Hummel Sabine, Obermeier Katharina, Zier Katja, Krommes Sandra, Schemme Michael, Karlinger Peter
Department of Plastics Technology, Faculty of Engineering Sciences, Technical University of Applied Sciences Rosenheim, Hochschulstraße 1, 83024 Rosenheim, Germany.
Department of Sustainable Engineering & Management, Faculty of Management and Engineering, Technical University of Applied Sciences Rosenheim, Hochschulstraße 1, 83024 Rosenheim, Germany.
Materials (Basel). 2022 May 29;15(11):3872. doi: 10.3390/ma15113872.
Increasing demand for energy-efficient means of transport has steadily intensified the trend towards lightweight components. Thermoplastic glass fiber composites (organo sheets) play a major role in the production of functional automotive components. Organo sheets are cut, shaped and functionalized by injection molding to produce hybrid components, such as those used in car door modules. The cutting process produces a considerable amount of production waste, which has thus far been thermally recycled. This study develops a closed mechanical recycling process and analyzes the different steps of the process. The offcuts were shredded using two shredding methods and implemented directly in the injection-molding process. Using tensile tests and impact bending tests, the material properties of the recycled materials were compared with the virgin material. In addition, fiber length degradation via the injection-molding process and the influence of the waterjet-cutting process on the mechanical properties are investigated. Recycled offcuts are both comparable to new material in terms of mechanical properties and usability, and are also economically and ecologically advantageous. Recycling polypropylene waste with glass fiber reinforcement in a closed loop is an effective way to reduce industrial waste in a sustainable and economical production process.
对节能运输方式需求的不断增加，稳步强化了汽车部件轻量化的趋势。热塑性玻璃纤维复合材料（有机片材）在功能性汽车部件的生产中发挥着重要作用。有机片材通过注塑成型进行切割、塑形和功能化处理，以生产混合部件，如用于车门模块的部件。切割过程会产生大量生产废料，到目前为止这些废料都是通过热回收处理的。本研究开发了一种封闭式机械回收工艺，并分析了该工艺的不同步骤。采用两种切碎方法对边角料进行切碎，并直接应用于注塑成型工艺。通过拉伸试验和冲击弯曲试验，将回收材料的材料性能与原始材料进行了比较。此外，还研究了注塑成型过程中纤维长度的降解以及水刀切割工艺对机械性能的影响。回收的边角料在机械性能和可用性方面与新材料相当，而且在经济和生态方面也具有优势。在闭环中回收玻璃纤维增强的聚丙烯废料，是在可持续和经济的生产过程中减少工业废料的有效方法。
