RU2259430C1 - Biaxiisotropic duck fabric for polymeric covering - Google Patents

Abstract

FIELD: fabric used as reinforcing carcass of technical articles with polymeric covering, preferably used as protective layer-breaker for rubberized cord of conveyor belts, rubberized sleeves and other technical articles.

SUBSTANCE: biaxiisotropic duck fabric is manufactured by double-layer weaving of warp and weft threads having similar composition of raw material and linear density of threads and similar pattern repeat of weavings in warp and weft. Fabric layers are connected with each other simultaneously by all warp and weft threads passing from layer to layer. In weaving pattern repeat, each warp and weft thread forms two long three-thread overlaps and two eight-thread single-thread overlaps. Any half the pattern of eight-thread weaving pattern repeat of 4x8 size or 8x4 size along warp and weft threads, after being turned to the right or to the left through right angle, coincides with respective half the pattern repeat of opposite thread system, and upon turning through 180° it coincides with pattern of second half of similar pattern of thread system, with fabric tenacity coefficient being within 3.0-10. Fabric produced has warp and weft rupture loading of at least 140 kgf/cm and tenacity coefficient of at least 3.0.

EFFECT: improved quality and wider range of duck fabrics.

1 dwg, 1 tbl

Description

The invention relates to the textile industry and can be used as a reinforcing strip of technical products with a polymer coating, mainly as a protective layer - a belt of rubber-conveyor conveyor belts of medium and heavy series, rubber-fabric sleeves and other rubber products. The proposed fabric without a polymer coating can be used for the manufacture of special protective sportswear for fencers, body armor and armored plates, shoe parts, filter baffles of industrial filters for filtering liquids and air masses.

The main attribute of technical fabrics, ensuring their compliance with the intended purpose in the above technical products, is the biaxiisotropy of their structure with a connection coefficient of at least 3.0 and a breaking load of the warp and weft of at least 140 kgf / cm.

Fabrics made of the same in raw material composition and linear density of warp and weft threads with the same repeat patterns of warp and weft are considered to be bi-isisotropic. These fabrics, as a rule, have close in magnitude (differing by no more than ± 18%) or equal indicators of physical and mechanical properties and structural and geometric parameters of the structure in the directions of warp and weft. Such a structure of biaxisotropic tissues is caused by the need to perceive during their operation the effect of the same or close in magnitude workloads simultaneously in the direction of the warp and weft.

Known single-layer biaxyisotropic fabrics of the TK-R series: TK-50-R, TK-80-R, TK-120-R, TK-120-R-1, TK-160-R-1, TK-270-R, TK -400-P, used for the manufacture of flexible rubber-fabric fencing of hovercraft and other rubber products, made by weaving a cloth (1/1), matting 2/2, matting 3/3 and matting 4/4 from the same raw material composition, linear the density of warp and weft threads, with the same repeat patterns of weave on the warp and weft. Technological densities of these fabrics on the basis and weft are equal or close to each other with deviations of ± 18%. The degree of filling on the basis of fabrics of the TK-R series of plain weave is 46-65%, with a connectivity coefficient ranging from 5.25 to 7.88. The degree of filling on the basis of fabrics of the TK-R series with matting weaves (2/2, 3/3, 4/4) is 86-119%, with a connection coefficient of 1.3 to 2.47 [OST R 17 15-004- 93 "Technical polyamide fabrics for flexible fencing" (instead of GOST 23114-78)].

Single-layer biaxisotropic fabrics of the TK-R series cannot be used as a protective liner for rubber-conveyor conveyor belts and other technical products, since plain weave fabrics having an optimal coupling coefficient are limited by a breaking load of 120 kgf / cm, if necessary not less than 140 kgf / cm, and fabrics with weave matting 2/2, 3/3, 4/4, having a sufficient breaking load from 120 to 400 kgf / cm, have an increased extension due to a low, not more than 2.5, connection coefficient, if necessary notless than 3.0.

Also known is a two-layer fabric TK-500-R, used as a reinforcing frame of flexible fencing, made of the same raw material composition and linear density of warp and weft weave 4/4 matting two-layer. The layers in this fabric are joined by part of the weft threads in order 2 through 2, the rapport on the warp is 32, the rapport on the warp is 16. The degree of filling of the fabric on the warp in two layers is 195%, with a connectivity coefficient of 6.25 [TU VNIITT 153-82 "Kapron fabric TK-500-R for flexible fencing", book: Kerimov SG, Popov L.N. Production of technical fabrics. - M .: Legprombytizdat, 1994, pp. 190-91].

The main disadvantage of the two-layer fabric TK-500-R, even with its high breaking load (at least 500 kgf / cm) and a sufficient coefficient of connectivity (6.25), is the heterogeneity of its structural and geometric parameters of the structure in the direction of the warp and weft, which is not will make it possible to obtain a gasket biaxisotropic in structure in the finished product that equally accepts loads simultaneously in the directions of warp and weft. In addition, the fabric is not technologically advanced due to the large rapport on the basis of (32) and weft (16), which requires special weaving equipment for its manufacture.

