Despite government and consumer attitudes, industry's use of recycled material remains low and narrowly scoped. Critical advances in recycling practices and technology depend on increased scope of application for regranulates, which can be achieved through design from recycling principles. We investigated regranulates and laboratory reprocessed material in the context of processing, ability to meet functional requirements, viability of closed loop recycling, design strategies and co-dependent industry reforms. Reprocessing results in polymer degradation, changes in melt flow rate (MFR) and tensile impact strength ($a_{tN}$) and restricts polymer processing options. Contamination and multilayer packaging cause changes in MFR, $a_{tN}$, elastic modulus ($E$) and elongation at break (${\epsilon }_b$) affecting ability to meet application-specific functional requirements. The problem is complex, whereby the preferences and requirements of recyclers, designers, industry, and consumers are contradictory. New high value regranulate applications using clever design practices are necessary to finance new sorting and processing technology in addition to industry and consumer tolerance and conservative product expectations to circumvent these competing interests.

尽管政府和消费者态度不佳，但工业界对回收材料的使用仍然很低且范围狭窄。回收实践和技术的重大进步取决于再生颗粒应用范围的扩大，这可以通过回收原则的设计来实现。我们在加工、满足功能要求的能力、闭环回收的可行性、设计策略和相互依赖的行业改革的背景下调查了再造粒和实验室再加工材料。再加工导致聚合物降解、熔体流动速率 (MFR) 和拉伸冲击强度 ($A_{吨否}$) 并限制了聚合物的加工选择。污染和多层包装导致 MFR 的变化，$A_{吨否}$, 弹性模量 ($乙$) 和断裂伸长率 (${\epsilon }_b$) 影响满足特定应用程序功能要求的能力。问题很复杂，回收商、设计师、行业和消费者的偏好和要求相互矛盾。除了行业和消费者的容忍度以及保守的产品预期以规避这些竞争利益之外，使用巧妙设计实践的新的高价值再造粒应用对于资助新的分类和加工技术是必要的。