US2025382744A1PendingUtilityA1
Multi-strand cable with two multi-strand layers
Est. expiryJun 20, 2042(~15.9 yrs left)· nominal 20-yr term from priority
D07B 1/0613
59
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Claims
Abstract
The invention relates to a multi-strand cord ( 50 ) having two multi-strand layers, the cord ( 50 ) comprising: a cord internal layer (CI) made up of X=1 multi-strand element (M 1 ) comprising K>1 strands (T 1 ) wound in a helix about a main axis (A), each strand (T 1 ) having at least two layers (C 1 , C 3 ); and a cord external layer (CE) made up of Y>1 multi-strand elements (M 2 ) wound around the internal layer (C 1 ) of the cord, each multi-strand element (M 2 ) comprising L>1 strands (T 2 ) wound in a helix about a main axis (A′), each strand (T 2 ) having at least two layers (C 1 ′; C 3 ′), with the multi-strand elements (M 2 ) being wound in a helix about the main axis (A). The cord ( 50 ) has an endurance criterion V 1 =Δσ bending(M/D)<3000 N×m/g. The cord ( 50 ) has a structural elongation As such that As≥1.0%.
Claims
exact text as granted — not AI-modified1 .- 15 . (canceled)
16 . A multi-strand cord with two multi-strand layers, the cord comprising:
a cord internal layer made up of X=1 multi-strand element comprising K>1 strands wound in a helix about a main axis A, each strand having at least two layers comprising:
an internal layer C 1 made up of Q1 internal metal threads F 1 of diameter d1, and
an external layer C 3 made up of Q3 external metal threads F 3 of diameter d3 wound around the internal layer C 1 , and
a cord external layer made up of Y>1 multi-strand elements wound around the internal layer of the cord, each multi-strand element comprising L>1 strands wound in a helix about an axis A′, each strand having at least two layers comprising:
an internal layer C 1 ′ made up of Q1′ internal metal thread F 1 ′ of diameter d1′, and
an external layer C 3 ′ made up of Q3′ external metal threads F 3 ′ of diameter d3′ wound around the internal layer C 1 ′,
wherein the multi-strand elements are wound in a helix about the main axis A, wherein the cord has an endurance criterion V1=Δσ_bending/(M/D)<3000 N×m/g,
where
Δσ
bending
=
Msteel
×
Max
(
di
;
di
′
)
2
in MPa·mm is a maximum bending stress per unit curvature experienced by the internal and external threads of the internal and external strands, where di and di′ are a diameter of the metal threads and i and i′ range from 1 to 3 and where Msteel=200 000 MPa,
where M is a linear mass of the cord in g/m, M being a sum of cross-sections of metal of all the metal threads in the cord multiplied by a density of steel, Rho, where Rho=7.79 g/cm3, and D is a diameter of the cord in mm, and
wherein the cord has a structural elongation As such that As≥1.0%, the structural elongation As being determined by applying standard ASTM D2969-04 of 2014 to the cord so as to obtain a force-elongation curve, the structural elongation As being equal to the elongation, in %, corresponding to an intersection between a tangent to an elastic portion of the force-elongation curve at some point along the elastic portion thereof and an elongation axis of the force-elongation curve.
17 . The multi-strand cord according to claim 16 , wherein As ≥1.5%.
18 . A multi-strand cord with two multi-strand layers, extracted from a polymer matrix, the extracted cord comprising:
a cord internal layer made up of X=1 multi-strand element comprising K>1 strands wound in a helix about a main axis A, each strand having at least two layers comprising:
an internal layer C 1 made up of Q1 internal metal threads F 1 of diameter d1, and
an external layer C 3 made up of Q3 external metal threads F 3 of diameter d3 wound around the internal layer C 1 , and
a cord external layer made up of Y>1 multi-strand elements wound around the internal layer of the cord, each multi-strand element comprising L>1 strands wound in a helix about an axis A′, each strand having at least two layers comprising:
an internal layer C 1 ′ made up of Q1′ internal metal thread F 1 ′ of diameter d1′, and
an external layer C 3 ′ made up of Q3′ external metal threads F 3 ′ of diameter d3′ wound around the internal layer C 1 ′,
wherein the multi-strand elements are wound in a helix about the main axis A, wherein the extracted cord has an endurance criterion V1=Δσ_bending/(M/D)<3000 N×m/g,
where
Δσ
bending
=
Msteel
×
Max
(
di
;
di
′
)
2
in MPa·mm is a maximum bending stress per unit curvature experienced by the internal and external threads of the internal and external strands, where di and di′ are a diameter of the metal threads and i and i′ range from 1 to 3 and where Msteel=200 000 MPa,
where M is a linear mass of the extracted cord in g/m, M being a sum of cross-sections of metal of all the metal threads in the extracted cord multiplied by a density of steel, Rho, where Rho=7.79 g/cm3, and D is a diameter of the extracted cord in mm, and
wherein the extracted cord has a structural elongation As such that As ≥1.0%, the structural elongation As being determined by applying standard ASTM D2969-04 of 2014 to the extracted cord so as to obtain a force-elongation curve, the structural elongation As being equal to the elongation, in %, corresponding to an intersection between a tangent to an elastic portion of the force-elongation curve at some point along the elastic portion thereof and an elongation axis of the force-elongation curve.
19 . The multi-strand cord according to claim 18 , wherein the criterion V 1 is greater than or equal to 1000 N×m/g.
20 . The multi-strand cord according to claim 18 , wherein the criterion V 1 is less than or equal to 2500 N×m/g.
21 . The multi-strand cord according to claim 18 , wherein M ranges from 30 to 150 g/m.
22 . The multi-strand cord according to claim 18 , wherein the diameter D of the extracted cord ranges from 3 mm to 9 mm.
23 . The multi-strand cord according to claim 18 , wherein the diameters of the metal threads range, independently of one another, from 0.15 mm to 0.50 mm.
24 . The multi-strand cord according to claim 18 , wherein Y is equal to 5, 6, 7, 8, 9 or 10.
25 . The multi-strand cord according to claim 18 , wherein K=2, 3 or 4.
26 . The multi-strand cord according to claim 18 , wherein L=2, 3 or 4.
27 . The multi-strand cord according to claim 18 , wherein each strand of the internal layer has two layers.
28 . The multi-strand cord according to claim 18 , wherein each strand of the external layer has two layers.
29 . A reinforced product comprising a polymer matrix and at least one cord such that properties of the cord, measured after extraction, are properties of the cord according to claim 18 .
30 . A tire comprising at least one cord such that properties of the cord, measured after extraction, are properties of the cord according to claim 18 .
31 . A tire comprising the reinforced product according to claim 29 .Join the waitlist — get patent alerts
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