diplomski projekt
Dejan Sašek (Author), Milan Šernek (Reviewer), Sergej Medved (Mentor)

Abstract

Uporaba lesnih ploščnih kompozitov je zelo razširjena, saj je iz njih narejena večina pohištva. Kar 95 % lesnih ploščnih kompozitov je zlepljenih s poli-kondenzacijskimi lepili, pri katerih je formaldehid pomembna spojina, ki kasneje počasi iz izdelka emitira v okolje. Hitrost emisije je odvisna od številnih dejavnikov kot npr. deleža in vrste lepila, zgradbe plošče, gostote plošče in vsebnosti vlage, oz. okolja kateremu je izdelek izpostavljen. Raziskovali smo vpliv relativne zračne vlažnosti na emisijo formaldehida. Za testiranje smo izbrali 3-slojne iverne plošče. Izpostavili smo jih različnim relativnim vlažnostim pri konstantni temperaturi 20 °C. Razpon vlažnosti se je gibal od 0 % in pa do 87 % relativne zračne vlažnosti. Za referenčno vrednost smo izbrali plošče izpostavljene okolju s 65 % relativne zračne vlažnosti. Emisijo prostega formaldehida smo izmerili po steklenični metodi. Prav tako smo raziskovali emisijo po pretečenem daljšem časovnem obdobju. Ugotovili smo, da je prišlo do povečane emisije pri absolutno suhih vzorcih in vzorcih izpostavljenih 87 % relativni zračni vlažnosti. Emisija se je čez čas zmanjšala in izenačila pri vseh vzorcih.

Keywords

vlažnost;iverne plošče;prosti formaldehid;emisija;

Data

Language: Slovenian
Year of publishing:
Source: Ljubljana
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [D. Sašek]
UDC: 630*862.2
COBISS: 2048393 Link will open in a new window
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Other data

Secondary language: English
Secondary title: Impact of moisture content of particleboards on formaldehyde emission
Secondary abstract: The use of wood based panels is widespread due to the fact that most of the furniture is made from these products. Almost 95 % of wood based panels are made using polycondensational adhesives. Formaldehyde is a major component in these adhesives, and any unbound formaldehyde will emit from wood based panels that have been made using the aforementioned adhesives. The emission rate of formaldehyde depends on the type and amount of adhesive used, density of the panel and the moisture content of the product or the environment surrounding it. For the experiment we took commercially available 3-layered particle boards and exposed them to different levels of humidity at a constant temperature of 20 °C. The levels of humidity ranged from absolutely dry to 87 %. The reference humidity level was at 65 %. The emission of free formaldehyde was measured using the WKI flask method. We also looked at what happens to formaldehyde emissions after a prolonged period of time. We found that both high (87 %) and extremely low humidity increased the emission rate of free formaldehyde. After a prolonged period of time, the free formaldehyde emissions decreased and eventually equalized in all samples.
Secondary keywords: humidity;particle board;free formaldehyde;emission;
Type (COBISS): Diploma project paper
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: VI, 19 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: 22214