Modification of natural fibers for biobased packaging

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master_Sattar_Hamza_2025.pdf (2.26 MB)

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School of Chemical Engineering | Master's thesis
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Date

2024-11-20

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Major/Subject

Fibre and Polymer Engineering

Mcode

Degree programme

Master's Programme in Chemical, Biochemical and Materials Engineering

Language

en

Pages

62

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Abstract

This thesis investigates the modification of natural fibers to enhance their suitability for biobased packaging. The primary goal is to improve the dimensional stability and strength of paper made from natural wood fibers by refining the fibers under different mechanical and chemical conditions. The study uses kraft pulp from both hardwood and softwood sources (Eucalyptus, Birch, Pine), subjecting them to refining processes under neutral and alkaline conditions. Key methods include measuring Schopper Riegler (SR) number, tensile strength, water retention value, and hygroexpansion. The results demonstrate that fiber refinement improves bonding and mechanical properties, leading to more stable and durable paper. Birch fibers showed the highest increase in SR numbers, while Pine fibers, although more resilient, exhibited the least refinement response. Elevated pH conditions further enhanced fiber bonding and water retention across all species. These findings provide insights into optimizing fiber treatments for sustainable packaging materials.

Description

Supervisor

Paltakari, Jouni

Thesis advisor

Basnayaka, Madhawa

Keywords

beating, refining, natural fibers, dimensional stability, hygroexpansion, paper

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https://urn.fi/URN:NBN:fi:aalto-202501241676

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[dipl] Kemian tekniikan korkeakoulu / CHEM