目的 利用GB 9687—1988《食品包装用聚乙烯成型品卫生标准》国家标准鉴别聚乙烯成型品中聚乙烯废旧料的含量。方法 选用高密度（HDPE）聚乙烯、低密度（LDPE）聚乙烯混合料为主要原料，其中掺杂8种不同比例的回收料，经吹塑加工成成型品后，分别进行感官指标、蒸发残渣、高锰酸钾消耗量、重金属及脱色试验。结果 废旧料添加质量分数从0逐渐增大至100%时，制品色泽逐渐由白色变成咖啡色，蒸发残渣含量逐渐降低。结论 当废旧料添加质量分数大于30%时，可通过感官指标中色泽辨别产品中是否添加废旧料。建议在GB 9687—1988《食品包装用聚乙烯成型品卫生标准》中量化感官指标，同时增加荧光增白剂项目。

The work aims to identify polyethylene recycling plastics in polyethylene products by GB 9687—1988 Hygienic Standard for Polyethylene Products Used as Food Containers and Tablewares. Eight kinds of different proportions of the recycled materials were mixed into the mixture of high density polythene (HDPE) and low density (LDPE) used as main raw materials. After blow molding and forming, sensory index test, evaporate test, potassium permanganate consumption test, heavy metal (by Pb) test and decolorization test were carried out respectively. When recycling plastics additive amount increased from 0% (mass fraction) to 100%, the color of product changed from white to brown, and evaporation residue gradually reduced. In conclusion, when recycling plastics additive amount exceeds 30%, recycling plastics can be identified by color in sensory index test. It is advised to increase quantitative sensory index and fluorescent whitening agent index in GB 9687—1988 Hygienic Standard for Polyethylene Products Used as Food Containers and Tablewares.