How to distinguish between pure aluminum bags and aluminum coating bags?

Aluminum foil bag packaging usually refers to aluminum composite packaging bags. It has good water and oxygen barrier functions. Can be made into flat bags, zipper bags and other styles.

Aluminum foil bags can be divided into pure aluminum bags and aluminum coating bags.

The pure aluminum bag is made by pressing pure metal aluminum. The thinnest thickness can reach 0.0065mm. Although it is very thin, it has a great effect after being compounded with plastic. After being compounded with more than one layer of plastic, the barrier properties, sealing properties, fragrance retention, shielding properties and other functions of the plastic can be improved.

The aluminum coating bags are coated with high-purity metal aluminum evenly on the plastic film in a high-temperature vacuum state. Because they are coated on plastic, the metal aluminum is mainly used for decoration, and it does not help to improve the barrier properties of the material. 

How to distinguish these two bags in daily life? OK, let me explain to you.

The difference:

1. In terms of material, the pure aluminum bag is pure aluminum without impurities; the aluminum coating bag is mixed with composite materials

2. In terms of cost, the price of pure aluminum bags will be more expensive.

3. In terms of performance, the pure aluminum bag has a better moisture-proof and cooling effect than the aluminum coating bag, the pure aluminum bag is completely protected from light, and the aluminum coating bag has a shading effect.

4. In terms of use, pure aluminum bags are more suitable for cooked food, meat, medicine and other products, while aluminum-plated bags are suitable for tea, powder, etc.

5. Put the inside of the bag against the light of the sun, the light that can be seen through the bag is the aluminum coating, the invisible is pure aluminum 

The following points can distinguish pure aluminum bags and aluminum coating bags:

1. Watch: Because the brightness of pure aluminum is not as bright as that of aluminum coating. Aluminum coating bags can illuminate people's shadows, except for those with aluminized matting film. The appearance of aluminized matting film is very similar to that of pure aluminum. You can block the mouth of the bag and look inside the bag through strong light. The inside of the aluminum foil bag does not transmit light.

2. Hand feeling: The hand feeling of a pure aluminum bag is thick and hard, and the hand feeling of an aluminum coating bag is lighter and softer than a pure aluminum bag.

3. Folding: pure aluminum bags are more prone to creases

4. Twisting: After the pure aluminum bag is twisted, the coalescence is not easy to rebound, and the aluminum layer will be broken. After twisting the aluminum coating bag, the kinks will bounce away soon after twisting.

5. Fire: Pure aluminum is not easy to burn with a fire point, the aluminum layer will roll back, and the aluminum foil packaging will leave gray aluminum slag after burning. Different plastic films may burn when the aluminum coating bag is fired, and there is no residue of aluminum slag.