Method and apparatus for continuous production of a textile structure resistant to perforation and penetration and textile structure thus obtained

Abstract

The present invention refers to a method for continuous production of a textile structure resistant to perforation and penetration, comprising the steps consisting in: a) simultaneously weaving two fabric elements (ES, EI) overlapped and spaced from each other, wherein each of the two fabric elements comprises a bundle of warp threads ( 1 ) which are at least partially made of ballistic threads and which are arranged parallel to each other on a first plane, a bundle of weft threads ( 2 ) which are at least partially made of ballistic threads and which are arranged parallel to each other on a second plane overlapped to the first and oriented at 90° with respect to said warp threads ( 1 ) and a stabilization weave ( 3 ) interwoven between the warp ( 1 ) and weft ( 2 ) threads of said two overlapped planes and made of first binding threads ( 30, 31 ); b) joining, during said step of weaving said two fabric elements (ES, EI) overlapped and spaced from each other, the upper fabric element (ES) and the lower fabric element (EI) to form a multilayer textile structure (SM) with second binding threads ( 4 ) alternatingly interwoven therein.

1 ) Method for continuous production of a textile structure resistant to perforation and penetration, comprising the steps consisting in:
 a) simultaneously weaving two fabric elements (ES, EI) overlapped and spaced from each other, wherein each of the two fabric elements comprises a bundle of warp threads ( 1 ) which are at least partially made of ballistic threads and which are arranged parallel to each other on a first plane, a bundle of weft threads ( 2 ) which are at least partially made of ballistic threads and which are arranged parallel to each other on a second plane overlapped to the first and oriented at 90° with respect to said warp threads ( 1 ) and a stabilization weave ( 3 ) interwoven between the warp ( 1 ) and weft ( 2 ) threads of said two overlapped planes and made of first binding threads ( 30 ,  31 );   b) joining, during said step of weaving said two fabric elements (ES, EI) overlapped and spaced from each other, the upper fabric element (ES) and the lower fabric element (EI) to form a multilayer textile structure (SM) with second binding threads ( 4 ) alternatingly interwoven therein;   c) inserting, during said weaving step, at least one intermediate layer (SI) in the form of strips or threads parallel to the warp direction between said two upper (ES) and lower (EI) fabric elements;   d) joining the assembly of the two upper (ES) and lower (EI) fabric elements joined together by said second binding threads ( 4 ) and between which said intermediate layer (SI) is arranged to obtain a multilayer textile structure (SM′).   
     
     
         2 ) Method according to  claim 1 , characterized in that said joining comprises providing a warp or chain of said second binding threads ( 4 ) and then weaving the latter alternatingly in said upper fabric element (ES) and in said lower fabric element (EI). 
     
     
         3 ) Method according to  claim 2 , wherein said joining step occurs by hot or cold pressing said assembly of the two upper (ES) and lower (EI) fabric elements joined together by said second binding threads ( 4 ) and between which said intermediate layer (SI) is interposed. 
     
     
         4 ) Method according to  claim 3 , comprising a step of applying to said multilayer textile structure (SM, SM′) at least one impregnating substance or at least one surface coating. 
     
     
         5 ) Method according to  claim 1 , wherein said ballistic threads ( 1 ,  2 ) have the following characteristics:
 tensile strength >7 gr/dtex   elastic modulus >200 gr/dtex   impact strength >10 J/gr   density >0.8 gr/cmc   count comprised between 100 dtex and 10000 dtex.   
     
     
         6 ) Method according to  claim 1 , wherein said intermediate layer (SI) is made of thermoplastic polymeric material, thermosetting polymeric material, elastomeric material, viscous material, adhesive polymers and their blends. 
     
