A Sustainable Approach to Recycling Multi-Layer Aseptic Packaging

Document Type : Research Article

Authors

Faculty of Environment, University of Tehran, Tehran, Iran

Abstract

Recycling aseptic cartons poses significant challenges due to their complex multi-layer structure. This study focuses on optimizing the dissolution of low-density polyethylene (LDPE) to develop an efficient recycling method for these materials. Cartons from various brands were collected, cleaned, and dried, with LDPE dissolved using a solvent blend of xylene, toluene, and gasoline. The Plackett-Burman experimental design was employed to identify key factors affecting dissolution. The optimal solvent ratio was determined to be 50:25:25 (v/v) gasoline, xylene, and toluene. Critical parameters, in order of influence, included the solid-to-liquid ratio, double-layer seams, temperature, and time. Under optimal conditions (120°C for 30 minutes), complete LDPE dissolution was achieved across all brands. Recovery rates reached 100% for LDPE and 90% for the solvent. Traditional methods for separating aluminum from paper proved ineffective, but an eddy current separator (ECS) was identified as a viable solution. Furthermore, omitting the hydropulping step enhanced LDPE dissolution. This research paves the way for more effective recycling strategies, supporting sustainable waste management and advancing the circular economy. Additional studies on scalability, economic feasibility, and environmental impact are required for industrial application.

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Amirkabir Journal of Civil Engineering
Volume 57, Issue 10
in progress
January 2026

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