Air Compressor for PET Blowing Industry

Opt for Our Oil-Free Air Compressor for Your PET Bottle Blowing Operations

PET Air Compressor

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No more high maintenance costs

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The Process of PET Bottle Blowing Industry

Principles of the PET Bottle Blowing Process
The PET bottle blowing process relies on the physical behavior of polymers. When heated, PET particles melt and stretch, forming a thin film. This technique, known as biaxial stretching, improves the mechanical properties of the bottle wall, boosting its tensile, stretching, and impact strength. Additionally, it enhances the bottle’s sealing capabilities.

PET Blow Molding Industrial Process

Demolding & processing

After cooling is completed, the bottle is removed from the mold and may require further processing, such as cleaning, inspection, printing, or labeling.

The Role of Air Compressor in PET Bottle Blowing Industry

Throughout the entire PET bottle blowing process, the air compressor plays a vital role during the blow molding stage. It needs to deliver adequate compressed air pressure to swiftly and uniformly shape the preform into the desired bottle form. The quality of the compressed air—free from oil, moisture, and contaminants—directly impacts the bottle’s quality. Any impurities can lead to defects or compromise hygiene. This is particularly critical in the food and beverage packaging industry, where oil-free compressors are essential to ensure the final product adheres to food safety standards.

Pressure Regulation:
Accurate control of compressed air pressure is crucial for ensuring consistent wall thickness in bottles. Low pressure can lead to incomplete formation, while high pressure might cause deformation or breakage. Therefore, the compressor must deliver a stable and precise pressure output.

Cooling and Pressure Maintenance:
Post-blow molding, compressed air assists in the cooling phase, helping the bottle retain its shape until it fully cools and solidifies. Maintaining constant pressure during the cooling phase is also vital for the bottle’s stability and capacity.

Enhancing Production Efficiency:
A high-performance air compressor provides the necessary compressed air to support rapid production rates, thus boosting the overall output of the bottle blowing production line.

Environmental and Energy Efficiency:
Modern air compressors are designed with a focus on energy efficiency, reducing power consumption, lowering operational costs, and minimizing environmental impact.

Why Choose Our Air Compressor?

In general, compressed air should be purified before use to eliminate contaminants. Common pollutants include solid particles, water vapor, moisture, and oil vapor, particularly in systems handling lubricating oil, pipelines, air tanks, and oil-injected air compressors.

When compressed air is used in direct contact with drinking water, beverages, or edible oils, it is crucial to ensure its purity and cleanliness to avoid contamination. The following steps should be taken:

Moisture Removal:
Moisture encourages the growth of microorganisms and fungi. If moisture is present in the compressed air lines, it can be transferred onto the product, packaging, or containers. To prevent this, a dryer is essential to achieve the necessary dew point. For compressed air in direct contact with products, the dew point should reach -40°C, usually achieved with a desiccant dryer. For low-risk, non-contact air, a dew point of 3°C is sufficient, typically using a refrigerated air dryer.

Oil Removal:
Even if using an oil-free compressor, there is oil vapor present in the air due to natural atmospheric conditions. To address this, a filter is required. Oil-free compressors must be used for air that comes into direct contact with products, ensuring Class 0 purity—100% oil-free air—eliminating any health risks tied to oil contamination. For non-contact applications, oil-lubricated compressors may be used with a filter to maintain an oil content of 0.003 ppm.

Particle Removal:
The atmosphere contains solid particles and dust that could lead to contamination when in contact with the product. Additionally, particles may originate from the internal components of the compressor system. A filter is necessary to ensure the particle size does not exceed 0.01μm.

Pure oil-free water-lubricated screw air compressor VS traditional dry oil-free screw air compressor

                      Compressed air quality advantages：

                      Running costs and other benefits：

How to Choose Air Compressor Suitable for PET Bottle Blowing?

Choosing an air compressor suitable for the PET bottle blowing industry is a key decision that directly affects production efficiency, product quality, and operating costs. The following are the main factors to consider when choosing an air compressor:

• Compressor type:
  Oil free piston compressor: suitable for high-pressure, medium and small flow applications.
  Oil free screw compressor: suitable for high flow and continuous operation, with high reliability and energy efficiency.
  Centrifugal compressor: suitable for extremely high flow and medium pressure requirements, but with high initial investment.
• System integration and control:
  Consider the compatibility between the compressor and existing production lines, as well as whether there is an intelligent control system, such as variable frequency drive (VFD), to achieve on-demand gas supply and reduce energy waste.
• Maintenance and after-sales service:
  Confirm the maintenance needs of the compressor and the replacement cycle of vulnerable parts, as well as the warranty and support services provided by the manufacturer.
• Environmental conditions:
  Consider the operating environment of the compressor, such as temperature, humidity, and installation space, and choose a compressor model that is suitable for the site conditions.
• Industry certification and standards:
  Ensure that the compressor complies with relevant industry standards and safety regulations, such as ISO 8573-1 air quality standards.