초록 ▼

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 carrie

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.

대표청구항 ▼

A nonwoven composite fibrous material comprising: a discrete layer consisting essentially of inorganic fibrous material containing fibers in an unbonded state; at least one discrete nonwoven carrier web positioned on a surface of said discrete layer of said inorganic fibrous material; said discrete

A nonwoven composite fibrous material comprising: a discrete layer consisting essentially of inorganic fibrous material containing fibers in an unbonded state; at least one discrete nonwoven carrier web positioned on a surface of said discrete layer of said inorganic fibrous material; said discrete nonwoven carrier web including an admixture of inorganic fibers and organic fibers; said inorganic fibers and said organic fibers of said nonwoven discrete carrier web being blended in a nonwoven structure with a preselected thickness and density with said organic fibers of said discrete carrier web comprising about 1% or less by weight of said composite fibrous material; and said nonwoven discrete carrier web being needle punched to said discrete layer of said inorganic fibrous material to interlock said inorganic fibers and said organic fibers of said carrier web with said fibers of said layer of inorganic fibrous material so as to bond together said fibers of said inorganic fibrous material and form said nonwoven composite fibrous material which is cohesive and has a mechanical strength and flexibility to resist separation of said fibers of said layer of said inorganic fibrous material upon handling.