Mylar bag has many different types of functions, one of which is high temperature resistance, and this high temperature resistant flexible packaging is called a high temperature retort bag. The definition of high-temperature retort bag is that after the food is sterilized at high temperature (121°C-135°C) in the flexible packaging bag, it not only increases the shelf life of the food, but also retains the original flavor of the food, so that consumers can enjoy the packaging bag at any time during the shelf life. food inside. Next, Let’s learn more about what is a high temperature cooking bag.
A.Advantages of high temperature cooking bag
1. Maintain the original flavor of food
The cooking bag is thinner, which can achieve the sterilization effect in a short time at high temperature and keep the original taste of the food.
2. Easy to use packaging
When eating, heating the food only needs to place the cooking bag in hot water or a microwave oven to be eaten, which is convenient for consumers.
3. Can save energy during high temperature sterilization
Because the retort pouch is thinner than iron cans, it can be heated to the sterilization temperature in a short time, and the total energy consumption is 30-40% less than that of iron cans.
4. Ease of sale to consumers
Retort pouches can be packaged differently according to the type of food, and the outer layer can be printed in color. In addition, the packaging is light, which is easy to attract consumers to buy products.
5. Food storage time is long
Due to the high-temperature sterilization process, the shelf life of the food is extended, and there is no need to refrigerate or freeze the food in the retort bag.
B. Classification of high temperature cooking bags
Retort bags can be divided into transparent retort bags and aluminum foil bags (opaque barrier bags), and transparent retort bags can be divided into transparent barrier bags and transparent non-barrier bags. Transparent barrier bags are generally divided into a three-layer structure, such as the mutual bonding of PET, BOPA and CPP, or the three-layer structure of PET, PET and CPP. This kind of laminated material generally has a temperature resistance below 135°C, and is usually used for the packaging of sauces or meat products. In addition to the bonding of the three materials, there is also a method of coating a layer of polyvinylidene chloride on the surface of PET or NY. The heat-resistant temperature is below 121°C, and it has good gas and moisture barrier properties. As for the transparent non-barrier bag, it is generally a double-layer structure, such as PET (BOPA) and CPP laminated. The temperature resistance is below 135°C, and it is usually used in ordinary food packaging such as dried beans.
C. Common materials for high temperature cooking bags
1. PET (polyester)
Good printing performance, high mechanical strength and rigidity, good moisture resistance, gas barrier, heat resistance, cold resistance and other properties, the disadvantage is poor puncture resistance.
2. AL (aluminum foil)
Because of its superior gas barrier and moisture resistance, it has the advantage of preserving the taste of food. The protection is very strong, so that the packaging is not easy to be damaged by bacteria and mold.
3. BOPA (Nylon or NY)
It has high barrier properties to common gases and odors, excellent puncture resistance and abrasion resistance, and has an extremely wide operating temperature range (-60°C-150°C). The disadvantage is that the anti-moisture absorption ability is poor, once it is damp, its barrier performance will be greatly reduced.
4. CPP (Polypropylene)
Because it is used as the inner layer material for cooking, the requirements for this material are extremely high, and it must reach the level of high-temperature cooking type. It is required to have good flatness, good tensile strength, heat sealing strength and impact resistance, and the only disadvantage is that it is not resistant to freezing.
In the evolution of food packaging, from rigid cans to flexible packaging, it provides a lot of convenience to people. High-temperature retort bags have many advantages, including portability or long shelf life. The high-temperature retort pouch adhesive provided by Coating Precision has good chemical resistance and heat resistance, and can be used for lamination of printed aluminum foil for boiling sterilization packaging. For more product information, please contact us.
