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Plastic Auto Parts Injection Molding


Mold Making & Plastic Injection One-stop Service

Yuyao Hualong Moulds & Plastic Products Co.,Ltd.

Yuyao Hualong Moulds & Plastic Products Co.,Ltd. was established in 1988. At present, there are 15 plastic injection molding machines from 100g to 3500 g, more than 20 mold manufacturing equipment such as machining centers, and more than 20 testing equipment and other auxiliary equipment. As leading Plastic Injection Molded Auto Parts manufacturers and Auto Parts factory in China, We have 100 employees and more than 30 managers and professional technicians.

After over 30 years of indomitable efforts, with the molds-making and plastic products-processing as the mainstay, our company has implemented a service for product development, mold-designing and making, plastic injection-molding and finished product-assembly in a coordinated process. Hualong mold has long history of serving European and American high-quality brands and well-known public companies at domestic and abroad. We custom make injection molded Plastic Auto Parts. Customized products involve all kinds of instruments, equipment accessories, industrial automation and intelligent equipment of the Internet of things, auto accessories, kitchen appliances, household products, etc. Products are widely used in power, communications, security, automotive, aerospace, medical, life and other different fields.

We have gained certifications of ISO9001, ISO16949 quality management system and ISO14001 environmental management system. OEM/ODM plastic injection molded Auto Parts. We accept annual factory inspection of clients, and conduct ECOVADIS audits on environment, labor and human rights, business ethics and sustainable procurement.

Customized Service Custom Advantage

Custom Process

  • Drawings or Samples

    We get the drawings or samples from customers.

  • Drawings Confirmation

    We will draw the 3D drawings according to the customers' 2D drawings or samples,and send the 3D drawings to customers for confirmation.

  • Quotation

    We will quote after getting the customers' confirmation,or quote directly according to customers' 3D drawings.

  • Making Molds/Patterns

    We will make molds or pattens after getting the mold orders from the customers.

  • Making Samples

    We will make real samples using the molds and send to customers for confirmation.

  • Mass Producing

    We will produce the products after getting the customers' confirmation and orders.

  • Inspection

    We will inspect the products by our inspectors or ask the customers to inspect together with us when finished.

  • Shipment

    We will ship the goods to the customers after getting the inspection result ok and the customers' confirmation.

Every certificate witnesses our profession


  • ISO45001
  • ISO14001 Environmental Management System Certification
  • IATF16949 Automotive Industry Quality Certification
  • ISO9001 Quality Management System Certification
  • Sustainability Rating
  • POM F20-02 ROHS SGS Report

Develop customized mold products according to customer requirements

Comprehensive analysis of projects, high degree of cooperation with customers, strong timeliness, good follow-up service and stable production.

Learn about customization
Industry Knowledge

What are the most important trends in plastic auto parts injection molding technology

Injection molding is a widely used manufacturing process for producing plastic parts, and it has been widely used in the automotive industry to produce high-quality, low-cost, and durable plastic auto parts. With the advancement of technology and increasing demand for efficiency, manufacturers are adopting new and innovative techniques in plastic auto parts injection molding.

One of the most significant trends in plastic auto parts injection molding is the use of high-performance materials. Manufacturers are increasingly using high-performance polymers that offer excellent mechanical properties, such as strength, stiffness, and heat resistance. These materials are becoming more popular in the automotive industry because they provide lightweight, durable, and cost-effective solutions. Examples of such materials include reinforced plastics, thermoplastic elastomers, and thermoplastic composites.

Another trend in plastic auto parts injection molding technology is the use of automation and robotics. Automation has been widely adopted in the automotive industry to improve efficiency, reduce production costs, and increase the quality of products. Robotics technology has become more sophisticated, allowing for more precise and repeatable processes. For example, robots can be used to perform tasks such as material handling, part assembly, and quality inspection, which significantly improves production efficiency and accuracy.

In addition, manufacturers are using simulation software to optimize the injection molding process. Simulation software allows manufacturers to create a virtual model of the mold and simulate the injection molding process to identify potential issues and optimize the process parameters. This technology enables manufacturers to identify potential design flaws before the mold is manufactured, reducing the risk of errors and improving the quality of the final product.

Another important trend in plastic auto parts injection molding technology is the use of advanced mold technologies. Advanced mold technologies include the use of conformal cooling, hot runners, and multi-cavity molds. Conformal cooling allows for more efficient cooling of the plastic part, resulting in faster cycle times and improved part quality. Hot runners enable the injection of molten plastic directly into the mold cavity, which reduces waste and improves the accuracy of the process. Multi-cavity molds allow for the production of multiple parts in a single cycle, which significantly reduces production time and costs.

What are the most important considerations when designing molds for plastic auto parts injection molding

Plastic injection molding is one of the most widely used manufacturing processes in the automotive industry. It allows for the efficient production of high-quality plastic parts with complex geometries at a low cost.

The first and most important consideration when designing molds for plastic auto parts injection molding is the material selection. The mold material must be able to withstand the high pressure and temperature of the injection molding process without degrading or deforming. Typically, molds are made of steel, with a variety of grades and finishes available depending on the specific requirements of the part being produced.

