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福建22种常见树种木材远红外吸收光谱相似,在波数1840cm~（-1）附近均有个最强的透射峰。对22种木材进行远红外穿透深度测定,最大的是山槐弦向0.71mm;最小的是罗木石楠径向,0.135mm。弦向大于径向,且与木材密度、含水率等有关。木材对远红外吸收遵守朗伯定律,但吸收系数径向比弦向大。本文根据木材的远红外光谱图分析,提出木材纤维素、木素对远红外吸收,主要是分子含氧基团等键链间的振动吸收。根据远红外对木材的穿透深度,并通过热导方程分析、计算,认为厚度2mm以下薄板内部形成“正热源”是可能的。这为远红外木材干燥提供了科学依据。
The fossils of 22 kinds of common trees in Fujian have similar far-infrared absorption spectra, and have the strongest transmission peak around the wave number of 1840cm -1. Far-infrared penetration depth measurements were performed on 22 species of wood, with the largest being 0.71 mm in the string, and the smallest being 0.125 mm in diameter. Chord is greater than the radial, and with the density of wood, moisture content and so on. Wood’s far-infrared absorption follows the Lambert law, but its absorption coefficient is larger in the radial direction than in the chord. Based on the analysis of far-infrared spectra of wood, the paper proposed the absorption of wood cellulose and lignin to the far-infrared absorption, which is mainly the vibrational absorption of key chains such as molecular oxygen-containing groups. According to the far-infrared penetration depth of wood, and through the thermal conductivity equation analysis, calculation, that the thickness of 2mm below the formation of a “positive heat source” is possible. This provides a scientific basis for far infrared wood drying.