Servo PET Preform Injection Molding Machine

Efficient, Energy-Saving, and Stable Production Solution

What is a Servo PET Preform Injection Molding Machine

A servo PET preform injection molding machine is an advanced system that uses a servo motor-driven hydraulic system to control the molding process. Unlike traditional machines that run continuously, the servo system adjusts power output in real time based on actual demand.

• Traditional machines: Constant motor operation, high energy consumption
• Servo machines: Power on demand, significantly reduced energy usage

This technology is widely used in the production of:

• Mineral water bottles
• Beverage bottles
• Edible oil containers
• Daily chemical packaging

Machine Structure and Main Components

A servo PET preform injection molding machine mainly consists of the following systems:

1. Injection Unit

Responsible for plasticizing and injecting PET material.
High-performance screw design ensures uniform melting and stable injection.

2. Clamping Unit

Provides stable clamping force to ensure mold integrity, especially for high-cavity molds (48, 72, 96 cavities).

3. Servo Drive System (Core Component)

Includes servo motor, driver, and pressure/flow control system.
Enables precise control of:

Pressure

Flow rate

Speed

4. Hydraulic System

Works together with the servo system to execute all machine movements such as injection, clamping, and ejection.

5. Control System

Typically PLC or industrial computer-based:

Process parameter control

Real-time monitoring

Alarm and diagnostics

6. Robot System (Optional / Standard)

Side-entry robot or 3-position robot system for automatic preform removal, improving efficiency and reducing labor.

Key Advantages of Servo PET Preform Injection Machines

1. Significant Energy Savings (30%–70%)

The servo system only consumes energy when needed.
During cooling or idle phases, energy consumption is minimal.

 This leads to substantial electricity cost savings and faster ROI.

2. High Precision and Product Consistency

Servo control ensures:

Accurate pressure control

Stable injection speed

High repeatability

Results:
✔ Consistent preform weight
✔ Uniform wall thickness
✔ Lower defect rate

3. Faster Response and Shorter Cycle Time

Servo motors respond faster than traditional motors:

Faster injection

Efficient mold opening/closing

Shorter cycle time (e.g., 12–15 seconds per cycle)

 Higher production capacity

4. Low Noise Operation

Servo systems operate quietly, especially under low load conditions:

✔ Improved working environment
✔ Reduced noise pollution

5. Lower Oil Temperature and Higher Stability

Demand-based energy supply reduces hydraulic oil temperature:

Less cooling required

Longer oil lifespan

More stable machine performance

6. Lower Maintenance Cost

Reduced unnecessary operation leads to:

Less mechanical wear

Lower failure rate

Longer machine service life

Typical Applications

Servo PET preform injection molding machines are widely used for:

Mineral water preforms (e.g., 1881 neck)

Carbonated beverage bottles

Edible oil containers (e.g., 3025 neck)

Cosmetic and daily chemical packaging

Pharmaceutical containers

They are especially suitable for:
 High-cavity molds (48 / 72 / 96 cavities)
 Mass production lines

Future Development Trends

The servo injection molding technology continues to evolve toward:

Faster and more responsive servo systems

Smart manufacturing (MES integration)

Fully automated production lines

Integration with blow molding systems

 The industry is moving toward high efficiency, intelligence, and green manufacturing

Conclusion

Servo PET preform injection molding machines have become the preferred solution in the industry due to their:

Energy efficiency

High precision

Stable performance

Increased productivity

For manufacturers, investing in a high-performance servo preform injection machine is not only a technical upgrade but also a strategic move to enhance competitiveness and sustainability.