Since the advent of the automobile in 1886, the automotive interior parts industry has undergone more than a century of development, experiencing three phases: the initial stage, the functionalist stage, and the humanistic era. Currently, vehicle interiors have become a crucial factor for consumers when purchasing a car. The automotive market now demands increasingly higher comprehensive standards for interior products, and with the booming development of the automotive market, the market size of the automotive interior parts industry is also growing rapidly. The market size of China's automotive interior parts is expected to rise from 231.1 billion yuan in 2024 to 276.5 billion yuan in 2029, indicating significant growth potential.

With the continuous development of technology and the increasing demands of consumers for automotive quality and comfort, the technological content and manufacturing difficulty of automotive interior components are gradually increasing. The application of new materials, new processes, and intelligent technologies improves the performance and quality of interior components while also increasing their cost. As the level of automotive intelligence improves, the number of components such as display systems, connectivity systems, and audio systems in the cockpit is constantly increasing, requiring automotive interior components to provide multiple functions such as intelligent control, human-machine interaction, and infotainment.

To meet the aforementioned demands for interior components, the automotive interior industry is continuously upgrading its processes, materials, design, and functionality, leading to a sustained increase in the value of automotive interior components per vehicle. Looking ahead, as consumers further enhance their demands for interior comfort and technological sophistication, interior component manufacturers will need to continuously strengthen their investment in technological innovation, product upgrades, and environmental protection. Consequently, the proportion of automotive interior component value in the overall vehicle cost is likely to continue its upward trend.

Automotive interiors include interior coverings such as dashboards, door panels, roof panels, pillar panels, and side panels. In a broader sense, they also include interior functional components such as steering wheels, car seats, and floor mats.

Automotive interiors achieve different effects through a variety of materials and manufacturing processes. Common interior materials include plastics such as ABS, modified PP, and PC, as well as various composite materials such as leather, flocked fabric, foam, and fiberglass. Unlike the exterior, which primarily serves an aesthetic purpose, the interior is directly related to the driving and passenger experience.

The design of automotive interiors, including styling, material comfort, layout, and suitability for user habits, directly impacts the user experience. Automotive interior design must prioritize meeting diverse human needs, achieving both passenger comfort and driving safety while also being aesthetically pleasing. With the development of my country's automotive industry, the design, manufacturing processes, and costs of automotive interiors have become key concerns for many automakers, and the surface finish of automotive interiors has become one of the criteria consumers use when choosing a car.

Traditional manufacturing processes for automotive interior parts mainly involve spraying, electroplating, and screen printing. These processes require removing the injection-molded parts from the mold cavity and then performing secondary processing, resulting in long production cycles, mediocre decorative effects, and high pollution. The development of automotive interior parts manufacturing processes with richer patterns and colors, and more environmentally friendly and efficient processes, along with corresponding material research and development, has become the main trend in the technological development of the automotive interior parts industry. The development history of the main surface decoration processes for automotive interior parts is as follows:

As shown in the figure above, in recent years, the more advanced automotive interior surface manufacturing processes in the industry are in-mold decoration (IMD) and in-mold inlay (INS). In-mold decoration (IMD) is a popular plastic surface decoration technology internationally, mainly including in-mold heat transfer injection molding (IMR) and in-mold labeling (IML).

In automotive interiors, IMD products generally utilize the IMR process. The IMR process involves rolling a printed film into a roller, installing it into an injection molding machine, and then using a film feeder to bond the film to the mold cavity for injection molding. After injection molding, the ink layer separates from the film, leaving the patterned ink layer on the plastic part, while the separating film merely acts as a carrier. Unlike IMR products,IMLThe product's surface is a hardened transparent film, the middle layer is a pattern printing layer, and the bottom layer is a plastic layer.

Because the printed ink is sandwiched in the middle, it prevents the product surface from being scratched and maintains the color's vibrancy and resistance to fading for a long time. Currently, in automotive interior IMD products, most decorative strips and covers use IMR technology, while a small number of center console panels with display functions, dashboard ambient lighting, and door panel trims are gradually starting to use IML technology.

Compared to traditional plastic decoration techniques such as spray painting, hot stamping, heat transfer printing, and pad printing, IMD technology offers higher production efficiency, more aesthetically pleasing and diverse products, and superior surface stability and weather resistance. IMD technology solves the problem of products with complex shapes and large curves requiring unique appearances. Applications include dashboard trims, door trims, ashtray covers, and air conditioning panels.

Insert molding decoration technology involves inserting a pre-formed film into an injection mold and molding it into shape. This process generally consists of three steps: vacuum forming, die cutting, and injection molding. After injection molding, the film and plastic fuse together, with the wear-resistant material on the outermost layer.

The plastic materials are mostly PC and PMMA (acrylic).PBTMaterials such as polybutylene terephthalate (PET) primarily provide wear and scratch resistance. INS products have a hard film protecting the surface, making them smooth, wear-resistant, and resistant to fading. Automobile manufacturing is a significant indicator of industrial development; its progress reflects the advancement of the entire manufacturing industry. The interior manufacturing process in automobile manufacturing involves numerous advanced manufacturing techniques.

