Analysis of the most popular new flexible packagin

Analysis of new flexible packaging materials to ensure food safety (Part 2)

Second, plastic bag packaging materials

Plastic packaging materials have the advantages of light weight, convenient transportation and sales, good chemical stability, easy processing, good decorative effect, and good protection for food. However, there are still some health and safety problems. For example, the surface pollutants of plastic packaging cause the micro dust and impurities on the packaging surface to pollute the food. Toxic monomer residues and toxic additive residues of plastic packaging materials. In addition, improper recycling or treatment of packaging materials will also cause food pollution when reused. Plastic bag packaging materials are developing in the direction of non pollution and safety

1. antibacterial film

the main reason for deterioration is the breeding of microorganisms on the surface of food. Adding anti microbial enzymes or other substances to packaging materials can greatly improve the storage life of food. Antibacterial film is a typical representative of this kind of material. For example, biological enzymes can be added to packaging paper and packaging film, which can make them have the functions of oxidation resistance, sterilization, delaying the reaction speed of enzymes in food, etc; In addition, biological enzymes can also be made into preservatives and mixed into food containers alone or to extend the shelf life of food. Glucose oxidase and lysozyme are commonly used in food packaging. The former's greatest role in food preservation and packaging is to remove oxygen and extend the shelf life of food; The latter is mainly used as a preservative to inhibit bacteria. Antibacterial substances such as silver and copper ions, quaternary ammonium salts, nisin and Chamberlain can also be added to the packaging materials. For example, Japan has successfully developed a series of antibacterial packaging materials with silver zeolite antibacterial film as raw material, which has antibacterial effect on a variety of pathogenic bacteria. From which aspects can a good tensile testing machine be judged? When purchasing a tensile testing machine, customers will generally judge the main characteristics of the material from many aspects as follows: the antibacterial effect lasts for a long time. Because the antibacterial agent is gas-phase, it has no adverse effect on the inner package and has good stability; In the process of packaging and processing, it has high thermal stability, stable concentration and no adverse impact on the working environment. At present, antibacterial packaging materials are widely used in antibacterial packaging films, which are made by adding antibacterial agents to polyolefin films, and have antibacterial effects on most common microorganisms such as Escherichia coli, Staphylococcus aureus, Bacillus perforans, Aspergillus niger, etc

the Russian Academy of practical technology has recently 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. In addition, the enzyme in the additive can also regulate the smell of food

2. High barrier film

high barrier film is a film with multi-layer structure, which is extruded from a material with strong gas barrier and polyolefin with strong thermal stitching and moisture resistance. The use of high barrier film can prevent microbial reproduction caused by the penetration of oxygen and other gases; Prevent the oxidation of contents caused by oxygen penetration; Prevent the outflow of fragrance, solvent, etc., and improve the storage of contents. It is mainly used for the packaging of meat processing products (ham, incense, although the export volume of China's experimental machine is larger than that of large intestine, fresh fish jelly, clam slices), raw meat, cheese, salad dressing, sauces, agricultural products and seafood processing products

3. composite plastic materials

American researchers have developed a corn plastic packaging material that is easy to decompose. It extracts three genes that can produce plastic from bacteria that produce biopolymers, and then transfers them to rape plants. After a period of time, a plastic polymer liquid is produced, and a rape plastic can be obtained after refining and processing. The food packaging materials processed with this kind of plastic can decompose by itself after being discarded, and there is no pollution residue

and wheat plastic. This is the use of wheat flour, glycerin, glycol, silicone oil, etc. mixed and dried, and then hot pressed into a translucent thermoplastic film. The advantage of packaging food with wheat plastic is that it can be decomposed by microorganisms

British researchers have recently developed a PHB bacterial plastic. It first uses sugar to cultivate a bacterium, and then processes it into a material similar to polypropylene. This kind of material is non-toxic and easy to biodegrade. It is an ideal material for processing and making food packaging bags. At the same time, there is no pollution to the environment after abandonment

in a word, the development trend of newly developed food flexible packaging materials at home and abroad is towards high-performance, non-toxic and harmless, green environmental protection, convenient use and safety. At the same time, the new packaging materials are introduced, and their recycling technology is introduced simultaneously, so as to minimize the damage of packaging to the ecological environment

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