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Nordic Pulp & Paper Research Journal

The international research journal on sustainable utilization of forest bioresources

Editor-in-Chief: Lindström, Tom

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Volume 27, Issue 2


Application and interpretation of zero and short-span testing on nanofibre sheet materials

Swambabu Varanasi / Hui Hui Chiam / Warren Batchelor
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  • Australian Pulp and Paper Institute, Department of Chemical Engineering, Monash University, Monash, Australia
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Published Online: 2018-11-09 | DOI: https://doi.org/10.3183/npprj-2012-27-02-p343-351


This paper investigates the use of zerospan testing to measure the tensile strength of cellulose nanofibre sheets. The mechanical strength of cellulose nanofibre paper is a key property but tensile strength measurement requires a substantial amount test material, whereas a zero/short span test needs much less material. Sheets made from cellulose nanofibres, microfibrillated cellulose (MFC) and northern bleached softwood fibres were tested at spans ranging from 0 to 0.6 mm and tensile strength spans of 50 and 100 mm. For the cellulose nanofibres or the MFC sheets, strength was constant with span from 0 to 0.6 mm when tested dry and negligible when tested wet, except at zero span. The sheets made from the softwood fibres showed significant strength when tested wet at all spans from 0 to 0.6 mm. The results showed that for nanofibre materials, the zero or short span strength is measuring sheet tensile strength at a smaller sample length. The strength of the nanofibre sheets at 50 or 100 mm was smaller than at zero/short span due to sample size effects and Poisson contraction. The effects of starch and grammage on strength were also studied.

Keywords: Weibull analysis; Fracture surfaces; SEM; Fibre dimensions; Residual span; Zero span tensile test

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Published Online: 2018-11-09

Published in Print: 2012-05-01

Citation Information: Nordic Pulp & Paper Research Journal, Volume 27, Issue 2, Pages 343–351, ISSN (Online) 2000-0669, ISSN (Print) 0283-2631, DOI: https://doi.org/10.3183/npprj-2012-27-02-p343-351.

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