PECVD barrier coating systems on post-consumer recyclates for food contact applications

IF 2.4 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Surface Engineering Pub Date : 2022-12-02 DOI:10.1080/02670844.2023.2181258

Lara Kleines, Thomas Blasius, R. Dahlmann

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Abstract

ABSTRACT As using recyclates in the food sector is currently severely restricted due to the risk of harmful contamination, the reuse of PCR (Post-Consumer Recyclates) could be greatly increased through the development of migration barriers. However, the deposition of functional barrier coatings in PECVD processes (Plasma-Enhanced Chemical Vapour Deposition) on thermoformed PCR polypropylene cups is non-trivial due to complex geometries and difficult surface properties (high roughness, non-polarity, fluctuation of recycylate properties). To develop barriers in this system, material properties of recyclate and virgin material were compared by rheometric and thermal analysis and surface properties of PCR and virgin material cups were analysed morphologically in order to define specific coating challenges. Subsequently, coatings were deposited by PECVD consisting of both, silicon organic intermediate layers (SiOCH) and silicon oxide barrier layers (SiOx). The barrier, measured by the oxygen transmission rate, could be improved by a factor of about 60 compared to uncoated cups.

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PECVD屏障涂层系统的消费后回收食品接触应用

由于有害污染的风险，目前在食品部门使用回收物受到严格限制，因此通过迁移障碍的发展，可以大大增加PCR(消费后回收物)的再利用。然而，在PECVD工艺(等离子体增强化学气相沉积)中，由于复杂的几何形状和困难的表面特性(高粗糙度、非极性、回收性能波动)，在热成型PCR聚丙烯杯上沉积功能屏障涂层并非易事。为了在该系统中建立屏障，通过流变学和热分析比较了回收材料和原始材料的材料特性，并对PCR和原始材料杯的表面特性进行了形态学分析，以确定具体的涂层挑战。随后，通过PECVD沉积由硅有机中间层(SiOCH)和硅氧化物阻挡层(SiOx)组成的涂层。通过测量氧气传输速率，这种屏障可以比没有涂层的杯子提高约60倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Surface Engineering 工程技术-材料科学：膜

CiteScore

5.60

自引率

14.30%

发文量

审稿时长

2.3 months

期刊介绍： Surface Engineering provides a forum for the publication of refereed material on both the theory and practice of this important enabling technology, embracing science, technology and engineering. Coverage includes design, surface modification technologies and process control, and the characterisation and properties of the final system or component, including quality control and non-destructive examination.