In high-speed PET bottle production, energy consumption is one of the highest operational costs. Specifically, the generation of high-pressure compressed air required for bottle blowing demands massive amounts of electricity. For many factories, once the blowing cycle is complete, this expensive high-pressure air is simply vented into the atmosphere. This is not just exhausting air—it is exhausting your profit margins.

As a leading system solution provider, BANGE Machine focuses on eliminating this waste through advanced engineering, helping factories transform their heavy energy expenses into sustainable bottom-line savings.

The Hidden Cost of High-Pressure Air in PET Blowing

During the PET blow molding process, compressed air is typically divided into two lines:

• Low-Pressure Air (typically 8–10 bar): Used for pneumatic actions, cylinder movements, and control systems.
• High-Pressure Air (typically 25–40 bar): Used for the actual stretching and blowing of the PET preforms into the final mold shapes.

In conventional machinery, after the high-pressure blowing stage concludes, the compressed air inside the bottle is directly discharged. Generating 40-bar compressed air continuously requires high-power, multi-stage compressors that consume a staggering amount of electricity. Without a recovery mechanism, up to 50% of this energy is completely wasted.

The BANGE Solution: Advanced Energy-Saving Air Circuit Recovery

To solve this industry-wide pain point, BANGE Machine integrates a highly efficient energy-saving air circuit recovery system into our full servo high-speed blow molding machines.

How the Recovery System Works

Instead of directly venting the high-pressure air after the bottle is formed, our specialized recovery valve block intelligently diverts the exhaust air based on pressure gradients:

1. Primary Recovery (High-to-Low): The residual high-pressure air (still at ~15–20 bar) is recycled back into the machine's low-pressure system to power the pneumatic cylinders and mechanical operations. This eliminates the need for the low-pressure compressor to work continuously.
2. Secondary Recovery (Pre-Blowing Assist): The remaining pressure can also be routed back to assist in the initial pre-blowing stage of the next cycle, drastically reducing the load on the high-pressure compressor.
3. Final Exhaust:** Only the minimal remaining low-pressure air is quietly exhausted, ensuring quiet operation and a much safer, more comfortable factory floor environment.