Fully Automatic PET Stretch Blow Moulding Machine

The SPI AY Series is designed for automated PET bottle production where consistent output, reduced manual handling and controlled processing are important.

The available configurations include:

Actual production output can vary depending on preform weight, bottle design, bottle volume, mould configuration and operating conditions.

A fully automatic PET stretch blow moulding machine is a production system used to convert PET preforms into finished bottles through a controlled heating, stretching and blowing process.

Unlike systems requiring significant manual handling, a fully automatic machine integrates the major stages of bottle production into an automated cycle.

The PET preform is first heated to the appropriate forming temperature. It is then transferred into the mould, stretched vertically and expanded using compressed air until it takes the shape of the mould cavity.

The finished bottle is subsequently ejected and can be transferred to the next stage of the packaging line.

This technology is widely used for manufacturing lightweight PET bottles with consistent dimensions, controlled material distribution and repeatable production quality.

The bottle manufacturing process consists of several controlled stages.

PET preforms are supplied to the machine's feeding system. Automatic handling reduces the need for continuous manual intervention and supports a more consistent production cycle.

The PET preform passes through the heating section where its temperature is controlled before the blowing process.

The heating stage is critical because PET must reach the appropriate forming condition for effective stretching and material distribution.

After heating, the conditioned preform is transferred into the moulding section in the correct orientation.

The mould closes around the preform and holds it in position during stretching and blowing.

Accurate mould alignment and clamping help maintain bottle dimensions and reduce unwanted parting-line variation.

A stretch mechanism extends the heated preform along its vertical axis.

Controlled stretching helps distribute the PET material throughout the bottle body before the final blowing stage.

Compressed air is introduced into the stretched preform.

The PET expands against the mould cavity and takes the required bottle shape.

After forming, the bottle is cooled sufficiently for removal from the mould.

The finished PET bottle is then automatically discharged for transfer to subsequent production or packaging operations.

The SPI AY Series offers configurations delivering up to 6,000 BPH, depending on the selected model and bottle application. This makes higher-cavity configurations suitable for manufacturers requiring increased bottle production.

The machine automates the major stages of PET bottle production, including preform handling, heating, blowing and bottle ejection.

Automation helps reduce repetitive manual operations and supports consistent production cycles.

The machine uses a layered heating arrangement to condition PET preforms before stretching and blowing.

Controlled heating is important for achieving consistent material distribution and bottle quality.

Reflectors positioned close to the preforms help improve heat transfer within the oven and support efficient heating operation.

The preform feeding arrangement is designed to maintain controlled movement from the elevating section through the orientation process.

The machine uses robust components designed for extended service life and reduced frequency of component replacement.

The machine is equipped with an OMRON PLC with touchscreen keypad for machine control and operation.

Depending on production requirements, the SPI AY Series is available in:

• 2-cavity configuration
• 4-cavity configuration
• 6-cavity configuration

Selecting the appropriate cavity configuration allows manufacturers to balance bottle size, production output and investment requirements.

The following specifications are based on the current SPI AY Series configurations.

Specifications may vary according to machine configuration, mould design, preform characteristics and production conditions.

Selecting a PET bottle blowing machine should begin with the required bottle size and production volume.

For example:

For high-volume production of 600 ml bottles, the SPI AY600 configurations provide:

• 4-cavity production up to 4,000 BPH
• 6-cavity production up to 6,000 BPH

This configuration can be considered for high-volume applications such as packaged drinking water and other single-serve beverages.

The SPI AY1500 models are available in:

• 2-cavity configuration – up to 2,000 BPH
• 4-cavity configuration – up to 3,600 BPH

The SPI AY2000 models provide:

• 2-cavity configuration – up to 1,800 BPH
• 4-cavity configuration – up to 3,600 BPH

The appropriate configuration should be selected according to required production volume, bottle design and available utilities.

PET stretch blow moulding machines are used across a wide range of packaging applications.

PET bottles for still water require consistent dimensions, suitable wall distribution and reliable production at high volumes.

The higher-cavity SPI AY configurations can be considered for single-serve water bottle applications where production volume is a major requirement.

CSD bottles require suitable bottle design and controlled PET material distribution to withstand internal pressure.

The stretching and blowing process helps form the required bottle geometry according to the selected mould.

PET packaging is widely used for juices, flavoured beverages and other liquid products.

The appropriate machine and mould configuration can be selected according to bottle volume and production target.

PET containers can be used for selected dairy and milk-based liquid packaging applications.

PET bottles are used for various food and liquid packaging requirements, including selected sauces and other packaged liquids.

PET containers are also suitable for selected detergent and household-liquid applications where the bottle design and material specifications meet the product requirements.

Cavity count is one of the most important factors when selecting a fully automatic PET bottle blowing machine.

A 2-cavity configuration produces two bottles during each moulding cycle.

It can be suitable when:

• Production volume is moderate
• Bottle size is relatively larger
• Initial machine investment needs to be controlled
• Production requirements are below high-volume levels

A 4-cavity configuration can significantly increase output compared with a 2-cavity machine.

