Preparation method of integrated light-emitting identifier based on PUR packaging

Abstract

The invention provides a light-emitting identification manufacturing method of an integrated light-emitting identification based on PUR packaging, which comprises the following steps: S1, manufacturing a PUR shell, and manufacturing a shell body with crystal texture by using a reactive polyurethane PUR material through a reaction injection molding process; s2, a light source module is embedded, and the LED light source module prepared in advance is placed in the containing cavity of the PUR shell; s3, packaging treatment is conducted, liquid PUR glue or epoxy resin glue is injected into the PUR shell, reaction curing is conducted under the condition of the normal temperature or the preset heating temperature, the light source module is packaged in the PUR shell, and a packaging layer is formed; and S4, double-faced adhesive tape is pasted on the back face of the packaging layer, and the vehicle logo assembly is completed. The car logo has the advantages that the car logo structure is light, thin and seamless, and the car logo has the integrally-formed high-light-transmittance crystal texture.

Description

Technical Field

[0001] This invention relates to the field of vehicle identification technology, and specifically to a method for preparing an integrated luminous identification based on PUR encapsulation. Background Technology

[0002] With the development of the automotive industry, car logos have become not only symbols of brand identity but also an important part of vehicle exterior design and technological appeal. Illuminated car logos are highly favored due to their excellent visibility at night or in low-light conditions.

[0003] Currently, most illuminated car emblems on the market are assembled from components. They typically include: a metal or plastic housing as a base, a light source (such as an LED panel) inside the housing, a transparent or semi-transparent light guide plate, and an outermost decorative cover. These components are assembled one by one using snaps, adhesives, or screws. The overall structure is relatively thick and heavy, and over time, there is a risk of yellowing, dust accumulation, and moisture buildup. Specific disadvantages are as follows:

[0004] 1. Heavy structure and large size: The stacked multi-layer structure increases the overall thickness and weight of the car logo, which contradicts the modern car's pursuit of a thin and streamlined design concept. It also increases the space occupied by the logo on the front or rear of the vehicle.

[0005] 2. Seams and Defects: Dust and moisture can easily accumulate at the assembly seams between components, affecting aesthetics and potentially leading to abnormal noises or loosening after long-term use. Light leakage at the seams is also difficult to completely avoid, affecting the uniformity of light emission.

[0006] 3. Poor Texture: The outer layer is typically injection-molded from PMMA (acrylic) or PC (polycarbonate). These materials have limited hardness, scratch resistance, and chemical corrosion resistance, and their surfaces are easily scratched. More importantly, it is difficult to achieve a truly crystal-clear, full, and high-gloss texture in a single injection molding process. Subsequent polishing, clear varnishing, or UV coating are usually required, which not only increases production steps and costs but also makes the coating prone to yellowing, cracking, and peeling under complex outdoor environments (such as UV rays, high and low temperatures, and car wash liquids), failing to maintain a high-quality appearance over time.

[0007] 4. Sealing and Reliability: The sealing of multi-layer assembly structures relies on sealing rings or adhesives. After long-term exposure to vehicle vibration, high and low temperature cycles, and rainwater erosion, there is a risk of seal failure leading to internal water ingress, which may cause short circuits, light decay, or even damage to the light source. Summary of the Invention

[0008] In view of the above problems, the purpose of this invention is to provide a method for preparing an integrated luminous logo based on PUR packaging, which can achieve a thin, seamless, and integrally molded high-transmittance crystal texture for the vehicle logo structure, thereby overcoming the shortcomings of the prior art.

[0009] This invention provides a method for manufacturing an integrated luminous sign based on PUR packaging, comprising the following steps:

[0010] Step S1: Fabricate the PUR shell by using reactive polyurethane (PUR) material to create a crystal-like outer shell through a reaction injection molding process.

[0011] Step S2: Embed the light source module by placing the pre-prepared LED light source module into the receiving cavity of the PUR housing;

[0012] Step S3: Encapsulation process. Liquid PUR adhesive or epoxy resin is injected into the PUR shell and cured under normal temperature or preset heating temperature to encapsulate the light source module in the PUR shell and form an encapsulation layer.

[0013] Step S4: Apply double-sided tape to the back of the encapsulation layer to complete the car logo assembly.

