Istraživanje utjecaja toplinske obrade na svojstva uslojene ploče od bukovine

Autor: Aurel Lunguleasa, Nadir Ayrilmis, Cosmin Spirchez, Ferhat Özdemir
Přispěvatelé: İÜC, Orman Fakültesi, Orman Endüstri Mühendisliği Bölümü
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Drvna industrija
Volume 69
Issue 4
ISSN: 0012-6772
1847-1153
Popis: The aim of this study is to determine the effects of heat treatment on some physical and mechanical properties of beech plywood boards. The 3-layered beech plywood boards with a thickness of 3.9 mm were subjected to heat treatment for 1, 2 and 3 hours at temperatures of 160, 180 and 200 °C. These beech plywood boards were tested for physical properties such as density, water absorption and thickness swelling, mechanical property tests such as modulus of rupture (MOR) and Brinell hardness, and mass loss rates according to the relevant standards. The results obtained show that the hydrophobicity of beech plywood boards is improved but the strength and weight loss are adversely affected, depending on the temperature and duration of heat treatment. It has been found that beech plywood boards heat-treated at 200 °C for 3 hours can be used in very humid environments for average mechanical stresses of wood parts with a reduced thickness swell of 4 % and a reduced water absorption rate of more than 12 %.
Cilj istraživanja bio je utvrditi utjecaj toplinske obrade na neka fizička i mehanička svojstva uslojenih ploča od bukovine. Troslojne uslojene ploče od bukovine debljine 3,9 mm podvrgnute su toplinskoj obradi u trajanju jednoga, dva i tri sata pri temperaturama 160, 180 i 200 °C. Prema odgovarajućim standardima, ispitana su fizička svojstva tih ploča kao što su gustoća, apsorpcije vode i bubrenje, mehanička svojstva poput modula loma (MOR) i tvrdoće prema Brinellu te gubitka mase. Dobiveni su rezultati pokazali da se hidrofobnost ploča povećala, ali je njihova toplinska obrada negativno utjecala na čvrstoću i gubitak mase ovisno o trajanju i temperaturi obrade. Utvrđeno je da se uslojene ploče od bukovine, toplinski obrađene pri temperaturi od 200 °C u trajanju tri sata, mogu upotrebljavati u vrlo vlažnim uvjetima, pri prosječnome mehaničkom opterećenju drvnih dijelova, uz smanjenje bubrenja od 4 % i smanjenje apsorpcije vode veće od 12 %.
Databáze: OpenAIRE
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