here are many types of packaging bags that can be seen everywhere in daily life, but few people can distinguish them clearly. Today, let's take a look at the several materials of packaging bags and their main uses.

 

1、 Aluminum foil

Aluminum foil material can effectively block air, resist high temperature (121 ℃), low temperature (-50 ℃), and oil. The purpose of aluminum foil bags is different from ordinary packaging bags, mainly used for high-temperature cooking and preservation of low-temperature food. However, aluminum foil packaging bags lack heat sealing due to their fragile and easily broken materials, as well as poor acid resistance. Therefore, it is generally only used as the middle layer material of bags. For example, the facial mask bags and halogen packaging bags commonly used in our life will use aluminum foil.

 

 

2、 PET

PET, also known as biaxially stretched polyester film, has good transparency, strong luster, superior strength and toughness in packaging bags compared to other materials. It is also not easily broken, non-toxic, odorless, and has high safety. It can be directly used for food packaging. So in daily life, PET is a non-toxic and sterile packaging material for various foods, drugs, and other products. However, its drawbacks are also obvious, that is, it is not heat-resistant, not alkali resistant, and cannot be soaked in hot water.

 

 

3、 Nylon

Nylon, also known as polyamide, has good transparency, heat resistance, oil resistance, puncture resistance, and is relatively soft to the touch. However, it is not moisture resistant and has poor heat sealing properties. So nylon packaging bags are mostly used for packaging solid foods, as well as some meat products and steamed foods, such as chicken, duck, ribs, etc., which can extend the shelf life of food.

 

 

4、 OPP

OPP, also known as oriented polypropylene, is the most transparent and brittle material in packaging bags, with minimal tensile force. Most of the transparent packaging bags we use in our daily lives are made of OPP materials, which are widely used in industries such as clothing, food, printing, cosmetics, printing, and paper.

 

 

5、 HDPE

The full name of HDPE is high-density polyethylene, and bags made of this material, also known as PO bags, have a wide temperature range and can be used for both frozen food packaging and packaging bags that can withstand boiling treatment at 100 degrees Celsius. In daily life, it is often used for food packaging, grocery shopping bags, and can also be made into composite films for anti permeability and thermal insulation packaging of food.

 

 

6、 CPP

This material has good transparency and higher hardness than PE film. And it has many types and a wide range of uses, which can be used for food packaging, candy packaging, drug packaging, and so on. It can also be used as a base film for composite materials, combined with other films to form composite bags, such as hot filling, steaming bags, sterile packaging, etc.

 

7、 PVC

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The seven materials introduced above are some commonly used materials for packaging bags. The characteristics of each material are different, and the performance and application scenarios of the packaging bags made from them are also different. We need to choose according to our own actual situation.