RO116794B1 - Polyamide cord meshwork for pneumatic tyres - Google Patents

Abstract

The invention relates to a polyamide cord meshwork for tyres, comprising polyamide yarn with the initially spun filament denier of 3050 plus/minus 50 denier to obtain 700/105 dtex x 1 yarn; swirling of 380 ... 420 rounds per meter to the direction Z, which is then twisted to the direction S, of which the polyamide cord meshwork is woven, said meshwork having the weft count of 100 ... 115/10 cm; number of picks of 6 ... 8 yarns/10 cm; the cable diameter of 0.40 ... 0.50 mm for the 700/105 dtex x 3 cord meshwork.

Description

The invention relates to a polyamide cord network, usable in the manufacture of carcasses, tires, in diagonal or radial construction.

There are known progressively improvements to the cord networks, used in the manufacture of pneumatic tire carcasses, in the sense that the constantly improving physical-mechanical indicators have made it possible to reduce the number of layers effectively, to ensure the same resistance required by the class. tire.

Known according to RO 87057 patent, polyamide cord networks (1890/2) 2100 dtex x 2, having the denier title of 4342, the torsion of 320-330 / 330 ... 339 rpm / m; the sowing in the warp of 66 ... 87 threads / 10 cm, in the fabric of 6 ... 8 threads / 10 cm, made of polyamide yarns, used in the manufacture of the carcass for tires of trucks, vans and agricultural machinery in diagonal construction.

There are also known the cord networks, according to RO 86957, from which the casing of the tires having the denier title of 1035 ... 1050 is executed, the torsion of 220 ± 2 rpm / m in the S direction, the seam in the warp of 130 threads / 10 cm; in 12-wire / 10 cm fabric.

The problem solved by the invention is to realize a new construction of polyamide cord network, for tires, which have superior physical-mechanical indicators, for diagonal or radial pneumatic tires.

The polyamide cord network, for polyamide tires, according to the invention, consists of polyamide yarns, having the initial title of 3050 ± 50 denier to obtain the 700/105 dtex x 1 thread; the torsion of 380 ... 420 rpm / m, in the S direction, obtaining the simple wire of 800 ± 50 dtex χ 1, which is then twisted in the S direction, from which the polyamide cord network is woven with a warp of 100 ... 115 threads / 10 cm; in fabric of 6 ... 8 threads / 10 cm; cable diameter of 0.40 ... 0.50 mm for cord network 700/105 dtex χ 3.

By applying the invention, the following advantages are obtained:

- improvement of physical-mechanical indicators;

- increasing the productivity of the work, by reducing the number of torsions, increasing the cutting speed and by reducing the speed at spindles, (at the cord network manufacturer);

- the reduction of the specific consumption at the welding wire;

- Reduction of wear and tear at the plant for obtaining cord networks by reducing speeds at spindles;

- reducing the use of cord network on tires;

- reducing fuel consumption in rolling stock;

- the reduction of the labor force on products.

The following is an example of an embodiment of the invention.

The polyamide cord network, for pneumatic tires, according to the invention, is made up of spun polyamide yarns, having the initial spinning title of 3050 + 50 denier, which is stretched on a stretching machine, itself known, where it is stretched, cold and at warm, at a temperature of 187 ° C ± 3, obtaining the simple stretched wire of 700 dtex χ 1. The obtained strands are individually inserted on a spindle to be twisted in the Z direction with the torsion of 300 rpm. To make a three-wire cable, they are wound on the same format, with parallel winding, obtaining the wire 700/105 dtex χ 3, with the torsion of 390 rpm / m, in the Z direction. The wires thus wired are introduced in the phase of the final twist being twisted and balanced in the S direction with the torsion of 390 rpm /, which is wound in the form of a cross on cylindrical tubes.

RO 116794 Bl

The spools with the thread thus prepared are loaded on some strands and pierced to be woven. By weaving, the polyamide cord network having a width of 152O ± 2O mm is obtained; the seam in the warp of 115 threads / 10 cm; in fabric of 6 ... 8 threads / 10 cm; cable diameter 0.45 mm for cord network 700/105 dtex x 3. 50

For fabric we can use carded cotton yarn (Nm 34/1) with a density of 300 dtex length (Nm 34/1) with a density of 300 dtex length or acrylic cotton yarn with a density of 300 dtex length or acrylic yarn type cotton with a density of 300 dtex length (Nm 34/1).

The polyamide cord network obtained presents the following physico-medical indicators;

- 700/105 dtex x 3 cord network

- Breaking load (kgf)

- Elongation at break (%)

- Density at length (dtex)

- Thermostability (%)

- Torsion (rpm)

- Concentration at 100 ° C min. 15 daN

26 + 3

2325 ± 50 60 min. 80

400 + 20 max. 10

The cord network thus obtained is impregnated with an impregnation solution based on 65 natural and / or synthetic latex and a resin of 3 ... 8 with respect to the weight of the cable. The impregnated cord network is subjected to the gum operation with a known rubber composition itself, at a thickness that ensures at the tire equator a ratio between the distance between two cables and the cable diameter of 1.20mm.

The impregnated and gum cord network is cut at different widths and angles, depending on the construction, size and destination of the tires. The number of cord network layers that make up the tire casing also varies depending on the construction, size and destination of the tires.

Claim

Claims (1)

Polyamide cord network, for pneumatic tires, characterized in that, in order to improve the physical-mechanical indicators, the increase of labor productivity in the process of manufacturing cord networks, to reduce the specific consumption of raw materials in tires, is made of polyamide threads, having the initial spinning title 8o of 3050 + 50 denier, from which the simple wire is obtained, followed by a twist in the S direction with the torsion of 380 ... 410 rpm / m, from which the cord network with a tenth of 100 is woven. . 115fire / 10 cm in warp; in fabric of 6 ... 10 threads / 10 cm; cable diameter of 0.40 ... 0.50 mm for cord network 700/105 dtex x 3.