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Research on military food packaging (III)

III. Development Trend of military food packaging 1. canned packaging 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 army still has a special preference for it. Can packaging can be divided into soft packaging, hard packaging and intermediate semi-hard packaging according to its hardness. From the perspective of development trend, these three kinds of packaging have development prospects in military

① hard packaging

military food is developed from hard packaging cans. The most important advantage of hard can is its strong ability to withstand adverse external conditions. For example, rats have nothing to do with hard cans. Hard cans have low requirements for external packaging and strong impact resistance during storage and transportation

hard cans are mainly used in collective food of field food or general food according to the current situation of the army. The military development trend of hard can packaging in the future is as follows:

a. easy to open lid: 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 90mm and Babao porridge cans with a smaller caliber. But this can not meet the requirements of military cans. Because the most commonly 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, study of the hard cans with the easy open lid is one of the main directions for development of the military cans in future

b. shaped cans: the T ration of the U.S. Army is actually a rectangular flat can made of chrome plated tinplate. It contains 3kg food. T ration is actually a two-piece can, which consists of a bottom and a cover. The can can not only be used as a cooker, but also 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. 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 rejection rate during sealing, which leads to high production cost and can not be applied

c. coating: the preservation period of military cans is more than 3 years. Moreover, sulfur and acid resistant coatings are required. At present, some military cans are often rusted

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 needle holes. In addition, rat prevention is also an important issue

according to the current situation of the army, the soft packed cans are mainly used in the field food and the individual food. If the technology is improved, it may also be used for collective food. In the future, flexible can packaging will develop in the following directions:

a. aluminum foil bag: aluminum foil has good resistance to gas and light. But the anti wrinkle ability is poor. In the case of wrinkle, the aluminum foil is easy to break. It is a future research direction to improve the wrinkle resistance of software by compounding with other materials

b. composite materials: new flexible packaging bags are manufactured through the composite of materials with high resistance, stab resistance and high temperature resistance. 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 bag mouth is polluted, such as oil stains, the sealing can not be tight or the strength is reduced, this problem has a great impact on the production speed and the product quality.

at present, relevant experts are discussing the use of 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. This is especially true for field food stored in simple field warehouses under operational conditions. This situation severely limits the use of soft cans. In the future, this problem will 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 - hard canning materials will be one of the development directions of military canning in the future

a. aluminum plastic packaging: used in some field food of foreign troops. If sauce, cream and some condiments. Aluminum plastic can is a kind of air can. Because China has a vast region and a large plateau, air can will produce physical fat in high altitude areas. In order to use aluminum plastic cans in our army, this problem must be solved before it has a bright future

b. multi layer material coextrusion packaging: this material uses EVOH as the barrier material and can withstand the high temperature of 1 string at 721 ℃. 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. Domestic enterprises have trial produced this kind of packaging material. 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

2. dry product packaging

dry products are resistant to storage at room temperature, so many military foods use this form. The dry products of our army are packed with a wide range of materials, such as tinplate, aluminum foil and composite packaging materials

① oxygen isolated packaging

most military dried foods contain oil, some of which are relatively high, such as compressed dry food. The key factor affecting the storage life of this kind of food is fat oxidation. Therefore, such products must be packaged with good oxygen barrier performance. According to the current development of packaging, tinplate cans, aluminum foil packaging bags and multi-layer composite bags will be widely used in military food. It is particularly pointed out that some dried products, such as dehydrated rice, have very low oil content, but they are also very easy to produce Khara flavor. The packaging requirements for this product are the same as those for high-fat products

② waterproof and steam packaging

some dried products have good storage performance. China and Malaysia have a good relationship, such as dehydrated noodles. This product can be stored for a long time as it prevents absorption of moisture. Therefore, the packaging materials used for such products are relatively simple and cheap

3. edible packaging

some advanced foreign armies are studying edible packaging. This kind of packaging is commonly used in inner packaging. On the one hand, it can reduce the volume and quality occupied by the packaging and increase the edible part of the whole set of food. On the other hand, it can improve the convenience of use and reduce food pollution, slag, etc. At present, there is little research on edible packaging in our army, but it will be a research content with great development prospects

4. combined packaging

military food is usually composed of a variety of products. Such as canned food, compressed dry food, seasoning, etc. The packaging used when these products are combined into meal food or daily food according to certain nutritional components is called combined packaging. According to different use occasions, the materials used for combined packaging are different. At present, the materials used for combined packaging include cartons, composite bags, plastic boxes, tinplate, etc. On the premise of providing protective performance, the most important principle of these materials is to reduce weight and price

5. protective packaging

the requirements of modern war on military food are constantly improving. Because of the rapidity and mobility of operations, it is required that military food can withstand air drop and parachute drop, can float on the water, and can prevent damage and pollution caused by the explosion of various nuclear weapons. At present, foamed plastics and glass wool used as protective packaging

and avoid scratching when washing the car. These two materials can not only float on the water, but also better buffer the impact generated by air drop. The research in this area needs to be further strengthened

6. thermal insulation packaging in order to improve the sensory acceptability of military food, the army has developed a self heating flameless heater. The heater can heat the central temperature of canned food to about 60 ℃. In order to effectively improve the efficiency of the heating sheet, prevent heat loss, and prevent skin scalding due to excessive temperature, it is necessary to use thermal insulation materials. This kind of packing material requires small volume and good heat insulation effect

7. outer packaging

the outer packaging of military food now adopts cartons. It is expected that in the future, it may be combined with protective packaging to produce cardboard and plastic composite outer packaging

in general, military food packaging will develop towards lightweight, reliable, functional and biodegradable

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