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The inventory-routing problem of returnable transport items with time windows and simultaneous pickup and delivery in closed-loop supply chains
مشکل موجودی مسیریابی اقلام حمل و نقل برگشت پذیر با پنجره های زمان و تحویل و تحویل همزمان در زنجیره تامین حلقه بسته-2017 Reducing environmental impact, related regulations and potential for operational benefits are the main
reasons why companies share their returnable transport items (RTIs) among the different partners of a
closed-loop supply chain. In this paper, we consider a producer, located at a depot, who has to distribute
his products packed in RTIs to a set of customers. Customers define a time window wherein the service
can begin. The producer is also in charge of the collection of empty RTIs for reuse in the next production
cycle. Each partner has a storage area composed of both empty and loaded RTI stock, as characterized by
initial levels and maximum storage capacity. As deliveries and returns are performed by a homogeneous
fleet of vehicles that can carry simultaneously empty and loaded RTIs, this research addresses a pickup
and delivery inventory-routing problem within time windows (PDIRPTW) over a planning horizon. A
mixed-integer linear program is developed and tested on small-scale instances. To handle more realistic
large-scale problems, a cluster first-route second matheuristic is proposed.
Keywords: Returnable transport item | Closed-loop supply chain | Inventory routing problem | Pickups and deliveries | Time windows |
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