Upgrading E-Commerce Logistics Cushioning Packaging — The Path of Biodegradable Foam Replacing Conventional Foam

The rapid development of the e-commerce logistics industry has generated massive amounts of packaging waste. Among them, conventional EPS foam cushioning materials are widely used due to their light weight, low cost and good cushioning performance. However, EPS is a non-degradable plastic that takes hundreds of years to decompose in the natural environment, and large quantities of discarded foam cause severe white pollution. As global plastic-restriction policies intensify and consumer environmental awareness rises, e-commerce logistics cushioning packaging is accelerating its transition toward biodegradability and circularity. PLA biodegradable foam has emerged as one of the most promising alternatives, with its mass production realized by the PLA Foam Sheet Extrusion Line.

PLA, short for polylactic acid, is a bio-based polymer material prepared from renewable plant resources such as corn starch and cassava. Under industrial composting conditions, PLA foam can be completely decomposed by microorganisms into carbon dioxide and water within 180 days, leaving no plastic residues and solving the environmental problem of packaging waste at the source. Meanwhile, PLA foam offers good cushioning and shock-absorption performance, and its closed-cell structure provides decent thermal insulation, meeting the anti-bruising and thermal-insulation requirements during e-commerce product transportation. It is suitable for packaging a wide range of categories including electronic products, cosmetics, fresh food and pharmaceutical reagents.

From a production-process perspective, the PLA Foam Sheet Extrusion Line adopts supercritical CO₂ physical foaming technology. No chemical blowing agents are used throughout the process, there are no VOC emissions during production, and finished products contain no harmful substance residues, complying with food-contact packaging safety standards. The equipment is equipped with dedicated screws and segmented temperature-control systems, enabling precise control of PLA melt plasticization temperature and foaming back pressure, and stably mass-producing PLA foam sheets with uniform cells and consistent thickness. After cutting and forming, the sheets can be directly used as cushioning liners and insulation-box inner liners, or laminated with materials such as pulp and non-woven fabric to produce eco-friendly packaging products.

Nevertheless, the large-scale promotion of PLA biodegradable foam still faces practical challenges. First, raw-material costs are relatively high; PLA resin prices are approximately 2 to 3 times those of conventional PS, driving up finished packaging costs and resulting in limited acceptance among price-sensitive e-commerce merchants. Second, PLA has low melt strength and a narrow processing window, imposing high requirements on the temperature-control precision and screw design of the PLA Foam Sheet Extrusion Line, with initial equipment investment exceeding that of conventional EPS foaming lines. In addition, PLA’s heat resistance needs improvement; ordinary PLA foam tends to soften and deform above 60°C, unable to meet packaging scenarios requiring high-temperature insulation.

To address these issues, the industry is optimizing through multiple technical pathways. At the formula level, toughening agents such as PBAT and PBS, along with nucleating agents, are added to improve PLA melt strength and heat resistance, broadening the processing window. At the process level, the screw structure and cooling-setting system of the PLA Foam Sheet Extrusion Line are optimized to enhance mass-production stability and finished-product yield. At the cost level, as PLA raw-material capacity expands and large-scale production advances, material prices show a year-by-year downward trend. Meanwhile, pairing with a PS foam recycling machine to recycle and re-pelletize production scraps on-site for blending back into the production line can further reduce raw-material loss and overall costs.

For conventional EPS foam packaging manufacturers, the transition to biodegradable packaging does not require replacing all equipment at once. Existing extrusion lines can first be retrofitted with modified screws, dies and temperature-control systems to become compatible with PLA raw material production. Once market orders stabilize, dedicated PLA Foam Sheet Extrusion Lines can be gradually added. Meanwhile, equipping a PLA foam recycling pelletizer allows continued recycling and regeneration of conventional foam waste during the transition period, balancing environmental compliance with production-cost control and smoothly achieving the green upgrade of packaging materials.