In addition to the processes mentioned above, automotive interior surface decoration technologies also include relatively traditional injection molding, painting, wrapping, electroplating, hot stamping, laser engraving, and leather texture etching, as well as relatively high-end real wood craftsmanship, real aluminum craftsmanship, 3D hot stamping craftsmanship, and intelligent interior surface decoration technologies that match the current new trends in intelligent interior development, such as dual-color IMD, dual-color INS, and tactile interior.

A single automotive interior component may involve two or more manufacturing processes, with different vehicles employing different processes based on their market positioning. In summary, the development of automotive interior component manufacturing processes has been a continuous process of innovation and evolution. With technological advancements and increasing market demands, the manufacturing processes for automotive interior components will continue to evolve towards greater environmental friendliness, sustainability, intelligence, and personalization.

1) The development trend of the "new four modernizations" of automobiles is driving the development of automotive interior components towards intelligence and functionality.

In recent years, with the advancement of technology and the increasing prevalence of 5G and the Internet of Things, automobiles have begun to transform towards electrification, connectivity, intelligence, and sharing, and the automotive industry has entered a period of profound transformation. Intelligence is a key element in these four trends, and the intelligent cockpit is the concrete realization of intelligence within the vehicle's interior space.

The smart cockpit integrates intelligent and connected technologies, providing drivers and passengers with a safer, more comfortable, and convenient driving experience through deep integration of software and hardware. In the smart cockpit, automotive trim may utilize smart surface technology, integrating sensors, actuators, and communication modules to enable various interaction methods such as touch sensing, gesture control, or voice commands.

These smart surfaces can be applied to components such as seats, steering wheels, and center consoles to enhance the driving and riding experience. Some trim pieces may have environmental sensing capabilities, automatically adjusting material properties or color changes based on parameters such as interior temperature and humidity to provide a more comfortable driving environment. Furthermore, intelligent interiors typically include ambient lighting design, allowing owners to choose the color and brightness of the ambient lighting to create a unique in-car atmosphere.

Furthermore, some ambient lighting options support intelligent control functions, such as changing color according to music rhythm and adjusting brightness with vehicle speed, enhancing driving pleasure and safety. According to data from the China Association of Automobile Manufacturers, my country may achieve more complex autonomous driving scenarios between 2025 and 2030, and by 2040, three-quarters of vehicles on the road will be intelligent driving vehicles. Regarding vehicle connectivity, the number of connected cars globally is expected to approach 74 million by 2025, with 28 million of those in my country. With the accelerating pace of the "new four modernizations" of automobiles and the deepening development of intelligent driving technology, various technologically advanced interior products will be more widely promoted and applied. The demand for comfort and intelligence in automotive interior components will continue to grow, bringing greater development opportunities to the interior component industry.

2) Consumers' growing demand for personalization is driving the development of automotive interior parts towards personalization and customization.

In the future, consumers' demands for automotive interior components will become increasingly diversified. They hope to express their individuality and taste through personalized and customized automotive interior designs, making personalization and customization a significant trend in the automotive interior component industry. Through further development of digital technology and intelligent manufacturing, interior component manufacturers can achieve more efficient personalized production to meet consumers' customized needs.

Consumers can choose interior colors, materials, textures, and other exterior options according to their personal preferences, and even customize patterns, such as a starry sky headliner or a pattern on the seat fabric, making the interior space more personalized and artistic. In addition, consumers can also personalize aspects such as functional layout and intelligent features.

For example, users can personalize the quantity, orientation, and shape of seats, tables, chairs, and electronic displays on a mobile app according to their needs, fulfilling requirements for various scenarios such as business meetings, dining with friends, and family chats. Personalization and customization of automotive interior design will become one of the key areas of competition for automotive brands in the future.

By offering customized interior design solutions, automakers can further enhance their brand value and influence, meet the diverse needs of different consumer groups, attract more consumers, and further expand their market share.

3) The development of lightweight automobiles is driving the upgrading of materials and processes, and automotive interior parts are developing towards lightweight and environmentally friendly directions.

Lightweighting of automobiles is crucial for reducing fuel and electricity consumption, especially for new energy vehicles facing range anxiety, where the need for weight reduction is even more urgent. According to publicly available data, for every 10% reduction in weight, the driving range of new energy vehicles can increase by 5%-6%; and the fuel consumption of gasoline vehicles will decrease by 6%-8%.

Automotive lightweight design primarily involves three aspects: structural optimization, advanced technologies, and material replacement. The application of new lightweight technologies is expected to become a new growth driver for the company's business. Structural optimization includes dimensions, shape, and...Topology optimizationWeight reduction can be achieved through structural design principles; advanced technology can reduce material forming processes; and material replacement is currently the most important method for weight reduction. Polyurethane foam composite roofs can reduce weight by 30%.

Fiber-reinforced materials are corrosion-resistant, impact-resistant, and offer good sound insulation, making them promising candidates for further weight reduction. Lightweight components, represented by plastic parts, are gradually replacing traditional metal parts due to their lower density and superior performance characteristics. "Replacing steel with plastic" has become a crucial direction for the transformation and upgrading of the automotive interior parts industry. In the future, with increasingly stringent environmental requirements and advancements in material processing, the value of individual vehicle interior components still has room for growth.

Content source: Qidian Interior and Exterior Decoration

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