Vpliv sestave lepilne mešanice na osnovi utekočinjenega lesa na kakovost lepljenja termično modificiranega lesa : diplomsko delo - visokošolski strokovni študij

Šilc, Janez (author), Šernek, Milan (mentor), Petrič, Marko (reviewer)

Proučevali smo vpliv sestave lepilne mešanice na osnovi utekočinjenega lesa na kakovost lepljenja termično modificiranega lesa. Ugotavljali smo tudi učinek modifikacije na nekatere mehanske in fizikalne lastnosti. S standardnimi metodami smo ugotovili strižno trdnost preizkušancev (SIST EN 392), modul elastičnosti, upogibno trdnost (SIST EN 408) in delaminacijo lepilnih spojev (SIST EN 391). Teste smo opravili s 3 slojnimi lepljenci iz nemodificirane in modificirane smrekovine, ki smo jih zlepili s 6 lepilnimi mešanicami. Za lepljenje smo uporabili melamin-urea-formaldehidno (MUF) lepilo in utekočinjen topolov les. Deleži utekočinjenega lesa v lepilni mešanici so bili 0 %, 5 %, 15 %, 25 %, 35 % in 50 %. Ugotovili smo, da je bila kakovost lepljenja modificiranega lesa odvisna od uporabljene lepilne mešanice. Z višanjem deleža utekočinjenega lesa v lepilni mešanici se je trdnost zmanjševala. Ugotovili smo tudi, da ima modificiran les manjšo upogibno trdnost v primerjavi z nemodificiranim lesom. Ravnovesna vlažnost modificiranega lesa v standardni klimi pa je bila v povprečju za 3,5 % niŽja od vlažnosti nemodificiranega lesa.

• Language: Slovenian
• Keywords: lepljenje, termična modifikacija lesa, utekočinjen les, mehanske lastnosti, MUF lepilo, delaminacija, upogibna trdnost, modul elastičnosti, strižna trdnost, lepilni spoji
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [J. Šilc]
• Year: 2011
• Number of pages: IX, 33 f., [13] f. pril.
• PID: 20.500.12556/RUL-603
• UDC: 630*824.81
• COBISS.SI-ID: 1956745
• Publication date in RUL: 11.07.2014

Secondary language

• Language: English
• Title: Influence of composition of adhesive mixture based on liquefied wood on the bonding performance of heat-treated wood : graduation thesis - higher professional studies

Abstract

Thesis researches the influence of composition of adhesive mixture based on liquefied wood on bonding quality of heat-treated wood. We observed the effect of modification on mechanical and physical performance of wood. Using standard methods we determined the shear strength of specimens (SIST EN 392), modulus of elasticity, modulus of rupture (SIST EN 408) and delamination (SIST EN 391). Tests were performed on heat-treated and non-treated 3-layer spruce laminations glued with 6 adhesive mixtures. We used MUF adhesive and poplar liquefied wood. 6 different shares of poplar liquefied wood: 0 %, 5 %, 15 %, 25 %, 35 % and 50 % in mixture were used. We found out that the quality of adhesive of heat-treated wood depended on usage of adhesive mixture. Higher the share of liquefied wood in adhesive mixture, lower the strength. We determined that heat-treated wood had lower modulus of rupture comparing to non-modified wood. Equilibrium moisture content of heat-treated wood in a standard climate was for 3.5 % lower from that of non-modified wood.

• Keywords: adhesive bonding, heat-treated wood, liquefied wood, mechanical properties, MUF adhesive, delamination, modulus of rupture, modulus of elasticity, shear strength of adhesive bond