Single-Step Thermoformable PLA-Based Formulation for Compostable Hot Beverage Lids

More than 500 billion disposable paper cups are used globally each year for hot and cold beverages, most of which are sealed with polypropylene (PP) or polystyrene (PS) lids. These lids, often contaminated with beverage residue, are difficult to recycle, persist in the environment, and can leach styrene into hot liquids. Like other mismanaged plastic waste, single-use beverage lids contribute significantly to marine pollution, impacting biodiversity and highlighting the urgent need for more sustainable packaging solutions. Currently, PLA-based lids for hot beverages are typically produced using a two-step crystallized PET (cPET) process. However, since most lid manufacturers are equipped for a single-stage process optimized for PS or PP, transitioning to PLA has been challenging. This presentation introduces an innovative compostable lid formulation that enables thermoforming in a single step, allowing manufacturers to leverage existing production infrastructure while providing a more sustainable alternative to conventional PS lids.