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Lahke plošče iz konoplje : diplomski projekt
ID Dobravec, Vid (Author), ID Medved, Sergej (Mentor) More about this mentor... This link opens in a new window, ID Šernek, Milan (Reviewer)

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Abstract
Zaradi vse večjega trenda uporabe naravnih materialov iz obnovljivih virov se poraba kompozitov na osnovi naravnih vlaken z leta v leto povečuje. Vlakneni kompoziti se uporabljajo v industrijah pohištva, notranje opreme in izolacijskih plošč. Poleg lesa, kot osnovnega gradnika različnih kompozitov se v zadnjem času, kot potencialna surovina za izdelavo vlaknatih in ivernih kompozitov omenja tudi konoplja. Konoplja je hitrorastoča rastlina, ki uspeva skoraj v vseh delih sveta. Steblo vsebuje veliko pezdirja in enega najmočnejših naravnih vlaken z veliko vsebnostjo celuloze. V raziskavi smo želeli ugotoviti možnost uporabe konoplje za izdelavo iverno-vlaknatega ploščnega kompozita. Izdelali smo 6 plošč in sicer štiri plošče 5 mm (enoslojne in trisojne) in 2 plošči 16 mm (enoslojna in trislojna) in sicer samo iz pezdirja ter kombinacije pezdirja in vlaken. Uporabili smo melamin-urea formaldehidno lepilo. Preizkušancem smo določali: vsebnost vlage, gostoto, debelinski in rezidualni nabrek, upogibno trdnost, modul elastičnosti, razslojno trdnost in koeficient toplotne prevodnosti. Ugotovili smo, da lahko iz konopljinih vlaken in pezdirja izdelamo plošče nizkih gostot. Dodajanje dolgih vlaken je ploščam zelo izboljšalo mehanske lastnosti, medtem ko je uporaba manjših (pomletih) gradnikov dosegla ravno nasproten učinek. Vse izdelane plošče so dosegle zadovoljive vrednosti toplotne prevodnosti. Glavna pomanjkljivost plošč ja majhna odpornost proti delovanju vlage.

Language:Slovenian
Keywords:konopljina vlakna, pezdir, sejalna analiza, vlaknene plošče, spring-back efekt, vsebnost vlage, gostota, upogibna trdnost, razslojna trdnost, sprememba dimenzij ob povišani vlažnosti
Work type:Diploma project paper
Typology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Place of publishing:Ljubljana
Publisher:V. Dobravec
Year:2016
Number of pages:VIII, 26 f.
PID:20.500.12556/RUL-158791 This link opens in a new window
UDC:630*862.3
COBISS.SI-ID:2621321 This link opens in a new window
Publication date in RUL:20.06.2024
Views:200
Downloads:23
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Secondary language

Language:English
Title:Low density hemp fibreboards : B. Sc. thesis
Abstract:
Due to the increasing trend of usage of natural materials from renewable sources, the use of composites based panels made from natural fibres is increasing every year. Fibre composites are used for furniture, interior design and insulation panels. In addition to wood as the basic constituent of various composites in recent times, hemp is mentioned as a potential raw material for the manufacture of fibre and particle composites. Hemp is a fast growing plant that grows in almost all parts of the world. The stem contains hurd and one of the strongest natural fibres with a high content of cellulose. The study was to determine the possibility of using hemp for the manufacture of particle-fibre composite panel. Four panels thickness 5 mm (single-layer and three-layer) and 2 panels with thickness 16 mm (single-layer and three-layer) using nly hurd and/or fibre were made in laboratory conditions. We used a melamine-urea-formaldehyde adhesive. We determined moisture content, density, thickness and residual swelling, bending strength, modulus of elasticity, internal bond, and thermal conductivity. We were able to produce a low density boards using hurd and/or fibres. Measurements have shown that adding long fibres to the surface of the panels inproves mechanical properties. Panels in which we used refined constituents bending strength decreased. All panels have had low of thermal conductivity. The main drawback of the panels is their low resistance against the high humidity.

Keywords:hemp fiber, woody core, sieve analysis, hemp fiber board, spring-back efect, moisture content, dimension change at increased humidity, density, flexural strength, residual swels, thermal conductivity

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