Effects of pulp freezing and frozen pulp storage on fibre characteristics

Kibblewhite, R. P.

doi:10.1007/bf00584043

Cited by 5 publications

(9 citation statements)

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“…In experiments about the effect of freezing on pulp properties, Kibblewhite determined that the IWWS decreases as the drying rate increases (Kibblewhite 1980). Similar to other research work, this study argues that the increased fiber rigidity/hornification leads to a reduction in bonding intensity.…”

Section: Hornificationsupporting

confidence: 82%

“…The status DG = 0 might be valid before sheet forming and is therefore strongly depending of process water quality and used additives. Dewatering and the corresponding approach of the fibers and fibrils is responsible for interfering the fiber water gel and for the intermediate fiber-fiber bonds (Kibblewhite 1973;Wågberg and Annergren 1997).…”

Section: Fiber Water Gel On the Fiber Surfacementioning

confidence: 99%

“…The degree of beating enhances or lessens this effect (Brecht and Erfurt 1959b;Kibblewhite 1973;Lindqvist et al 2011;Salminen 2010). All authors cited above conclude that proper swelling increases the dry strength of the paper.…”

Section: Fiber Swellingmentioning

confidence: 99%

“…In addition to studies that describe the influence of beating on dewatering and strength (Berger and Schramm 2011;da Silva et al 1982;Kibblewhite 1973;Lindqvist 2013;Lindqvist et al 2011Lindqvist et al , 2012Lindström and Kolman 1982;Pikulik 1997), there is an extensive body of research papers on dewatering chemicals and the use of mineral fillers (Alince et al 2006;de Oliveira et al 2009;Esser et al 2008;Gärdlund et al 2003;Hua et al 2011;Lindqvist et al 2009;Pikulik 2000;Sutman 2011;Szeiffova and Alince 2003). Furthermore, the sheet structure and the fiber orientation is largely determined by the condition in the headbox and forming section.…”

Section: Sheet Formingmentioning

confidence: 99%

“…In this phase, the gel formation in the proximity of the fibers is an important parameter affecting the formation of contact points (Kibblewhite 1973;McKenzie 1984;Voyutskij 1963b;Wågberg and Annergren 1997). These forces are supported by the diffusion of polymer chains of dissolved cellulose on the fiber surface and by wood polysaccharides, particularly xylan (Casey 1960;Clark 1978a;McKenzie 1984;Pelton 1993).…”

Section: Integral Explanatory Modelsmentioning

confidence: 99%

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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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Section: Hornificationsupporting

confidence: 82%

Section: Fiber Water Gel On the Fiber Surfacementioning

confidence: 99%

Section: Fiber Swellingmentioning

confidence: 99%

Section: Sheet Formingmentioning

confidence: 99%

Section: Integral Explanatory Modelsmentioning

confidence: 99%

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Initial wet web strength of paper

Belle

Odermatt

2016

Cellulose

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Advantages of prefreezing for reducing shrinkage-related degrade in eucalypts: General considerations and review of the literature

Ilic

1995

Wood Sci.Technol.

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Summary Difficulties associated with the drying of ash eucalypts including collapse and internal checking, are discussed briefly. Prefreezing is one method that has been used successfully as a pretreatment for the drying of both hardwoods and softwoods from temperate and tropical regions.Prefreezing has produced marked reductions in shrinkage, collapse and drying degrade of the heartwood in the following species: California redwood, black walnut, black cherry, tanoak, toon, bamboo, and eucalypts. Little or no collapse reduction has been observed in New Zealand red beech, Pacific madrone, white birch, sitka spruce, and white ash. Limited response has been observed for numerous other species notably red oak and white oak.Reduced drying time in response to prefreezing has been observed in jarrah, karri, black walnut, Asian oak, toon, and California redwood; in Pacific madrone and tanoak the drying time increased. Not all species which respond with a reduction in shrinkage show reduced drying rates.Prefreezing wood at -20 ~ appears to be the most practicable temperature, although some species respond better at lower temperatures. However, in all cases, it is critical to ensure that the wood freezes and remains frozen for a number of hours. Indications are that the effect is retained for days to weeks and that the length of time of freezing need not exceed 12-24 hours.A number of explanations have been put forward to explain the behaviour of prefrozen wood. It is suggested that the main mechanism responsible for reduced shrinkage is due to the migration of moisture from the cell wall onto frozen lumen water. The moisture loss from the cell wall produces a 'cold shrinkage'; water to ice transformation leads to an expansion of liquid water in the lumen, thus imparting a compressive stress to the cell wall, which together with the moisture loss, make the cell more rigid, and therefore likely to shrink less. There is some evidence that certain types of wood extractives migrate into the cell wall during freezing and may play a role in the reinforcement of the wall. Reduced shrinkage after prefreezing has also been attributed to a reduction of the plasticising effect of wood extractives in wood dried at higher temperatures and low humidities; this effect does not occur at low temperatures.

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The effect of method of preservation of forages on their resistance to reduction in particle size with an artificial masticator

McLeod

Wilson

1989

Animal Feed Science and Technology

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Effects of pulp freezing and frozen pulp storage on fibre characteristics

Cited by 5 publications

References 0 publications

Initial wet web strength of paper

Initial wet web strength of paper

Advantages of prefreezing for reducing shrinkage-related degrade in eucalypts: General considerations and review of the literature

The effect of method of preservation of forages on their resistance to reduction in particle size with an artificial masticator

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