the mechanical properties of artificial grass fibers

After raw material preparation, the next key step is melt extrusion, which is the process of converting solid raw materials into molten fibers. First, the mixed raw materials are put into the hopper of the extruder and heated evenly through the barrel of the extruder. The temperature control during extrusion is a core technical point: the temperature of the feeding section is usually 150-170℃, the melting section is 170-190℃, and the homogenizing section is 180-200℃. Too high temperature will cause the raw materials to decompose, resulting in discoloration and brittleness of the fibers; too low temperature will lead to incomplete melting, affecting the uniformity of the fiber diameter. The extruder screw speed also needs precise control (30-60 rpm), which is closely related to the output and fineness of the fibers. The molten raw materials are extruded through the spinneret with small holes, forming primary fibers with uniform diameter.

Stretching is another critical step to improve the mechanical properties of artificial grass fibers. The primary fibers extruded from the spinneret are in a molten state and have low strength, so they need to be stretched to rearrange the molecular chains of the polymer, thereby improving the tensile strength and elasticity of the fibers. Stretching is usually carried out in a hot stretching oven, and the stretching temperature (80-120℃) and stretching ratio (3-5 times) are the key technical points. The stretching temperature should be lower than the melting point of the raw materials but high enough to make the molecular chains move; the stretching ratio directly affects the strength and elongation at break of the fibers. If the stretching ratio is too small, the fiber strength is insufficient; if it is too large, the fiber is brittle and easy to break. After stretching, the fibers need to be cooled quickly (using air cooling or water cooling) to fix the molecular chain structure and maintain the fiber shape.

After stretching, the fibers enter the shaping and texturing process, which is designed to improve the simulation and anti-slip performance of the artificial grass fibers.