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首页> 外文期刊>Wood and Fiber Science >The effect of cyclic relative humidity changes on moisture content and thickness swelling behavior of oriented strandboard.
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The effect of cyclic relative humidity changes on moisture content and thickness swelling behavior of oriented strandboard.

机译：循环相对湿度变化对定向刨花板含水量和厚度膨胀行为的影响。

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摘要

This study examines the effect of cyclic RH exposure on MC and thickness swelling (TS) of oriented strandboard (OSB) made from fire-impacted trees. Two specimens were cut from the center of each OSB panel and one was edge-sealed. After being conditioned to 65% RH, specimens were placed in a climate-controlled chamber and subjected to three cyclic changes of 90 - 30% RH at 20pC. Experimental data were characterized by three time-dependent MC or TS models: logarithmic, power law, and exponential. The latter two models gave the best fits showing that edge-sealing reduced the extent of swelling during adsorption and reduced the moisture loss at desorption. The models also described the effect of burnt level and bark throughout the humidity exposure cycles. The exponential model revealed no significant effect of burnt level on the panel TS. Both the power law and exponential models indicated that addition of charred bark to the panels significantly decreased the maximum amount of moisture and thickness change. The exponential model revealed an increase in equilibrium TS at the end of each RH cycle compared with the end of precyclic desorption. True nonrecoverable TS was difficult to discern in Cycle 1 because of moisture hysteresis, but the nonrecoverable effect was evident in Cycles 2 and 3.
机译：这项研究研究了循环RH暴露对火烧树制成的定向刨花板（OSB）的MC和厚度膨胀（TS）的影响。从每个OSB面板的中央切下两个标本，并边缘密封一个。调节到相对湿度为65％之后，将标本放置在恒温室中，并在20pC下经受90-30％相对湿度的三个循环变化。实验数据通过三种时间相关的MC或TS模型进行表征：对数，幂定律和指数模型。后两个模型给出了最佳拟合，表明边缘密封可减少吸附过程中的溶胀程度并减少解吸时的水分流失。该模型还描述了整个湿度暴露循环中烧焦程度和树皮的影响。指数模型显示燃烧水平对面板TS没有显着影响。幂律模型和指数模型均表明，在板上添加焦木皮可显着降低最大水分含量和厚度变化。与前循环解吸结束相比，该指数模型揭示了在每个RH循环结束时平衡TS的增加。由于水分滞后，很难在周期1中辨别出真正的不可恢复的TS，但是在周期2和3中却表现出不可恢复的效果。

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