TAILIEUCHUNG - Comparison of the swelling and shrinkage characteristics of corcisan pine (Pinus nigra var. Mantima)

The objective of this study was to determine the volumetric swelling and shrinkage characteristics of air-dried Corsican pine in the longitudinal, tangential and radial directions. For this purpose, the swelling of the wood was caused by the wood being increased in water whilst placed in a swelling jig, and the shrinkage made in an oven by drying. | Turk J Agric For 24 (2000) 461–464 © TÜBİTAK Comparison of the Swelling and Shrinkage Characteristics of Corcisan Pine (Pinus nigra var. mantima) İlker USTA, Arif GURAY Hacettepe University, Department of Wood Products Industrial Engineering, 06532 Beytepe, Ankara-TURKEY Received: Abstract: The objective of this study was to determine the volumetric swelling and shrinkage characteristics of air-dried Corsican pine in the longitudinal, tangential and radial directions. For this purpose, the swelling of the wood was caused by the wood being increased in water whilst placed in a swelling jig, and the shrinkage made in an oven by drying. The experimental results showed that although the differences in swelling or shrinking occur in the first 5 hours, both swelling and shrinkage are then negligible in the three directions. The values of swelling-shrinkage showed considerable difference among different directions; for instance, swelling-shrinkage in the tangential direction was as nearly twice as greater than in the radial direction, and during the experimental period it was considered negligible in the longitudinal direction. Analyses of the data collected during this study suggest that the difference of swelling-shrinking between the tangential and radial directions is caused by the anatomical structure of wood species studied. It is therefore concluded that particularly the wood rays are an important contributory factor in the anisotropy of swelling and shrinkage in Corsican pine. Korsika Çamı (Pinus nigra var. mantima)’nın Daralma ve Genişleme Özelliklerinin Karşılaştırılması Özet: Bu çalışma ile hava kurusu rutubette bulunan Korsika çamı’nın boyuna, teğet ve radyal yöndeki boyutsal genişleme ve daralma değerlerinin değişim eğiliminin belirlenmesi amaçlandı. Bu nedenle, içi su ile doldurulmuş bir ıslatma kabına bırakılan ağaç malzemenin içerisine su alarak boyutlarının genişletilmesi ve kurutma kabininde kurutularak boyutlarının daraltılması sağlandı.

• Nông nghiệp
• Pine Pinus nigra var
• Mantima
• Shrinkage characteristics
• Volumetric swelling
• Wood species studied
• Microscopic porous structure
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp
• Softwood species
• Longitudinal flow
• Full cell
• Proportional saturation
• Fluid uptake