求翻译：在Prüfbau印刷适性仪的第一个印刷单元中，试验油墨于被控条件下被均匀的涂抹在纸样上；然后在设置好的时间间隔（典型的有15秒、30秒、60秒和90秒）后，将纸张与事先固定在第二个印刷单元上的纸条加压接触，于是油墨被转移到纸条上。测量这张纸条的白度下降值，白度下降得越多，说明原纸样上油墨固着缓慢，油墨被转移较多[21]。是什么意思？

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In Prüfbau in the printability meter first printing unit, the experimental printing ink even is spread under the accusation condition wipes on the paper type; Then after the time-gap which establishes (model has 15 second, 30 second, 60 second and 90 seconds), with fixes beforehand the paper on the

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