Roller factors: axial string momentum (directly affect the life of idler). Flexibility (impact idler life and the life of a polymer tape rollers, as well as the whole driving power). Waterproof (affecting roller life). Dustproof performance (impact idler life). Axial load carrying capacity (impact roller life). Impact resistance (impact idler life). Rotational resistance (affects tape life). Roller installation: roller assembly installed at the factory and on-site installation. Factory assembly factory high molecular idler roller type, which is generally the order: check bearing and seals, cleaning and oiling and housing inspection, cleaning and rust cylinder machining and welding, and then installed in a dedicated press On assembly, the assembly in accordance with the order from the inside out piece by piece press-fit.