Multilayered sheet insulating material for heat insulation and sound proofing

Abstract

Multilayered sheet insulating material for heat insulation and sound proofing having at least two separation layers made of flexible material, such as sheets, non-woven fabric, paper or the like, and spacer elements between the separation layers. The spacer elements are formed by spacer fibers which are oriented perpendicular to the separation layers, and at least one end of the spacer fibers is linked, e.g., by adhesive, to a separation layer. The sheet insulating material also includes supporting fibers arranged between the separation layers and proximate the spacer fibers for supporting the spacer fibers. The sheet insulating material has very good insulating properties, a particularly low weight and high flexibility.

What is claimed is:  
     
         1 . A multilayered sheet insulating material for heat insulation and sound proofing comprising: 
 at least first and second separation layers made of a flexible material, each of said first and second separation layers having an upper and lower surface whereby said upper surface of said first separation layer faces said lower surface of said second separation layer; and    spacer fibres adhesively bonded to said upper surface of said first separation layer and extending in a direction perpendicular to said first separation layer and toward said second separation layer such that said spacer fibres contact said lower surface of said second separation layer, said spacer fibres supporting said second separation layer at a distance from said first separation layer.    
     
     
         2 . The multilayered sheet insulating material of    claim 1    further comprising supporting fibres attached to said upper surface of said first separation layer and proximate said spacer fibres for supporting said spacer fibres.