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Nonwoven fibrous insulation material

  • US 4,847,140 A
  • Filed: 04/08/1985
  • Issued: 07/11/1989
  • Est. Priority Date: 04/08/1985
  • Status: Expired due to Fees
First Claim
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1. 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.

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