Document e7mzJ1jjEp3vNyor7vwkq4png

An exceptionally long fibred. ligntweiqnt woe.' is being mode by Spun flock Wools Ltd.. Thorold. Onf.. Canada. by resisfnnce arc lype electric furnaces. Melting rock by e/ecfric furnace and hbenzmq it by mechanical means is believed to be cn enfirefy different process from (hat in present use in the rock wool industry elsewhere Three one ton tilting furnaces are now in use al this plant. One mern con trols the operation of fhe fwo iurnaces shown above, without leaving his station, from which he actually sees the fiberization process. Furnaces are tapped and charged practically continuously. When fhe /urnaces are tiffed, moften rock impinges on a high speed disc, averaging about 4000 r.p.m.. jnd is thrown off tangentially to form fong siik like fibres. The furnaces ean be fl/fed at will to controi the width of the moften stream, and variations in disc speed influence the fibre length. Normal domestic rock wool as made by this process weighs onfy 3 lb. to the cubic foot. Output is about 212 tons per day. ROCK WOOL MADE IN ELECTRIC FURNACES AND SPUN Fiecfric furnace rock woof is coJ/ected in chambers i5 ft. square. Sturtevant fans pull the wool from the area surrounding the rotating discs and discharge fhe wool from fhe pipe above. The discharge im pmges in fhe tub ' shown with considerable force, the wool rebound ing and fhe heavier shot remaining in fhe container. Much shot is dis/rdged in pasMng through fhe fan. Rock wool is scooped up from the chamber, boxed up and stocked in this warehouse. The demand has been such lhaf rarely, if ever. :s much on hand. Four cubic feet 0/ rock woof are generally packed in a bag. For extraordinarily high or low 'emperatures. a 6 fb. per cu ft wool is sold. An unusually white wool was made and desig nated as "snow" for Christmas decorations. TANUARY. 1937 75