US4507197A Apparatus and method for producing shot free
An apparatus and dry method for de shotting shot containing mineral wool fibers wherein the fibers are treated in a granulatorpact them into entangled nodules, and the nodules are passed through an air classifier to open up and de shot them. In a preferred embodiment, a felted layer of mineral wool is subjected to a first granulation step to divide the layer into a multiplicity of



































