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Vpliv vrste lepila na sorpcijske lastnosti iverne plošče : diplomsko delo - visokošolski strokovni študij = Impact of adhesive type on the sorption properties of particleboard : graduation thesis - higher professional studiesBozovičar, JureIverna plošča je zaradi svoje narave higroskopičnega materiala dimenzijsko nestabilna, kadar jo izpostavimo višji ali nižji relativni zračni vlažnosti in/ali vodi. Najpomembnejša posledica, ki jo ... povzroča povišanje relativne vlažnosti plošč je sprememba debeline, ki povzroča nabrekanje in krčenje lignoceluloznih iveri in sproščanje notranjih napetosti dodanih v procesu stiskanja ivernih plošč. Spremembo debeline smo merili gravimetrično in s pomočjo vertikalne porazdelitve prostorninskih mas. Primerjali smo rezultate sorpcijskih sprememb vzorcev izdelanih z urea in fenol-formaldehidnimi smolami. Klimatizirane vzorce smo izpostavili enemu ciklu vlaženja pri 85 5 % in sušenja pri 35 5 % relativni zračni vlažnosti s konstantno temperaturo 20 °C. Cikel vlaženja je trajal 648 ur, cikel sušenja pa 240 ur. Pri primerjavi rezultatov UF in FF vzorcev smo ugotovili, da je na koncu uravnovešanja v vlažni klimi relativna sprememba vlažnosti in debeline FF vzorcev znašala 18,15 % in 11,32 %; pri UF vzorcih pa 15,50 % in 4,98 %. Sprememba vlažnosti in debeline je v zunanjem sloju (ZS) pri FF vzorcih znašala 8,48 % in 6,60 % ter 17,78 % in 6,43 % pri UF vzorcih. Sprememba vlažnosti in debeline je v srednjem sloju (SS) pri FF vzorcih znašala 28,92 % in 10,44 % ter 28,92 % in 10,44 % pri UF vzorcih. Ireverzibilna sprememba debeline je na koncu enega cikla nihajoče klime pri FF vzorcih znašala 0,73 mm in 0,3 mm pri UF vzorcih. Izmerjena prostorninska masa absolutno suhih FF vzorcev je znašala 0,707 g/cm3, za ZS 0,842 g/cm3 in 0,621 g/cm3 za SS. Pri UF vzorcih je znašala izmerjena prostorninska masa 0,664 g/cm3, za ZS 0,821 g/cm3 in SS 0,577 g/cm3.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [J. Bozovičar], 2010Language - slovenianCOBISS.SI-ID - 1792905
Author
Bozovičar, Jure
Other authors
Medved, Sergej |
Gorišek, Željko
Topics
iverna plošča |
lastnosti |
sorpcija |
vlažnost |
debelina |
ireverzibilna sprememba debeline |
urea |
fenol |
particleboard |
sorption properties |
thickness swelling |
springback |
urea |
phenol |
phenol
Library/institution |
City | Acronym | For loan | Other holdings |
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BF, Department of Wood Science and Technology, Lj. | Ljubljana | BFLES |
reading room 1 cop.
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Year | Impact factor | Edition | Category | Classification | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Bozovičar, Jure | |
Medved, Sergej | 15410 |
Gorišek, Željko | 05732 |
Source: Personal bibliographies
and: SICRIS
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