SYSTEM FOR MAINTAINING CONSTANT THE DRY MATERIAL FLOW TO A SHEET MATERIAL MANUFACTURING MACHINE

摘要

The stockline valve of a paper making machine is regulated by comparing by means of a digital computer successive readings of the consistency of the paper pulp carried by a water carrier. Any resultant difference between such readings is converted to analog information and coupled to the set point of an analog flow control unit which is responsive to the actual flow rate to control the stock valve. The digital computer will perform changes of the flow controller set point in such a manner that the product of consistency and flow set point is constant. This provides control of the pulp flow in the line.