Substantial Size Reduction of Banana Fibres and Enhancement of Fibre Properties Achieved Through a Single Mechanical Treatment View Full Text


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Article Info

DATE

2022-09-07

AUTHORS

P. D. Emrith, H. Ramasawmy, D. Surroop, D. B. Das

ABSTRACT

This study aims to encourage the large scale production of micro-cellulose fibres (MCF), especially in developing economies. Micro-fibres have been extracted from banana pseudo-stem agro-wastes to valorise the latter. The particularity of this study is that a commercial food wet grinder, an equipment necessitating less investment cost as compared to the traditional supermass colloider (SMC) machine, has been employed to yield micro-fibres. For enabling maximum controllability of the process, the effect of two grinding parameters (the gap distance and the number of passes) were investigated. The results revealed the viability of such a mechanical equipment: from SEM results, 95% reduction in fibre diameter (comparable to the 99% size reduction for the SMC machine) and from XRD results, high percentage crystallinity (76–80% corresponding to an increase of 25–30%) were obtained. The optimal conditions resulting in these conditions were: smallest possible gap distance (800 µm) and highest number of passes (30). Another singularity of this study is that the gap distance proved to be more important than the number of passes in terms of the fibre diameter reduction, lignin and hemicellulose reduction, crystallinity and fibrillation. Lignin and hemicellulose, despite having been decreased to 13% and 7–9% respectively during the process, have been observed to enhance fibrillation. Thus, a high degree of fibrillation (yielding micro-fibres of diameter 1–2 µm) was obtained at a relatively low power consumption (4.1 kWh/kg fibre). Finally, a detailed explanatory mechanism based on the literature-reported viscoelasticity of lignin has been given to explain how it facilitates fibrillation.Graphical AbstractGraphical abstract showing the outcomes of wet grinding of untreated banana fibres. More... »

PAGES

1-21

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    34 schema:description This study aims to encourage the large scale production of micro-cellulose fibres (MCF), especially in developing economies. Micro-fibres have been extracted from banana pseudo-stem agro-wastes to valorise the latter. The particularity of this study is that a commercial food wet grinder, an equipment necessitating less investment cost as compared to the traditional supermass colloider (SMC) machine, has been employed to yield micro-fibres. For enabling maximum controllability of the process, the effect of two grinding parameters (the gap distance and the number of passes) were investigated. The results revealed the viability of such a mechanical equipment: from SEM results, 95% reduction in fibre diameter (comparable to the 99% size reduction for the SMC machine) and from XRD results, high percentage crystallinity (76–80% corresponding to an increase of 25–30%) were obtained. The optimal conditions resulting in these conditions were: smallest possible gap distance (800 µm) and highest number of passes (30). Another singularity of this study is that the gap distance proved to be more important than the number of passes in terms of the fibre diameter reduction, lignin and hemicellulose reduction, crystallinity and fibrillation. Lignin and hemicellulose, despite having been decreased to 13% and 7–9% respectively during the process, have been observed to enhance fibrillation. Thus, a high degree of fibrillation (yielding micro-fibres of diameter 1–2 µm) was obtained at a relatively low power consumption (4.1 kWh/kg fibre). Finally, a detailed explanatory mechanism based on the literature-reported viscoelasticity of lignin has been given to explain how it facilitates fibrillation.Graphical AbstractGraphical abstract showing the outcomes of wet grinding of untreated banana fibres.
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    43 conditions
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    47 crystallinity
    48 degree
    49 diameter
    50 diameter reduction
    51 distance
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    57 fiber diameter
    58 fiber diameter reduction
    59 fiber properties
    60 fibers
    61 fibrillation
    62 gap distance
    63 grinder
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    65 high degree
    66 higher number
    67 higher percentage crystallinity
    68 investment costs
    69 large-scale production
    70 less investment costs
    71 lignin
    72 low power consumption
    73 machine
    74 maximum controllability
    75 mechanical equipment
    76 mechanical treatment
    77 mechanism
    78 micro-cellulose fibers
    79 number
    80 number of passes
    81 optimal conditions
    82 outcomes
    83 parameters
    84 particularities
    85 passes
    86 percentage crystallinity
    87 power consumption
    88 process
    89 production
    90 properties
    91 reduction
    92 results
    93 scale production
    94 singularity
    95 size reduction
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    98 terms
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    105 schema:name Substantial Size Reduction of Banana Fibres and Enhancement of Fibre Properties Achieved Through a Single Mechanical Treatment
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