For the SPI AY Series, 4-cavity configurations are available for 600 ml, 1.5 L and 2 L applications.

A 6-cavity configuration is designed for higher production requirements.

The SPI AY600-6 is rated for up to 6,000 BPH for 600 ml containers, making it suitable for high-volume single-serve bottle production.

The correct cavity count should be selected based on bottle size, target production, preform specifications, machine cycle and available utilities.

Both fully automatic and semi automatic PET blow moulding machines have different applications.

A fully automatic machine is suitable when the manufacturer requires:

• Higher production output
• Reduced manual handling
• Consistent production cycles
• Automated preform handling
• Continuous production
• Better integration with downstream packaging operations

A semi automatic machine can be considered when:

• Production volume is moderate
• Manual handling is acceptable
• Initial investment needs to be lower
• Production flexibility is more important than maximum automation

The choice should be based on production volume, manpower availability, bottle size, factory layout and future expansion plans.

Choosing the right machine requires more than comparing BPH figures.

Identify the exact bottle size required, such as 600 ml, 1.5 L or 2 L.

Estimate the number of bottles required per hour and per day.

This will help determine whether a 2-, 4- or 6-cavity configuration is appropriate.

Bottle diameter, bottle height and neck diameter must remain compatible with the selected machine and mould.

Preform weight, neck finish, dimensions and design influence the final bottle and machine performance.

High-pressure and low-pressure air requirements must be considered before machine installation.

The compressor and air treatment system should be designed according to the machine's actual requirements.

Connected load and actual operating consumption should be considered while calculating production costs.

The machine requires controlled cooling conditions. Chiller temperature and water requirements should be included in the plant utility planning.

If production is expected to increase, selecting a higher-cavity configuration may provide greater capacity for future requirements.

PET bottle production begins with the PET preform.

The preform already contains the required neck finish and is heated in the stretch blow moulding machine.

During the production cycle:

The final bottle shape is determined by the mould cavity, while the preform design, heating conditions, stretching ratio and blowing parameters influence the final bottle characteristics.

Correct process control is therefore essential for maintaining consistent bottle dimensions and material distribution.

Preform heating is one of the most critical stages of the stretch blow moulding process.

If the preform is not heated appropriately:

• Bottle dimensions may become inconsistent
• Material distribution can become uneven
• Bottle clarity may be affected
• Stretching performance can change
• Bottle strength may be affected

The SPI AY Series uses a layered heating system to provide controlled heating of PET preforms before the stretching and blowing stage.

Reflectors positioned close to the preforms help optimise heat transfer within the heating section.

Compressed air is an essential utility for PET stretch blow moulding.

The SPI AY Series specifications include both low-pressure and high-pressure air requirements.

Depending on the model, the machines have:

• LP working pressure: up to 10 bar
• Maximum blowing pressure: up to 30 bar
• LP air consumption: approximately 1.6–2 m³/min
• HP air consumption: approximately 1.6–2.5 m³/min

The exact air-system design should be determined according to the selected machine, bottle specification, production rate and plant conditions.

Proper compressor sizing, air quality and pressure stability are important for reliable PET bottle production.

A machine with the highest BPH is not automatically the best machine for every application.

For example, a manufacturer requiring 1.5-litre bottles at a moderate production volume may not need the highest-cavity configuration.

Similarly, a high-volume 600 ml water bottle producer may benefit from a 6-cavity configuration capable of up to 6,000 BPH.

The correct machine should therefore balance:

• Bottle size
• Production target
• Number of cavities
• Preform weight
• Bottle design
• Air requirements
• Power consumption
• Chiller requirements
• Available floor space
• Future production expansion

Regular preventive maintenance helps maintain machine performance and reduce unexpected production interruptions.

Important maintenance areas include:

Inspect heating elements, reflectors, ventilation and temperature-control components regularly.

Keep mould surfaces clean and inspect alignment and clamping components.

Check air pressure, filters, hoses, valves and connections.

Ensure that preform movement remains smooth and correctly oriented.

Maintain appropriate chiller temperature and inspect cooling-water circulation.

Regularly inspect PLC, sensors, electrical connections and control components.

A preventive maintenance schedule should be established according to machine operating hours and manufacturer recommendations.

If you are planning to start or expand PET bottle production, selecting the correct Fully Automatic PET Stretch Blow Moulding Machine is essential for achieving the required production volume and consistent bottle quality.

Share your requirements with Suraj Plastic Industries, including:

• Required bottle capacity
• Bottle design
• Production target in BPH
• PET preform specification
• Required cavity configuration
• Application
• Available factory utilities

The appropriate SPI AY Series configuration can then be evaluated according to your production requirements.

Suraj Plastic Industries provides fully automatic PET stretch blow moulding solutions with multiple cavity configurations and production capacities of up to 6,000 BPH.

Contact Suraj Plastic Industries for machine specifications, configuration details and application-specific assistance.