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Dimenzijska obstojnost ivernih plošč s povišano gostoto : diplomsko delo - univerzitetni študij
Zupančič, Janez (Author), Medved, Sergej (Mentor) More about this mentor... This link opens in a new window, Šernek, Milan (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/dn_zupancic_janez.pdf This link opens in a new window

Abstract
Ugotavljali smo dimenzijsko obstojnost enoslojnih ivernih plošč s povišano gostoto. V preizkusu smo uporabili 3 vrste lepila: urea-formaldehidno (UF), melamin-urea-formaldehidno (MUF) ter melamin-formaldehidno (MF) lepilo. Izdelane plošče so se razlikovale glede na vrsto lepila, delež lepila (od 15 do 25%), debelino in gostoto. Ugotavljali smo debelinski nabrek ter mehanske lastnosti izdelanih ivernih plošč. Na debelinski nabrek plošč s podobno gostoto zelo vpliva delež in vrsta uporabljenega lepila; ob povečevanju deleža lepila do 25 % se debelinski nabrek manjša. Prav tako se debelinski nabrek zmanjša, če uporabimo modificirano UF ali MF lepilo. Melamin-formaldehidno lepilo se je izkazalo za zelo učinkovito pri zmanjševanju debelinskega nabreka. Ob uporabi UF lepila in deleža lepila 15 % smo zagotovili minimalen debelinski nabrek tako, da smo ivernim ploščam zmanjšali gostoto in povečali debelino. S tem so se poslabšale nekatere druge lastnosti kot je upogibna trdnost, povečala pa se je adsorpcija vode.

Language:Slovenian
Keywords:iverna plošča, debelinski nabrek, delež lepila, UF lepilo, MF lepilo
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2010
Publisher:[J. Zupančič]
Number of pages:VIII, 39 f.
Place:Ljubljana
UDC:630*862.2
COBISS.SI-ID:1843337 Link is opened in a new window
Views:446
Downloads:131
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Secondary language

Language:English
Abstract:
Thesis shows how to improve dimensional stability of high density particleboards. Many types of single layer particleboards were produced. Resintype (UF, MUF, MF), resin content (15 %, 20 % and 25 %), board density (861- 1030 kg/m?) and board thickness (5.3 - 19.8 mm) were variable factors. Pressing temperature ( 180 °C) and pressing time (7 min.) were constant. Particleboards were investigated for dimensional stability (thickness swelling) acording to the SIST EN 317 standard. Panels were tested for their mechanical properties including modulus of elasticity and bending strength acording to the SIST EN 310 standard. Overal results show resin content and resin type used in particleboards have a great influence on particleboard properties. Dimensional stability was improved as the resin content increased from 15 % to 20 %. Where MUF and MF resin were used the thickness swelling was reduced. Melamine formaldehyde resin proved to be very effective in reducing thickness swelling of particleboards. The use of UF resin type and resin content 15 % causes minimum thickness swelling if the density of particleboards is reduced and thickness increased; some other features like bending strength diminish, and water absorption augments.

Keywords:particleboard, thickness swelling, bonding factors, UF resin, MF resin

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