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Surface and printing properties of synthetic film papers

机译：合成薄膜纸的表面和印刷性能

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We studied the surfaces, including both the composition effects and the processing rates, of polypropylene (PP) composite films used for synthetic paper to determine the surface free energy (gamma(s)) and the irregularities on the film surfaces. We correlated these two characteristics to the printing quality by assessing the facility with which the offset ink was removed from the surface of the paper and also the ink absorption. Five films with different compositions were uniaxially oriented with a flat-die extruder at two different stretching rates. The results of scanning electron microscopy (SEM) of the films showed good dispersion and distribution of the filler particles used in the compositions of the films and also of the polystyrene (PS) dispersed throughout the PP matrix. The SEM analysis also revealed slightly high surface irregularities on the film surfaces through a high concentration of CaCO3, which thus increased the coefficients of static and kinetic friction and the gamma(s) values. These film properties created better printing quality and also more strongly fixed offset ink onto the film. However, the films with high relative quantities of PS in their composition showed a high polar component in their total gamma(s) when compared to films with less PS or no PS in their compositions. However, because of the apolar characteristic of the offset printing ink, the ink absorption worsened. The films underwent stretching at two different rates, which did not significantly affect the gamma(s) values or the friction coefficients; however, they did slightly change the printing quality and ink adhesion. (C) 2003 Wiley Periodicals, Inc. [References: 23]
机译：我们研究了用于合成纸的聚丙烯（PP）复合薄膜的表面，包括组成效应和加工速率，以确定表面自由能（γ）和薄膜表面的不规则性。通过评估从纸张表面去除胶印油墨的设施以及油墨吸收率，我们将这两个特性与印刷质量相关联。用平模挤出机以两种不同的拉伸速率将五种具有不同组成的薄膜单轴取向。膜的扫描电子显微镜（SEM）的结果表明，用于膜组合物中的填料颗粒以及分散在整个PP基质中的聚苯乙烯（PS）具有良好的分散性和分布性。 SEM分析还显示，由于高浓度的CaCO3，膜表面的表面不规则性稍高，从而增加了静摩擦系数和动摩擦系数以及gamma（s）值。这些薄膜特性可创造出更好的印刷质量，并将胶印油墨更牢固地固定在薄膜上。然而，与组成中PS较少或没有PS的膜相比，组成中具有相对相对高的PS的膜在它们的总γ中显示出高极性组分。但是，由于胶版印刷油墨的非极性特性，油墨吸收性恶化。薄膜以两种不同的速率拉伸，这不会显着影响γ值或摩擦系数。但是，它们确实稍微改变了打印质量和油墨附着力。 （C）2003 Wiley Periodicals，Inc. [参考：23]

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