Sorpcijske in nabrekovalne značilnosti ivernih plošč

diplomsko delo (visokošolski strokovni študij)

Jaka Soršak (Author), Željko Gorišek (Reviewer), Sergej Medved (Mentor)

Abstract

Na ravnovesno vlažnost plošč vpliva več dejavnikov, med njimi tudi debelina in tip plošče oziroma vrsta lepila. Pri poizkusu smo imeli 4 različne tipe ploščč iz njih smo izžagali 24 vzorčkov dimenzij 50 mm X 50 mm. Te smo najprej navlaževali, in sicer v klimah z relativno zrčno vlažnostjo 34 %, 65 %, 75 %, 90 % in 98 % do konstantne mase. Zatem smo postopek obrnili in jih pričeli sušiti. Imeli smo iste klime kot pri navlaževanju. Na koncu smo jih dali še v sušilnik s 103 +- 2 °C. Opazovali smo spremembe mase in nabreka. Najbolje so se obnesli vzorčki P5, zlepljeni z melamin-formaldehidnim lepilom. Tudi vzorčki OSB3, zlepljeni z izocianatnim lepilom, so se dobro obnesli do relativne zračne vlažnosti 90 %, nato pa se je nabrek močno povečal. Pri debelejših in tanjših vzorčkih P2, ki so bili zlepljeni z urea-formaldehidnim lepilom, so se bolje obnesli tanjši vzorčki.

Keywords

iverne plošče;higroskopnost;lepilo;nabrek;

Data

Language:	Slovenian
Year of publishing:	2007
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Soršak]
UDC:	630*862.2
COBISS:	1492105
Views:	1262
Downloads:	287
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Sorption and swelling characteristics of particle boards
Secondary abstract:	Various factors affect the equilibrium moisture content in particle boards; so as thickness of the board, type of the board, and type of the resin. 4 different types of particle boards were used for our experiment. They were cut into 24 samples; their size was 50 mm X 50 mm. First, samples were moistened in a climate with 34 %, 65 %, 75 %, 90 % and 98 % atmospheric humidity, maintaining the constant weight of the particles. After moistening, the boards were dried using the same climates as before, and then put into a dryer with 103+-2 °C. Changes of weight and swelling were observed. P5 samples glued by melamine-formaldehyde resine turned out to be the best. OSB3 samples glued by isosyanate resin turned out well up to 90 % humidity; then the swelling increased significantly. Among P2 samples glued by urea-formaldehyde resin the thinner samples turned out to be better from the thicker ones.
Secondary keywords:	particle board;hygroscopicity;resin;swelling;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univ. v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo
Pages:	VIII, 65 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:	21085