[0014] The second objective of this invention is to provide a method for manufacturing an integrated luminous sign based on PUR packaging, comprising the following steps:

[0015] Step S1: Attach the front-emitting surface light source module to the PC film;

[0016] Step S2: Place the light source module with the PC film into the PUR reaction injection molding mold for PUR reaction injection molding, and then encapsulate it with a surface crystal effect.

[0017] Step S3: Perform CNC milling on the packaged light source module;

[0018] Step S4: Apply adhesive backing to the back of the milled PUR housing to complete the production of the car logo.

[0019] The third objective of this invention is to provide a method for manufacturing an integrated luminous sign based on PUR packaging, comprising the following steps:

[0020] Step S1: PUR Reactive Injection Molding. Using reactive polyurethane (PUR) material, a crystal-like outer shell is made through a reactive injection molding process, completing the production of the PUR shell.

[0021] Step S2: Injection molding of PC+ABS base shell. PC+ABS material is placed into the mold and injection molded into the base shell to complete the production of PC+ABS base shell;

[0022] Step S3: Place the light guide module and the side-emitting light source module into the PUR housing in sequence;

[0023] Step S4: Place the PUR shell with the light source module and the PC+ABS bottom shell into the ultrasonic welding mold, perform ultrasonic welding and encapsulation, and complete the production of the car logo shell.

[0024] Step S5: Apply adhesive backing to the back of the car logo shell to complete the production of the illuminated car logo.

[0025] The advantages and positive effects of this invention are:

[0026] 1. This invention achieves integrated seamless packaging. Through PUR reaction injection molding, the traditional multi-part assembly is simplified into a whole, completely eliminating seams and avoiding problems such as dust accumulation, water leakage and light leakage, making the structure more reliable.

[0027] 2. This invention achieves an ultimate crystal texture. Due to the high transmittance and gloss of the high-transmittance optical grade PUR material, the surface is crystal clear after curing, and the texture is far superior to that of traditional PMMA / PC materials. Moreover, it can achieve high-end appearance requirements without subsequent spraying or coating.

[0028] 3. This invention has excellent weather resistance and durability. PUR material naturally has excellent impact resistance, wear resistance, chemical corrosion resistance and UV yellowing resistance, and can withstand harsh outdoor environments for a long time, maintaining a new appearance and optical performance for a long time.

[0029] 4. This invention has excellent sealing and protection properties. The PUR material is firmly bonded to the substrate such as the shell and light guide, forming a perfect airtight and watertight seal, providing the highest level of protection for the internal light source module and circuit. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an integrated luminous sign based on PUR packaging provided in Embodiment 2.

[0031] Figure 2 This is a schematic diagram of an integrated luminous sign based on PUR packaging provided in Embodiment 3.

[0032] Figure 3 This is a schematic diagram of an integrated luminous sign based on PUR packaging provided in Embodiment 4.

[0033] Figure description: 1. PUR encapsulation layer, 2. Light source module, 3. Back seal layer, 4. PVD electroplating layer, 5. 3M adhesive backing layer, 6. Reflective sheet layer, 7. Light guide plate layer, 8. Light diffuser layer. Detailed Implementation

[0034] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0035] Example 1

[0036] This embodiment of an integrated luminous sign based on PUR encapsulation includes: an encapsulation shell and a light source module. The encapsulation shell is an integrally molded PUR (reactive polyurethane) encapsulation layer 1. The PUR encapsulation layer 1 is injection molded from reactive polyurethane and surrounds the front and sides of the light source module 2. A back seal layer 3 is provided on the back of the light source module 2. A PVD electroplating layer 4 is provided between the light source module 2 and the inner wall of the PUR encapsulation layer 1. A 3M adhesive backing layer 5 is provided on the side of the back seal layer 3 away from the light source module 2. The back seal layer 3 is one or more of PUR back seal layer, epoxy back seal layer, PC film, and PC+ABS back seal layer. A luminous car logo is provided on the encapsulation shell. A reflective sheet layer 6, a light guide plate layer 7, and a light diffuser layer 8 are sequentially provided between the back of the light source module 2 and the back seal layer 3. The reflective sheet layer 6 is located on the side closer to the back of the light source module 2.

