layer. This transparent protective layer not only enhances the wear resistance, scratch resistance, weather resistance, and fingerprint resistance of the decorative parts, but also improves their gloss and visual texture. The specific preparation process of the transparent protective layer is as follows: a hardening liquid is evenly distributed using a coating device to form a continuous and dense coating curtain, ensuring the hardening liquid completely covers the outer surface of the substrate. Subsequently, a UV curing process is used to cure the hardening liquid, forming a high-hardness, dense protective layer on the outer surface of the substrate. In this embodiment, the hardening liquid is a UV-curable polyurethane acrylate hardening liquid.

[0061] In the prior art, the above-mentioned coating hardening process is generally carried out after the CNC machining process. However, the 3D semi-finished product after CNC precision carving has formed a final shape with sharp edges and concave contours. During the coating hardening process, the thickness of the transparent protective layer on the outer surface of the substrate is insufficient and the uniformity is poor. In addition, performing CNC machining first can easily scratch the outer surface of the substrate, resulting in product defects.

[0062] This invention employs a reverse process: first, a complete 3D semi-finished product after high-pressure molding undergoes overall coating hardening, followed by CNC machining. Compared to existing technologies, this process offers significant advantages: Firstly, during coating hardening, the semi-finished product retains its process edges, avoiding sharp corners and complex concave contours. The hardening liquid can flow evenly on the outer surface of the substrate, effectively preventing issues such as insufficient thickness and uneven distribution of the transparent protective layer at the edges. This ensures consistent thickness of the transparent protective layer on both flat and curved surfaces, improving product yield. Secondly, the transparent protective layer effectively prevents scratches and corrosion of the substrate's outer surface by tools, cutting debris, and processing waste liquid during subsequent CNC precision carving, eliminating processing damage at the source and significantly reducing product defect rates. Finally, the outer surface of the substrate is completely covered by the transparent protective layer, with no exposed substrate, greatly enhancing the wear resistance, scratch resistance, and overall protection of the decorative parts.

[0063] In addition, the present invention also provides a flame-retardant decorative part with an inner-layer covered logo, which is manufactured using the processing technology described in the above embodiments.

[0064] Please see Figure 4 The decorative component has a multi-layer composite structure, including a substrate 1, a logo layer 2, a texture layer 3, a coating layer 4, a light-shielding transition layer 51, and a flame-retardant functional layer 52 stacked in sequence. The logo layer 2 is located on the outer surface of the substrate 1, and the flame-retardant functional layer 52 is located on the outermost layer. The light-shielding transition layer 51 is a regular black ink layer, and the flame-retardant functional layer 52 is a flame-retardant black ink layer.

[0065] Furthermore, in this embodiment, the flame-retardant functional layer 52 is composed of two layers of flame-retardant black ink.

[0066] Furthermore, after the hardening process of spray coating, the outer surface of the substrate 1 is covered with a transparent protective layer 6, which greatly improves the wear resistance, scratch resistance and overall protection of the decorative parts.

[0067] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A processing technology for a flame-retardant decorative part with an inner-layer encapsulated logo, characterized in that, Includes the following steps: S1. Substrate preparation: Select a transparent substrate; S2, LOGO silkscreen printing: LOGO silkscreen printing is performed on the inner surface of the substrate, and a LOGO layer is formed after baking. The LOGO layer is clearly visible through the substrate on the outer surface of the substrate. S3, Transfer texture: The inner surface of the substrate is transferred with texture, and after curing, a texture layer is formed covering the LOGO layer. S4, PVD coating: A PVD process is used to coat the surface of the texture layer to form a coating layer, which covers the texture layer. S5, Flame-retardant screen printing layer: A layered screen printing process is performed on the surface of the coating layer to sequentially form a light-shielding transition layer and a flame-retardant functional layer; wherein, the light-shielding transition layer is formed by screen printing and drying with a layer of ordinary black ink, and the flame-retardant functional layer is formed by screen printing and drying with at least one layer of flame-retardant black ink. S6. Screen Printed Release Layer: Gray release ink is screen printed on the flame-retardant functional layer, and a release layer is formed after baking. S7. Cutting and shaping: Cut the substrate obtained in step S6 into multiple sheets, perform high-pressure molding on each sheet, and after molding, remove the release layer to obtain a semi-finished product. S8. CNC machining: Perform CNC precision carving on the semi-finished product; S9. Cleaning and inspection: The decorative parts are obtained after cleaning and full inspection.

2. The processing technology of the flame-retardant decorative part with an inner-layer encapsulated logo as described in claim 1, characterized in that, The flame-retardant functional layer is formed by screen printing and drying / curing two layers of flame-retardant black ink.

3. The processing technology of the flame-retardant decorative part with an inner-layer encapsulated logo as described in claim 1, characterized in that, In step S4, the substrate is placed into the cavity of the magnetron sputtering coating machine, the cavity is evacuated, and the target material is sputtered onto the surface of the textured layer to deposit the coating layer with a visible light transmittance of 67% to 73%.

4. The processing technology of the flame-retardant decorative part with an inner-layer encapsulated logo as described in claim 1, characterized in that, After completing step S3, a first protective film is applied to the outer surface of the substrate. The first protective film is used to prevent coating particles during PVD coating from contaminating the outer surface of the substrate. After completing step S4, the first protective film is removed.

5. The processing technology of the flame-retardant decorative part with an inner-layer encapsulated logo as described in claim 1, characterized in that, After completing step S5, the flame-retardant functional layer is polished at least once to improve the adhesion of the release layer to the flame-retardant functional layer. After polishing, the flame-retardant functional layer is cleaned.

6. The processing technology of the flame-retardant decorative part with an inner-layer encapsulated logo as described in claim 5, characterized in that, The flame-retardant functional layer was polished three times using 1500-grit sandpaper.

7. The processing technology of the flame-retardant decorative part with an inner-layer encapsulated logo as described in claim 5, characterized in that, After completing step S4, a second protective film is applied to the outer surface of the substrate. The second protective film is used to block ink contamination in the screen printing flame retardant layer and release layer processes, while avoiding scratch damage caused by the polishing process and mechanical damage to the outer surface of the substrate caused by the mold in the high pressure forming process. After completing step S7, the second protective film is removed.

8. The processing technology of the flame-retardant decorative part with an inner-layer encapsulated logo as described in claim 1, characterized in that, After step S7, a coating hardening process is added to cover the outer surface of the substrate with a transparent protective layer.

9. A flame-retardant decorative part with an inner-layer encapsulated logo, manufactured using the processing technology described in any one of claims 1 to 8, characterized in that, The decorative component is a multi-layer composite structure, including a substrate, a logo layer, a texture layer, a coating layer, a light-shielding transition layer, and a flame-retardant functional layer stacked in sequence. The logo layer is disposed on the inner surface of the substrate, and the flame-retardant functional layer is located on the outermost layer. The light-shielding transition layer is a regular black ink layer, and the flame-retardant functional layer is a flame-retardant black ink layer.

10. The flame-retardant decorative component with an inner-layer encapsulated logo as described in claim 9, characterized in that, The substrate is prepared using the processing technology described in claim 8, and the outer surface of the substrate is covered with a transparent protective layer.

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