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PET Industry Air Compressors
20-40bar PET Compressor
Application of air compressor in bottle blowing industry
In the blow molding industry, 20-40 bar compressors are essential equipment for ensuring bottle molding quality and production efficiency. They are used throughout key stages of blow molding:
During the blow molding process, after the preform is preheated, the softened preform is fed into the mold. A high-pressure airflow of 20-40 bar is instantly injected into the preform through a blow needle. The powerful air pressure rapidly expands the preform, allowing it to fit tightly to every detail of the mold's inner wall. From the threaded structure of the bottle neck to the contoured lines of the bottle body and the support design at the bottom, each is precisely replicated, ensuring a uniform appearance and precise dimensions.
High-pressure compressors are even more crucial for large-capacity plastic bottles (such as 10L drinking water jugs) and pressure-resistant bottles (such as carbonated beverage bottles). Large-volume bottles require sufficient air pressure to overcome the resistance of the preform during expansion, preventing areas where the bottle cannot be blown open. During the molding process for pressure-resistant bottles, high pressures of 20-40 bar allow the PET molecules to fully crystallize after stretching, resulting in a uniform wall thickness and a stable structure. This allows the PET to withstand the internal pressure of subsequent filling (typically 3-5 bar), reducing the risk of deformation or bursting.
In high-speed blow molding lines, the dozens or even hundreds of blow molding cycles per minute place extremely high demands on the instantaneous air supply capability. A 20-40 bar compressor delivers stable high-pressure air from a gas tank, ensuring consistent pressure during each blow molding cycle. This prevents problems such as weight and wall thickness variations caused by pressure fluctuations, ensuring continuous and stable operation of the line and improving overall production efficiency.
Furthermore, the molding of some special-shaped bottles, such as cosmetic bottles and irregularly shaped packaging bottles, also relies on high-pressure airflow. Their complex shapes require even higher air pressure to drive the preform into the mold's specialized structure, ensuring complete molding of all parts of the bottle body and meeting diverse packaging needs.
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