A PET preform is essentially a test-tube-shaped piece of PET plastic that undergoes a blowing process to form a finished bottle. The PCO PET preform refers to a preform designed with the PCO (Plastic Closures Organization) finish, a specific neck and thread standard used predominantly for carbonated soft drinks (CSD), water, and other beverages.

PCO PET preforms differ from regular PET preforms mainly in their neck finish, which aligns with PCO standards to ensure compatibility with PCO closures (caps). These preforms are manufactured with precise dimensions to guarantee a secure fit with caps and optimal bottle performance.

The structure of a PCO PET preform can be broken down into several parts:

Neck/Finish: The PCO finish is designed to interface perfectly with PCO caps. It typically features a thread design and sealing surface optimized for pressure retention in carbonated beverages.

Body: The cylindrical body of the preform is thick enough to provide structural integrity during handling but designed to stretch uniformly during blow molding.

Base: The thicker base allows for stability and supports the bottle's bottom shape after blowing.

Material: Made from high-quality PET resin, known for its clarity, strength, and gas barrier properties.

PCO preforms come in various weights and lengths depending on the final bottle size and application requirements. Typical weights range from around 14 to 40 grams, and lengths vary to accommodate different bottle volumes, such as 500ml, 1-liter, or 2-liter bottles.

https://www.petpreformfactory.com/product/pet-preform/28mm-pet-preform-with-air-seal/
The 28mm PET Preform with Air Seal is meticulously designed to meet the evolving needs of the packaging industry. Its carefully engineered structure ensures good performance, maintaining the integrity of the contents while providing a secure seal.