ARAMID TEXTILE CORD WITH AN AT LEAST TRIPLE TWIST
An aramid textile cord ( 50 ) with at least triple twist (T 1 , T 2 , T 3 ) comprises at least N strands ( 20 a, 20 b, 20 c, 20 d ), N being greater than 1, twisted together with a final twist T 3 and a final direction D 2 , each strand being made up of M pre-strands ( 10 a, 10 b, 10 c ), M being greater than 1, themselves twisted together with an intermediate twist T 2 (T 2 a , T 2 b , T 2 c , T 2 d ) and an intermediate direction D 1 opposite to D 2 , each pre-strand itself consisting of a yarn ( 5 ) which has been twisted on itself beforehand with an initial twist T 1 (T 1 a , T 1 b , T 1 c ) and the direction D 1 , in which at least half of the N times M yarns are aramid yarns. This textile cord can advantageously be used as a reinforcer in tires for vehicles, particularly in the belt or carcass reinforcement of these tires.
1 .- 21 . (canceled)
22 . An aramid textile cord with at least triple twist comprising:
at least N strands, N being greater than 1, twisted together with a twist T 3 and a direction D 2 ,
wherein each strand is made up of M pre-strands, M being greater than 1, themselves twisted together with a twist T 2 and a direction D 1 opposite to D 2 ,
wherein each pre-strand consists of a yarn which has been twisted on itself with a twist T 1 and the direction D 1 , and
wherein at least half of the N times M yarns are aramid yarns.
23 . The aramid textile cord according to claim 22 , wherein N varies in a range from 2 to 6.
24 . The aramid textile cord according to claim 23 , wherein N varies in a range from 2 to 4.
25 . The aramid textile cord according to claim 22 , wherein M varies in a range from 2 to 6.
26 . The aramid textile cord according to claim 25 , wherein M varies in a range from 2 to 4.
27 . The aramid textile cord according to claim 22 , wherein the total number N times M of yarns is comprised in a range from 4 to 25.
28 . The aramid textile cord according to claim 27 , wherein the total number N times M of yarns is comprised in a range from 4 to 16.
29 . The aramid textile cord according to claim 22 , wherein the twist T 1 , expressed in turns per meter, comprises between 10 and 350 turns per meter.
30 . The aramid textile cord according to claim 29 , wherein the twist T 1 comprises between 20 and 200 turns per meter.
31 . The aramid textile cord according to claim 22 , wherein each pre-strand has a twist coefficient K 1 which comprises between 2 and 80.
32 . The aramid textile cord according to claim 31 , wherein each pre-strand has a twist coefficient K 1 which comprises between 6 and 70.
33 . The aramid textile cord according to claim 22 , wherein the twist T 2 , expressed in turns per meter, comprises between 25 and 470 turns per meter.
34 . The aramid textile cord according to claim 33 , wherein the twist T 2 comprises between 35 and 400 turns per meter.
35 . The aramid textile cord according to claim 22 , wherein each strand has a twist coefficient K 2 which comprises between 10 and 150.
36 . The aramid textile cord according to claim 35 , wherein each strand has a twist coefficient K 2 which comprises between 20 and 130.
37 . The aramid textile cord according to claim 22 , wherein the twist T 3 , expressed in turns per meter, comprises between 30 and 600 turns per meter.
38 . The aramid textile cord according to claim 37 , wherein the twist T 3 comprises between 80 and 500 turns per meter.
39 . The aramid textile cord according to claim 22 , wherein the cord has a twist coefficient K 3 which comprises between 50 and 500.
40 . The aramid textile cord according to claim 39 , wherein the cord has a twist coefficient K 3 which comprises between 80 and 230.
41 . The aramid textile cord according to claim 22 , wherein T 2 is greater than T 1 .
42 . The aramid textile cord according to claim 22 , wherein T 3 is greater than T 2 .
43 . The aramid textile cord according to claim 22 , wherein T 2 comprises between 0.2 and 0.95 times T 3 .
44 . The aramid textile cord according to claim 43 , wherein T 2 comprises between 0.4 and 0.8 times T 3 .
45 . The aramid textile cord according to claim 22 , wherein the sum T 1 +T 2 comprises between 0.8 and 1.2 times T 3 .
46 . The aramid textile cord according to claim 45 , wherein the sum of T 1 +T 2 comprises between 0.9 and 1.1 times T 3 .
47 . The aramid textile cord according to claim 45 , wherein the sum T 1 +T 2 is equal to T 3 .
48 . The aramid textile cord according to claim 22 , wherein the majority of the N times M yarns are aramid yarns.
49 . The aramid textile cord according to claim 48 , wherein all of the N times M yarns are aramid yarns.
50 . A method of reinforcing an item or semi-finished product made of plastic or of rubber comprising the step of including an aramid textile cord according to claim 22 in the item or semi-finished product.
51 . An item or semi-finished product made of plastic or of rubber reinforced with an aramid textile cord according to claim 22 .
52 . A method of reinforcing a tire comprising the step of including an aramid textile cord according to claim 22 in a tire.
53 . A tire reinforced with an aramid textile cord according to claim 22 .