Densification of poplar veneer

CHEN Chen; FAN Xianglin; DENG Yuhe; CHEN Min; WU Jing; YANG Ying; HOU Tianyu; WANG Xiangge

doi:10.11833/j.issn.2095-0756.2013.04.012

Volume 30 Issue 4

Jul. 2013

Turn off MathJax

Article Contents

Article Navigation > Journal of Zhejiang A&F University > 2013 > 30(4): 536-542

CHEN Chen, FAN Xianglin, DENG Yuhe, CHEN Min, WU Jing, YANG Ying, HOU Tianyu, WANG Xiangge. Densification of poplar veneer[J]. Journal of Zhejiang A&F University, 2013, 30(4): 536-542. doi: 10.11833/j.issn.2095-0756.2013.04.012

Citation:

CHEN Chen, FAN Xianglin, DENG Yuhe, CHEN Min, WU Jing, YANG Ying, HOU Tianyu, WANG Xiangge. Densification of poplar veneer[J]. Journal of Zhejiang A&F University, 2013, 30(4): 536-542. doi: 10.11833/j.issn.2095-0756.2013.04.012

Densification of poplar veneer

doi: 10.11833/j.issn.2095-0756.2013.04.012

1.
College of Wood Science and Technology, Nanjing Forestry University，Nanjing 210037，Jiangsu， China;
2.
Patent Examination Cooperation Center of SIPO，Jiangsu，Suzhou 215011，Jiangsu，China;
3.
The New Oriental in Wuxi，Wuxi 214000，Jiangsu，China

More Information

Corresponding author: DENG Yuhe
Received Date: 2012-09-21
Rev Recd Date: 2012-12-30
Publish Date: 2013-08-20

Abstract

The influence of compression and heat-treatment on density and dimensional stability of densified poplar veneer was studied. By changing the elements of hot-pressing and heat-treatment，such as the initial moisture content，compression pressure，temperature and time，heat-treatment temperature and time，the properties of poplar had significant improvement. Results indicated that the initial moisture content should be below 15%. As compression pressure and temperature increased, density continuously improved. When pressure reached 10 MPa，the density was 98.8% higher than untreated veneer，and it was 81.4% higher as the compression temperature rose to 140 ℃. Hot-pressing time showed a density increase of 0.748 gcm-3 for 8 min. Pressed veneer in 20 ℃ and 70 ℃ water had a recovery of set of over 50%. Optimal treatment parameters for densified poplar veneer were initial moisture content under 15%，pressing temperature of 140 ℃，pressing pressure of 8 MPa，and time of 8 min. Chemical component analysis showed that cellulose，hemicellulose and lignin changed with heat-treatment，especially the content of hemicelluloses decreased，and degradation of the strongest hygroscopicity of hemicellulose led to a reduction of hydroscopicity hydroxyl. With higher temperatures and longer times，the weight-loss ratio gradually increased and density decreased. Thus，to maintain density，the temperature should be below 210 ℃，and the time should be less than 40 min.［Ch，4 fig. 1 tab. 13 ref.］
- forest engineering,
- poplar veneer,
- compression,
- heat-treatment,
- density,
- recovery of set

