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How Plastic Injection Molding Works

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The application of plastic injection molding is commonly utilized in plastic parts production. This includes toys, medical equipment, and more.

In the automotive and aerospace industry, a lot of the components are made using plastic injection molding. 

With its high-quality and reliable performance, injection molding is one of the most common processes utilized to create plastic parts. 

However, how does plastic injection molding work? Well, here are a couple of things you should know.

What is Injection Molding?

First of all, what is injection molding? For those who don’t know, injection molding is a complicated process of manufacturing parts. 

Using a unique electric or hydraulic machine, the process melts, injects, and sets plastic into the shape of a metal mold that is inserted into the machine. 

There are a couple of reasons why plastic injection molding is the most commonly utilized process in various industries. These include:

  • Quality

Whether manufacturers are searching for highly detailed, tensile, or strong parts, the injection molding process can produce them at a high quality repeatedly. 

  • Cost-Effectiveness

After creating the mold, the cost of production per part is quite cheap. This is especially true if they’re produced in high numbers. 

  • Consistency

The injection molding process can create hundreds of thousands of parts quickly with the same quality. This only happens if the process parameters are strictly controlled.

  • Efficiency

Injection molding machines can create hundreds of items every hour after the process has been tested and set up. Using electric injection molding machines also makes the process eco-friendly.

  • Flexibility

A medical plastic injection molding company can choose the mold type and design of thermoplastic that is utilized for every part. Because of this, the molding process can create a range of parts. This includes components that are highly detailed and complicated.

The component quality, efficiency, and cost-effectiveness are simply some of the reasons why a lot of companies choose to utilize injection molded components for their products.

How Does Plastic Injection Molding Work?

While the injection molding process is complex, you can break it down into a couple of crucial steps that help you understand how it works and why it is very effective. 

For those who don’t know, there are three main parts of the injection molding machine. These parts are the heated barrel, the screw, and the feed hopper. 

The machine works by taking plastic granules or powder and manipulating it to shape them into a component, depending on the dimensions and requirements. 

Whenever the feed hopper obtains the plastic powder, it then utilizes the frictional action of the screw to produce heat. 

After the plastic reaches the right temperature, the machine will inject it into the mold cavity. This is where it will gradually cool and take the shape depending on the design of the mold. 

If needed, manufacturers can use the advanced injection molding methods to produce components out of several materials. 

Also, it is possible to utilize insert molding to add plastic components over existing components made out of other materials. 

The fundamental idea behind the injection molding process might appear simple. However, the truth is that it’s an extremely complex process that needs the correct expertise and equipment. 

However, when it’s done properly, injection molding can produce great results consistently. That is why a lot of manufacturers, such as plastic chair manufacturing companies, use this method.

Applications of Injection Molding

The two most crucial considerations that most companies look for when producing PTFE machined parts are cost-effectiveness and precision.

Because of this, it isn’t a surprise that a process such as injection molding has become so well-known and has been utilized for smaller and bigger runs.

  • Medicine

Because of this process, medical companies can produce important parts and tools cheaper. This helps make healthcare more accessible to all individuals around the world.

A lot of crucial medical tools and instruments all rely on the precision of injection molding. 

  • Construction Parts

The construction and building industries are other industries that utilize the plastic injection molding process. 

In these industries, complex and custom-made components play a crucial role in the process of building structures and homes. 

These parts also have to meet strict requirements when it comes to fit and quality. Nowadays, injection molding is even utilized to create parts that can replace metal parts. This offers great performance for a much cheaper price. 

  • Food and Beverage

As mentioned above, injection molding provides manufacturers the ability to create components from a huge variety of materials.

This is extremely vital in an industry, such as food and beverage. The reason for this is that it needs to comply with the huge variety of rules regarding the safety of food containers. 

With injection molding, manufacturers can utilize non-toxic and BPA-free plastics that aren’t only safe to come in contact with food but can also endure temperature fluctuations


Plastic injection molding is perhaps one of the best processes when it comes to producing parts and products. If you’re looking for an affordable method of creating plastic components, you should consider this process. 

When looking for a plastic injection molding company, always do your research first. Ensure that the company is experienced and reliable.

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