Comparison of optical instruments for fines and filler characterisation

Hyll, Kari; Farahani, Farnaz; Mattsson, Lars

doi:10.3183/npprj-2017-32-01-p098-110

Cited by 1 publication

(2 citation statements)

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“…Fines cover several length scales (nm to μm) which relates to their rather arbitrary definition, namely, to pass a 200 mesh screen (that corresponds to holes with a diameter of 76 μm). , While the TAPPI definition considers the capability of fibrous matter to pass a mesh, in optical image analysis fines are classified according to the length of the particles. Particles having a length shorter than 200 μm are commonly referred to as fines . Therefore, simple structure–property relationships are challenging to establish, and the effect of the fines on the properties of paper, for instance, is still not fully understood. ,, While it is known that the fibrillar portion of the fines seems to increase mechanical strength of paper, higher fines contents in paper relate to more tedious dewatering procedures due to higher water retention values.…”

Section: Introductionmentioning

confidence: 99%

“…Particles having a length shorter than 200 μm are commonly referred to as fines. 18 Therefore, simple structure−property relationships are challenging to establish, and the effect of the fines on the properties of paper, for instance, is still not fully understood. 9,10,19 While it is known that the fibrillar portion of the fines seems to increase mechanical strength of paper, higher fines contents in paper relate to more tedious dewatering procedures due to higher water retention values.…”

Section: ■ Introductionmentioning

confidence: 99%

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Cobalt Ferrite Nanoparticles for Three-Dimensional Visualization of Micro- and Nanostructured Cellulose in Paper

Hobisch

Müller

Fischer

et al. 2019

ACS Appl. Nano Mater.

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Iron cobalt ferrite nanoparticles were used for the detection of micro- and nanostructured cellulose fibers in a cellulose network. Since extraction and modification of these fibers from lignocellulosic plants have undergone a significant increase in efficiency, nowadays composites containing these materials are a major research line in academia and industry. A particularly interesting composite in this context is paper, a nonwoven material where cellulose fibers form a network which is held together mainly by fiber–fiber interactions. In this composite, there is a certain fraction of micro- and nanostructured celluloses present, the so-called fines. Their impact on paper properties is still under debate, and one of the major factors influencing the properties, namely, their distribution inside the paper, remains elusive so far. Here, we present an approach which allows for the detection of these micro- and nanostructured celluloses in paper sheets by combining imaging technologies labeling the fine fibers with inorganic nanoparticles. The addition of these labeled materials during the paper manufacturing process enables imaging in scanning electron microscopy/energy-dispersive X-ray spectroscopy experiments and provides contrast in X-ray microtomography. Using a combination of these two techniques, the location of the fines in the paper sheets was evaluated and quantified, pointing at deposition in pores of the paper as well as at fiber–fiber junctions. We demonstrate that the tensile indices, air permeability, and the water retention value of handsheets were not altered by the addition of labeled fines compared to sheets where nonlabeled fines have been added.

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