Kerschbaumer Roman Christopher, Bolka Silvester, Pesl Teja, Duretek Ivica, Lucyshyn Thomas
Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria.
Faculty of Polymer Technology, Ozare 19, 2380 Slovenj Gradec, Slovenia.
Polymers (Basel). 2021 Aug 17;13(16):2757. doi: 10.3390/polym13162757.
The perception of a surface and its haptic properties are significantly influenced by roughness and microstructure, respectively, whereby non-negligible parameters include friction, contact area, temperature, and humidity between the human finger and the examined surface. In particular, for a scientific investigation on haptic influences, the production of samples with a defined surface roughness is indispensable. The aim of this study is to analyze the impact of various mold insert roughnesses combined with the influences of particle size, filler-, and compatibilizer content on impression quality. An unfilled high density polyethylene was chosen as a reference for the impression quality investigations, while fillers with significantly different particle sizes and a compatibilizer were used to produce proprietary compounds. Injection molded parts were manufactured utilizing mold inserts with three different line roughness values. To support the obtained results, a multivariate analysis of variance, a simulation of the filling phase as well as a rheological material characterization were conducted. The results revealed that (i) the impression quality can be independent of the applied insert roughness based on the filler particle size that was studied, (ii) an increasing on both filler particle size and compatibilizer content raise the sample roughness as a function of the penetration ability of the filler into the insert valleys, and (iii) with a higher insert roughness, the thermoplastic moldings generally exhibit a significantly smoother topography. An assumed correlation between part roughness and melt viscosity could not be confirmed.
表面的感知及其触觉特性分别受到粗糙度和微观结构的显著影响，其中不可忽视的参数包括人类手指与被检测表面之间的摩擦力、接触面积、温度和湿度。特别是，对于触觉影响的科学研究而言，生产具有确定表面粗糙度的样品是必不可少的。本研究的目的是分析各种模具镶件粗糙度与粒径、填料和增容剂含量的影响相结合对压印质量的影响。选择未填充的高密度聚乙烯作为压印质量研究的参考，同时使用具有显著不同粒径的填料和增容剂来生产专有化合物。利用具有三种不同线粗糙度值的模具镶件制造注塑部件。为了支持所获得的结果，进行了方差的多变量分析、填充阶段的模拟以及流变材料表征。结果表明：（i）基于所研究的填料粒径，压印质量可能与所应用的镶件粗糙度无关；（ii）随着填料粒径和增容剂含量的增加，样品粗糙度会随着填料渗入镶件凹槽的穿透能力而增加；（iii）镶件粗糙度越高，热塑性模制品通常表现出明显更光滑的表面形貌。零件粗糙度与熔体粘度之间的假定相关性未得到证实。