Another important consideration is the part design itself. The mold must be designed to accommodate the geometry of the part, including any undercuts, internal features, and surface finishes. This requires careful planning and a deep understanding of the injection molding process, as well as the properties of the plastic material being used.

In addition to the part geometry, the mold must also be designed to allow for proper cooling and ejection of the part. Cooling channels are typically incorporated into the mold to ensure even cooling of the plastic, which can help to prevent warping, shrinkage, or other defects. Ejection pins or other mechanisms are also included to remove the part from the mold once it has solidified.

The gate location is another critical consideration in mold design. The gate is the point at which the plastic enters the mold cavity, and its location can have a significant impact on the part quality. A poorly placed gate can result in flow lines, sink marks, or other defects in the finished part. Therefore, the gate location should be carefully chosen to ensure optimal filling of the mold cavity and minimal stress on the part.

Another important consideration is the number of cavities in the mold. This will depend on the expected production volume and the size and complexity of the part. Multiple cavities can increase productivity and reduce costs, but may also require more complex mold design and longer cycle times.

How can plastic auto parts injection molding be used to create parts that meet strict regulatory and safety requirements

One of the primary reasons why plastic auto parts injection molding is used to create parts that meet regulatory and safety requirements is its ability to produce parts with high precision and accuracy. The process allows for the creation of parts with consistent dimensions, which is essential when producing parts that must fit together precisely, such as those found in the automotive industry. Additionally, the process can be controlled to create parts with specific mechanical properties, such as strength and durability, which are critical when designing parts that must withstand harsh operating conditions.

Another advantage of plastic auto parts injection molding is its ability to create parts with complex geometries. The process allows for the creation of parts with intricate shapes and features that would be impossible to produce using traditional manufacturing techniques. This is particularly important when designing parts that must meet strict regulatory and safety requirements, as these parts often have unique shapes and features that are required for proper function and safety.

When producing parts that must meet regulatory and safety requirements, it is essential to use materials that are compliant with applicable regulations and standards. Many plastic resins used in injection molding are engineered to meet specific regulatory and safety requirements, such as those related to fire resistance, chemical resistance, and electrical conductivity. Additionally, many resins used in injection molding are recyclable and can be reused in the production of new parts, making them a more sustainable choice.

The injection molding process also allows for the creation of parts with specific surface finishes, which is essential when producing parts that must meet regulatory and safety requirements. For example, parts used in automotive interiors must have a specific surface finish to meet aesthetic and safety requirements. The injection molding process can be controlled to create parts with a range of surface finishes, from smooth and glossy to textured and matte.

  • Where are your products mainly exported to?
    Our products are mainly exported to the United States, Canada, the Netherlands, France, Italy, the United Kingdom, South Korea, and other dozens of countries.
  • How to deliver the goods to us?
    Foreign customers usually ship by sea. We are only 80 kilometers away from Ningbo Port, so it is very convenient to export by sea. Of course, if the customer's goods are urgent, we can also ship by air. Ningbo Airport and Shanghai International Airport are very close to us.
    Domestic customers, we have our own van and driver to arrange delivery.
  • How many employees of your comany? What about the technicists?
    The company has more than 100 employees, including more than 30 managers and professional and technical personnel.
  • How about the capacity of your company?
    The company covers an area of 9,000 square meters, with a modern workshop of more than 8,000 square meters. We currently have thirteen plastic injection molding machines ranging from 100 grams to 3500 grams, and more than ten mold manufacturing equipment such as machining centers, with an annual production capacity of 80 million yuan.
  • Do you have some standard parts?
    No, we are a pure custom manufacturer.
  • Can you do customized products?
    Yes, we mainly do customized products,we are mainly doing customized products according to the customers’ drawings or samples.
  • What applications do your products relate to?
    Our products cover almost every aspect of your life. Products have been involved in instrumentation, auto parts, medical equipment, smart equipment, audio-visual office supplies, fitness equipment, small kitchen appliances and many other industries.
  • What products can you offer?
    We mainly accept the customization of injection molds and the production of corresponding products.
  • Are you a direct manufacturer or a trading company?
    We are a professional manufacturer of customized injection molds and injection products. We also accept orders from domestic and foreign customers and have the right to export independently.
  • How to guarantee the quality of your goods?

    Firstly,we will do the inspection after every process.for the finished products,we will do 100% inspection according to the customers’ requirements and the international standard.

    Then, we have the more advanced and complete testing equipment in the industry: color detectors, three-coordinate measuring instruments, 3d scanners, etc. To ensure that the customer's all-round testing requirements for product color, high-precision geometric size testing, etc. are met.

    In addition, we have a professional team to do a complete technical analysis in advance. According to the needs of different materials, shapes and performances of the products, we will make corresponding molds or increase the necessary technological processes such as cooling and boiling to ensure that the product performance and shape meet the requirements of customers and reduce follow-up troubles.

  • What’s the payment term?
    When we quote for you,we will confirm with you the way of transaction,fob,cif,cnf,etc.
    For mass production goods, you need to pay 30% deposit before producing and70% balance against copy of documents. the more common way is by t/t. l/c is also acceptable.
  • How long can I get the feedbacks after we sent the inquiry? 
    We will reply you within 12 hours in working day.