Blow molding machines are primarily used to transform preforms into finished bottles. In China, these machines are mainly categorized based on the type of plastic material they process, such as PET blow molding machines and those designed for other plastic materials.

An increasing number of perishable foods are now being packaged using plastic blow molding machines. Foods processed through this method benefit from extended freshness and a significantly prolonged shelf life.

The quality difference between fully automatic and semi-automatic blow molding machines is minimal. Bottles produced by fully automatic machines are slightly better, but there is no significant difference in the quality of the bottles produced.