Skip to content
Home » Blog » How are injection molds made

How are injection molds made

    Plastic injection mold drawing

    Injection molding is one of the most efficient and cost-effective methods for manufacturing plastic parts. It is used to create a variety of items from toys to automobile components. The process involves injecting heated plastic into a mold, which is then cooled and ejected from the machine. Injection molding is a complex process that requires careful planning and precision to ensure success.

    injection molds made process

    Mold Design

    The first step in the injection molding process is designing the mold. This is usually done with the help of a computer-aided design (CAD) program. The mold is created based on the desired shape of the product and is typically made of steel, aluminum, or plastic. Once the mold is completed, it is placed into an injection molding machine.

    Injection Molding Machine

    The injection molding machine is equipped with a hopper, which holds the plastic pellets or pellets of resin. These pellets are then fed into the machine and heated until they become molten. The molten plastic is then injected into the mold at a high pressure. As the plastic is injected, it fills the mold and cools to create the desired shape.

    Once the plastic has cooled, the mold is opened and the part is ejected. Depending on the complexity of the design, additional operations may be required, such as drilling, trimming, and assembly. The part is then inspected for quality and accuracy before being shipped to the customer.

    Benefits of Injection Molds

    Injection molding is an efficient and cost-effective method for producing plastic components. It is used for a variety of purposes, including making toys, automotive components, and medical devices. The process is generally fast and accurate, with little waste. The injection molding process can also be used to create complex parts, such as those with intricate details or multiple components.


    Injection molding is a great option for companies looking to produce parts in bulk quickly and accurately. However, it is important to be aware of the associated costs, such as the cost of the mold, the cost of the injection molding machine, and the cost of the materials. Additionally, it is important to ensure that the design of the mold is correctly created. A poorly designed mold can lead to parts that are not of the desired quality or that do not fit correctly.

    Injection molding is a great choice for companies that need to produce a high volume of parts quickly and accurately. It is a cost-effective way to create a variety of products, from toys to automotive components. With careful planning and precision, injection molding is a great way to create complex parts in a timely manner.