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Plastic Injection Mold

rjc is a world-class provider of advanced plastic injection mold. We offer a complete manufacturing solution that covers every aspect of raw material verification, tool making, part fabrication, finishing, and final inspection. Our international team of manufacturing experts is committed to providing you with the highest level of professional support for plastic injection mold of any size or complexity.

What is plastic injection mold?

Plastic injection molds are designed as hollow metal blocks with cavities used to shape molten plastic through the injection process. There are many holes inside the mold, and the temperature can be controlled by means of oil, water or heater.

Gates in the mold allow molten plastic to flow in, which then fills the cavity through runners and gates. After cooling, the mold is opened, and the ejector pin of the injection molding machine is pushed by the top plate to further eject the molded part.

  • Guide Pins– Installed to one half of the plastic injection mold and align the two halves by entering the holes in the other half. the most function is to locate the core and cavity insert in right position, avoid steps on parting line of molding parts or mismatch between two halves of molds.
  • Runner– Connect the sprue bush to molding cavities, it is a passageway of flow material, the section shape is usually round or trapezoid.
  • Gate–The narrowest position of the runner, where the flow material enters the molding cavity. There are many different types, some will be broken from molding part when ejecting out. such as submarine gate, tunnel gate. Some need to be cut after molding. like tab gate, side gate and so on.
  • Sprue (Bush) – Tapered hole in the center of the plastic injection mold into which the flow material travel from the nozzle of injection machine to runners
  • Locating Ring– Locating the plastic injection mold on the fixed platen of injection machines, so that the injection nozzle lines up with the sprue bush.
  • Mould Cavity(include cavity and core)– The space in the mold shaped to produce molding product.
  • The ejector (Pins)– Push the runner and molding parts out of the mold
  • The Shot– Total amount of material into cavities, include runner and molding parts
  • Ejector plate/Ejector backplate: Just for hold the ejectors in the right position
  • Clamping plate: Clamping the mold to the platen of injection machines

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Why we choose plastic injection mold(molding)?

As a highly accurate processing approach, the plastic injection molding process is able to be used to produce diversified plastic parts of almost any types. Though certain design restrictions do exist, the injection molds are made to ensure the great precision of the molded products. As a matter of fact, the precision of the finished products can be kept within 0.005in.tolerance.

Plastic injection molding is known as one of the most commonly used technologies for long production periods because it is very fast. But, how fast? Though its production speed may be dependent on the complexity of the mold structure, there is only about 15 to 30 seconds interval between cycle times.

The injection molding equipment requires minimal human supervision, of which the reason is that they usually work with a self-gating and full automatic tool, so as to realize streamlined operation and continuous production.

Nowadays, a lot of attention is paid to sustainability, so it is very common for product developers to opt for a process that would help with environmental protection and waste elimination. Not only is the plastic injection molding a highly efficient and effective process, it is also very resourceful. The reasons are i. only the needed amount of plastics is used to produce the desired product; ii) excessive materials will be recycled for further use.

In addition, the plastic injection mold making process is not only accurate, it also features great flexibility. It means that it is very easy for us to change the material type as well as the color for our production once we made a mold. also when you want to change the shape of the product, we just need to remove or add some steel to achieve it.

The density of the plastic material is much lower than metal, and plastic injection molding is one-time shaping process without second machining. so it is much cheaper than metal.

Why Choose RJC for Plastic Injection Mold

The finest production mold tools start with quality raw materials, strict process control, and expert toolmakers. Only a supplier with years of experience supporting Fortune 500 companies can ensure repeatable results for your production tooling needs. Here are some of the advantages that RJC offers for high-volume production tool making and injection molding services.

✓ A Complete Range of Services

We offer more than just tool making and molding services. Our complete package includes every manufacturing process you need for a total product development solution.

✓ Positive Material Identification

Your regulatory compliance and your peace of mind are assured with our industry-leading positive material identification department. People trust RJC when the job absolutely must be right.

✓ Proven Success

Thousands of companies of every size from around the globe have chosen to work with RJC to help them develop new injection mold tools and finished parts. Your success is the foundation of our reputation.

✓ Design Optimization

A comprehensive design for manufacturing review comes with every tool and product design project. You’ll receive superior results while saving time and money.

✓ Quick quotes for each item

We support your development goals by having no minimum order quantities or value for our injection molding production. Plus, we have a dedicated quote staff that provides fast, accurate and transparent pricing for every project, every time.

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RJC took the utmost care to create our tooling and consulted with us every step of the way.


We provide a wide range of services to help clients with all of the front-end work that goes into a product before actual production begins. Some of those services include preliminary design, material selection, pricing, mold design, evaluation and procurement, CAD/CAM, surface modeling, and communication with the customer’s engineering department. For each part, we manufacture we will do the DFM study and mold flow analysis which will improve and support the mold structure design.We bring you a combination of the best resources available; high technology equipment, quality workmanship, and program management and product development techniques that are flexible enough to meet the needs of your special requirements that can assist the molder or worker and save time and cost

Mold Flow

Quality products and services at the lowest cost and in the quickest time. A universal standard that every company must follow to compete in today’s markets. Every molded plastics part must run smoothly through product design, tool building, tryouts, manufacturing, assembly, field applications, and over the life of products. Our expertise in CAE (computer-aided engineering) in conjunction with the experience of hundreds of molded products provides a valuable link to reach the goal of producing quality products at the lowest cost and in the shortest time. Our engineers will analyze for mold filling, cooling, and warp (deformation) … for every part with the tooling design as well as scientifically validating key steps to make your product a success – designed and built right the very first time. Our unmatched expert approach to every project provides the best value in the long term and will save you cost and time.

Project Management

Project management is the key to the success and quality of the products ,A Project Engineer who has rich knowledge in tooling and plastic injection molding is appointed for each project. All of them have a good command of English.

The project engineers will be responsible to follow up tooling schedule and timely report to the customer on any issues and progress of the project he is handling. The project engineer also guarantees that customer’s technical requirement is followed.

Project Management Objectives

– On-Time Delivery– Assuring customer’s project is produced to customer’s standards and requests
– Anything communicated in a timely and clear way
– Complete project management and support from concept to final part inspection and approval.

Request Your Free Injection Mold Quote Today

Our  Most quotes are delivered within 24 hrs, or faster, depending on project details and your injection molding needs. Your customer support partner will contact you directly to ensure you’ve received and understand all aspects of your quotation and to answer any questions you may have about injection molding, the manufacturing process, the materials we use, your quote, and beyond!

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