This technical analysis evaluates the primary types of plastic used in disposable lunch boxes, ranging from traditional petroleum-based polymers to advanced plant-based composites. It identifies Polypropylene (PP) and Polystyrene (PS) as industry standards due to their low cost and molding performance, while highlighting the shift toward cornstarch-based biodegradable materials to reduce environmental impact. The article examines the material science behind composite formulations—specifically those blending 60% cornstarch with PPT plastics—to achieve waterproof, oil-proof, and high-temperature stability between -5°C and 125°C. Furthermore, it provides data on how small amounts of PLA or PP blends improve the structural strength of eco-friendly containers, ensuring they remain microwave-safe and durable in large formats like 1200 ml and 2000 ml. The guide concludes with a comparison of degradation timelines, noting that biodegradable alternatives break down in approximately 180 days.

This article explains the complete disposable lunch box production process, detailing how cornstarch-based materials are prepared, mixed, molded, and inspected to create durable, eco-friendly food containers suitable for large-scale wholesale supply.