Helmet containing polyethylene fibers

Abstract

An anti-ballistic helmet ( 1 ) having a shell ( 2 ) containing mono-layers of uni-directional ultrahigh molecular weight polyethylene (UHMwPE) fibers, the shell is at its rim being connected to a reinforcing profile ( 3 ).

1 . An anti-ballistic helmet having a shell containing mono-layers of uni-directional ultrahigh molecular weight polyethylene (UHMwPW) fibers, characterized that at its rim the shell is connected to a reinforcing profile. 
   
   
       2 . A helmet according to  claim 1 , wherein the shell further comprises a binder. 
   
   
       3 . A helmet according to  claim 1 , wherein the reinforcing profile is U-shaped. 
   
   
       4 . A helmet according to  claim 1 , wherein the profile is made from a metal. 
   
   
       5 . A helmet according to  claim 1 , wherein the reinforcing profile exists of composite containing fibers, and a second binder. 
   
   
       6 . A helmet according to  claim 5 , wherein the reinforcing profile contains ceramic fibers, glass fibers, basalt or silicon carbide fibers. 
   
   
       7 . A helmet according to  claim 6 , wherein the reinforcing profile contains carbon fibers 
   
   
       8 . A helmet according to  claim 5 , wherein the reinforcing profile has at least two fiber orientations. 
   
   
       9 . A helmet according to  claim 5 , wherein the U-ring has at least three fiber orientations. 
   
   
       10 . A helmet according to  claim 9 , wherein one fiber orientation is in the profile direction and two other orientations are at +45 degree and −45 degree with the profile direction. 
   
   
       11 . A helmet according to  claim 1 , wherein the sum of the weight of the shell and the reinforcing profile is at most 1.2 kg. 
   
   
       12 . A helmet according to  claim 1 , wherein the reinforcing profile has a compressive yield stress of at least 2 times the compressive yield stress of the shell as measured by ASTM D 6641. 
   
   
       13 . A helmet according to  claim 1 , wherein the part of the reinforcing rim that overlaps with the lateral side of the shell of the helmet has a length of preferably at least 0.5 times the thickness of the shell.