Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber

The relationships between free shrinkage and actual shrinkage of different layers in Mongolian Scotch pine (Pinus sylvestris var. mongolica Litv.) were explored to provide basic data for the further study of drying shrinkage properties. The free shrinkage coefficients at different temperatures and t...

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Autores principales:	Xiaodong Zhu, Jingyao Zhao, Wanhui Gao, Cheng Qian, Yunjia Duan, Shuaichao Niu, Yingchun Cai
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Mongolian Scotch pine free shrinkage effect of temperature actual shrinkage Plant ecology QK900-989
Acceso en línea:	https://doaj.org/article/03572ccc90c84c0d912efcdf8800d8a1
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spelling	oai:doaj.org-article:03572ccc90c84c0d912efcdf8800d8a12021-11-25T17:37:58ZLaws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber10.3390/f121115001999-4907https://doaj.org/article/03572ccc90c84c0d912efcdf8800d8a12021-10-01T00:00:00Zhttps://www.mdpi.com/1999-4907/12/11/1500https://doaj.org/toc/1999-4907The relationships between free shrinkage and actual shrinkage of different layers in Mongolian Scotch pine (Pinus sylvestris var. mongolica Litv.) were explored to provide basic data for the further study of drying shrinkage properties. The free shrinkage coefficients at different temperatures and the actual shrinkage strain of each layer were examined under conventional drying. The results showed high precision of free drying shrinkage of corresponding layers of thin small test strips in each layer of sawn timber. The free shrinkage increased linearly as moisture content declined. At the same temperature, the free shrinkage coefficient reached the largest values for the first layer (above 0.267%), while the smallest values were recorded for the ninth layer (below 0.249%). Except for the ninth layer, the free shrinkage coefficients in width directions of other representative layers decreased as temperature increased. At constant temperature, the difference in free shrinkage coefficient of test materials in the length direction of sawn timber was small for the first layer, but slightly larger and changed irregularly in the fifth and ninth layer direction. At the end of conventional drying, the plastic deformation of each layer in the early stage of drying showed a reducing trend or even reversal due to the effects of reverse stress and later damp heat. In sum, these findings look promising for future optimization of wood drying process.Xiaodong ZhuJingyao ZhaoWanhui GaoCheng QianYunjia DuanShuaichao NiuYingchun CaiMDPI AGarticleMongolian Scotch pinefree shrinkageeffect of temperatureactual shrinkagePlant ecologyQK900-989ENForests, Vol 12, Iss 1500, p 1500 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mongolian Scotch pine free shrinkage effect of temperature actual shrinkage Plant ecology QK900-989
spellingShingle	Mongolian Scotch pine free shrinkage effect of temperature actual shrinkage Plant ecology QK900-989 Xiaodong Zhu Jingyao Zhao Wanhui Gao Cheng Qian Yunjia Duan Shuaichao Niu Yingchun Cai Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber
description	The relationships between free shrinkage and actual shrinkage of different layers in Mongolian Scotch pine (Pinus sylvestris var. mongolica Litv.) were explored to provide basic data for the further study of drying shrinkage properties. The free shrinkage coefficients at different temperatures and the actual shrinkage strain of each layer were examined under conventional drying. The results showed high precision of free drying shrinkage of corresponding layers of thin small test strips in each layer of sawn timber. The free shrinkage increased linearly as moisture content declined. At the same temperature, the free shrinkage coefficient reached the largest values for the first layer (above 0.267%), while the smallest values were recorded for the ninth layer (below 0.249%). Except for the ninth layer, the free shrinkage coefficients in width directions of other representative layers decreased as temperature increased. At constant temperature, the difference in free shrinkage coefficient of test materials in the length direction of sawn timber was small for the first layer, but slightly larger and changed irregularly in the fifth and ninth layer direction. At the end of conventional drying, the plastic deformation of each layer in the early stage of drying showed a reducing trend or even reversal due to the effects of reverse stress and later damp heat. In sum, these findings look promising for future optimization of wood drying process.
format	article
author	Xiaodong Zhu Jingyao Zhao Wanhui Gao Cheng Qian Yunjia Duan Shuaichao Niu Yingchun Cai
author_facet	Xiaodong Zhu Jingyao Zhao Wanhui Gao Cheng Qian Yunjia Duan Shuaichao Niu Yingchun Cai
author_sort	Xiaodong Zhu
title	Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber
title_short	Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber
title_full	Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber
title_fullStr	Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber
title_full_unstemmed	Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber
title_sort	laws governing free and actual drying shrinkage of 50 mm thick mongolian scotch pine timber
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/03572ccc90c84c0d912efcdf8800d8a1
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Laws Governing Free and Actual Drying Shrinkage of 50 mm Thick Mongolian Scotch Pine Timber

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