Omočitev in adhezija pri lepljenju hitro rastočih lesnih vrst

diplomsko delo (visokošolski strokovni študij)

Izak Kalčič (Author), Katarina Čufar (Reviewer), Milan Šernek (Mentor)

Abstract

Raziskovali smo omočitev in adhezijo pri lepljenju hitro rastočih lesnih vrst. Uporabili smo fenol-formaldehidno lepilo GP 3110 in 5 pri nas komercialno manj pomembnih lesnih vrst: brezo, črno jelšo, topol, zeleni bor in vrbo. S pomočjo mikroskopa, digitalnega fotoaparata in računalnika smo ugotavljali kontaktni kot kapljice fenol-formaldehidnega lepila na posameznih lesnih vrstah. Vroče smo zlepili po 2 lameli ter iz takih lepljencev izdelali preizkušance za ugotavljanje strižne trdnosti. Te smo pred meritvijo izpostavili različnim pogojem kot so klimatiziranje, namakanje v vodi, kuhanje in sušenje. Strižni preizkus smo izvajali s pomočjo univerzalnega testirnega stroja Zwick Z100. Ugotovili smo, da se kontaktni koti lepila med posameznimi lesnimi vrstami niso veliko razlikovali. Najmanjši kontaktni kot lepila smo izmerili pri zelenem boru (najmanjša gostota lesa), največjega pa pri brezi (največja gostota lesa). Na strižno trdnost lepilnega spoja preizkušancev je vplivala priprava oziroma pogoji pri katerih smo tretirali in testirali preizkušance. Na trdnost lepilnega spoja je vplivala tudi gostota lesa.

Keywords

lepljenje lesa;fenolno lepilo;kontaktni kot;strižna trdnost;adhezija;

Data

Language:	Slovenian
Year of publishing:	2006
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[I. Kalčič]
UDC:	630*824.832
COBISS:	1453449
Views:	1514
Downloads:	329
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Wetting and adhesion at gluing fast growing timber
Secondary abstract:	Wetting and adhesion at gluing of fast growing species was studied. Phenol-formaldehyde glue GP 3110 and 5 commercially less important wood species (birch, black alder, poplar, green pine and willow) were used. A microscope, digital photo camera and computer were used to find the contact angle of phenol-formaldehyde glue drop on specific wood species. 2 lamellas were hot glued together. Testers made for measuring the shear strength were exposed to different conditions (acclimatisation, soaking in water, boiling). The shear test was performed with Zwick Z100 universal testing machine. Contact angles did not differ much among specific species. The lowest contact angle was measured at green pine wood (lowest wood density), the highest at birch wood (highest wood density). It was also found that the shear strength of the adhesive bond of the testers was influenced by the conditions under which they were treated and tested. Wood density also influenced shear strength.
Secondary keywords:	wood gluing;phenol glue;contact angle;shear strength;adhesion;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univ. v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo
Pages:	IX, 43 f.
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:	21043