Giant Injection Molding Machine Hydraulic Vs. Electric Options

Giant injection molding machine are capable of producing a variety of different plastic products, and as technology improves and iterates, two different types have emerged. This article introduces you to the two main options for giant injection molding machines: hydraulic and electric systems. Understanding the differences between these options allows manufacturers to make decisions that suit their needs, meet their production needs, and optimize their operations.

Giant Injection Molding Machine: Hydraulic System

First, giant injection molding machines with hydraulic systems can handle high pressures and large volumes of hydraulic oil. The large size of hydraulic pumps, valves, and cylinders allows them to withstand the enormous forces required to inject and clamp large molds. Secondly, they also use proportional and servo valves, often used to adjust flow and pressure with high precision to control the injection and mold clamping process accurately. Usually, multiple hydraulic circuits are included to independently control different functions such as injection, clamping, ejection, and core movement. This modular design enhances flexibility and provides optimized performance for various molding applications.

Giant Injection Molding Machine: Electrical System

First, electric systems in giant injection molding machines enable precise control of every axis of motion, including injection, clamping, and ejection functions. This improves part quality and consistency and is ideal for high-precision molding applications. Secondly, electric motors are more energy efficient than hydraulic presses. Using electric servo motors only when necessary and combined with a regenerative braking system can significantly reduce energy consumption and operating costs, making it an environmentally friendly and cost-effective solution. Electric injection molding machines have faster response and cycle times than hydraulic machines. The direct drive technology of electric servo motors enables rapid acceleration and deceleration, resulting in shorter cycle times and increased productivity.

Compare performance and efficiency

Hydraulic system:
Hydraulic systems have been the traditional choice for giant injection molding machines, providing ruggedness and reliability when handling high pressures and large volumes of hydraulic oil.

In terms of performance, the hydraulic system provides enough force for clamping and injection of large molds, making it suitable for heavy-duty applications. However, due to the inherent characteristics of hydraulic fluids and mechanical components, they may exhibit slower response times and cycle speeds than electrical systems.

In terms of efficiency, although hydraulic systems have improved with the introduction of energy-saving features and variable frequency drives, they generally exhibit lower energy efficiency compared to electric systems. Due to hydraulic oil’s constant pumping and heating, hydraulic systems consume more energy, resulting in higher operating costs over time. Hydraulic systems require regular maintenance to ensure optimal performance and prevent problems such as leakage, contamination, and component wear.

Electric system:
On the performance side, electric systems precisely control injection, clamping, and other machine functions, resulting in greater accuracy, repeatability, and part quality. The direct drive technology of electric servo motors enables faster response times and cycle speeds.

In terms of efficiency, due to the use of servo motors and regenerative braking technology, electric systems are more energy-saving than hydraulic systems. This makes the power system a greener, more cost-effective option in the long run. Electric systems generally require less maintenance than hydraulic systems because they have fewer mechanical parts and do not rely on hydraulic oil.

Application-specific considerations

For hydraulic systems they excel in applications requiring high clamping force or injection pressure, such as molding large automotive parts or industrial components. Operators can ensure that the hydraulic system is adequately sized and configured to deliver the required force and pressure consistently. It is important to note that hydraulic systems are susceptible to temperature fluctuations, affecting the hydraulic oil’s viscosity and machine performance. Effective temperature control measures are critical to maintaining hydraulic fluid within optimal operating ranges.

Electrical systems are ideal for applications that require high precision, accuracy, and repeatability, such as molding complex electronic components or medical devices. In this application, the operator should optimize machine parameters such as injection speed, pressure, and position control to consistently achieve the desired part quality. Electrical systems offer significant energy savings compared to hydraulic systems, making them ideal for applications where energy consumption is a primary concern.

Cost considerations and return on investment

The investment cost is essential when purchasing a giant injection molding machine because it will affect the overall ROI. Hydraulic systems typically have lower upfront costs but may incur higher operating expenses over time due to energy consumption and maintenance requirements. In contrast, electric power systems may have a higher initial investment but provide long-term cost savings through energy efficiency and reduced maintenance requirements. When choosing between hydraulic and electric options, manufacturers should carefully evaluate the total cost of ownership and return on investment potential.


The selection of hydraulic and electric systems for giant injection molding machines requires careful consideration of performance, efficiency, and cost. By weighing these factors in conjunction with their production needs and operational priorities, manufacturers can make informed decisions to optimize their molding processes.

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