Yarn, apparatus and methods preparing thereof

Abstract

The present disclosure provides composite yarn, apparatus and methods preparing thereof. The composite yarn of the present disclosure includes wrapping fibers and a central yarn that is formed by a first body yarn and a second body yarn, wherein a portion of the wrapping fibers are combined with the central yarn in at least one of the following states: a first state, a portion of the wrapping fibers wrap around the first body yarn or the second body yarn; a second state, a portion of the wrapping fibers wrap around the first body yarn and the second body yarn respectively at the same time; a third state, a portion of the wrapping fibers wrap around the central yarn. The composite yarn of the present disclosure has low twist factor and high strength, which solves the problem of severe strength loss associated with low twist factors existing in conventional low-twist techniques.

What is claimed is: 
     
         1 . A composite yarn ( 2 ), comprising a central yarn ( 18 ) and wrapping fibers ( 19 ), wherein the central yarn ( 18 ) comprises a first body yarn ( 16   a ) and a second body yarn ( 16   b ); and
 wherein the wrapping fibers ( 19 ) are combined with the central yarn ( 18 ) in at least one of the following states:   a first state: a portion of the wrapping fibers ( 19 ) wrap around the first body yarn ( 16   a ) or the second body yarn ( 16   b );   a second state: a portion of the wrapping fibers ( 19 ) wrap around the first body yarn ( 16   a ) and the second body yarn ( 16   b ) respectively; and   a third state: a portion of the wrapping fibers ( 19 ) wrap around the central yarn ( 18 ).   
     
     
         2 . The composite yarn ( 2 ) of  claim 1 , wherein the portion of the wrapping fibers ( 19 ) are combined with the central yarn ( 18 ) in both the first state and the third state, wherein the portion of the wrapping fibers ( 19 ) in the first state have a wrapping direction opposite to the wrapping direction of the portion of the wrapping fibers ( 19 ) in the third state. 
     
     
         3 . The composite yarn ( 2 ) of  claim 1 , wherein
 a first portion of the wrapping fibers ( 19 ) are combined with the central yarn ( 18 ) in the first state;   a second portion of the wrapping fibers ( 19 ) are combined with the central yarn ( 18 ) in the second state; and   a third portion of the wrapping fibers ( 19 ) are combined with the central yarn ( 18 ) in both the first state and the third state, wherein the third portion of the wrapping fibers ( 19 ) in the first state have a wrapping direction opposite to the wrapping direction of the third portion of the wrapping fibers ( 19 ) in the third state.   
     
     
         4 . The composite yarn ( 2 ) of  claim 1 , wherein the first body yarn ( 16   a ) and the second body yarn ( 16   b ) are arranged in parallel to form the central yarn ( 18 ). 
     
     
         5 . The composite yarn ( 2 ) of  claim 1 , wherein the first body yarn ( 16   a ) and the second body yarn ( 16   b ) twist with each other to form the central yarn ( 18 ). 
     
     
         6 . The composite yarn ( 2 ) of  claim 1 , wherein the first body yarn ( 16   a ) has a yarn count of 5-200 denier, and the second body yarn ( 16   b ) has a yarn count of 5-200 denier. 
     
     
         7 . The composite yarn ( 2 ) of  claim 1 , wherein the weight percentage of the first body yarn ( 16   a ) and the second body yarn ( 16   b ) to the total weight of the composite yarn ( 2 ) is 60% to 65%. 
     
     
         8 . The composite yarn ( 2 ) of  claim 1 , wherein the twist factor of the central yarn ( 18 ) is 0 to 1.5. 
     
     
         9 . An apparatus for preparing the composite yarn of  claim 1 , comprising:
 at least one back roller ( 11   a ) for infeeding at least one roving ( 12 ) comprising at least one short fiber ( 12   a );   at least one front roller ( 11   b ) for infeeding a first filament ( 13   a ), a second filament ( 13   b ) and the at least one roving ( 12 ) outfeeding from the at least one back roller, the at least one roving ( 12 ) being positioned between the first filament ( 13   a ) and the second filament ( 13   b ) at the at least one front roller ( 11   b ); and   a false twisting device ( 14 ) in front of the at least one front roller ( 11   b ) for infeeding the first filament ( 13   a ) and the second filament ( 13   b ) and the at least one roving ( 12 ) outfeeding from the at least one front roller ( 11   b ), so that the at least one roving ( 12 ) is combined with the first filament ( 13   a ) and/or the second filament ( 13   b ) to form the composite yarn ( 2 ), wherein the first filament ( 13   a ) and the second filament ( 13   b ) together form the central yarn ( 18 ) of the composite yarn ( 2 ), and the at least one roving ( 12 ) forms the wrapping fibers ( 19 ) of the composite yarn ( 2 ).   
     
