Abstract Incomplete curing of sheet moulding compounds (SMC), as well as the post-curing and outgassing during the industrial thermal coating process, are the two main reasons for the coating problems of SMC Class-A automotive parts. Furthermore, their surface properties as contact angle and surface roughness strongly depend on the processing parameters of thermal curing and coating as well as cleaning and pickling methods used. Consequently, cost and energy-intensive additional process steps are required in the automotive industry in order to reduce or avoid above mentioned problems during the industrial coating process of SMC-Class-A automotive parts. A cost-efficient robust procedure is required in order to overcome these disadvantages as well as to fulfil the requirements of the industrial coating process. Based on electron beam curing and surface functionalization by low energy electrons a novel pre-treatment procedure was developed and tested. For this purpose, two different compact electron emitters have been coupled to an industrial robot in order to validate this novel in-line pre-treatment procedure. Through this one-step treatment, post edge-layer curing and surface functionalization of the three-dimensional SMC-parts are achieved.

中文翻译：

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3D 片状模塑料 (SMC) 的表面改性和边缘层后固化

摘要 片状模塑料（SMC）的不完全固化，以及工业热涂层过程中的后固化和脱气是SMC A类汽车零部件涂层问题的两个主要原因。此外，它们的表面特性如接触角和表面粗糙度在很大程度上取决于热固化和涂层的加工参数以及所使用的清洁和酸洗方法。因此，汽车工业需要成本和能源密集的额外工艺步骤，以减少或避免 SMC-A 类汽车零件工业涂层过程中的上述问题。为了克服这些缺点并满足工业涂层工艺的要求，需要一种具有成本效益的稳健程序。基于电子束固化和低能电子的表面功能化，开发并测试了一种新的预处理程序。为此，两个不同的紧凑型电子发射器已连接到工业机器人，以验证这种新颖的在线预处理程序。通过这一一步处理，实现了三维 SMC 部件的后边缘层固化和表面功能化。