The effect of microfibrillated cellulose addition on drying shrinkage and dimensional stability of wood-free paper

Manninen, Marjo; Kajanto, Isko; Happonen, Juha; Paltakari, Jouni

doi:10.3183/npprj-2011-26-03-p297-305

Cited by 36 publications

(19 citation statements)

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“…Similar correlations have also been found in other studies (Fahey, Chilson 1963;Manninen et al 2011). Nordman stated, however, that in simulations of machine direction conditions by the uniaxial stretching of strips, the linear relationship no longer holds.…”

Section: Relationship Between Drying Shrinkage and Hygroexpansivitysupporting

confidence: 78%

Hygroexpansivity of anisotropic sheets

Erkkila¹

2015

30 (2) 2015

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Section: Relationship Between Drying Shrinkage and Hygroexpansivitysupporting

confidence: 78%

Hygroexpansivity of anisotropic sheets

Erkkila¹

2015

30 (2) 2015

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“…The effect was less pronounced for restraint-dried sheets. The fineness of the additive did not have a major influence [24].…”

Section: Pulp Fractions and Hornificationmentioning

confidence: 99%

“…The paper sheets are placed on the scanner and ideally weighed down in order to flatten the sample. After scanning the samples at different humidities, the dimensions can be measured and the expansion calculated [24]. Digital correlation techniques are also used to monitor sheet hygroexpansion [25].…”

Section: Measurement Of Single Fiber and Paper Sheet Hygroexpansionmentioning

confidence: 99%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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Paper is a widely used packaging material and is nowadays regaining importance, e.g., as bio-based and biodegradable material. Moreover, new technologies such as polymer-fiber composites, printed electronics and the deep drawing of paper are developing. The process stability and also the resulting quality of paper converting processes such as coating, metallization, printing, and the printing of electronics are highly affected by the hygroexpansion of paper. In order to reduce production instability and to choose and develop paper substrates with ideal characteristics, critical parameters need to be known. This paper offers an extensive overview of those parameters, starting at a molecular and microscopic level with the effect of the constituents and morphology of single fibers, before moving on to paper contents, chemical modifications and additives and finally concluding with paper production and fiber network modification. It was found that the major influences are single fiber sorption, inter-fiber contacts, microfibril angle, fiber morphology (length, width, curliness) and fiber orientation. This review gives new ideas and insights for technologists working in research, development and production optimization of paper-based products.

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“…Finally, it is interesting to note that CNF materials also impose a strong effect on drying shrinkage 64) resulting in a high strain to failure for freely dried papers.…”

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 microfibrillated cellulose addition on drying shrinkage and dimensional stability of wood-free paper

Cited by 36 publications

References 0 publications

Hygroexpansivity of anisotropic sheets

Hygroexpansivity of anisotropic sheets

Factors affecting the hygroexpansion of paper

Large Scale Applications of Nanocellulosic Materials : A Comprehensive Review

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