Patent ID: 7594618

Claim:
A method of producing just-installed thermal or acoustical insulation in one or more cavities of a structure comprising inorganic fibrous insulation, the just-installed insulation having a moisture content of less than about 5 weight percent, based on the dry weight of the just-installed insulation, the method comprising; a) feeding clumps, nodules, or mixtures thereof of mineral fiber insulation thereof into a blowing machine whereby the mineral fiber insulation is suspended in an air stream to form an air suspension of the clumps, nodules, or mixtures thereof and blowing said air suspension into and through a hose connected to the blowing machine, an exit of the hose attached to a nozzle system comprising a shredder section and an accelerator section, b) passing the air suspension of clumps, nodules, or mixtures thereof through a shredder of the shredder section located down stream of the hose to produce a moving air suspension containing mineral insulation pils, the majority of the pils having a diameter of less than about 0.15 inch. c) accelerating said suspension containing mineral insulation pils through the accelerator section located downstream of the shredder section to increase the velocity of said air suspension containing mineral insulation pils by at least about 10 percent, compared to the velocity of the air suspension containing the mineral insulation pils before said accelerating, to form a stream and d) directing the stream, into the one or more cavities causing most of the pils to stick to one or more walls of one or more cavities or to each other to form the just-installed thermal or accoustical insulation.