Precision PET Blow Molding Machine | High-Cavity, High-Speed Production

As a leading manufacturer in the industry, we specialize in engineering high-precision, high-output blow molding solutions. Our 6-cavity PET fully automatic blow molding machine represents the perfect balance of production efficiency, energy consumption, and investment cost for medium-scale beverage and liquid packaging producers.

Core Concept and Design

A 6-cavity blow molding machine is designed to produce six PET bottles simultaneously in a single cycle. It transforms pre-made PET preforms into finished, ready-to-fill bottles through a process called stretch blow molding (SBM). The "fully automatic" designation means the entire process—from preform feeding to bottle ejection—is seamless, computer-controlled, and requires minimal human intervention.

Key Components and Their Functions

1. Preform Hopper & Elevator: Preforms are bulk-loaded into a hopper and gently elevated to the correct height for feeding into the sorting mechanism.

2. Preform Orienter & Feeding System: A rotary orienter correctly aligns the preforms' necks and feeds them into a starwheel system that precisely places them onto the blow molding station's neck handling units.

3. Infrared Oven (Heating System): A critical stage where preforms rotate on a carousel through a series of independently controlled infrared heaters. This evenly heats the preforms to a specific temperature profile, making the PET material malleable for blowing.

4. Blow Molding Station (6-Cavity Mold): The heart of the machine. The heated preforms are transferred into a water-cooled mold block containing six precise cavities, each defining the final bottle's shape.

   • Stretch Rod: A mechanical rod stretches the preform longitudinally.

   • High-Pressure Blow: Compressed air (typically 35-40 bar) is injected, expanding the preform radially to conform exactly to the mold's contours, creating the bottle.

5. Ejection System: After a brief cooling period, the mold opens, and the finished bottles are automatically ejected onto a conveyor belt for inspection or direct routing to a filling line.

6. Hydraulic & Pneumatic System: Provides the power for mold clamping, movement of stretch rods, and other mechanical actions.

7. Advanced PLC Control System: The machine's brain. A touch-screen HMI (Human-Machine Interface) allows operators to set, monitor, and record all parameters (temperatures, pressures, timings) for consistent, repeatable quality.

Technical Advantages and Features

• Optimized Production Output: Ideal for medium-scale production, offering a superb output rate (typically 1,800 - 2,500 bottles per hour, depending on bottle size and cycle time).

• Excellent Energy Efficiency: Compared to larger machines, a 6-cavity model often has a lower energy footprint per bottle, especially when equipped with servo motors for precise movement control and energy recovery systems.

• Superior Bottle Quality: Precise temperature control in the oven and consistent high-pressure blowing ensure excellent material distribution, high transparency, and superior mechanical strength (top-load performance) in the final bottles.

• Quick Mold Changeovers: Our designs facilitate rapid mold and format changes, minimizing downtime when switching between different bottle production runs.

• Robust and Reliable Construction: Built with high-grade materials and components to ensure 24/7 operational reliability and a long service life with minimal maintenance.

Target Applications

This machine is perfectly suited for producing a wide range of PET containers, including:

• Carbonated Soft Drinks (CSD) bottles (500ml, 1L, 1.5L, 2L)

• Still & Mineral Water bottles

• Edible Oil bottles

• Juice & Tea bottles

• Detergent & Household Chemical containers

Why Choose Our 6-Cavity Blow Molding Machine?

As your specialized manufacturer, we don't just sell a machine; we provide a total solution. Our machines are backed by comprehensive technical support, training, readily available spare parts, and custom engineering to meet your specific production goals.