Otrobi kot alternativni vir za izdelavo ivernih plošč

Završki, Kristjan (avtor), Medved, Sergej (mentor)

V naši raziskavi smo preučili uporabo ter lastnosti ivernim ploščam podobnega kompozita iz pšeničnih otrobov. Zbrane otrobe smo posušili in ločili v dva velikostna razreda, in sicer v fine frakcije (sita z odprtino 1,0 mm in manjše) in velike frakcije (sita z odprtinami 1,27 mm in več). V nadaljevanju smo izdelali otrobe, jih oblepili z urea-formaldehidnim lepilom in z njimi izvedli serijo poizkusov. Izdelali smo enoslojne plošče (z uporabo vseh frakcij), kjer smo preverjali vpliv deleža lepila, ter trislojne plošče, kjer smo preverjali vpliv gostote. Pri enoslojnih ploščah smo uporabili vse frakcije (delež lepila med 7,5 in 20 %), pri trislojnih ploščah smo za zunanji sloj uporabili fine frakcije (delež lepila 20 %), za srednji sloj pa grobe frakcije (delež lepila 20 %). Izdelanim ploščam smo določili debelino in gostoto, upogibno trdnost in modul elastičnosti, razslojno trdost ter debelinski nabrek. Dobljeni rezultati kažejo na možnost uporabo plošč v nezahtevne namene, torej na uporabo za pakiranje, embalažo ter izdelke, kjer se ne pričakuje visoke trdnosti.

• Jezik: Slovenski jezik
• Ključne besede: pšenica, otrobi, lesni kompozit, iverna plošča, urea-formaldehid
• Vrsta gradiva: Diplomsko delo/naloga
• Organizacija: BF - Biotehniška fakulteta
• Leto izida: 2024
• PID: 20.500.12556/RUL-162088
• Datum objave v RUL: 19.09.2024

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Miller's bran as alternative source for particleboard manufacturing

Izvleček

In our research, we examined the use and properties of a composite similar to particleboard made from miller’s bran. The collected bran was dried and separated into two size classes: fine fractions (sieves with openings of 1.0 mm and smaller) and large fractions (sieves with openings of 1.27 mm and larger). Subsequently, the bran was coated with urea-formaldehyde adhesive and a series of experiments were conducted. We produced single-layer boards (using all fractions) to test the effect of adhesive content, and three-layer boards to investigate the effect of density. For the single-layer boards, all fractions were used (with adhesive content ranging from 7.5% to 20%), while for the three-layer boards, fine fractions were used for the outer layers (with 20% adhesive content), and coarse fractions were used for the middle layer (with 20% adhesive content). The produced boards were tested for thickness and density, bending strength and elastic modulus, internal bond strength, and thickness swelling. The results suggest that these boards could be suitable for basic uses like packaging and products where high strength is not required.

• Ključne besede: weat, bran, wood composites, particleboard, urea-formaldehyde