     
         10 . The apparatus of  claim 9 , wherein the front roller ( 11   b ) and the false twisting device ( 14 ) are configured to form a twisting triangle region between the front roller ( 11   b ) and the false twisting device ( 14 ) so that a first portion of the at least one short fiber ( 12   a ) of the at least one roving ( 12 ) wraps around the first filament ( 13   a ) or the second filament ( 13   b ) within the twisting triangle region, and a second portion of the at least one short fiber ( 12   a ) of the roving ( 12 ) remains free. 
     
     
         11 . The apparatus of  claim 9 , further comprising a winding device ( 20 ) in front of the false twisting device ( 14 ) for directly winding the composite yarn ( 2 ). 
     
     
         12 . The apparatus of  claim 11 , wherein the winding device ( 20 ) comprises a twisting element for twisting the composite yarn ( 2 ) during the winding. 
     
     
         13 . A method for preparing the composite yarn ( 2 ) using the apparatus of  claim 11 , comprising:
 infeeding a first filament ( 13   a ) and a second filament ( 13   b ) into the front roller ( 11   b ), wherein the first filament ( 13   a ) and the second filament ( 13   b ) are separate by a distance at the front roller ( 11   b ) so that the first filament ( 13   a ) and the second filament ( 13   b ) form a twisting triangle region before entering the false twisting device ( 14 );   infeeding at least one roving ( 12 ) comprising at least one short fiber ( 12   a ) into the back roller ( 11   a ), and outfeeding the at least one roving ( 12 ) from the front roller ( 11   b ), wherein the at least one roving ( 12 ) is positioned between the first filament ( 13   a ) and the second filament ( 13   b ) at the front roller ( 11   b );   infeeding the first filament ( 13   a ) and the second filament ( 13   b ) and the at least one roving ( 12 ) into the false twisting device ( 14 ) to form the composite yarn ( 2 ), wherein the first filament ( 13   a ) forms the first body yarn ( 16   a ), the second filament ( 13   b ) forms the second body yarn ( 16   b ), and the at least one roving ( 12 ) forms the wrapping fibers ( 19 ), the first body yarn ( 16   a ) and the second body yarn ( 16   b ) being arranged to form the central yarn ( 18 ), and the wrapping fibers ( 19 ) being combined with the central yarn ( 18 ) in at least one of the following ways:   a first way: a portion of the wrapping fibers ( 19 ) wrap around the first body yarn ( 16   a ) or the second body yarn ( 16   b );   a second way: a portion of the wrapping fibers ( 19 ) wrap around the first body yarn ( 16   a ) and the second body yarn ( 16   b ) respectively; and   a third way: a portion of the wrapping fibers ( 19 ) wrap around the central yarn ( 18 ).   
     
     
         14 . The method of  claim 13 , wherein the distance is 1.0 mm to 20 mm. 
     
     
         15 . The method of  claim 13 , wherein the yarn count (Ne) of the central yarn ( 18 ) is 2.5 to 120. 
     
     
         16 . The method of  claim 13 , wherein the portion of the wrapping fibers ( 19 ) are combined with the central yarn ( 18 ) in both the first way and the third way, wherein the portion of the wrapping fibers ( 19 ) in the first way have a wrapping direction opposite to the wrapping direction of the portion of the wrapping fibers ( 19 ) in the third way. 
     
     
         17 . The method of  claim 13 , wherein in the second way, the wrapping directions of the portion of the wrapping fibers ( 19 ) around the first body yarn ( 16   a ) and the second body yarn ( 16   b ) are the same. 
     
     
         18 . The method of  claim 13 , further comprising twisting the first filament ( 13   a ) and the second filament ( 13   b ) while infeeding the first filament ( 13   a ) and the second filament ( 13   b ) into the false twisting device ( 14 ). 
     
     
         19 . The method of  claim 13 , further comprising directly winding the composite yarn ( 2 ). 
     
     
         20 . The method of  claim 13 , further comprising twisting while winding the composite yarn ( 2 ).