Understanding the Importance of Injection Molding Pressure and Measuring Sensors


Injection molding is one of the most commonly used manufacturing processes across a wide range of industries. With that said problems with the process are frustratingly common. One variable that can impact the outcome of the process is injection molding pressure. Understanding the pressure application is crucial for optimal performance. 

In this blog, we’ll take a deep dive into the importance of injection molding pressure and how measuring sensors can make a significant impact on the manufacturing process. We will also explore different types of pressure used in injection molding and how to use them for the best possible results. So, let’s jump in.


Understanding Injection Molding Pressure:

Injection pressure is one of the most crucial elements during the plastic injection molding process. It plays a crucial role in the formation of the final product’s shape, size, strength, and consistency. Injection molding takes place using an injection unit and a clamping unit. The process can be divided into four stages: filling, pressure maintaining, cooling, and demoulding. Each of these stages requires careful attention to ensure that the final product is of high quality. In the injection process, six steps are involved: Clamping, Injection, Dwelling, Cooling Mold, Opening, and Ejection. 

The control of injection pressure is usually divided into one injection pressure, two injection pressure (holding pressure), or more than three injection pressure control. It is essential to monitor and maintain precise injection pressure during the entire process to ensure successful outcomes. The performance of injection molding pressure measurement sensors is equally imperative in producing high-quality components with tight tolerances, making it an essential aspect of the process.


What is Injection Molding Pressure?

Injection molding pressure is defined as the force that the screw applies to push the melted plastic material into the target mold cavity, which is counteracted by the clamping pressure of the machine. Different types of pressure are utilized in different stages of the injection molding process, including back pressure, injection pressure, and clamping pressure. 

A number of factors, including the size and shape of the part and the size of the gate opening, determine the injection pressure. Although lower back pressure is advantageous for pigment dispersion and plastic melting uniformity, high back pressure can present a number of challenges. Overall, understanding injection molding pressure is crucial for ensuring successful injection molding and quality products. Measuring sensors are often used to maintain the right pressure during the molding process.


The Power of Injection Pressure Molding:

Injection molding pressure is a crucial component of the injection molding process. It refers to the force applied by the reciprocating screw to push the molten plastic resin into a mold cavity. This pressure is balanced against the machine’s clamping pressure and is calculated based on the size and shape of the part and gate opening. 

The injection pressure molding process is used to fill molds with molten thermoplastics and create a desired shape. The power of injection pressure molding lies in its ability to create complex shapes and intricate geometries with great precision and consistency. In addition to injection pressure, there are other factors that affect the quality of the molded part, such as clamping pressure and back pressure. By measuring and regulating these pressures with sensors, manufacturers can ensure that their injection molding processes produce high-quality parts that meet their exact specifications.


Other Pressure types used in injection pressure molding:

Injection molding pressure is an important aspect of the injection molding process. It refers to the pressure required to inject the plastic material into the mold cavity. There are several types of pressures used in injection molding, including:

Clamping pressure, is used to counter injection pressure and is measured in the tonnage of the injection mold machine. Back pressure, which needs to be generated and surpassed before the screw returns. Lower back pressure is preferable.

Nozzle pressure refers to the pressure inside the nozzle that causes pressure on the plastic to flow. There is a direct relationship between nozzle pressure, linear pressure, and injection pressure.

Pressure loss can reach up to 50% in a piston injection molding machine. Excess tonnage can cause production problems in injection pressure molding. It is essential to understand the different pressure types used in injection molding and use measuring sensors to ensure that the pressure is correct for optimal production output.


Different Types of Pressure in Injection Molding:

In injection molding, there are various types of pressure that are crucial in creating quality molds. During the injection molding process, clamping pressure is applied to push the mold together, and the tonnage of the machine determines the clamping force rate. Back pressure is generated and surpassed before the screw returns, and the general rule is that the lower the back pressure, the better. 

The calculated injection pressure molding is necessary for producing quality molds. It is a balancing act between the machine’s clamping pressure, the size and shape of the part, and the size of the gate opening. By paying attention to these various pressures, manufacturers can achieve high-quality molds at a faster and more efficient rate. Measuring sensors play a vital role in monitoring the pressure levels during the molding process to ensure their accuracy and consistency.



In conclusion, Injection molding pressure is critical for producing high-quality injection-molded plastics. It is not only important to understand the basics of injection molding pressure but also the different types of pressure used in the injection molding process. It not only makes the process efficient but also improves the quality of the final product. 

With that being said, measuring sensors play a crucial role in maintaining the correct pressure during the injection molding process. The combination of pressure and sensing technology has made the process more reliable, consistent, and efficient. To learn more about injection molding pressure and the different types of measuring sensors, read our comprehensive blog and stay ahead of the curve.