Food packaging is an indispensable part of the food supply chain, acting as a protective layer for food to avoid the impact of external harmful substances. However, in today's increasingly serious environmental and sustainable development problems, the problems of climate warming and resource and energy crisis brought about by the massive use of traditional plastic packaging (petrochemicals) have become the focus of global attention. With the further upgrade of the "plastic restriction order", developing degradable food packaging materials to replace traditional plastic packaging and reducing white pollution has become the top priority in the field of food packaging.
At present, degradable plastics on the market can be divided into two types: "petroleum-based" and "bio-based", which are mainly distinguished by production raw materials. As a typical representative of bio-based materials, polylactic acid pellets resin (PLA pellets resin) has become a research hotspot for food packaging materials due to its excellent biodegradability and compatibility.
PLA resin advantages
PLA pure material is based on lactic acid of natural origin and has many advantageous properties such as high elastic modulus, high scratch resistance, very good printability, food contact approval, and resistance to fat and alcohol. Its life cycle load on the environment is significantly lower than that of petroleum-based materials, and burning PLA plastics do not increase the net CO2 content in the atmosphere. Even if buried in place, it can be degraded by microorganisms in the soil after one year.
The solution is carbon dioxide and water, which has good environmental and social benefits.
Among the many biodegradable bioplastics, PLA pellet is the first to enter the field of food packaging (disposable tableware and food packaging with a short shelf life), and is currently the main substitute for traditional food packaging plastics.
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