Application of the hottest edible packaging

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With the development of science and technology and the improvement of people's living standards, people pay more and more attention to environmental issues, and have increasingly strict requirements on the quality of goods, especially food, packaging and the disposal of waste packaging. In this case, "edible packaging" came into being

edible packaging is a promising green packaging. Edible packaging refers to the packaging of food and drugs with edible packaging materials through a specific packaging process to achieve the intended protection purpose, and can be eaten with these food and drugs, which is harmless or even beneficial to human body, and will not produce waste to the environment. There are two forms of edible packaging: edible film and edible coating. Edible film is processed to package food, while edible coating is directly dried on food with food as carrier. Edible film or coating as a component of food and packaging has many advantages, but it must meet some conditions

this kind of material should have taste, be easy to dissolve and disperse in the mouth or disperse in water and oil during processing. They can be used to cover food or to separate different components in food

some functions of edible films and coatings are the same as those of non edible packaging films. For example, the function of blocking water, gas and solute, and its importance lies in the initial corruption model according to the type of food (Physiological Chemistry), which is suitable for some special application requirements. For example, an edible film has high barrier to oxygen and can be used for food oxidation prevention; Another edible film has selectivity for the permeation of oxygen and carbon dioxide, and can be used as the coating of fresh fruits and vegetables. If edible film can partially or completely replace controlled atmosphere storage and control the breathing rate of fresh fruits and vegetables, low-cost edible packaging will be adopted by the whole system. Edible films and coatings widely used require high water barrier. In fact, controlling the water activity of food (not a single food component or a mixture of components) can achieve microbial and physiological and chemical stability as well as sensory performance of food. If the food surface is coated with an edible coating (such as wax) with high moisture resistance, it can reduce the water vapor exchange between food and the environment. The components of non single food or mixed food contain different water activities (such as pizza, cakes with fruit blocks, cereal breakfast foods with dry fruits, etc.). The water exchange between the reduced components can obviously maintain the brittleness and soft tissue of some components. Although some commonly used hygroscopic agents can reduce water activity, their application is limited by certain regulations and flavors. Among some food components with different water activity, the only way to prevent water penetration is to use an edible barrier layer (such as a thin layer of fat) around the components of food components or mixtures. Edible packaging materials are widely used because of their characteristics

at least one ingredient of edible packaging materials can form a fully continuous and cohesive matrix, which is usually composed of polymers or mixtures, forming a continuous crystalline or amorphous structure (hydrophilic polymers, fats, sugars), while the mechanical properties of materials are related to the force between materials molecules and the adhesion between coating and carrier (food) structure. The degree of condensation between molecules of materials is a standard to measure the barrier and mechanical properties of films. The degree of condensation depends on the chemical structure of the film material. The existence of plasticizers and cross-linking agents, the properties and dilution of solvents, application methods, the process of removing solvents, and the thickness of films. By reducing flexibility, voids, and the permeability of gases and solutes, obvious high condensation structures can be obtained, while ordered long molecular chain polymers precipitate in the form of crystals to obtain the highest condensation. These prepared foods are dried by spray, coating, sizing film, impregnation and other methods, and then drained, centrifuged or fluidized drying, and continue to grow from small to large or from large to small, but the liquid edible film is adhered to the food to form. Some edible films, such as alginate based films, need to be treated with crosslinking agents in the second stage to promote the formation of films. The draining method should be carried out when heating to reduce the viscosity, and then through vibrating screen or centrifugal or forced ventilation drying, the coating can be fixed by cooling or drying methods. The film forming without food as the carrier adopts the general technology of non edible film forming, such as extrusion, molding or rolling. Edible film is very sensitive to the physical conditions of environmental medium, temperature and relative humidity. Because edible materials have some deficiencies compared with non edible materials, some additives and plasticizers are usually added in the formation process of edible materials to improve the mechanical, anti-corrosion, sensory and nutritional properties, so as to achieve better results

the raw materials of edible packaging materials mainly include starch, protein, plant fiber and other natural substances. Among the edible packaging materials based on corn, wheat, potatoes, beans, potatoes and other crops, the edible packaging materials modified with corn starch are the most typical. According to the different methods of additives, acid-base treatment, enzyme treatment or oxidation treatment, they can be made into films, extruded into film clothes for small food, and can also be made into drink cups and fast food boxes that are both waterproof and oil-proof. There are animals and plants using protein as raw materials. Animal protein is derived from animal skin, bone, cartilage tissue, etc. this kind of edible material has very good strength, water resistance and oxygen permeability, especially suitable for the packaging of meat food. The plant protein extracted from soybeans can be processed into film for packaging, which has good moisture-proof and oxygen barrier capabilities, and has certain antibacterial properties. It is suitable for the packaging of fatty foods, which can not only extend the shelf life. And it can maintain the original flavor of oily food. Edible packaging materials of plant fibers are mainly made of agricultural and sideline products such as wheat bran, soybean dregs, seaweed, seaweed and other marine plants, which will seriously damage the accuracy of hydraulic valves and oil cylinders. Although these materials have low nutritional value, they are mostly used for weight loss and health care. Plant fiber can be made into various containers and eaten together with food after hot cooking; Or when it is used for packaging instant noodle seasoning, it will dissolve in water without opening it; It can also be made into fresh-keeping packaging paper for fruits and vegetables. The edible material with sodium alginate as the main component has impermeability to fat and vegetable oil, and is a good material for oil resistant packaging. At present, sugar coating, starch based film or coating, protein based film, wax, fat and its derivatives film or coating, composite edible film or coating, chocolate and coating similar to chocolate are mainly used

the number of enterprises and the rapid growth of employees edible film or coating is a very effective method in improving the quality, stability and cleanliness of food. After the completion of the edible two mode experiments, it is judged according to the standard that the operation requirements of the battery fire-free packaging limit its application. It must be selected and used according to the nature of food and the initial test conditions, and its development is related to the characteristics of food and the application technology and ingredients of industrial production, There will be good development in this regard

information source: packaging and printing

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