Blow molded bottles have become one of the mainstream containers in the field of food packaging due to their food grade material characteristics and excellent molding processes. In terms of material selection, high-density polyethylene (HDPE) and polyester (PET) are the core materials, among which HDPE is widely used in the packaging of foods such as milk, jam, and natural juice due to its good oil resistance; PET material, with its advantages of high transparency and good airtightness, has become the preferred packaging for hot canned beverages such as tea drinks and fruit juice. Its glass like appearance can also enhance the attractiveness of product display. ​