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Integrated Pulp and Paper Mill Planning and Scheduling
Maristela Oliveira dos Santos; B. Almada-LoboThis article describes a real-world production planning and scheduling problem occurring at an integrated pulp and paper mill (P&P) which manufactures paper for cardboard out of produced pulp. During the cooking of wood chips in the digester, two by-products are produced: the pulp itself (virgin fibers) and the waste stream known as black liquor. The former is then mixed with recycled fibers and processed in a ...
Single and Parallel Machine Capacitated Lotsizing and Scheduling: New Iterative...
Ross James; B. Almada-LoboWe propose a general-purpose heuristic approach combining metaheuristics and Mixed Integer Programming to find high quality solutions to the challenging single- and parallel-machine capacitated lotsizing and scheduling problem with sequence-dependent setup times and costs. Commercial solvers fail to solve even medium-sized instances of this NP-hard problem, therefore heuristics are required to find competitive ...
Capacitated lot-sizing and scheduling with sequence-dependent, period-overlappi...
António Menezes; Alistair Clark; B. Almada-LoboIn production planning, sequence dependent setup times and costs are often incurred for switchovers from one product to another. When setup times and costs do not respect the triangular inequality, a situation may occur where the optimal solution includes more than one batch of the same product in a single period—in other words, at least one sub tour exists in the production sequence of that period. By al...
Lead time considerations for the multi-level capacitated lot-sizing problem
Christian Almeder; Diego Klabjan; B. Almada-LoboThe classical multi-level capacitated lot-sizing problem is often not suitable to correctly capture resource requirements and precedence relations. We tackle this issue by explicitly modeling these two aspects. Two models are presented; one considering batch production and the other one allowing lot-streaming. Comparisons with traditional models demonstrate the capability of the new approach to deliver more rea...
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