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External fibrillation of wood pulp
Tappi journal, 2023-06, Vol.22 (6), p.363-371
ISSN: 0734-1415 ;EISSN: 0734-1415 ;DOI: 10.32964/TJ22.6.363
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Title:
External fibrillation of wood pulp
Author:
KEREKES, RICHARD J.
;
MCDONALD, DAVID
;
MELTZER, FRANK P.
Is Part Of:
Tappi journal, 2023-06, Vol.22 (6), p.363-371
Description:
Pulp refining produces external fibrillation consisting of fibrils tethered to fiber surfaces, in addition to loose fibrils and fines. Both contribute to a larger bonding area that increases paper strength, but tethered fibrils have less likelihood of being washed out during papermaking. This study postulates the mechanism by which refining produces external fibrillation and the optimum conditions for doing so. The postulated mechanism is surface abrasion during sliding of fibers in refiner gaps. External fibrillation occurs when forces are great enough to partially dislodge fibrils from fiber surfaces, but not large enough to break the fibrils. The refining intensities to achieve these forces were determined by a mathematical model and experiments using a laboratory disc refiner. The optimum intensities in terms of specific edge load (SEL) for chemical pulps were about 0.1 J/m for hardwoods and 1.0 J/m for softwoods An extension of this study suggested that abrasion may also account for most of the energy consumed in the mechanical pulping process.
Language:
English
Identifier:
ISSN: 0734-1415
EISSN: 0734-1415
DOI: 10.32964/TJ22.6.363
Source:
Alma/SFX Local Collection
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