RU2233919C2 - Meshed fabric for polymer covering - Google Patents

Abstract

FIELD: textile industry, in particular, meshed fabric which may be used as reinforcing pulling carcass for technical articles with elastomer covering.

SUBSTANCE: meshed fabric for polymer covering has synthetic warp and weft threads and is made by ribbed weave with warp coverings fixed by 2/1 serge weave. Warp repeat pattern has even number of threads, at least 6, with interval 4, said threads forming two semi-repeated patterns, namely, face and reverse side semi-repeated patterns having equal odd number of threads, at least 3. Warp face threads are interlaced with weft threads within each semi-repeated pattern in accordance with following mathematical dependence: 0.5R_we/1+2/1*(0.5R_we-1)/3, where R_we is weft weave repeated pattern. Respective warp threads of face and reverse side semi-repeated patterns are interlaced in opposite phase with respect to one another to form reverse "mirror" axis of symmetry in weft with respect to longitudinal axis. Each semi-repeated warp pattern has two groups of alternating similarly interlacing warp threads offset from one another along warp by number of threads equal to half the warp repeated pattern, with number of similarly interlacing warp threads in each group of semi-repeated pattern being, respectively, equal to: (0.25R_wa +0.5) and (0.25R_wa-0.5), where R_wa is warp weave repeated pattern. Each weft repeated pattern has 2 full plain weave repeated patterns along warp threads, (0.5 R_we-1) similar semi-repeated patterns of weft repp 0.5R_we/0.5R_we and (0.5R_we-3) of plain weave semi-repeated patterns arranged in spaces between semi-repeated repp patterns. Linear density ratio of warp and weft threads is 1.8-4.1.

EFFECT: increased strength of fabric.

2 cl, 12 dwg, 2 tbl

Description

The invention relates to the textile industry and can be used as a reinforcing traction frame of technical products with a polymer coating, mainly multi-laying conveyor belts for transporting rock mass, flat drive belts and running tracks (tracks) of snowmobiles.

The main technical requirements for polymer coated fabrics used as a reinforcing traction frame for multi-lay conveyor belts, flat drive belts and snowmobile tracks are: high breaking load (from 65 to 300 kgf / cm) on the base, minimal (not more than 4.5 %) strain elongations in the range of workloads (10% of breaking), while the elongation of the tape should not exceed the stroke of the tensioning devices, sufficient (not less than 5.0 kgf / cm) bond strength of the frame surface with elas omernym pictures excluding bundle spacers reinforcing frame.

Known fabric TK-200-2, used as a reinforcing traction frame of multi-laying rubber-fabric conveyor belts, flat drive belts and tracks of snowmobiles "Buran", "Lynx", "Taiga". The TK-200-2 fabric is formed by plain weaving of twisted synthetic threads, with the base filling being 93.7-97.4%, weft filling 34.9-38.59, the linear density ratio of warp and weft is 0.95-1.0, the ratio of technological densities of warp and weft is 2.43-2.79, the work of warp threads is 16.6-19.4%, the elongation of the fabric in the range of workloads (10% of the breaking load) is 6.0 ± 1.0, and the technological shrinkage of the warp in hot air is 9.0 ± 2.0%. The adhesion of the fabric to rubber is 4.0-4.2 kgf / cm [“Technical polyamide fabrics for conveyor belts and flat drive belts” GOST 18215-87].

The disadvantage of this woven laying of the conveyor belt is significant elongation in the area of workloads (5.0-7.0%), due to the high rates of depletion of warp threads (16.6-19.4%), which leads to elongation of technical products by an amount exceeding the stroke of the tensioning devices. In addition, the insufficient degree of adhesion of the TK-200-2 fabric to rubber (4.0-4.2 kgf / cm) is the main reason for the delamination of the rubber fabric of conveyor belts, flat drive belts and snowmobile tracks based on it.

Also known is the fabric used as a traction frame for multi-laying conveyor belts, flat drive belts and snowmobile tracks, made by a half-layer weave of synthetic threads, formed by joining two 4-thread front and back satin weaves by alternating front and back main overlays [united by common duck overlays Germany No. 2436922 by class B 29 D 29/00, D 03 D 1/00, B 65 G 15/30, publ. 03/03/1977].

