Comparative Analysis of Fiber Characteristics on Recycling Potential and Paper Properties of Milk Cartons and PE-Coated Cardboard

Abstract

This study examines the fiber characteristics and resultant paper properties of disintegrated milk cartons and polyethylene (PE)-coated cardboard to assess their recycling potential. Key differences were observed in the fiber length, fines content, and coarseness of the cartons and cardboard. The milk cartons exhibited longer and coarser fibers, whereas the PE-coated cardboard had shorter fibers and lower coarseness. The paper made from milk cartons exhibited higher freeness, lower bulk, higher tear strength, and enhanced brightness compared to those of the paper made from the cardboard, making it ideal for durable, high-clarity applications. In contrast, the PE-coated cardboard yielded paper with a higher tensile strength and bulk, aligning with the need for flexible and opaque materials. These findings underscore the necessity of understanding fiber properties to optimize recycling strategies and tailor paper products to advance the sustainability and functionality of recycled materials.