A Fiscal and Process Controller for a Hardboard Mill

  • D. F. Pearce
  • A. W. Self


Hardboard is manufactured by feeding wood chips into a pressurised preheater (digester). The dry heated chips are separated into fibre by grinding discs (defibration) and mixed with water to form pulp. The pulp is fed into a series of chests where it is mixed with a number of chemicals and water. The pulp is then dewatered on a machine wire screen to form a wetlap. The wetlap is pressed and heated to form hardboard sheets. A plant diagram is shown in Figure 1.


Fibre Quality Smith Predictor Flow Valve Board Type Flow Control System 
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  1. 1.
    Singh A. & McEwen D.H. “The Control of a Process Having Appreciable Transport Lag — A Laboratory Case Study”, IEEE Trans, on Indust. Electron. Control Instrument. Vol. IECI, pp. 396–401, 1975.Google Scholar
  2. 2.
    Pearce D.F. and Self A.W. A multi-structured controller for a Hardboard mill. Fifth International Conference on Production Research. Huddersfield Polytechnic. September 1989.Google Scholar
  3. 3.
    Norberg K. and Black E. “Effect of Refining on Strength Properties of Press Dried Hard and Semi-hard Fibre Building Board”, Svensk Papperstidning 72: 649–655, 1969.Google Scholar
  4. 4.
    Short P. Woodson G. and Lyon D. “Dry Chips versus Green Chips as Furnish for Medium-density Fibreboard”, Forestry Products Journal, 28(3) 33–37, 1978.Google Scholar
  5. 5.
    Awcock G.J. Robinson N.J. Self A.W. and Thomas R. “The Application of a Low-Cost Vision System to Grading Wood Fibre for the Board Manufacturing Industry”, IEE Colloquium, 1988.Google Scholar

Copyright information

© Kogan Page Ltd. 1989

Authors and Affiliations

  • D. F. Pearce
    • 1
  • A. W. Self
    • 1
  1. 1.Brighton PolytechnicUK

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