RU2208669C2 - Polyester cord fabric for radial tire carcass - Google Patents

Abstract

FIELD: manufacture of duck fabric. SUBSTANCE: cord fabric comprises polyester warp threads and polyamide weft thread. Warp thread has equivalent or non-equivalent preliminary and final 250/250-510/470 twists/m depending on linear density of basic threads in single, double or triple folding. Density of fabric in warp is 75-160 threads per 10 cm. Weft thread has density of 20- 40 tex, failure elongation before impregnation and thermal processing of 200-300% and thread density of 6-15 threads per 10 cm. EFFECT: improved operating characteristics of polyester cord fabric. 2 cl, 2 dwg, 2 tbl

Description

 The invention relates to the production of technical fabrics and can be used for the production of textile reinforcing materials used in the tire industry for the manufacture of radial tire carcasses.

 Known polyester cord fabric for the carcass of radial tires, consisting of polyester warp threads with equal twists in the range 330 / 330-490 / 490 cr / m and a thread frequency of 90-140 threads per 10 cm and weft threads from a two-component cotton polyamide yarn with linear density 20-35 tex and tensile elongation ranging from 150 to 280% before impregnation and heat treatment [1].

 The disadvantage of polyester cord fabric is the low operational properties of radial tires due to the uneven arrangement of warp threads along the width of the fabric and subsequent processing until the structure is fixed in the stretched state when the fabric is “expanded” due to the uneven shrinkage of the weft cotton polyamide yarn during impregnation and heat treatment — after impregnation and heat treatment, elongation at a break <α = 165-210, while the density of the fabric on the base is 80-90 threads per 10 cm, and weft 25-35 threads per 10 cm, and the distance between the main threads was it is 0.1-0.5 of their diameter [2].

 The disadvantage of cord fabric is the low tensile elongation of 13-15% of weft yarns, which leads to a decrease in the operational properties of radial tires and to a decrease in their service life.

 The objective of the proposed technical solution is to increase the manufacturability of the production process of polyester cord fabric and the process of its processing, increase the operational characteristics and service life of radial tires.

 The problem is achieved in that the polyester cord fabric for the radial tire carcass consists of polyester warp and polyamide weft, and a warp with equivalent or unequal preliminary and final twists of 250 / 250-510 / 470 cr / m is used as the warp from the linear density of the starting yarns in one, two, or three additions, while the density of the base fabric is 75-160 yarns per 10 cm, and a weft yarn with a density of 20-40 tex, tensile elongation before impregnation and heat treatment is used as a weft yarn ki 200-300% and a thread frequency of 6-15 threads per 10 cm. The linear density of the starting warp threads is 111-454 tex.

 The combination of all of the above features allows you to get a uniform distribution of threads in the polyester cord fabric when it is stretched and uniform force and elongation during heat treatment, which provides a large width of the fabric after impregnation and heat treatment with more uniform properties.

 In FIG. 1 shows the degree of uniformity of the weft yarn of polyamide 6.6, which provides uniform force and elongation during heat treatment.

 In FIG. 2 shows the degree of uniformity and distribution of filaments in cord fabric when it is stretched with a single-component highly extensible weft yarn from polyamide 6.6.

Example. Polyester cord fabric for radial tire carcass
An experimental batch of polyester cord fabric 20 PDU was made at the Grodno Production Association Khimvolokno, consisting of warp threads — adhesive polyester thread with a linear density of 111 tex, 111 tex • 1 • 3 structure with a preliminary twist value of 333 cr / m in the non-impregnated fabric. As a weft thread, we used a one-component tensile continuous filament yarn of polyamide 6.6 with a linear density of 23.5 with an elongation at break of 270 ± 20% and a force of less than 3 cN at shrinkage at 240 ^{° C.} The warp threads were installed on the creel of the loom with the number of spools within 1372-1410 pcs. The metric number of the weaving loom is 44. The number of warp yarns is 94 ± 1 yarns, and weft 10 ± 1 yarns per 10 cm. The yarn was stitched together with a polyamide yarn of linear density of 15.6 • 3. The rubberized cord was tested in the carcass of tires a / p 175 / 70R-132 of model BI - 391. The bench and operational tests of polyester cord fabric 20 of the remote control are shown in Table 1.

 The density indicators of cord fabric 20 PDU based on are given in table 2.

Sources of information
1. Application 960548 A, dated February 19, 1996, bull. 3 (14), 1997

 2. Copyright certificate 1675427, 5 D 03 D 1/00, D 03 D 15/00, bull. 33.1991 g.

Claims (2)

 1. Polyester cord fabric for the carcass of radial tires, consisting of polyester warp and polyamide weft, characterized in that the warp with the same or unequal preliminary and final twists of 250 / 250-510 / 470 cr / m depending on from the linear density of the starting threads in one, two, or three additions, the density of the base fabric being 75-160 threads per 10 cm, and a thread with a density of 20-40 tex, tensile elongation before impregnation and heat treatment is used as a weft thread 200-300% and frequency strings 6-15 threads per 10 cm.  2. The fabric according to claim 1, characterized in that the linear density of the starting warp is 111-454 tex.

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