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PLA is one of the most researched biodegradable materials at home and abroad. Food packaging, disposable tableware and medical materials are its three popular application fields. PLA uses natural lactic acid as the main raw material. It has good biodegradability and biocompatibility. Its life cycle load on the environment is significantly lower than that of petroleum-based materials. It is considered to be the most promising green packaging material.
Biodegradable plastic refers to a material that can be degraded into low molecular weight substances by microorganisms themselves or their secretions under certain conditions. The U.S. Food and Drug Administration stipulates that, except for biodegradable plastics and very few water-degradable plastics that can be used in the field of food packaging, other such as photodegradable plastics or photo-biodegradable plastics fail to meet the regulations as food packaging materials.
Polylactic acid (PLA) can be completely decomposed into carbon dioxide and water under natural conditions after being discarded. It has good water resistance, mechanical properties, biocompatibility, can be absorbed by organisms, and has no pollution to the environment. At the same time, PLA also has good mechanical properties. It has high impact strength, good flexibility and thermal stability, plasticity, processability, no discoloration, good permeability to oxygen and water vapor, good transparency, mildew resistance and antibacterial , service life of 2 to 3 years.
Film food packaging
The more important performance index of packaging materials is air permeability, and the application field of this material in packaging can be determined according to the air permeability of the material. Some packaging materials are required to be breathable to oxygen to supply the product with enough oxygen; some packaging materials are required to be barrier to oxygen in terms of material, such as packaging for beverages, which require materials that can prevent oxygen from entering the packaging to inhibit mold The role of growth. PLA has gas barrier, water barrier, transparency and good printability.
transparency
PLA has good transparency and gloss, and its excellent performance is equivalent to that of cellophane and PET, which is a property that other degradable plastics do not have. The transparency and gloss of PLA are 2 to 3 times that of ordinary PP films, and 10 times that of LD+PE. Its high transparency makes the use of PLA as a packaging material beautiful in appearance. For example, for candy packaging, at present, many candy packaging on the market use PLA packaging film.
