Tear/puncture resistant semi-laminate material

Abstract

A tear/puncture resistant semi-laminate material having a first layer of a flexible sheet of thermoplastic material and a second layer of a water impermeable thermoplastic material impregnated with a volatile corrosion inhibitor. The layers are not bonded with a uniform layer of adhesive, but are semi-laminated by bonding at points or in strips at the edges of the respective layers or at discrete, discontinuous intervals across the width of the material. In the preferred embodiments, the first layer is a tear resistant layer, which may be a layer of woven fibers, a nonwoven layer of spunbonded fibers, or a tear resistant film. In an alternative embodiment, polypropylene is substituted for polyethylene in the first and second layers.

1. A tear/puncture resistant semi-laminate material, comprising:
 (i) a first layer, being a flexible sheet of thermoplastic material; and  
 (ii) a second layer, being a flexible sheet of a water impermeable, puncture resistant thermoplastic material impregnated with a volatile corrosion inhibitor;  
 wherein the  said layers are bonded together by bonding in narrow strips at the  edges of the respective layers and at discrete, discontinuous intervals across the width of said layers .  
 
     
     
       2. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of a tear resistant sheet of polyethylene; and  
 (ii) said second layer consists essentially of a water impermeable sheet of polyethylene impregnated with a volatile corrosion inhibitor.  
 
     
     
       3. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of woven, high density polyethylene fibers; and  
 (ii) said second layer consists essentially of low density polyethylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       4. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of nonwoven, spunbonded polyethylene fibers; and  
 (ii) said second layer consists essentially of polyethylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       5. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of a tear resistant sheet of polyethylene film; and  
 (ii) said second layer consists essentially of polyethylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       6. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of polyethylene film; and  
 (ii) said second layer consists essentially of polyethylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       7. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of a tear resistant sheet of polypropylene; and  
 (ii) said second layer consists essentially of a water impermeable sheet of polypropylene impregnated with a volatile corrosion inhibitor.  
 
     
     
       8. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of woven, polypropylene fibers; and  
 (ii) said second layer consists essentially of low density polypropylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       9. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of nonwoven, spunbonded polypropylene fibers; and  
 (ii) said second layer consists essentially of polypropylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       10. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of a tear resistant sheet of polypropylene film; and  
 (ii) said second layer consists essentially of polypropylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       11. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein:
 (i) said first layer consists essentially of polypropylene film; and  
 (ii) said second layer consists essentially of polypropylene film impregnated with a volatile corrosion inhibitor.  
 
     
     
       12. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein the volatile corrosion inhibitor impregnated in said second layer comprises sodium nitrite. 
     
     
       13. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein said first layer has a smaller surface area than said second layer, said first layer being bonded to said second layer about the periphery of said first layer. 
     
     
       14. The tear/puncture resistant semi-laminate material according to  claim 1 , wherein said second layer has a smaller surface area than said first layer, said second layer being bonded to said first layer about the periphery of said second layer. 
     
     
       15. The tear/puncture resistant semi- laminate material according to    claim 1   , wherein said layers are further bonded together in narrow strips at discrete discontinuous intervals across the width of said layers.