This fabric basically corresponds to its intended purpose according to the main indicators, however, it has a significant drawback - the extension of the threads during technological processing, due to the insufficient fastening of long floors and a low coefficient of bonding equal to 1.01.

In addition, scarlet weaving fabrics with fixed main or weft long decks are known that overlap several, at least 4, threads of the opposite system in succession with the formation of convex scars on one (front) side having a longitudinal or transverse direction, and on the other (wrong side) ) the parties have the main or weft flooring fixed in a certain pattern between the scars. Long floorings are independently, as it were, additionally fixed (bound) according to the law of plain (1/1) or twill (2/1 or 1/2) weaving. Each weave repeat consists of two scars located on the same front side of the fabric, the number of threads in which is a multiple of the fastening weave repeat. The basic rules for the construction of scar tissue are shown in table 1 [see book Kutepov O.S. “The structure and design of fabrics”, - M .: Legprombytizdat, 1988. Pp. 74-76].

However, the heterogeneity of adhesion of the front and back sides of the surface of the known scar tissue to the elastomeric coating is due to the unilateral location of the scars on the surface of these tissues, i.e. the presence of different in appearance and texture of the supporting surfaces, makes them inapplicable as a reinforcing woven frame for polymer coating.

The closest in structure and achieved effect is a cellular fabric with a tightness coefficient of 0.24-1.0, made by linen or twill 1/2, or 2/2 matting, or 4/4 matting, or translucent weaving of synthetic warp and weft threads with the formation of 0.01 mesh cells -3.5 mm [RF patent for the invention No. 2085636, D 03 D 15/00, 1/00, publ. August 27, 1999, July 27, 1997].

This cellular fabric cannot be used as a reinforcing traction frame of technical products with a polymer coating - multi-laying conveyor belts for transporting rock mass, flat drive belts and running tracks (tracks) of snowmobiles, as it has a breaking load on the base of not more than 60 kgf / cm with the required value from 65 to 300 kgf / cm.

An object of the invention is the creation of high-strength fabric under a polymer coating for a reinforcing traction frame of rubber fabric multi-laying conveyor belts, flat drive belts and tracks of snowmobiles with a high breaking load (from 65 to 300 kgf / cm) based on a minimum (not more than 4.5%) deformation elongation in the range of workloads, sufficient (not less than 5.0 kgf / cm) bond strength of the fabric surface with the elastomeric material.

This problem is solved in that the cellular fabric under the polymer coating with a density factor from 0.24 to 1.0 contains complex synthetic warp and weft threads, mutually arranged with the formation of cells, made by ribbed weaving with 2/1 main coverings fixed with twill. The base report contains an even number of threads, at least 6 with an interval of 4, forming two half-rapport of the same number of threads - front and wrong with an odd number of threads, at least 3. Within each half-rapport, the front warp threads are interwoven with weft threads according to the following mathematical dependence :

0.5 R _y / 1 + 2/1 · (0.5 R _y -1) / 3,

where R _y is the weft repeat pattern of 8 to 20 with an interval of 6. Corresponding warp threads of the front and back half-weaves are interwoven in antiphase to each other, forming the inverse “mirror” axis of symmetry with respect to the longitudinal axis of the weft. In each half-support, there are two groups of warp threads alternating through one equally interlaced warp threads, shifted relative to each other along the warp by the number of threads equal to half the weft rapport, and the number of equally interwoven warp threads in each half-rapport group is accordingly equal to:

0.25 R _o +0.5 and 0.25 R _o -0.5,

where R _o - rapport weave on the basis.

Each weft rapport along the warp contains 2 full linen rapports, (0.5 R _y -l) the same half-rapport weft rep 0.5 R _y / 0.5 R _y and (0.5 R _y -3) linen half rapport, located in between rep semi-reports.

Alternating facial and wrong main half-rapports of cellular tissue are spaced from each other with a gap of 1 to 5 mm.

In this case, the ratio of linear densities of warp and weft threads should be in the range of 1.8-4.1.

These distinctive features, each individually and all together, are aimed at solving the problem and are significant.

