Abstract: A machine for forming blocks of fibrous insulation from a continuous fibrous blanket. These folded blocks may be used in furnace linings or the like. A pair of oscillating folder vanes form folds which extend in alternating directions. The vanes are oscillated by a continuously driven motor through a crank linkage. A reciprocating support vane engages the newly formed folds and supports them while the folder vanes are being disengaged from the blanket. A feeder drum and bearing member co-act to form a material supply loop from which the folds are made. The same motor drives all moving parts making the controls simple and inexpensive.

Abstract: A thermal insulation device is described comprising a modular or block insulation composed of at least two layers of serpentine folded fibrous insulating blankets with the layers of blankets being secured by means of extended folds of the hot face layer being interengaged with folds of the cold face layer, with the cold face layer then being separately secured to attachment means for mounting the block on the wall, ceiling, door or other surface of a furnace, kiln or like structure. The layers of fiber are commonly composed of fibers of different compositions, with the more thermally resistant fiber comprising the outer or hot face layer and the less thermally resistant composition comprising the inner or cold face layer.