1.东北林业大学机电工程学院,黑龙江哈尔滨 150040
2.广东省林业科学研究院森林工业研究所,广东广州 510520
3.中国林业科学研究院木材工业研究所,北京 100091
扫 描 看 全 文
田心池,马红霞,薛勃等.含水率对不同密度竹基纤维复合材料热压传热的影响[J].木材科学与技术,2022,36(05):50-55.
TIAN Xin-chi,MA Hong-xia,XUE Bo,et al.Effect of Moisture Content on Heat Transfer during Hot-Pressing Process of Bamboo Scrimber with Different Densities[J].Chinese Journal of Wood Science and Technology,2022,36(05):50-55.
竹基纤维复合材料在热压过程中由于含水率的影响，其传热性能与力学性能均会产生较大差异。在热压过程中出现芯层温度急剧升高、蒸汽压力过大的“锅炉效应”，导致板材热压周期发生变化。本文探讨含水率对不同密度板坯热压传热和“锅炉效应”的影响，并建立不同密度时含水率对升温时间的数学模型。结果表明，由于“锅炉效应”的影响，在升温阶段，同一密度下，升温时间随含水率的提升而逐渐缩短；在保压阶段，最高温度和升温温度随着含水率的提高而升高；在降温阶段，密度为0.90 g/cm,3,时，板材的降温时间随含水率的升高先增后减，密度为1.05 g/cm,3,和1.20 g/cm,3,时，降温时间随含水率的增加而降低。因此，在实际生产中，压制密度大于1.05 g/cm,3,的板材时，建议含水率控制在15%左右。该研究为竹基纤维复合材料热压工艺提供了借鉴和参考。,2
Due to the influence of moisture content during hot pressing, the heat transfer and mechanical properties of bamboo scrimber will be different. During the hot pressing process, there will be a "boiler effect" that the core layer temperature raised sharply, leading to change in the hot pressing cycle of plates. The influence of moisture content on hot pressing heat transfer and "boiler effect" of slabs with different densities was investigated, and the mathematical model of temperature raised time with different moisture content and densities was established. The results showed that due to the influence of "boiler effect", under the same density, the heating time was gradually shortened with the increase of water content; In the pressure maintaining stage, the maximum temperature and temperature raised with the increase of water content. When the density was 0.90 g/cm,3, the cooling time of the plate increased first, and then decreased with the increase of water content. When the density was 1.05 g/cm,3, and 1.20 g/cm,3, the cooling time decreased with the increase of water content. Therefore, in actual production, when pressing plates with a density greater than 1.05 g/cm,3, it was recommended that the moisture content be controlled at about 15%. This study provided a reference for the hot pressing process of bamboo based fiber composites.
竹基纤维复合材料热压传热含水率锅炉效应
bamboo scrimberhot-pressing heat transfermoisture contentboiler effect
刘正添，王洁瑛，于辉. 影响刨花板热压传热过程因素的研究[J]. 北京林业大学学报, 1995, 17(2): 64-72.
LIU Z T, WANG J Y, YU H. Study on factors influencing the heat-transfer process in hot-pressing of wood particleboard[J]. Journal of Beijing Forestry University, 1995(2):64-72.
谢力生, 赵仁杰, 张齐生. 胶粘剂对纤维板热压传热的影响[J].木材工业, 2003, 17(2):15-16.
XIE L S, ZHAO R J, ZHANG Q S. The Influence of adhesive on heat-conduction during fiberboard hot-pressing[J]. China Wood Industry, 2003, 17(2):15-16.
黎爱纯. 中密度纤维板导热系数的测定[J]. 林产工业, 1997, 24(2): 27-30.
YANG Q X. Theoretical expressions of thermal conductivity of wood[J]. Journal of Forestry Research, 2001, 12(1): 43-46.
刘翔, 张洋, 李文定, 等. 含水率对胶合板热压传热的影响[J]. 林业科技开发, 2013, 27(1): 32-34.
LIU X, ZHANG Y, LI W D, et al. Effects of moisture content on heat transfering during plywood during hot-pressing[J]. China Forestry Science and Technology, 2013, 27(1): 32-34.
雷亚芳. 板坯含水率对刨花板热压过程中传热的影响[J]. 木材工业, 2006, 20(6): 20-22.
LEI Y F. Influence of mat moisture content on heat-conduction during hot-pressing[J]. China Wood Industry, 2006, 20(6): 20-22.
谢力生, 杨珍. 板坯表面喷水对刨花板热压传热的影响[J]. 木材工业, 2005, 19(4): 12-14, 21.
XIE L S, YANG Z. Influence of surface sprinkling on heat conduction during pressing of particleboard[J]. China Wood Industry, 2005, 19(4): 12-14, 21.
Zombori B G, Kamke F A, Watson L T. Simulation of the internal conditions during the hot-pressing process[J]. Wood and Fiber Science, 2003, 35(1): 2-23.
崔璨. 重组竹喷蒸热压工艺的研究[D]. 南京: 南京林业大学, 2016.
隋仲义, 唐伟, 王春明, 等. 竹木复合材导热性能的研究[J]. 林业科技, 2006, 31(1): 50-51.
陈天全. 大片刨花板热压过程中温度、气压和含水率变化规律研究[D]. 北京: 北京林业大学, 2006.
Huang Y X, Ji Y H, Yu W J. Development of bamboo scrimber: a literature review[J]. Journal of Wood Science, 2019, 65: 25.
Qu W, Yang C M, Ma Y, et al. Analysis of the structure and hydraulic function of bordered pits using the lattice boltzman method[J]. Forests, 2021, 12(5): 526.
魏金光, 韦亚南, 张亚慧, 等. 心、边材及重组木密度对辐射松重组木性能的影响[J]. 木材工业, 2017, 31(6): 43-45.
WEI J G, WEI Y N, ZHANG Y H, et al. Effect of heartwood and sapwood of Pinus radiata as well as scrimber density on scrimber properties[J]. China Wood Industry, 2017, 31(6): 43-45.
余养伦, 周月, 于文吉. 密度对桉树纤维化单板重组木性能的影响[J]. 木材工业, 2013, 27(6): 5-8.
YU Y L, ZHOU Y, YU W J. Effect of density on properties of scrimber made of fibrosis of Eucalyptus veneer[J]. China Wood Industry, 2013, 27(6): 5-8.
杨瑾瑾, 傅万四, 于文吉. 人造板热压过程中板坯内部温度、气压、含水率研究现状与分析[J]. 木材加工机械, 2008, 19(3): 34-37, 33.
YANG J J, FU W S, YU W J. Research status of the parameters of internal-mat conditions during hot-pressing[J]. Wood Processing Machinery, 2008, 19(3): 34-37, 33.
侯俊峰, 伊松林, 周永东, 等. 热压干燥过程中热压板温度对杨木水分状态的影响[J]. 北京林业大学学报, 2018, 40(6): 111-116.
HOU J F, YI S L, ZHOU Y D, et al. Effects of platen temperature on moisture state in poplar lumber during hot-press drying[J]. Journal of Beijing Forestry University, 2018, 40(6): 111-116.
Bromley L A.Heat transfer in stable film boiling[J].Chem Eng Prog,1950,46:221.
相关作者
相关机构
京公网安备11010802024621
微信公众号