RU2202014C2 - Duck fabric for polymeric covering - Google Patents

Abstract

FIELD: textile industry. SUBSTANCE: duck fabric comprises synthetic warp and weft threads made by rib weaving and base coverings fixed by means of cloth. Warp pattern repeat has even number of threads not less than 6 arranged at interval of 4 to define two face and reverse halves of pattern repeat having equal odd number of threads of at least 3. Within each half of pattern repeat, face warp threads are interlaced with weft threads in accordance with following mathematical dependence: 0,5 R_y/1+1/1(0,25 R_y-0,5), where R_y is weft pattern repeat. Long weft coverings overlap odd number of weft threads of at least 3, and respective warp threads of face and reverse halves of pattern repeat are interlaced out of phase one with respect to another to form in weft reverse mirror axis of symmetry with respect to longitudinal axis. Two groups of alternating warp threads formed in each half of pattern repeat are interlaced with one another in similar manner and offset with respect to one another along warp by number of threads equal to half the weft pattern repeat, with number of warp threads interlacing with one another in similar manner in each group of pattern repeat is equal to: (0.25 Ro+0.5) and (0.25 Ro-0.5), where Ro is warp pattern repeat. Fabric has improved rupture strength. EFFECT: increased efficiency and improved quality of fabric and, accordingly, polymeric covering. 2 cl, 9 dwg, 2 tbl

Description

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

 The main technical requirements for polymer coated fabrics used as a reinforcing traction frame for snowmobile caterpillars and multi-laying conveyor belts are minimum (not more than 4.5%) deformation elongations in the range of workloads (10% of bursting), providing traction elongation snowmobiles by an amount not exceeding the course of the tensioning devices or reducing to a minimum (no more than 3) the number of inevitable processes of refueling conveyor belts during their operation and eduyuschego drawing; sufficient (not less than 4.5 kgf / cm) bond strength of the surface of the frame with the elastomeric material, eliminating the delamination of the pads of the reinforcing frame. In addition, to exclude the extension of warp and weft threads during the technological processing of the fabric under the polymer, they must have a high coefficient of thread bonding (at least 5.0).

 Known fabric TK-200-2, used as a reinforcing traction frame of tracks of snowmobiles "Buran", "Lynx", "Taiga" and multi-laying rubber conveyor belts. TK-200-2 fabric is formed by plain weaving of two systems of twisted synthetic mutually perpendicular yarns, with the base filling being 93.7-97.4%, weft filling 34.9-38.59, the ratio of the linear densities of warp and weft equal to 0.95-1.0, the ratio of technological densities on the basis and weft is 2.43-2.79 ["Technical polyamide fabrics for conveyor belts and flat drive belts" GOST 18215-87].

 The disadvantage of this technical fabric is significant deformation elongations in the area of workloads (5.0-7.0%), due to the high performance of the warp threads (16.6-19.4%), the change in the size of the fabric in hot air on the basis of up to ( 9.0 ± 2)%, which leads to elongation of the tracks by an amount exceeding the stroke of the tensioning devices, and makes completely serviceable tracks unsuitable for further operation. 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 frame of snowmobile caterpillars and multi-laying conveyor belts based on it.

 Also known is the fabric used as a traction frame for snowmobile caterpillars and multi-lay conveyor belts, made by half-layer weaving of synthetic threads, and formed by joining two 4-thread front and back satin weaves by alternating front and back main floors, united by a common duck 36 [patent 22 class B 29 D 29/00, D 03 D 1/00, B 65 G 15/30, 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.

 The closest in structure and achieved effect are scarf weave fabrics with fixed main or weft long floorings that overlap several, at least 4, threads of the opposite system in a row with the formation of convex scars on the one (front) side having longitudinal or transverse direction, and on the other (wrong side) there are main or weft floorings fixed in a certain pattern between the scars. Long flooring independently, as it were, is additionally fixed (bound) according to the law of plain (1/1) or twill (2/1 or 1/2) weaves. 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. [cm. book Kutepov O.S. The structure and design of fabrics, - M .: Legprombytizdat, 1988, p. 74-76].

 A disadvantage of the known scar tissue is the heterogeneity of the adhesion of the front and back sides of the surface to the elastomeric coating, due to the different in appearance and texture of the supporting surfaces. This makes them inapplicable as a reinforcing woven frame for polymer coating.

 An object of the invention is the creation of a double-faced cuff weave fabric under a polymer coating for a reinforcing traction frame of snowmobile caterpillars and multi-layered rubber conveyor belts with the same adhesion to rubber on both sides.

