Abstract
Recycled paper has become increasingly used as a raw material in the paper industry. However, hornification limits its application. Herein, the effect of recycling on the mechanical properties and microstructure of khasi pine pulp was systematically studied. The mechanical properties deteriorated and water retention value decreased after recycling. X-ray diffraction and Fourier-transform infrared spectroscopy revealed that cellulose crystallinity increased and partial cocrystallization occurred on cellulose microfibrils. Through the analysis of the morphology of secondary fibers by FQA, the loss of fine fibers caused by each reuse was found. Using the filtration method to prepare the recycled paper reduced the loss of fine fibers and improved the mechanical properties, with the tensile strength of a sample prepared using a sand core filter unit for five cycles (8.37 MPa) being like that of a sample prepared using a paper machine after one cycle. The investigation of the internal structure of the paper showed that the retained fine fibers were bonded between the long fibers, promoting the bonding between the fibers. Fine fibers improve the curling and twisting of fibers to some extent, especially in the first three recycling cycles. The hornification phenomenon of recycled paper was studied from the viewpoint of the fiber components, which is important to promote the development and application prospect of recycled paper.
Funding source: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China
Award Identifier / Grant number: 22178155
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: Unassigned
Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 22178155).
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Research ethics: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: The authors states no conflict of interest.
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Research funding: This work was supported by National Outstanding Youth Science Fund Project of National Natural Science Foundation of China. (http://dx.doi.org/10.13039/100014717; 22178155) and National Natural Science Foundation of China.
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Data availability: Not applicable.
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Supplementary Material
This article contains supplementary material (https://doi.org/10.1515/npprj-2023-0062).
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Artikel in diesem Heft
- Frontmatter
- Biorefining
- Organic acid fractionation of hardwoods planted in social forestry
- Paper Technology
- Effect of fine fibers on secondary fibers and recycled paper
- Paper Chemistry
- Increased recyclability of wet strengthened liquid packaging board, through synergetic effects of combining CMC and PAE – a case study in full scale
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Artikel in diesem Heft
- Frontmatter
- Biorefining
- Organic acid fractionation of hardwoods planted in social forestry
- Paper Technology
- Effect of fine fibers on secondary fibers and recycled paper
- Paper Chemistry
- Increased recyclability of wet strengthened liquid packaging board, through synergetic effects of combining CMC and PAE – a case study in full scale
- Packaging
- Printable active packaging film with Pelargonium graveolens oil
- Chemical Technology/Modifications
- Water uptake as a fuel for soft actuators from cellulose
- Miscellaneous
- Nanofibers/reduced graphene oxide/polypyrrole for High-performance electrode material
- Chemical properties, crystallinity, and fiber biometry of Jabon (Anthocephalus cadamba) wood for pulp raw material: the effect of age and position
- Penetration and spreading of graphene oxide ink in rice paper enabling its unique expressiveness in Chinese paintings