Physical Changes in Recycled Pulps and Fibers

What is it about?

* This study aimed to understand the physical changes that occur in recycled pulps and fibers during the papermaking process. * Various characterization techniques were used to analyze the properties of the recycled pulps and fibers, including fiber saturation point, X-ray microtomography, environmental scanning electron microscopy, atomic force microscopy, and inverse size exclusion chromatography. * The study found that recycling led to a decrease in fiber width, cell wall thickness, curl, kink, and irregularities, making the fibers harder and more brittle in a dry state. * The number of weak points in the fiber wall increased initially and in subsequent recycling cycles. * The study also observed changes in wet breaking length, bonded area, and the quality of the bond, indicating the impact of recycling on the strength and properties of the paper.

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Photo by Juliane Liebermann on Unsplash

Photo by Juliane Liebermann on Unsplash

Why is it important?

* This study focuses on the physical changes that occur in recycled pulps and fibers during the papermaking process. * The use of non-conventional characterization techniques such as fiber saturation point, X-ray microtomography, environmental scanning electron microscopy, atomic force microscopy, and inverse size exclusion chromatography sets this work apart. * The study aims to understand the complex nature of the loss in strength during recycling and goes beyond the commonly held belief that fiber hornification is solely responsible. It explores the morphological and ultrastructural changes associated with recycling, providing a more comprehensive understanding of the process. * The findings of this study have implications for the papermaking industry, as understanding the physical changes in recycled pulps and fibers can help optimize the recycling process and improve the quality of high-value paper products. * The inclusion of recycled fibers in paper products can reduce costs and environmental impact, making this research relevant in the context of sustainability and circular economy practices. * By shedding light on the physical changes that occur during recycling, this work contributes to the body of knowledge on pulp, fiber, and paper properties, potentially attracting readers interested in the field of papermaking and recycling.