Talking About Automotive Injection Mold in China

Briefly introduce the current situation of the automotive industry
According to data from the International Association of Automobile Manufacturers, global car sales will reach 90 million units in 2023. Some data indicate that China, the United States, and Europe are the largest consumer markets for cars in the world. In the past decade, the Chinese car market has grown rapidly, becoming the world’s largest automobile market, with sales in the Chinese market accounting for about 25%, while the United States accounts for about 19% of the world’s automobile sales, and Europe accounts for about 12%.

The application of plastic products in the automotive industry
In recent years, with the light weighting and environmental protection of automobile material technology, more and more automobiles use plastic parts instead of metal parts. Automotive plastics have a relatively low density. Using plastic instead of steel to make exterior parts can reduce the weight of the car and achieve energy saving. Reducing the mass of the vehicle itself is one of the most effective measures to reduce vehicle emissions and improve combustion efficiency. According to estimates, every 10% reduction in the weight of the car can reduce fuel consumption by 6% to 8%.

Further substitution and upgrading of materials in traditional automotive lightweight technology is the main direction of current automotive light weighting.
The amount of plastic used in automobiles has even become an important indicator of the level of automobile design and manufacturing. The plastic material used in the entire vehicle has increased from 100kg in the year 1990 to 230kg, accounting for more than 15% of the total vehicle materials.

In addition to being lightweight, thermally insulating, soundproofing, shock-absorbing and cheap, plastics have also been found to have more favorable properties for the development of the automotive industry in long-term applications, such as:
·Less corrosion, extending vehicle service life
·Rich design that integrates advanced creativity and innovation with the vehicle
·Flexibility of integrated components
·Safety, comfort and economy

Which car parts are made of plastic?
The plastic interior and exterior parts that we are familiar with include visible bumpers, grilles, wheel covers, license plates, instrument panels, door panels, knobs, fenders, etc., there are even LCD panels, tail blockers, engine inner covers, bearings, gaskets, seals, Various parts and electronic components such as clutch ring gears and automobile transmission, braking and air-conditioning systems have become routine configurations.

The plasticization of some auto parts can not only bring about lightweight improvements, but also has functional advantages compared to metal auto parts. For example, plastic intake manifolds. Due to the complex shape of the manifold, casting with aluminum alloy will inevitably increase the roughness of the inner wall, which will increase air resistance and lead to problems such as loud noise, insufficient combustion, and excessive exhaust gas emissions.

Since PA has lower thermal conductivity than aluminum, the fuel nozzle and incoming air temperatures are lower. It can not only improve the hot start performance, increase the power and torque of the engine, but also avoid the heat loss in the tube to a certain extent during cold start and accelerate the increase of gas temperature. The inner wall of the plastic intake manifold is smooth, which can reduce the air flow resistance, thus improving the engine. performance. In addition to plastic intake manifolds, the use of plastic front-end frames, plastic tailgates, etc. has become the norm.

How automotive plastic products are manufactured?
The three elements of automotive plastic product production are the injection molding machine used to produce auto plastic parts, the plastic resin used in car plastic components, and the most important plastic injection mold that forms the shape of vehicle plastic products.
After the plastic resin is plasticized in the heated barrel of the injection machine, it is injected into the cavity of the closed mold by a screw or plunger and is cooled to form automotive plastic products.
What are the commonly used plastics for automotive injection mold in China?
Commonly used plastics in automotive injection mold mainly include PA, PC, ABS, PP, POM, etc.

Nylon material (PA)
Nylon is mainly used for automotive engines and engine peripheral components, with main varieties including PA6, PA66, reinforced flame retardant PA6, etc.
Application on engine components: The engine hood, engine decorative cover, cylinder head cover and other components are generally produced with modified nylon. The preferred material for the intake manifold is fiberglass reinforced PA66. In addition to engine components, other load-bearing components of the car can also use reinforced nylon, such as oil filters, wipers, radiator grilles, etc.

