The effect of MFC on the pressability and paper properties of TMP and GCC based sheets

Hii, Collin; Gregersen, Øyvind Weiby; Chinga-Carrasco, Gary; Eriksen, Øyvind

doi:10.3183/npprj-2012-27-02-p388-396

Cited by 85 publications

(54 citation statements)

References 20 publications

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“…(Chen et al 2013;Hii et al 2012;Koskenhely et al 2005). As swelling is influenced by structural changes and pulp chemistry, the effect of different pulp treatments can be monitored by its characterization and thus swelling yields important information regarding, e.g., dewaterability on the paper machine or strength development after sheet consolidation.…”

Section: Introductionmentioning

confidence: 99%

A novel approach to determining the contribution of the fiber and fines fraction to the water retention value (WRV) of chemical and mechanical pulps

Mayr

Eckhart

Winter³

et al. 2017

Cellulose

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The swelling behavior of pulp fibers has a significant influence on process and product properties. The water uptake of fibers is controlled by a different mechanism. While fiber charge is a driving factor for swelling, the swelling is hindered by the solid structure of the fiber wall. In the case of the fines fraction of pulps, this structure is broken to some extent and the fines are able to swell two to three times more compared to fibers. Thus fines are an important factor regarding the swelling behavior and water retention of pulps, although, at least for chemical pulp, their mass fraction is only between 4 and 15%. For this reason, it is of interest to investigate not just the swelling behavior of pulps, but also of the fiber and fines fractions separately. Swelling is often characterized using the water retention value (WRV) based on a centrifugation technique. WRV measurement is a standardized method for the measurement of the amount of water retained in a given pulp sample. For fine cellulosic materials the standardized procedure cannot be performed. Thus, various modifications of the standard method have been applied by different groups for the evaluation of these materials. Due to these modifications the values obtained cannot be related to the standardized method. In this work a novel approach to determining the WRV of the fines fraction in a given pulp based on the standard procedure will be presented. This allows a quantitative investigation of the contribution of the fibers and fines fraction to the WRV of any given pulp sample.

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Section: Introductionmentioning

confidence: 99%

A novel approach to determining the contribution of the fiber and fines fraction to the water retention value (WRV) of chemical and mechanical pulps

Mayr

Eckhart

Winter³

et al. 2017

Cellulose

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“…There have been several trials involving the use of nanocellulose as a strength additive (Nakagaito, Yano 2005;Ahola et al 2008, Eriksen et al 2008Nakagaito et al 2009;Taipale et al 2010;Zimmermann et al 2010;Sehaqui et al 2011;Hii et al 2012;Sehaqui et al 2013). Eriksen et al (2008) highlighted that, by blending 4% of bleached kraft pulp MFC with TMP fibre furnish, this improved the tensile index and air resistance.…”

mentioning

confidence: 99%

“…Eriksen et al (2008) highlighted that, by blending 4% of bleached kraft pulp MFC with TMP fibre furnish, this improved the tensile index and air resistance. Taipale et al (2010) and Hii et al (2012) blended MFC with pulp suspension and noticed an increase in paper strength and a decrease in pulp dewatering. Spence et al (2010) have produced TMP-based nanocellulose and have noticed that it was difficult to extract well individualized fibrils from TMP, and, they reported an average fibre diameter within the micron scale.…”

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confidence: 99%

Paper strength improvement by inclusion of nano-lignocellulose to Chemi-thermomechanical pulp

Osong

Norgren

Engstrand

2014

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY: So far, chemical pulp fibres have been utilized as conventional stock materials for nanocellulose production. The main aim of this work is to use stock materials from mechanical or chemi-thermomechanical pulping process to produce lignin containing nanofibres, which are referred to as nano-ligno-cellulose (NLC) in this study. The present study shows the influence on handsheets of chemi-thermomechanical pulp (CTMP) fibres blended with NLC. For comparison reasons, nanocellulose (NC) from bleached kraft pulp (BKP) was produced in a similar approach as NLC. Both the NLC and the NC were blended with their respective pulp fibres and their corresponding handsheets properties were evaluated with respect to sheet density. It was found that the handsheets of pulp fibres blended with NLC/NC improved the mechanical properties of handsheets with only a slight effect in relation to the sheet density. Improvements in strength properties of handsheets such as z-strength, tensile index, tear index, burst index, Emodulus, strain at break, tensile stiffness, air resistance were observed.

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“…The negative effects of CNF on drainage 55) and on press dewatering have been the subject of particular attention in the literature 56,57) , even though it has been claimed that papers containing CNF are easily dewatered using a single-nip shoe-press. 58) It is noted that the effects of CNF additions on paper properties have been reviewed 59,60) and a representative sample of investigations have been collected in Table 1.…”

Section: Concrete Applicationsmentioning

confidence: 99%

Large Scale Applications of Nanocellulosic Materials : A Comprehensive Review

Lindström¹,

Naderi²,

Wiberg³

2015

J. of Korea TAPPI

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The common production methods of nanocellulosic (cellulosic nanofibrils, CNF) materials from wood are being reviewed, together with large scale applications and particularly papermaking applications. The high energy demand for producing CNF has been one particular problem, which has been addressed over the years and can now be considered solved. Another problem was the clogging of homogenizers/microfluidizers, and the different routes to decrease the energy demand. The clogging tendency, related to the flocculation tendency of fibres is discussed in some detail. The most common methods to decrease the energy demand are TEMPO-oxidation, carboxymethylation and mechanical/enzymatic pre-treatments in the order of increased energy demand for delamination. The rheology characteristics of CNF materials, i.e. the high shear viscosity, shear thinning and the thixotropic properties are being illuminated.CNF materials are strength adjuvants that enhance the relative bonded area in paper sheets and, hence increase the sheet density and give an increased strength of the paper, particularly for chemical pulps. At the same time papers obtain a lower light scattering, higher hygroexpansion and decreased air permeability, similar to the effects of beating pulps. The negative effects on drainage by CNF materials must be alleviated through the appropriate use of microparticulate drainage aids. The use of CNF in films and coatings is interesting because CNF films and coatings can provide paper/board with good oxygen barrier properties, particularly at low relative humidities. Some other high volume applications such as concrete, oil recovery applications, automotive body applications and plastic packaging are also briefly discussed.

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The effect of MFC on the pressability and paper properties of TMP and GCC based sheets

Cited by 85 publications

References 20 publications

A novel approach to determining the contribution of the fiber and fines fraction to the water retention value (WRV) of chemical and mechanical pulps

A novel approach to determining the contribution of the fiber and fines fraction to the water retention value (WRV) of chemical and mechanical pulps

Paper strength improvement by inclusion of nano-lignocellulose to Chemi-thermomechanical pulp

Large Scale Applications of Nanocellulosic Materials : A Comprehensive Review

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