Compostable lids are primarily made from biopolymers, which are derived from renewable resources. One of common materials is PLA, a thermoplastic polyester synthesized from lactic acid. Lactic acid itself is produced by fermenting plant starches, typically corn or sugarcane. Another material used is PHA, which is produced by microorganisms through a fermentation process using sugar or lipids.
These biopolymers have properties similar to traditional plastics, making them suitable for manufacturing lids that can withstand the rigors of food service. However, unlike conventional plastics, compostable lids break down into natural elements under specific conditions, such as those found in industrial composting facilities.
The production process of compostable lids involves several steps. First, the raw materials are processed to create pellets. These pellets are then melted and molded into the desired shape using injection molding or thermoforming techniques. The result is a lid that is not only functional but also environmentally friendly.