Polypropylene (PP) and polyethylene (PE)
The main materials of container bags (also known as ton bags or flexible container bags) are polypropylene (PP) and polyethylene (PE), among which polypropylene is more widely used. The following is a specific analysis:
1. Mainstream materials
Polypropylene (PP)
Features: Lightweight (density 0.89-0.92 g/cm³), wear-resistant, chemical-resistant, and easy to process into high-strength woven fabrics.
Application: After melt extrusion and stretching into filaments, it is woven into a base fabric to make ordinary woven fabric ton bags or anti-static ton bags.
Polyethylene (PE)
Features: Better flexibility, but slightly lower strength than PP, often used in scenarios with high requirements for low temperature resistance.
2. Other auxiliary materials
Some special-function container bags will be compounded with the following materials:
Polyester (PET) or nylon: Improve wear resistance and tear resistance.
Aluminum foil layer: used for aluminum-plastic ton bags, providing heat insulation, moisture resistance and anti-electromagnetic interference functions, commonly used in new energy battery raw material packaging.
Conductive wire: used for antistatic ton bags, eliminating the risk of static electricity during shipping through grounding.
3. Selection basis General use: PP woven bags (such as transporting cement, feed, etc.).
Special needs: composite materials need to be selected according to material properties (such as moisture resistance, antistatic, etc.).
