Gasket, method of manufacturing and apparatus for manufacturing same

Abstract

A gasket ( 1 ) has a gasket core ( 2 ) and an outer gasket layer ( 4 ) covering the gasket core ( 2 ). At least one of the two sealing materials that make up the gasket has two reactive components before they are extruded, with said components chemically reatcting with one another as they are combined and/or extruded. The extruded core may be formed of a two-component resin which is at least one of an elastomer and a foam. The flexible outer layer may be a synthetic resin which is at least one of an elastomer and a foam. The outer layer may be electrically conductive, ultra-violet resistant, or resistant to the environment in which the gasket is to operate. Also taught are methods of apparatus for the manufacture of such gaskets

1 - 44 . (canceled)  
   
   
       45 . An apparatus for the manufacture of a seal comprising: 
 a nozzle head having a feeding side and an outgoing side; an inner nozzle arranged within the nozzle head for feeding a first sealing material; an outer nozzle arranged within the nozzle head for feeding a second sealing material, wherein the outer nozzle at least partially, coaxially encloses the inner nozzle.    
   
   
       46 . The apparatus according to  claim 45  wherein the nozzle head further comprises a first borehole, wherein the inner nozzle is coaxially inserted into the first borehole, wherein the inner diameter of the first borehole is larger than the outer diameter of the inner nozzle, and the outer nozzle is inserted into the first borehole.  
   
   
       47 . The apparatus according to  claim 46  further comprising a second borehole connected to the side of the first borehole.  
   
   
       48 . The apparatus according to  claim 45  further comprising a detachable first insert connected to the inner nozzle, wherein the inner nozzle and the detachable first insert can be detachably inserted from the feeding side of the nozzle head into the first borehole.  
   
   
       49 . An apparatus according to  claim 48  wherein the inner nozzle is interchangeable.  
   
   
       50 . An apparatus according to  claim 45  further comprising a detachable second insert connected to the outer nozzle, wherein the outer nozzle and the detachable second insert can be detachably inserted from the outgoing side of the nozzle head into the first borehole.  
   
   
       51 . An apparatus according to  claim 50  wherein the outer nozzle is interchangeable.  
   
   
       52 . An apparatus according to  claim 45  further comprising a first feeding passage connected to the inner nozzle to supply the first sealing material to the inner nozzle and a second feeding passage connected to the outer nozzle to supply the second sealing material to the outer nozzle.  
   
   
       53 . An apparatus according to  claim 52  further comprising a shutoff device inserted into the first feeding passage, into the second feeding passage, or both.  
   
   
       54 . An apparatus according to  claim 52  further comprising two reservoirs connected to the first feeding passage, wherein the two reservoirs hold components of the first sealing material.  
   
   
       55 . An apparatus according to  claim 52  further comprising two other reservoirs connected to the second feeding passage, wherein the two other reservoirs hold components of the second sealing material.  
   
   
       56 . An apparatus according to  claim 54  further comprising a first mixer connected between the first passage and the two reservoirs, wherein the components of the first material are mixed in the first mixer.  
   
   
       57 . An apparatus according to  claim 55  further comprising a second mixer connected between the second passage and the two other reservoirs, wherein the components of the second material are mixed in the second mixer.