At a era of growing environmental awareness, non-woven bags have become an alternative to traditional plastic bags due to their durability, lightweight and reusability. However, controversy still surrounds their biodegradability persist. In this paper, the degradation characteristics of nonwoven bags are systematically studied, the influence of nonwoven bags on the environment is discussed, and the future direction of sustainable packaging is prospected by combining materials science, environmental policy and industrial practice.
Composition and degradation Fundamentals of non-woven cloth bags
The core material of non-woven bag is polypropylene (PP) or polyester (PET), both synthetic plastics. Polypropylene is produced by chemical polymerization and has stable molecular chains that resist microbial decomposition in natural environment. Studies have shown that polypropylene requires 20–100 years to fully degrade in soil, releasing microplastic particles that pose long-term ecological risks.
Take Meituan's food delivery packaging: Meituan non-woven cloth bags typically use 60–100 g/m2 polypropylene. While businesses advertise these items as "reusable," consumers often discard them due to stains or damage. Hainan Province's 2023 List of Prohibited Production, Sale and Use of Non-Degradable Plastic Items explicitly prohibits the production, sale and use of non-woven shopping bags less than 100 g/m2 on the grounds their non-degradable nature.
Core Contradictions in Degradability Debates
Material Essence vs. Misleading marketing
"Non-woven cloth" (Chinese translation for "cloth")creates confusion because the bags are essentially plastic.Businessmen often label them "eco-bags" while downplaying their non-degradable properties. One seller on an e-commerce platform, for example, acknowledged that food delivery packaging, which uses mainly PP non-woven fabric, degrades as quickly as traditional plastic bags. This disconnect between marketing claims and reality adds to public skepticism.
2.Reusability vs. Actual Behavior
In theory, thick nonwoven bags (e.g., ≥120 g/m2) can reduce environmental impact through reuse. However, according Meituan's Green Initiative survey, consumers reuse plastic bags an average of less than five times, well below their designed lifespan. Physical barriers-such as high cleaning costs and inconvenience-further discourage reuse. Henan Longdu Tianren Biomaterials Co., Ltd., says even eco-cotton bags can lose their environmental advantages if discarded after single use.
3.Recycling Limitations
Polypropylene can be recycled into pellets, but the actual recycling rate remains below 15% for the following reasons:
- Sorting challenges: Non-woven bags are often mixed with textiles, increasing processing costs;
- Degradation of pollution: additives such as inks and adhesives may release toxins during recycling;
- Low economic returns: the cost Recycled PP accounts for 60 per cent of the cost of raw materials, reducing enterprise incentives.
Breakthroughs and challenges in Degradable Alternatives
1.Rise of bio-based materials
Polylactic acid (PLA), a bio-based degradable material, is receiving increasing attention in non-woven applications. PLA is fermented from corn or cassava starch and degrades to CO2 and water within six to 12 months. Longdu Tianren, for example, provides Meituan with biodegradable delivery bags made from a PLA/PBAT (polybutylene adipate terephthalate) blends that decomposes completely in 180 days under industrial composting conditions.
However, PLA faces two major obstacles:
- High cost: PLA feedstock cost 2-3 times more than polypropylene;
- Performance limitations: Its low heat resistance (melting point: 170°C) limits the use of high-temperature packaging.
2.Natural Fibers regeneration
Jute, flax and other natural fibres are increasingly popular for their biodegradability and ecological benefits. Jute non-woven nursery bags, produced through acupuncture, not only degrade naturally, but also enrich soil with potassium and phosphorus. Research by India's Central Leather Research Institute shows that jute bags increase root penetration by 40% and soil organic matter by 15% afterdegradation compared to PP bags.
However, industrialization of natural fibres requires overcoming the following problems:
- Strength deficiencies: Jute's tensile strength is one third of polypropylene and chemical modification is needed.
- Processing complexity: The degreasing and grooming process increases production costs.
3.Composite Innovations
To balance performance and cost, researchers developed a hybrid material. Mixing PLA with bamboo fibers improves heat resistance and flexibility, while adding nanocellulose to starch reduces degradation time to three months. Toray Industries' "Eco-friendly Nonwoven" series combines PLA with chitosan and degrades 50% faster in seawater than pure PLA.
INTRODUCTION Dual Drivers: Policy and Market Forces
1.Global plastic sealers upgraded
By 2025, 63 countries have plastic bans and major economies such as the EU, China and the U.S. have restricted non-degradable non-woven products. The EU's Single-Use Plastics Directive mandates all non-woven products to at least 30% degradable content by 2030.
2.Changing Consumer Preferences
Gen Z's demand for "zero-carbon packaging" is accelerating brand adoption of degradable materials. Starbucks' 2024 "Planted Tote Bag," made from sugarcane waste and PLA composites, sold 5 million units in three months. Market research indicates 76% of consumers are willing to pay between 10 and 20 per cent more for degradable packaging.
3.Maturing Industrial Ecosystems
The biomass energy supply chain is expanding rapidly. By 2025, the country will have a production capacity of more than 3 million tons of bio-based materials, with PLA accounting for 40 per cent. Government policies,including tax breaks and research and development subsidies,have nurtured bellwether companies such as Longdu Tianren and Kingfa Scientific. At the same time, industrial composting coverage has increased from 12% in 2020 to 68% by 2025, ensuring end treatment.
Future Vision: from "substitution" to "transformation"
The ultimate goal of degradable non-woven materials is not merely to replace plastics, but also to establish closed-loop systems:
Intelligent degradation: Under certain conditions, additives sensitive to light or enzymes can accelerate degradation;
Marine-degradable polymers: development of polyesters that break down in seawater to prevent ocean plastic pollution;
Carbon footprint tracking: Blockchain technology monitors life-cycle emissions to comply with ESG regulations.
Conclusion:
The debate over the degradability of non-woven bags reflects the conflict between traditional plastic economy and sustainable development models. While challenges such as cost and performance persist, policy support, technological innovation and market demand are driving packaging industries to go green. Future advancements in materials science and industrial ecosystems have the potential to elevate degradable non-woven bags from "eco-alternatives" to holistic environmental solutions to reduce the burden on the planet for future generations.
