مورد إلكتروني
Surface Roughness and Wettability of Surface Densified Heat-Treated Norway Spruce (Picea abies L. Karst.)
| العنوان: | Surface Roughness and Wettability of Surface Densified Heat-Treated Norway Spruce (Picea abies L. Karst.) |
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| عناروين إضافية: | Hrapavost i stupanj kvašenja ugušćene površine pregrijane smrekovine (Picea abies L. Karst.) |
| المصدر: | Drvna industrija; ISSN 0012-6772 (Print); ISSN 1847-1153 (Online); Volume 70; Issue 4 |
| بيانات النشر: | Faculty of Forestry and Wood Technology, University of Zagreb 2019 |
| تفاصيل مُضافة: | Nadir Ayrilmis Mirko Kariz Jin Heon Kwon Manja Kitek Kuzman |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | Surface roughness and wettability of the heat-treated and then surface densified spruce (Picea abies L. Karst.) wood were measured to determine the effect of densification and heat-treatment on wood surface properties. The process of heat-treatment with an initial vacuum was performed in a vacuum chamber on oven dried lamellas with dimensions of 630 mm (longitudinal direction) x 45 mm (tangential direction) x 25 mm (radial direction). The lamellas were heat-treated at four different temperatures which were 170 °C, 190 °C, 210 °C and 230 °C. Control specimens were not exposed to heat-treatment. The lamellas were first heated to 100 °C, the creation of a vacuum taking 30 min at this temperature, and then heated to the desired temperature, and treated at this constant temperature for 3 h. The lamellas were then cooled down by using coils with cold water inside the chamber. Surface densification of lamellas with compression from 22 mm to 15 mm thickness was made by press platens heated at 150 °C and held in that position for 60 s. After the 1 min, the heated platen was cooled to 90 °C, whilst the specimen remained under compression to minimize immediate spring back. The total time of compression was 2 min (30 s closing, 60 s pressing and approx. 30 s cooling). In the treatment groups, the optimum treatment temperature on the one-side densified wood specimens was found to be 170 °C based on the surface roughness and wettability values. Surface densification significantly decreased the surface roughness of the wood specimens. The surface quality of wood can be improved when the wood is exposed to the heat-treatment and then surface densification. Cilj istraživanja bio je izmjeriti hrapavost i stupanj kvašenja površine pregrijane i površinski ugušćene smrekovine (Picea abies L. Karst.) kako bi se utvrdio utjecaj ugušćivanja i pregrijavanja na svojstva površine drva. Proces pregrijavanja s početnim vakuumom proveden je u vakuumskoj komori na apsolutno suhim lamelama dimenzija 630 mm (uzdužni smjer) × 45 mm (tangentni smjer) × 25 mm (radijalni smjer). Lamele su pregrijane na četiri različite temperature: 170 °C, 190 °C, 210 °C i 230 °C. Kontrolni uzorci nisu bili pregrijani. Lamele su najprije zagrijane na 100 °C i pri toj je temperaturi za postizanje vakuuma bilo potrebno 30 min. Uzorci su nakon toga zagrijani na željenu temperaturu koja je konstantno održavana tri sata. Potom su lamele ohlađene uz pomoć hladne vode koja se nalazila u spiralnim cijevima unutar komore. Ugušćivanje površine lamela s 22 mm na 15 mm debljine provedeno je prešanjem zagrijanim pločama na temperaturi 150 °C u trajanju 60 s. Nakon jedne minute zagrijana je ploča ohlađena na 90 °C, dok je uzorak ostao pod pritiskom kako bi se umanjio trenutačni povrat. Ukupno vrijeme prešanja iznosilo je 2 min (30 s zatvaranje, 60 s prešanje i oko 30 s hlađenje). Na temelju vrijednosti hrapavosti i stupnja kvašenja utvrđeno je da je optimalna temperatura za jednostrano ugušćivanje ploče 170 °C. Ugušćivanjem površine znatno se smanjila hrapavost površine uzoraka drva. Zaključeno je da se kvaliteta površine drva može poboljšati pregrijavanjem i ugušćivanjem površine. |
| مصطلحات الفهرس: | heat-treatment; wood; surface roughness; wettability; densification, pregrijavanje; drvo; hrapavost površine; stupanj kvašenja; ugušćivanje, text, info:eu-repo/semantics/article, info:eu-repo/semantics/publishedVersion |
| URL: | info:eu-repo/semantics/altIdentifier/doi/10.5552/drvind.2019.1852 |
| الإتاحة: | Open access content. Open access content info:eu-repo/semantics/openAccess Journal Drvna industrija is at the highest possible level of Open Access, meaning that all content is immediately and freely available to anyone, anywhere, to be downloaded, printed, distributed, read, reused, self archived, and re-mixed (including commercially) without restriction, as long as the author and the original source are properly attributed according to the Creative Commons Attribution 4.0 International License (CC BY). The author(s) hold the copyright and retain publishing rights without restrictions. CC BY (Creative Commons Attribution) is the most accommodating of public copyright licenses as defined by Creative Commons, a nonprofit organization that provides legal tools for sharing and use of creative works and research. The CC BY license is recommended for maximum dissemination and use of licensed materials. All content published in Journal of Drvna industrija is available under CC BY, meaning anyone is free to use and reuse the content provided the original source and authors are credited. The copyright is held and retained. The author(s) hold the copyright without restrictions. |
| ملاحظة: | application/pdf English |
| أرقام أخرى: | HRCAK oai:hrcak.srce.hr:229836 1349086290 |
| المصدر المساهم: | HRCAK PORTAL ZNANSTVENIH CASOPISA REPUB From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1349086290 |
| قاعدة البيانات: | OAIster |
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