Characterisations of fibre networks in paper using micro computed tomography images

Wernersson, Erik; Borodulina, Svetlana; Kulachenko, Artem; Borgefors, Gunilla

doi:10.3183/npprj-2014-29-03-p468-475

Cited by 20 publications

(15 citation statements)

References 28 publications

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“…Despite the advantages in terms of resolution of acquisition of synchrotron CT, conventional CT set‐up is widely used and constantly improved. It was in fact used among others by Wernersson et al, Sharma et al, Miettinen et al, and Saxena et al…”

Section: Introductionmentioning

confidence: 99%

Moulded pulp products manufacturing with thermoforming

Didone

Tosello

2018

Packag Technol Sci

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Over the past years, eco‐friendly packaging solutions such as moulded pulp have resonated with a growing number of consumers. Among all of them, the thermoformed products make use of the most recent manufacturing approach that produces high‐quality, thin‐walled items. However, it remains an underresearched area, and the development of an efficient and precise manufacturing process is fundamental in order to increase the implementation of sustainable packaging. With the purpose of setting a step towards in the standardization of design and testing practices of eco‐friendly packaging, this work focused on the characterization of the thermoforming process of moulded pulp products and their characteristics. Three different analyses were carried out for this purpose, covering the dewatering efficiency of the process, a quantification of the moulding geometrical accuracy, and an analysis of the internal microstructure of the parts. Experimental results and statistical analysis show that the dewatering efficiency is mainly governed by the mould's temperature while the duration of the contact time is not influential. In the second investigation, the geometrical accuracy of the mouldability of microfeatures was assessed. The process appeared to be dependently related to the pulp type employed. Finally, the internal microstructure was documented using X‐ray computed tomography. The analysis shows an increase in the internal void fraction linked with an increase in the mould's temperature. The role of the water change of phase in the thermoforming process is also discussed by reference to the work conducted on impulse drying.

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Section: Introductionmentioning

confidence: 99%

Moulded pulp products manufacturing with thermoforming

Didone

Tosello

2018

Packag Technol Sci

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“…Meanwhile, the latest measurement techniques enable fibers to be pulled from the fiber network to determine the strength with which it is anchored to the sheet structure (Saketi and Kallio 2011). Another possibility to get a deeper look inside the paper structure is the X-ray synchrotron radiation tomography (Latil et al 2010;Marulier et al 2012Marulier et al , 2015Wernersson et al 2014). This technique enables researcher to get a 3D-image from the fiber network that might help in the future to get more valid information about fiber contact points and their bonding mechanism.…”

Section: Measurement Techniquesmentioning

confidence: 99%

Initial wet web strength of paper

Belle

Odermatt

2016

Cellulose

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Despite much research into and development within the complex area of the initial wet web strength of paper, no complete model has yet been developed to describe this property. This type of paper strength is the most important property to ensure an effective paper machine run. Furthermore, the process of strength development in the sheet forming and pressing portion of the process is the basis of the final paper strength. Recent investigations have focused on the surface interactions of fibers on the molecular level. There have also been several innovative findings about fiber swelling and the impact of swelling on the mechanical characteristics of fibers in wet conditions. Overall, progress obtained using new methodologies enables a deeper understanding of the mechanism of strength development. This review discusses these important areas by examining the literature and the authors' own work to obtain a better understanding of the strength development in wet paper webs. This paper highlights that the fiber morphology and the dryness of the wet web have the greatest impact on the strength of the wet web. As fiber sources and machinery are fixed, the fiber water gel is one of the easiest factors to adjust via the process water quality and the use of chemical additives.

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“…Marked fiber centerlines are the only measure required for the automated post-processing methods presented in the first part of our work . Representation of the sample in terms of a few basic measurements allows us to demonstrate the fiber distribution in space, as illustrated in In the visualization, each fiber is defined by a fiber axis and the median of its inner and outer radii and shown as hollow cylinders of constant radii, based on Wernersson et al (2014).…”

Section: Measured Characteristic Propertiesmentioning

confidence: 99%

“…In the calculation procedure, the distance between the fibers is estimated as the distance between the outer surfaces of the fibers (fiber cell walls) (for details see Wernersson et al, 2014). We evaluated the shortest distance d between the pair of fibers crossing in-plane.…”

Section: Distance Between the Fibers Crossing In-planementioning

confidence: 99%

“…A number of partially and fully automated methods have been proposed (Dokládal, Jeulin, 2009;Marulier et al, 2012;Wernersson et al, 2009;Viguié et al, 2013;Yamakawa, Chinga-Carrasco, 2010). Previously, we presented the methods of describing the internal characteristics of fiber networks in paper using X-ray tomography, adapted for estimation of the number of bonds in paper (see Wernersson et al, 2014). In that work, we developed a fast semi-automatic method for extracting important properties from 3D micro-computed tomography (µCT) images of sparse handsheets.…”

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confidence: 99%

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Extracting fiber and network connectivity data using microtomography images of paper

Borodulina¹,

Wernersson

Kulachenko³

et al. 2016

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY:We apply image analysis methods based on micro-computed tomography (µCT) to extract the parameters that characterize the structure and bonding parameters in the fiber network of paper. The scaling and variational properties of µCT images are examined by analyzing paper structural properties of two 1 × 1 mm2 test pieces, which have been cut out from a low-grammage handsheet. We demonstrate the applicability of the methods for extracting the free fiber length, fiber cross-sectional data, the distances between the fibers, and the number of fiber-to-fiber bonds, which are the key properties required for the adequate representation of the network in numerical models. We compare the extracted connectivity data with the early reported analytical estimations and conclude that the number of contacts in three-dimensional networks is controlled by the fiber aspect ratio. In addition, we compare the cross-sectional data with those measured by the fiber morphology characterization tools and estimate the fiber shrinkage from completely wet to dry state to be nearly 20%. ADDRESSES OF THE AUTHORS: Svetlana Borodulina(svebor@kth.se), Artem Kulachenko (artem@kth.se): KTH,

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Characterisations of fibre networks in paper using micro computed tomography images

Cited by 20 publications

References 28 publications

Moulded pulp products manufacturing with thermoforming

Moulded pulp products manufacturing with thermoforming

Initial wet web strength of paper

Extracting fiber and network connectivity data using microtomography images of paper

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