Processing Parameters Influence on Disintegration Intensity of Technical Hemp Fibres

Advances in Materials Science and Engineering

Grāvītis

et al. 2013

Self Cite

A study of nanofibre composites obtained by electrospinning from poly(vinyl alcohol) (PVA) solutions of steam exploded hemp fibres and shives is reported. A combined treatment of steam explosion (SE), ball milling, and high-intensity ultrasound (HIUS) is applied to prepare cellulose nanofibres (CNF) from hemp fibres (CNF-F) and shives (CNF-S). The reflectance Fourier transform infrared (FTIR ATR) spectroscopy is used to analyze the obtained PVA/CNF composite mats. Morphology of the PVA/CNF composites was studied by scanning electron microscopy (SEM).

“…Hemp fibres and shives were treated using steam explosion treatment from previous researches [20,21], milling treatment, and high-intensity ultrasonication technique.…”

Section: Methodsmentioning

confidence: 99%

Nanofibre Electrospinning Poly(vinyl alcohol) and Cellulose Composite Mats Obtained by Use of a Cylindrical Electrode

Šutka

Advances in Materials Science and Engineering

Grāvītis

et al. 2013

Self Cite

“…The 4 wt% sodium hydroxide was used for one hour at 80 degrees as alkaline pretreatment to partially extract lignin, pectin and hemicelluloses, and separate the fiber bundles [7,8].…”

Section: B Alkaline Pretreatmentmentioning

confidence: 99%

Steam Explosion Impact to Technical Hemp Fiber Diameter

Grave

Putnina

et al. 2015

ETR

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Microfibers and nanofibers from natural products have high mechanical properties. For this reason researchers pay particular attention to the natural fibers and to the method how they are obtained. In the research samples with different treatments (alkaline pretreatment, steam explosion and water extraction) were investigated to evaluate treatment influence on fiber diameters. Fractionation does not provide actual results of fibers diameter as thinner fibers agglomerate to each other and around thicker fibers and cannot be sieved. Fiber diameter measurement with an optical microscope shows that pretreatment and treatment reduced the thickest fiber percentage and increase the number of fine particles. Dew-retted hemp gives 16% of thicker fibers and only 39% fibers with a diameters less than 63µm. 50% of alkaline pretreated and steam explosion treated fibers diameters are less than 63 µm and only 8% of diameters fall in range 160 - 630 µm.

“…The process is carried out for one hour at temperature 80 C 0 to defibrillate fibres and partially remove of hemicelluloses, lignin and pectin [9]. As post-processing method water and alkaline extraction was used by washing samples with boiling distilled water for three hours, followed by the treatment with 0,4 wt % NaOH solution [10] (Table I).…”

Section: B Pretreatmentmentioning

confidence: 99%

The Impact of Mechanical and Chemico-mechanical Treatment on Natural Fibre Dimensions

Grave

Šutka

et al. 2013

MSTCT

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Abstract. The Research aim is to find the most time and energy economic treatment of natural fibres to obtain micro and nanofibres. Alkaline treatment, steam explosion autohydrolysis and ultrasonic treatment effect on hemp fibres and shives dimensions were examined. Fibres length, diameter, form factor and sifting amount were analyzed. The results of the analysis show that an increase in treatment intensity gives a higher amount of fibres being noticeably shorter and thinner than the untreated dew-retted fibres. Fine content of fibres and shives increases, when treatment intensity increases.