Cellulosic fines: Properties and effects

Odabas, Nora; Henniges, Ute; Potthast, Antje; Rosenau, Thomas

doi:10.1016/j.pmatsci.2016.07.006

Cited by 56 publications

(32 citation statements)

References 71 publications

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“…The fines fraction is commonly either defined as material passing a 76 lm screen (200 mesh) in a Britt Dynamic Drainage Jar Device (according to SCAN-CM 66:05), or particles smaller than 200 lm in case of determination by automated optical analysis (according to ISO 16065-2) (Mayr et al 2017b). Depending on their origin, pulp fines have different morphological character and are usually divided in primary and secondary fines (Odabas et al 2016). Primary fines are produced during the pulping process and mainly consist of blocky or flake like material, which is mostly ray cells, parenchyma cells, pores and fragmental parts from the middle lamella (Odabas et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Depending on their origin, pulp fines have different morphological character and are usually divided in primary and secondary fines (Odabas et al 2016). Primary fines are produced during the pulping process and mainly consist of blocky or flake like material, which is mostly ray cells, parenchyma cells, pores and fragmental parts from the middle lamella (Odabas et al 2016). Secondary fines are generated during refining in the stock preparation process and have a strong fibrillar character, as they mainly consist of fibrils torn from the fibre wall structure during pulp refining (Retulainen et al 1993).…”

Section: Introductionmentioning

confidence: 99%

“…Due to their different morphological character, primary and secondary fines have a different effect on sheet properties. As the mainly fibrillar material of the secondary fines shows higher surface area and stronger swelling, it has a stronger effect on bonded area and therefore a stronger influence on strength properties of paper compared to the more blocky primary fines (Ferreira et al 2000;Fischer et al 2017;Mayr et al 2017a, b;Motamedian et al 2019;Odabas et al 2016). Still, also fine cellulosic materials defined as secondary fines can differ in their fibrillar material content, respectively their fibrillar area (Mayr et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Softwood kraft pulp fines: application and impact on specific refining energy and strength properties

Mandlez

Zangl-Jagiello²,

Eckhart

et al. 2020

Cellulose

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Along with the emergence of micro and nanofibrillated celluloses and their application in papermaking, the influence of the so called fines fraction of pulps on both process and product properties has received increasing research interest in recent years. Several researchers have experimented with primary and/or secondary pulp fines to assess their effects on paper properties with not always consistent results. Our work focuses on the targeted application of the primary fines fraction of an unbleached softwood kraft pulp. The primary fines are separated from the pulp to be subsequently added to achieve blends of $$5\%, 9\%$$ 5 % , 9 % and $$12\%$$ 12 % primary fines content. These blends were then refined in a PFI mill to evaluate the effect of the primary fines on refining as well as on paper properties of hand sheets prepared from these pulps. It is shown that the addition of primary fines enhances tensile strength in the unrefined and slightly refined state, while the maximum tensile strength of the highly refined reference pulp is not increased. A slightly increased dewatering resistance (Schopper Riegler) at comparable air permeability (Gurley) for a given tensile strength was also observed. The linear relationship between tensile index and apparent sheet density seems to be affected in the unrefined and slightly refined state where the breaking length of the fines enriched samples is higher for a given apparent density.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Softwood kraft pulp fines: application and impact on specific refining energy and strength properties

Mandlez

Zangl-Jagiello²,

Eckhart

et al. 2020

Cellulose

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show abstract

“…Primary fines feature lower bonding ability compared to the more fibrillar secondary fines and affect the optical properties of the resulting papers. The following refining process generates up to 40% highly fibrillar secondary fines (Odabas et al 2016). The secondary fines induce strong swelling and have a significant positive effect on mechanical strength by increasing the density of the final product while reducing air permeability.…”

Section: Introductionmentioning

confidence: 99%

“…Although, primary and secondary fines exhibit a dominating morphology, both contain fiber segments or vice versa fibrillar parts to a lower extent (Mayr et al 2017a). Summing up, fines in paper affect several paper properties such as shrinkage potential, sheet density and air permeability as well as mechanical properties (Odabas et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Localization of cellulosic fines in paper via fluorescent labeling

Hobisch¹,

Bossu²,

Mandlez³

et al. 2019

Cellulose

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Generated in the pulp and paper production process, cellulosic pulp fines are fibrous cellulosic materials capable of passing a 200 mesh screen. Processed pulp fines remain in the pulp and affect pulp and paper sheet properties. Their specific morphology promotes interactions with fibers and alters sheet properties. Nevertheless, the 3D distribution of fines in paper sheets has not been revealed so far. Localizing fines within a matrix of fibers is challenging since both elements have the same chemical composition and fines have small dimensions. It is required to increase the contrast of pulp fines, while avoiding any alteration of initial fines morphology. In this study, fines were first separated and labeled with Rhodamine B isothiocyanate, a fluorescent dye. Labeled fines were blended with pulp at different concentrations and paper sheets were produced from each mixture. Prior to imaging, pulps and handsheets were characterized by standard pulp and paper tests and compared with references, showing no significant differences between sheets containing labeled and untreated fines. Thus, mechanical and physical tests indicated that no, or only minor alteration of fines properties by the labeling process occurred. We then applied two imaging techniques to detect the labeled pulp fines in the paper network, namely confocal laser scanning microscopy and multiphoton microscopy, visualizing the 3D distribution of fluorescent fines within the fiber network. The results obtained also allowed a differentiation between morphologically different fines showing fiber fragments more attached to single fibers whereas more fibrillar fines concentrate in fiber-fiber joints, thereby strengthening bonding.

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Moisture‐Driven Actuators

Tang,

Zhao,

Liu

et al. 2024

Adv Funct Materials

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Water constitutes a huge circulation network in solid, liquid and gaseous forms that contains inestimable recyclable energy. Obtaining energy from gaseous moisture is challenging but of great significance to promote the energy upgrading. The emergence of moisture‐driven actuator (MDA) provides an effective way in converting moisture energy to mechanical energy. The MDA can combine with water molecules through hygroscopicity and swell to produce macroscopic deformation. Due to the wide distribution of humidity and the wireless driving mode, MDA shows great application potential in the fields of environmental monitoring, remote control and energy harvesting. This paper comprehensively reviews the research progress of MDA from aspects of hydrophilic materials, structures, preparing methods, multi‐response integration and applications, aiming at providing guidance for the design, preparation and application of MDA. Besides, the challenges faced by MDA are analyzed and corresponding solutions are proposed, which points out the next stage developing direction of MDA.

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Cellulosic fines: Properties and effects

Cited by 56 publications

References 71 publications

Softwood kraft pulp fines: application and impact on specific refining energy and strength properties

Softwood kraft pulp fines: application and impact on specific refining energy and strength properties

Localization of cellulosic fines in paper via fluorescent labeling

Moisture‐Driven Actuators

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