Goal: The main purpose of this work is to develop several production planning models for one of bottle grade PET production plants (in Turkey) under different scenarios by considering different levels of inventory (no stock and different levels of safety stocks), different energy sourcing alternatives (natural gas/coal or both) and production throughput (different lot sizes). Design/Methodology/Approach: Deterministic multi-product multi-period single level mixed integer linear programming model is presented. The model is implemented for the above defined scenarios. We have also considered the total emission produced for different energy alternatives. Results: The models for the different scenarios have shown that significant performance improvements can be achieved by changing the parameters/policies of the production. The best model obtained has yielded 6.6% of profit improvement and 6.9% of cost reduction. Limitations of the investigation: Planning horizon of this work could cover the data of years 2014 to 2018. However, the actual data employed for this study is limited with one year due to unavailability of further data. In addition to this, improvement of current production planning approach of the plant by implementation of proposed model is one of the objectives of this study to see success rate of model. Though, this couldn’t be realized. We hypothetically tested the improvement provided by the proposed model, therefore we can’t analyze the actual improvement. Practical implications: Interactions among optimal results obtained by running model with different scenarios and their effect on selected performance variables are the main contribution of this work. Similar methodology could be used at other PET resin manufacturing plants or alternatively the production facilities having similar type of continuous manufacturing processes to find their optimal levels of inventory, production throughput and proper choice for energy sourcing alternative. Originality/Value: The research on the production planning for PET resin industry by considering the different scenarios (levels of inventory / energy sourcing alternatives/ production throughput) is novel as far as we know, and therefore the approach used in this study is expected to be useful for other similar plants.

中文翻译：

---

评估 PET 树脂生产厂的生产计划政策备选方案：土耳其案例研究

目标：这项工作的主要目的是通过考虑不同的库存水平（无库存和不同的安全库存水平）、不同的能源来源，为一个瓶级 PET 生产厂（土耳其）在不同情景下开发几种生产计划模型替代品（天然气/煤或两者兼有）和产量（不同批量）。设计/方法/方法：提出了确定性多产品多周期单级混合整数线性规划模型。该模型是针对上述定义的场景实现的。我们还考虑了不同能源替代品产生的总排放量。结果：不同场景的模型表明，通过更改生产的参数/策略可以实现显着的性能改进。获得的最佳模型产生了 6.6% 的利润改善和 6.9% 的成本降低。调查的局限性：这项工作的规划范围可以涵盖 2014 年至 2018 年的数据。但是，由于无法获得更多数据，本研究使用的实际数据仅限于一年。除此之外，通过实施所提出的模型来改进工厂当前的生产计划方法是本研究的目标之一，以了解模型的成功率。虽然，这无法实现。我们假设测试了所提出模型提供的改进，因此我们无法分析实际改进。实际影响：通过在不同场景下运行模型获得的最佳结果之间的相互作用及其对所选性能变量的影响是这项工作的主要贡献。类似的方法可以在其他宠物树脂制造工厂使用，或者是具有相似类型的连续制造工艺类型的生产设施，以找到其最佳库存水平，生产吞吐量和适当的节能选择。独创性/价值：据我们所知，考虑不同情景（库存水平/能源采购替代品/生产吞吐量）对 PET 树脂行业生产计划的研究是新颖的，因此本研究中使用的方法有望对其他类似植物有用。类似的方法可以在其他宠物树脂制造工厂使用，或者是具有相似类型的连续制造工艺类型的生产设施，以找到其最佳库存水平，生产吞吐量和适当的节能选择。独创性/价值：据我们所知，考虑不同情景（库存水平/能源采购替代品/生产吞吐量）对 PET 树脂行业生产计划的研究是新颖的，因此本研究中使用的方法有望对其他类似植物有用。类似的方法可以在其他宠物树脂制造工厂使用，或者是具有相似类型的连续制造工艺类型的生产设施，以找到其最佳库存水平，生产吞吐量和适当的节能选择。独创性/价值：据我们所知，考虑不同情景（库存水平/能源采购替代品/生产吞吐量）对 PET 树脂行业生产计划的研究是新颖的，因此本研究中使用的方法有望对其他类似植物有用。