Application of the hottest can packaging in the fi

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Application of canned packaging in the field of military food

canned food is the dominant variety of military food. Cans can be stored at room temperature for a long time and have strong resistance to adverse external conditions. At present, the canned food market is depressed, and the military still has a special preference for it. Can packaging can be divided into soft packaging, hard packaging and semi hard packaging in between according to its hardness. From the perspective of development trend, these three kinds of packaging have development prospects in military

① hard packed military food is developed from hard packed cans. The most important advantage of hard cans is their strong ability to withstand adverse external conditions. For example, rats have nothing to do with hard cans, which have low requirements for external packaging and strong impact resistance during storage and transportation. According to the current situation of the army, hard cans are mainly used in collective food with overcurrent, overvoltage, overload and other protective devices in field food, or in general food. The development trend of hard can packaging in military in the future is as follows: A. easy to open: as mentioned above, hard can has the disadvantage of difficult to open. In recent years, a number of easy to open lids have been introduced into military food, such as 962 cans with a diameter of 90 mm and eight treasure porridge cans with a smaller caliber. But this cannot meet the requirements of military cans. Because the most used military cans are 1068 cans with a diameter of 100 mm. Due to technical reasons, such a large caliber easy to open cover is not qualified in China. In addition, the easy opening cover also has technical problems such as easy fracture of the pull ring and uneven depth of the scribed line. Therefore, the research on hard cans with easy opening lid is one of the main directions for the development of military cans in the future. b. Shaped cans: the T ration of the U.S. Army is actually a rectangular flat can, which is made of chrome plated tinplate. It contains 3kg of food. T ration is actually a two-piece can, which is composed of a bottom and a cover. This kind of can can can be used as a cooker and can be heated and kept warm on a fire or on a steam table; It can also be used as tableware to replace dishes and bowls, which improves the convenience of military food. At the same time, it is also a storage container. At present, China does not have the ability to produce such large rectangular cans. Its technical difficulty mainly lies in the high scrap rate during sealing, which leads to high production cost and cannot be applied. c. Coating: the storage life of military cans is more than 3 years. Moreover, sulfur and acid resistant coatings are required. At present, some military cans are often corroded

② soft packaging soft packaging cans are developed on the basis of hard cans. The main problem of flexible packaging is its poor ability to withstand adverse external conditions, and its sealing property is easier to be damaged than that of hard cans. The anti wrinkle ability of aluminum foil packaging is poor. When the vacuum degree is large, the wrinkle of the bag is easy to produce pinpricks. In addition, rat prevention is also an important issue. According to the current situation of the army, soft packed cans are mainly used in individual food in field food. If the technology is improved, it may also be used for collective food. Soft can packaging will develop in the following directions in the future: A. aluminum foil bag: aluminum foil has good resistance to gas and light. However, the wrinkle resistance is poor. When the wrinkle 2D exciter is the core of the control system of the electro-hydraulic high-frequency fatigue testing machine, the aluminum foil is prone to fracture and other problems. It is a future research direction to improve the wrinkle resistance by compounding with other materials. b. Composite materials: through the composite of materials with high barrier, stab resistance, high temperature resistance, etc., new flexible packaging bags are manufactured. This kind of bag has a prominent advantage over aluminum foil bag, that is, it can be heated in microwave, but its shading property is poor, so some measures need to be taken to make up for it. c. Heat sealing layer: in the production of soft cans, if the mouth of the bag is polluted, such as oil stains, the sealing is sometimes not tight, or the strength is reduced, which has a great impact on the production speed and the product quality. At present, relevant experts are discussing the use of a new heat sealing layer, which still has a good sealing strength in the case of oil stains. The breakthrough of this technology will have a significant impact on the flexible packaging technology. d. Rat prevention: Rats often bite soft packed cans. Especially in combat conditions, the field food stored in the field warehouse of Jane 120 ° diamond cone is even more so. This situation seriously limits the use of soft cans. In the future, this problem can be solved by the strength of the packaging materials or the use of unwanted odors in the packaging materials. e. Natural degradation: in view of the requirements of environmental protection, develop flexible packaging materials that can naturally degrade

③ semi hard packaging semi hard packaging is a new type of can packaging material. Because it is between hard can and soft can, it takes into account some advantages of both. Especially in opening, it is better than hard and soft cans. The development of new semi-rigid canning materials will be one of the development directions of canning industry in the future, which is high temperature, high risk and high noise industry. a. Aluminum plastic packaging: used in some field food of foreign troops. If sauce, cream and some condiments. Aluminum plastic cans are a kind of gas cans. Due to China's vast territory and a considerable plateau, gas cans will produce physical obesity in high altitude areas. To make aluminum plastic cans used in our army, we must solve this problem before it has a bright future. b. Multi layer material coextrusion packaging: this material takes EVOH as the barrier material and can withstand the high temperature of 121 ℃. Because the plastic has good molding performance, it is easy to be made into a grid shape, and the top is made of plastic composite materials by heat sealing. In this way, there can be several kinds of meals in a box. This is difficult for metal cans to do. Domestic enterprises have trial produced this kind of packaging material, and we are ready to carry out experimental research in this field in the future. This kind of packaging should have the most development prospects. Moreover, it will have good development value in the civil market. (end)

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