Blog

Sequential Timer Controller in Hot Runner Systems: Working Principle, Benefits, and Applications

What is a Sequential Timer Controller?

A Sequential Timer Controller is a specialized control device designed for hot runner systems. Its main function is to precisely control the opening and closing of valve gates according to a predefined time sequence, ensuring optimized plastic flow during the injection molding process.

Why is Sequential Control Needed?

If all gates open simultaneously in a hot runner system, the following issues may occur:

Melt front collision → resulting in weld lines and visible flow marks;

Uneven cavity filling → leading to warpage and sink marks;

Excessive melt pressure → causing higher energy consumption and reduced mold life.

By opening the gates sequentially, the controller gradually fills the cavity, significantly improving part quality and consistency.

How Does the Sequential Timer Controller Work?

Operators set the opening and closing times for each gate on the controller.

The controller connects to the valve gate drive system (pneumatic, hydraulic, or electric);

During injection, the controller activates each gate according to the programmed sequence.

This enables precise multi-point sequential injection and optimized cavity filling.

Key Advantages

Improved Part Quality: Eliminates weld lines, voids, and other defects;

Higher Efficiency: Reduces scrap rate and rework;

Extended Mold Life: Minimizes pressure shocks during injection;

Easy Operation: Simple setup via touchscreen or remote interface;

Flexible Compatibility: Suitable for different hot runner systems and applications.

Application Fields

Sequential timer controllers are widely used in industries where high surface quality and dimensional accuracy are critical, including:

Automotive parts (dashboards, bumpers)

Household appliances

Medical devices

Consumer goods and packaging

conclusion

The sequential timer controller has become an essential tool in modern hot runner systems. By improving part quality, enhancing efficiency, and reducing production costs, it empowers manufacturers to achieve stable and optimized injection molding processes.

Why Choose CNTOP Sequential Timer Controllers?

At CNTOP, we specialize in providing high-performance hot runner control systems designed to meet the demanding needs of modern injection molding. Our Sequential Timer Controllers offer:

• Precision Control – Accurate timing for each valve gate, ensuring consistent part quality.

• User-Friendly Interface – Intuitive touchscreen operation for quick setup and monitoring.

• Flexible Compatibility – Works with pneumatic, hydraulic, or electric valve gate systems.

• Proven Reliability – Trusted by automotive, medical, and consumer goods manufacturers worldwide.

  
  

👉 Learn more about our solutions here: CNTOP Sequential Timer Controller