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为探索利用气相色谱测定压敏复写纸字迹形成时间的新方法,对收集到的17种压敏复写纸制作字迹样品,利用气相色谱法对其从溶剂成分上进行了分类,分析了气相色谱法测定压敏复写纸字迹形成时间的机理,对各种压敏复写纸样品字迹中所含有的3种易挥发成分乙二醇、二甘醇和丙三醇分别在自然老化和人为老化条件下进行了跟踪检测。得出在自然老化条件下该3种易挥发成分随形成时间的变化规律和在人为老化条件下该3种易挥发成分随老化时间的变化规律。利用气相色谱法可以对不同老化条件下压敏复写纸字迹的形成时间进行测定,为实际相关案件的检验提供依据。
In order to explore a new method to determine the writing time of pressure-sensitive carbon paper by gas chromatography, 17 kinds of pressure-sensitive carbon paper samples were collected and analyzed by gas chromatography. The characterization of gas pressure was analyzed by gas chromatography The mechanism of the writing time of sensitive carbon paper was studied. The three volatile compounds ethylene glycol, diethylene glycol and glycerin contained in the writing samples of various pressure-sensitive carbon paper were tracked under natural aging and artificial aging respectively. The change law of the three volatile components with the formation time under natural aging condition and the variation law of the three volatile components with the aging time under the condition of artificial aging were obtained. Gas chromatography can be used to determine the formation time of pressure-sensitive carbon copy paper under different aging conditions, which provides the basis for the test of actual related cases.