[0037] In this embodiment, the PUR encapsulation layer 1 is made of high-transmittance optical-grade PUR material with an Abbe number greater than 30, light transmittance greater than 98%, Shore D hardness greater than 80, and excellent resistance to UV yellowing and hydrolysis.

[0038] Example 2

[0039] This embodiment provides a method for manufacturing an integrated luminous sign based on PUR packaging, including the following steps:

[0040] Step S1: Fabricate the PUR shell by using reactive polyurethane (PUR) material to create a crystal-like outer shell through a reaction injection molding process.

[0041] Step S2: Embed the light source module by placing the pre-prepared LED light source module into the receiving cavity of the PUR housing;

[0042] Step S3: Encapsulation process. Liquid PUR adhesive or epoxy resin is injected into the PUR shell and cured under normal temperature or preset heating temperature to encapsulate the light source module in the PUR shell and form an encapsulation layer.

[0043] Step S4: Apply double-sided tape to the back of the encapsulation layer to complete the car logo assembly.

[0044] Example 3

[0045] This embodiment provides a method for manufacturing an integrated luminous sign based on PUR packaging, including the following steps:

[0046] Step S1: Attach the front-emitting surface light source module to the PC film;

[0047] Step S2: Place the light source module with the PC film into the PUR reaction injection molding mold for PUR reaction injection molding, and then encapsulate it with a surface crystal effect.

[0048] Step S3: Perform CNC milling on the packaged light source module;

[0049] Step S4: Apply adhesive backing to the back of the milled PUR housing to complete the production of the car logo.

[0050] Example 4

[0051] This embodiment provides a method for manufacturing an integrated luminous sign based on PUR packaging, including the following steps:

[0052] Step S1: PUR Reactive Injection Molding. Using reactive polyurethane (PUR) material, a crystal-like outer shell is made through a reactive injection molding process, completing the production of the PUR shell.

[0053] Step S2: Injection molding of PC+ABS base shell. PC+ABS material is placed into the mold and injection molded into the base shell to complete the production of PC+ABS base shell;

[0054] Step S3: Place the light guide module and the side-emitting light source module into the PUR housing in sequence;

[0055] Step S4: Place the PUR shell with the light source module and the PC+ABS bottom shell into the ultrasonic welding mold, perform ultrasonic welding and encapsulation, and complete the production of the car logo shell.

[0056] Step S5: Apply adhesive backing to the back of the car logo shell to complete the production of the illuminated car logo.

[0057] The above are merely specific embodiments 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 method for manufacturing an integrated luminous sign based on PUR packaging, characterized in that, Includes the following steps: Step S1: Fabricate the PUR shell by using reactive polyurethane (PUR) material to create a crystal-like outer shell through a reaction injection molding process. Step S2: Embed the light source module by placing the pre-prepared LED light source module into the receiving cavity of the PUR housing; Step S3: Encapsulation process. Liquid PUR adhesive or epoxy resin is injected into the PUR shell and cured under normal temperature or preset heating temperature to encapsulate the light source module in the PUR shell and form an encapsulation layer. Step S4: Apply double-sided tape to the back of the encapsulation layer to complete the car logo assembly.

2. A method for manufacturing an integrated luminous sign based on PUR packaging, characterized in that, Includes the following steps: Step S1: Attach the front-emitting surface light source module to the PC film; Step S2: Place the light source module with the PC film into the PUR reaction injection molding mold for PUR reaction injection molding; Step S3: Perform CNC milling on the packaged light source module; Step S4: Apply adhesive backing to the back of the milled PUR housing to complete the production of the car logo.

3. A method for manufacturing an integrated luminous sign based on PUR packaging, characterized in that, Includes the following steps: Step S1: PUR Reactive Injection Molding. Using reactive polyurethane (PUR) material, a crystal-like outer shell is made through a reactive injection molding process, completing the production of the PUR shell. Step S2: Injection molding of PC+ABS base shell. PC+ABS material is placed into the mold and injection molded into the base shell to complete the production of PC+ABS base shell; Step S3: Place the light guide module and the side-emitting light source module into the PUR housing in sequence; Step S4: Place the PUR shell with the light source module and the PC+ABS bottom shell into the ultrasonic welding mold, perform ultrasonic welding and encapsulation, and complete the production of the car logo shell. Step S5: Apply adhesive backing to the back of the car logo shell to complete the production of the illuminated car logo.

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