Polypropylene (PP) is a thermoplastic polymer with strong corrosion resistance, heat resistance, and mechanical strength, making it suitable for manufacturing various sealing materials. Compared to polyethylene, PP has higher crystallinity, superior tear strength, and excellent low-temperature resistance, making it more suitable for applications requiring high sealing performance, such as waterproofing, moisture protection, and food preservation.
While PP inherently possesses some sealing properties, its effectiveness is typically enhanced through processing techniques and design. For example, in plastic bag manufacturing, high-frequency heat sealing or hot-melt adhesive bonding techniques are used to ensure a complete seal at the bag opening. Furthermore, different structures and designs are employed based on the specific application requirements, such as increasing thickness and reinforcing joints.