The closest in technical essence and the achieved result is a technical fabric for the manufacture of layered rubber products, made by a two-layer plain weave, the layers of which are connected by all warp threads passing from the upper layer to the lower and back. Each weave element contains two paired weft threads. The rapport of the fabric on the basis is 4 threads, and for the weft 8 or 16 threads [Copyright certificate of Czechoslovakia No. 250333, class. MKI ⁴ D 03 D 15/00, publ. 04/16/1987 g].

This fabric basically corresponds to the intended purpose in terms of physical and mechanical properties, however, it has a significant drawback - the presence of differently interwoven warp and weft threads in it, which even if the tensile loads of the warp and weft are equal in severity will not make it possible to obtain a baxaxisotropic structure in the finished product a gasket that equally accepts loads in the warp and weft directions.

An object of the present invention is to provide a biaxisotropic technical fabric for a polymer coating with a breaking load on the base and weft of at least 140 kgf / cm and a bond coefficient of at least 3.0.

This problem is solved in that the biaxisotropic technical fabric for the polymer coating is made by two-layer weaving of the warp and weft threads of the same raw material composition and linear density with the same weft and warp weaves. Layers of fabric are interconnected at the same time by all warp and weft threads passing from layer to layer. In the weave pattern, each warp and weft forms two long three-strand and two short one-strand overlaps, while any half of the eight-thread pattern of weaving 4 × 8 or 8 × 4 along the warp and weft threads is rotated 90 degrees to the right or left °, coincides with the corresponding half of the rapport of the opposite system of threads, and when it is rotated 180 ° - will coincide with the pattern of the second half of the rapport of the same system of threads. The coefficient of tissue connectivity ranges from 3 to 10.

The drawing shows a drawing of a complete rapport of weaving a biaxisotropic fabric with the patterns of arrangement of threads in sections of the fabric along the warp and weft threads combined with it.

In the drawing, the following conventions of the threads are adopted: O ₁ ... O ₈ - warp threads with serial numbers from 1 to 8; At ₁ ... At ₈ - weft threads with serial numbers from 1 to 8.

The proposed fabric is made on micro-shuttle, shuttle or rapier looms equipped with eight-turn eccentric mechanisms or shedding carriages.

To confirm the technical result of the invention, experimental fabrics of the proposed design were made. The main technical characteristics of the fabrics of the proposed structures are given in the table.

The data in the table show that the claimed fabric in comparison with similar fabrics in terms of basic properties - biaxyisotropy, breaking load and cohesion coefficient are more consistent with the intended purpose in the manufacture of medium and heavy series rubber conveyor belts.

Prototypes of fabrics of the claimed structure TPB-150/150, TPB-200/200, TPB-300/300, TPB-400/400, TPB-500/500 with a positive result were tested at Kurskrezinotekhnika OJSC in the manufacture of medium and medium rubber conveyor belts heavy series. According to the test results, these fabrics are recommended for industrial use.

Table Examples of specific performance of the claimed tissue biaxisotropic structures The name of indicators Numbers of dressings (options) of the claimed fabrics 1 2 3 4 5 Fabric brand TPB 150/150 TPB 200/200 TPB 300/300 TPB 400/400 TPB 500/500 Surface density, g / m ² 640 864 1287 1680 1975 Width mm 1350 1320 1250 1250 1200 Thickness mm 1.81 2.03 2.40 2.72 3.04 The number of threads per 10 cm: based 154 138 154 165 172 by duck 158 142 158 168 176 Breaking load of a strip of fabric measuring 50 × 200 mm, kgf: based 1610 2170 3230 4320 5410 by duck 1660 2240 3320 4410 5540 Elongation at break of a strip of fabric measuring 50 × 200 mm,%: based 32 33 34 36 38 by duck 34 35 36 37 39 Changing the size of the fabric in hot air at a temperature of 150 ° C and holding for 30 minutes,%: based 7.5 7.8 7.6 7.9 8.2 by duck 7.6 7.7 7.8 8.0 8.4 Tissue cohesion coefficient 3.03 3.4 5.35 7.59 9.95 The density factor of the fabric on the basis of 0.50 0.55 0.71 0.85 0.96 The raw material composition of warp and weft threads Polyamide thread (kapron) of high strength for rubber products The linear density of warp and weft threads, tex 93.5 × 2 93.5 × 3 187 × 2 93.5 × 5 187 × 3 Type of weaving Two-layer with dressing of layers simultaneously with all warp and weft threads Notes. Abbreviated designation of tissue structures: TPB - polyamide belt fabric; 150/150, 200/200, 300/300, 400/400, 500/500 - nominal tensile load of the fabric on the basis and weft, kgf / cm.

Claims (1)

Biaxisotropic technical fabric for a polymer coating, made by two-layer weaving of the warp and weft threads of the same raw material composition and linear density with the same weft and weft patterns, characterized in that the layers of fabric are connected together by all warp and weft threads passing from the layer each layer of warp and weft forms two long three-strand and two short single-strand floors, each half of the pattern of eight-strand rappo mouth weave size 4 × 8 or 8 × 4 along the warp and weft threads, being turned to the right or left by an angle of 90 °, coincides with the corresponding half of the rapport of the opposite system of threads, and when it is rotated 180 ° - coincides with the pattern of the second half of the rapport of the same name thread system, while the coefficient of tissue connectivity is in the range from 3.0 to 10.