Mehanske in fungicidne lastnosti vezanih plošč zaščitenih s Silvanolinom

diplomsko delo - visokošolski strokovni študij

Jože Bajuk (Author), Franc Pohleven (Reviewer), Milan Šernek (Mentor)

Abstract

Zaščitno sredstvo Silvanolin dobro zaščiti les pred škodljivci, ni pa znano, kako zaščiti vezan les in kako vpliva na lepilo ter lepljenje. Zato smo se odločili, da impregniramo furnirje s Silvanolinom in jih zlepimo v plošče, ter ugotovimo vpliv zaščite na mehanske in fungicidne lastnosti. Furnirje smo impregnirali v vakuumsko tlačni komori. Lepili smo z melamin-urea-formaldehidnim lepilom Meldur H97 v visokofrekvenčni stiskalnici. Preizkus mehanskih lastnosti smo izvajali s pomočjo univerzalnega testirnega stroja Zwick Z100 po standardu SIST EN 314 za strižno trdnost in SIST EN 310 za modul elastičnosti in upogibno trdnost. Gostoto smo ugotavljali po standardu SIST EN 323, vlažnost pa po SIST EN 322. Pri fungicidnih lastnostih smo imeli impregnirane vzorce, neimpregnirane vzorce in pa vzorce iz masivnega lesa bukve za kontrolo. Tako smo vse 3 vzorce izpostavili 3 glivam razkrojevalkam (beli hišni gobi, pisani ploskocevki in ogljeni kroglici) za 16 tednov v rastni komori v skladu s standardom SIST EN 113. Ugotovili smo, da so mehanske lastnosti zaščitenih vzorcev nekoliko boljše od nezaščitenih. Pri merjenju vlažnosti smo ugotovili, da imajo zaščiteni vzorci višjo vlažnost od nezaščitenih. Tudi gostota zaščitenih je bila večja. Pri ugotavljanju fungicidnih lastnosti smo ugotovili, da so gobe veliko bolj napadle nezaščitene kot pa zaščitene vzorce. Glede na rezultate preizkusov lahko zaključimo, da so imeli zaščiteni vzorci v vseh primerih boljše lastnosti od nezaščitenih.

Keywords

vezane plošče;Silvanolin;lepljenje;Meldur H97;mehanske lastnosti;fungicidne lastnosti;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Bajuk]
UDC:	630*84
COBISS:	1818761
Views:	1539
Downloads:	316
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Mechanical and fungicidal properties of plywood protected by "Silvanolin"
Secondary abstract:	Silvanolin protective agent affectively protects wood against pests, but we do not know how to protect plywood, and how this protective agent affects adhesive and gluing. So we decided to impregnate veneers with Silvanolin, and glue veneers together in panels, to see mechanical and fungicidal properties. Veneers were pressure impregnated in a vacuum chamber. In a high press Meldur H97, melamine-urea-folmaldehyde adhesive, was utilised. To examine mechanical properties Zwick 100, according to standard SIST EN 314 for shear strength and SIST EN 310 for the module of elasticity and bending strength was used. Density was determined according to standard SIST EN 323, humidity to SIST EN 322. Fungicidal properties of impregnated and unimpregnated samples were analysed; so were the beech wood samples just for control. Thus all 3 samples were exposed to 3 mushrooms (Poria vaillantii, Trametes versicolir and Hypoxylon fragiforme) for 16 weeks in a growth chamber in accordance with standard SIST EN 113. We found out that mechanical properties of the samples were slightly better in protected samples than in unprotected ones. Measuring humidity we found out that the protected samples had higher humidity than unprotected ones. Density of the protected samples was also higher. In determining fungicidal properties we found out that the unprotected samples infested with fungi were much more attacked than those protected. So depending on the results of the test we concluded that the protected samples in all the cases had better properties than unprotected ones.
Secondary keywords:	plywood;Silvanolin;gluing;Meldur H97;mechanical properties;fungicidal properties;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	X, 55 f., [22] f. pril.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	21885