Manufacture of fine cellulose powder from chemically crosslinked kraft pulp sheets using dry milling

Antti Korpela (Corresponding Author), Hannes Orelma (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)


The present study concerns the preparation of cellulosic powders with two-stage dry milling of chemically crosslinked birch kraft pulp sheets. Chemical crosslinking of kraft pulp sheets using glyoxal with and without a catalyst (aluminium sulphate) made the pliable, tenacious kraft pulp sheets brittle. Due to the brittleness, the crosslinked pulp sheets could be disintegrated easily and rapidly using a Wiley mill. The length-weighted average fibre length of the crosslinked pulp powders (0.31–0.33 mm) was shorter than the Wiley-milled reference powder (0.44 mm). The notably higher density and less fluffy character of the crosslinked pulp powders enabled their effortless further processing with an air-flow-type ultra-fine microniser. The medium size value (D50) of the micronised crosslinked powders was around 40 μm. The study finds that chemical crosslinking pre-treatment enhances the dry milling of kraft pulps to a fine powder. Chemical crosslinking may offer a new tool for industrial cellulosic powder manufacturing.
Original languageEnglish
Pages (from-to)642-650
Number of pages9
JournalPowder Technology
Early online date21 Nov 2019
Publication statusPublished - 1 Feb 2020
MoE publication typeA1 Journal article-refereed


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