Electric driving in the paper mill, on heat-economy lines

The various uses for which steam is required in paper manufacture are first discussed. Then follow particulars of the various classes of machinery to be driven, and comments on the selection of suitable electrical gear. The heating requirements for heat economy, and the various types of power plant by which this can be attained are discussed in detail, together with recommendations on how each type of plant will be used for the different types of paper mills. The utilization of existing prime movers on ¿heateconomy¿ lines is specially shown. The factors governing the choice of electric supply are then dealt with. Finally, the driving of the variable-speed end of the paper machine proper is discussed in detail. The requirements for a successful drive are first enumerated, then various means of attaining that drive, not only with a single motor, but alternatively with several motors, both electrically and mechanically interlocked, are investigated. A Table at the conclusion of the paper gives particulars of machines which have been converted for electrical working in the United Kingdom, and the total number of machines in the country.