干燥器法检测人造板甲醛释放量的主要影响因素及不确定度  

Influencing Factors and Uncertainty of Formaldehyde Emission in Wood-Based Panels by Desiccator Method

作　　者：尹梦婷 李伯涛[1] 吕斌[1] 付跃进[1] 杨帆[1] 邹献武[1] Yin Mengting;Li Botao;Lü Bin;Fu Yuejin;Yang Fan;Zou Xianwu(National Center for Quality Supervision and Testing of Wood and Bamboo Products Research Institute of Wood Industry,CAF,Beijing 100091)

机构地区：[1]中国林业科学研究院木材工业研究所国家人造板与木竹制品质量监督检验中心,北京100091

出　　处：《林业科学》2020年第11期159-167,共9页Scientia Silvae Sinicae

基　　金：国家重点研发计划课题“木质家居材料健康安全性能检测与评价技术研究”(2016YFD0600706)。

摘　　要：【目的】针对干燥器法检测人造板甲醛释放量存在的重现性差、准确度不高等问题,研究干燥器法检测过程中的主要影响因素及不确定度,为干燥器法甲醛检测标准改进提供技术支持和理论依据。【方法】以饰面刨花板为研究对象,考察吸收水量和板材承载率对板材甲醛释放量干燥器法检测结果的影响,同时分析干燥器法检测过程中各种不确定度的来源,计算其不确定度。【结果】当吸收水量由20 mL增至300 mL时,板材甲醛稳定释放值从49μg增至72μg,当板材承载率由0.037 m 2•m^-3增至17.6 m 2•m^-3时,单位承载率下板材甲醛稳定释放值由2.14 mg•L^-1降至0.88 mg•L^-1。板材甲醛释放量越低,其干燥器法检测值偏差越大,40 L干燥器法的测量不确定度较9-11 L干燥器法更高。在不确定度的主要来源中,重复测量引入的不确定度对总体不确定度的贡献最大。【结论】吸收水量与板材甲醛释放量呈正相关,承载率与板材甲醛释放量呈负相关。在试验过程中,每个步骤都应严格按照标准规范操作,以保证数据的准确性和可靠性。【Objective】The desiccator method is one of the main methods to determine formaldehyde emission in wood-based panels.However,the desiccator method also has some problems such as poor reproducibility and low accuracy.In order to improve the accuracy of the measurement results,it is necessary to study the main influencing factors and measurement uncertainty of the desiccator method.【Method】In this paper,veneer particleboard was used as the research object,the influences of water absorption and panel’s loading rate on the determination of formaldehyde emission in panel by desiccator method were investigated.Meanwhile,the sources of various uncertainties in the determination processes of desiccator method were analyzed,and the uncertainty was also calculated.【Result】When the water absorption increased from 20 mL to 300 mL,the stable release value of formaldehyde increased from 49μg to 72μg.When the load-carrying ratio of sheet metal increased from 0.037 m 2•m^-3 to 17.6 m 2•m^-3,the stable release value of formaldehyde decreased from 2.14 mg•L^-1 to 0.88 mg•L^-1 at unit load-carrying ratio.Furthermore,the uncertainty of the 40 L dryer method was higher than that of the 9-11 L dryer.Among the main sources of uncertainty,the uncertainty introduced by repeated measurements contributed the largest to the overall uncertainty.【Conclusion】Absorbed water was positively correlated with formaldehyde emission,while carrying capacity was negatively correlated with formaldehyde emission.In the processes of experiment,each step should be operated according to the standard specification to ensure the accuracy and reliability of the data.

关 键 词：干燥器法 人造板 甲醛 不确定度 

分 类 号：TS67[轻工技术与工程]