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Sound absorbing structural element
| Details |
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Inventors: H/a/ eseker, Willy; Vignal, Robert; Ferrand, Guy;
Assignee: Matec Holding AG (Kusnacht, CH)
Primary Examiner: Van Balen; William J.
Assistant Examiner:
Attorney, Agent or Firm: Lavine; Irvin A.
A sound insulating panel is provided having a support layer of honeycomb material, and a pair of covering layers, at least one of which is air-permeable. The support, honeycomb layer has a compressive strength greater than the compressive strength of each of the covering layers, in a direction transverse to the faces thereof, and has a tensile strength which is lesser, in the general direction parallel to the faces, than that each of the covering layers. The support layer is compacted over a part of its extent to a substantially closed layer of reduced thickness, this being, preferably, in the region of the border. A method of making an insulating construction element as described. |
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DETAILED DESCRIPTION We claim: 1.
A sound-absorbing self-supporting roof-liner for the sheet metal roofs of automotive vehicles comprising a support layer having covering layers on each of its two outer faces, at least one said covering layer being permeable to air, the support layer being an open-cell honeycomb structure of impregnated cardboard or craft paper with cells extending substantially traversely to the faces, a said air permeable layer comprising a nonwoven resin-bonded fibrous felt, one said layer being a decorative layer of textile material or porous PVC foil, said support layer together with its covering layers moulded to the contours of the sheet metal of a vehicle roof and compacted and shaped to less than the support layer thickness over a considerable part of its surface area thereby to conform to the functional shape of the surface facing the passenger compartment.
2.
A sound-absorbing self-supporting roof-liner according to claim 1, wherein the edge the support layer is completely compacted.
3.
A sound-absorbing self-supporting roof-liner according to claim 1, and in combination therewith, an automobile roof formed of a plate, said automobile roof being of contoured, non-planar configuration, said roof-liner bonded thereto, whereby to dampen noise-producing bending oscillations of the roof plate and to absorb sound generated within the automobile.
Description:
The present invention relates to a self-supporting, generally flat construction element, containing a support layer, on each of the two external faces of which a covering layer is disposed.
Light and stiff panels of composite material are known and are commercially available, consisting of a honeycombed or undulating lightweight layer, which are connected with two foils of materials, such as kraft paper, chipboard, wood cement panels, aluminium sheet or steel sheet etc.
Such elements are used, for example, as Palette floors, Door fillings, Lightweight wall elements (prefabricated construction), Packaging material
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Vibration and Earthquake Isolation 
