The following are some common shaped bag materials:
1. Plastic materials:
Polyethylene (PE): (LDPE), (HDPE), etc., with good flexibility and impact resistance.
Polypropylene (PP): with high strength and heat resistance
Polyethylene terephthalate (PET): (PET): with high strength and transparency.
Bi-oriented polypropylene (BOPP): with good tensile strength and printing adaptability.
2. Composite materials:
-Multilayer composites: such as PE/PP, PE/PA/PE, etc., combining the advantages of different materials to provide better physical properties and barrier properties.
Aluminium foil composites: a layer of aluminium is coated on the plastic film to provide good barrier and light blocking properties.
The following factors need to be considered when selecting materials for shaped bags:
1.The characteristics of the product: such as weight, shape, whether barrier properties are required, etc.
2. Functions of the packaging: e.g. protection, portability, reusability, etc.
3. Environmental impact: whether it is necessary to use environmentally friendly or biodegradable materials.
4. Cost budget: the cost difference of different materials.