The Development of Injection Blow Molding Machines in Energy Conservation

The Advantages of Modern Blow Molding Machines in Energy Saving

Modern injection blow molding machines have made tremendous progress in energy conservation. The energy-saving transformation of injection molding machines addresses the historically high energy consumption of traditional equipment. These upgrades mainly target core energy-consuming components such as hydraulic systems and heating devices.

Early fully hydraulic injection molding machines suffered from high energy consumption costs and poor workshop environments due to high-pressure throttling energy losses (up to 36%–68%) and inefficient resistance heating. Today, these challenges are being resolved through technologies such as electromagnetic induction heating, servo system optimization, and waste heat recovery, which significantly reduce overall energy consumption.

The Perfect Balance Between Energy-Saving and Quality Control of Modern Injection Blow Molding Machines

The perfect balance between energy-saving and quality control of modern injection molding machines relies on multiple technological improvements. Let’s break down the core aspects:

1. Energy Saving Renovation

Electromagnetic Heating Energy-Saving Devices
Electromagnetic heating uses the principle of electromagnetic induction to convert electrical energy into electromagnetic energy for heating. Typically, it rectifies 220V, 50/60Hz AC power into DC, then converts this DC into high-frequency high-voltage power at 20–40KHz.

Comparison with Traditional Heating Methods:

• Long Service Life
  The coil itself generates very little heat, so there is almost no wear, no maintenance, and no replacement costs. The heating cable withstands temperatures above 500°C and lasts up to 10 years.

• Safe and Reliable
  The cylinder's outer wall is heated through high-frequency electromagnetic action with almost zero loss. Surface temperatures of the coil stay close to room temperature, safe for human contact.

• Efficient and Energy-Saving
  Internal heating induces parts of the heating body directly to generate heat. Start-up is fast, preheating time is reduced by 60%, and thermal efficiency can exceed 90%. Compared to resistance heating, it saves 30–70% of electricity, greatly improving production efficiency.

• Accurate Temperature Control
  The coil does not generate heat itself, ensuring low inertia and consistent temperatures inside and outside the cylinder. Real-time, precise temperature control improves quality and efficiency.

• Good Insulation
  The electromagnetic coil uses specially wound high-temperature and high-voltage cable with strong insulation, no direct tank contact, and no short-circuit risk.

• Improved Working Environment
  By adopting internal heating, external heat radiation is minimal, and the equipment surface stays safe to touch. The ambient workshop temperature drops from over 100°C (resistance coil heating) to around room temperature, dramatically improving the production environment, reducing ventilation and cooling costs, and boosting workers' motivation in a safer, more comfortable workplace.

2. Servo Energy-Saving Renovation

The injection molding machine’s servo system uses dual closed loops for pressure and flow. The hydraulic system supplies oil only based on actual pressure and flow demands, overcoming high-energy consumption caused by high-pressure overflow in traditional quantitative pump systems.

During high-flow phases like pre-molding, mold closing, and injection, the motor operates at higher speeds. During low-flow phases like pressure holding and cooling, the motor slows down. Overall, the actual energy consumption of the oil pump motor can be reduced by 35%–75%.

3. Waste Heat Recovery

This technology recovers waste heat from high-temperature injection barrels and redirects it to drying drums, replacing their electric heating.

The waste heat recovery system consists of heat recovery elements, transfer components, and controllers, which allow the collected heat to be reused without affecting the machine’s normal operation. This approach is safe, reliable, and can entirely offset the electricity consumption of traditional drying systems.

Conclusion

Modern injection blow molding machines achieve a perfect balance between energy conservation and high-quality production. Through the integration of electromagnetic heating, servo energy-saving technology, and waste heat recovery systems, manufacturers can reduce energy costs, improve environmental conditions, and maintain strict product quality standards — a win-win for both production efficiency and sustainability.