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The specific requirements of food packaging for composite packaging bags

by:Supouches Packaging     2021-12-20
1. Specific requirements for food packaging bags. Since food packaging bags are the most important objects of use for composite packaging bags, there are many types and different requirements. The contents of the packaging vary from raw to cooked, from low temperature to high Hard nuts, from vacuum packaging bags to inflatable packaging bags, cover almost all the scope of composite packaging bags. (1) Barrier requirements. Most foods are rich in fats, which are easy to oxidize and deteriorate, so they have strict requirements on oxygen barrier properties. The requirements for the increase or decrease of moisture in the packaging bag are also very high. (2) Water activity. Food contains a certain amount of moisture. When the packaging material is selected, the moisture content of the food changes little under the condition that the processing conditions and formula of the food remain unchanged. When the conditions change, it will directly affect the original water activity value of the food, and moisture is one of the important factors that cause food deterioration. As long as there is a certain moisture content, microorganisms can grow. For foods with different moisture content, different materials and methods should be used. a Foods with low moisture activity. Bacteria cannot survive in foods with water activity lower than 0.65. For dry foods with water activity lower than 0.60, as long as they can be kept dry for a long time, the spoilage caused by bacteria in the food can be avoided. b Foods with moderate water activity. For intermediate moisture foods with a water activity of 0.60-0.90, methods to maintain food quality include vacuum packaging, nitrogen packaging, and deoxidizer packaging, such as oxidative deterioration of fat in the food, and discoloration of food. c Foods with high moisture activity. For multi-moisture foods with a water activity of 0.9-1.0, the quality maintenance method: heat sterilization above 100 ℃, use hydrogen peroxide, radiation and other sterilized aseptic packaging. (3) The role of inflatable packaging of food bags. The function of inflatable packaging is to extend the shelf life, and the type of inflation puts forward different requirements on the packaging bag (4) Requirements for grain packaging bags. Singing and dancing have a respiration effect, and the adsorption capacity of different grains for oxygen varies greatly. In various grain packaging bags, the method of filling oxygen into the packaging bags with excellent barrier properties can be used to better preserve the inflatable packaging bags of food. (5) High temperature sterilization requirements. Food sterilization includes 85°C pasteurization, 100°C boiling sterilization, 121°C high temperature steaming sterilization, and 135°C ultra-high temperature steaming sterilization. Choose sterilization conditions according to different products. Different foods have different factors that cause spoilage. It is necessary to understand the main factors of various food spoilage in advance, and design the packaging bags in a targeted manner.
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