The performance requirements of polyester fiber mainly include the following aspects:
1. Physical performance requirements
Linear density: The linear density of polyester fiber is an indicator of its thickness. Polyester fibers for different purposes need to have different linear densities to meet specific requirements.
Tensile strength and elongation at break: Polyester fiber should have high tensile strength and appropriate elongation at break to ensure that it is not easy to break when subjected to force and has a certain elasticity. For example, the strength of polyester fiber is 3 times that of cotton and 2 times that of nylon, and it has high wear resistance and tensile resistance.
Softness and elasticity: Polyester fiber should have good softness and elasticity to ensure that it is not easy to deform or wrinkle during use. The elasticity of polyester fiber is close to that of wool, and it can be almost completely recovered when stretched by 5% to 6%.
Hygroscopicity and permeability: Although polyester fiber has low hygroscopicity, it is still required to have a certain hygroscopicity and permeability in some applications. The hygroscopicity and air permeability of polyester fiber can be improved through modification.
2. Chemical performance requirements
Acid and alkali resistance: Polyester fiber should have good acid and alkali resistance and is not easily corroded by acid and alkali. This property enables polyester fiber to maintain stable performance in a variety of environments.
Heat resistance: Polyester fiber should have high heat resistance and can maintain stable performance at higher temperatures. The melting point of polyester fiber is usually lower than 255℃, but it can still maintain good stability and strength at high temperatures.
Weather resistance: Polyester fiber should have good weather resistance and is not easily affected by climatic conditions and deteriorated or damaged. This allows polyester fiber to maintain a long service life in outdoor environments.
3. Mechanical performance requirements
Fatigue resistance: Polyester fiber should have good fatigue resistance and can maintain stable performance under long-term stress.
Creep resistance: Polyester fiber should have a certain creep resistance to prevent deformation during use.
Seismic resistance: In some applications, polyester fiber needs to have good seismic resistance to cope with the impact of natural disasters such as earthquakes.
4. Other performance requirements
Environmental protection: The production process of polyester fiber should minimize pollution to the environment, and its waste should be easy to recycle.
Easy processing: Polyester fiber should be easy to process into various shapes and sizes to meet the needs of different fields.
Price: The price of polyester fiber should be moderate to meet the needs of different consumers.
In summary, the performance requirements of polyester fiber cover physical properties, chemical properties, mechanical properties and other requirements. These requirements together ensure the stability and reliability of polyester fiber in various applications.