Commonly used materials for packaging and printing
Paper: white cardboard, coated paper, kraft paper, etc
It is used to make cartons, paper bags, etc.
Plastics: PE, PP, PET, etc., used to make plastic bags, bottles, etc.
Metals: aluminum, iron, etc., used to make cans, metal cans, etc.
Glass: used to make glass bottles, glass jars, etc. Composite materials: composed of two or more materials, such as paper-plastic composite, aluminum-plastic composite, etc.