What's the difference between PA+PE and PET+PE food vacuum bags?

Okay, this is a very technical and frequently asked question. 

PA+PE and PET+PE are the two most commonly used composite materials for food vacuum bags. 

The difference between them stems primarily from the properties of the outer layers: PA (nylon) and PET (polyester).

1. PA+PE (Nylon + Polyethylene) Vacuum Bag

Structure: Outer layer: Nylon (PA), inner layer: Polyethylene (PE).

Advantages: Toughness and durability are its hallmarks. The nylon layer provides excellent puncture and abrasion resistance, resisting brittleness even when frozen. It also offers excellent high-temperature resistance (suitable for retorting).

Disadvantages: Higher cost, and weaker moisture barrier (water vapor barrier) than PET.

In short, it's a "muscle competitor," focusing on durability and tear resistance, suitable for use with sharp items or when freezing or retorting.

2. PET+PE (Polyester + Polyethylene) Vacuum Bag

Structure: Outer layer of polyester (PET), inner layer of polyethylene (PE).

Advantages: Stiffness and aesthetics are its hallmarks. The PET layer provides extremely high tension and rigidity, giving the bag a crisp appearance and enhancing product display. It also offers excellent gas and water vapor barrier properties and exceptional transparency. Cost is also a major advantage.

Disadvantages: Relatively brittle, and lacks the flexibility and puncture resistance of PA+PE.

In short, it's a "look-oriented" bag, focusing on barrier properties, display quality, and cost-effectiveness, making it suitable for most common dry goods and snacks.

How to Choose?

For packaging "hard goods": such as bones, frozen meat, nuts, and spiny seafood, PA+PE is the preferred choice for its increased safety.

For packaging "aesthetics and barrier properties": For biscuits, powders, tea, and other common snacks, high transparency and optimal display are key, making PET+PE a more economical choice.

Higher requirements: For high-end products that require long-term freshness, more complex composite structures such as PET/PA/PE or PET/AL/PE (including aluminum foil) are often used to combine the advantages of multiple materials.