Method of producing a sound-absorbent insulating element and insulating element produced according to this method
AssigneeRieter Automotive (International) AG
InventorEvelyn Zwick
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Abstract
The invention relates to a method of producing a sound-absorbent insulating element with at least two metallic leaves or sheets (2, 3) in the form of films or sheets. According to said method, at least one of said elements is provided with knobs in such a manner that the limit of elasticity of the respective sheet (2, 3) is exceeded during the knobbing process, resulting in the formation of fissures (4, 11). Said fissures substantially help to improve the acoustic absorption capacity of the insulating element produced according to the inventive method.
Claims12
Method of producing a sound-absorbing insulating element, having at least two metallic sheets in the form of foils or metal sheets, of which at least one is embossed, and said sheets being joined and formed together, wherein at least one fissured sheet (2) is produced when, during embossing, the material of the at least one metallic sheet is overstretched to such an extent that fissures (4) are created.
Dependencies are inferred from the claim text.