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

Abstract

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
JournalPowder Technology
DOIs
Publication statusE-pub ahead of print - 21 Nov 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

Kraft pulp
Cellulose
Powders
Crosslinking
Pulp
Glyoxal
Brittleness
Aluminum
Catalysts
Fibers
Processing
Air

Cite this

@article{7480cf29205643c6884dc8c1b0e7e6a4,
title = "Manufacture of fine cellulose powder from chemically crosslinked kraft pulp sheets using dry milling",
abstract = "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.",
author = "Antti Korpela and Hannes Orelma",
year = "2019",
month = "11",
day = "21",
doi = "10.1016/j.powtec.2019.11.064",
language = "English",
journal = "Powder Technology",
issn = "0032-5910",
publisher = "Elsevier",

}

TY - JOUR

T1 - Manufacture of fine cellulose powder from chemically crosslinked kraft pulp sheets using dry milling

AU - Korpela, Antti

AU - Orelma, Hannes

PY - 2019/11/21

Y1 - 2019/11/21

N2 - 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.

AB - 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.

U2 - 10.1016/j.powtec.2019.11.064

DO - 10.1016/j.powtec.2019.11.064

M3 - Article

JO - Powder Technology

JF - Powder Technology

SN - 0032-5910

ER -