Airbag and method of producing an airbag

Abstract

The invention relates to a two-ply airbag consisting of a textile surface structure, said plies lying opposite one another and enclosing at least one chamber that can be filled with gas. The piles have surfaces that face outwards. The airbag is characterized in that coatings, which are suitable for sealing and reinforcing the airbag, are applied to said surfaces.

1 . An air bag comprising two non-gastight plies of a textile sheet fabric, the plies facing each other and enclosing at least one chamber that can be filled with gas, the plies having surfaces facing outwards, comprising a fabric dictating the outer and inner structure of the air bag and on each surface facing outwards one coating is disposed for strengthening and rendering the air bag resistant to leakage.  
   
   
       2 . The air bag as set forth in  claim 1 , wherein said coatings comprise films keyed to the surfaces chemically, thermally or mechanically.  
   
   
       3 . The air bag as set forth in  claim 1 , wherein the coatings comprise plastics-sheathed threads of the fabric plies.  
   
   
       4 . The air bag as set forth in  claim 1 , wherein said textile sheet fabric is a woven.  
   
   
       5 . The air bag as set forth in  claim 1 , wherein said textile sheet fabric is a knit or a non-woven fleece.  
   
   
       6 . The air bag as set forth in  claim 4 , wherein said textile sheet fabric comprises bicomponent yarns.  
   
   
       7 . The air bag as set forth in  claim 1 , wherein said textile sheet fabric is a thinned fabric, whose surface is laminated with a coating or film.  
   
   
       8 . A method of producing an air bag comprising two woven plies facing each other and enclosing at least one chamber that can be filled with gas, the plies having surfaces facing outwards, on which coatings, laminates, films or covering layers are deposited suitable for strengthening and/or rendering the air bag resistant to leakage, comprising the steps: 
 weaving the air bag on a weaving machine controlled particularly by a Jacquard device,    hot rolling thermoplastics films on the surfaces, the keying points in the fabric being flattened by pressure in thus forming a larger contact surface for the films.    
   
   
       9 . The method as set forth in  claim 8 , wherein said surfaces and/or coatings, laminates, films or covering layers are prepared at least in part by a corona treatment or by a plasma treatment or by fluorination before roll application of the films.  
   
   
       10 . The method as set forth in  claim 8 , wherein films of polyamide, polyester, silicone, neoprene or polyurethane are laminated to said surfaces.  
   
   
       11 . The method as set forth in  claim 8 , wherein said surfaces are provided with a film of silicone which is in turn treated with fluorine gas.