| 摘要 |
PURPOSE:To improve durability and fatigue-proof property of a toothed belt by making weft and/or wrap of the cloth, which is covering the surface of a tooth face, of the compound fiber composed of polyethylene-2,6-naphthalate core component and polyamide sheath component. CONSTITUTION:Wrap and weft, which is nealy in parallel with the longitudinal direction of a belt, of the cloth covering the surface of a toothed surface is made of the core and sheath type compound fiber composed of polyethylene-2,6- naphthalate core component, which is mainly composed of ethylene naphthalane-2,6-dicarboxilate, and sheath component, which is mainly composed of polyamide, surrounding the periphery of the core component. A limit viscosity (eta) of 2,6-PEN fiber of the core component for getting the strength more than 7.0g/d of the compound fiber is a high viscosity more than 0.5, and a ratio of the core component is 30-90weight%, and the polyamide sheath component needs a high polymerization degree, and a relative viscosity with sulfuric acid is more than 2.8, and copper salt and other organic and non-organic compound are added as the thermal oxidation and deterioration inhibitor. |
