Abstract
In an integrated pulp and papermill, all subprocesses are interrelated. This means that they cannot always be run at the optimum production level, since the result as a whole is decisive. The production managers have for many years successfully carried out the difficult scheduling of an entire mill. With increasing complexity of a modern mill, it is desirable to help production managers more systematically to utilise existing storage capacities. Thus, a production control system has been developed for the Gruvön mill. The mathematical formulation and solution of the scheduling problem is based upon optimum control theory.
In order to perform unavoidable production changes with the minimum of disturbances, the process control must not only produce uniform quality during steady state conditions, but whenever possible carry out production changes without introducing disturbances in the quality of the product.
In order to implement computerised production and process control systems, good human relations must exist between computer staff and production personnel. This, together with good technical solutions, including the man/machine interface, will guarantee success.
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