. Observe the particular event for instance 2, which is infeasible for the GLSP model, while this instance is feasible for the proposed model and the solution provided is optimal. As it frequently happens in the company, the demand could not fully meet considering only those molding patterns usually used by the planners, so that it may be advantageous to consider many possibilities for producing products (i.e. possible molding patterns) as possible. It evidences that besides to the possibility of getting sub-optimal solutions, we may not find feasible solutions for some instances by supporting the production planning decisions on just a sub-set of molding patterns.