Dimenzijska obstojnost ivernih plošč s povišano gostoto

diplomsko delo - univerzitetni študij

Janez Zupančič (Author), Milan Šernek (Reviewer), Sergej Medved (Mentor)

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.

Keywords

iverna plošča;debelinski nabrek;delež lepila;UF lepilo;MF lepilo;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Zupančič]
UDC:	630*862.2
COBISS:	1843337
Views:	850
Downloads:	225
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Dimensional stability of high density particleboard
Secondary 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.
Secondary keywords:	particleboard;thickness swelling;bonding factors;UF resin;MF resin;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	VIII, 39 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:	21927