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如何区别热敏纸的正反面
更新时间: 2020-09-16 00:00:00  

热敏纸原理:在基纸上涂上一层化学涂料,常温下无色,受热后变为黑色,所以热敏纸有正反面区别,可采用下面的方法区分:1、卷式的热敏纸,纸面外的是正面,纸面内为反面。2、对着光,光面为正面,涩面为反面。3、用打火机快速烤一下,变黑的为正面,不变的为反面。

关键词: 如何 区别 正反面

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