河北福彩20选5除五走势图

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您的位置:河北福彩20选5除五走势图 -> 印刷纸张 -> 知识丨纸张的十一大物理性能

知识丨纸张的十一大物理性能


1.定量(Basis Weight)

定量俗称克重,是指单位面积纸张的重量,以每平方米多少克来表示。一般,定量在250/2以下的,称为纸;定量在250/2以上的,称为纸板或板纸。定量是纸张最基本的一项物理指标,它的高低及其均一性,影响着纸张所有的物理及印刷性能。

2.厚度与紧度

厚度表示纸张的厚薄程度,它是指纸或纸板在两测量板间受一定的压力下直接测量的厚度,以mmμm计。一般,厚度大小直接影响纸张的不透明度,厚度大则不透明度越好。厚度的均一性对纸张尤其重要,厚度不均会影响到光泽度和白度的下降及阶调和色彩再现的不稳定。

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3.抗张强度和伸长率(Tensile Strength)

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4.耐折度

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5.纸张的表面强度(Surface Strength)

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6.平滑度(Smoothness)

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7.吸收性(Receptivity

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8.白度 (Brightness)

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9.不透明度(OPAcity)

此特性是指当印刷文字和图片在纸张的一面,而另一面也印有文字或图片,它们都不会发生透映现象。良好的纸张其不透光度高,让制成的书籍使读者阅读时能集中本身页内的内容,不致被印纹两面隐约可见影响使眼睛疲倦。影响不透光度的因素有:i.纸张本身的厚薄;ii.有否上胶;iii.纸张表面的平滑度与粗糙度;iv.所含的植物纤维成份等。测试的方法是测量有多少光能穿透纸张本身,单位是百分比率。

10.光泽度(Gloss

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11.表面效率(surface efficiency

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PSE(%)=100-A(%)+G(%)/2

PSE—纸张的表面效率(paPEr surface efficiency;

A—纸张的吸墨能力;

G—纸张的光泽度。

 

 



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