Shell for ballistic helmet

Abstract

A shell for ballistic helmet formed from a plurality of paraaramide fabric layers such as KEVLAR-KM2®, and bonding resin. All fabric layers have areal density less than 200 g/m 2 , preferably part of them have areal density less than 160 g/m 2 . The number of paraaramide layers is greater than 28, preferably 38 and more. The bonding resin constitutes less than 12% of the shell weight. The shell has average thickness less than 6.5 mm and average areal density less than 7.5 Kg/m 2 . A method for the production of such shells includes pressing and bonding the plurality of layers at pressure equal to or above 150 Kg/cm 2 , preferably above 300 Kg/cm 2 .

1 . Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin,
 wherein said fabric layers have areal density equal or less than 200 g/m 2 , said shell has average thickness less than 6.5 mm and average areal density less than 7.5 Kg/m 2 .   
   
   
       2 . Shell according to  claim 1 , wherein at least one of said fabric layers has areal density less than 160 g/m 2 . 
   
   
       3 . Shell according to  claim 1 , wherein a first part of said fabric layers have areal density less than 160 g/m 2  and a second part of said fabric layers have areal density between 200 and 160 g/m 2 . 
   
   
       4 . (canceled) 
   
   
       5 . Shell according to  claim 1 , wherein said bonding resin constitutes less than 12% of the shell weight. 
   
   
       6 . Shell according to  claim 1 , wherein said plurality of layers is greater than 28. 
   
   
       7 . Shell according to  claim 6 , wherein said plurality of layers is not less than 33. 
   
   
       8 . Shell according to  claim 7 , wherein said plurality of layers is not less than 38. 
   
   
       9 . Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said plurality of layers is greater than 28 and said shell has average thickness less than 6.5 mm. 
   
   
       10 . Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said plurality of layers is not less than 38. 
   
   
       11 . Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said fabric layers have areal density less than 200 g/m 2 , and said plurality of layers is greater than 28. 
   
   
       12 . Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said plurality of layers is greater than 28 and said shell has average areal density less than 7.0 Kg/m 2 . 
   
   
       13 . Method of producing a ballistic helmet shell as defined in  claim 12 , the method including the step of pressing and bonding of said plurality of layers at a pressure equal to or above 150 Kg/cm 2 . 
   
   
       14 . Method according to  claim 12 , wherein said pressure is equal or above 300 Kg/cm 2 .