Introduction To Retort Pouches

Retort pouches are a type of special flexible packaging material widely used in the food packaging industry. Their main function is to maintain the quality and safety of food under high-temperature cooking conditions. These pouches are typically composed of multiple layers of composite materials. The core layer may include aluminum foil, polyester (PET), nylon (PA), or polypropylene (PP), etc. The layers are tightly bonded together using adhesives or co-extrusion processes to form a composite structure with excellent barrier properties, heat resistance, and mechanical strength. Aluminum foil is widely used due to its excellent barrier properties (such as against oxygen, water vapor, and light), effectively extending the shelf life of food. Furthermore, the high-temperature resistance of aluminum foil (typically able to withstand cooking at 120°C to 135°C) makes it a key component of retort pouches.