Vacuum bag Also known as decompression packaging, the air in the packaging container is all drawn out and sealed to maintain a high degree of decompression in the bag. The lack of air is equivalent to the effect of hypoxia, so that the microorganisms have no living conditions to achieve freshness and no rot in the packaging. the goal of.
At present, the processing and preservation of food, oilseeds, fruits, vegetables, poultry, and aquatic products are still in a low-level and extensive state. The packaging level reflects the scientific and technological level and affluence of a country to a certain level. According to conservative estimates, the post-harvest losses of horticultural crops can almost meet the basic nutritional requirements of 200 million people. Although there are some chemical preservation methods, there are some concerns about the safety of chemical preservation agents, so physical, pollution-free modified atmosphere preservation methods have become a research hotspot. Vacuum bags can be seen from this, the development and popularization of storage and preservation technology are increasingly valued by producers, operators and consumers.
Vacuum bag The main function is to remove oxygen to help prevent food spoilage, and its principle is relatively simple, because food spoilage is mainly caused by the activities of microorganisms, and most microorganisms (such as mold and yeast) need oxygen for their survival. Vacuum packaging uses this principle to evacuate the oxygen in the packaging bag and food cells, so that the microscopic objects lose the "survival environment".
The characteristics of vacuum packaging bags : moisture-proof, anti-static, explosion-proof, anti-corrosion, heat insulation, UV blocking, low cost, small volume ratio, no pollution, high barrier and other effects.
Now many food manufacturers color design the vacuum bags they use according to their own food characteristics. People's emotions about color will change with the continuation of time and changes in aesthetic trends, so how to grasp the trend of popular colors, design a food appearance that meets the requirements of the times, and strengthen the appeal of the color of food vacuum packaging bags. To maximize the language function of the color of food vacuum packaging bags is believed to be an important factor that every food company has to consider. For example, some ethnic minorities living in the Loess Plateau and Yunnan-Guizhou Plateau, or people in distant mountain areas like some bright colors such as red and green. The color of the vacuum bag has the objective restrictions of nationality, region, customs and abstinence. This blends with the background of the prairie mountains he lives in, while the bright colors show the vigorous vitality and love for life. Most ordinary rural residents prefer light, fresh and bright colors.
The vacuum bag is damaged during transportation, which is also a problem that companies have to pay attention to. The damage of the vacuum bag is mainly due to the following reasons:
1. Design of food vacuum packaging. If the net content or volume of the content exceeds the tolerance range of the flexible packaging material used, there will be problems of bag breakage and cracking when a slight external force is applied during transportation or sales and circulation. It is generally used as a heat sealing layer for vacuum packaging bags, and the material thickness should not be less than 50μm thick.
2. The quality of food vacuum packaging materials. The quality problems of packaging materials lead to sealing cracking problems in the finished packaging, which are generally concentrated in the following aspects:
â‘ Physical and mechanical properties of food packaging -such as tensile strength and elongation at break, puncture resistance, pendulum impact resistance, peel strength, etc., can comprehensively judge the toughness, puncture resistance and impact resistance of the packaging bag Whether the physical and mechanical properties meet the requirements of packaging, storage stacking and transportation. (Related to the content, the size of the packaging bag, the transportation route and the packaging form)
â‘¡Tightness of food packaging -such as burst pressure test, you can determine the location of the broken bag and the location of weak mechanical strength. For example, the heat seal strength test can determine whether the heat seal strength meets the requirements of the food content, and determine the location of the poor heat seal and the uniformity of the heat seal effect. For example, the damage of chicken claw vacuum packaging is because when the chicken claw is cut, the bones of some broken claws are sharply cut, and when boiled, the skin shrinks, so the bones are exposed, which is easy during transportation. Pierce the bag. Therefore, the puncture resistance of the packaging bag should be considered as the focus of the packaging material combination.
The leak and seal strength tester can not only detect the maximum bursting force of the flexible packaging bag, but also test the bursting time of the packaging bag by setting the applied pressure. The stacking structure can be designed according to the test data to further adjust the parameters of the heat sealability process to Improve the packaging effect, or analyze the problems in the packaging structure according to the location of the rupture of the flexible packaging bag.
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