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Kato, Kazushige; Cameron, Ruth E.

doi:10.1023/a:1009292120151

Cited by 159 publications

(58 citation statements)

References 24 publications

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“…As these surfaces absorb less water, the initial volume and softness cannot be recovered. This process is also considered as ''hornification'' [164,165]. Accordingly, there is a linear correlation between the water retention value and the degree of hornification [166].…”

Section: Pulp Fractions and Hornificationmentioning

confidence: 99%

“…Accordingly, there is a linear correlation between the water retention value and the degree of hornification [166]. A detailed insight into the chemical processes during hornification has been given [165,167]. The collapsing of the fiber and the reduction in water absorbance leads to a decrease in hygroexpansion when such hornified fibers are added to the pulp.…”

Section: Pulp Fractions and Hornificationmentioning

confidence: 99%

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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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Section: Pulp Fractions and Hornificationmentioning

confidence: 99%

Section: Pulp Fractions and Hornificationmentioning

confidence: 99%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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“…The ageing of cellulose in paper has been extensively investigated in applications such as archiving of books (Wilson and Parks 1979) and the recycling of paper (Hubbe et al 2007). Books or other archived paper, produced under acid conditions, may deteriorate rapidly through the acid hydrolysis of the cellulose (Kato and Cameron 1999). In paper recycling, the repeated drying and rewetting cycles lead to a decrease in the swelling ability of chemical pulp fibres.…”

Section: Introductionmentioning

confidence: 99%

Chemical and ultrastructural changes in cotton cellulose induced by laundering and textile use

et al. 2014

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The textile industry is currently under pressure to decrease environmental load related to both the manufacture and the use of textiles. Material recycling may be one of many ways to accomplish such a decrease. Age-induced property changes in cotton textiles are important to understand in order to facilitate the recycling of cotton textiles. Consequently, this study investigates ultrastructural and chemical changes that take place in the cellulose of cotton sheets over a long time period of use and laundering. Ultrastructural changes were studied using water retention value (WRV), specific surface area measurement, scanning electron microscopy and solid state NMR spectroscopy. Chemical changes through measurement of intrinsic viscosity with and without reductive treatment, molecular mass distribution and carboxylate group content. A substantial decrease in mass average molecular mass from 1,320 to 151 kDa was observed when subjecting the sheets to more than 50 launderings. In contrast, only small differences in WRV, in fibril dimensions and crystallinity estimated using solid state NMR spectra, were observed between sheets laundered 2-4 times and more than 50 times. On one hand, the combination of minor laundering effects of WRV and solid state NMR spectra, together with the large decrease in molecular mass are positive indications for the possibility of recycling cotton into regenerated cellulosic fibres. On the other hand, results show that the specific surface area decreased, which implies that the reactivity of cotton cellulose may decrease during long-term use and laundering.

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“…Comparable improved strength values as a result of heat impact have been reported also previously (Vainio and Paulapuro 2007;Vänskä and Vuorinen 2015;Vänskä et al 2015). This strength development is explained with the crosslinking and the hornification of fibers upon temperature increase (Kato and Cameron 1999;Pönni et al 2012). Thermal Yellowing Color coordinates have been introduced to quantify the discoloration caused by the thermal degradation of fibers (Chen et al 2012).…”

Section: Effect Of Pretreatments On Strength Properties Of Handsheetsmentioning

confidence: 99%

Addition of Ascorbic Acid or Purified Kraft Lignin in Pulp Refining: Effects on Chemical Characteristics, Handsheet Properties, and Thermal Stability

Vänskä¹,

Vihelä²,

Johansson³

et al. 2016

BioResources

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The effects of two pulp pretreatments, impregnation with ascorbic acid (AA) or purified kraft lignin (KL), on bleached pulp refining were investigated by examining and testing handsheets made from these pulps. The AA pretreatment of the pulp amplified the depolymerization of the cellulose and notably impaired the strength properties of the pulp handsheets. The effects were enhanced upon the combination of the AA pretreatment and intensive refining. Furthermore, heat treatments (at 225 °C, 30 min, in water vapor atmospheres of 1 and 75% (v/v)) promoted the depolymerization of cellulose and the total color difference in the AA impregnated handsheets more than for the KL impregnated and reference handsheets. In contrast to AA, the KL pretreatment of the pulp improved the burst index stability of the refined pulp handsheets after the humid thermal treatment (75% (v/v)). In addition, the total color difference of the KL impregnated handsheets was lower than the AA impregnated and reference handsheets.

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Untitled

Cited by 159 publications

References 24 publications

Factors affecting the hygroexpansion of paper

Factors affecting the hygroexpansion of paper

Chemical and ultrastructural changes in cotton cellulose induced by laundering and textile use

Addition of Ascorbic Acid or Purified Kraft Lignin in Pulp Refining: Effects on Chemical Characteristics, Handsheet Properties, and Thermal Stability

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