Dolžinsko lepljenje sveže smrekovine : diplomsko delo - visokošolski strokovni študij

Lauko, Simon (author), Šernek, Milan (mentor), Šega, Bogdan (reviewer)

Raziskovali smo trdnostne lastnosti dolžinsko spojene smrekovine (Picea abies Karst). Pripravili smo smrekove lamele z različno vlažnostjo in jih razvrstili v 3 vlažnostne razrede. V prvem so bile lamele z vlažnostjo okoli 46 %, v drugem 30 % in v tretjem 10 %. Lamele smo prežagali na pol in jih ponovno spojili s pomočjo zobatega spoja. Za lepljenje smo uporabili enokomponentno poliuretansko lepilo MITOPUR E20, ki ga proizvaja podjetje Mitol iz Sežane. Lepljence smo obdelali na dimenzije kot zahteva standard DIN 52 186, preseka 20 mm x 20 mm ter dolžine 470 mm. V sušilniku smo jih posušili na vlažnost okoli 14 %. Preizkuse smo izvajali na napravi za testiranje mehanskih lastnosti Zwick Z100. Ugotavljali smo modul elastičnosti in upogibno trdnost. Ugotovili smo, da je bilo izbrano lepilo primerno za spajanje mokre oziroma vlažne smrekovine. Upogibna trdnost je padala z naraščajočo vlažnostjo lesa pri lepljenju. Vrednosti modula elastičnosti pa so naraščale. Najbolj ugodne rezultate smo dobili pri lepljenju smrekovine z vlažnostjo 10 %.

• Language: Slovenian
• Keywords: les, kompoziti, lepljenje, mehanske lastnosti, smrekovina, vlažnost lesa
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [S. Lauko]
• Year: 2010
• Number of pages: X, 41 f., [14] f. pril.
• PID: 20.500.12556/RUL-524
• UDC: 630*824.86
• COBISS.SI-ID: 1818249
• Publication date in RUL: 11.07.2014

Secondary language

• Language: English
• Title: Finger jointing of green spruce : graduation thesis - higher professional studies

Abstract

Strength properties of longitudinally glued spruce wood (Picea abies Karst) were researched using a toothed adhesive layer and spruce wood of different moisture. We took several lamellas of spruce wood and sort them into 3 moisture groups. The first group contained lamellas with high percentage of moisture 46 %, the second group 30 %, and the third 10%. We sawed lamellas into halves and then glued them back together with assistance of finger joint and one - component polyurethane glue, MITOPUR E20 produced by Mitol from Sežana. Afterwards we processed glued lamellas into dimensions demanded by DIN 52 186, cross- section 20 * 20 mm and length 470 mm. We dried the processed lamellas in a drier to moisture of 14 %. Our tests were performed at Biotechnical faculty on Zwick Z100 machine, used for testing mechanical characteristics. Modulus of elasticity and bending strength demanded by DIN 52186 were tested. We came to conclusion that the glue we used was appropriate for gluing wet or humid spruce wood. By increasing the moisture of wood the modulus of elasticity was increasing and bending strength was decreasing. The best results we came across were at the moisture of 10 %.

• Keywords: wood, composites, gluing, mechanical properties, spruce wood, moisture content