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the paper properties were measured after restrained and unrestrained drying. Alginate resulted in stiffer and stronger paper than the other tested polysaccha- rides after restrained drying. Alginate also increased the 2D formability strain of papers after unrestrained drying to a higher extent. Addition of alginate resulted in the formation of a film on the topside of the paper, which decreased the air permeability of the paper significantly and lead to enhanced paper shrinkage. Out of the tested polysaccharides, alginate was found to be the most promising candidate for future pack- aging applications due to the fact that it gave strong and stiff model films, enhanced paper shrinkage, effectively lowered the air permeability of the paper, and formed a layer on the topside of the paper. Open access funding provided by Abo Akademi University (ABO). This work is a part of the project ExtBioNet, appointed by the Academy of Finland. Special thanks to technology student Richard Sundberg, Academic Lecturer Mari Nurmi at The Laboratory of Paper Coating and Converting, A˚ bo Akademi University, and PhD Vinay Kumar at The Laboratory of Paper Coating and Converting, A˚ bo Akademi University (currently with VTT). Acknowledgments Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unre- stricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Com- mons license, and indicate if changes were made.
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