Primerjava lastnosti različnih vrst konopljenih vlaken

Petretić, Sharon (author), Rijavec, Tatjana (mentor), Kocjan Ačko, Darja (comentor)

V diplomskem delu je bil raziskan vpliv časa žetve (julij/september) na donosnost stebel navadne konoplje za sorte Antal, KC Dora, Kompoltni hibrid TC, Santhica 27, Tiborszallasi, Tisza in USO 31. Na izbrani sorti Tiborszallasi z visokim donosom stebel smo preučili vpliv godenja v vodi pri sobni temperaturi na kakovost konopljenih vlaken. Za uspešno godena stebla je zadoščalo šest dni za stebla, požeta v septembru 2018 in vsaj dvanajst dni za stebla, požeta v avgustu 2017. Z analizo konopljenih stebel smo ugotovili, da so konopljena stebla med 17./18. avgustom 2017 in 28./29. septembrom 2017, tj. v 43. dneh, pridobila na masi v povprečju za 37,5 %, na dolžini v povprečju za 4,01 % ter, na debelini ob vznožju stebel za 17,9 %. Kot najbolj donosni sorti sta izstopali sorti Antal in Tiborszallasi, požeti v septembru. Godenje konopljenih stebel sorte Tiborszallasi, požetih v septembru 2018 je potekalo hitreje od godenja stebel, požetih v avgustu 2017. Vlakna, izločena iz stebel, požetih v avgustu 2017 so bila finejša in nižje trdnosti od vlaken, izločenih iz stebel, požetih konec septembra 2018. Godenje v vodi do 28 dni je vplivalo na znižanje dolžinske mase, pretržne sile in modula elastičnosti ter na zvišanje pretržnega raztezka konopljenih vlaken. Godenje ni pomembno vplivalo na spremembo specifične pretržne napetosti konopljenih vlaken.

• Language: Slovenian
• Keywords: hemp, Cannabis sativa, čas žetve konoplje, godenje v vodi
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2020
• PID: 20.500.12556/RUL-123337
• Publication date in RUL: 19.12.2020

Secondary language

• Language: English
• Title: Comparison of different hemp fibre properties

Abstract

The diploma thesis the influence of harvest time (July/September) on the stems yield of Cannabis sativa for varieties Antal, KC Dora, Kompoltni hibrid TC, Santhica 27, Tiborszallasi, Tisza and USO 31 was studied. On the selected variety Tiborszallasi with high yield of stems was explored an influence of retting in water at room temperature on the quality of hemp fibres. Six days for stems harvested in September 2018 and at least twelve days for stems harvested in August 2017 were sufficient for successfully grown hemp stems. By analysing hemp stems, it was found that stems harvested between 17./18. August 2017 and 28./29. September 2017, i.e. in 43 days, gained in weight by an average of 37.5%, in length by an average of 4.01%, in thickness at the base of the stems by 17.9%. The varieties Antal and Tiborszallasi, harvested in September were the most profitable varieties. Retting of hemp stems of the Tiborszallasi variety harvested in September 2018 was faster than of stems harvested in August 2017. Fibres extracted from stems harvested in August 2017 were finer, with lower strength than fibres extracted from stems harvested at the end of September 2018. Retting in water for up to 28 days had the effect of reducing the length mass, tensile force and modulus of elasticity, and increasing the tensile elongation of hemp fibres. Retting did not significantly influence on the specific breaking stress of hemp fibres.

• Keywords: hemp, Cannabis sativa, hemp harvesting time, retting in water