ABSTRACT

Since its market entry in 2001, ThermoWood® has become the most established form of thermal modification globally. Whilst its properties have been widely reported, there is still a need for a readily-applied quality control method to ensure treatments meet the criteria outlined by the International ThermoWood Association. One such method for quality control has focussed on the use of colour measurements. In the largest study of its kind, colour measurement data have been evaluated for Norway spruce and Scots pine subjected to the Thermo-D ThermoWood® process at twelve industrial plants between 2007 and 2018. This showed that the colour measurement according to the CIELAB* colour space on newly planed surfaces of thermally modified timber (TMT) may be used for quality control of the ThermoWood® Thermo-D process with regard to process intensity, i.e. the combined effect of temperature (212 ± 3°C) and time. In order to obtain more robust control, only the L* parameter (lightness) should be used as a quality indicator, as both a* and b* parameters for the TMT showed little variation from those of the unmodified wood and too high a scatter in values.

摘要

自 2001 年进入市场以来，ThermoWood® 已成为全球最成熟的热改性形式。虽然其特性已被广泛报道，但仍需要一种易于应用的质量控制方法，以确保处理符合国际热木协会概述的标准。一种这样的质量控制方法侧重于颜色测量的使用。在同类研究中规模最大的一项研究评估了 2007 年至 2018 年间在 12 家工厂采用 Thermo-D ThermoWood® 工艺的挪威云杉和苏格兰松的颜色测量数据。热改性木材 (TMT) 新刨光表面上的空间可用于 ThermoWood® Thermo-D 工艺的质量控制，即工艺强度，即 温度 (212 ± 3°C) 和时间的综合影响。为了获得更稳健的控制，只有L * 参数（亮度）应用作质量指标，因为TMT 的a * 和b * 参数与未改性木材的参数差异很小，并且值的分散性太高。