Vpliv deleža skorje v iverni plošči na vsebnost prostega formaldehida

diplomsko delo

Urška Gajšek (Author), Vesna Tišler (Reviewer), Sergej Medved (Mentor)

Abstract

Formaldehid je prisoten povsod v našem okolju. Zdravju je škodljiv, zato poskušamo znižati njegovo raven na minimum. Prosti formaldehid je v iverni plošči prisoten zaradi polikondenzacijskih lepil (UF, FF, MF, MUF, itd.). Sčasoma začne izhajati iz plošč, le-te pa največkrat uporabljamo za notranje prostore. Raziskovali smo vpliv deleža skorje v iverni plošči na izhajanje prostega formaldehida. Iz lesa bukve (Fagus sylvatica L.) smo naredili 10 ivernih plošč z različnimi deleži (20, 35, 50, 65 in 80 %) skorje smreke (Picea abies L.). Iz vsake plošče smo izrezali po 10 vzorcev (25x25x16 mm), ter jim izmerili vsebnost formaldehida po standardizirani steklenični metodi SIST EN 717-3. Ugotovili smo, da se z naraščajočim deležem skorje količina emitiranega formaldehida močno zmanjša, vendar le do neke meje. Vzrok zato so polifenolne snovi kot so ekstraktivi, lignin in tanini, ki predstavljajo največji del skorje.

Keywords

iverna plošča;skorja;prosti formaldehid;emisija;

Data

Language:	Slovenian
Year of publishing:	2008
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[U. Gajšek]
UDC:	630*862.2
COBISS:	1631113
Views:	1207
Downloads:	275
Average score:	0 (0 votes)
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Other data

Secondary language:	English
Secondary title:	Influence od wood bark particle in particleboard on emission of free formaldehyde
Secondary abstract:	Formaldehyde is present everywhere in our environment. Because of its harmful properties to the health we want to lower its level to a minimum. Free formaldehyde is present in particle boards, because of polycondensation resins: MF, UF, MUF, etc. In the course of time free formaldehyde releases from particle boards, most often used indoors. Influence of wood bark particles on emission of free formaldehyde was investigated. 10 particle boards from beech wood (Fagus sylvatica L.) with different amounts (20, 35, 50, 65 and 80 %) of spruce bark (Picea abies L.) were tested. 10 samples (25x25x16 mm) were made from each particle board; then by standard glass method SIST EN 717-3 formaldehyde was measured. It was found out that increasing the bark share the amount of free formaldehyde was strongly reduced, but just to some level. Polyphenol substances like extractives, lignin and tannins, representing the main part of the bark, are the reason for this to happen.
Secondary keywords:	particleboard;bark;free formaldehyde;emission;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	IX, 35 f., [2 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:	21353