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Why is polylactic acid fiber used in the manufacturing of food packaging
source：www.03559659.cn | Release time：2025-02-111. Biological characteristics
Good biocompatibility: Polylactic acid fiber has good biocompatibility, and when in contact with food, it will not release harmful substances to the human body, which will not affect the safety and quality of food. It can ensure the health of consumers and comply with strict hygiene standards for food packaging materials.
Biodegradable: In natural environments, polylactic acid fibers can gradually decompose into carbon dioxide and water under the action of microorganisms, and the decomposition products will not cause pollution to the environment. This feature enables food packaging to naturally degrade after disposal, reducing waste accumulation and lowering environmental pressure, in line with environmental protection concepts and sustainable development requirements.
2. Physical properties
Good mechanical properties: Polylactic acid fibers have certain strength and toughness, and the packaging materials made of them can withstand certain pressure and tension, are not easily broken or damaged, and can effectively protect the integrity of food during transportation, storage, and sales. For example, packaging bags made of polylactic acid fibers can withstand a certain weight of food and are less prone to damage and leakage.
Moderate barrier performance: Polylactic acid fibers have certain barrier properties against oxygen, water vapor, etc., which can prevent food from getting damp and oxidized to a certain extent, and extend the shelf life of food. Although its barrier performance is not as good as some traditional plastic packaging materials, it can meet the packaging requirements of most foods through appropriate modification or composite with other materials. For example, for some baked goods stored for a short period of time, polylactic acid fiber packaging can effectively maintain their taste and freshness.
High transparency: Polylactic acid fiber has good transparency, and the packaging material made from it can allow consumers to clearly see the food inside the packaging, increasing the visibility and attractiveness of the food, which is beneficial for product sales. For example, transparent packaging boxes made of polylactic acid fibers are commonly used to package fruits, candies, and other foods, which can effectively display the color and appearance of the food.
3. Processing performance
Easy to process and shape: Polylactic acid fiber has good thermal stability and flowability, and can be easily processed into various shapes and sizes of food packaging containers and films through various processing methods such as blow molding, injection molding, extrusion, etc., which can meet the packaging needs of different foods. For example, polylactic acid fiber beverage bottles can be made through blow molding technology, and polylactic acid fiber films can be made through extrusion technology for packaging bread, vegetables, etc.
Good printing adaptability: The surface of polylactic acid fiber can undergo good printing and coating treatment, which can print exquisite patterns and text, provide relevant information and promotion, enhance the visual effect and market competitiveness of food packaging.
4. Other advantages
Renewable sources: Polylactic acid fibers are usually made from renewable plant resources such as corn and cassava through fermentation, polymerization, and other processes. Their raw materials are widely sourced and renewable, reducing dependence on non renewable resources such as petroleum and having good resource sustainability.
In line with policy orientation: With the global emphasis on environmental protection, governments around the world have introduced policies to encourage the use of environmentally friendly packaging materials and restrict the use of traditional plastic packaging. As an environmentally friendly material, polylactic acid fiber meets policy requirements and helps companies comply with environmental regulations, enhancing their social image.
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