How To Select Aluminum Foil Bag Materials?
Aluminum foil bags are no stranger to most people. They belong to a category of composite bags that contain aluminum foil, made by laminating aluminum with other high-barrier materials through dry compounding. Aluminum is lightweight, reflective, highly barrier-resistant, impermeable to air and water, adaptable to temperature changes, stable in shape under high or low temperatures, offers excellent light-blocking properties, and provides superior moisture resistance. As a result, aluminum foil bags exhibit outstanding moisture barrier, gas barrier, light protection, puncture resistance, and durability. Additionally, aluminum foil bags are not limited by material constraints in packaging design—they can be customized into various styles such as flat pouches, stand-up bags, and gusseted bags. Below, let’s explore aluminum foil bags with Dongguan Wanhao Package.
Although aluminum foil bags have the above advantages, their material selection is not fixed—it depends on the final application, packaged contents, subsequent processing techniques, and usage conditions. For example:
The inner layer of aluminum foil bags for packaging wasabi and pickles is typically PE, because pickles contain liquid and are stored at around 0°C, making PE suitable.
For steamed meat products, the outer layer material is usually CPP, as it performs well under high temperatures.
For powdered products like milk powder, the inner layer is also often made of PE.
Beyond the packaging itself, factors such as contamination resistance and impact resistance must also be considered. For instance:
If packaging non-autoclaved meat products, CPP is not ideal because it becomes brittle below 10°C, making it unsuitable for low-temperature storage.
Conversely, PE has excellent low-temperature resistance but may harden at temperatures exceeding 65°C. Therefore, it’s advisable to choose modified heat-seal materials based on specific usage conditions.
Additionally, the thickness of the packaging bag varies depending on the product. For vacuum-packed products, thicker materials are preferred because thicker aluminum foil bags offer better sealing performance, meeting stricter packaging requirements—though at a higher cost.
