CEGI - Book Chapters

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Browsing CEGI - Book Chapters by Author "Elsa Marília Silva"
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    The cutting stock problem: A case study in a manufacturer of pet vivaria
    ( 2015) Sousa,C ; Elsa Marília Silva ; Lopes,M ; António Galrão Ramos
    This paper addresses the problem of determining the cutting patterns of metal sheets, which arises in a manufacturer of metal cages, in order to minimize the waste, the number of cuts performed, the number of metal sheets used or a weighted combination of the three. A two stage approach, to solve a 2D guillotine cutting stock problem with single and multiple stock sizes, is presented and compared with the company approach and state-of-the-art algorithms. The results show great improvement compared to the company approach and a very good performance compared to state-of-the-art algorithms.
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    Integrated cutting and production planning: A case study in a home textile manufacturing company
    ( 2015) Elsa Marília Silva ; Viães,C ; José Fernando Oliveira ; Maria Antónia Carravilla
    In this paper we consider the problem of minimizing the waste of textile material in a Portuguese home textile manufacturing company. The company has a vertical structure covering the different production stages of the home textile, from weaving until the finished products. Production planning comprises different decisions: the definition of the widths and lengths of the fabric rolls to be produced, the number of fabric rolls to be used from stock or purchased and the definition of the cutting patterns to be applied to each width of the fabric roll, so that the waste is minimized. We propose a MIP model, solved by a column generation method, to tackle the problem.