What is the barrier performance of aluminum foil bags

Aluminum foil bag is a bag made by compounding various plastic films and using a bag making machine. Aluminum foil bag, also known as pure aluminum bag, usually refers to aluminum-plastic composite vacuum packaging bag. Aluminum foil bags often adopt a four layer structure, which has good water and oxygen barrier functions. Aluminum foil bags are not limited and can be customized to different specifications and styles, such as flat pockets, three-dimensional bags, organ bags, etc.
The barrier performance of aluminum foil bags is very good, mainly reflected in the following aspects:
1、 Gas barrier performance
Aluminum foil bags can effectively isolate gases such as oxygen, nitrogen, and carbon dioxide, thereby avoiding their impact on the product. This is crucial for protecting the quality and taste of products such as food, medicine, electronic components, etc. For example, in food packaging, aluminum foil bags can prevent food oxidation and spoilage, extending the shelf life of food; In electronic component packaging, aluminum foil bags can prevent components from getting damp and corroded, ensuring stable performance of the components.
2、 Moisture and waterproof performance
The moisture-proof and waterproof performance of aluminum foil bags is also very excellent, which can prevent external moisture from entering the packaging bag, thereby keeping the product dry. This is particularly important for products that require moisture and water resistance, such as pharmaceuticals, precision instruments, etc.
3、 High and low temperature resistance performance
Aluminum foil bags can maintain stable mechanical properties in both high temperature (such as 121 ℃) and low temperature (-50 ℃) environments, making them suitable for use as cooking bags. This feature makes aluminum foil bags particularly popular in packaging for food, medicine, and other fields. At the same time, the heat resistance of aluminum foil bags is also reflected in their thermal insulation performance, which can effectively prevent the influence of external temperature changes on the packaged items, thereby maintaining their quality and taste.
4、 Light shielding performance
Aluminum foil bags can effectively block light and prevent harmful factors such as sunlight and ultraviolet rays from affecting the product. This characteristic is crucial for protecting the color and nutrition of products, especially for products that are sensitive to light such as tea, coffee, etc.
5、 Barrier performance verification
The barrier performance of aluminum foil bags can be verified through various methods, such as pressure difference method to test gas permeability. These testing methods can accurately evaluate the barrier performance of aluminum foil bags against gases such as oxygen, nitrogen, and carbon dioxide, ensuring that the quality of aluminum foil bags meets relevant standards and requirements.
In summary, aluminum foil bags have been widely used in various industries such as food, medicine, and cosmetics due to their excellent barrier properties. When choosing aluminum foil bags, it is recommended to select the appropriate type and specifications of aluminum foil bags based on the specific needs and packaging requirements of the product.