Relative Article

[1]	HAO Jiashi, WANG Yu, YIN Jianyun, YANG Huqing. Chilling injury and antioxidative metabolism in cucumber with combined UV-C and heat treatment . Journal of Zhejiang A&F University, 2018, 35(3): 476-482. doi: 10.11833/j.issn.2095-0756.2018.03.011
[2]	WEI Jinguang, WEI Yanan, BAO Minzhen, ZHANG Yahui, YU Yanglun, LI Changgui, YU Wenji. Effect of density on porosity and physical-mechanical properties of high-performance scrimbers . Journal of Zhejiang A&F University, 2018, 35(3): 519-523. doi: 10.11833/j.issn.2095-0756.2018.03.017
[3]	FANG Yiming, LIN Lujun, LU Zhixiong, FENG Hailin. An air-coupled ultrasonic imaging system for non-destructive wood testing . Journal of Zhejiang A&F University, 2017, 34(2): 355-360. doi: 10.11833/j.issn.2095-0756.2017.02.021
[4]	WANG Xuehua, FEI Benhua, CHAI Yubo, LIU Junliang. Effect of temperature and testing position to heat absorption and temperature increasing rate during Eucalyptus pellita wood heat treatment . Journal of Zhejiang A&F University, 2014, 31(5): 745-750. doi: 10.11833/j.issn.2095-0756.2014.05.013
[5]	YU Le, Lü Jianxiong, LI Xianjun, XU Kang, WU Yiqiang, JIANG Jiali. Comparison of X-ray scanning and slice methods for moisture distribution measurements when drying Cunninghamia lanceolata plantation wood . Journal of Zhejiang A&F University, 2013, 30(4): 543-547. doi: 10.11833/j.issn.2095-0756.2013.04.013
[6]	CHEN Lifang, MA Hongxia, ZHANG Yanjun, WANG Jianjing, CAO Yongjian. Treated wood physical properties after reagent-impregnation with heat-treatment technology . Journal of Zhejiang A&F University, 2013, 30(6): 955-959. doi: 10.11833/j.issn.2095-0756.2013.06.023
[7]	ZHANG Wen-yan, LI Fan, SUN Pan-hua, ZHANG Qi-sheng. Micro-electrolysis treatment for hot，grinding wastewater from MDF production using Fenton’s reagent . Journal of Zhejiang A&F University, 2011, 28(1): 13-17. doi: 10.11833/j.issn.2095-0756.2011.01.003
[8]	WANG Zheng-guo, WANG Zhao-hui, DUAN Xin-fang, ZHOU Yu. Dye uptake with four dye combinations and types on two rattan species . Journal of Zhejiang A&F University, 2011, 28(2): 293-298. doi: 10.11833/j.issn.2095-0756.2011.02.020
[9]	TANG Rong-qiang, BAO Bin-fu, LI Yan-jun. Heat-treatment influence on Cunninghamia lanceolata discoloration . Journal of Zhejiang A&F University, 2011, 28(3): 455-459. doi: 10.11833/j.issn.2095-0756.2011.03.017
[10]	XU Xin-wu, CUI Yue, TANG Zheng-jie. Vertical densification gradient of Populus deltoides lumber with vertical density profile （VDP） technology . Journal of Zhejiang A&F University, 2010, 27(5): 799-802. doi: 10.11833/j.issn.2095-0756.2010.05.027
[11]	DU Chun-gui, ZHANG Qi-sheng, LIU Zhi-kun, CHEN Si-guo. Distribution characteristics of horizontal density of Chinese fir oriented laminated stick lumber （OLSL） . Journal of Zhejiang A&F University, 2009, 26(4): 455-460.
[12]	HAN Shu-guang, ZHOU Zhao-bing, JIANG Hua, ZHANG Yang. Enzyme pretreatments and dynamic wettability of a poplar surface . Journal of Zhejiang A&F University, 2009, 26(6): 774-777.
[13]	LI Jin-liang, ZHENG Xiao-xian. Center setting of circular plot in the investigation of plantation density . Journal of Zhejiang A&F University, 2008, 25(1): 55-59.
[14]	HUANG He-lang, LU Xiao-ning, XUE Li-dan, ZENG Zhi-gao, LIANG Xing-yu. Bonding performance of bamboo plywood improved by O2 plasma treatment . Journal of Zhejiang A&F University, 2006, 23(5): 486-490.
[15]	BAO Bin-fu, SHA Cun-long, YU Wen-jun, JIANG Zhi-hong, YU You-ming, YU Xue-jun. Effects of final treatment techniques on the properties of fast curing cement particle board . Journal of Zhejiang A&F University, 2006, 23(3): 237-241.
[16]	SUN Fang-li, MAO Sheng-feng, WEN Gui-feng, DUAN Xin-fang, CHEN Qi-le. Anti-mold effects of bamboo timber treated with different solutions . Journal of Zhejiang A&F University, 2006, 23(2): 135-139.
[17]	LU Ze-guang, SHEN Li-ming, HUANG He-lang, YANG Qi-yong, XUE Li-dan, LI Yi. Effects of grooved veneer on the quality of multilayer parquet's lacquer film . Journal of Zhejiang A&F University, 2006, 23(4): 468-471.
[18]	SHEN Zhe-hong, JIANG Nian-chun, CHEN Li, LI Wen-zhu, YU You-ming. Effects of production factors on formaldehyde emission of E₁ humid resistant medium density fiberboard . Journal of Zhejiang A&F University, 2005, 22(2): 203-206.
[19]	JIANG Yue-zhong, WANG Kai-fang, LIU Yuan-qian, WU De-jun, CHEN Bao-quan, LIU Wei-guo, WANG Hua-tian. Effect of density and heading height on leaf-use Ginkgo biloba forest . Journal of Zhejiang A&F University, 2004, 21(3): 290-294.
[20]	Lin Qingfu. Variation in Densities and Shrinkages of Chinese Fir Wood From Plantation. . Journal of Zhejiang A&F University, 1997, 14(2): 169-173.

References
Proportional views

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Get Citation

PDF

XML

Article views(2891) PDF downloads(649) Cited by()

Proportional views

Densification of poplar veneer

1. College of Wood Science and Technology, Nanjing Forestry University，Nanjing 210037，Jiangsu， China;

2. Patent Examination Cooperation Center of SIPO，Jiangsu，Suzhou 215011，Jiangsu，China;

3. The New Oriental in Wuxi，Wuxi 214000，Jiangsu，China

Corresponding author: DENG Yuhe

Received Date: 2012-09-21

Rev Recd Date: 2012-12-30

Publish Date: 2013-08-20

Key words:

Abstract: The influence of compression and heat-treatment on density and dimensional stability of densified poplar veneer was studied. By changing the elements of hot-pressing and heat-treatment，such as the initial moisture content，compression pressure，temperature and time，heat-treatment temperature and time，the properties of poplar had significant improvement. Results indicated that the initial moisture content should be below 15%. As compression pressure and temperature increased, density continuously improved. When pressure reached 10 MPa，the density was 98.8% higher than untreated veneer，and it was 81.4% higher as the compression temperature rose to 140 ℃. Hot-pressing time showed a density increase of 0.748 gcm-3 for 8 min. Pressed veneer in 20 ℃ and 70 ℃ water had a recovery of set of over 50%. Optimal treatment parameters for densified poplar veneer were initial moisture content under 15%，pressing temperature of 140 ℃，pressing pressure of 8 MPa，and time of 8 min. Chemical component analysis showed that cellulose，hemicellulose and lignin changed with heat-treatment，especially the content of hemicelluloses decreased，and degradation of the strongest hygroscopicity of hemicellulose led to a reduction of hydroscopicity hydroxyl. With higher temperatures and longer times，the weight-loss ratio gradually increased and density decreased. Thus，to maintain density，the temperature should be below 210 ℃，and the time should be less than 40 min.［Ch，4 fig. 1 tab. 13 ref.］

Densification of poplar veneer

doi: 10.11833/j.issn.2095-0756.2013.04.012

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Related

Proportional views