Influence of inter-layer diffusion of sulphur and RU-NP modifier on the bond strength between plies of a conveyor belt

摘要

It is known (refs. 1 and 2) that the diffusion of ingredients from one part to another in multi-ply rubber products reinforced with fibres or metal cord, such as cartyres, leads to a redistribution of the ingredients between the components and has an effect on he bond strength between them. The Russian company Kurskrezinotekhnika manufractures conveyor belts reinforced with TLK-200MA with polyester cord 111 tex x 4 as the warp and Kapron (polycaprolactam) cord 187 tex x 2 as the weft and Kapron (polycaprolactam) cord 187 tex x 4 as the warp and anide cord 93.5 tex x 4 as the weft. The polyester cords are treated during their manufacture to increase their affinity for latex resorcinol-formaldehyde adhesives (LRF) which are employed to bond the reinforcing fibres to the rubbers. Conveyor belts consist of three to six plies of LRF-impregnated TLK-200MA or TLA-200MA with an interply of rubber mix applied on both sides of each ply of fabric by means of a calender. These plies form the carcass, onto which is applied a rubber coating. After this the conveyor belts are vulcanised in a press.