What are the materials of the packaging bag？

Different materials of packaging bags for different purposes, but few people can distinguish, so let us take a look at the following several materials and their main uses of packaging bags.

1. aluminum foil material

Aluminum foil bags of this material has strong air barrier performance, high temperature resistance (121 ℃), low temperature resistance (-50 ℃), oil resistance. The use of aluminum foil bags is different from ordinary bags, mainly for high-temperature cooking and preservation of low-temperature food. However, aluminum foil packaging bag is weak and easy to break due to its material, coupled with poor acid resistance and no heat sealability. So it is generally only used as the middle layer material of the bag, for example, the milk packaging bags we drink in our life, frozen food packaging bags, will use aluminum foil.

2. PET material

PET is also called biaxially oriented polyester film, this material is very transparent bags, glossy, strength and toughness is also better than other materials, but also not easy to break, and non-toxic tasteless, high safety, can be used directly for food packaging. So in daily life PET is a variety of food, medicine, non-toxic sterile packaging materials. However, it also has obvious disadvantages, that is, it is not heat-resistant, not alkali-resistant, and can not be placed in hot water immersion.

3. nylon

Nylon is also called polyamide, the material is also very good transparency, and heat resistance, oil resistance, puncture resistance, touch is also relatively soft, but not resistant to moisture, as well as poor heat sealing. So nylon bags are mostly used for packaging solid food, as well as some meat products and steamed food, such as chicken, duck, ribs and other packaging, can extend the shelf life of food.

4. OPP material

OPP, also known as oriented polypropylene, is the highest transparency in the packaging bag material material, but also the most brittle, the tension is also very small. Most of the transparent packaging bags used in our lives are made of OPP material, its use is very wide, clothing, food, printing, cosmetics, printing, paper and other industries will be used.

5. HDPE material

HDPE full name is high-density polyethylene, the bags made of this material is also called PO bags, its use of a wide range of temperatures, both for frozen food packaging, but also can be applied to resist 100 degrees Celsius boiling treatment of bags. In daily life, its mostly used for food packaging, grocery shopping bags, can also be made into composite film, used for food impermeability and insulation packaging film

6. CPP: this material has good transparency and higher hardness than PE film. And it has many kinds and wide range of uses, which can be used for food overpack, candy overpack, pharmaceutical packaging, etc. It can also be used as a base film for composite materials, and made into composite bags with other films, such as hot-filling, steaming bags, aseptic packaging, etc.

7. PVC plastic packaging bags

It is made of polyvinyl chloride, which has good water resistance and transparency, and can change the tensile strength and tear strength by adjusting the plasticizer measurement, and has good processability, and is widely used in food packaging bags, stationery packaging bags, cosmetic packaging bags, transportation packaging, plastic shopping bags, garbage bags, etc.