Spouted pouches require a high-strength composite structure: BOPA (nylon) provides puncture and drop resistance; PET (polyester) offers rigidity and printability; AL (aluminum foil) or a high-barrier film protects the contents; and specialized PE (polyethylene) ensures strong sealing.
A core manufacturing challenge is the "dissimilar material welding" between the spout and the film. This requires balancing heat-sealing pressure and employing a multi-stage sealing process-using multiple sealing bars to apply gradual pressure-to ensure a pinhole-free seal around the spout edge and achieve zero leakage.
Production control focuses on securely bonding the spout to the pouch body via heat sealing (using PE or PP) to create a hermetic package and ensure structural integrity.
Key performance metrics include opening force (balancing a secure seal with ease of opening) and pressure resistance (simulating stacking loads during logistics); finished pouches must withstand a static load of 40–60 kg for one minute without rupturing.
Spout specifications must match the automatic filling heads of filling machines, typically featuring standard diameters such as 8.5 mm, 10 mm, or 15 mm.
Cap designs may utilize two-color injection molding, combining high-density polyethylene (HDPE) with elastomeric materials to provide a non-slip grip and reduce the torque required for opening.