Electric Injection Molding Machines: WALMO, at the Pinnacle of the Injection Molding World, Impresses Its Customers with Energy Efficiency and Precision!
WALMO Injection and Molding Machine Division
The advancement in plastic injection molding technologies is redefining efficiency and quality standards in industrial production. Representing the most advanced point of this evolution, fully electric injection molding machines exhibit steady sales growth in the global market thanks to the cost advantages and high product quality they offer.
Particularly in line with rising energy costs and tightening environmental standards, the WALMO Injection and Molding Machine Division leads the industry with its fully electric solutions featuring high cleanliness levels, 50% to 75% energy savings, excellent repeatability, and high injection speeds. Let’s take a closer look at the technological privileges offered by WALMO electric injection molding machines, which aim to increase product quality through continuous R&D investments and reduce the total cost of ownership for businesses.
1. What is an Electric Injection Molding Machine?
While traditional plastic processing operations started with hydraulic systems, they have evolved over time into hybrid systems and, today, to the most advanced stage: fully electric injection molding machines.
In traditional hydraulic machines, the system keeps the hydraulic pump running continuously even in standby mode, causing uninterrupted energy consumption. In electric injection molding machines, power is consumed only when a movement takes place, and the motor output is instantaneously adjusted to specific current requirements.
The basic operating principles and advantages of electric systems are as follows:
- Digital and Independent Servo Control: The entire process is digitally managed by high-efficiency servo motors. Each individual axis—such as injection, extrusion (material feeding/plasticization), mold clamping, and part ejection (ejector)—is driven by its own independent motor.
- High Energy Efficiency: By eliminating hydraulic power losses and continuously running pumps, 50% to 75% energy savings are achieved compared to traditional hydraulic machines.
- Clean Production: Since no hydraulic fluid is used, burdens such as oil leaks, oil changes, and disposal are eliminated, providing a clean and safe production floor.
- Comparison of Electric and Hydraulic Injection Molding Machines
The fundamental difference that sets electric injection molding machines apart from traditional and hybrid systems is that their mechanical drive system and control infrastructure rely entirely on electric servo motors and precision mechanical transmission components.
The following table clearly outlines the technical and operational differences between these technologies:
| Technical Parameter |
Hydraulic (Induction) |
Hydraulic (Servo) |
Hybrid |
Fully Electric (WALMO) |
| Drive Source |
Induction Motor + Hydraulic Pump |
Servo Motor + Hydraulic Pump |
Servo Motor + Hydraulic Pump (Feeding servo) |
Servo Motors |
| Drive Method |
Central Supply (Oil) |
Central Supply (Oil) |
Central Supply + Separate Feeding |
Independent Axis Movement |
| Power Transmission |
Hydraulic Oil |
Hydraulic Oil |
Hydraulic Oil / Electricity |
Timing Belt + Pulley |
| Drive Element |
Hydraulic Cylinder + Valve |
Hydraulic Cylinder + Valve |
Cylinder + Electric Motor |
Ball Screw (Lead Screw) |
| Pressure Sensor |
Hydraulic Pressure Sensor |
Hydraulic Pressure Sensor |
Hydraulic Pressure Sensor |
Load Cell |
| Injection Speed |
100 – 150 mm/s |
100 – 150 mm/s |
150 – 200 mm/s |
~250 mm/s (Up to 1000 mm/s in special series) |
| Position Precision |
±0.5 mm |
±0.5 mm |
±0.1 mm |
±0.01 mm |
| Simultaneous Movement |
Not Suitable |
Not Suitable |
Only During Material Feeding |
Standard (Simultaneous Compound Movements) |
| Noise Level |
~90 dB |
~85 dB |
~80 dB |
≤70 dB |
| Application Area |
General Purpose Production |
General Purpose Production |
General and Partially Precise |
General Purpose, High Precision, High Speed |
3. Application Areas of Electric Injection Molding Machines
In the past, the motor torque capacities of electric machines were limited to narrow product groups; however, thanks to advancing servo motor technologies and increasing production volumes, motor torque powers have increased significantly. The growth in the scale of part supply has also brought the investment costs of electric injection molding machines down to more accessible levels.
Today, WALMO electric injection molding machines have become standard in many critical sectors requiring high tonnage and precision:
- Medical Devices and Supplies: Hygienic production in clean room environments where oil contamination is strictly unacceptable.
- Automotive Industry: Production of technical parts requiring tight tolerances and high mechanical strength.
- Precision Optics and Lens Molding: Scratch-free, stain-free part production with high optical clarity thanks to micron-level ( ) position control.
- Electronics and Home Appliances: Durable housings and internal components with thin walls and complex geometries.
- Fast-Moving Consumer Goods and Packaging: High-volume production with low cycle times and simultaneous movement capability.
4. Market Outlook and Industry Future
In the future injection molding market, energy saving and process precision will be the two main strategic parameters shaping businesses’ machinery investments. The two most critical challenges that the modern manufacturing sector must solve are increasing product quality and lowering unit production costs.
With the tightening of global environmental regulations (carbon footprint limitations, energy efficiency directives, etc.), traditional hydraulic machines—which consume high amounts of energy and generate oil waste—are being rapidly replaced by electric platforms.
With its innovative engineering solutions, low operating expenses, and high sustainability vision, the WALMO Injection and Molding Machine Division continues to offer industrialists the production standards of the future today.