CS257785B2 - Stritch-bonded fabric for fireproof conveyer belts - Google Patents

Abstract

Nähwirkstoff für Umlegearbieten für schwer brennbare Gummi- oder PVC-Bänder, der so konstruiert ist, dass seine Oberfläche eine faserige Schicht darstellt und zwei grundsätzliche Anordnungen von Garnen, bevorzugt mit einem Kern mit einem niedrigen thermischen Krumpfen, beständig mittels Fäden aus synthetischer Seide oder einem Zwirn, vorteilhafterweise mit einem niedrigen thermischen Krumpfen, verbunden sind.

Der Nähwirkstoff dient zur Herstellung von Förderbändern, hauptsächlich für PVC-Förderbänder, welche für den Grubenbergbau bestimmt sind.

Description

FIELD OF THE INVENTION The present invention relates to an interlock for fire resistant conveyor belts, particularly for mining, whose construction and structure provides high tear resistance and tensile strength, high adhesion to plastics such as PVC or rubber, increased fire resistance and above all minimal ductility, as well as high fatigue limit and increased puncture resistance.

From Polish Patent Specification No. 114 424, a fabric lining for fireproof conveyor belts is known which exhibits increased fire resistance and adhesion to coating materials compared to traditional fabrics.

There, the fire resistance as well as the adhesion to the coating materials was improved by introducing staple viscose fibers in an average amount of about 32% relative to the fabric weight into the fabric structure.

The disadvantage of this fabric is the unfavorably high ductility, which causes an increase in ductility of the finished conveyor belts by more than 3% and a reduction in the fatigue limit measured by the number of bends. This causes a significant deterioration of the technical-utility parameters of the finished conveyor belts. Another drawback is the relatively complex production of fabrics intended for conveyor belt inserts, which requires adaptation and reinforcement of the individual elements of the looms to prevent their rapid wear, as well as laboriousness and low efficiency of the production process.

It is an object of the present invention to provide a cladding structure for fire resistant conveyor belts which, in addition to high tear resistance, high adhesion to plastics and rubber, increased fire resistance, and in particular higher puncture resistance, ensures minimal ductility and high resistance to repeated bending.

The aforementioned drawbacks are overcome and the object is solved by an interlock in which at least two sets of parallel arranged, aligned and unrelated yarns, preferably of low thermal shrinkage synthetic silk surrounded by a fiber layer, are permanently joined by synthetic silk threads, preferably low according to the invention, characterized in that the upper assembly is made of melange yarn of chemical fibers, preferably a core yarn of low thermal shrinkage, consisting of several partial yarns joined by feeding on the yarn 500 to 1100 tex, while the bottom assembly is made of man-made melange yarn, preferably a low-shrinkage core yarn, single or twisted, of 100 to 500 tex.

The bonding bonding structure is a synthetic silk or twisted yarn of 40 to 200 tex, preferably having low thermal shrinkage, the number of bonding bonding points per cm ^{2 of the} surface of the article being 4 to 20.

In the interlock according to the invention, the strength associated with the lining, i.e. the stratification resistance, is increased by about 30% compared to solutions in which the fabric is used to make the lining.

The fatigue limit of ready-made interlining conveyor belts, measured by the number of bends, increases approximately 5 times compared to fabric belts.

When using the inventive entanglement, the relative elongation of the web reaches a value of up to 3% and is approximately 30% lower than that of a web with a fabric insert.

The flammability indicator, measured by the extinguishing time of the finished conveyor belt made with the lined interweaving of the invention, is 2.5 seconds and is approximately 1 second shorter than that of a conveyor belt with a fabric refractory liner.

Example

The upper assembly is formed of 270 x 3 tex melange yarn, while the lower assembly is 150 x 1 tex melange yarn. Suitably, a core yarn of low thermal shrinkage is used, which is a yarn that changes its length by a maximum of 5% when handled at 160 ° C for 3 minutes. The joint is made of synthetic silk 940 dtex, with low shrinkage. The densification of the yarn formations to 1 dm, i.e. the number of fibers per 1 dm, is 60 to 120, preferably 84 ± 3 for the upper assembly, 150 to 200, preferably 162 ± 8 for the lower assembly, and 20 to 40, preferably The tensile force in the longitudinal direction is in the range from 250 to 500 daN / cm, at 84 fibers per dm about 300 daN, in the transverse direction the tearing force is in the range from 80 to 200 daN / cm, 162 fibers per dm is about 110 daN.

The elongation in the longitudinal direction is not more than 35% and the elongation in the transverse direction is not more than 30%.

Claims (1)

OBJECT OF THE INVENTION An interlock for fire-resistant conveyor belts, characterized in that its surface is a fibrous layer and comprises two sets of yarns, preferably yarns of low thermal shrinkage core, stably bonded by synthetic silk yarns, or of 40 to 200 tex yarns of low thermal shrinkage at a number of bonding points per cm ^{2 of} surface area from 4 to 20, wherein the top assembly is formed from individual partial yarns 500 to 1100 tex, joined by infeed, and the bottom assembly is from single or twisted yarn 100 to 500 tex.