Abstract
At a newsprint mill, the running of the groundwood min is connected with the running of the papermill in several ways by the pulp and whitewater systems and by the supply of electric power. For controlling the groundwood mill in a way that a high and uniform pulp quality is maintained and an optimum use of machinery and resources is made, the groundwood mill crew must continuously supervise this complex system . This is beyond human ability with the limited implements that the crew often has at its disposal . Studies performed at the Hallstavik newsprint mill have shown the limits of human ability in this respect.
In order to give the crew an improved implement, an on-line process computer has therefore been installed in the groundwood mill at Hallsta papermill. The objects of the computer system are planning the production of groundwood pulp and consumption of electric power for a coming weekly period, supervising and controlling the pulp and whitewater system for the entire mill and, finally, reporting.
Owing to these points, the main intention was to reach a more steady running condition of the groundwood mill and improved utilisation of the contract of purchased electric power.
The computer installation, including programs, was completed in autumn 1968, after which test runs with the process were started.
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