     
         7 ) Apparatus ( 10 ) for implementing the method according to one of  claims 1  to  6 , characterized in that it comprises:
 a weaving loom ( 11 ) with two overlapped fabric pieces of the warp pile fabric velvet loom type which comprises:   a support framework ( 12 ),   at least one feeding group ( 13 ) from which the warp of the ballistic threads ( 1 ) respectively of the upper fabric element (ES) and of the lower fabric element (EI) is unwound,   at least one first feeding group ( 14 ) of the warp of the first binding threads ( 31 ) of the stabilization weave ( 3 ) respectively of the upper fabric element (ES) and of the lower fabric element (EI);   at least one second feeding group ( 15 ) of the warp or chain of the second binding threads ( 4 ) of said upper fabric element (ES) with said lower fabric element (EI);   at least one first order of heddles ( 16 ) for the warp, ballistic ( 1 ) and binding ( 31 ) threads, of the upper fabric element (ES) and a second order of heddles ( 17 ) for the warp, ballistic ( 1 ) and binding ( 31 ) threads, of the lower fabric element ( 31 ),   at least one third order of heddles ( 18 ) for the warp of the second binding threads ( 4 ) of said upper fabric element (ES) with said lower fabric element (EI);   a sley ( 19 ) bearing a reed ( 20 ) passing between whose teeth are the warp, ballistic ( 1 ) and binding ( 31 ) threads, of the upper fabric element (ES) and of the lower fabric element (EI) and the warp of the second binding threads ( 4 );   at least two members ( 21 ,  22 ) for simultaneous insertion of the weft threads, alternatingly ballistic ( 2 ) and binding ( 30 ) threads, respectively into the upper and lower warp mouths defined by said orders of heddles for respectively forming said upper fabric element (ES) and said lower fabric element (EI) joined together by said second binding threads ( 4 );   a group ( 23 ) for drawing said upper (ES) and lower (EI) fabric elements joined together by said second binding threads ( 4 ) in a multilayer textile structure (SM), such drawing group being arranged downstream of said loom ( 11 );   a group ( 24 ) for collecting said multilayer textile structure (SM) arranged downstream of said drawing group ( 23 ), wherein said apparatus also comprises a further feeding group ( 25 ) of said at least one intermediate layer (SI) in the form of threads or strips arranged near to said feeding groups.   
     
     
         8 ) Apparatus ( 10 ) according to  claim 7 , characterized in that said further feeding group ( 25 ) of said at least one intermediate layer (SI) comprises a beam from which said intermediate layer (SI) is unwound in the form of threads or strips. 
     
     
         9 ) Apparatus ( 10 ) according to  claim 7 , characterized in that said further feeding group ( 25 ) of said at least one intermediate layer (SI) comprises a roll from which said intermediate layer (SI) is unwound in the form of continuous film, downstream of said roll being provided a group for cutting said continuous film into a plurality of strips or threads parallel to the warp direction. 
     
     
         10 ) Apparatus ( 10 ) according to  claim 7 , characterized in that said drawing group ( 23 ) comprises at least one pair of pressure rollers parallel and counter-rotating with respect to each other. 
     
     
         11 ) Apparatus ( 10 ) according to one of  claims 7  to  10 , characterized in that it comprises a group ( 29 ) for applying at least one impregnating substance or at least one surface coating to said multilayer textile structure (SM) that is interposed between said drawing group ( 23 ) and said collecting group ( 24 ). 
     
     
         12 ) Multilayer textile structure (SM, SM′) obtainable through the method according to one of  claims 1  to  6 , characterized in that it comprises two fabric elements (ES, EI) overlapped and spaced from each other, wherein each of said two fabric elements comprises a bundle of warp threads ( 1 ) which are at least partially made of ballistic threads and which are arranged parallel to each other on a first plane, a bundle of weft threads ( 2 ) which are at least partially made of ballistic threads and which are arranged parallel to each other on a second plane overlapped to the first and oriented at 90° with respect to said warp threads ( 1 ) and a stabilization weave ( 3 ) interwoven between the warp ( 1 ) and weft ( 2 ) threads of said two overlapped planes and made of first binding threads and second binding threads ( 4 ) interwoven between said two fabric elements (ES, EI) overlapped with respect to each other, said structure also comprising at least one said intermediate layer (SI) interposed between said two upper (ES) and lower (EI) fabric elements. 
     
     
         13 ) Structure (SM, SM′) according to  claim 12 , characterized in that said second binding threads ( 4 ) comprise warp threads or chain alternatingly woven in said upper fabric element (ES) and in said lower fabric element (EI).