Advanced Decortication Technology for Unretted Bast Fibres

Munder, Friedrich; Fürll, Christian; Hempel, Heinz

doi:10.1300/j395v01n01_04

Cited by 19 publications

(8 citation statements)

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“…The number of times the material was passed through the scutcher ensured that the shive content remaining on the fibre was below the maximum acceptable level (0 . 02) for most industrial applications (Munder et al 2004). All scutching and hackling work was conducted in a controlled environment room at 21 xC and 65 % RH, and all samples were conditioned in this environment for at least 48 h before processing.…”

Section: Methodsmentioning

confidence: 99%

Agronomic evaluation and performance of flax varieties for industrial fibre production

Dimmock

Bennett²,

Wright

et al. 2005

J. Agric. Sci.

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Flax fibre for industrial purposes differs from that for linen production, although the agronomic factors that influence fibre development and which factors are most important for industrial fibre production have still to be defined. A description of variations in the performance of fibre flax varieties is also necessary as current guidance relates to the European market rather than the UK. Field trials were sown in 2002 and 2003 at the Henfaes Research Centre in north Wales, investigating 29 and 26 varieties, respectively, of European fibre flax and dual-purpose flax varieties. In 2002 a nitrogen treatment was included in the trial with two treatments, 40 kg/ha and 80 kg/ha. Varieties were evaluated for 20 agronomic and fibre production variables, and the differences between the varieties were analysed using analysis of variance (ANOVA) and principal components analysis (PCA). The higher nitrogen rate was found to increase crop lodging, although some varieties were found to be more susceptible than others. Environment had a strong influence on crop success, with some varieties showing more year to year stability than others. PCA allowed those varieties that were the highest yielding, highest fibre producers and showed the best stability across the 2 years to be identified. Understanding the agronomic results presented and discussed here is important if fibre flax production is to become economically viable in the UK.

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Section: Methodsmentioning

confidence: 99%

Agronomic evaluation and performance of flax varieties for industrial fibre production

Dimmock

Bennett²,

Wright

et al. 2005

J. Agric. Sci.

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“…Chemical and mechanical decortications are usually followed to treat retted materials. Chemical methods usually produce cleaner fibers, but cause concerns regarding environmental pollutions and safety issues during manufacturing [29,30,31]. Mechanical methods such as toothed breaking rollers have been used to decorticate bast fibers from raw plants such as hemp, flax, and linseed [27,28].…”

Section: Isolation Of Nanocellulose From Natural Plantsmentioning

confidence: 99%

“…However, mechanical methods usually require dry and well-retted straws for the decortication process and may break the long fibers [27,28]. The advantage and disadvantages of various decorticate methods can be found in other reviews [29,30,31,32,33]. The developed bast fibers can be further processed to yield nanocellulose, as discussed in the following sections.…”

Section: Isolation Of Nanocellulose From Natural Plantsmentioning

confidence: 99%

Nanocellulose-Based Conductive Membranes for Free-Standing Supercapacitors: A Review

Hsu

Zhong

2019

Membranes

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There is currently strong demand for the development of advanced energy storage devices with inexpensive, flexibility, lightweight, and eco-friendly materials. Cellulose is considered as a suitable material that has the potential to meet the requirements of the advanced energy storage devices. Specifically, nanocellulose has been shown to be an environmentally friendly material that has low density and high specific strength, Young’s modulus, and surface-to-volume ratio compared to synthetic materials. Furthermore, it can be isolated from a variety of plants through several simple and rapid methods. Cellulose-based conductive composite membranes can be assembled into supercapacitors to achieve free-standing, lightweight, and flexible energy storage devices. Therefore, they have attracted extensive research interest for the development of small-size wearable devices, implantable sensors, and smart skin. Various conductive materials can be loaded onto nanocellulose substrates to endow or enhance the electrochemical performance of supercapacitors by taking advantage of the high loading capacity of nanocellulose membranes for brittle conductive materials. Several factors can impact the electronic performance of a nanocellulose-based supercapacitor, such as the methods of loading conductive materials and the types of conductive materials, as will be discussed in this review.

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“…One of the common screening machines is vibratory separator (Parvin et al 2013), and it has been adopted in separation of hemp materials. Münder et al (2004) use a vibratory separator to eliminate chaff from long fibres. Pecenka and Furll (2008) have reported a vibratory separator with oscillating comb for fibre cleaning.…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Modeling of Hemp Particle Separation Using a 3D Vibratory Separator.

Sadek¹,

Chen²

2013

Can. Biosyst. Eng.

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Sadek, M.A., and Y. Chen. 2013. Discrete Element Modeling of Hemp Particle Separation Using a 3D Vibratory Separator. Canadian Biosystems Engineering/Le génie des biosystèmes au Canada 55: 2.23-2.31. Existing cleaning equipment was ineffective for cleaning processed hemp material (a mixture of fibre, core, and chaff). One of the major obstacles was the lack of the knowledge on the cleaning process. In this study, a 3D vibratory separator (screen-type) was experimentally studied for cleaning processed hemp material through separating chaffs (small particles) from the other particles (larger particles) in a mixture. In the experiment, the separation efficiency of the 3D vibratory separator was measured for different horizontal and vertical vibratory settings of the separator. Results showed that the separation efficiency varied from 23 to 86%, depending on the vibratory settings. The low separation efficiency was due to the fact that chaff was held within the entangled fibre, which prevented chaff from passing through the screen. A numerical model was developed to simulate the 3D vibratory separator using the discrete element method (DEM). The main model components included virtual particles of processed hemp material as well as a virtual 3D vibratory separator. The model is able to deal with mixtures of different particle sizes and different portions of fibre, core, and chaff particles, and predict the separation rates and efficiencies of the 3D vibratory separator. When compared with the measured separation rate, the simulated separation rate was higher towards the end of separation processes due to inexistence of fibre tangle problem in the virtual hemp particles. However, the trend of simulated values could adequately explain that of the measurements. Keywords: Hemp, separation, vibratory shaker, discrete element method, simulation. Les équipements de nettoyage qui sont sur le marché sont inefficaces pour le nettoyage du chanvre récolté (un mélange de fibres, tiges et balle). Un des obstacles majeurs vient du manque de connaissance du processus de nettoyage. Dans cette étude, un crible vibrant 3D (tamis) a été testé pour nettoyer du chanvre récolté en séparant la balle (petites particules) des autres particules (grosses particules) du mélange. Dans l'expérience, l'efficacité de séparation du crible a été mesurée pour différents ajustements verticaux et horizontaux. Les résultats ont montré que l'efficacité de séparation variait entre 26 et 86 % selon le niveau de vibration. L'efficacité de séparation la plus faible était obtenue lorsque la balle était enchevêtrée à la fibre ce qui empêchait la balle de passer à travers le tamis. La méthode des éléments discrets (DEM) a été utilisée pour développer un modèle numérique qui simule le crible vibrant 3D. Les principaux éléments du modèle incluent des particules virtuelles de chanvre récolté et un crible vibrant 3D virtuel. Le modèle peut tenir compte de mélanges de différentes tailles de particules et de différentes proportions de fibre, tiges et balle, et prédire l...

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Advanced Decortication Technology for Unretted Bast Fibres

Cited by 19 publications

References 0 publications

Agronomic evaluation and performance of flax varieties for industrial fibre production

Agronomic evaluation and performance of flax varieties for industrial fibre production

Nanocellulose-Based Conductive Membranes for Free-Standing Supercapacitors: A Review

Discrete Element Modeling of Hemp Particle Separation Using a 3D Vibratory Separator.

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