Mode of wood fibre breakage during thermoplastic melt processing

Dickson, Alan R.; Sandquist, David

doi:10.1016/j.compositesa.2018.07.004

Cited by 11 publications

(10 citation statements)

References 44 publications

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“…Consistent with earlier report, 2 well executed compacting does not decrease average fiber length significantly, but enables adequate fiber feeding to the compounding process. 57 The increased refinability of bleached fibers can partially help to explain the fiber attrition process observed in our results. On the other hand, fiber width tends to remain relatively unchanged during melt processing.…”

Section: Effect Of Fiber Bleaching and Elo Treatment On Composite Permentioning

confidence: 58%

“…14,16 Wood fibers mainly fail in melt processing in a polymer matrix via lumen collapse, fiber buckling and subsequent fracturing. 57 The increased refinability of bleached fibers can partially help to explain the fiber attrition process observed in our results. During compacting, however, this process is not observed with only slight effect recorded for fiber length reduction and fines content generation for both bleached and unbleached fibers.…”

Section: Effect Of Fiber Bleaching and Elo Treatment On Composite Permentioning

confidence: 58%

“…It should be noted however, that FiberMaster analysis may make false interpretations of fiber width, as the fibers are no longer round but more flat due to collapse of lumen inside wood fiber walls caused by the fiber processing. 57 The results reveal that while both fiber types show a reduction in average fiber length during melt processing, bleached fibers show a higher degree of fines generation and fiber length reduction, and as ARTICLE WILEYONLINELIBRARY.COM/APP a consequence, a lower resulting aspect ratio. Bleached fibers are defined as having higher flexibility, with improved refinability, at the expense of fiber strength compared to unbleached fibers.…”

Section: Effect Of Fiber Bleaching and Elo Treatment On Composite Permentioning

confidence: 92%

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Influence of pulp bleaching and compatibilizer selection on performance of pulp fiber reinforced PLA biocomposites

Peltola

Immonen

Johansson

et al. 2019

J of Applied Polymer Sci

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This article focuses on the effect of pulp bleaching and emerging commercial compatibilizers on physical performance of pulp fiber reinforced poly(lactic acid) (PLA) biocomposites. Industrially bleached and unbleached hardwood kraft pulp fibers are treated with several additive types, and compounded with PLA to fiber content of 30 wt %. After injection molding, the produced biocomposites are evaluated by their mechanical performance and fiber-matrix adhesion. For selected materials, fiber surface and fiber properties are reflected to composite performance by analyzing the compositions, dimensions, and lignin coverage of original fibers, as well as fiber dispersion and dimensions after melt processing. As a conclusion, unbleached kraft pulp fibers provide significant improvement in physical properties of PLA/pulp fiber composites. Of the screened compatibilizers, epoxidated linseed oil has a clear positive effect on performance when bleached kraft pulp fibers are used. The improvements correspond to enhanced fiber-matrix adhesion and differences in remaining fiber length distributions.

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Section: Effect Of Fiber Bleaching and Elo Treatment On Composite Permentioning

confidence: 58%

Section: Effect Of Fiber Bleaching and Elo Treatment On Composite Permentioning

confidence: 58%

Section: Effect Of Fiber Bleaching and Elo Treatment On Composite Permentioning

confidence: 92%

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Influence of pulp bleaching and compatibilizer selection on performance of pulp fiber reinforced PLA biocomposites

Peltola

Immonen

Johansson

et al. 2019

J of Applied Polymer Sci

Self Cite

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“…MDF (medium density fibreboard) fibres are thermomechanical fibres where high temperatures around 170°C lead to cleavage of the fibres along the middle lamella, exposing a comparatively lignin-rich, nonpolar, fibre surface [6][7][8]. The typical MDF fibre from Pinus radiata is approximately 1.5 mm long and 34 μm wide, with an aspect ratio of 44/1 [9][10][11]. The large production plants devoted to MDF and the relatively low production cost of MDF fibre make it an attractive industrial choice as a filler for NFC.…”

Section: Introductionmentioning

confidence: 99%

Processing and Properties of MDF Fibre-Reinforced Biopolyesters with Chain Extender Additives

Thumm

Even²,

Gini

et al. 2018

International Journal of Polymer Science

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Biopolyesters are a way to improve natural fibre composite sustainability. This study explores, for the first time, the potential of using medium density fibreboard (MDF) fibres to reinforce four biobased and biodegradable polyester matrices to create a fully “green composite.” Added at 30 wt %, MDF fibres did not improve the strength of the injection moulded NFCs and this deficiency was investigated by measuring fibre length, viscosity, and molecular weight of the matrices. Compared to other lignocellulosic fibres, the use of MDF fibres led to a molecular weight reduction of biopolyesters during processing. This effect was particularly striking for PLA. The addition of a chain extender enhanced the molecular weight of PLA and improved its processability. The tensile strength increase was correlated to a reduction of fibre pull-out, enabling the MDF fibre to fulfil its expected reinforcement role within the biopolyester composite.

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“…From a material point of view, the reprocessing and reuse of recycled materials provide a great opportunity for producing new materials with comparatively enhanced properties. Nevertheless, several constraints have to be considered (e.g., thermal and oxidative degradation, polymer chain scission and decrease of molecular weight, wood particle/fibre degradation) towards using alternative material sources or exposing the material to several reprocessing cycles [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Recycled Material Sources for Wood-Polypropylene Composites: Effect on Internal Composite Structure, Particle Characteristics and Physico-Mechanical Properties

Krause

Sauerbier

Koddenberg

et al. 2018

Fibers

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In this study, various wood material sources were used for the manufacture of wood-polymer composites (WPC). The materials were categorised as virgin wood particles (VWP), reprocessed WPC particles (RWP) and recycled thermoset composite particles (RCP) and derived from two virgin wood sources, three-layer particleboards, medium-density fibreboards (MDF) boards, or two different wood/polypropylene composites. All produced wood-polypropylene compounds contained 60% wood material and were manufactured using a co-rotating extruder. Malleated polypropylene was used as a coupling agent. Specimens were injection moulded and subsequently tested for their physico-mechanical properties. To characterize particles before and after processing, dynamic image analysis (DIA) measurement were performed. Additionally, X-ray micro-computed tomography (XµCT) was used to characterize the internal structure of the composites and to verify the obtained particle’s characteristics. It was found that length and aspect ratio of particles were remarkably different before and after processing (loss in length of 15–70% and aspect ratio of 10–40%). Moreover, there were notably differences between the particle sources (RCP retained the highest length and aspect ratio values, followed by VWP and RWP). The results suggest that increased aspect ratios can indeed significantly improve mechanical properties (up to 300% increase in impact bending strength and 75% increase in tensile strength, comparing WPC based either on virgin spruce or MDF material). This phenomenon is suggested to be partially superimposed by improved dispersion of particles, which is expected due to lower variance and increased mechanical properties of RWP composites. However, no notable alterations were observed for composite density. Reprocessed WPC and, particularly, RCP material have proved to be an appealing raw material substitute for the manufacturing of wood–polymer composites.

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Mode of wood fibre breakage during thermoplastic melt processing

Cited by 11 publications

References 44 publications

Influence of pulp bleaching and compatibilizer selection on performance of pulp fiber reinforced PLA biocomposites

Influence of pulp bleaching and compatibilizer selection on performance of pulp fiber reinforced PLA biocomposites

Processing and Properties of MDF Fibre-Reinforced Biopolyesters with Chain Extender Additives

Utilization of Recycled Material Sources for Wood-Polypropylene Composites: Effect on Internal Composite Structure, Particle Characteristics and Physico-Mechanical Properties

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