Bottle preforms are a key intermediate product in the production of plastic bottles and are widely used in the beverage, food, and daily chemical industries.
Bottle preforms are semi-finished products formed by injection molding, where raw materials are filled into a mold under specific temperature and pressure. Blow molding can then produce packaging containers such as plastic bottles and cosmetic boxes. These are called bottle preforms in English. The main raw materials used include thermoplastic resins such as PE, PC, PS, and PET. PET is widely used in food packaging due to its high transparency. The production process requires injection molding machines, molds, and a cleanroom. The process is divided into a one-step (hot preform method) and a two-step (cold preform method). The former utilizes waste heat for direct blow molding, while the latter requires secondary heating before forming.
Shape Characteristics: Bottle preforms are typically tubular, with an open end and a closed bottom at the other. The open end has a larger diameter to facilitate gripping and inflation during subsequent blow molding. The length and diameter of the preforms depend on the specifications of the final plastic bottle. Material characteristics: Most preforms are made of PET, which has good transparency, glossiness, mechanical strength, and chemical resistance. It is also easy to process and shape, and meets the hygiene requirements for food, beverage, and other packaging materials.