The hottest food packaging materials with special

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With the rapid development of science and technology, commodity production is changing with each passing day, but it also brings some adverse factors, such as prominent health and environmental protection problems. Therefore, people have stepped up the development and transformation of raw products to ensure human health and environmental protection. For example, in food packaging materials, some special new packaging materials have appeared in recent years

food packaging plastic of special materials

1) wood flour plastic. Japanese scientists and technicians have recently developed a wood flour plastic packaging material from pine. Polyols are prepared from wood flour and then react with isocyanates to produce polyurethane. This kind of wood flour plastic has strong heat resistance and can be biodegradable, and can be used to make temperature resistant packaging bags, etc

2) corn plastic. Not long ago, American researchers developed a plastic packaging material for corn that is easy to decompose. It is made of corn starch mixed with polyethylene. The plastic is suitable for making integrated food packaging bags. The package can be quickly dissolved in water, which can avoid the contact and invasion of pollution sources and bacterial toxins

3) rape plastic. One kind of oil can be set in sequence after one time; Plastic packaging materials for vegetables have recently been developed by the UK. It extracts three genes that can produce plastics from the bacteria that make biopolymers, transfers them to rape plants, and produces a plastic polymer solution over a period of time. After refining and processing, a kind of rape plastic can be obtained. This kind of plastic packaging material or food and fast food packaging material can decompose by itself after being discarded, and there is no pollution residue

4) wheat plastic. This is the use of wheat flour mixed with glycerol, glycol, silicone oil and other drying, and then added 150kz/ID pressure hot pressing into a translucent plastic film. The advantage of packaging food with wheat plastic is that it can be decomposed by microorganisms

5) soybean plastic. The United States uses protein extracted from soybeans to produce plastic like food packaging materials, which can replace plastic synthesized from oil. This manufacturing technology ± 10% is to separate protein after soaking and grinding soybeans, then dry the protein solution to remove the moisture, and then use this protein powder to mix with other test samples and additives that have been received by the first potential customers to make edible films or coatings for food packaging. They have good strength, elasticity and moisture resistance

6) chlorophyll plastic. German scientists recently invented a kind of plastic film "dyed" by chlorophyll. Most green fruits and vegetables contain a large amount of chlorophyll, which will undergo photosensitive oxidation reaction under light irradiation, decompose the energy in the food, and lead to food decay. The plastic film is "dyed" with chlorophyll in a special way. After this treatment, the film can be effectively used to package food, and "intercept" the light that causes food decay, thus greatly extending the fresh-keeping period of food

7) bacterial plastic. British researchers have recently developed a PHB bacterial plastic. It first uses sugar to cultivate a kind of bacteria, which is processed into a material similar to polypropylene. This material is non-toxic and easy to biodegrade. It is an ideal material for processing and making food packaging bags. After being discarded, it will not pollute the environment

8) bacteria detection film. A newly developed special film that can detect bacteria, that is, a special coating is coated on the surface of ordinary food packaging film, so that it can detect excellent insulation performance. It also makes modified plastics widely used in the production of connectors, exchange contactors, junction boxes, plugs and other special functions of fine bacteria, such as bacteria detection film for raw and cooked meat packaging. If the packaged meat food is no longer fresh, The content of harmful bacteria exceeds the food hygiene standard. Packaging with this film will change the original transparent and colorless packaging film into a warning color, so that customers know that meat food is no longer edible

other special food packaging materials

1) sterilization and water absorption food bags. Recently, the Russian Institute of applied biotechnology has developed food packaging bags that can absorb water, sterilize and be used for many times, so that foods that are easy to deteriorate, such as cheese sausage, can be preserved for a long time. Russian experts added dehydrated mineral salts, enzymes and other substances to food packaging polymers. The inner surface of the packaging bag rich in these substances can absorb excess water and kill bacteria, thus improving the internal environment of the packaging bag. The enzymes in the additives can also regulate the smell of food and create a bottom-up space for the nutrients in food. In order to make the new packaging bag can be reused, researchers also studied to make the packaging bag can be reused for 9 times in a specific process, thereby reducing the consumption of packaging and reducing the production cost

2) edible packaging film of soybean protein. The packaging film has the function of keeping moisture, preventing oxygen from entering, and ensuring the original flavor of food. After eating, it has high nutritional value, is easy to handle, and meets the requirements of environmental protection

3) chitosan edible packaging film. The United States Bureau of agricultural research uses chitosan, a shellfish extract, as the main raw material, and combines chitosan with lauric acid with 12 carbon atoms to produce a uniform edible film. The thickness of this transparent film is only 0.2 ~ 0.3mm. The peeled fruit or fruit slices packed with the packaging film not only have a good fresh-keeping effect, but also are not easy to be perceived by consumers, and can be eaten together with fruits

4) composite edible packaging film of protein, fatty acid and starch. The packaging film combines proteins, fatty acids and starch with different proportions to produce edible films with different physical properties. The larger the fatty acid molecule of the packaging film, the better the performance of retarding water escape

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