What is Injection Molding and How Does it Work? - FOW Mould

What is Injection Molding and How Does it Work?

In business, one of the most important aspects to figure out is where your products will come from and how they’ll be produced. Different processes are preferred from one business to the next depending on what they want to achieve. One of the most used processes in the manufacture of different products for businesses is injection molding. This process exhibits amazing benefits that ensure you have quality products all through.

For this process, the best way to go about it is to consult an established injection mold manufacturer who will guide you through this process. The manufacturer will educate you on the materials you can use, create a working mold and prototype product design, then start mass-producing it for your business. This takes away so much pressure of having to deal with processes that you don’t fully understand. However, if you’d like to learn more about what this process entails, you are in the right place.

Table of Contents

What is Plastic Injection Molding

What is Injection Molding

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Plastic injection molding is a process used in the manufacturing industry to produce different plastic products that are applicable in various industries. This process comes in handy given that it is repetitive and very efficient. Given that the process uses molds that have been predesigned to create the desired shapes, you can be sure to achieve consistency. All the products made using this method will come out identical with exact measurements to ensure uniformity. Some of the aspects to consider in this process include:

Mold designers and mold makers

This process features the use of different professionals in the manufacturing industry. You’ll have designers who will help you come up with your product design by working with 3d graphics for better translations. 

There will also feature a mold designer and maker who will model the right mold design for your desired products. This will ensure that the results satisfy your needs accordingly. Lastly, engineers equipped to monitor the injection molding process will take over and start the manufacturing process.

Get a working prototype of your product

For this, you’ll however need to ensure that you get a working prototype first. This will help you make a better and more informed decision in whether that’s the product you are going for.

Defects that may present themselves

Once the product is ready you can then get to work with it. However, in this process, there may also be the possibility of having a few defects in the products you use. Some of the defects that could occur include flow lines, warping, flash, sink marks, ejector marks, and bubbles among others.

Dealing with defects during injection molding

With such defects, there are a few solutions to each that can be implemented to avoid having the same issues throughout the production cycle.

Working with a manufacturer who can provide professional plastic injection molding service is essential. They will offer great value by ensuring that all the products being manufactured are up to standard. Additionally, they will also ensure to use the right materials depending on the product and its applications.

How does Injection Molding Work

How does Injection Molding Work

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The injection molding process is a cycle that goes through different stages. These stages include:

Product Design Stage

Product Design Stage

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In this stage, you’ll be working closely with the designers of the company you choose to work with to create a visual representation of your products. This is important given that it will make way for the mold design to get into shape. For the product design, you’ll need to feature important aspects like the size, shape, and any aesthetic incorporations.

Doing this beforehand will help the manufacturer avoid making mistakes that may be costly to you. So ensure that you pay attention to the product design stages to get the best representation of your product. In this stage, your designer will use computer software to create the products in 3d to help you get a clearer picture of what you’ll be getting. You’ll be in a better position to determine whether the product designed is suitable for your business and start on other production stages.

Mold Design Stage

Mold Design Stage

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Now that you have your product design, the next stage that is so important is the mold design stage. Here, the mold to be used in the manufacturing process will be created to ensure the products turn out as expected. The mold is an essential aspect of the injection molding process given that it can make or break your productions. This is because when using the mold, the material that is injected into it will take its shape.

If the shape of the mold is not accurately designed, then you can be sure that your products will not turn out as you expect. This is why manufacturers work to ensure that in the mold design stage everything is taken into consideration. For instance, when it comes to the material to be used in the mold, you find that it needs to be strong and sturdy to withstand the high temperatures. Most molds feature the use of hardened steel or aluminum because they offer the perfect balance. Taking time in this stage is essential to avoid mistakes and defects during the manufacturing process and also ensure the products are top-notch.

Manufacturing Stage

Manufacturing Stage

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The manufacturing stage features different phases before the final product is realized. These phases include:


When it comes to the manufacture of plastic products using this method, there will feature the use of an injection molding machine. The first step when using this machine is clamping. This is the part where you ensure that everything is secure before beginning the manufacturing process. This machine comes with a mold divided into two halves. One half is stationary while the other can move in and out. The half of the mold that is flexible in movement is secured by a hydraulically powered clamping unit to keep it secure. 


Once the mold is secure, the injection of molten plastic material into the mold commences. The molten state is achieved when heat and pressure are applied during the injection process. The mold is designed to take in just enough molten material and release any excess back into the injection tool. 


Once the injection is complete, the molten material now has to sit in the mold for a while to facilitate its formation. This is where the mold-making process begins. During this time cooling occurs and the molten material solidifies forming the shape featured in the mold design.


Lastly, the mold opens and the final product is ejected. For this, a lot of pressure is required mainly because some mold formations tend to stick to the mold making ejection harder. 

Customize Injection Mold and Plastic Products

Injection Mold and Plastic Products

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When working on injection molds and plastic products that need customization, the best thing is to work with equipped designers. These designers will help you work on the different aesthetics and also help you create complex shapes that according to your products needs. Products such as auto molds and plastic box mould have different manufacturing standards. Plastic product customizations will feature the use of different surface finishes that are suitable for the injection process. 

Additionally, when looking into the surface finishes, you also need to remember the type of material in use. This will help ensure that the surface finish that is chosen fulfills the needs you have for your products. When working with the right injection mold manufacturer and designers, you won’t have to stress too much. They will be in a position to provide all the knowledge before the processes begin to give you a better understanding.


As you’ve seen, injection molding is a great option when it comes to the manufacture of plastic products in different industries. The process is designed to be accurate and offers the best results to all its users. For this, we’ve established that working with a qualified injection mold manufacturer is essential. It will allow you to enjoy the comfort that the products being manufactured will meet your needs. Be sure to choose a company that you resonate with and that will offer quality products and services.

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