Impact of high consistency enzymatic hydrolysis and defibration drying on cellulose fiber pore characteristics

Deepika Dahiya*, Sara Ceccherini, Thad C. Maloney

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
34 Downloads (Pure)


The purpose of this study is to examine the hornification of enzymatically hydrolyzed high consistency softwood kraft pulp in an experimental defibration dryer. This device dries pulp under turbulent conditions which can prevent interfiber bonding and produce a separated fiber population. This is useful in certain applications, such as composites, which require dry, unbonded pulp fibers. In this study, we examine how fibrillated pulps behave in the dryer with respect to pore expansion in hydrolysis and collapse in drying (hornification). It was found that the endoglucanase cocktail increased the micro-, meso-, and macropore volumes as a function of hydrolysis time. Drying decreased the pore volumes of each size category, with the biggest changes in the macropore region. The pulp with the highest swelling after hydrolysis had the lowest swelling after drying. The mesopores that were formed in hydrolysis were somewhat preserved after drying. After drying, unfibrillated pulp had good fiber separation, while the highly fibrillated samples formed sub-millimeter, spherical particles.

Original languageEnglish
Pages (from-to)7607-7618
Number of pages12
Issue number12
Early online date24 Jul 2023
Publication statusPublished - Aug 2023
MoE publication typeA1 Journal article-refereed


  • Defibration drying
  • Enzymatic hydrolysis
  • Hornification
  • Microfibrillated cellulose
  • Pore volume


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