Biodegradable Materials in Sustainable Food Packaging: Advantages, Characteristics & Applications

In the field of food packaging bag, the application of biodegradable materials is an important direction to solve the problem of traditional plastic pollution, ensure food safety and environmental sustainability. The following is a detailed introduction to the advantages, characteristics and specific applications of commonly used biodegradable materials in food packaging bag:

1.Core Advantages of  Biodegradable Materials in Food Packaging  Bag

1.Dual Guarantee of Safety and Environmental Protection

Food-grade biodegradable materials must meet strict food contact standards (such as  EU Regulation 10/2011). Their raw materials and degradation products (carbon dioxide, water, biomass) are non-toxic and harmless, avoiding the health risks caused by the migration of traditional plastic additives (such as plasticizers) into food. At the same time, the materials can be naturally degraded after being discarded, reducing the impact of 'white pollution' on soil and ecology.

2.Adapting to the Needs of Food Preservation

Some biodegradable materials have good barrier properties (such as oxygen resistance and water resistance), which can meet the requirements of food for a fresh-keeping environment and extend the shelf life. For example, when used in the packaging of fresh food, bread and other foods, they can take into account both environmental protection and fresh-keeping functions.

3. Driven by Both Policies and Markets

Global plastic ban and plastic restriction legislation, for example, like the foundation for a legally binding international agreement to eradicate plastic pollution by 2024 was established by the UN resolution passed in March 2022, and has encouraged the food industry to prioritize biodegradable materials. Increased consumer awareness of environmental issues also increases the likelihood that the market will notice food packaged in biodegradable materials.A 2023 MDPI survey of 1,000 consumers found that environmentally conscious attitudes significantly influence purchasing decisions.The study comes to the conclusion that demand for eco friendly packaging for food goods, particularly in organic markets, is directly impacted by consumer awareness.

Characteristics of Common Biodegradable Materials in  Food Sustainable Packaging

Commonly used biodegradable materials in food sustainable packaging mainly include polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), starch-based composite materials, polyhydroxyalkanoates (PHA), etc. Their respective characteristics are as follows:

 Specific Applications of Biodegradable Materials in Food Sustainable Packaging

According to the characteristics of materials, different biodegradable materials have different application scenarios in food packaging pouch:

1.Packaging for Fresh Fruits and Vegetables

◦ Suitable materials: PLA/PBAT composite film, PHA film.

◦ Applications: making fresh-keeping bags and plastic wrap. The high transparency of PLA is convenient for consumers to observe the state of food, the flexibility of PBAT improves the ductility of packaging, and the oxygen resistance of PHA can delay the oxidation and deterioration of fruits and vegetables, extending the shelf life.

2. Baking and Snack Packaging

◦ Suitable materials: starch-based composite materials, PLA film.

◦ Applications: making bread bags, biscuit bags, potato chip bags, etc. Starch-based materials have low cost and are suitable for packaging dry food; PLA film has good printability, can meet the pattern design requirements of snack packaging, and is non-toxic and tasteless, meeting the requirements of food contact.

3. Takeout and Fast Food Packaging

◦ Suitable materials: PBAT/PLA blended film, PLA coated paper.

◦ Applications: making outer packaging of takeout lunch boxes and food bags. The flexibility and low-temperature resistance of PBAT are suitable for packaging refrigerated food, while PLA coated paper has both the stiffness of paper and degradability, and is often used for oil-proof packaging of hot food such as hamburgers and fried chickens (attention should be paid to the heat resistance limit of PLA to avoid direct contact with food above 100℃).

4. Liquid Packaging

◦ Suitable materials: PHA composite film, modified starch-based film (with water-resistant layer).

◦ Applications: making small-capacity packaging bags for fruit juice and sauce. The oil resistance and barrier property of PHA can prevent liquid leakage, and the modified starch-based film improves water resistance through a multi-layer structure, suitable for packaging sauces, condiments, etc.

5. Disposable Food Contact Bags

◦ Suitable materials: all-starch-based film, PLA film.

◦ Applications: making bulk food bags in supermarkets and garbage bags (used with food packaging). All-starch-based film degrades quickly in the natural environment, suitable for one-time and short-term use scenarios, and has high safety, which can be in direct contact with food.

Summary

Commonly used biodegradable materials in sustainbale food packaging are mainly PLA, PBAT, starch-based composite materials and PHA. Their advantages in safety, environmental protection and functional adaptability enable them to meet the packaging needs of various foods such as fresh food, baked goods and takeout. With the progress of technology, the cost of these materials will be further reduced, and their properties (such as heat resistance and barrier property) will continue to be optimized, becoming the core choice for the food packaging industry to reduce plastic use and carbon emissions.

Contact the Puropak team to learn more about our custom sustainbale food packaging for wholesale food packaging manufacturers.