Performance-specific food packaging materials

With the rapid development of science and technology, commodity production is changing with each passing day, but it also brings some unfavorable factors, more prominent health and environmental protection issues. Therefore, people have stepped up the development and transformation of the original product to ensure human health and environmental protection concepts. For example, in food packaging materials, there have been some special new packaging materials in recent years.

Special materials for food packaging plastics 1)
Wood flour plastic. Japanese scientists recently researched and developed a wood-foil plastic packaging material from pine wood to produce polyurethane by removing polyhydric alcohol from wood flour and reacting with isocyanate. This wood powdered plastic is extremely heat resistant and can be biodegraded and can be used to make temperature-resistant packaging bags.

2)
Corn plastic. Not long ago, American researchers developed a corn plastic packaging material that was easily decomposed. It is made by mixing cornstarch with polyethylene. The plastic is suitable for the production of food packaging integrated bags. The package can be quickly dissolved in water, which can avoid contact with contamination sources and bacteria.

3)
Rape plastics. A rapeseed plastic packaging material was recently developed by the United Kingdom. It extracts three genes that produce plastics from bacteria that make biopolymers and transfers them to oilseed rape plants. After a period of time, a plastic polymer liquid is produced, and a rapeseed plastic can be obtained by refining and processing. The packaging material or snack food packaging material made of this plastic can be decomposed on its own after being discarded and there is no contamination residue.

4)
Wheat plastic. This is the use of wheat flour added glycerol, glycol, silicone oil and other mixed dry, and then by adding pressure 150kz / Id to become plastic plastic film translucent, the advantage of using wheat plastic packaging food can be decomposed by microorganisms.

5)
Soybean plastic. U.S. uses soybean-derived proteins to produce plastic-like food packaging materials that can replace plastics synthesized from petroleum. This production technique involves soaking and grinding the soybeans to separate the proteins, drying the protein solution, removing the moisture, and mixing the protein powder with other ingredients and additives to make an edible film or coating. For food packaging. They have good strength, elasticity and moisture resistance.

6)
Chloroplast plastic. German scientists recently invented a chlorophyll dyed plastic film. Most green fruits and vegetables contain a large amount of chlorophyll, and this pigment undergoes photooxidation under light irradiation, which decomposes the energy in the food and causes the food to rot. The plastic film is "stained" with chlorophyll in a special way. After such a treated film is used to wrap food, it can be effective to "intercept" the light that causes the food to rot, thereby greatly prolonging the food preservation period.

7)
Bacteria plastic. British researchers recently developed a PHB bacterial plastic. It is to grow a kind of bacterium with sugar first, through processing and making the material similar to polypropylene. The material is non-toxic and easy to biodegrade. It is an ideal material for processing food packaging bags, and it has no pollution to the environment after abandonment.

8)
SEM film. The latest development of a special film that can detect bacteria, that is, a special coating on the surface of ordinary food packaging film, so that it can detect the special functions of bacteria, such as the detection film for raw and cooked meat packaging, If the packaged meat product is not fresh and the harmful bacteria content exceeds the food hygiene standards, packaging with this film will make the original transparent and colorless packaging film become a warning color, so that customers know that the meat food is no longer edible.


Other specific food packaging materials 1)
Sterilize absorbent food bags. Recently, the Russian Institute of Practical Biotechnology has developed a food packaging bag that can absorb water, sterilize, and can be used repeatedly, so that foods that are easily deteriorated, such as cheese sausages, can be stored for a long time. Russian experts have added dehydrated mineral salts and enzymes to food packaging polymers. The inner surface of the packaging bag rich in these substances can absorb excess moisture and kill bacteria, thus improving the internal environment of the packaging bag. The enzyme in the additive also regulates the odor of the food, creating a bottom-up space for nutrients in the food. In order to make the new type of bags available for repeated use, researchers have also researched that the bags can be reused nine times in a specific process, thereby reducing the packaging cost and reducing the production cost.


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

3)
Chitosan edible packaging film. The American Bureau of Agricultural Research used shellfish extract chitosan as the main raw material to combine chitosan with lauric acid with 12 carbon atoms to produce a uniform edible film. The thickness of this transparent film is only 0.2-0.3 mm. Packaging the peeled fruit or fruit slices with the packaging film not only has a good preservation effect, but also is not easily perceived by consumers and can be eaten together with the fruits.

4)
Protein, fatty acid, starch composite edible packaging film. The packaging film combines different ratios of proteins, fatty acids and starch to produce edible films of different physical properties. The larger the fatty acid molecules of the packaging film, the better the resistance to moisture loss by retarding the resistance.

Reprinted from: China Packaging Papers