Belts for conveyors; conveyor belts and belts for conveyors; conveyor belts and belts for conveyors of plastic, in particular of the following materials: polyurethane or polyester; conveyors; belts for machines; plastics welding machines; moulds for moulding plastics products (parts of machines); plastics moulding machines; machines for plastics working; robotic mechanisms for working plastic material; technical belts, namely flat belts, upright belts, v-belts and round belts (drive belts)