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Omočitev in adhezija pri lepljenju hitro rastočih lesnih vrst : diplomsko delo (visokošolski strokovni študij)
Kalčič, Izak (Author), Šernek, Milan (Mentor) More about this mentor... This link opens in a new window, Čufar, Katarina (Reviewer)

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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.

Language:Slovenian
Keywords:lepljenje lesa, fenolno lepilo, kontaktni kot, strižna trdnost, adhezija
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2006
Publisher:[I. Kalčič]
Number of pages:IX, 43 f.
Place:Ljubljana
UDC:630*824.832
COBISS.SI-ID:1453449 Link is opened in a new window
Views:1140
Downloads:267
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Secondary language

Language:English
Title:Wetting and adhesion at gluing fast growing timber : graduation thesis (higher professional studies)
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.

Keywords:wood gluing, phenol glue, contact angle, shear strength, adhesion

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