The inventive arrangement of warp and weft in the weave repeat allows you to get a fabric with a minimum (not more than 4.0%) strain elongation in the range of workloads (10% of the bursting), sufficient (not less than 4.5 kgf / cm) bond strength of the fabric surface with an elastomeric material , a high coefficient of bonding of fabric with an elastomeric material, a high coefficient of bonding of threads (not less than 5.0).

To increase the bond strength of the surface of the proposed fabric with an elastomer - rubber, a gap of 1 to 5 mm is established between each half-support on the basis of.

Figure 1-12 shows the possible options for weaving the proposed fabric with a rapport based on 6 to 18 threads with an interval of 4 and rapport on a weft from 8 to 20 threads with an interval of 6.

Figure 1-4 shows the weave patterns of the proposed fabric with rapports on the basis and weft equal to: 6 × 8; 10 × 8; 14 × 8; 18 × 8.

Figure 5-8 shows the weave patterns of the proposed fabric with rapports on the basis and weft equal to: 6 × 14; 10 × 14; 14 × 14; 18 × 14.

Figure 9-12 shows the weave patterns of the proposed fabric with rapports on the basis and weft equal to: 6 × 20; 10 × 20; 14 × 20; 18 × 20.

The proposed fabric is made from synthetic (polyester or polyamide) yarns on shuttle, micro shuttle or rapier weaving machines equipped with a shed for 4 or more hems with a weave pattern from 8 to 20. When dressing the fabric on weaving machines, half of the rapport gets into each tooth (3, 5, 7 or 9 threads on the basis).

The fabric is formed with gaps between half-rapport. To do this, the parting in the reed is performed in a half-way into the reed tooth with an admission of one to 3 teeth, forming gaps between the front and back scarred half-rapports.

To confirm the technical result of the invention, experimental fabrics of the proposed design were made. The main technical characteristics of analog fabrics and fabrics of the proposed structures are shown in table 2.

The data in table 2 show that the claimed fabric in comparison with analogous fabrics in terms of basic properties, elongation and adhesion surpasses known materials.

Prototypes of YATT-200 fabric with a positive result were tested at Yaroslavrezinotekhnika OJSC in the manufacture of rubber-fabric running tracks for the Buran and Taiga snowmobiles, and YATT-250 and YATT-300 fabrics were also tested with a positive result at the Moscow factory RTI - RUBBER ”in the manufacture of four-laying conveyor belts of the“ 2-SHTS ”type. According to the test results, fabrics YATT-200, YATT-250, YATT-300 are recommended for industrial use. On the fabric of YATT-200, YATT-250, YATT-300, the technical specifications of JSC “NIITT” TU 8378-035-00302379-2002 were developed, agreed and approved.

Claims (2)

1. A cellular fabric under a polymer coating containing synthetic warp and weft yarns, characterized in that it is made by ribbed weaving with 2/1 main sheeting fixed by twill, the rapport on the warp contains an even number of yarns, at least 6 with an interval of 4, forming two identical according to the number of half-rapport threads - front and back with an odd number of threads, at least 3, and within each half-rapport, the warp threads are interwoven with weft threads according to the following mathematical dependence: 0.5R _y / l + 2 / l · (0.5R _y- l) / 3, where R _y - weave repeat weft, in this case, the corresponding warp threads of the front and back half-rapports intertwine in antiphase to each other, forming a reverse “mirror” axis of symmetry along the longitudinal axis along the weft, and in each half-rapport on the warp there are two groups of warp warps alternating through the same weaving, shifted relative to each other along the warp by the number of threads equal to half the weft rapport, and the number of equally interwoven warp threads in each half-rapport group is respectively equal (0.25R ₀ +0.5) and (0.25R ₀ -0.5), where R ₀ - rapport weave on the basis each weft rapport along the warp contains 2 full linen rapports, (0.5 R _y -1) the same half rapport of the weft rep 0.5 R _y / 0.5R _y and (0.5 R _y -3) linen half rapport, located between semi-reporters, with the ratio of the linear densities of warp and weft being in the range of 1.8-4.1. 2. Cellular tissue under the polymer coating according to claim 1, characterized in that the alternating facial and wrong main half-races are spaced from each other with a gap of 1 to 5 mm.

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