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 part of said fabric layers have areal density less than 160 g/m 2  and the rest fabric layers have areal density between 200 and 160 g/m 2 .  
   
   
       4 . Shell according to  claim 2 , wherein part of said paraaramide fabric layers are KEVLAR-KM2®.  
   
   
       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 for production of shell for ballistic helmet according to anyone of the preceding claims, including pressing and bonding of said plurality of layers at pressure equal or above 150 Kg/cm 2 .  
   
   
       14 . Method according to  claim 12 , wherein said pressure is equal or above 300 Kg/cm 2 .