Separation technology for interior barrier layers in multilayer polymer films

Overview

This solution addresses the challenge of separating interior barrier layers from polyolefin layers in multilayer polymer films. Using a patent-pending process that applies selective solvents together with heat and shear, the technology enables efficient recovery of high-value barrier materials such as ethylene vinyl alcohol (EVOH) and nylon while maintaining the integrity of polyolefin layers. The approach supports recycling of these materials and reduces overall system costs by enabling solvent reuse.

Technical specifications

• Selective Solvation: Uses solvents to selectively dissolve target barrier layers without fully dissolving the entire film
• Recovery Methods: Provides multiple recovery options for high-value polymers, including precipitation, temperature-swing, and supercritical carbon dioxide pressure-swing processes
• Material Compatibility: Demonstrated with commercial multilayer film products, including coffee k-cups, baby food tubs, and pet food trays
• Separation Efficiency: Enables separation of mixed external layer films (e.g., PO-EVOH-PET) using a simple float process

Technology readiness level

The technology is at TRL 4, validated in a laboratory environment. Future work includes further process development, scale-up, and economic analysis to support real-world application and commercialization.