Physical Properties of Latvian Hemp Fibres

Abstract

Each year more and more people focus on healthy, ecological and environmental-friendly living. Environmentally friendly lifestyle doesn’t mean that we are using only natural products, but attention is pointed to the manufacturing and production process also. The rapid development of recycled and biodegradable products causes expanding usage of hemp fibers both in household and technical textiles. The analysis of hemp cultivation and usage trends in the world and Europe shows that hemp cultivation and processing in Latvia has good perspectives. Product quality is influenced by raw materials. In this case it is hemp fiber descriptive characteristics. Hemp fibers are natural fibers and their properties varies according to plant growing regional climatic conditions, amount of manure, plant density, harvesting time and pre-treatment technological processes. There are studied the influence of above mentioned factors on chemical composition, geometrical and physical properties of the Latvian hemp fiber both local and foreign cultivars. The work was carried out in cooperation between Riga Technical University, Textile Technology and Design Institute and the Agriculture Science Centre of Latgale.

Influence of pectinase enzyme Beisol PRO on hemp fibres retting

“…The rough green hemp stalks sort "Purini" were obtained from Agriculture Science Centre of Latgale, Latvia (harvest -autumn 2012) [14].…”

Revitalization of Industrial Hemp Cannabis sativa L. var. sativa in Slovenia: a Study of Green Hemp Fibres

“…Retting facilitates the extraction of bast fi bres from stems, but it usually causes the deterioration of textile fi bres' mechanical properties [47]. In our study, the following properties of green hemp fi bres extracted mechanically from non-retted stems were determined: analysed varieties except Bialobrzeskie had a -comparable stem height and quantity of green fibres, but they diff ered in volume density, which was for Novosadska only 27.5 kg/m 3 , but for Beniko, it amounted to 218 kg/m 3 ; analysed green hemp fi bres diff ered in content -of ash, but Unico B and Novosadska deviated in lower content of pectin and water soluble substances; average linear density of green hemp fi bres was -very high, around 200 tex; tenacity of fi bres' bundles was comparable with -literature [42], i.e. between 167 MPa (Bialobrzeskie) and 272 MPa (Juso-11); tenacity of elementary fi bres was between 548 -MPa (Beniko) and 672 MPa (Bialobrzeskie), which is typical for hemp elementary fi bres; curves of specifi c stress-strain of fi bres from all -fi ve varieties are similar, which means that fibres from diff erent varieties have similar superstructure.…”

“…Tekstilec, 2017, 60(1), [36][37][38][39][40][41][42][43][44][45][46][47][48] By using genetic engineering, the diversity of varieties has increased signifi cantly which infl uences the authorized varieties that change all the time. Th is puts the farmers and processors in front of a number of issues regarding the suitability of cultivation in a given territory and yield of plants.…”

“…Hemp fi bres consist of cellulose (74-78%), hemicellulose (4-20%), lignin (2-11%), water and solvent soluble substances, wax, ash, pectin, protein and water [42]. Th e content of water-soluble substances of absolutely dry green hemp fi bres (Tab.…”

Optimal Processing of Flax and Hemp Fibre Nonwovens

“…Unfortunately, the harvesting time of fibre harvest differs from the harvesting time of seed harvest. Generally, in the time of fibre harvesting, seeds are not fully ripe, and conversely, in the time of seed harvesting, fibres are overripe and do not have the best mechanical properties (Mediavilla et al 1998;Baltina et al 2011). Thus, hemp and flax plants can be grown either for fibres, or for seeds.…”