RU2619922C2 - Biaxiisotropic industrial fabric for elastomer coating - Google Patents

Abstract

FIELD: textile.

SUBSTANCE: disclosed is biaxiisotropic industrial fabric for elastomer coating, made by double-layer weaving of identical in raw material composition and linear density warp and weft threads. Fabric is formed by connection of two identical four-ply by warp and weft double-layer weaves, containing by four warps threads arranged in pairs in two levels-layers and by four weft threads. Three of four weft threads (two interwoven with warp threads of only upper or lower layer are background and one if straight-filling) are located in one plane above each other. Fourth weft thread, rounding upper and lower layers warp threads in alternating order, connects them into two-layer weave. In obtained eight-thread repetition by warp two background weft threads of each level-layer are connected to each other, forming wavy branches arranged in two levels. Straight filling weft threads of each composite repeats are bending and serve as connective and dressing weft threads. Connectivity coefficient at fabric filling from 75 % to 100 % can be in range from 5.0 to 10. Proposed fabric can be used as elastomer coated mechanical articles reinforcing frame, preferably for ground vehicles and aircrafts “soft” fuel tanks production, middle and heavy series rubber-rope conveyor belts protective layer-breaker, rubber-fabric hoses and other industrial rubber articles.

EFFECT: proposed fabric without elastomer coating can be used for production of special protective clothes, body armor and armor plates, parts of shoes, industrial filters partitions for filtration of fluids and gas-air mixtures.

1 cl, 2 dwg, 1 tbl

Description

The invention relates to the textile industry and can be used as a reinforcing frame of technical products with an elastomeric coating, mainly for the manufacture of “soft” fuel tanks of land vehicles and aircraft, a protective layer - a belt of rubber and medium conveyor belts of heavy series, rubber-fabric sleeves and other rubber products. The proposed fabric without an elastomeric coating can be used for the manufacture of special protective clothing, body armor and armor plates, shoe parts, industrial filter partitions 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 5.0 and a breaking load on the base and weft of at least 150 kgf / cm.

Fabrics made of the same raw material composition and linear density of warp and weft threads are considered to be bi-isisotropic. These fabrics have close in magnitude (differing by no more than ± 15%) 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 impact 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-Р), 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 of the same raw materials composition, linear density of warp and weft, with the same rapport 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 ± 15%. 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 86-89% with a connection coefficient from 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 reinforcing frame of technical products with an elastomeric coating, including for the manufacture of “soft” fuel tanks of land vehicles and aircraft, protective linings of rubber-conveyor belts and other technical products, as plain weave fabrics having an optimal coefficient of connectivity are limited by a breaking load of 120 kgf / cm, if necessary not less than 150 kgf / cm, and fabrics with weave mat 2 / 2, 3/3, 4/4, having a sufficient breaking load from 120 to 400 kgf / cm, have an increased expansion due to a low, not more than 2.5, connection coefficient, if necessary not less than 5.0.

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. 190-191].

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 allows you to get in the finished product biaxyisotropic structure that equally perceives the load simultaneously in the directions of the 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.

In addition, a known 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 vice versa. 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. 250 333, according to cl. MKI ⁴ D03D 15/00, publ. 04/16/1987].

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 biaxyisotropic in structure, a reinforcing pad that equally perceives loads in the directions of warp and weft.

The closest in technical essence and the achieved result are technical fabrics made with a two-layer plain weave with the connection of layers of individual warp or weft. In this case, the dressings of warp or weft have the same working time with the same non-dressing threads [book: Kerimov SG, Popov L.N. "Production of technical fabrics." - M .: Legprombytizdat, 1994. Pp. 185-186].

However, this type of weaving has insufficient compactness and low density in the system of dressings and the resulting low coefficient of connectivity, not exceeding 4.5.

An object of the present invention is to provide a biaxisotropic technical fabric for an elastomeric coating with a breaking load on the base and weft of at least 150 kgf / cm and a connectivity coefficient of at least 5.0.

This problem is solved in that the biaxisotropic technical fabric for the elastomeric coating is made by two-layer weaving of the warp and weft threads of the same raw material composition and linear density. The fabric is formed by joining two identical four-strand warp and weft two-layer weaves containing four main threads, arranged in pairs in two layers, and four weft threads. Three of the four weft yarns (two warps with warp threads of only the upper or lower layers of the background and one straight-line-filler) are located in the same plane one above the other. The fourth weft thread, bending in alternating order the warp threads of the upper and lower layers, connects them into a two-layer weave. In the resulting eight-thread rapport, two background weft threads of each level-layer are connected to each other, forming wavy branches located at two levels. The rectilinear filling weft threads of each of the composite rapports in the adjacent rapport are bent and serve as connecting and dressing weft threads. The coefficient of connectivity when filling such a tissue from 75% to 100% can be in the range from 5.0 to 10.

In FIG. Figure 1 shows the pattern of weaving of the original two-layer fabric with four-thread weaving patterns of warp and weft and the pattern of arrangement of threads in the section of fabric along the weft threads combined with it.

In FIG. Figure 2 shows the full composite rapport of weaving of the proposed biaxyisotropic fabric and the pattern of arrangement of threads in the section of fabric along the weft threads combined with it.

In FIG. 1 and 2, the following conventions of threads are adopted: O ₁ ... O ₈ - warp threads with serial numbers from 1 to 8; At ₁ ... At ₄ - weft threads with serial numbers from 1 to 4.

The proposed fabric is made on micro-shuttle, shuttle or rapier looms equipped with 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.

These tables show that the claimed fabric in comparison with similar fabrics in terms of basic properties (biaxiisotropy, breaking load and cohesion coefficient) correspond to the intended purpose in the manufacture of technical rubber products.

Prototypes of fabrics of the claimed structure TPB-240-1 and TPB-240-2 with a positive result were tested at Moscow Scientific Research Institute of Elastomeric Materials and Products in the manufacture of various rubber products. According to the test results, these fabrics are recommended for industrial use in the production of “soft” fuel tanks of aircraft as a reinforcing frame. The technical specifications TU 8378-0067-00302379-2015 are compiled, agreed and approved on the proposed biaxisotropic tissues. "Polyamide biaxisotropic fabrics for elastomeric coating TPB-240-1 and TPB-240-2."

Claims (1)

Biaxisotropic technical fabric for an elastomeric coating, made by two-layer weaving of the warp and weft threads of the same raw material composition and linear density, characterized in that it is formed by joining two identical four-strand warp and weft of two-layer weaves containing four main threads, arranged in pairs in pairs two levels-layers, and four weft threads, of which two interwoven background and one rectilinear-filling are located in the same plane one above the other, and even The fourth weft thread, alternating around the warp threads of the upper and lower layers, connects them, while in the resulting eight-thread rapport based on the background, the weft threads of each level-layer are interconnected, forming wavy branches located at two levels, and the rectilinear filling weft threads each of the composite rapports bend and serve as connective dressing weft threads, while the coefficient of tissue connectivity can be in the range from 5.0 to 10.

Images