In the transport and storage of bulk materials such as industrial cement and agricultural fertilizers, the durability, sealing integrity, and functionality of packaging bags directly impact product quality. For applications like aquaculture feed and chemical fertilizers, bags must offer moisture resistance, tear strength, and high-quality printability, while also supporting customized designs to meet specific corporate branding requirements.
Key materials include plastics, PP (polypropylene), composite films, and composite materials. PP serves as the structural backbone due to its chemical corrosion resistance and tensile strength. Meanwhile, composite films utilize multi-layer co-extrusion technology to combine films with distinct functions-such as moisture-proof and barrier layers-into a unified structure that provides three-dimensional protection: an abrasion-resistant outer layer, a moisture-proof middle layer, and a puncture-resistant inner layer. For instance, fertilizer bags often employ a "PP woven fabric + PE composite film" structure; this configuration is capable of bearing loads exceeding 50 kg while effectively blocking atmospheric moisture to prevent the fertilizer from caking.