Method for manufacturing double-layer multi-strand metal cord
A technology for metal cords and cords, applied in the field of manufacturing multi-strand cords, can solve problems such as insufficient specific applications, and achieve the effect of improving resistance and high resistance
Inactive Publication Date: 2017-02-22
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0006] This prior art cord has acceptable resistance to corrosion and elasticity, but has a relatively limited breaking force which, while satisfactory for some applications, is insufficient for certain applications, especially In the case of cords used for tires of heavy industrial vehicles
Method used
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Embodiment Construction
[0085] Cord obtained by the method according to the invention
[0086] figure 1 An example of a metal cord denoted by reference numeral 10 is shown. The cord 10 is of the multi-strand type with two cylindrical layers. It will thus be understood that there are two layers of strands from which the cord 10 is made. The strand layers are adjacent and concentric. When the cord 10 is not integrated in a tire, the cord 10 has no rubber.
[0087] The cord 10 comprises an inner layer C1 of the cord 10 consisting of K inner strands TI, wherein preferably K=3 or K=4, and in this example K=3. The inner layer C1 has a substantially tubular wrapping which gives the inner layer C1 its cylindrical profile E1 .
[0088] The inner strand TI is helically wound with a lay pitch pi of between 3.6 and 16 mm inclusive, preferably between 4 and 12.8 mm inclusive. In this example, pi = 7.5 mm.
[0089] The cord also comprises an outer layer C2 of the cord 10 consisting of L outer strands TE, wh...
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Abstract
Method for manufacturing a double-layer multi-strand metal cord (10), said method comprising: - helically winding the constituent strands (TI, TE) around the 2 wires of the inner layer constituting the strands (TI, TE) in such a way , TE) to form strands (TI, TE); ‑ helically wound around K>1 pre-formed inner strands (TI) forming the inner layer (C1) of the cord (10) L > 1 pre-formed outer strand (TE) constituting the unsaturated outer layer (C2) of the cord (10), - over-twisted wound cords (TI, TE); - over-twisted in such a way a balancing step of closing the cords (10) so as to obtain zero residual torque in the cords (10), and an untwisting step of balancing the overtwisted cords (10).
Description
technical field [0001] The present invention relates to a method for the manufacture of multi-strand cords which can be used in particular to reinforce tires, in particular tires for heavy industrial vehicles. Background technique [0002] A tire with radial carcass reinforcement comprises a tread, two inextensible beads, two sidewalls connecting the beads to the tread, and a tire circumferentially disposed between the carcass reinforcement and the tread. Belt or crown reinforcement. The belt comprises a plurality of rubber plies optionally reinforced with reinforcing elements or reinforcements, for example cords or monofilaments of metal or textile type. [0003] The tire belt usually consists of at least two superimposed belt plies (sometimes referred to as "working" plies or "crossing" plies) whose usually metallic reinforcing cords are actually The plies are arranged parallel to each other within the ply, but cross from one ply to the other, that is, symmetrically or a...
Claims
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IPC IPC(8): D07B1/06D07B5/12D07B7/02
CPCD07B1/0613D07B5/12D07B7/022D07B1/0646D07B2201/206D07B2201/2061D07B2201/2025D07B2201/2029D07B2201/2032D07B2201/2023D07B2201/1076D07B2201/1084D07B2201/1068D07B2205/306D07B2205/3071D07B2205/3085D07B2205/3089D07B2205/3035D07B2205/3046D07B2205/3021D07B2205/3028D07B2501/2046D07B2401/208D07B2401/2085D07B2401/2005D07B2401/201D07B2401/2015D07B2801/12D07B2801/24D07B2801/10D07B2801/18D07B2207/4072D07B2201/104D07B2201/2059Y10S174/12
Inventor H·巴尔盖E·克莱芒T·拉彭尼T·鲍狄埃
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN