Polyester vacuum bag (PET)
The polyester vacuum bag is a vacuum bag material made of polyethylene terephthalate as a material, which is formed into a thick sheet by extrusion and then biaxially stretched. It is a colorless, bright and lustrous vacuum bag with excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, conflict resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and aroma retention. Well, it is one of the commonly used barrier composite vacuum bag substrates. However, the price of the polyester vacuum bag is relatively high, usually 12 μm in thickness, and is commonly used as the outer layer of the retort package, and the printing property is good.
Nylon vacuum bag (PA)
Nylon vacuum bag is a very tough vacuum bag with good transparency, good gloss, high tensile strength, high tensile strength, good heat resistance, cold resistance, oil resistance and organic solvent resistance. Excellent in abrasion resistance and puncture resistance, and soft in contrast and good in oxygen barrier, but it has poor barrier to water vapor, high moisture absorption and moisture permeability, and poor heat sealability. It is suitable for packaging hard articles. For example, greasy foods, meat products, fried foods, vacuum packed foods, cooked foods, and the like.