Highly permeable rubber 1+6 type steel cord

Abstract

The application discloses a high-penetration rubber 1+6 type steel cord and belongs to the technical field of tire framework materials, which comprises one core wire and six surface wires, the six surface wires are twisted around the core wire to form a steel cord in the same twist direction, the transverse section of the steel cord is circular, the wavelength of the core wire is greater than that of the surface wire, and the wave height of the surface wire is greater than that of the core wire. The application can significantly improve the cord penetration performance and structural stability, prolong the service life and improve the safety.

Description

Technical Field

[0001] This invention relates to a high-permeability rubber 1+6 type steel cord, belonging to the technical field of tire skeleton materials, and particularly to high-permeability rubber skeleton materials. Background Technology

[0002] As a core component of a vehicle, radial tires directly determine the overall performance and safety of the vehicle through their durability, ride comfort, and structural strength. Steel cords, as the reinforcing material of the tire's skeleton, play a crucial role in bearing stress, maintaining tire shape, and enhancing structural toughness, thus providing vital support for the overall tire performance.

[0003] like Figure 2 As shown, the 1+6 structure is a long-standing and conventional structural form for steel cord, widely used in tire manufacturing. However, this structure has significant performance defects in practical use, with insufficient rubber penetration being the most critical and impactful issue. Commonly used 1+6 steel cord specifications in industry include 0.32+6×0.30, 0.37+6×0.32, and 0.37+6×0.35. In this structure, the diameter difference between the core filament and the outer single filament is small, and the six outer steel wires are tightly arranged with almost no gaps between them. During the tire vulcanization process, the lack of effective penetration channels for molten rubber easily leads to the formation of unfilled voids between the inner filaments. When microcracks develop in the tire during use, moisture, under surface tension, continuously penetrates deeper into the internal voids, creating a humid and hot corrosive environment within the steel wire gaps. This causes rapid corrosion of the steel cord and accelerates the aging and failure of surrounding rubber materials, significantly shortening the tire's lifespan and safety cycle. Furthermore, because the core wire is not fully wrapped and bound by the rubber, the tire repeatedly rolls and deforms during driving, which will continuously exert a directional force on the core wire. Under long-term action, the core wire may puncture the rubber tire body, further threatening the safety of tire use. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a high-adhesion 1+6 type steel cord, which can significantly improve the adhesive penetration performance and structural stability of the cord, and improve its service life and safety.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A high-permeability adhesive 1+6 type steel cord includes a core filament and six face filaments. The six face filaments are twisted around the core filament in the same direction to form a steel cord. The steel cord has a circular cross-section. The wavelength of the core filament is greater than the wavelength of the face filaments, and the wave height of the face filaments is greater than the wave height of the core filaments.

[0007] The twist direction is set to S twist.

[0008] The twist direction is set to Z twist.

[0009] The diameter of the core wire is d1, which satisfies 0.15mm≤d1≤0.40mm.

[0010] The diameter of the noodle wire is d2, which satisfies 0≤d1-d2≤0.1 and d1 / d2≤1.2.

[0011] The twist distance of the face yarn is 16±10mm.

[0012] The core wire wavelength is S1, and the surface wire wavelength is S2, satisfying 2mm≤S1≤4mm and 0.2mm≤S1-S2≤2mm.

[0013] The core wire has a wave height of H1 and the face wire has a wave height of H2, satisfying 0.10mm≤H1≤0.20mm, 0.05mm≤H2≤0.15mm and 1.2≤H1 / H2≤2.

[0014] The beneficial effects of this invention are as follows: In this invention, the core filament and the face filament have different wavelengths and wave heights. The core filament wavelength is greater than that of the face filament, and the face filament wave height is greater than that of the core filament. Through this waveform design, the steel cord possesses excellent openness, increasing the gap between the core filament and the face filament. This provides a smooth flow channel for the rubber during vulcanization, significantly reducing the rubber penetration resistance and allowing the rubber to fully penetrate into the gaps between the filaments within the cord. This effectively improves the overall rubber penetration rate of the cord and enhances the bonding strength between the steel wire and the rubber. Simultaneously, the high wave structure of the core filament forms a tight interlocking state with the six face filaments. The radial fixing and circumferential constraint effect of the face filaments on the core filament is significantly enhanced, restricting the movement and displacement of the core filament during use. Structurally, this effectively prevents the core filament from piercing the rubber layer, effectively improving the structural reliability and service life of rubber products such as tires. It has good technical value and application prospects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of a high-permeability adhesive 1+6 type steel cord according to the present invention;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of a conventional 1+6 steel cord. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0018] Example 1

[0019] like Figure 1As shown, the present invention discloses a high-permeability adhesive 1+6 type steel cord, comprising one core wire and six face wires. The six face wires are twisted around the core wire in the same twist direction to form a steel cord. The steel cord has a circular cross-section, and the wavelength of the core wire is greater than that of the face wires, while the wave height of the face wires is greater than that of the core wires.

