Injection Molding vs Extrusion Molding


As a business, one of the most important aspects to con […]

As a business, one of the most important aspects to consider is where you’ll be getting your products. This is especially true when it comes to different plastic products that you may require for your business operations. The production of these plastic products is usually outsourced to manufacturing companies to ensure that the products are of high quality. 

These manufacturing companies will use different processes depending on the specific needs you want. Some of the most relied-on processes include injection molding and extrusion molding. However, for most businesses, these terminologies may not mean much and it may be quite confusing to understand their differences.

This is why it is always best to work with a qualified molding manufacturer to ensure that you get the best services. With them, you’ll be in a better position to understand which production process works best for you. Getting to know the difference between injection molding and extrusion molding will help you better decide which process to work with.


What is injection molding?

What is Injection Molding

Injection molding was started in the 19th century and was used as a simple manufacturing process for buttons, combs, and other simple plastic products. However, since then, this manufacturing process has greatly evolved and is more efficient.

Additionally, it features the manufacture of more complex plastic products. The injection molding process features the use of an injection molding machine that comes with different crucial parts. These parts come in handy when it comes to the manufacturing process.

They include:

1. Injection unit

When it comes to the injection molding machine, the injection unit is a vital part that plays a crucial function. The injection unit is a syringe-like part that is used to introduce molten material into the mold cavity. Using this injection unit makes the process easier and allows for faster manufacturing processes.

2. Clamping unit

One of the best ways to ensure that your manufacturing process goes well is to ensure that the molds are secure. This is where the clamping unit comes in. It features a hydraulic lift that allows it to move in and out facilitating the opening and closing of the mold cavity.

3. Mold cavity

The mold cavity varies depending on the specific product to be manufactured. It is an essential part seeing as without it the manufacturing process would not result in quality products.


Injection molding process

With the different parts in the injection molding machine, you find that the process itself features a few cycles you should keep in mind.

They include:

1. Product design

The first place to start for any serious manufacturer is at the product design stage. This is where the groundwork is laid and foundations are set up. As the customer, you’ll need to work closely with your manufacturer and designers. This is the part you need to ensure that you are actively participating to ensure that your product design turns out as it should. With the right collaborations, you’ll easily achieve the right product designs.

2. Mold design

After the product design is complete, it is then up to the designer to work on the mold design. The design needs to depict the product design worked on earlier to ensure that the results are as required. Mold design is essential to avoid making irreversible mistakes.

3. Mold making

With the mold design, the mold-making process then commences giving the injection molding a structure and base. Without the mold, the process would not be of any use to businesses in need of plastic products. The mold-making process will feature the use of engineering expertise to ensure that the design is translated to its physical equivalent. This is an important step when it comes to this manufacturing process.

4. Injection molding

After the mold is done, it is then attached to the injection molding machine and secured firmly with the use of the clamping unit. The injection molding unit then introduces molten material into the mold. To make this process easier the injection unit is designed to dispense just the right amount of molten material. It does this by dwelling on the mold to absorb any excess molten material. Once the molten material is in the mold, it is allowed to cool taking the form of the mold that is being used. Once the product is formed, the clamping unit releases and the mold opens releasing and ejecting the end product.


What is extrusion molding?

The extrusion molding process is mainly used when it comes to the manufacture of 2d shapes. It is a great plastic manufacturing process to consider. It features the use of a 2d die where the molten plastic material is passed through. In the die, the molten plastic material is allowed to cool forming a solid shape. The shape formed by the cooled plastic material is dependent on the shape of the 2d die being used.

As with the other molding machines, the temperature to be used here will be normal. The heater keeps heating the plastic until the plastic extruder successfully inserts the wire into it. Colorants and UV inhibitors, in liquid or pellet form, are commonly used and can be inserted into the resin until it enters the hopper. The material comes into contact with the screw on reaching the feed throat near the rear of the barrel. The plastic resin is forced forward into the barrel by the spinning screw, which is heated to the ideal melt temperature for the resin.

What is Extrusion Molding


The difference between injection molding and extrusion molding

When it comes to the differences between the injection molding process and the extrusion molding process, there is not a lot to consider.

They include:

1. Injection molding features the need for an intricate product design while the extrusion molding process does not feature such designs

2. The extrusion molding process is used for 2-dimensional shapes while injection molding is more complex catering to the 3-dimensional shapes.


Whatever kind of mould do you want to make, SWY MOULD can provide you good service with good quality mould, welcome to contact us.


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