Polycarbonate material (PC)
Due to its excellent heat resistance, impact resistance, rigidity and good processing fluidity, modified PC is mainly used in automotive for exterior and interior parts, components around dashboards, anti-freeze panels, door handles, and underflow. Auto parts such as plates, brackets, steering column sheaths, decorative panels, air conditioning system accessories, headlight parts, etc.

Acrylonitrile, Butadiene, Styrene (ABS)
Thermoplastic ABS resin is widely recognized as a freely designable engineering material with excellent aesthetics, flowability, toughness, dimensional stability and high heat resistance.
ABS has a wide range of applications in automotive interior and exterior components. ABS is mainly used in interior and exterior decorative parts that use spray painting, electroplating, water transfer printing, IMD and other processes, such as painted decorative strips, electroplated bright strips, electroplated grilles, electroplated signs, rearview mirror casings, etc. At the same time, because of its good dimensional stability, especially high temperature stability, it is also used in instrument cluster covers, steering column guards, middle panels of door guards, switch buttons, air outlet panels, etc.

Polypropylene (PP)
PP is the most widely used plastic resin for interior and exterior auto parts.
The main automotive plastic injection components used in PP materials are parts, such as instrument panel body, sub-dashboard body, glove box, storage box, door guard body, pillar guard body, door sill pressure plate, seat guard, and trunk guard. , passenger armrest, front/rear bumper skin, side skirt guards, front windshield lower decorative panel, fenders, etc.
Fiber-reinforced PP materials have high rigidity, especially long glass fiber reinforcement and glass fiber mat modification. They are often used in structural parts, mainly replacing metal, and are used in spare tire compartments, seat frames, and door modules. and other parts.

Polyoxymethylene (POM)
POM is mainly used in components with high creep resistance, fatigue resistance, wear resistance or self-lubricating requirements, such as bumper mounting brackets, opening handles, buckles, sealed internal mechanical components, speaker grilles, glass lifting systems, etc.

Introduction industry of automotive injection mold in China
As an important part of the automotive industry chain, automotive injection molds in China have a great impact on the development of China’s automobile industry, and the growing demand for cars has created a good business environment for the development of the automotive injection mold industry.
Most of China’s automotive injection mold factories are located in the Pearl River Delta and Yangtze River Delta regions. Current China injection mold output is 25.24 million sets, the huge production capacity has made competition extremely fierce. Many automotive mold factories in China have turned their attention to abroad injection molding factories. According to surveys, China’s mold export value has reached US$6.16 billion in 2022.

In China, the most famous automotive injection mold industry is in Dongguan City.
The numerical control rate of mold processing equipment and the performance of the equipment, mold processing technology, production specialization level and standard level are all in the leading position in China.

There are currently more than 10,000 upstream and downstream injection mold companies in Dongguan. Automotive injection mold manufacturers in Dongguan can purchase raw materials and mold accessories as quickly as possible. Moreover, due to the concentration of the industry, automotive mold professionals gather here, providing automotive mold technology and Quality is guaranteed.

Yuanfang mold is Automotive Injection Mold Experts, we have more than 20 years of experience in automotive plastic injection mold manufacturing, rich experience in multi-cavity automotive mold, two color automotive injection mold, auto insert mold, automobile over mold ect., based on customer automotive plastic part design, we are able to provide the best price mold making services solution with high-quality automotive plastic products.

Yuanfang mold is Automotive Injection Mold Experts, we have more than 20 years of experience in automotive plastic injection mold manufacturing, rich experience in multi-cavity automotive mold, two color automotive injection mold, auto insert mold, automobile over mold ect., based on customer automotive plastic part design, we are able to provide the best price mold making services solution with high-quality automotive plastic products.

Feel free to call or email us, Yuanfang Mold is happy to offer solution for your Automotive injection mold projects, send your inquiry to

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