Traditional canned meat products are packaged in metal containers (metal cans). Metal cans have unique advantages as a package for canned food. However, the overall cost of metal packaging is high, and the consumption of such foods is growing rapidly. It is especially important to seek new packaging materials. In recent years, some new forms of canned meat cans, such as soft cans, have made the consumption process more convenient and more attractive to consumers, which has greatly expanded the development of canned foods for the meat processing industry. The development offers new opportunities.
Requirements for packaging materials and containers from canned meat
Its packaging materials and containers must be selected to meet the requirements of general food packaging. At the same time, due to the special nature of canned foods (ie, having a long shelf life, maintaining the original color, aroma, taste and other characteristics of the meat products, and being convenient to eat), the packaging materials and containers have some special requirements.
1. The material and the container itself are non-toxic, odorless, and do not produce harmful substances after contact with the contents;
2. It has good barrier performance and sealing performance, prevents oxygen from infiltrating and causes oxidation, and has adverse effects on meat products;
3. The moisture permeability of the material is extremely small, avoiding the exchange of the moisture of the meat product with the external environment and affecting its quality;
4. It can block the transmission of light and avoid the requirement of maintaining the quality and flavor of meat products;
5. It has good corrosion resistance, ensuring that the seasoning soup in the canned meat does not react with it or produces harmful substances;
6. Have certain mechanical strength, good strength, oral packaging operation and processing characteristics, printing adaptability and other characteristics to meet the needs of industrial production and packaging and decoration printing needs.
Adaptability of flexible packaging materials for canned food packaging
Flexible packaging refers to "packages made of flexible materials (such as paper; sheets of plastic, sheets of plastic, aluminum foil, and metallized films), and flexible packaging materials are usually laminated roll materials that conform to the shape of the contents. A large number of single-layer materials can be regarded as flexible packaging materials, each type of single-layer materials have their limitations, such as heat sealability, printing adaptability, flexibility, retortability, etc.; if used for product packaging, must also be with the product Adaptation, such as barrier properties (blocking water vapor, oxygen), light protection, resistance to cracking cracking, odor of the material itself, toxicity, etc. must be compatible with the packaged product. Therefore, soft packaging materials used in canned food packaging often use multi-layer composite materials to take advantage of the single-layer materials in the composite materials to meet the special requirements of various aspects of packaging materials for meat canned foods.
In summary, the materials used for the packaging of canned food must meet the requirements of both soft packaging materials and soft materials for cooking and packaging. Generally, they should be two layers of different natures that can make up for each other and give full play to their respective advantages. Or multilayer materials (including plastic materials, aluminized materials and aluminum foil materials, etc.). In general, such packaging materials require a hot water or steam sterilization process at a temperature of 110-140 ° C, requiring materials with good heat sealing properties, heat resistance and high barrier properties, while also meeting mechanical processing properties and decoration. Requirements for decorating performance (printability).
Application of flexible packaging materials in canned food packaging
At present, the flexible packaging material commonly used for the packaging of canned foods is retort pouch packaging. There are mainly é«¡ç³èŸ î… é«¡ç³èŸ î… î…Žç³èŸ îŒ î…Žç³èŸ îŒ î…Žç³èŸ îŒ å¸§ 帧 帧 帧 帧 帧 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 The above-mentioned high-temperature sterilization to achieve commercial sterility, can be stored in the packaged food for a long time at room temperature. The packaging material is a composite material composed of two, three or more layers of different substrates, and has recently emerged as a new packaging form in food cans, especially in meat canned food packaging.
The use of a retort pouch as a package for canned meat products has the following advantages over conventional metal cans:
1. The packaging materials and containers are light in weight, comprehensive packaging cost, convenient to carry and store, and easy to open when sealing and eating;
2. Because the composite flexible packaging material used in soft cans has small thickness and fast heat transfer, the sterilization and cooking time is shorter than that of the same capacity metal can, so that the food can be prevented from overcooking, thereby reducing nutrient loss and maintaining the original flavor. And can save energy;
3. Soft cans have a long shelf life (up to 12 months at normal temperature), and some soft cans do not need to be refrigerated during storage, transportation and sale;
4. When it is eaten, it can be heated and re-cooked with packaging to prevent the loss of flavor to the utmost extent;
5. It can effectively save transportation cost and storage space, and can reduce production cost and increase product competitiveness to a certain extent.
6. The side effects and effects between the inner food and the packaging container are less than that of the metal can, and no pollution such as metallic taste is generated;
Soft cans also have obvious shortcomings, such as the low strength of the packaging container, which is easy to be puncture; the shelf life is not as long as metal cans and glass cans; the production capacity is lower. At present, soft cans still do not dominate the meat canned market in China, but they have good development prospects.
With the development of retort pouch packaging and related technologies, high-temperature cooking packaging containers have appeared in other forms of packaging containers, such as co-extruded composite multi-layer sheet structure packaging containers, in addition to the bag form. The container is different from the multi-layer film structure of the general retort pouch material, and the composite plastic sheet produced by the multi-layer coextrusion method is subjected to vacuum blister thermoforming or pressure thermoforming to form various forms of packaging containers. The container can be sterilized by a microwave oven and a resistance furnace, and the structural form changes a lot, such as a cup shape, a tray, a bottle shape, a tube shape, and the like.
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