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在档案的技术保护中,防光是一个起码的条件。然而在实际工作中,人们却忽视了这一点,甚至在有些单位为了通风透气而门户大开,让光这一无形的“蛀虫”任意施虐,危害档案的安全。我们知道光主要是使档案纸张的纤维素受到破坏,它能断裂档案纸中纤维素分子的碳一碳键,还可破坏非纤维分子及字迹材料中的色素,降低档案制成材料的耐久性。据有关资料介绍:断裂纤维素分子中一个简单的C C键需要的能量为58.6千卡/克分子;断裂一个线性饱和键所需要的能量为80千卡/克分子。而所有波长短于480毫微米的光线即可断裂C C键,短于358毫微米的紫外线即可断裂有机物分子的线性饱和键。
In the archives of technical protection, light is a minimum condition. However, in actual work, people neglected this point. Even when some units opened their doors for ventilation and ventilation, the invisible “moth” of light was arbitrarily abused and endangering the safety of archives. We know that light mainly damages the cellulose of archival paper. It breaks the carbon-carbon bond of cellulose molecules in archive paper, destroys the pigments in non-fibrous molecules and handwriting materials, and reduces the durability of archival materials . According to the data, the energy required to break a simple C C bond in a cellulose molecule is 58.6 kcal / mol; the energy required to break a linear saturated bond is 80 kcal / mol. All light with a wavelength shorter than 480 nm breaks the C C bond, and ultraviolet rays shorter than 358 nm break the linear saturated bond of organic molecules.