What are the outer materials of food packaging bags?
Release time:
2024-01-08
The outer material of food packaging bags usually needs to have good protective performance, printing effect and aesthetics to ensure the safety of food and attract the attention of consumers. So what are the common outer materials?
1. Polypropylene (PP):
- Advantages: Polypropylene has excellent mechanical properties and heat resistance, and can withstand higher temperatures without deformation. It has good chemical stability and is not easily eroded by chemical substances, thus ensuring the safety of food. In addition, polypropylene has good printability, can perform high-quality printing, and increase the aesthetics of packaging.
- Application: Polypropylene is widely used in food packaging, such as fast food boxes, microwave lunch boxes, etc., because it can withstand high temperature heating without deformation, but also can be used for juice, sauce and other liquid food packaging, because it has good Sealing and barrier properties.
2. Polyethylene (PE):
- Advantages: Polyethylene has good flexibility and sealing, which can effectively protect food from external pollution. It has good heat sealing performance and can achieve tight sealing to prevent food leakage. The chemical stability of polyethylene is good, and it is not easy to be damaged by chemical substances, which ensures the safety of food.
- Application: Polyethylene is often used in food packaging film, cling film, etc., because it can effectively block oxygen and moisture, and extend the shelf life of food. At the same time, polyethylene is also used to make the inner and outer layers of food packaging bags to provide good protection.
3. Biaxially oriented polypropylene (BOPP):
- Advantages: Biaxially oriented polypropylene has high strength and stiffness, and can maintain the shape of the package and is not easily deformed. Its high gloss, can enhance the beauty of the packaging. In addition, BOPP has good printability and can carry out exquisite printing designs to attract consumers' attention.
- Application: BOPP is often used in the outer layer of food packaging bags, such as snacks, candies and other small food packaging, because it can maintain the shape and aesthetics of the packaging. At the same time, BOPP is also used for food labels and stickers, because it can withstand certain friction and tearing, and is not easy to damage.
4. Aluminum foil (Al):
- Advantages: Aluminum foil has excellent barrier properties, which can effectively prevent the penetration of oxygen, moisture and light, and extend the shelf life of food. It has good heat sealing performance, which can achieve tight sealing and prevent food leakage. Aluminum foil has good high temperature resistance and can withstand high temperature heating or refrigeration without damage.
- Application: Aluminum foil is often used in food packaging, such as chocolate, biscuits, etc., because it can prevent food from moisture and oxidation. Aluminum foil is also used in pharmaceutical packaging because it can effectively block the invasion of bacteria and pollutants.
5. Polyester (PET):
- Advantages: Polyester has excellent barrier properties, which can effectively prevent the penetration of oxygen and ultraviolet rays, and protect the freshness and color of food. It has good heat resistance and can withstand high temperature heating or refrigeration without deformation. Polyester has good printability, can carry out high-quality printing, and increase the beauty of packaging.
- Application: Polyester is often used in the manufacture of beverage bottles because it can effectively protect the beverage from light and oxygen. Polyester is also used in the manufacture of food packaging bags, such as salad dressings, seasonings, etc., because it can provide good barrier properties and extend the shelf life of food.
6. Nylon (PA):
- Advantages: Nylon has excellent wear resistance and stretch resistance, and can withstand certain pressure and friction without damage. It has good flexibility and can keep the shape of the packaging bag during filling and transportation. Nylon has good barrier properties and can effectively prevent the penetration of oxygen and grease.
- Application: Nylon is often used in the manufacture of food packaging bags, such as meat, vegetables, etc., because it can provide good protection to prevent food from being contaminated and damaged by the outside world. Nylon is also used in the manufacture of food packaging film, because it can effectively block oxygen and oil, and extend the shelf life of food.
7. Adhesives and coating materials:
- Advantages: Adhesives and coating materials can be used to bond different layers of materials and enhance the overall performance of the package. They can improve the barrier properties, strength and flexibility of the packaging, making the packaging stronger and more durable. In addition, adhesives and coating materials can also improve the printing effect of packaging and increase the aesthetics of packaging.
- Application: Adhesives and coating materials are often used in the manufacture of composite packaging materials, such as polyethylene and polypropylene, to enhance the protective properties and printing effect of packaging. They can also be used to make food packaging bags at the seal, to ensure that the seal is tight and strong.
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