Porosity of swollen pulp fibers revisited

Alinče, B.

doi:10.3183/npprj-2002-17-01-p071-073

Cited by 42 publications

(45 citation statements)

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“…Within this structure, in a water-swollen state, there are also pores and voids of different sizes. Water is mainly accessible to the voids between the microfibrils and to the hemicelluloses (Alince 2002). The cell wall can be regarded as a hydrogel, the cohesive force of which is not crosslinking but the hierarchical structure of the cell wall.…”

Section: The Structure Of a Cellulose Microfibrilmentioning

confidence: 99%

Proposed Nano-Scale Coalescence of Cellulose in Chemical Pulp Fibers During Technical Treatments

Pönni¹,

Vuorinen²

2012

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This review summarizes the proposed mechanisms for irreversible coalescence of cellulose microfibrils within fibers during various common industrial treatments for chemical pulp fibers as well as the methods to evaluate it. It is a phenomenon vital for cellulose accessibility but still under considerable debate. The proposed coalescence mechanisms include irreversible hydrogen bonding. Coalescence is induced by high temperature and by the absence of obstructing molecules, such as water, hemicelluloses, and lignin. The typical industrial processes, in the course of which nano-scale coalescence and possible aggregation of cellulose microfibrillar elements occurs, are drying and chemical pulping. Coalescence reduces cellulose accessibility and therefore, in several instances, the quality of cellulose as a raw material for novel products. The degree of coalescence also affects the processing and the quality of the products. For traditional paper-based products, the loss of strength properties is a major disadvantage. Some properties lost during coalescence can be restored to a certain extent by, e.g., beating. Several factors, such as charge, have an influence on the intensity of the coalescence. The evaluation of the phenomenon is commonly conducted by water retention value measurements. Other techniques, such as deuteration combined with FTIR spectroscopy, are being applied for better understanding of the changes in cellulose accessibility.

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Section: The Structure Of a Cellulose Microfibrilmentioning

confidence: 99%

Proposed Nano-Scale Coalescence of Cellulose in Chemical Pulp Fibers During Technical Treatments

Pönni¹,

Vuorinen²

2012

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“…However, only 60-70% of the cellulose in cell wall layers exists in a crystalline form. Thirty to forty percent is amorphous and affected by water molecules [72]. Kocherbitov et al evaluated the hydration of microcrystalline cellulose (cellulose I and II) and amorphous cellulose.…”

Section: Hygroexpansion Of Cellulosementioning

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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“…In the last few decades, the pore structure of the fiber walls has received a considerable amount of research attention (Kerr and Goring 1975;Suumaki et al 1997;Alince and van de Ven 1997;Berthold 1997;Selenius and Lindström 1997;Hubbe et al 2007;Sjöstedt 2014). This is appropriate because the "geometry" of pores in the fiber walls (i.e., size, shape, and arrangement) influences many aspects of fiber behavior.…”

Section: Introductionmentioning

confidence: 99%

Effects of Modified Cooking on Fiber Wall Structure of E. globulus and E. nitens

Antes

Joutsimo²

2015

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This work examined the impact of SuperBatch™ (SB), CompactCooking™ (CC), and Lo-Solids™ (LS) modified kraft pulping on the fiber wall structure of unbleached and bleached unrefined pulps of E. globulus and E. nitens. The kappa number target for all pulps was 17 ± 0.5. It was found that E. nitens had higher water retention values (WRVs) and fiber saturation point (FSP) for both bleached and unbleached pulps versus E. globulus. Fibril lateral aggregates width of unbleached pulps increased as WRV increased. After bleaching there was an inverse trend in correlation of WRV versus the lateral fibril aggregate width. The modified cooking methods or wood species did not have an influence on lateral fibril aggregate width. The higher WRV and FSP values for E. nitens were not reflected in the cumulative pore volume measurements including pore widths below 216 nm.

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Porosity of swollen pulp fibers revisited

Cited by 42 publications

References 0 publications

Proposed Nano-Scale Coalescence of Cellulose in Chemical Pulp Fibers During Technical Treatments

Proposed Nano-Scale Coalescence of Cellulose in Chemical Pulp Fibers During Technical Treatments

Factors affecting the hygroexpansion of paper

Effects of Modified Cooking on Fiber Wall Structure of E. globulus and E. nitens

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