20.500.12556/RUL-173593 Izdelava biokompozita iz skorje z uporabo mokrega postopka stiskanja Manufacturing of bark based biocomposite by wet process pressing V lesarstvu in tudi drugih gospodarskih panogah se materiali hitro razvijajo, kar lahko pripišemo znanju strokovnjakov, ki delujejo na teh področjih, kot tudi tehnologiji in digitalizaciji, ki se razvija iz dneva v dan in praktično sega že na vsa področja našega življenja. Če se osredotočimo le na lesarstvo, imamo na področju pohištvene industrije veliko izbire med masivnim lesom kot tudi številne lesne kompozite, kot je npr. iverna plošča, vlaknena plošča, furnirna plošča itd. Pri konstrukcijah se veliko uporabljajo OSB plošče, ki imajo dobre mehanske lastnosti. V vseh omenjenih kompozitih je les osnoven material. Les je naraven in pogojno obnovljiv material z dokazano pozitivnim učinkom na zdravje in počutje ljudi. Z lesom pa je tesno povezana lesna skorja, katere uporaba je zelo omejena in neizkoriščena. Le ta se največkrat uporabi kot energent (biomasa), pri urejanju krajine, pri strojenju kože in v farmaciji. Pri proizvodnji kompozitov na osnovi iveri in vlaken se srečamo s številnimi izzivi, med njimi tudi kakšno surovino uporabiti za izdelavo gradnikov in kako zmanjšati porabo energije, še posebej energijo potrebno za sušenje gradnikov. Zato smo izdelali iverne plošče iz skorje po mokrem postopku stiskanja, kjer so bile ciljne začetne vlažnosti gradnikov 0 %, 10 %, 20 % in 50 %, le te pa smo ločili na majhne gradnike, srednje velike in velike gradnike. Ivernim ploščam smo določili sorpcijske in mehanske lastnosti, pri čemer smo ugotovili, da slabše prenašajo upogibne obremenitve, boljše pa razslojne obremenitve, poleg tega ima skorja dobre sorpcijske lastnosti, kot sta debelinski nabrek in vpijanje vode. Slabše mehanske lastnosti smo zaznali pri visoki začetni vlažnosti gradnikov (50 %), do vlažnosti 20 % pa ni bilo videti razlik, kar je zelo pozitivno z vidika ekonomičnosti in porabe energije za sušenje gradnikov. Iz ugotovitev lahko zaključimo, da bi se plošče iz skorje lahko uporabile kot alternativa že uveljavljenih materialov oz. lesnim ploščam v pohištveni industriji in v gradbeništvu. Smotrno bi jih bilo uporabiti tudi v prostorih s povišano vlažnostjo oz. kjer je potreba po višji odpornosti na vlago. In the woodworking industry, as well as in other economic sectors, materials are rapidly evolving. This can be attributed both to the expertise of professionals working in these fields and to the continuous development of technology and digitalization, which increasingly permeates all aspects of our lives. Focusing solely on woodworking, the furniture industry offers a wide selection of materials, ranging from solid wood to various wood-based composites such as particleboard, fiberboard, plywood and more. In construction, OSB panels are commonly used due to their good mechanical properties. In all of these composites, wood serves as the base material. Wood is a natural and conditionally renewable material, with proven positive effects on human health and well-being. Closely linked to wood is bark, a material whose potential remains largely untapped and underutilized. Bark is most often used as a source of energy (biomass), in landscaping, leather tanning and the pharmaceutical industry. When producing wood-based composites like particleboard and fiberboard, we face numerous challenges, among them, selecting suitable raw materials for wood particles and minimizing energy consumption, particularly the energy required for drying. To address this, we produced particleboards using bark by wet pressing method, with target initial moisture contents of 0 %, 10 %, 20 %, and 50 %. The particles were categorized into small, medium, and large sizes. We measured the sorption and mechanical properties of particleboards and found that they have lower bending strength but better internal bond strength. Additionally, particleboards showed good sorption characteristics, such as thickness swelling and water absorption. Inferior mechanical performance was observed at the highest initial moisture content (50 %), while up to 20 % moisture, no significant differences were noted, which is very promising from the energy efficiency standpoint and cost-effectiveness in drying. Based on results, we can conclude that bark-based panels could serve as an alternative to conventional materials or wood-based boards in the furniture and construction industries. They may also be particularly suitable for use in environments with elevated humidity or where increased moisture resistance is required. skorja iverne plošče moker postopek stiskanja sorpcijske lastnosti mehanske lastnosti bark particle boards wet process pressing sorption properties mechanical properties true false false [U. Tajher] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-09-19 07:16:18 2025-09-19 07:16:25 2025-11-11 03:39:57 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*862:630*282 264929 249585411 52803.pdf 52803.pdf 1 A0C550BCADE6CB6E7EB37E5500581BC1 125d97d685feecaa67f92208d495b321e358f32fe81090b81412bee7ad106155 9cdf667c-9517-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=218196 52805.xlsx 52805.xlsx 1 084BDB9218B4E7861B98EA75D7B7CD46 39f5787953abee19e7d5c5392dc0b8d0ba1962621aabddeb21be24a7620646af 9cdfb9ce-9517-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=218197 52806.xlsx 52806.xlsx 1 3D0CF5A2C45C021AD3C6866954AAC5C8 7997cb7bd5aa977185a8b1ee9d6b322cef0717efd2a1f1133fd5a819556625a4 9cdfebb6-9517-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=218198 52807.xlsx 52807.xlsx 1 B7008ED8C89A718C664DFF9C5EABF0F3 0cf27236ec20843829e847cbdee3aede04bc7977b27c7fe3cb1e2022dc0e8fe9 9ce01fc2-9517-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=218199 Biotehniška fakulteta 0 0 0