Impact of shelf life on the trade-off between economic and environmental objectives: A dairy case
Impact of shelf life on the trade-off between economic and environmental objectives: A dairy case
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DOI：
10.1016/j.ijpe.2018.04.009
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发表时间：
2018-07
影响因子：
12
通讯作者：
Bryndis Stefansdottir;Verena Depping;M. Grunow;U. Kulozik
中科院分区：
文献类型：
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作者：
Bryndis Stefansdottir;Verena Depping;M. Grunow;U. Kulozik
食品制造商引入了更加环保的工艺来解决日益增长的可持续性问题。然而，这些过程通常会缩短产品的保质期，从而将销售推迟到未来价格更高的时期。我们开发了一个框架来分析保质期对两类乳制品经济和环境绩效之间权衡的影响。由于保质期的差异在战术规划层面具有关键影响，因此我们为此聚合层面开发了一个优化模型。其目标反映利润和相关环境指标。滚动期限方案用于处理价格不确定性，使用欧洲期货交易所期货作为价格预测指标。我们的框架使用这些战术规划结果来做出产品和流程选择的战略决策。现实生活中的案例研究将传统奶粉与新型浓缩奶进行了对比。浓缩物在加工过程中需要较少的能量，但保质期较短。结果表明，粉末的潜在利润效益高达 34.5%。然而，保质期的这种经济价值取决于先验的完美价格知识。如果使用期货作为价格预测指标，那么保质期的价值就会减少到只有 1.1%。因此，保质期的经济价值并不是反对用更环保的浓缩物替代粉末的有力论据。我们还表明，利润和富营养化潜力这两个目标足以在这种情况下进行权衡。确定了几种产品组合，它们省略了粉末，并且在利润和环境方面表现良好。
Food manufacturers introduce more environmentally friendly processes to account for increasing sustainability concerns. However, these processes often go along with a reduction of product shelf life, limiting the delay of sales to future periods with higher prices. We develop a framework to analyze the impact of shelf life on the trade-off between economic and environmental performance of two types of dairy products. Since the differences in shelf life have their key impact at the tactical planning level, we develop an optimization model for this aggregation level. Its objectives reflect profit and relevant environmental indicators. A rolling horizon scheme is used to deal with price uncertainty, using Eurex futures as price predictors. Our framework uses these tactical planning results for strategic decisions on product and process selection. A real-life case study contrasts traditional milk powders against novel milk concentrates. Concentrates require less energy in processing, but have a shorter shelf life. Results show that powders offer a potential profit benefit of up to 34.5%. However, this economic value of shelf life is subject toa prioriperfect price knowledge. If futures are used as price predictors, the value of shelf life is reduced to only 1.1%. The economic value of shelf life is therefore not a strong argument against the substitution of powders with more environmentally friendly concentrates. We also show that two objectives, profit and eutrophication potential, are sufficient to capture trade-offs in the case. Several product mixes are determined that omit powders and perform well with regard to profit and environment.