Document 1ggy10VQbJm9EqaGpm2Ogdr4d

The above graphic illustration shows how mineral wool manufacturers bake a big layer cake of alternate layers of coke and rock or slag, and by the magic of industrial chemistry change the material into fluffy wooldike strands. The line rut below shows how raw materials are mixed and the rarious steps in making glass wool. THE MANUFACTURE OF MINERAL WOOL- ROCK, SLAG AND GLASS The drawing at the top of the page appeared in the May issue of Esso Oilways and illustrates the manufacturing process by which rock or slag is trans formed into Mineral Wool. Below isa diagram or flow-sheet giving in detail the method by which silica sand, lime stone and other mineral ingredients are treated to produce Mineral Wool from glass. All processes by which Mineral Wool insulation is now being manufactured have been greatly improved of recent years and the modern pioduct is the perfected result of carefully controlled processing. One important phase of the process hy which rock or lag is made into Mireral Wool involves the use of a cupola. This is a cylindricallv shaped melting furnace into which are loaded alternate U>et- of raw material and coke. At the bottom, the molten mass is allowed to flow down ward out of an opening directly into the path of jeU of steam by means of which it is resolved into a shower of glowing particles. These develop into wool-like fibres during their trip through the air and, falling upon an endless screen conveyor, are slowly carried along for further processing into batta, blankets and granulated form. In the lower diagram the machinery for weighing, mixing and producing Mineral Wool from glass is shown. From the bottom of the forming cham ber the Mineral Wool is delivered for immediate packing or for additional fabrication into butts, blankets or granu lated form. 1946 13