This problem is solved in that the technical fabric under the polymer coating is made with rib weave with the main coverings fixed with the canvas. 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 + 1/1 (0.25 R _y -0.5),
where R _y - weft repeat weft.

Long main floorings overlap an odd number of weft threads, at least 3, and the corresponding warp threads of the front and back half-rapports intertwine in antiphase to each other, forming a reverse “mirror” axis of symmetry with respect to the longitudinal axis along the weft. In each half-support, there are two groups of warp threads alternating through one equally spaced 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 0.25R _o +0, respectively , 5 and 0.25R _o -0.5, where R _o - rapport weave on the basis.

Each weft rapport along the warp yarn contains 2 full linen rapports, 0.5 R _y -1 identical half-rapport of weft rep 0.5 R _y / 0.5 R _y and 0.5 R _y -3 linen half rapport located in the intervals between rep half reports. The ratio of linear densities of warp and weft threads should be in the range of 1.8-4.0.

 If it is necessary to increase the porosity of the fabric, it is formed with gaps between half-rapport equal to 1-5 mm.

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

 The inventive structure allows to obtain a fabric with a minimum (not more than 4.0%) strain elongation in the range of working loads (10% of the bursting), sufficient (not less than 4.5 kgf / cm) bond strength of the fabric surface with an elastomeric material, high coefficient connectedness of threads (not less than 5.0). To increase the porosity of the tissue between each half-rapport, a gap of 1-5 mm is established on the basis.

 Figure 1-9 shows the possible variations of the weave patterns of the proposed fabric with rapports from 6x6 to 14x14.

 Figure 1, 2, 3 shows the patterns of weaving with rapport on the basis of 6 threads: 6x6; 6x10; 6x14.

 Figure 4, 5, 6 shows the patterns of weaving with rapport on the basis of 10 threads: 10x6; 10x10; 10x14.

 Figures 7, 8, 9 show weaving patterns with rapport based on 14 threads: 14x6; 14x10; 14x14.

 The proposed fabric is made of synthetic, preferably polyester or polyamide, threads on shuttle, micro-shuttle or rapier weaving looms equipped with a shed for 6 or more hems with weft repeat from 6 to 14. When dressing the fabric on the weaving machines, half of the rapport gets into the reed tooth - 3, 5, or 7 threads. If it is necessary to obtain tissue with gaps between the main half-rapport equal to 1-5 mm, the parting in the reed is carried out in a half-rapport into the reed tooth with a gap of 1 to 3 teeth, forming gaps between the front and back scar 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 given in table. 2.

 Prototypes of TL-190-MA 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 TLK-300-Y fabric was also tested with a positive result at the Moscow plant RTI - Rubber "in the manufacture of four-laying conveyor belts of the type" 2-SHTS ". According to the test results, fabrics TL-190-MA and TLK-300-I are recommended for industrial use. On the fabric of TL-190-MA and TLK-300-Y, the technical specifications of OAO NIITT TU 8378-25-00302379-2001 were agreed and approved.

Claims (2)

1. Technical fabric for a polymer coating containing synthetic warp and weft yarns, made by ribbed weaving with the main coverings fixed with a canvas, characterized in that the rapport on the base contains an even number of threads, at least 6 with an interval of 4, forming two half-rapports of the same number of threads - front and back with an odd number of threads, at least 3, while within each half-support, the facial warp threads are interwoven with weft threads according to the following mathematical relationship: 0.5 R _y / 1 + 1/1 (0.25 R _y -0 5) wherein R - repeat of the weave in the weft, the long main decking span an odd number of weft yarns of at least 3, and the corresponding warp yarns right and wrong polurapportov interwoven in opposite phase to each other forming weft inverse mirror symmetry axis relative to the longitudinal axis, each polurapporte on the basis there are two groups of equally interlacing warp threads alternating through one, shifted relative to each other along the warp by the number of threads equal to half the weft rapport, and the number is the same in intertwining warp yarns in each group are respectively equal polurapporta (0,25R _o +0,5) and (0,25R _o -0,5), where R _a - rapport warp weave repeat of weft along each of warp yarns contains 2 complete linen rapport, (0.5R _y -1) identical half-rapport of weft rep 0.5 R _y / 0.5 R _y and (0.5R _y -3) linen half rapport, located in the intervals between rep half-raps, while the ratio of linear densities of threads warp and weft is in the range of 1.8-4.0.  2. Technical fabric for polymer coating according to claim 1, characterized in that the alternating front and wrong main half-races are spaced from each other with a gap of 1-5 mm

Images