The role of fiber entanglement in the strength of wet papers

Oliveira, Marcius H. de; Marić, Milan; Ven, Theo G. M. van de

doi:10.3183/npprj-2008-23-04-p426-431

Cited by 18 publications

(16 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This web implanted among the pulp fibres contributes to the mechanical properties of paper (Bardet and Bras, 2014). De Oliveira et al (2008) compared the effect of flexible CNFs and rigid glass fibres. An increase in the solid content of CNFs resulted in entanglement friction between CNFs and pulp fibres.…”

Section: Semi-crystalline Structurementioning

confidence: 99%

Role of Cellulose Nanofibrils in Improving the Strength Properties of Papers: A Review

Jele

Lekha²,

Sitholé

2021

Preprint

View full text Add to dashboard Cite

The pursuit for sustainability in the papermaking industry calls for the elimination or reduction of synthetic additives and the exploration of renewable and biodegradable alternatives. Cellulose nanofibrils (CNFs), due to their inherent morphological and biochemical properties, are an excellent alternative to synthetic additives. These properties enable CNFs to improve the mechanical, functional and barrier properties of different types of paper. The nanosize diameter, micrometre length, semi-crystalline structure, high strength and modulus of CNFs has a direct influence on the mechanical properties of paper such as tensile index, burst index, Scott index, breaking length, tear index, Z-strength, E-modulus, strain at break, and tensile stiffness. This review details the role played by CNFs as an additive to improve strength properties of papers and the factors affecting the improvement in paper quality when CNFs are added as additives. The paper also includes techno-economic aspects of the process and identifies areas that need further research.

show abstract

Section: Semi-crystalline Structurementioning

confidence: 99%

Role of Cellulose Nanofibrils in Improving the Strength Properties of Papers: A Review

Jele

Lekha²,

Sitholé

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…These forces develop in the structure due to progressive dewatering and result in frictional connection and entanglement (Belle et al 2014a;Kallmes et al 1977;Kendall 2001a;Williams 1983). With further dewatering, the fibers progressively collapse (Belle et al 2015a;Paavilainen 1993a, b;, with the result that the macroscopic and mechanical interlocking and felting of fibers increases the entanglement and frictional connections (de Oliveira et al 2008;Tejado and van de Ven 2009;Williams 1983). Rigid, smooth fibers are best suited for this phase of strength development, as they support the capillary forces and interlocking at large distances between fibers (Belle et al 2014a).…”

Section: Integral Explanatory Modelsmentioning

confidence: 99%

“…Besides drainage pressure and suction in the wire section the capillary forces are acting for the fiber and fibril approach, and as a result are a major factor affecting the IWWS in the early stages of paper dewatering (Campbell 1933;Israelachvili 2006a;Kendall 2001b;Page 1993;Persson et al 2013;Rance 1980;Schubert 1982;van de Ven 2008;Williams 1983). The capillarity describes the properties of liquids in narrow spaces.…”

Section: Capillary Forcesmentioning

confidence: 99%

“…In additional papers, the bonds in wet sheets were explained based on a gel-like surface of the fiber (de Oliveira et al 2008;Lindqvist et al 2013;McKenzie 1984;Myllytie 2009). …”

Section: Fiber Water Gel On the Fiber Surfacementioning

confidence: 99%

“…The ''fiber saturation point'' (FSP) has been used to characterize the water adsorption and swelling properties (Christensen and Giertz 1965;Scallan and Tigerström 1992;Scallan 1977;Stone and Scallan 1967;Tejado and van de Ven 2010;van de Ven 2008). An additional method of determining the swelling state is to measure the water retention value (Höpner et al 1955;Thode et al 1960;Zellcheming 1957).…”

Section: Fiber Swellingmentioning

confidence: 99%

See 2 more Smart Citations

Initial wet web strength of paper

Belle

Odermatt

2016

Cellulose

View full text Add to dashboard Cite

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.

show abstract