University of Oulu

Laitinen, O., Suopajärvi, T. & Liimatainen, H. Enhancing packaging board properties using micro- and nanofibers prepared from recycled board. Cellulose 27, 7215–7225 (2020).

Enhancing packaging board properties using micro- and nanofibers prepared from recycled board

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Author: Laitinen, Ossi1; Suopajärvi, Terhi1; Liimatainen, Henrikki1
Organizations: 1Fiber and Particle Engineering, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Springer Nature, 2020
Publish Date: 2020-11-02


In this study, cellulose microfibers and cellulose nanofibers (CNF) prepared from recycled boxboard pulp using a mechanical fine friction grinder were used as reinforcements in a board sheet. Micro- and nanofibers manufactured by mechanical grinding have typically broad particle size distribution, and they can contain both micro- and nano-sized fibrils. Deep eutectic solvent of choline chloride and urea was used as a non-hydrolytic pretreatment medium for the CNF, and reference CNF were used without any chemical pretreatment. The CNF were ground using three grinding levels (grinding time) and their dosage in the board varied from 2 to 6 wt%. The results indicate that the board properties could be tailored to obtain a balance between the processability and quality of the products by adjusting the amount of CNF that was added (2–6 wt%). A preliminary cost assessment indicated that the most economical way to enhance the board strength properties was to add around 4% of CNF with a moderate grinding level (i.e., grinding energy of 3–4 kWh/kg). Overall, the strength properties of the manufactured board sheets improved by several dozen percentages when CNF was used as the reinforcement.

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Series: Cellulose
ISSN: 0969-0239
ISSN-E: 1572-882X
ISSN-L: 0969-0239
Volume: 27
Issue: 12
Pages: 7215 - 7225
DOI: 10.1007/s10570-020-03264-w
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
221 Nanotechnology
215 Chemical engineering
Funding: Open access funding provided by University of Oulu including Oulu University Hospital. The authors would like to acknowledge the funding provided by the Council of Oulu Region, granted by the European Regional Development Fund of the European Union for the New bioproducts and—chemicals from cellulose side streams using DES-based refining concept project (SelDES).
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