Toward Sustainable Remanufacturing Systems: Integrating Inspection Allocation, Carbon Pricing, And OEM-ODM Coordination
This study develops a mixed-integer nonlinear programming model to optimize inspection allocation and OEM-ODM coordination under carbon pricing, demonstrating through numerical simulation that a self-remanufacturing configuration significantly outperforms an outsourced decentralized model by reducing total production costs and rejected units.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
In the modern economy, a growing number of companies are turning to a strategy called remanufacturing. Instead of throwing away old products and making entirely new ones from scratch, they take used items back, take them apart, and restore them to a condition as good as new. This process is a cornerstone of the circular economy, a system designed to keep materials in use for as long as possible, reducing the need to dig up raw resources and cutting down on the waste that ends up in landfills. However, bringing an old product back to life is far more complicated than building a new one. Used items arrive in unpredictable shapes and conditions; some are barely damaged, while others are worn out. To ensure these restored products are safe and reliable, manufacturers must inspect them at various stages of the repair process. At the same time, governments around the world are introducing carbon pricing, a system that charges companies for the pollution they create, forcing them to think carefully about the environmental cost of every step they take. The challenge for industry leaders is to figure out how to balance the cost of these inspections, the price of pollution, and the complex relationships between different companies in the supply chain to make this green approach actually work.
A team of researchers from the Institut Teknologi Sepuluh Nopember in Indonesia set out to solve this puzzle by building a detailed computer model of a remanufacturing system. They focused on a specific question: does it make more sense for a brand owner to handle the entire restoration process themselves, or should they hire a separate company to do the work? To find the answer, they created two different scenarios. In the first scenario, known as the self-remanufacturing model, a single company, called the Original Equipment Manufacturer, manages everything. They collect the used products, inspect them, repair them, and sell the finished goods, making all the decisions in one place. In the second scenario, the outsourcing model, the brand owner makes only new products and hires a third-party designer, called an Original Design Manufacturer, to handle the difficult task of restoring the used ones. In this setup, the two companies operate independently, each trying to maximize their own profits while paying their own share of the carbon taxes.
The researchers fed their model with real-world data from the professional kitchen appliance industry, a sector where heavy-duty equipment like commercial ovens and mixers has a long life and is ideal for being taken apart and fixed. They simulated how these systems would perform under different conditions, testing various levels of product quality and carbon pricing. The results were striking. In every single test case, the company that kept the entire process in-house performed significantly better than the one that outsourced the work. When the brand owner managed the restoration themselves, the total cost to produce the goods was approximately 19,727.93 US dollars. In contrast, when they hired a separate company to do the remanufacturing, the cost skyrocketed to 52,916.07 US dollars. The difference was not just about money; it was also about quality and waste. The self-managed system produced only 3.84 rejected units—items that were too damaged to be fixed and had to be thrown away. The outsourced system, however, generated 23.52 rejected units, meaning it wasted far more material and effort.
The reason for this gap lies in how information flows and how decisions are made. When a single company controls the entire process, it has immediate access to the condition of every used item that comes in. It can decide exactly where to place inspection stations along the assembly line to catch defects early, preventing workers from wasting time and energy trying to fix something that cannot be saved. This tight coordination allows the company to optimize its use of carbon allowances and raw materials. In the outsourced model, the two companies are separated. The brand owner does not know the specific condition of the cores the third party is working on, and the third party does not have the full picture of the brand's overall goals. This lack of shared information leads to inefficiencies. The third party, trying to protect its own interests, may not inspect as carefully or as strategically as the brand owner would, leading to more defective products moving down the line and more carbon emissions from unnecessary work.
The study suggests that while outsourcing might seem like a way to save money by letting specialists handle the hard work, it actually creates hidden costs in the form of wasted resources and higher pollution fees. The researchers found that the self-managed approach allowed the company to produce more remanufactured goods while using fewer new materials, which is the ultimate goal of sustainability. By keeping the decision-making power centralized, the company could better balance the trade-off between the cost of inspecting a product and the cost of the pollution generated by fixing it. The findings indicate that for industries dealing with complex, high-value products, the most effective path toward a sustainable future is not to split the work between different companies, but to integrate the inspection, repair, and carbon management strategies into a single, unified system. This approach ensures that every step of the process is aligned, turning the challenge of variable product quality into a manageable part of a cleaner, more efficient production cycle.
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