本文对于用平板法测试多层隔热材料当量导热系数的原理和结构形式做了概括性的论述,着重分析了获得精确的测量结果所应考虑的各种因素,由于试件的“边缘热效应”是其中的主要影响因素,提出对一试件分别进行所谓“极低温工况”和“极高温工况”两次测试,其结果的算术平均值可近似地代表它的当量导热系数。 This paper summarizes the principle and structure of the equivalent thermal conductivity of multi-layer insulation materials by the flat plate method, and emphatically analyzes the various factors that should be considered in obtaining the accurate measurement results. Because of the “edge thermal effect” Is one of the main influencing factors. It is proposed that two tests of so-called “very low temperature conditions” and “extremely high temperature conditions” be conducted respectively on one test piece. The arithmetic mean of the results can approximately represent its equivalent thermal conductivity.