Nonwoven fibrous insulation material
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Apr 8, 1985
filing date -
Apr 8, 1985
priority date (Note) -
Expired
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Abstract
A nonwoven composite fibrous material adaptable as an insulation medium is formed by a loose layer of inorganic fibers, such as rock wool, glass, ceramic, carbon-graphite or the like, bonded together by at least one carrier web layer positioned on a surface of the inorganic fibrous layer. The carrier web layer is a blend of inorganic fibers and organic fibers with the organic fibers comprising about 1% or less by weight of the total nonwoven composite fibrous material. Both organic and inorganic fibers of the carrier web are advanced into interlocking relation with the fibers of the inorganic layer by needle punching the carrier web. The carrier web organic and inorganic fibers have a length greater than the thickness of the inorganic layer in the composite fibrous material so that the needle punching advances organic and inorganic fibers from the carrier web completely through the inorganic layer to mechanically bind together the fibers of the inorganic layer to resist separation of the fibers and delamination of the inorganic layer upon handling and installation.
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