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研究人员测量并分析了新闻纸由压光处理而引起的自身强度下降的情况。这项研究涉及到两种纤维原料,一种是100%的二次纤维(RCF),另外一种是100%的TMP。这两种纸浆均在中试纸机上完成纸页成形,同时在装备有钢棍的中试压光机上进行纸页的压光处理。研究范围还包括经过硬压光和软压光的商品用纸(由100%RCF组成)。研究人员利用一个简单的公式把影响抗张强度的纤维自身性质和纤维间结合力分开考虑。该公式表明,无论纤维自身强度是否变化,纸张抗张强度都会发生改变。纤维自身强度降低的程度可以测量出来,但是由压光操作而引起的强度损失主要还是来自于纤维间结合强度的下降。应用:理解压光如何导致新闻纸抗张强度的降低有助于我们找到把强度损失降到最低的方法。
Researchers measured and analyzed the decline in self-strength of newsprint caused by calendaring. The study involved two types of fiber materials, one with 100% secondary fiber (RCF) and one with 100% TMP. Both of these pulps finished sheet formation on a pilot paper machine while the sheet was calendered on a pilot calender equipped with a steel rod. The study also included hard calendered and soft calendered commercial paper (made of 100% RCF). Researchers use a simple formula to consider the nature of the fibers that affect the tensile strength and the fiber-to-fiber binding force. The formula shows that the tensile strength of the paper changes regardless of whether the strength of the fiber changes. The degree of fiber self-strength reduction can be measured, but the loss of strength due to calendering is mainly due to the decrease in bond strength between the fibers. Application: Understanding how calendering can lead to a decrease in the tensile strength of newsprint helps us find ways to minimize the loss of strength.