Dataset Information

Pulp Fines-Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose.

ABSTRACT: In the pulp and paper industry different types of pulp or fiber fines are generated during the pulping (primary fines, mechanical fines), and/or the refining process (secondary fines). Besides fibers, these cellulosic microparticles are a further component of the paper network. Fines, which are defined as the fraction of pulp that is able to pass through a mesh screen or a perforated plate having a hole diameter of 76 ?m, are known to influence the properties of the final paper product. To better understand the effect and properties of this material, fines have to be separated from the pulp and investigated as an independent material. In the present study, fines are isolated from the pulp fraction by means of a laboratory pressure screen. To allow for further processing, the solids content of the produced fines suspension was increased using dissolved air flotation. Morphological properties of different types of fines and other cellulosic microparticles, such as microfibrillated celluloses (MFC) are determined and compared to each other. Furthermore, handsheets are prepared from these materials and properties, such as apparent density, contact angle, modulus of elasticity, and strain are measured giving similar results for the analyzed types of fines in comparison to the tested MFC grades. The analysis of the properties of fiber fines contributes on the one hand to a better understanding of how these materials influences the final paper products, and on the other hand, helps in identifying other potential applications of this material.

SUBMITTER: Fischer WJ

PROVIDER: S-EPMC6418736 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

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Pulp Fines-Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose.

Fischer Wolfgang Johann WJ Mayr Melanie M Spirk Stefan S Reishofer David D Jagiello Lukas Andreas LA Schmiedt Romana R Colson Jerome J Zankel Armin A Bauer Wolfgang W

Polymers 20170817 8

In the pulp and paper industry different types of pulp or fiber fines are generated during the pulping (primary fines, mechanical fines), and/or the refining process (secondary fines). Besides fibers, these cellulosic microparticles are a further component of the paper network. Fines, which are defined as the fraction of pulp that is able to pass through a mesh screen or a perforated plate having a hole diameter of 76 μm, are known to influence the properties of the final paper product. To bette ...[more]

PMID: 30971045

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Project description:In this research article, wood based microfibrillated cellulose (MFC) was studied to gain a better understanding of the process of dependent network formation. Networking potential and obtained properties of the produced dimensional structures could be controlled using opted processing routes. The fabricated dimensional structure, using freeze-drying (FD) is a highly open and porous network (98% porosity) compared to slightly tight, dense and less porous network produced after pressing at 200kN (96% porosity), followed by vacuum-filtered (VF) networks (33% porosity). The porosity (17%) was further decreased when the casting (CS) method was used, further producing a highly dense and compressed network. High water flux (180.8?±?11?L/m2h) of pressed freeze-dried (PFD) followed by vacuum-filtered (VF) (11.4?±?1.9?L/m2h) and casting CS (0.7?±?0.01?L/m2h) were calculated using device. Furthermore, increased water flux (1.4 fold) of Experimental Paper Machine (XPM) based structures was reported in comparison with CS structures. Pore-sized distribution and surface area were measured using Hg porosimetry; they showed an average pore size of 16.5 ?m for FD, followed by PFD (8.2 ?m) structures. A 27-fold decrease in average pore-size was observed for CS structure in comparison with the FD structures. Highest tensile strength (87?±?21?MPa) was recorded for CS structures, indicating a more highly compacted network formation compared to VF (82?±?19?MPa) and PFD (1.6?±?0.06?MPa). Furthermore, an attempt was made to upscale the VF structures using traditional paper making approach on XMP. Improved tensile strength (73?±?11?MPa) in machine produced structures is due to alignment of fibers towards machine direction compared to cross directional (43?±?9?MPa) fractured structures as shown in our Scanning Electron Microscopy (SEM) analysis. Surface functionalization of MFC using enzyme (hexokinase) was performed to increase the adsorption efficiency towards ferric ions removal. All fabricated structures were further evaluated for Fe(iii) removal and it was summarized that charge densities of functional groups, produced ?-potential and networking potential were dominating influential factors for adsorption fluctuation of ferric ions.

Dataset Information

Pulp Fines-Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose.

Publications

Pulp Fines-Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose.

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