湿法压纸时再湿

J. D. Mcdonald, R. Kerekes
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引用次数: 7

摘要

在造纸过程中,湿压通过施加一段时间的压力来去除水分,但是一些被排出的水可能会以“再湿”的方式返回到纸上。这些水和其他剩余的水必须通过干燥除去。为了理解再湿的潜在因素,我们开发了一个数学模型,该模型由一个时间相关项和一个时间无关项组成,该项用于解释从毛毡到纸张的水流,另一个用于解释毛毡和纸张之间界面水的分裂。我们的模型与文献中的测量结果是一致的,可以用来理解纸的性质、压机操作和毛毡设计如何最大限度地减少再湿。
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Rewet in wet pressing of paper
Wet pressing in papermaking removes water by pressure applied over time, but some of the expelled water may return to the web in an action called “rewet.” This water, and the other remaining water, must be removed by drying. To understand the underlying factors of rewet, we have developed a mathematical model of it comprised of a time-dependent term that accounts for water flow from the felt to paper and a time-independent term that accounts for splitting of interfacial water between the felt and paper. Our model is consistent with measurements from the literature and can be used to understand how paper properties, press operation, and felt design can minimize rewet.
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