[0020] In this invention, the core filament and the face filament have different wavelengths and wave heights. The core filament wavelength is greater than the face filament wavelength, and the face filament wave height is greater than the core filament wavelength. Through this waveform design, the steel cord possesses excellent openness, increasing the gap between the core filament and the face filament. This provides a smooth flow channel for the rubber during vulcanization, significantly reducing the rubber penetration resistance and allowing the rubber to fully penetrate into the gaps between the filaments within the cord. This effectively improves the overall rubber penetration rate of the cord and enhances the bonding strength between the steel wire and the rubber.

[0021] Example 2

[0022] like Figure 1 As shown, the present invention discloses a high-permeability adhesive 1+6 type steel cord, comprising one core wire and six face wires. The six face wires are twisted around the core wire in the same twist direction to form a steel cord. The cross-section of the steel cord is circular. The wavelength of the core wire is greater than the wavelength of the face wires, and the wave height of the face wires is greater than the wave height of the core wires.

[0023] The twist direction is set to S twist or Z twist; in this embodiment, S twist is selected.

[0024] The core wire diameter is d1, satisfying 0.15mm ≤ d1 ≤ 0.40mm. The face wire diameter is d2, satisfying 0 ≤ d1 - d2 ≤ 0.1, and d1 / d2 ≤ 1.2. In this embodiment, d1 is 0.37mm and d2 is 0.32mm.

[0025] The twist distance of the face yarn is 16±10mm, and 16mm is selected in this embodiment.

[0026] The core wire wavelength is S1, and the surface wire wavelength is S2, satisfying 2mm≤S1≤4mm and 0.2mm≤S1-S2≤2mm. In this embodiment, S1 is 3.1mm and S2 is 2.7mm.

[0027] The core wire wave height is H1, and the face wire wave height is H2, satisfying 0.10mm≤H1≤0.20mm, 0.05mm≤H2≤0.15mm, and 1.2≤H1 / H2≤2. In this embodiment, H1 is 0.145mm and H2 is 0.095mm.

[0028] Comparative Example

[0029] This comparative example discloses a 1+6 type steel cord, which adopts a conventional industrial structure, including one core wire and six face wires. The six face wires are twisted around the core wire in the same direction to form a steel cord. The steel cord has a circular cross-section, with a core wire diameter of 0.37 mm and a face wire diameter of 0.32 mm. The twist direction is S-twist, and the twist pitch is 16 mm.

[0030] Table 1. Performance comparison of conventional 0.37+6×0.32ST and the high-penetration adhesive 0.37+6×0.32ST of Example 2 of the present invention.

[0031]

[0032] As can be seen from Table 1, the adhesive penetration rate of the high-penetration 1+6 type steel cord of this invention is 80%, which is significantly improved compared to the 0% of the conventional 1+6 type steel cord in the comparative example. The adhesive application rate of the core filament also increased from the conventional 0% to 43%. In addition, the adhesive strength increased from the conventional 811N to 924N, an increase of about 14%, and the core filament pull-out force increased from the conventional 23N to 87N, which is about 3.78 times that of the previous one.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-permeability adhesive 1+6 type steel cord, characterized in that: It includes one core filament and six face filaments. The six face filaments are twisted around the core filament in the same direction to form a steel cord. The steel cord has a circular cross-section. The wavelength of the core filament is greater than the wavelength of the face filaments, and the wave height of the face filaments is greater than the wave height of the core filaments.

2. The high-permeability adhesive 1+6 type steel cord according to claim 1, characterized in that: The twist direction is set to S twist.

3. The high-permeability adhesive 1+6 type steel cord according to claim 1, characterized in that: The twist direction is set to Z twist.

4. The high-permeability adhesive 1+6 type steel cord according to claim 1, characterized in that: The diameter of the core wire is d1, which satisfies 0.15mm≤d1≤0.40mm.

5. The high-permeability adhesive 1+6 type steel cord according to claim 3, characterized in that: The diameter of the noodle thread is d2, which satisfies 0≤d1-d2≤0.1 and d1 / d2≤1.

2.

6. The high-permeability adhesive 1+6 type steel cord according to claim 1, characterized in that: The twist distance of the face yarn is 16±10mm.

7. The high-permeability adhesive 1+6 type steel cord according to claim 1, characterized in that: The core wire wavelength is S1, and the surface wire wavelength is S2, satisfying 2mm≤S1≤4mm and 0.2mm≤S1-S2≤2mm.

8. The high-permeability adhesive 1+6 type steel cord according to claim 1, characterized in that: The core wire has a wave height of H1 and the face wire has a wave height of H2, satisfying 0.10mm≤H1≤0.20mm, 0.05mm≤H2≤0.15mm and 1.2≤H1 / H2≤2.

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