Explore the first step in making plastic bottles: the production process of bottle preforms

In the filling machine industry, preform usually refers to the initial molded body in the production process of plastic bottles, also known as preform or preform. Bottle preform is the first step in making plastic bottles. It is an uninflated, hollow plastic form that has been pre-heated and injection molded but has not yet been formed into the final product.

Normally, the production process of bottle preforms is divided into the following steps:

Raw material proportioning: First, the raw materials are accurately proportioned according to the requirements of plastic bottles. Usually the raw material of bottle preforms is plastic raw materials such as PET (polyethylene terephthalate).

Heating pretreatment: The raw material particles are dried and heated to reach the appropriate temperature and humidity for subsequent injection molding.

Injection molding: Heat-treated plastic particles are injected into the mold of the bottle blowing machine. Under the action of high pressure, the plastic material is extruded into the shape of the mold to form an uninflated plastic bottle preform.

Cooling and solidification: After the plastic bottle preform is formed, it needs to be cooled in the mold to quickly solidify the plastic material to facilitate subsequent processing and handling.

Demolding: After cooling and solidification, open the mold and take out the formed bottle preform.

After the preform is formed, subsequent processing is usually required, such as edge trimming, tube cutting, deburring, etc., in order to finally obtain a plastic bottle with complete molding and good quality. The production quality and craftsmanship of the preforms directly affect the quality and performance of the final plastic bottle. Therefore, in the filling machine industry, the production process of the preforms is very important.