Method For The Production Of A Sound Insulation Molding With Mass And Spring

Abstract

The invention relates to a method of producing a sound insulation molding with mass ( 2 ) and spring ( 3 ), wherein both mass ( 2 ) and spring ( 3 ) are produced on the basis of the same material, in particular polyurethane. For the formation of a mass, reaction substances and fillers are brought into a mold, in particular sprayed in or injected, and brought to reaction. The spraying in or injection is thereby controlled such that the reaction substances and the fillers are supplied in locally different quantity and/or composition into the mold, dependent upon the sound damping to be locally achieved together with the spring, which is then formed on the so-formed mass ( 2 ) in the same mold through formation of foam. Through this, with surfaces to be sound insulated which are of the same geometry, three-dimensional moldings ( 1 ) of the same geometry can be produced with both different acoustic and also mechanical behavior in predetermined series.

1 .- 13 . (canceled) 
     
     
         14 . Sound insulation comprising:
 a sound insulation molding to sound insulate a surface that requires different sound damping in different regions, the sound insulation molding comprising a mass of foam and a spring of foam formed of a same material;   wherein the mass includes a content of filler;   wherein the spring includes a content of filler which is less than the content of filler of the mass;   wherein the mass has two layers that each vary in thickness and/or composition;   wherein the mass has a weight per unit area of 1 kg/m 2  to 4.5 kg/m 2  at thicknesses of 0.5 mm to 10 mm; and   wherein the spring has a lower weight per unit area than the mass due to the lower content of filler.   
     
     
         15 . The sound insulation of  claim 14  wherein:
 the two layers of the mass comprise a first layer and a second layer; and 
 the first layer provides a carrier layer; and 
 the second layer is locally applied to the first layer. 
 
     
     
         16 . The sound insulation of  claim 14  wherein:
 the two layers of the mass are each formed with reaction substances. 
 
     
     
         17 . The sound insulation of  claim 14  wherein:
 the two layers of the mass are each formed with a quantity of filler; and 
 the quantity of filler for each layer is different. 
 
     
     
         18 . The sound insulation of  claim 14  wherein:
 the mass and the spring are each formed of polyurethane material. 
 
     
     
         19 . The sound insulation of  claim 14  wherein:
 the two mass layers that each vary in thickness and/or composition vary in thickness and/or composition to vary local acoustic and mechanical characteristics. 
 
     
     
         20 . The sound insulation of  claim 14  wherein:
 the spring is molded to the mass. 
 
     
     
         21 . The sound insulation of  claim 14  wherein:
 the mass is formed against a decorative part. 
 
     
     
         22 . The sound insulation of  claim 14  wherein:
 the sound insulation molding is to dampen sound of a motor vehicle. 
 
     
     
         23 . The sound insulation of  claim 22  wherein:
 the sound insulation molding is to be used between an engine compartment and a passenger space of a motor vehicle. 
 
     
     
         24 . A motor vehicle molding comprising:
 a sound insulation molding to sound insulate a surface of a motor vehicle that requires different sound damping in different regions, the sound insulation molding comprising a mass of foam and a spring of foam formed of a same material;   wherein the mass includes a content of filler;   wherein the spring includes a content of filler which is less than the content of filler of the mass;   wherein the mass has two layers that each vary in thickness and/or composition;   wherein the mass has a weight per unit area of 1 kg/m 2  to 4.5 kg/m 2  at thicknesses of 0.5 mm to 10 mm; and   wherein the spring has a lower weight per unit area than the mass due to the lower content of filler.   
     
     
         25 . The molding of  claim 24  wherein:
 the two layers of the mass comprise a first layer and a second layer; and 
 the first layer provides a carrier layer; and 
 the second layer is locally applied to the first layer. 
 
     
     
         26 . The molding of  claim 24  wherein:
 the two layers of the mass are each formed with reaction substances. 
 
     
     
         27 . The molding of  claim 14  wherein:
 the two layers of the mass are each formed with a quantity of filler; and 
 the quantity of filler for each layer is different. 
 
     
     
         28 . The molding of  claim 24  wherein:
 the mass and the spring are each formed of polyurethane material. 
 
     
     
         29 . The molding of  claim 24  wherein:
 the two mass layers that each vary in thickness and/or composition vary in thickness and/or composition to vary local acoustic and mechanical characteristics. 
 
     
     
         30 . The molding of  claim 24  wherein:
 the spring is molded to the mass. 
 
     
     
         31 . The molding of  claim 24  wherein:
 the mass is formed against a decorative part. 
 
     
     
         32 . The molding of  claim 24  wherein:
 the sound insulation molding is adapted to be used between an engine compartment and a passenger space of a motor vehicle.