Izdelava kompozita z asimetrično zgradbo

• Main Author: Črnec, Domen
• Other Authors: Medved, Sergej
• Format: Bachelor Thesis
• Language: Slovenian
• Published: D. Črnec 2017
• Subjects: asimetrična plošča; iverna plošča; vlaknena plošča; upogibna trdnost; natezna trdnost; absorpcija vode; modul elastičnosti; asymmetric board; particleboard; fiber board; bending strength; tensile strength; water absorption; modulus of elasticity; info:eu-repo/classification/udc/630*86; sami
• Online Access: https://repozitorij.uni-lj.si/IzpisGradiva.php?id=95622; https://repozitorij.uni-lj.si/Dokument.php?id=104247&dn=; https://plus.si.cobiss.net/opac7/bib/2806153?lang=sl

Zaradi posebnih potreb in zahtev je v proizvodnji lesnih ploščnih kompozitov vse več prilagajanj, bodisi v sami zgradbi proizvoda ali v tehnologiji izdelave. Namen diplomskega dela je prilagoditi strukturo tako, da je končni izdelek asimetrična iverna in/ali vlaknena plošča. Izdelali smo serijo asimetričnih plošč, z različnim deležem in velikostjo gradnikov v posameznem sloju. Določili smo upogibno trdnost, modul elastičnosti, natezno trdnost, absorpcijo vode, gostoto in debelino. Rezultati so bili najboljši pri dvoslojni iverni plošči, ki je bila sestavljena iz 50 % grobih iveri in 50 % srednje velikih iveri. Ugotovljena absorpcija vode je večja pri ploščah, ki imajo na površini večji delež vlaken in finih iveri. Rezultati so pokazali, da večja, kot je količina finih frakcij, večja je gostota. Upogibna trdnost asimetrične plošče je boljša, ko so večji gradniki na spodnji strani obremenjevanja. Upogibna trdnost asimetrične plošče je bila za približno 33 % nižja od upogibne trdnosti simetrične plošče. Due to special needs and requirements, more and more adjustments are needed in the production of wood panel composites. Either within the product's structure or in manufacturing technology. The purpose of the graduation thesis, is to adapt the structure, so that the final product is asymmetric particle and/or fiber board. We made a serie of asymmetrical boards, with a different proportions and sizes of particles in each layer. We determined the bending strength, the modulus of elasticity, tensile strength, water absorption, density and thickness. The best properties were determined for two-layer particleboard, consisting of 50 % big particles and 50 % medium - sized particles. The absorption of water was higher in board, with a higher share of fibers and fine particles on the surface. The results showed that density of board is increasing with increasing share of fine particles. The bending strength of the asymmetric board is higher, when the larger particles are on the underside of the load. The bending strength of the asymmetrical board was approximately 33% lower than the bending strength of the symmetrical board.